0 files changed, 0 insertions, 0 deletions
diff --git a/.appveyor.yml b/.appveyor.yml
deleted file mode 100644
index c8bf89e0d6..0000000000
--- a/.appveyor.yml
+++ /dev/null
@@ -1,134 +0,0 @@
----
-version: '{build}'
-init:
-  - git config --global user.name git
-  - git config --global user.email svn-admin@ruby-lang.org
-  - git config --global core.autocrlf false
-  - git config --global core.eol lf
-  - git config --global advice.detachedHead 0
-shallow_clone: true
-clone_depth: 10
-platform:
-  - x64
-skip_commits:
-  message: /^\[DOC\]/
-  files:
-    - doc/*
-    - '**/*.md'
-    - '**/*.rdoc'
-environment:
-  ruby_version: "24-%Platform%"
-  zlib_version: "1.2.12"
-  matrix:
-    - build: vs
-      vs: 120
-      ssl: OpenSSL
-      APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2015
-      GEMS_FOR_TEST: ""
-    - build: vs
-      vs: 140
-      ssl: OpenSSL-v111
-      APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2015
-      GEMS_FOR_TEST: ""
-  RELINE_TEST_ENCODING: "UTF-8"
-cache:
-  - c:\Tools\vcpkg\installed\
-for:
--
-  matrix:
-    only:
-      - build: vs
-  install:
-    - ver
-    - chcp
-    - SET BITS=%Platform:x86=32%
-    - SET BITS=%BITS:x=%
-    - SET OPENSSL_DIR=C:\%ssl%-Win%BITS%
-    - cd C:\Tools\vcpkg
-    - git pull -q
-    - .\bootstrap-vcpkg.bat
-    - cd %APPVEYOR_BUILD_FOLDER%
-    - vcpkg --triplet %Platform%-windows install libffi libyaml readline zlib
-    - CALL SET vcvars=%%^VS%VS%COMNTOOLS^%%..\..\VC\vcvarsall.bat
-    - SET vcvars
-    - '"%vcvars%" %Platform:x64=amd64%'
-    - SET ruby_path=C:\Ruby%ruby_version:-x86=%
-    - SET PATH=\usr\local\bin;%ruby_path%\bin;%PATH%;C:\msys64\mingw64\bin;C:\msys64\usr\bin
-    - ruby --version
-    - 'cl'
-    - echo> Makefile srcdir=.
-    - echo>> Makefile MSC_VER=0
-    - echo>> Makefile RT=none
-    - echo>> Makefile RT_VER=0
-    - echo>> Makefile BUILTIN_ENCOBJS=nul
-    - type win32\Makefile.sub >> Makefile
-    - nmake %mflags% up VCSUP="echo Update OK"
-    - nmake %mflags% extract-extlibs
-    - del Makefile
-    - mkdir \usr\local\bin
-    - mkdir \usr\local\include
-    - mkdir \usr\local\lib
-    - SET ZLIB_ZIP=.downloaded-cache\zlib%zlib_version:.=%.zip
-    - if not exist %ZLIB_ZIP% curl -fsSL -o %ZLIB_ZIP% --retry 10 https://zlib.net/zlib%zlib_version:.=%.zip
-    - 7z x -aos -o%APPVEYOR_BUILD_FOLDER%\ext\zlib %ZLIB_ZIP%
-    - for %%I in (%OPENSSL_DIR%\*.dll) do mklink /h \usr\local\bin\%%~nxI %%I
-    - for %%I in (c:\Tools\vcpkg\installed\%Platform%-windows\bin\*.dll) do (
-        if not %%~nI == readline mklink \usr\local\bin\%%~nxI %%I
-      )
-    - attrib +r /s /d
-    - mkdir %Platform%-mswin_%vs%
-  build_script:
-    - cd %APPVEYOR_BUILD_FOLDER%
-    - cd %Platform%-mswin_%vs%
-    - >-
-      ..\win32\configure.bat
-      --with-opt-dir="/usr/local;c:/Tools/vcpkg/installed/%Platform%-windows"
-      --with-openssl-dir=%OPENSSL_DIR:\=/%
-    - nmake -l
-    - nmake install-nodoc
-    - \usr\bin\ruby -v -e "p :locale => Encoding.find('locale'), :filesystem => Encoding.find('filesystem')"
-    - if not "%GEMS_FOR_TEST%" == "" \usr\bin\gem install --no-document %GEMS_FOR_TEST%
-    - \usr\bin\ruby -ropenssl -e "puts 'Build    ' + OpenSSL::OPENSSL_VERSION, 'Runtime  ' + OpenSSL::OPENSSL_LIBRARY_VERSION"
-  test_script:
-    - set /a JOBS=%NUMBER_OF_PROCESSORS%
-    - nmake -l "TESTOPTS=-v -q" btest
-    - nmake -l "TESTOPTS=-v -q" test-basic
-    - >-
-      nmake -l "TESTOPTS=-v --timeout-scale=3.0
-      --excludes=../test/excludes/_appveyor -j%JOBS%
-      --exclude win32ole
-      --exclude test_bignum
-      --exclude test_syntax
-      --exclude test_open-uri
-      --exclude test_bundled_ca
-      " test-all
-    # separately execute tests without -j which may crash worker with -j.
-    - >-
-      nmake -l
-      "TESTOPTS=-v --timeout-scale=3.0 --excludes=../test/excludes/_appveyor"
-      TESTS="
-      ../test/win32ole
-      ../test/ruby/test_bignum.rb
-      ../test/ruby/test_syntax.rb
-      ../test/open-uri/test_open-uri.rb
-      ../test/rubygems/test_bundled_ca.rb
-      " test-all
-    - nmake -l test-spec MSPECOPT=-fs # not using `-j` because sometimes `mspec -j` silently dies on Windows
-notifications:
-  - provider: Webhook
-    method: POST
-    url:
-      secure: CcFlJNDJ/a6to7u3Z4Fnz6dScEPNx7hTha2GkSRlV+1U6dqmxY/7uBcLXYb9gR3jfQk6w+2o/HrjNAyXMNGU/JOka3s2WRI4VKitzM+lQ08owvJIh0R7LxrGH0J2e81U # ruby-lang slack: ruby/simpler-alerts-bot
-    body: >-
-      {{^isPullRequest}}
-        {
-          "ci": "AppVeyor CI",
-          "env": "Visual Studio 2013 / 2015",
-          "url": "{{buildUrl}}",
-          "commit": "{{commitId}}",
-          "branch": "{{branch}}"
-        }
-      {{/isPullRequest}}
-    on_build_success: false
-    on_build_failure: true
-    on_build_status_changed: false
diff --git a/.cirrus.yml b/.cirrus.yml
deleted file mode 100644
index 0cab0023c2..0000000000
--- a/.cirrus.yml
+++ /dev/null
@@ -1,64 +0,0 @@
-# This CI is used to test Arm cases. We can set the maximum 16 tasks.
-# The entire testing design is inspired from .github/workflows/compilers.yml.
-
-# By default, Cirrus mounts an empty volume to `/tmp`
-# which triggers all sorts of warnings like "system temporary path is world-writable: /tmp".
-# Lets workaround it by specifying a custom volume mount point.
-env:
-  CIRRUS_VOLUME: /cirrus-ci-volume
-  LANG: C.UTF-8
-
-task:
-  name: Arm64 Graviton2 / $CC
-  skip: "changesIncludeOnly('doc/**', '**.{md,rdoc}')"
-  arm_container:
-    # We use the arm64 images at https://github.com/ruby/ruby-ci-image/pkgs/container/ruby-ci-image .
-    image: ghcr.io/ruby/ruby-ci-image:$CC
-    # Define the used cpu core in each matrix task. We can use total 16 cpu
-    # cores in entire matrix. [cpu] = [total cpu: 16] / [number of tasks]
-    cpu: 8
-    # We can request maximum 4 GB per cpu.
-    # [memory per task] = [memory per cpu: 4 GB] * [cpu]
-    memory: 32G
-  env:
-    CIRRUS_CLONE_DEPTH: 50
-    optflags: '-O1'
-    debugflags: '-ggdb3'
-    RUBY_PREFIX: /tmp/ruby-prefix
-    RUBY_DEBUG: ci rgengc
-    RUBY_TESTOPTS: >-
-      -q
-      --color=always
-      --tty=no
-    matrix:
-      CC: clang-12
-      CC: gcc-11
-  id_script: id
-  set_env_script:
-    # Set `GNUMAKEFLAGS`, because the flags are GNU make specific. Note using
-    # the `make` environment variable used in compilers.yml causes some rubygems
-    # tests to fail.
-    # https://github.com/rubygems/rubygems/issues/4921
-    - echo "GNUMAKEFLAGS=-s -j$((1 + $CIRRUS_CPU))" >> $CIRRUS_ENV
-  print_env_script:
-    - echo "GNUMAKEFLAGS=$GNUMAKEFLAGS"
-  # Arm containers are executed in AWS's EKS, and it's not yet supporting IPv6
-  # See https://github.com/aws/containers-roadmap/issues/835
-  disable_ipv6_script: sudo ./tool/disable_ipv6.sh
-  autogen_script: ./autogen.sh
-  configure_script: >-
-    ./configure -C
-    --enable-debug-env
-    --disable-install-doc
-    --with-ext=-test-/cxxanyargs,+
-    --prefix="$RUBY_PREFIX"
-  make_extract-extlibs_script: make extract-extlibs
-  make_incs_script: make incs
-  make_script: make
-  make_leaked-globals_script: make leaked-globals
-  make_test_script: make test
-  make_install_script: make install
-  install_gems_for_test_script: $RUBY_PREFIX/bin/gem install --no-doc timezone tzinfo
-  make_test-tool_script: make test-tool
-  make_test-all_script: make test-all
-  make_test-spec_script: make test-spec
diff --git a/.document b/.document
index 5494bcc7fe..82ca602bfb 100644
--- a/.document
+++ b/.document
@@ -15,17 +15,26 @@ array.rb
 ast.rb
 dir.rb
 gc.rb
+hash.rb
 io.rb
 kernel.rb
 marshal.rb
 numeric.rb
 nilclass.rb
 pack.rb
+pathname_builtin.rb
 ractor.rb
 string.rb
+symbol.rb
 timev.rb
+thread_sync.rb
 trace_point.rb
 warning.rb
+yjit.rb
+zjit.rb
+
+# Errno::*
+known_errors.inc
 
 # the lib/ directory (which has its own .document file)
 lib
@@ -44,7 +53,4 @@ COPYING.ja
 
 LEGAL
 
-# win32/README.win32 linked from README.md
-win32
-
 doc
diff --git a/.gdbinit b/.gdbinit
index 8979e8b47c..bda544c641 100644
--- a/.gdbinit
+++ b/.gdbinit
@@ -1,23 +1,7 @@
-set startup-with-shell off
-
-define hook-run
-  set $color_type = 0
-  set $color_highlite = 0
-  set $color_end = 0
-end
-
 define ruby_gdb_init
-  if !$color_type
-    set $color_type = "\033[31m"
-  end
-  if !$color_highlite
-    set $color_highlite = "\033[36m"
-  end
-  if !$color_end
-    set $color_end = "\033[m"
-  end
-  if ruby_dummy_gdb_enums.special_consts
-  end
+  init-if-undefined $color_type = "\033[31m"
+  init-if-undefined $color_highlite = "\033[36m"
+  init-if-undefined $color_end = "\033[m"
 end
 
 # set prompt \033[36m(gdb)\033[m\040
@@ -67,7 +51,7 @@ define rp
     printf "%sT_OBJECT%s: ", $color_type, $color_end
     print ((struct RObject *)($arg0))->basic
     if ($flags & ROBJECT_EMBED)
-      print/x *((VALUE*)((struct RObject*)($arg0))->as.ary) @ (ROBJECT_EMBED_LEN_MAX+0)
+      print/x *((VALUE*)((struct RObject*)($arg0))->as.ary) @ (RSHAPE_CAPACITY(rb_obj_shape_id($arg0)))
     else
       print (((struct RObject *)($arg0))->as.heap)
       if (((struct RObject*)($arg0))->as.heap.numiv) > 0
@@ -99,13 +83,11 @@ define rp
     set $regsrc = ((struct RRegexp*)($arg0))->src
     set $rsflags = ((struct RBasic*)$regsrc)->flags
     printf "%sT_REGEXP%s: ", $color_type, $color_end
-    set $len = ($rsflags & RUBY_FL_USER1) ? \
-            ((struct RString*)$regsrc)->as.heap.len : \
-            (($rsflags & (RUBY_FL_USER2|RUBY_FL_USER3|RUBY_FL_USER4|RUBY_FL_USER5|RUBY_FL_USER6)) >> RUBY_FL_USHIFT+2)
+    set $len = ((struct RString*)($arg0))->len
     set print address off
     output *(char *)(($rsflags & RUBY_FL_USER1) ? \
-	    ((struct RString*)$regsrc)->as.heap.ptr : \
-	    ((struct RString*)$regsrc)->as.ary) @ $len
+            ((struct RString*)$regsrc)->as.heap.ptr : \
+            ((struct RString*)$regsrc)->as.embed.ary) @ $len
     set print address on
     printf " len:%ld ", $len
     if $flags & RUBY_FL_USER6
@@ -126,26 +108,26 @@ define rp
       printf "%sT_ARRAY%s: len=%ld ", $color_type, $color_end, $len
       printf "(embed) "
       if ($len == 0)
-	printf "{(empty)} "
+        printf "{(empty)} "
       else
-	print/x *((VALUE*)((struct RArray*)($arg0))->as.ary) @ $len
-	printf " "
+        print/x *((VALUE*)((struct RArray*)($arg0))->as.ary) @ $len
+        printf " "
       end
     else
       set $len = ((struct RArray*)($arg0))->as.heap.len
       printf "%sT_ARRAY%s: len=%ld ", $color_type, $color_end, $len
       if ($flags & RUBY_FL_USER2)
-	printf "(shared) shared="
-	output/x ((struct RArray*)($arg0))->as.heap.aux.shared_root
-	printf " "
+        printf "(shared) shared="
+        output/x ((struct RArray*)($arg0))->as.heap.aux.shared_root
+        printf " "
       else
-	printf "(ownership) capa=%ld ", ((struct RArray*)($arg0))->as.heap.aux.capa
+        printf "(ownership) capa=%ld ", ((struct RArray*)($arg0))->as.heap.aux.capa
       end
       if ($len == 0)
-	printf "{(empty)} "
+        printf "{(empty)} "
       else
-	print/x *((VALUE*)((struct RArray*)($arg0))->as.heap.ptr) @ $len
-	printf " "
+        print/x *((VALUE*)((struct RArray*)($arg0))->as.heap.ptr) @ $len
+        printf " "
       end
     end
     print (struct RArray *)($arg0)
@@ -157,13 +139,15 @@ define rp
   if ($flags & RUBY_T_MASK) == RUBY_T_HASH
     printf "%sT_HASH%s: ", $color_type, $color_end,
     if (((struct RHash *)($arg0))->basic.flags & RHASH_ST_TABLE_FLAG)
-      printf "st len=%ld ", ((struct RHash *)($arg0))->as.st->num_entries
+      set $st = (struct st_table *)((uintptr_t)($arg0) + sizeof(struct RHash))
+      printf "st len=%ld ", $st->num_entries
+      print $st
     else
       printf "li len=%ld bound=%ld ", \
         ((((struct RHash *)($arg0))->basic.flags & RHASH_AR_TABLE_SIZE_MASK) >> RHASH_AR_TABLE_SIZE_SHIFT), \
         ((((struct RHash *)($arg0))->basic.flags & RHASH_AR_TABLE_BOUND_MASK) >> RHASH_AR_TABLE_BOUND_SHIFT)
+	print (struct ar_table_struct *)((uintptr_t)($arg0) + sizeof(struct RHash))
     end
-    print (struct RHash *)($arg0)
   else
   if ($flags & RUBY_T_MASK) == RUBY_T_STRUCT
     set $len = (($flags & (RUBY_FL_USER1|RUBY_FL_USER2)) ? \
@@ -201,12 +185,19 @@ define rp
     print (struct RBasic *)($arg0)
   else
   if ($flags & RUBY_T_MASK) == RUBY_T_DATA
-    if ((struct RTypedData *)($arg0))->typed_flag == 1
-      printf "%sT_DATA%s(%s): ", $color_type, $color_end, ((struct RTypedData *)($arg0))->type->wrap_struct_name
-      print (struct RTypedData *)($arg0)
+    if ($flags & RUBY_TYPED_FL_IS_TYPED_DATA)
+      set $data = (struct RTypedData *)($arg0)
+      set $type = (const rb_data_type_t *)($data->type & ~1)
+      printf "%sT_DATA%s(%s): ", $color_type, $color_end, $type->wrap_struct_name
+      print *$type
+      if ($data->type & 1)
+        print (void *)&$data->data
+      else
+        print $data
+      end
     else
       printf "%sT_DATA%s: ", $color_type, $color_end
-      print (struct RData *)($arg0)
+      print *(struct RData *)($arg0)
     end
   else
   if ($flags & RUBY_T_MASK) == RUBY_T_MATCH
@@ -440,13 +431,11 @@ end
 
 define output_string
   set $flags = ((struct RBasic*)($arg0))->flags
-  set $len = ($flags & RUBY_FL_USER1) ? \
-          ((struct RString*)($arg0))->as.heap.len : \
-          (($flags & (RUBY_FL_USER2|RUBY_FL_USER3|RUBY_FL_USER4|RUBY_FL_USER5|RUBY_FL_USER6)) >> RUBY_FL_USHIFT+2)
+  set $len = ((struct RString*)($arg0))->len
   if $len > 0
     output *(char *)(($flags & RUBY_FL_USER1) ? \
-	    ((struct RString*)($arg0))->as.heap.ptr : \
-	    ((struct RString*)($arg0))->as.ary) @ $len
+            ((struct RString*)($arg0))->as.heap.ptr : \
+            ((struct RString*)($arg0))->as.embed.ary) @ $len
   else
     output ""
   end
@@ -454,13 +443,11 @@ end
 
 define print_string
   set $flags = ((struct RBasic*)($arg0))->flags
-  set $len = ($flags & RUBY_FL_USER1) ? \
-          ((struct RString*)($arg0))->as.heap.len : \
-          (($flags & (RUBY_FL_USER2|RUBY_FL_USER3|RUBY_FL_USER4|RUBY_FL_USER5|RUBY_FL_USER6)) >> RUBY_FL_USHIFT+2)
+  set $len = ((struct RString*)($arg0))->len
   if $len > 0
     printf "%s", *(char *)(($flags & RUBY_FL_USER1) ? \
-	    ((struct RString*)($arg0))->as.heap.ptr : \
-	    ((struct RString*)($arg0))->as.ary) @ $len
+            ((struct RString*)($arg0))->as.heap.ptr : \
+            ((struct RString*)($arg0))->as.embed.ary) @ $len
   end
 end
 
@@ -543,14 +530,14 @@ document rp_bignum
 end
 
 define rp_class
+  set $class_and_classext = (struct RClass_and_rb_classext_t *)($arg0)
   printf "(struct RClass *) %p", (void*)$arg0
-  if ((struct RClass *)($arg0))->ptr.origin_ != $arg0
-    printf " -> %p", ((struct RClass *)($arg0))->ptr.origin_
+  if $class_and_classext->classext->origin_ != (VALUE)$arg0
+    printf " -> %p", $class_and_classext->classext->origin_
   end
   printf "\n"
   rb_classname $arg0
-  print/x *(struct RClass *)($arg0)
-  print *((struct RClass *)($arg0))->ptr
+  print/x *$class_and_classext
 end
 document rp_class
   Print the content of a Class/Module.
@@ -689,11 +676,6 @@ define nd_stts
 end
 
 
-define nd_entry
-  printf "%su3.entry%s: ", $color_highlite, $color_end
-  p ($arg0).u3.entry
-end
-
 define nd_vid
   printf "%su1.id%s: ", $color_highlite, $color_end
   p ($arg0).u1.id
@@ -868,22 +850,22 @@ define rb_numtable_entry
     set $rb_numtable_p = $rb_numtable_tbl->as.packed.bins
     while $rb_numtable_p && $rb_numtable_p < $rb_numtable_tbl->as.packed.bins+$rb_numtable_tbl->num_entries
       if $rb_numtable_p.k == $rb_numtable_id
-	set $rb_numtable_key = $rb_numtable_p.k
-	set $rb_numtable_rec = $rb_numtable_p.v
-	set $rb_numtable_p = 0
+        set $rb_numtable_key = $rb_numtable_p.k
+        set $rb_numtable_rec = $rb_numtable_p.v
+        set $rb_numtable_p = 0
       else
-	set $rb_numtable_p = $rb_numtable_p + 1
+        set $rb_numtable_p = $rb_numtable_p + 1
       end
     end
   else
     set $rb_numtable_p = $rb_numtable_tbl->as.big.bins[st_numhash($rb_numtable_id) % $rb_numtable_tbl->num_bins]
     while $rb_numtable_p
       if $rb_numtable_p->key == $rb_numtable_id
-	set $rb_numtable_key = $rb_numtable_p->key
-	set $rb_numtable_rec = $rb_numtable_p->record
-	set $rb_numtable_p = 0
+        set $rb_numtable_key = $rb_numtable_p->key
+        set $rb_numtable_rec = $rb_numtable_p->record
+        set $rb_numtable_p = 0
       else
-	set $rb_numtable_p = $rb_numtable_p->next
+        set $rb_numtable_p = $rb_numtable_p->next
       end
     end
   end
@@ -921,10 +903,10 @@ document rb_method_entry
 end
 
 define rb_classname
-  # up to 128bit int
-  set $rb_classname = rb_mod_name($arg0)
-  if $rb_classname != RUBY_Qnil
-    rp $rb_classname
+  set $rb_classname = ((struct RClass_and_rb_classext_t*)$arg0)->classext->classpath
+  if $rb_classname != RUBY_Qfalse
+    print_string $rb_classname
+    printf "\n"
   else
     echo anonymous class/module\n
   end
@@ -961,7 +943,7 @@ define iseq
       set $operand_size = ((INSN*)($arg0))->operand_size
       set $operands = ((INSN*)($arg0))->operands
       while $i < $operand_size
-	rp $operands[$i++]
+        rp $operands[$i++]
       end
     end
   end
@@ -979,8 +961,8 @@ end
 
 define rb_ps_vm
   print $ps_vm = (rb_vm_t*)$arg0
-  set $ps_thread_ln = $ps_vm->living_threads.n.next
-  set $ps_thread_ln_last = $ps_vm->living_threads.n.prev
+  set $ps_thread_ln      = $ps_vm->ractor.main_ractor.threads.set.n.next
+  set $ps_thread_ln_last = $ps_vm->ractor.main_ractor.threads.set.n.prev
   while 1
     set $ps_thread_th = (rb_thread_t *)$ps_thread_ln
     set $ps_thread = (VALUE)($ps_thread_th->self)
@@ -1131,7 +1113,7 @@ define rb_ps_thread
   set $ps_thread = (struct RTypedData*)$arg0
   set $ps_thread_th = (rb_thread_t*)$ps_thread->data
   printf "* #<Thread:%p rb_thread_t:%p native_thread:%p>\n", \
-    $ps_thread, $ps_thread_th, $ps_thread_th->thread_id
+    $ps_thread, $ps_thread_th, $ps_thread_th->nt
   set $cfp = $ps_thread_th->ec->cfp
   set $cfpend = (rb_control_frame_t *)($ps_thread_th->ec->vm_stack + $ps_thread_th->ec->vm_stack_size)-1
   while $cfp < $cfpend
@@ -1279,9 +1261,9 @@ document rb_count_objects
   Counts all objects grouped by type.
 end
 
-# Details: https://bugs.ruby-lang.org/projects/ruby-master/wiki/MachineInstructionsTraceWithGDB
+# Details: https://github.com/ruby/ruby/wiki/Machine-Instructions-Trace-with-GDB
 define trace_machine_instructions
-  set logging on
+  set logging enabled
   set height 0
   set width 0
   display/i $pc
@@ -1316,13 +1298,12 @@ define dump_node
   set $flags = ((struct RBasic*)($str))->flags
   printf "%s", (char *)(($flags & RUBY_FL_USER1) ? \
                         ((struct RString*)$str)->as.heap.ptr : \
-                        ((struct RString*)$str)->as.ary)
+                        ((struct RString*)$str)->as.embed.ary)
 end
 
 define print_flags
   printf "RUBY_FL_WB_PROTECTED: %s\n", ((struct RBasic*)($arg0))->flags & RUBY_FL_WB_PROTECTED ? "1" : "0"
-  printf "RUBY_FL_PROMOTED0   : %s\n", ((struct RBasic*)($arg0))->flags & RUBY_FL_PROMOTED0 ? "1" : "0"
-  printf "RUBY_FL_PROMOTED1   : %s\n", ((struct RBasic*)($arg0))->flags & RUBY_FL_PROMOTED1 ? "1" : "0"
+  printf "RUBY_FL_PROMOTED    : %s\n", ((struct RBasic*)($arg0))->flags & RUBY_FL_PROMOTED ? "1" : "0"
   printf "RUBY_FL_FINALIZE    : %s\n", ((struct RBasic*)($arg0))->flags & RUBY_FL_FINALIZE ? "1" : "0"
   printf "RUBY_FL_SHAREABLE   : %s\n", ((struct RBasic*)($arg0))->flags & RUBY_FL_SHAREABLE ? "1" : "0"
   printf "RUBY_FL_EXIVAR      : %s\n", ((struct RBasic*)($arg0))->flags & RUBY_FL_EXIVAR ? "1" : "0"
@@ -1348,3 +1329,8 @@ define print_flags
   printf "RUBY_FL_USER17      : %s\n", ((struct RBasic*)($arg0))->flags & RUBY_FL_USER17 ? "1" : "0"
   printf "RUBY_FL_USER18      : %s\n", ((struct RBasic*)($arg0))->flags & RUBY_FL_USER18 ? "1" : "0"
 end
+
+source -s misc/gdb.py
+
+# Moved from beginning, since it fails on older gdbs
+set startup-with-shell off
diff --git a/.git-blame-ignore-revs b/.git-blame-ignore-revs
new file mode 100644
index 0000000000..d98646febf
--- /dev/null
+++ b/.git-blame-ignore-revs
@@ -0,0 +1,41 @@
+# This is a file used by GitHub to ignore the following commits on `git blame`.
+#
+# You can also do the same thing in your local repository with:
+# $ git config --local blame.ignoreRevsFile .git-blame-ignore-revs
+
+# Expand tabs
+5b21e94bebed90180d8ff63dad03b8b948361089
+c5e9af9c9d890578182a21e7b71b50334cd5579e
+e63a2115f64433b21cb5dd67c5bf8b30f87ef293
+712ac99e4d0384a941c80a9f48f62943ba7d97c0
+d1474affa8e105bece209cc9d594bb0a989859e1
+2da92388b948821269b18d6b178a680f17e41750
+5062c0c621d887367af8a054e5e5d83d7ec57dd3
+
+# Enable Style/StringLiterals cop for RubyGems/Bundler
+d7ffd3fea402239b16833cc434404a7af82d44f3
+
+# [ruby/digest] Revert tab-expansion in external files
+48b09aae7ec5632209229dcc294dd0d75a93a17f
+8a65cf3b61c60e4cb886f59a73ff6db44364bfa9
+39dc9f9093901d40d2998653948d5da38b18ee2c
+
+# [ruby/io-nonblock] Revert tab expansion
+f28287d34c03f472ffe90ea262bdde9affd4b965
+0d842fecb4f75ab3b1d4097ebdb8e88f51558041
+4ba2c66761d6a293abdfba409241d31063cefd62
+
+# Make benchmark indentation consistent
+fc4acf8cae82e5196186d3278d831f2438479d91
+
+# Make prism_compile.c indentation consistent
+40b2c8e5e7e6e5f83cee9276dc9c1922a69292d6
+d2c5867357ed88eccc28c2b3bd4a46e206e7ff85
+
+# Miss-and-revived commits
+a0f7de814ae5c299d6ce99bed5fb308a05d50ba0
+d4e24021d39e1f80f0055b55d91f8d5f22e15084
+7a56c316418980b8a41fcbdc94067b2bda2ad112
+e90282be7ba1bc8e3119f6e1a2c80356ceb3f80a
+26a9e0b4e31f7b5a9cbd755e0a15823a8fa51bae
+2f53985da9ee593fe524d408256835667938c7d7
diff --git a/.gitattributes b/.gitattributes
index d0c2d266b4..6ac6e6fcc3 100644
--- a/.gitattributes
+++ b/.gitattributes
@@ -1,5 +1,6 @@
 *.gemspec diff=ruby
 *.rb diff=ruby
+*.inc.rs linguist-generated=true
 bin svn-properties=svn:ignore=ruby
 bin/* diff=ruby
 tool/update-deps diff=ruby
diff --git a/.github/CODEOWNERS b/.github/CODEOWNERS
deleted file mode 100644
index c8d7ec5e0d..0000000000
--- a/.github/CODEOWNERS
+++ /dev/null
@@ -1,11 +0,0 @@
-# Lines starting with '#' are comments.
-# Each line is a file pattern followed by one or more owners.
-# Code owners will be automatically tagged as reviewers when a pull request is opened
-
-# YJIT sources and tests
-yjit* @maximecb @xrxr @tenderlove
-yjit/* @maximecb @xrxr @tenderlove
-doc/yjit/* @maximecb @xrxr @tenderlove
-bootstraptest/test_yjit* @maximecb @xrxr @tenderlove
-test/ruby/test_yjit* @maximecb @xrxr @tenderlove
-.github/workflows/yjit* @maximecb @xrxr @tenderlove
diff --git a/.github/actions/capiext/action.yml b/.github/actions/capiext/action.yml
new file mode 100644
index 0000000000..49562725f4
--- /dev/null
+++ b/.github/actions/capiext/action.yml
@@ -0,0 +1,86 @@
+name: rubyspec C-API extensions
+
+inputs:
+  builddir:
+    required: false
+    default: '.'
+  make:
+    required: false
+    default: 'make -s'
+
+outputs:
+  key:
+    value: >-
+      ${{
+      !steps.restore.outputs.cache-hit &&
+      github.ref == 'refs/heads/master' &&
+      steps.config.outputs.key
+      }}
+
+runs:
+  using: composite
+
+  steps:
+    - id: config
+      shell: bash
+      run: |
+        eval $(grep -e '^arch *=' -e '^ruby_version *=' -e '^DLEXT *=' Makefile |
+            sed 's/ *= */=/')
+        case "${ruby_version}" in
+        *+*) key=capiexts-${arch}-${ruby_version}-${{ hashFiles('src/spec/ruby/optional/capi/ext/*.[ch]') }};;
+        *)   key=;;
+        esac
+        echo version=$ruby_version >> $GITHUB_OUTPUT
+        echo key="$key" >> $GITHUB_OUTPUT
+        echo DLEXT=$DLEXT >> $GITHUB_OUTPUT
+      working-directory: ${{ inputs.builddir }}
+
+    - name: Restore previous CAPI extensions
+      uses: actions/cache/restore@0400d5f644dc74513175e3cd8d07132dd4860809 # v4.2.4
+      id: cache
+      with:
+        path: ${{ inputs.builddir }}/spec/ruby/optional/capi/ext/
+        key: ${{ steps.config.outputs.key }}
+      if: ${{ steps.config.outputs.key }}
+
+    - name: Run test-spec with previous CAPI extension binaries
+      id: check
+      shell: bash
+      run: |
+        touch spec/ruby/optional/capi/ext/*.$DLEXT
+        [ ! -f spec/ruby/optional/capi/ext/\*.$DLEXT ]
+        ${{ inputs.make }} SPECOPTS=optional/capi test-spec
+      env:
+        DLEXT: ${{ steps.config.outputs.DLEXT }}
+      working-directory: ${{ inputs.builddir }}
+      if: ${{ steps.cache.outputs.cache-hit }}
+
+    - name: Strip CAPI extensions
+      id: strip
+      shell: bash
+      run: |
+        rm -f spec/ruby/optional/capi/ext/*.c
+        [ "$DLEXT" = bundle ] || # separated to .dSYM directories
+        strip spec/ruby/optional/capi/ext/*.$DLEXT
+      env:
+        DLEXT: ${{ steps.config.outputs.DLEXT }}
+      working-directory: ${{ inputs.builddir }}
+      if: >-
+        ${{true
+        && ! steps.cache.outputs.cache-hit
+        && github.ref_name == 'master'
+        }}
+
+    - name: Save CAPI extensions
+      uses: actions/cache/save@0400d5f644dc74513175e3cd8d07132dd4860809 # v4.2.4
+      with:
+        path: ${{ inputs.builddir }}/spec/ruby/optional/capi/ext/
+        key: ${{ steps.config.outputs.key }}
+      if: ${{ steps.strip.outcome == 'success' }}
+
+    - shell: bash
+      run: |
+        echo "::error::Change from ${prev} detected; bump up ABI version"
+      env:
+        prev: ${{ steps.config.outputs.version }}
+      if: ${{ always() && steps.check.outcome == 'failure' }}
diff --git a/.github/actions/compilers/action.yml b/.github/actions/compilers/action.yml
new file mode 100644
index 0000000000..ab5b56a889
--- /dev/null
+++ b/.github/actions/compilers/action.yml
@@ -0,0 +1,133 @@
+name: Compiles ruby in a container
+description: >-
+  Makes ruby using a dedicated container
+
+inputs:
+  tag:
+    required: false
+    default: clang-20
+    description: >-
+      container image tag to use in this run.
+
+  with_gcc:
+    required: false
+    description: >-
+      override compiler path & flags.
+
+  CFLAGS:
+    required: false
+    description: >-
+      C compiler flags to override.
+
+  CXXFLAGS:
+    required: false
+    description: >-
+      C++ compiler flags to override.
+
+  optflags:
+    required: false
+    # -O1 is faster than -O3 in our tests... Majority of time are consumed trying
+    # to optimize binaries.  Also GitHub Actions run on relatively modern CPUs
+    # compared to, say, GCC 4 or Clang 3.  We don't specify `-march=native`
+    # because compilers tend not understand what the CPU is.
+    default: '-O1'
+    description: >-
+      Compiler flags for optimisations.
+
+  cppflags:
+    required: false
+    description: >-
+      Additional preprocessor flags.
+
+  append_configure:
+    required: false
+    default: >-
+      --without-valgrind
+      --without-jemalloc
+      --without-gmp
+    description: >-
+      flags to append to configure.
+
+  enable_shared:
+    required: false
+    default: true
+    description: >-
+      Whether to build libruby.so.
+
+  check:
+    required: false
+    default: ''
+    description: >-
+      Whether to run `make check`
+
+  test_all:
+    required: false
+    default: ''
+    description: >-
+      Whether to run `make test-all` with options for test-all.
+
+  test_spec:
+    required: false
+    default: ''
+    description: >-
+      Whether to run `make test-spec` with options for mspec.
+
+  static_exts:
+    required: false
+    description: >-
+      whitespace separated list of extensions that need be linked statically.
+
+runs:
+  using: composite
+  steps:
+    - shell: bash
+      run: docker pull --quiet 'ghcr.io/ruby/ruby-ci-image:${{ inputs.tag }}'
+
+    - name: Enable Launchable conditionally
+      id: enable-launchable
+      run: echo "enable-launchable=true" >> $GITHUB_OUTPUT
+      shell: bash
+      if: >-
+        ${{
+        github.repository == 'ruby/ruby' ||
+        (github.repository != 'ruby/ruby' && env.LAUNCHABLE_TOKEN)
+        }}
+
+    - name: compile
+      shell: bash
+      run: >-
+        docker run
+        --rm
+        --user=root
+        --volume '${{ github.workspace }}:/github/workspace:ro'
+        --workdir=/github/workspace
+        --entrypoint=/github/workspace/.github/actions/compilers/entrypoint.sh
+        --env CI
+        --env GITHUB_ACTION
+        --env INPUT_WITH_GCC='${{ inputs.with_gcc || inputs.tag }}'
+        --env INPUT_CFLAGS='${{ inputs.CFLAGS }}'
+        --env INPUT_CXXFLAGS='${{ inputs.CXXFLAGS }}'
+        --env INPUT_OPTFLAGS='${{ inputs.OPTFLAGS }}'
+        --env INPUT_CPPFLAGS='${{ inputs.cppflags }}'
+        --env INPUT_APPEND_CONFIGURE='${{ inputs.append_configure }}'
+        --env INPUT_CHECK='${{ inputs.check }}'
+        --env INPUT_TEST_ALL='${{ inputs.test_all }}'
+        --env INPUT_TEST_SPEC='${{ inputs.test_spec }}'
+        --env INPUT_ENABLE_SHARED='${{ inputs.enable_shared }}'
+        --env INPUT_STATIC_EXTS='${{ inputs.static_exts }}'
+        --env LAUNCHABLE_ORGANIZATION='${{ github.repository_owner }}'
+        --env LAUNCHABLE_WORKSPACE='${{ github.event.repository.name }}'
+        --env LAUNCHABLE_ENABLED='${{ steps.enable-launchable.outputs.enable-launchable || false }}'
+        --env GITHUB_PR_HEAD_SHA='${{ github.event.pull_request.head.sha || github.sha }}'
+        --env GITHUB_PULL_REQUEST_URL='${{ github.event.pull_request.html_url }}'
+        --env GITHUB_REF='${{ github.ref }}'
+        --env GITHUB_ACTIONS
+        --env GITHUB_RUN_ID
+        --env GITHUB_REPOSITORY
+        --env GITHUB_WORKFLOW
+        --env GITHUB_RUN_NUMBER
+        --env GITHUB_EVENT_NAME
+        --env GITHUB_SHA
+        --env GITHUB_HEAD_REF
+        --env GITHUB_SERVER_URL
+        'ghcr.io/ruby/ruby-ci-image:${{ inputs.tag }}'
diff --git a/.github/actions/compilers/entrypoint.sh b/.github/actions/compilers/entrypoint.sh
new file mode 100755
index 0000000000..b554151091
--- /dev/null
+++ b/.github/actions/compilers/entrypoint.sh
@@ -0,0 +1,90 @@
+#! /bin/bash
+
+# Copyright (c) 2024 Ruby developers.  All rights reserved.
+#
+# This file is  a part of the programming language  Ruby.  Permission is hereby
+# granted, to  either redistribute and/or  modify this file, provided  that the
+# conditions  mentioned in  the file  COPYING are  met.  Consult  the file  for
+# details.
+
+grouped()
+{
+    echo "::group::${@}"
+    "${@}"
+    echo "::endgroup::"
+}
+
+set -e
+set -u
+set -o pipefail
+
+srcdir="/github/workspace/src"
+builddir="$(mktemp -dt)"
+
+export GITHUB_WORKFLOW='Compilations'
+export CONFIGURE_TTY='never'
+export RUBY_DEBUG='ci rgengc'
+export RUBY_TESTOPTS='-q --color=always --tty=no'
+export RUBY_DEBUG_COUNTER_DISABLE='1'
+export GNUMAKEFLAGS="-j$((1 + $(nproc)))"
+
+case "x${INPUT_ENABLE_SHARED}" in
+x | xno | xfalse )
+    enable_shared='--disable-shared'
+    ;;
+*)
+    enable_shared='--enable-shared'
+    ;;
+esac
+
+pushd ${builddir}
+
+grouped git config --global --add safe.directory ${srcdir}
+
+grouped ${srcdir}/configure        \
+    -C                             \
+    --with-gcc="${INPUT_WITH_GCC}" \
+    --enable-debug-env             \
+    --disable-install-doc          \
+    --with-ext=-test-/cxxanyargs,+ \
+    --without-git                  \
+    ${enable_shared}               \
+    ${INPUT_APPEND_CONFIGURE}      \
+    CFLAGS="${INPUT_CFLAGS}"       \
+    CXXFLAGS="${INPUT_CXXFLAGS}"   \
+    optflags="${INPUT_OPTFLAGS}"   \
+    cppflags="${INPUT_CPPFLAGS}"   \
+    debugflags='-ggdb3' # -g0 disables backtraces when SEGV.  Do not set that.
+
+popd
+
+if [[ -n "${INPUT_STATIC_EXTS}" ]]; then
+    echo "::group::ext/Setup"
+    set -x
+    mkdir ${builddir}/ext
+    (
+        for ext in ${INPUT_STATIC_EXTS}; do
+            echo "${ext}"
+        done
+    ) >> ${builddir}/ext/Setup
+    set +x
+    echo "::endgroup::"
+fi
+
+if [ -n "$INPUT_TEST_ALL" ]; then
+  tests=" -- $INPUT_TEST_ALL"
+else
+  tests=" -- ruby -ext-"
+fi
+
+pushd ${builddir}
+
+grouped make showflags
+grouped make all
+# grouped make install
+
+# Run only `make test` by default. Run other tests if specified.
+grouped make test
+if [[ -n "$INPUT_CHECK" ]]; then grouped make test-tool; fi
+if [[ -n "$INPUT_CHECK" || -n "$INPUT_TEST_ALL" ]]; then grouped make test-all TESTS="$tests"; fi
+if [[ -n "$INPUT_CHECK" || -n "$INPUT_TEST_SPEC" ]]; then grouped env CHECK_LEAKS=true make test-spec MSPECOPT="$INPUT_TEST_SPEC"; fi
diff --git a/.github/actions/launchable/setup/action.yml b/.github/actions/launchable/setup/action.yml
new file mode 100644
index 0000000000..16af8fc3fd
--- /dev/null
+++ b/.github/actions/launchable/setup/action.yml
@@ -0,0 +1,313 @@
+name: Set up Launchable
+description: >-
+  Install the required dependencies and execute the necessary Launchable commands for test recording
+
+inputs:
+  os:
+    required: true
+    description: The operating system that CI runs on. This value is used in Launchable flavor.
+
+  test-opts:
+    default: none
+    required: false
+    description: >-
+      Test options that determine how tests are run.
+      This value is used in the Launchable flavor.
+
+  launchable-token:
+    required: false
+    description: >-
+      Launchable token is needed if you want to run Launchable on your forked repository.
+      See https://github.com/ruby/ruby/wiki/CI-Servers#launchable-ci for details.
+
+  builddir:
+    required: false
+    default: ${{ github.workspace }}
+    description: >-
+      Directory to create Launchable report file.
+
+  srcdir:
+    required: false
+    default: ${{ github.workspace }}
+    description: >-
+      Directory to (re-)checkout source codes. Launchable retrieves the commit information
+      from the directory.
+
+  test-task:
+    required: false
+    default: ${{ matrix.test_task }}
+    description: >-
+      Specifies a single test task to be executed.
+      This value is used in the Launchable flavor.
+      Either 'test-task' or 'multi-test-tasks' must be configured.
+
+  test-tasks:
+    required: false
+    default: '[]'
+    description: >-
+      Specifies an array of multiple test tasks to be executed.
+      For example: '["test", "test-all"]'.
+      If you want to run a single test task, use the 'test-task' input instead.
+
+  is-yjit:
+    required: false
+    default: 'false'
+    description: >-
+      Whether this workflow is executed on YJIT.
+
+outputs:
+  stdout_report_path:
+    value: ${{ steps.global.outputs.stdout_report_path }}
+    description: >-
+      Report file path for standard output.
+
+  stderr_report_path:
+    value: ${{ steps.global.outputs.stderr_report_path }}
+    description: >-
+      Report file path for standard error.
+
+runs:
+  using: composite
+
+  steps:
+    - name: Enable Launchable conditionally
+      id: enable-launchable
+      run: echo "enable-launchable=true" >> $GITHUB_OUTPUT
+      shell: bash
+      if: >-
+        ${{
+        (github.repository == 'ruby/ruby'
+          || (github.repository != 'ruby/ruby'
+          && env.LAUNCHABLE_TOKEN))
+        && (inputs.test-task == 'check'
+          || inputs.test-task == 'test-all'
+          || inputs.test-task == 'test'
+          || contains(fromJSON(inputs.test-tasks), 'test-all')
+          || contains(fromJSON(inputs.test-tasks), 'test'))
+        }}
+
+    # Launchable CLI requires Python and Java.
+    # https://www.launchableinc.com/docs/resources/cli-reference/
+    - name: Set up Python
+      uses: actions/setup-python@871daa956ca9ea99f3c3e30acb424b7960676734 # v5.0.0
+      with:
+        python-version: "3.x"
+      if: >-
+        ${{ steps.enable-launchable.outputs.enable-launchable
+        && !endsWith(inputs.os, 'ppc64le') && !endsWith(inputs.os, 's390x') }}
+
+    - name: Set up Java
+      uses: actions/setup-java@7a445ee88d4e23b52c33fdc7601e40278616c7f8 # v4.0.0
+      with:
+        distribution: 'temurin'
+        java-version: '17'
+      if: >-
+        ${{ steps.enable-launchable.outputs.enable-launchable
+        && !endsWith(inputs.os, 'ppc64le') && !endsWith(inputs.os, 's390x') }}
+
+    - name: Set up Java ppc64le
+      uses: actions/setup-java@7a445ee88d4e23b52c33fdc7601e40278616c7f8 # v4.0.0
+      with:
+        distribution: 'semeru'
+        architecture: 'ppc64le'
+        java-version: '17'
+      if: >-
+        ${{ steps.enable-launchable.outputs.enable-launchable
+        && endsWith(inputs.os, 'ppc64le') }}
+
+    - name: Set up Java s390x
+      uses: actions/setup-java@7a445ee88d4e23b52c33fdc7601e40278616c7f8 # v4.0.0
+      with:
+        distribution: 'semeru'
+        architecture: 's390x'
+        java-version: '17'
+      if: >-
+        ${{ steps.enable-launchable.outputs.enable-launchable
+        && endsWith(inputs.os, 's390x') }}
+
+    - name: Set global vars
+      id: global
+      shell: bash
+      run: |
+        test_all_enabled="${{ inputs.test-task == 'check' ||  inputs.test-task == 'test-all' || contains(fromJSON(inputs.test-tasks), 'test-all') }}"
+        btest_enabled="${{ inputs.test-task == 'check' ||  inputs.test-task == 'test' || contains(fromJSON(inputs.test-tasks), 'test') }}"
+        test_spec_enabled="${{ inputs.test-task == 'check' ||  inputs.test-task == 'test-spec' || contains(fromJSON(inputs.test-tasks), 'test-spec') }}"
+        echo test_all_enabled="${test_all_enabled}" >> $GITHUB_OUTPUT
+        echo btest_enabled="${btest_enabled}" >> $GITHUB_OUTPUT
+        echo test_spec_enabled="${test_spec_enabled}" >> $GITHUB_OUTPUT
+        echo test_all_report_file='launchable_test_all_report.json' >> $GITHUB_OUTPUT
+        echo btest_report_file='launchable_btest_report.json' >> $GITHUB_OUTPUT
+        echo test_spec_report_dir='launchable_test_spec_report' >> $GITHUB_OUTPUT
+        echo stdout_report_path="launchable_stdout.log" >> $GITHUB_OUTPUT
+        echo stderr_report_path="launchable_stderr.log" >> $GITHUB_OUTPUT
+      if: steps.enable-launchable.outputs.enable-launchable
+
+    - name: Set environment variables for Launchable
+      shell: bash
+      run: |
+        : # GITHUB_PULL_REQUEST_URL are used for commenting test reports in Launchable Github App.
+        : # https://github.com/launchableinc/cli/blob/v1.80.1/launchable/utils/link.py#L42
+        echo "GITHUB_PULL_REQUEST_URL=${{ github.event.pull_request.html_url }}" >> $GITHUB_ENV
+        : # The following envs are necessary in Launchable tokenless authentication.
+        : # https://github.com/launchableinc/cli/blob/v1.80.1/launchable/utils/authentication.py#L20
+        echo "LAUNCHABLE_ORGANIZATION=${{ github.repository_owner }}" >> $GITHUB_ENV
+        echo "LAUNCHABLE_WORKSPACE=${{ github.event.repository.name }}" >> $GITHUB_ENV
+        : # https://github.com/launchableinc/cli/blob/v1.80.1/launchable/utils/authentication.py#L71
+        echo "GITHUB_PR_HEAD_SHA=${{ github.event.pull_request.head.sha || github.sha }}" >> $GITHUB_ENV
+        echo "LAUNCHABLE_TOKEN=${{ inputs.launchable-token }}" >> $GITHUB_ENV
+        : # To prevent a slowdown in CI, disable request retries when the Launchable server is unstable.
+        echo "LAUNCHABLE_SKIP_TIMEOUT_RETRY=1" >> $GITHUB_ENV
+        echo "LAUNCHABLE_COMMIT_TIMEOUT=1" >> $GITHUB_ENV
+      if: steps.enable-launchable.outputs.enable-launchable
+
+    - name: Set up path
+      shell: bash
+      working-directory: ${{ inputs.srcdir }}
+      # Since updated PATH variable will be available in only subsequent actions, we need to add the path beforehand.
+      # https://docs.github.com/en/actions/using-workflows/workflow-commands-for-github-actions#adding-a-system-path
+      run: echo "$(python -msite --user-base)/bin" >> $GITHUB_PATH
+      if: >-
+        ${{
+        steps.enable-launchable.outputs.enable-launchable
+        && (startsWith(inputs.os, 'macos')
+          || endsWith(inputs.os, 'ppc64le')
+          || endsWith(inputs.os, 's390x'))
+        }}
+
+    - name: Set up Launchable
+      id: setup-launchable
+      shell: bash
+      working-directory: ${{ inputs.srcdir }}
+      run: |
+        set -x
+        pip install --user launchable
+        : # The build name cannot include a slash, so we replace the string here.
+        github_ref="${{ github.ref }}"
+        github_ref="${github_ref//\//_}"
+        : # With the --name option, we need to configure a unique identifier for this build.
+        : # To avoid setting the same build name as the CI which runs on other branches, we use the branch name here.
+        build_name="${github_ref}_${GITHUB_PR_HEAD_SHA}"
+        test_opts="${{ inputs.test-opts }}"
+        test_opts="${test_opts// /}"
+        test_opts="${test_opts//=/:}"
+        test_all_test_suite='test-all'
+        btest_test_suite='btest'
+        test_spec_test_suite='test-spec'
+        if [ "${{ inputs.is-yjit }}" = "true" ]; then
+          test_all_test_suite="yjit-${test_all_test_suite}"
+          btest_test_suite="yjit-${btest_test_suite}"
+          test_spec_test_suite="yjit-${test_spec_test_suite}"
+        fi
+        # launchable_setup target var -- refers ${target} prefixed variables
+        launchable_setup() {
+          local target=$1 session
+          eval [ "\${${target}_enabled}" = "true" ] || return
+          eval local suite=\${${target}_test_suite}
+          session=$(launchable record session \
+            --build "${build_name}" \
+            --observation \
+            --flavor os="${{ inputs.os }}" \
+            --flavor test_task="${{ inputs.test-task }}" \
+            --flavor test_opts="${test_opts}" \
+            --flavor workflow="${{ github.workflow }}" \
+            --test-suite ${suite} \
+            )
+          echo "${target}_session=${session}" >> $GITHUB_OUTPUT
+        }
+
+        launchable record build --name "${build_name}"
+        if launchable_setup test_all; then
+          echo "TESTS=${TESTS:+$TESTS }--launchable-test-reports=${test_all_report_file}" >> $GITHUB_ENV
+        fi
+        if launchable_setup btest; then
+          echo "BTESTS=${BTESTS:+$BTESTS }--launchable-test-reports=${btest_report_file}" >> $GITHUB_ENV
+        fi
+        if launchable_setup test_spec; then
+          echo "SPECOPTS=${SPECOPTS:$SPECOPTS }--launchable-test-reports=${test_spec_report_dir}" >> $GITHUB_ENV
+          echo test_spec_enabled=true >> $GITHUB_OUTPUT
+        fi
+
+        echo launchable_setup_dir=$(pwd) >> $GITHUB_OUTPUT
+      if: steps.enable-launchable.outputs.enable-launchable
+      env:
+        test_all_enabled: ${{ steps.global.outputs.test_all_enabled }}
+        btest_enabled: ${{ steps.global.outputs.btest_enabled }}
+        test_spec_enabled: ${{ steps.global.outputs.test_spec_enabled }}
+        test_all_report_file: ${{ steps.global.outputs.test_all_report_file }}
+        btest_report_file: ${{ steps.global.outputs.btest_report_file }}
+        test_spec_report_dir: ${{ steps.global.outputs.test_spec_report_dir }}
+
+    - name: make test-spec report directory in build directory
+      shell: bash
+      working-directory: ${{ inputs.builddir }}
+      run: mkdir "${test_spec_report_dir}"
+      if: ${{ steps.setup-launchable.outputs.test_spec_enabled == 'true' }}
+      env:
+        test_spec_report_dir: ${{ steps.global.outputs.test_spec_report_dir }}
+
+    - name: Clean up test results in Launchable
+      uses: gacts/run-and-post-run@674528335da98a7afc80915ff2b4b860a0b3553a # v1.4.0
+      with:
+        shell: bash
+        working-directory: ${{ inputs.builddir }}
+        post: |
+          rm -f "${test_all_report_file}"
+          rm -f "${btest_report_file}"
+          rm -fr "${test_spec_report_dir}"
+          rm -f launchable_stdout.log
+          rm -f launchable_stderr.log
+      if: always() && steps.setup-launchable.outcome == 'success'
+      env:
+        test_all_report_file: ${{ steps.global.outputs.test_all_report_file }}
+        btest_report_file: ${{ steps.global.outputs.btest_report_file }}
+        test_spec_report_dir: ${{ steps.global.outputs.test_spec_report_dir }}
+
+    - name: Record test results in Launchable
+      uses: gacts/run-and-post-run@674528335da98a7afc80915ff2b4b860a0b3553a # v1.4.0
+      with:
+        shell: bash
+        working-directory: ${{ inputs.builddir }}
+        post: |
+          if [[ "${test_all_enabled}" = "true" ]]; then \
+            launchable record attachment \
+              --session "${test_all_session}" \
+              "${stdout_report_path}" \
+              "${stderr_report_path}"; \
+            launchable record tests \
+              --session "${test_all_session}" \
+              raw "${test_all_report_file}" || true; \
+          fi
+
+          if [[ "${btest_enabled}" = "true" ]]; then \
+            launchable record attachment \
+              --session "${btest_session}" \
+              "${stdout_report_path}" \
+              "${stderr_report_path}"; \
+            launchable record tests \
+              --session "${btest_session}" \
+              raw "${btest_report_file}" || true; \
+          fi
+
+          if [[ "${test_spec_enabled}" = "true" ]]; then \
+            launchable record attachment \
+              --session "${test_spec_session}" \
+              "${stdout_report_path}" \
+              "${stderr_report_path}"; \
+            launchable record tests \
+              --session "${test_spec_session}" \
+              raw ${test_spec_report_dir}/* || true; \
+          fi
+      if: ${{ always() && steps.setup-launchable.outcome == 'success' }}
+      env:
+        test_all_report_file: ${{ steps.global.outputs.test_all_report_file }}
+        btest_report_file: ${{ steps.global.outputs.btest_report_file }}
+        test_spec_report_dir: ${{ steps.global.outputs.test_spec_report_dir }}
+        test_all_enabled: ${{ steps.global.outputs.test_all_enabled }}
+        btest_enabled: ${{ steps.global.outputs.btest_enabled }}
+        test_spec_enabled: ${{ steps.global.outputs.test_spec_enabled }}
+        test_all_session: ${{ steps.setup-launchable.outputs.test_all_session }}
+        btest_session: ${{ steps.setup-launchable.outputs.btest_session }}
+        test_spec_session: ${{ steps.setup-launchable.outputs.test_spec_session }}
+        stdout_report_path: ${{ steps.global.outputs.stdout_report_path }}
+        stderr_report_path: ${{ steps.global.outputs.stderr_report_path }}
+        LAUNCHABLE_SETUP_DIR: ${{ steps.setup-launchable.outputs.launchable_setup_dir }}
diff --git a/.github/actions/setup/directories/action.yml b/.github/actions/setup/directories/action.yml
new file mode 100644
index 0000000000..0e8ffd59ef
--- /dev/null
+++ b/.github/actions/setup/directories/action.yml
@@ -0,0 +1,194 @@
+name: Setup directories etc.
+description: >-
+  Set up the source code and build directories (plus some
+  environmental tweaks)
+
+inputs:
+  srcdir:
+    required: false
+    default: ${{ github.workspace }}
+    description: >-
+      Directory to (re-)checkout source codes.  This will be created
+      if absent.  If there is no `configure` file that is also
+      generated inside.
+
+  builddir:
+    required: false
+    default: ${{ github.workspace }}
+    description: >-
+      Where binaries and other generated contents go.  This will be
+      created if absent.
+
+  make-command:
+    required: false
+    type: string
+    default: 'make'
+    description: >-
+      The command of `make`.
+
+  makeup:
+    required: false
+    type: boolean
+    # Note that `default: false` evaluates to a string constant
+    # `'false'`, which is a truthy value :sigh:
+    # https://github.com/actions/runner/issues/2238
+    default: ''
+    description: >-
+      If set to true, additionally runs `make up`.
+
+  checkout:
+    required: false
+    type: boolean
+    default: true
+    description: >-
+      If set to '' (false), skip running actions/checkout. This is useful when
+      you don't want to overwrite a GitHub token that is already set up.
+
+  dummy-files:
+    required: false
+    type: boolean
+    default: ''
+    description: >-
+      If set to true, creates dummy files in build dir.
+
+  fetch-depth:
+    required: false
+    default: '1'
+    description: The depth of commit history fetched from the remote repository
+
+  clean:
+    required: false
+    type: boolean
+    default: ''
+    description: >-
+      If set to true, clean build directory.
+
+outputs: {} # nothing?
+
+runs:
+  using: composite
+
+  steps:
+    # Note that `shell: bash` works on both Windows and Linux, but not
+    # `shell: sh`.  This is because GitHub hosted Windows runners have
+    # their bash manually installed.
+    - shell: bash
+      run: |
+        mkdir -p ${{ inputs.srcdir }}
+        mkdir -p ${{ inputs.builddir }}
+
+    # Did you know that actions/checkout works without git(1)?  We are
+    # checking that here.
+    - id: which
+      shell: bash
+      run: |
+        echo "git=`command -v git`" >> "$GITHUB_OUTPUT"
+        echo "sudo=`sudo true && command -v sudo`" >> "$GITHUB_OUTPUT"
+        echo "autoreconf=`command -v autoreconf`" >> "$GITHUB_OUTPUT"
+
+    - if: steps.which.outputs.git
+      shell: bash
+      run: |
+        git config --global core.autocrlf false
+        git config --global core.eol lf
+        git config --global advice.detachedHead 0
+        git config --global init.defaultBranch garbage
+
+    - if: inputs.checkout
+      uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
+      with:
+        path: ${{ inputs.srcdir }}
+        fetch-depth: ${{ inputs.fetch-depth }}
+
+    - uses: actions/cache@8b402f58fbc84540c8b491a91e594a4576fec3d7 # v5.0.2
+      with:
+        path: ${{ inputs.srcdir }}/.downloaded-cache
+        key: ${{ runner.os }}-${{ runner.arch }}-downloaded-cache
+
+    - if: steps.which.outputs.autoreconf
+      shell: bash
+      working-directory: ${{ inputs.srcdir }}
+      run: ./autogen.sh --install
+
+    # This is for MinGW.
+    - if: runner.os == 'Windows'
+      shell: bash
+      run: echo "GNUMAKEFLAGS=-j$((2 * NUMBER_OF_PROCESSORS))" >> $GITHUB_ENV
+
+    - if: runner.os == 'Linux'
+      shell: bash
+      run: echo "GNUMAKEFLAGS=-sj$((1 + $(nproc)))" >> "$GITHUB_ENV"
+
+    # macOS' GNU make is so old that they doesn't understand `GNUMAKEFLAGS`.
+    - if: runner.os == 'macOS'
+      shell: bash
+      run: echo "MAKEFLAGS=-j$((1 + $(sysctl -n hw.activecpu)))" >> "$GITHUB_ENV"
+
+    - if: inputs.makeup
+      shell: bash
+      working-directory: ${{ inputs.srcdir }}
+      run: |
+        touch config.status .rbconfig.time
+        for mk in Makefile GNUmakefile; do
+          sed -f tool/prereq.status template/$mk.in > $mk
+        done
+        make up
+
+    # Cleanup, runs even on failure
+    - if: always() && inputs.makeup
+      shell: bash
+      working-directory: ${{ inputs.srcdir }}
+      run: |
+        rm -f config.status .rbconfig.time \
+          Makefile GNUmakefile uncommon.mk enc.mk noarch-fake.rb
+
+    - if: steps.which.outputs.sudo
+      shell: bash
+      run: |
+        sudo chmod -R go-w /usr/share
+        chmod -v go-w $HOME $HOME/.config || :
+        declare -a dirs # -A is not supported by old bash, e.g. macos
+        SAVE_IFS="$IFS" IFS=:; set $PATH
+        for d do
+          while [ -d "$d" ]; do
+            case "$IFS${dirs[*]}$IFS" in *"$IFS$d$IFS"*) ;; *) dirs+=("$d");; esac
+            d="${d%/*}"
+          done
+        done
+        IFS="$SAVE_IFS"
+        sudo chmod -v go-w "${dirs[@]}" || :
+
+    - if: inputs.dummy-files == 'true'
+      shell: bash
+      id: dummy-files
+      working-directory: ${{ inputs.builddir }}
+      run: |
+        : Create dummy files in build dir
+        set {{a..z},{A..Z},{0..9},foo,bar,test,zzz}.rb
+        for file; do \
+          echo > $file "raise 'do not load $file'"; \
+        done
+        # drop {a..z}.rb if case-insensitive filesystem
+        grep -F A.rb a.rb > /dev/null && set "${@:27}"
+        echo clean="cd ${{ inputs.builddir }} && rm $*" >> $GITHUB_OUTPUT
+
+    - if: inputs.clean == 'true'
+      shell: bash
+      id: clean
+      run: |
+        echo distclean='cd ${{ inputs.builddir }} && ${{ inputs.make-command }} distclean' >> $GITHUB_OUTPUT
+        echo remained-files='find ${{ inputs.builddir }} -ls' >> $GITHUB_OUTPUT
+        [ "${{ inputs.builddir }}" = "${{ inputs.srcdir }}" ] ||
+        echo final='rmdir ${{ inputs.builddir }}' >> $GITHUB_OUTPUT
+
+    - name: clean
+      uses: gacts/run-and-post-run@81b6ce503cde93862cec047c54652e45c5dca991 # v1.4.3
+      with:
+        working-directory:
+        post: |
+          ${{ steps.dummy-files.outputs.clean }}
+          ${{ steps.clean.outputs.distclean }}
+          ${{ steps.clean.outputs.remained-files }}
+          ${{ steps.clean.outputs.final }}
+      # rmdir randomly fails due to launchable files
+      continue-on-error: true
diff --git a/.github/actions/setup/macos/action.yml b/.github/actions/setup/macos/action.yml
new file mode 100644
index 0000000000..d0072ff828
--- /dev/null
+++ b/.github/actions/setup/macos/action.yml
@@ -0,0 +1,29 @@
+name: Setup macOS environment
+description: >-
+  Installs necessary packages via Homebrew.
+
+inputs: {} # nothing?
+
+outputs: {} # nothing?
+
+runs:
+  using: composite
+
+  steps:
+    - name: brew
+      shell: bash
+      run: |
+        brew install --quiet jemalloc gmp libffi openssl@3 zlib autoconf automake libtool
+
+    - name: Set ENV
+      shell: bash
+      run: |
+        dir_config() {
+          local args=() lib var="$1"; shift
+          for lib in "$@"; do
+            args+=("--with-${lib%@*}-dir=$(brew --prefix $lib)")
+          done
+          echo "$var=${args[*]}" >> $GITHUB_ENV
+        }
+        dir_config ruby_configure_args gmp
+        dir_config CONFIGURE_ARGS openssl@3
diff --git a/.github/actions/setup/ubuntu/action.yml b/.github/actions/setup/ubuntu/action.yml
new file mode 100644
index 0000000000..a9e5b41951
--- /dev/null
+++ b/.github/actions/setup/ubuntu/action.yml
@@ -0,0 +1,53 @@
+name: Setup ubuntu environment
+description: >-
+  At the beginning there was no way but to copy & paste `apt-get`
+  everywhere.  But now that we have composite actions, it seems better
+  merge them into one.
+
+inputs:
+  arch:
+    required: false
+    default: ''
+    description: >-
+      Architecture.  Because we run this on a GitHub-hosted runner
+      acceptable value for this input is very limited.
+
+outputs:
+  arch:
+    value: ${{ steps.uname.outputs.uname }}
+    description: >-
+      Actual architecture.  This could be different from the one
+      passed to the `inputs.arch`.  For instance giving `i386` to this
+      action yields `i686`.
+
+runs:
+  using: composite
+
+  steps:
+    - name: set SETARCH
+      shell: bash
+      run: echo "SETARCH=${setarch}" >> "$GITHUB_ENV"
+      env:
+        setarch: ${{ inputs.arch && format('setarch {0} --', inputs.arch) }}
+
+    - id: uname
+      name: uname
+      shell: bash
+      run: |
+        echo uname=`${SETARCH} uname -m` >> "$GITHUB_OUTPUT"
+        echo dpkg=`${SETARCH} uname -m | sed s/686/386/` >> "$GITHUB_OUTPUT"
+
+    - name: apt-get
+      shell: bash
+      env:
+        arch: ${{ inputs.arch && format(':{0}', steps.uname.outputs.dpkg) || '' }}
+      run: |
+        set -x
+        ${arch:+sudo dpkg --add-architecture ${arch#:}}
+        sudo apt-get update -qq || :
+        sudo apt-get install --no-install-recommends -qq -y -o=Dpkg::Use-Pty=0 \
+        ${arch:+cross}build-essential${arch/:/-} \
+        libssl-dev${arch} libyaml-dev${arch} libreadline6-dev${arch} \
+        zlib1g-dev${arch} libncurses5-dev${arch} libffi-dev${arch} \
+        autoconf ruby
+        sudo apt-get install -qq -y pkg-config${arch} || :
diff --git a/.github/actions/slack/action.yml b/.github/actions/slack/action.yml
new file mode 100644
index 0000000000..4a398da1d1
--- /dev/null
+++ b/.github/actions/slack/action.yml
@@ -0,0 +1,51 @@
+name: Post a message to slack
+description: >-
+  We have our ruby/action-slack webhook.  However its arguments are
+  bit verbose to be listed in every workflow files.  Better merge them
+  into one.
+
+inputs:
+  SLACK_WEBHOOK_URL:
+    required: true
+    description: >-
+      The URL to post the payload.  This is an input because it tends
+      to be stored in a secrets vault and a composite action cannot
+      look into one.
+
+  label:
+    required: false
+    description: >-
+      Human-readable description of the run, something like "DEBUG=1".
+      This need not be unique among runs.
+
+  event_name:
+    required: false
+    default: 'push'
+    description: >-
+      Target event to trigger notification. Notify only push by default.
+
+  extra_channel_id:
+    required: false
+    description: >-
+      Slack channel ID to notify besides #alerts and #alerts-emoji.
+
+outputs: {} # Nothing?
+
+runs:
+  using: composite
+
+  steps:
+    - uses: ruby/action-slack@54175162371f1f7c8eb94d7c8644ee2479fcd375 # v3.2.2
+      with:
+        payload: |
+          {
+            "ci": "GitHub Actions",
+            "env": "${{ github.workflow }}${{ inputs.label && format(' / {0}', inputs.label) }}",
+            "url": "https://github.com/${{ github.repository }}/actions/runs/${{ github.run_id }}",
+            "commit": "${{ github.sha }}",
+            "branch": "${{ github.ref_name }}"
+            ${{ inputs.extra_channel_id && format(', "extra_channel_id": "{0}"', inputs.extra_channel_id) }}
+          }
+      env:
+        SLACK_WEBHOOK_URL: ${{ inputs.SLACK_WEBHOOK_URL }}
+      if: ${{ github.event_name == inputs.event_name && startsWith(github.repository, 'ruby/') }}
diff --git a/.github/auto_request_review.yml b/.github/auto_request_review.yml
new file mode 100644
index 0000000000..38496d5ceb
--- /dev/null
+++ b/.github/auto_request_review.yml
@@ -0,0 +1,20 @@
+files:
+  'yjit*': [team:jit]
+  'yjit/**/*': [team:jit]
+  'yjit/src/cruby_bindings.inc.rs': []
+  'bootstraptest/test_yjit*': [team:jit]
+  'test/ruby/test_yjit*': [team:jit]
+  'zjit*': [team:jit]
+  'zjit/**/*': [team:jit]
+  'zjit/src/cruby_bindings.inc.rs': []
+  'test/ruby/test_zjit*': [team:jit]
+  'defs/jit.mk': [team:jit]
+  'tool/zjit_bisect.rb': [team:jit]
+  'doc/jit/*': [team:jit]
+  # Skip github workflow files because the team don't necessarily need to review dependabot updates for GitHub Actions. It's noisy in notifications, and they're auto-merged anyway.
+options:
+  ignore_draft: true
+  # This currently doesn't work as intended. We want to skip reviews when only
+  # cruby_bingings.inc.rs is modified, but this skips reviews even when other
+  # files are modified as well. To be enabled after fixing the behavior.
+  #last_files_match_only: true
diff --git a/.github/codeql/codeql-config.yml b/.github/codeql/codeql-config.yml
deleted file mode 100644
index 91f82b842b..0000000000
--- a/.github/codeql/codeql-config.yml
+++ /dev/null
@@ -1,3 +0,0 @@
-name: "CodeQL config for the Ruby language"
-
-languages: cpp
diff --git a/.github/dependabot.yml b/.github/dependabot.yml
index b18fd29357..2c2982d1d4 100644
--- a/.github/dependabot.yml
+++ b/.github/dependabot.yml
@@ -3,4 +3,20 @@ updates:
   - package-ecosystem: 'github-actions'
     directory: '/'
     schedule:
-      interval: 'weekly'
+      interval: 'daily'
+  - package-ecosystem: 'github-actions'
+    directory: '/.github/actions/slack'
+    schedule:
+      interval: 'daily'
+  - package-ecosystem: 'github-actions'
+    directory: '/.github/actions/setup/directories'
+    schedule:
+      interval: 'daily'
+  - package-ecosystem: 'cargo'
+    directory: '/yjit'
+    schedule:
+      interval: 'daily'
+  - package-ecosystem: 'vcpkg'
+    directory: '/'
+    schedule:
+      interval: 'daily'
diff --git a/.github/labeler.yml b/.github/labeler.yml
new file mode 100644
index 0000000000..e81aed8e98
--- /dev/null
+++ b/.github/labeler.yml
@@ -0,0 +1,6 @@
+Documentation:
+- changed-files:
+  - all-globs-to-all-files: doc/**
+
+Backport:
+- base-branch: 'ruby_3_\d'
diff --git a/.github/workflows/annocheck.yml b/.github/workflows/annocheck.yml
new file mode 100644
index 0000000000..899d601aef
--- /dev/null
+++ b/.github/workflows/annocheck.yml
@@ -0,0 +1,110 @@
+name: Annocheck
+
+on:
+  push:
+    paths-ignore:
+      - 'doc/**'
+      - '**/man/*'
+      - '**.md'
+      - '**.rdoc'
+      - '**/.document'
+      - '.*.yml'
+  pull_request:
+    paths-ignore:
+      - 'doc/**'
+      - '**/man/*'
+      - '**.md'
+      - '**.rdoc'
+      - '**/.document'
+      - '.*.yml'
+  merge_group:
+
+concurrency:
+  group: ${{ github.workflow }} / ${{ startsWith(github.event_name, 'pull') && github.ref_name || github.sha }}
+  cancel-in-progress: ${{ startsWith(github.event_name, 'pull') }}
+
+permissions:
+  contents: read
+
+jobs:
+  compile:
+    name: test-annocheck
+
+    runs-on: ubuntu-latest
+
+    container:
+      image: ghcr.io/ruby/ruby-ci-image:gcc-11
+      options: --user root
+
+    if: >-
+      ${{!(false
+      || contains(github.event.head_commit.message, '[DOC]')
+      || contains(github.event.pull_request.title, '[DOC]')
+      || contains(github.event.pull_request.labels.*.name, 'Documentation')
+      || (github.event_name == 'push' && github.event.pull_request.user.login == 'dependabot[bot]')
+      )}}
+
+    env:
+      CONFIGURE_TTY: never
+      GITPULLOPTIONS: --no-tags origin ${{ github.ref }}
+      RUBY_DEBUG: ci rgengc
+      RUBY_TESTOPTS: >-
+        -q
+        --color=always
+        --tty=no
+      # FIXME: Drop skipping options
+      # https://bugs.ruby-lang.org/issues/18061
+      # https://sourceware.org/annobin/annobin.html/Test-pie.html
+      TEST_ANNOCHECK_OPTS: '--skip-pie --skip-gaps'
+
+    steps:
+      - run: id
+        working-directory:
+
+      - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
+        with:
+          sparse-checkout-cone-mode: false
+          sparse-checkout: /.github
+
+      - uses: ./.github/actions/setup/directories
+        with:
+          srcdir: src
+          builddir: build
+          makeup: true
+
+      - uses: ruby/setup-ruby@b90be12699fdfcbee4440c2bba85f6f460446bb0 # v1.279.0
+        with:
+          ruby-version: '3.1'
+          bundler: none
+
+      # Minimal flags to pass the check.
+      # -g0 disables backtraces when SEGV.  Do not set that.
+      - name: Run configure
+        run: >
+          ../src/configure -C
+          --enable-debug-env
+          --disable-install-doc
+          --with-ext=-test-/cxxanyargs,+
+          --without-valgrind
+          --without-jemalloc
+          --without-gmp
+          --with-gcc="gcc-11 -fcf-protection -Wa,--generate-missing-build-notes=yes"
+          --enable-shared
+          debugflags=-ggdb3
+          optflags=-O2
+          LDFLAGS=-Wl,-z,now
+
+      - run: make showflags
+
+      - run: make
+
+      - run: make test-annocheck
+
+      - uses: ./.github/actions/slack
+        with:
+          SLACK_WEBHOOK_URL: ${{ secrets.SIMPLER_ALERTS_URL }} # ruby-lang slack: ruby/simpler-alerts-bot
+        if: ${{ failure() }}
+
+defaults:
+  run:
+    working-directory: build
diff --git a/.github/workflows/auto_request_review.yml b/.github/workflows/auto_request_review.yml
new file mode 100644
index 0000000000..207315a084
--- /dev/null
+++ b/.github/workflows/auto_request_review.yml
@@ -0,0 +1,20 @@
+name: Auto Request Review
+on:
+  pull_request_target:
+    types: [opened, ready_for_review, reopened]
+    branches: [master]
+
+permissions:
+  contents: read
+
+jobs:
+  auto-request-review:
+    name: Auto Request Review
+    runs-on: ubuntu-latest
+    if: ${{ github.repository == 'ruby/ruby' && github.base_ref == 'master' }}
+    steps:
+      - name: Request review based on files changes and/or groups the author belongs to
+        uses: necojackarc/auto-request-review@e89da1a8cd7c8c16d9de9c6e763290b6b0e3d424 # v0.13.0
+        with:
+          # scope: public_repo
+          token: ${{ secrets.MATZBOT_AUTO_REQUEST_REVIEW_TOKEN }}
diff --git a/.github/workflows/auto_review_pr.yml b/.github/workflows/auto_review_pr.yml
new file mode 100644
index 0000000000..ad0e63ba12
--- /dev/null
+++ b/.github/workflows/auto_review_pr.yml
@@ -0,0 +1,33 @@
+name: Auto Review PR
+on:
+  pull_request_target:
+    types: [opened, ready_for_review, reopened]
+    branches: [master]
+
+permissions:
+  contents: read
+
+jobs:
+  auto-review-pr:
+    name: Auto Review PR
+    runs-on: ubuntu-latest
+    if: ${{ github.repository == 'ruby/ruby' && github.base_ref == 'master' }}
+
+    permissions:
+      pull-requests: write
+      contents: read
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v6.0.1
+
+      - uses: ruby/setup-ruby@b90be12699fdfcbee4440c2bba85f6f460446bb0 # v1.279.0
+        with:
+          ruby-version: '3.4'
+          bundler: none
+
+      - name: Auto Review PR
+        run: ruby tool/auto_review_pr.rb "$GITHUB_PR_NUMBER"
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          GITHUB_PR_NUMBER: ${{ github.event.pull_request.number }}
diff --git a/.github/workflows/baseruby.yml b/.github/workflows/baseruby.yml
index 7385fc4d9e..d3e734f885 100644
--- a/.github/workflows/baseruby.yml
+++ b/.github/workflows/baseruby.yml
@@ -4,63 +4,71 @@ on:
   push:
     paths-ignore:
       - 'doc/**'
+      - '**/man/*'
       - '**.md'
       - '**.rdoc'
+      - '**/.document'
+      - '.*.yml'
   pull_request:
     paths-ignore:
       - 'doc/**'
+      - '**/man/*'
       - '**.md'
       - '**.rdoc'
+      - '**/.document'
+      - '.*.yml'
+  merge_group:
 
 concurrency:
   group: ${{ github.workflow }} / ${{ startsWith(github.event_name, 'pull') && github.ref_name || github.sha }}
   cancel-in-progress: ${{ startsWith(github.event_name, 'pull') }}
 
+permissions:
+  contents: read
+
 jobs:
   baseruby:
     name: BASERUBY
-    runs-on: ubuntu-20.04
-    if: ${{ !startsWith(github.event.head_commit.message, '[DOC]') && !contains(github.event.pull_request.labels.*.name, 'Documentation') }}
+
+    runs-on: ubuntu-22.04
+
+    if: >-
+      ${{!(false
+      || contains(github.event.head_commit.message, '[DOC]')
+      || contains(github.event.pull_request.title, '[DOC]')
+      || contains(github.event.pull_request.labels.*.name, 'Documentation')
+      || (github.event_name == 'push' && github.event.pull_request.user.login == 'dependabot[bot]')
+      )}}
+
     strategy:
       matrix:
         ruby:
-          - ruby-2.2
-#         - ruby-2.3
-#         - ruby-2.4
-#         - ruby-2.5
-#         - ruby-2.6
-#         - ruby-2.7
-          - ruby-3.0
           - ruby-3.1
+          - ruby-3.2
+          - ruby-3.3
 
     steps:
-      - uses: actions/checkout@v3
-      - uses: actions/cache@v3
-        with:
-          path: .downloaded-cache
-          key: downloaded-cache
-      - uses: ruby/setup-ruby@v1
+      - uses: ruby/setup-ruby@b90be12699fdfcbee4440c2bba85f6f460446bb0 # v1.279.0
         with:
           ruby-version: ${{ matrix.ruby }}
           bundler: none
-      - run: echo "GNUMAKEFLAGS=-j$((1 + $(nproc --all)))" >> $GITHUB_ENV
-      - run: sudo apt-get install build-essential autoconf bison libyaml-dev
-      - run: ./autogen.sh
+
+      - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
+
+      - uses: ./.github/actions/setup/ubuntu
+
+      - uses: ./.github/actions/setup/directories
+        with:
+          makeup: true
+
       - run: ./configure --disable-install-doc
-      - run: make common-srcs
-      - run: make incs
+
       - run: make all
+
       - run: make test
-      - uses: k0kubun/action-slack@v2.0.0
+
+      - uses: ./.github/actions/slack
         with:
-          payload: |
-            {
-              "ci": "GitHub Actions",
-              "env": "${{ github.workflow }} / BASERUBY @ ${{ matrix.ruby }}",
-              "url": "https://github.com/${{ github.repository }}/actions/runs/${{ github.run_id }}",
-              "commit": "${{ github.sha }}",
-              "branch": "${{ github.ref }}".split('/').reverse()[0]
-            }
-        env:
+          label: ${{ matrix.ruby }}
           SLACK_WEBHOOK_URL: ${{ secrets.SIMPLER_ALERTS_URL }} # ruby-lang slack: ruby/simpler-alerts-bot
-        if: ${{ failure() && github.event_name == 'push' }}
+        if: ${{ failure() }}
diff --git a/.github/workflows/bundled_gems.yml b/.github/workflows/bundled_gems.yml
index 83f01d5868..59f64e8312 100644
--- a/.github/workflows/bundled_gems.yml
+++ b/.github/workflows/bundled_gems.yml
@@ -1,133 +1,190 @@
 name: bundled_gems
 
+env:
+  UPDATE_ENABLED: true
+
 on:
   push:
+    branches: ['master']
     paths:
       - '.github/workflows/bundled_gems.yml'
       - 'gems/bundled_gems'
   pull_request:
+    branches: ['master']
     paths:
       - '.github/workflows/bundled_gems.yml'
       - 'gems/bundled_gems'
+  merge_group:
   schedule:
     - cron: '45 6 * * *'
+  workflow_dispatch:
+
+permissions: # added using https://github.com/step-security/secure-workflows
+  contents: read
 
 jobs:
   update:
+    permissions:
+      contents: write # for Git to git push
+
     if: ${{ github.event_name != 'schedule' || github.repository == 'ruby/ruby' }}
+
     name: update ${{ github.workflow }}
+
     runs-on: ubuntu-latest
+
     steps:
-      - name: git config
-        run: |
-          git config --global advice.detachedHead 0
-          git config --global init.defaultBranch garbage
+      - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
+        with:
+          token: ${{ (github.repository == 'ruby/ruby' && !startsWith(github.event_name, 'pull')) && secrets.MATZBOT_AUTO_UPDATE_TOKEN || secrets.GITHUB_TOKEN }}
+
+      - uses: ./.github/actions/setup/directories
+        with:
+          # Skip overwriting MATZBOT_AUTO_UPDATE_TOKEN
+          checkout: '' # false (ref: https://github.com/actions/runner/issues/2238)
 
       - name: Set ENV
         run: |
-          echo "GNUMAKEFLAGS=-j$((1 + $(nproc --all)))" >> $GITHUB_ENV
           echo "TODAY=$(date +%F)" >> $GITHUB_ENV
 
-      - uses: actions/checkout@v3
-
-      - uses: actions/cache@v3
-        with:
-          path: .downloaded-cache
-          key: downloaded-cache-${{ github.sha }}
-          restore-keys: |
-            downloaded-cache
-
       - name: Download previous gems list
         run: |
-          data=bundled_gems.json
           mkdir -p .downloaded-cache
-          ln -s .downloaded-cache/$data .
-          curl -O -R -z ./$data https://stdgems.org/$data
+          for data in bundled_gems.json default_gems.json; do
+            ln -s .downloaded-cache/$data .
+            curl -O -R -z ./$data https://stdgems.org/$data
+          done
 
       - name: Update bundled gems list
+        id: bundled_gems
         run: |
-          ruby -i~ tool/update-bundled_gems.rb gems/bundled_gems
+          ruby -i~ tool/update-bundled_gems.rb gems/bundled_gems >> $GITHUB_OUTPUT
+        if: ${{ env.UPDATE_ENABLED == 'true' }}
+
+      - name: Update spec/bundler/support/builders.rb
+        run: |
+          #!ruby
+          rake_version = File.read("gems/bundled_gems")[/^rake\s+(\S+)/, 1]
+          print ARGF.read.sub(/^ *def rake_version\s*\K".*?"/) {rake_version.dump}
+        shell: ruby -i~ {0} spec/bundler/support/builders.rb
+        if: ${{ env.UPDATE_ENABLED == 'true' }}
 
       - name: Maintain updated gems list in NEWS
         run: |
-          require 'json'
-          news = File.read("NEWS.md")
-          prev = news[/since the \*+(\d+\.\d+\.\d+)\*+/, 1]
-          prevs = [prev, prev.sub(/\.\d+\z/, '')]
-          %W[bundled].each do |type|
-            last = JSON.parse(File.read("#{type}_gems.json"))['gems'].filter_map do |g|
-              v = g['versions'].values_at(*prevs).compact.first
-              g = g['gem']
-              g = 'RubyGems' if g == 'rubygems'
-              [g, v] if v
-            end.to_h
-            changed = File.foreach("gems/#{type}_gems").filter_map do |l|
-              next if l.start_with?("#")
-              g, v = l.split(" ", 3)
-              [g, v] unless last[g] == v
-            end
-            changed, added = changed.partition {|g, _| last[g]}
-            news.sub!(/^\*( +)The following #{type} gems? are updated\.\n\K(?: \1\* .*\n)*/) do
-              mark = "#{$1} * "
-              changed.map {|g, v|"#{mark}#{g} #{v}\n"}.join("")
-            end or next
-            news.sub!(/^\*( +)The following default gems are now bundled gems\.\n\K(?: \1\* .*\n)*/) do
-              mark = "#{$1} * "
-              added.map {|g, v|"#{mark}#{g} #{v}\n"}.join("")
-            end or next if added
-            File.write("NEWS.md", news)
-          end
-        shell: ruby {0}
+          ruby tool/update-NEWS-gemlist.rb bundled
+        if: ${{ env.UPDATE_ENABLED == 'true' }}
 
       - name: Check diffs
         id: diff
         run: |
-          git add -- NEWS.md
-          git diff --no-ext-diff --ignore-submodules --quiet -- gems/bundled_gems
-        continue-on-error: true
+          news= gems=
+          git diff --color --no-ext-diff --ignore-submodules --exit-code -- NEWS.md ||
+          news=true
+          git diff --color --no-ext-diff --ignore-submodules --exit-code -- gems/bundled_gems ||
+          gems=true
+          git add -- NEWS.md gems/bundled_gems
+          git add -- spec/bundler/support/builders.rb
+          echo news=$news >> $GITHUB_OUTPUT
+          echo gems=$gems >> $GITHUB_OUTPUT
+          echo update=${news:-$gems} >> $GITHUB_OUTPUT
 
-      - name: Install libraries
+      - name: Commit
+        id: commit
+        run: |
+          git pull --ff-only origin ${GITHUB_REF#refs/heads/}
+          message="Update bundled gems list"
+          if [ -z "${gems}" ]; then
+            git commit --message="[DOC] ${message} at ${GITHUB_SHA:0:30}"
+          else
+            git commit --message="${message} as of ${TODAY}"
+          fi
+        env:
+          TODAY: ${{ steps.bundled_gems.outputs.latest_date || env.TODAY }}
+          EMAIL: svn-admin@ruby-lang.org
+          GIT_AUTHOR_NAME: git
+          GIT_COMMITTER_NAME: git
+          gems: ${{ steps.diff.outputs.gems }}
+        if: ${{ steps.diff.outputs.update }}
+
+      - name: Development revision of bundled gems
         run: |
-          set -x
-          sudo apt-get update -q || :
-          sudo apt-get install --no-install-recommends -q -y build-essential libssl-dev libyaml-dev libreadline6-dev zlib1g-dev libncurses5-dev libffi-dev bison autoconf ruby
-        if: ${{ steps.diff.outcome == 'failure' }}
+          #!ruby
+          file = "gems/bundled_gems"
+
+          SECONDS_IN_DAY = 86400
+          today = Time.new("#{ENV['TODAY']}Z")
+          if !(december = today.month == 12)
+            days = 30
+          elsif (days = 26 - today.day).positive?
+            days += 4
+          else
+            puts "::info:: just after released"
+            exit
+          end
+
+          since = "#{today.year-1}-12-26"
+          ref = ENV['GITHUB_REF']
+          puts "::group::\e[94mfetching \e[1m#{file}\e[22m since \e[1m#{since}\e[22m from \e[1m#{ref}\e[m"
+          system(*%W[git fetch --shallow-since=#{since} --no-tags origin #{ref}], exception: true)
+          puts "::endgroup::"
+
+          puts "\e[94mchecking development version bundled gems older than \e[1m#{days}\e[22m days\e[m"
+          limit = today.to_i - days * SECONDS_IN_DAY
+          old = 0
+          IO.popen(%W"git blame --line-porcelain -- #{file}") do |blame|
+            while head = blame.gets("\n\t") and s = blame.gets
+              next unless (gem = s.split(/\s+|#.*/)).size > 3
+              time = head[/^committer-time \K\d+/].to_i
+              next if (d = limit - time) <= 0
+              d /= SECONDS_IN_DAY
+              line = head[/\A\h+ \d+ \K\d+/].to_i
+              level = if d < days; 'warning'; else old += 1; 'error'; end
+              d += days
+              puts "::#{level} file=#{file},line=#{line},title=Older than #{d} days::#{gem[0]} #{gem[3]}"
+            end
+          end
+          abort "::error title=Too long-standing gems::The release comes soon." if december and old.nonzero?
+        shell: ruby {0}
+        env:
+          file: ${{ steps.logs.outputs.file }}
+          days: ${{ steps.logs.outputs.days }}
+
+      - name: Install libraries
+        uses: ./.github/actions/setup/ubuntu
+        if: ${{ steps.diff.outputs.gems }}
 
       - name: Build
         run: |
           ./autogen.sh
           ./configure -C --disable-install-doc
           make
-        if: ${{ steps.diff.outcome == 'failure' }}
+        if: ${{ steps.diff.outputs.gems }}
+
+      - name: Prepare bundled gems
+        run: |
+          make -s prepare-gems
+        if: ${{ steps.diff.outputs.gems }}
 
       - name: Test bundled gems
         run: |
           make -s test-bundled-gems
-          git add -- gems/bundled_gems
         timeout-minutes: 30
         env:
-          RUBY_TESTOPTS: "-q --tty=no"
-          TEST_BUNDLED_GEMS_ALLOW_FAILURES: ""
-        if: ${{ steps.diff.outcome == 'failure' }}
-
-      - name: Show diffs
-        id: show
-        run: |
-          git diff --cached --color --no-ext-diff --ignore-submodules --exit-code --
-        continue-on-error: true
+          RUBY_TESTOPTS: '-q --tty=no'
+          TEST_BUNDLED_GEMS_ALLOW_FAILURES: ''
+        if: ${{ steps.diff.outputs.gems }}
 
-      - name: Commit
+      - name: Push
         run: |
-          git pull --ff-only origin ${GITHUB_REF#refs/heads/}
-          message="Update bundled gems list at "
-          if [ ${{ steps.diff.outcome }} = success ]; then
-            git commit --message="${message}${GITHUB_SHA:0:30} [ci skip]"
-          else
-            git commit --message="${message}${TODAY}"
-          fi
           git push origin ${GITHUB_REF#refs/heads/}
-        env:
-          EMAIL: svn-admin@ruby-lang.org
-          GIT_AUTHOR_NAME: git
-          GIT_COMMITTER_NAME: git
-        if: ${{ github.repository == 'ruby/ruby' && !startsWith(github.event_name, 'pull') && steps.show.outcome == 'failure' }}
+        if: >-
+          ${{
+          github.repository == 'ruby/ruby' &&
+          !startsWith(github.event_name, 'pull') &&
+          steps.commit.outcome == 'success'
+          }}
+
+      - uses: ./.github/actions/slack
+        with:
+          SLACK_WEBHOOK_URL: ${{ secrets.SIMPLER_ALERTS_URL }} # ruby-lang slack: ruby/simpler-alerts-bot
+        if: ${{ failure() }}
diff --git a/.github/workflows/check_dependencies.yml b/.github/workflows/check_dependencies.yml
index f606a86b66..c5dec65e48 100644
--- a/.github/workflows/check_dependencies.yml
+++ b/.github/workflows/check_dependencies.yml
@@ -3,63 +3,57 @@ on:
   push:
     paths-ignore:
       - 'doc/**'
+      - '**/man/*'
       - '**.md'
       - '**.rdoc'
+      - '**/.document'
+      - '.*.yml'
   pull_request:
-    paths-ignore:
-      - 'doc/**'
-      - '**.md'
-      - '**.rdoc'
+  merge_group:
 
 concurrency:
   group: ${{ github.workflow }} / ${{ startsWith(github.event_name, 'pull') && github.ref_name || github.sha }}
   cancel-in-progress: ${{ startsWith(github.event_name, 'pull') }}
 
+permissions:
+  contents: read
+
 jobs:
   update-deps:
+    name: Dependency checks
+
     strategy:
       matrix:
-        os: [ubuntu-20.04]
+        os: [ubuntu-latest]
       fail-fast: true
+
     runs-on: ${{ matrix.os }}
-    if: ${{ !startsWith(github.event.head_commit.message, '[DOC]') && !contains(github.event.pull_request.labels.*.name, 'Documentation') }}
+
     steps:
-      - name: Install libraries
-        run: |
-          set -x
-          sudo apt-get update -q || :
-          sudo apt-get install --no-install-recommends -q -y build-essential libssl-dev libyaml-dev libreadline6-dev zlib1g-dev libncurses5-dev libffi-dev bison autoconf ruby
+      - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
+
+      - uses: ./.github/actions/setup/ubuntu
         if: ${{ contains(matrix.os, 'ubuntu') }}
-      - name: Install libraries
-        run: |
-          brew upgrade
-          brew install gmp libffi openssl@1.1 zlib autoconf automake libtool readline
+
+      - uses: ./.github/actions/setup/macos
         if: ${{ contains(matrix.os, 'macos') }}
-      - name: git config
-        run: |
-          git config --global advice.detachedHead 0
-          git config --global init.defaultBranch garbage
-      - uses: actions/checkout@v3
-      - uses: actions/cache@v3
+
+      - uses: ./.github/actions/setup/directories
+
+      - uses: ruby/setup-ruby@b90be12699fdfcbee4440c2bba85f6f460446bb0 # v1.279.0
         with:
-          path: .downloaded-cache
-          key: downloaded-cache
-      - run: ./autogen.sh
+          ruby-version: '3.1'
+          bundler: none
+
       - name: Run configure
         run: ./configure -C --disable-install-doc --disable-rubygems --with-gcc 'optflags=-O0' 'debugflags=-save-temps=obj -g'
-      - run: make all golf
-      - run: ruby tool/update-deps --fix
+
+      - run: make fix-depends
+
       - run: git diff --no-ext-diff --ignore-submodules --exit-code
-      - uses: k0kubun/action-slack@v2.0.0
+
+      - uses: ./.github/actions/slack
         with:
-          payload: |
-            {
-              "ci": "GitHub Actions",
-              "env": "${{ matrix.os }} / Dependencies need to update",
-              "url": "https://github.com/${{ github.repository }}/actions/runs/${{ github.run_id }}",
-              "commit": "${{ github.sha }}",
-              "branch": "${{ github.ref }}".split('/').reverse()[0]
-            }
-        env:
+          label: ${{ matrix.os }} / Dependencies need to update
           SLACK_WEBHOOK_URL: ${{ secrets.SIMPLER_ALERTS_URL }} # ruby-lang slack: ruby/simpler-alerts-bot
-        if: ${{ failure() && github.event_name == 'push' }}
+        if: ${{ failure() }}
diff --git a/.github/workflows/check_misc.yml b/.github/workflows/check_misc.yml
index 9e35d7f432..2a2bd1df53 100644
--- a/.github/workflows/check_misc.yml
+++ b/.github/workflows/check_misc.yml
@@ -1,97 +1,127 @@
-name: Miscellaneous checks
-on: [push, pull_request]
+name: Misc
+on: [push, pull_request, merge_group]
 
 concurrency:
   group: ${{ github.workflow }} / ${{ startsWith(github.event_name, 'pull') && github.ref_name || github.sha }}
   cancel-in-progress: ${{ startsWith(github.event_name, 'pull') }}
 
+permissions:
+  contents: read
+
 jobs:
   checks:
+    name: Miscellaneous checks
+
+    permissions:
+      contents: write # for Git to git push
+
     runs-on: ubuntu-latest
+
     steps:
-      - uses: actions/checkout@v3
-      - name: Check if C-sources are US-ASCII
+      - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
+        with:
+          token: ${{ (github.repository == 'ruby/ruby' && !startsWith(github.event_name, 'pull')) && secrets.MATZBOT_AUTO_UPDATE_TOKEN || secrets.GITHUB_TOKEN }}
+
+      - uses: ./.github/actions/setup/directories
+        with:
+          makeup: true
+          # Skip overwriting MATZBOT_AUTO_UPDATE_TOKEN
+          checkout: '' # false (ref: https://github.com/actions/runner/issues/2238)
+
+      - name: Check for code styles
         run: |
-          ! grep -r -n '[^	 -~]' *.[chy] include internal win32/*.[ch]
-      - name: Check for trailing spaces
+          set -x
+          ruby tool/auto-style.rb "$GITHUB_OLD_SHA" "$GITHUB_NEW_SHA"
+        env:
+          GITHUB_OLD_SHA: ${{ github.event.pull_request.base.sha }}
+          GITHUB_NEW_SHA: ${{ github.event.pull_request.merge_commit_sha }}
+        # Skip 'push' events because post_push.yml fixes them on push
+        if: ${{ github.repository == 'ruby/ruby' && startsWith(github.event_name, 'pull') }}
+
+      - name: Check for bash specific substitution in configure.ac
         run: |
-          ! git grep -n '[	 ]$' '*.rb' '*.[chy]'
+          git grep -n '\${[A-Za-z_0-9]*/' -- configure.ac && exit 1 || :
+
       - name: Check for header macros
         run: |
-          ! for header in ruby/*.h; do \
-            git grep -l -F -e $header -e HAVE_`echo $header | tr a-z./ A-Z__` -- . > /dev/null || echo $header
-          done | grep -F .
+          fail=
+          for header in ruby/*.h; do
+            git grep -l -F -e $header -e HAVE_`echo $header | tr a-z./ A-Z__` -- . > /dev/null && continue
+            fail=1
+            echo $header
+          done
+          exit $fail
         working-directory: include
 
-      - uses: actions/cache@v3
-        with:
-          path: .downloaded-cache
-          key: downloaded-cache-${{ github.sha }}
-          restore-keys: |
-            downloaded-cache
+      - id: now
+        run: |
+          date +"mon=%-m"%n"day=%-d" >> $GITHUB_OUTPUT
+        env:
+          TZ: Tokyo/Asia
 
-      - name: Download previous gems list
+      - id: deprecation
         run: |
-          data=default_gems.json
-          mkdir -p .downloaded-cache
-          ln -s .downloaded-cache/$data .
-          curl -O -R -z ./$data https://stdgems.org/$data
+          eval $(sed -n 's/^#define RUBY_API_VERSION_\(MAJOR\|MINOR\) /\1=/p' include/ruby/version.h)
+          if git --no-pager grep --color -o 'rb_warn_deprecated_to_remove_at('$MAJOR'\.'$MINOR',.*' -- '*.c' >&2; then
+              false
+          else
+              true
+          fi
+        continue-on-error: ${{ steps.now.outputs.mon < 12 }}
 
-      - name: Make default gems list
+      - name: Check if to generate documents
+        id: rdoc
         run: |
-          require 'rubygems'
-          $:.unshift "lib"
-          rgver = File.foreach("lib/rubygems.rb") do |line|
-            break $1 if /^\s*VERSION\s*=\s*"([^"]+)"/ =~ line
-          end
-          gems = Dir.glob("{ext,lib}/**/*.gemspec").map do |f|
-            spec = Gem::Specification.load(f)
-            "#{spec.name} #{spec.version}"
-          end.sort
-          File.open("gems/default_gems", "w") do |f|
-            f.puts "RubyGems #{rgver}"
-            f.puts gems
-          end
-        shell: ruby --disable=gems {0}
-
-      - name: Maintain updated gems list in NEWS
+          set -- $(sed 's/#.*//;/^rdoc /!d' gems/bundled_gems)
+          { echo version=$2; echo ref=$4; } >> $GITHUB_OUTPUT
+          echo RDOC='ruby -W0 --disable-gems tool/rdoc-srcdir -q' >> $GITHUB_ENV
+
+      - name: Checkout rdoc
+        uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
+        with:
+          repository: ruby/rdoc
+          ref: ${{ steps.rdoc.outputs.ref }}
+          path: .bundle/gems/rdoc-${{ steps.rdoc.outputs.version }}
+        if: ${{ steps.rdoc.outputs.ref != '' }}
+
+      - name: Generate rdoc
         run: |
-          require 'json'
-          news = File.read("NEWS.md")
-          prev = news[/since the \*+(\d+\.\d+\.\d+)\*+/, 1]
-          prevs = [prev, prev.sub(/\.\d+\z/, '')]
-          %W[default].each do |type|
-            last = JSON.parse(File.read("#{type}_gems.json"))['gems'].filter_map do |g|
-              v = g['versions'].values_at(*prevs).compact.first
-              g = g['gem']
-              g = 'RubyGems' if g == 'rubygems'
-              [g, v] if v
-            end.to_h
-            changed = File.foreach("gems/#{type}_gems").filter_map do |l|
-              next if l.start_with?("#")
-              g, v = l.split(" ", 3)
-              [g, v] unless last[g] == v
-            end
-            news.sub!(/^\*( +)The following #{type} gems? are updated\.\n\K(?: \1\* .*\n)*/) do
-              mark = "#{$1} * "
-              changed.map {|g, v|"#{mark}#{g} #{v}\n"}.join("")
-            end or next
-            File.write("NEWS.md", news)
-          end
-        shell: ruby {0}
-
-      - name: Check diffs
-        id: diff
+          set -x
+          gempath=$(ruby -e 'print Gem.user_dir, "/bin"')
+          PATH=$gempath:$PATH
+          gem install --user bundler
+          bundle config --local path vendor/bundle
+          bundle install --jobs 4
+          bundle exec rake generate
+        working-directory: .bundle/gems/rdoc-${{ steps.rdoc.outputs.version }}
+        if: ${{ steps.rdoc.outputs.ref != '' }}
+
+      - name: Core docs coverage
         run: |
-          git diff --color --no-ext-diff --ignore-submodules --exit-code NEWS.md
-        continue-on-error: true
-      - name: Commit
+          $RDOC -C -x ^ext -x ^lib .
+
+      - name: Generate docs
+        id: docs
         run: |
-          git pull --ff-only origin ${GITHUB_REF#refs/heads/}
-          git commit --message="Update default gems list at ${GITHUB_SHA:0:30} [ci skip]" NEWS.md
-          git push origin ${GITHUB_REF#refs/heads/}
-        env:
-          EMAIL: svn-admin@ruby-lang.org
-          GIT_AUTHOR_NAME: git
-          GIT_COMMITTER_NAME: git
-        if: ${{ github.repository == 'ruby/ruby' && !startsWith(github.event_name, 'pull') && steps.diff.outcome == 'failure' }}
+          $RDOC --op html .
+          echo htmlout=ruby-html-${GITHUB_SHA:0:10} >> $GITHUB_OUTPUT
+        # Generate only when document commit/PR
+        if: >-
+          ${{false
+          || contains(github.event.head_commit.message, '[ruby/rdoc]')
+          || contains(github.event.head_commit.message, '[DOC]')
+          || contains(github.event.pull_request.title, '[DOC]')
+          || contains(github.event.pull_request.labels.*.name, 'Documentation')
+          }}
+
+      - name: Upload docs
+        uses: actions/upload-artifact@v6.0.0
+        with:
+          path: html
+          name: ${{ steps.docs.outputs.htmlout }}
+        if: ${{ steps.docs.outcome == 'success' }}
+
+      - uses: ./.github/actions/slack
+        with:
+          SLACK_WEBHOOK_URL: ${{ secrets.SIMPLER_ALERTS_URL }} # ruby-lang slack: ruby/simpler-alerts-bot
+        if: ${{ failure() }}
diff --git a/.github/workflows/codeql-analysis.yml b/.github/workflows/codeql-analysis.yml
index 09d9135fa0..a92c93b476 100644
--- a/.github/workflows/codeql-analysis.yml
+++ b/.github/workflows/codeql-analysis.yml
@@ -1,61 +1,121 @@
-name: "Code scanning - action"
+name: 'CodeQL'
 
 on:
   push:
+    branches: ['master']
     paths-ignore:
       - 'doc/**'
+      - '**/man/*'
       - '**.md'
       - '**.rdoc'
+      - '**/.document'
+      - '.*.yml'
   pull_request:
     paths-ignore:
       - 'doc/**'
+      - '**/man/*'
       - '**.md'
       - '**.rdoc'
+      - '**/.document'
+      - '.*.yml'
   schedule:
-    - cron: '0 12 * * 4'
+    - cron: '0 12 * * *'
+  workflow_dispatch:
 
 concurrency:
   group: ${{ github.workflow }} / ${{ startsWith(github.event_name, 'pull') && github.ref_name || github.sha }}
   cancel-in-progress: ${{ startsWith(github.event_name, 'pull') }}
 
-jobs:
-  CodeQL-Build:
+permissions: # added using https://github.com/step-security/secure-workflows
+  contents: read
 
-    # CodeQL runs on ubuntu-latest and windows-latest
+jobs:
+  analyze:
+    name: Analyze
     runs-on: ubuntu-latest
-    if: ${{ !startsWith(github.event.head_commit.message, '[DOC]') && !contains(github.event.pull_request.labels.*.name, 'Documentation') }}
+    permissions:
+      actions: read # for github/codeql-action/init to get workflow details
+      contents: read # for actions/checkout to fetch code
+      security-events: write # for github/codeql-action/autobuild to send a status report
+    # CodeQL fails to run pull requests from dependabot due to missing write access to upload results.
+    if: >-
+      ${{!(false
+      || contains(github.event.head_commit.message, '[DOC]')
+      || contains(github.event.pull_request.title, '[DOC]')
+      || contains(github.event.pull_request.labels.*.name, 'Documentation')
+      || (github.event_name == 'push' && github.event.pull_request.user.login == 'dependabot[bot]')
+      )}}
 
     env:
       enable_install_doc: no
 
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - language: cpp
+          - language: ruby
+
     steps:
-    - name: Install libraries
-      run: |
-        set -x
-        sudo apt-get update -q || :
-        sudo apt-get install --no-install-recommends -q -y build-essential libssl-dev libyaml-dev libreadline6-dev zlib1g-dev libncurses5-dev libffi-dev bison autoconf ruby
+      - name: Checkout repository
+        uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
+
+      - name: Install libraries
+        if: ${{ contains(matrix.os, 'macos') }}
+        uses: ./.github/actions/setup/macos
+
+      - name: Install libraries
+        if : ${{ matrix.os == 'ubuntu-latest' }}
+        uses: ./.github/actions/setup/ubuntu
 
-    - name: Checkout repository
-      uses: actions/checkout@v3
+      - uses: ./.github/actions/setup/directories
 
-    - uses: actions/cache@v3
-      with:
-        path: .downloaded-cache
-        key: downloaded-cache
+      - name: Remove an obsolete rubygems vendored file
+        if: ${{ matrix.os == 'ubuntu-latest' }}
+        run: sudo rm /usr/lib/ruby/vendor_ruby/rubygems/defaults/operating_system.rb
 
-    - name: Remove an obsolete rubygems vendored file
-      run: sudo rm /usr/lib/ruby/vendor_ruby/rubygems/defaults/operating_system.rb
+      - name: Initialize CodeQL
+        uses: github/codeql-action/init@e296a935590eb16afc0c0108289f68c87e2a89a5 # v4.30.7
+        with:
+          languages: ${{ matrix.language }}
+          trap-caching: false
+          debug: true
 
-    - name: Initialize CodeQL
-      uses: github/codeql-action/init@v2
-      with:
-        config-file: ./.github/codeql/codeql-config.yml
+      - name: Autobuild
+        uses: github/codeql-action/autobuild@e296a935590eb16afc0c0108289f68c87e2a89a5 # v4.30.7
 
-    - name: Set ENV
-      run: echo "GNUMAKEFLAGS=-j$((1 + $(nproc --all)))" >> $GITHUB_ENV
+      - name: Perform CodeQL Analysis
+        uses: github/codeql-action/analyze@e296a935590eb16afc0c0108289f68c87e2a89a5 # v4.30.7
+        with:
+          category: '/language:${{ matrix.language }}'
+          upload: False
+          output: sarif-results
 
-    - name: Autobuild
-      uses: github/codeql-action/autobuild@v2
+      - name: filter-sarif
+        uses: advanced-security/filter-sarif@f3b8118a9349d88f7b1c0c488476411145b6270d # v1.0.1
+        with:
+          patterns: |
+            +**/*.rb
+            -lib/uri/mailto.rb:rb/overly-large-range
+            -lib/uri/rfc3986_parser.rb:rb/overly-large-range
+            -lib/bundler/vendor/uri/lib/uri/mailto.rb:rb/overly-large-range
+            -lib/bundler/vendor/uri/lib/uri/rfc3986_parser.rb:rb/overly-large-range
+            -test/ruby/test_io.rb:rb/non-constant-kernel-open
+            -test/open-uri/test_open-uri.rb:rb/non-constant-kernel-open
+            -test/open-uri/test_ssl.rb:rb/non-constant-kernel-open
+            -spec/ruby/core/io/binread_spec.rb:rb/non-constant-kernel-open
+            -spec/ruby/core/io/readlines_spec.rb:rb/non-constant-kernel-open
+            -spec/ruby/core/io/foreach_spec.rb:rb/non-constant-kernel-open
+            -spec/ruby/core/io/write_spec.rb:rb/non-constant-kernel-open
+            -spec/ruby/core/io/read_spec.rb:rb/non-constant-kernel-open
+            -spec/ruby/core/kernel/open_spec.rb:rb/non-constant-kernel-open
+          input: sarif-results/${{ matrix.language }}.sarif
+          output: sarif-results/${{ matrix.language }}.sarif
+        if: ${{ matrix.language == 'ruby' }}
+        continue-on-error: true
 
-    - name: Perform CodeQL Analysis
-      uses: github/codeql-action/analyze@v2
+      - name: Upload SARIF
+        uses: github/codeql-action/upload-sarif@e296a935590eb16afc0c0108289f68c87e2a89a5 # v4.30.7
+        with:
+          sarif_file: sarif-results/${{ matrix.language }}.sarif
+        continue-on-error: true
diff --git a/.github/workflows/compilers.yml b/.github/workflows/compilers.yml
index 128b53c208..8c0ca54e0b 100644
--- a/.github/workflows/compilers.yml
+++ b/.github/workflows/compilers.yml
@@ -1,255 +1,334 @@
+# Some tests depending on this name 'Compilations' via $GITHUB_WORKFLOW. Make sure to update such tests when renaming this workflow.
 name: Compilations
 
 on:
   push:
     paths-ignore:
       - 'doc/**'
+      - '**/man/*'
       - '**.md'
       - '**.rdoc'
+      - '**/.document'
+      - '.*.yml'
   pull_request:
     paths-ignore:
       - 'doc/**'
+      - '**/man/*'
       - '**.md'
       - '**.rdoc'
+      - '**/.document'
+      - '.*.yml'
+  merge_group:
 
 concurrency:
   group: ${{ github.workflow }} / ${{ startsWith(github.event_name, 'pull') && github.ref_name || github.sha }}
   cancel-in-progress: ${{ startsWith(github.event_name, 'pull') }}
 
-# GitHub actions does not support YAML anchors.  This creative use of
-# environment variables (plus the "echo $GITHUB_ENV" hack) is to reroute that
-# restriction.
-env:
-  default_cc: clang-14
-  append_cc: ''
-  crosshost: ''
-
-  # -O1 is faster than -O3 in our tests... Majority of time are consumed trying
-  # to optimize binaries.  Also GitHub Actions run on relatively modern CPUs
-  # compared to, say, GCC 4 or Clang 3.  We don't specify `-march=native`
-  # because compilers tend not understand what the CPU is.
-  optflags: '-O1'
-
-  # -g0 disables backtraces when SEGV.  Do not set that.
-  debugflags: '-ggdb3'
-
-  default_configure: >-
-    --enable-debug-env
-    --disable-install-doc
-    --with-ext=-test-/cxxanyargs,+
-  append_configure: >-
-    --without-valgrind
-    --without-jemalloc
-    --without-gmp
-
-  UPDATE_UNICODE: >-
-    UNICODE_FILES=.
-    UNICODE_PROPERTY_FILES=.
-    UNICODE_AUXILIARY_FILES=.
-    UNICODE_EMOJI_FILES=.
-  CONFIGURE_TTY: never
-  GITPULLOPTIONS: --no-tags origin ${{github.ref}}
-  RUBY_DEBUG: ci rgengc
-  RUBY_TESTOPTS: >-
-    -q
-    --color=always
-    --tty=no
+permissions:
+  contents: read
 
+# Each job is split so that they roughly take 30min to run through.
 jobs:
-  compile:
-    strategy:
-      fail-fast: false
-      matrix:
-        entry:
-          - { key: default_cc, name: gcc-11,    value: gcc-11,    container: gcc-11 }
-          - { key: default_cc, name: gcc-10,    value: gcc-10,    container: gcc-10 }
-          - { key: default_cc, name: gcc-9,     value: gcc-9,     container: gcc-9 }
-          - { key: default_cc, name: gcc-8,     value: gcc-8,     container: gcc-8 }
-          - { key: default_cc, name: gcc-7,     value: gcc-7,     container: gcc-7 }
-          - { key: default_cc, name: gcc-6,     value: gcc-6,     container: gcc-6 }
-          - { key: default_cc, name: gcc-5,     value: gcc-5,     container: gcc-5 }
-          - { key: default_cc, name: gcc-4.8,   value: gcc-4.8,   container: gcc-4.8 }
-          - key: default_cc
-            name: 'gcc-11 LTO'
-            value: 'gcc-11 -flto=auto -ffat-lto-objects'
-            container: gcc-11
-            configure_append: '--disable-shared optflags=-O2'
-            # check: true
-          - { key: default_cc, name: clang-15,  value: clang-15,  container: clang-15 }
-          - { key: default_cc, name: clang-14,  value: clang-14,  container: clang-14 }
-          - { key: default_cc, name: clang-13,  value: clang-13,  container: clang-13 }
-          - { key: default_cc, name: clang-12,  value: clang-12,  container: clang-12 }
-          - { key: default_cc, name: clang-11,  value: clang-11,  container: clang-11 }
-          - { key: default_cc, name: clang-10,  value: clang-10,  container: clang-10 }
-          - { key: default_cc, name: clang-9,   value: clang-9,   container: clang-9 }
-          - { key: default_cc, name: clang-8,   value: clang-8,   container: clang-8 }
-          - { key: default_cc, name: clang-7,   value: clang-7,   container: clang-7 }
-          - { key: default_cc, name: clang-6.0, value: clang-6.0, container: clang-6.0 }
-          - { key: default_cc, name: clang-5.0, value: clang-5.0, container: clang-5.0 }
-          - { key: default_cc, name: clang-4.0, value: clang-4.0, container: clang-4.0 }
-          - { key: default_cc, name: clang-3.9, value: clang-3.9, container: clang-3.9 }
-          - key: default_cc
-            name: 'clang-14 LTO'
-            value: 'clang-14 -flto=auto'
-            container: clang-14
-            configure_append: '--disable-shared optflags=-O2'
-            # check: true
-
-#         - { key: crosshost, name: aarch64-linux-gnu,     value: aarch64-linux-gnu, container: crossbuild-essential-arm64 }
-#         - { key: crosshost, name: arm-linux-gnueabi,     value: arm-linux-gnueabi }
-#         - { key: crosshost, name: arm-linux-gnueabihf,   value: arm-linux-gnueabihf }
-#         - { key: crosshost, name: i686-w64-mingw32,      value: i686-w64-mingw32 }
-#         - { key: crosshost, name: powerpc-linux-gnu,     value: powerpc-linux-gnu }
-#         - { key: crosshost, name: powerpc64le-linux-gnu, value: powerpc64le-linux-gnu, container: crossbuild-essential-ppc64el }
-#         - { key: crosshost, name: s390x-linux-gnu,       value: s390x-linux-gnu, container: crossbuild-essential-s390x }
-#         - { key: crosshost, name: x86_64-w64-mingw32,    value: x86_64-w64-mingw32, container: mingw-w64 }
-
-          # -Wno-strict-prototypes is necessary with current clang-15 since
-          # older autoconf generate functions without prototype and -pedantic
-          # now implies strict-prototypes. Disabling the error but leaving the
-          # warning generates a lot of noise from use of ANYARGS in
-          # rb_define_method() and friends.
-          # See: https://github.com/llvm/llvm-project/commit/11da1b53d8cd3507959022cd790d5a7ad4573d94
-          - { key: append_cc, name: c99,   value: '-std=c99   -Werror=pedantic -pedantic-errors -Wno-strict-prototypes' }
-#         - { key: append_cc, name: c11,   value: '-std=c11   -Werror=pedantic -pedantic-errors -Wno-strict-prototypes' }
-#         - { key: append_cc, name: c17,   value: '-std=c17   -Werror=pedantic -pedantic-errors -Wno-strict-prototypes' }
-          - { key: append_cc, name: c2x,   value: '-std=c2x   -Werror=pedantic -pedantic-errors -Wno-strict-prototypes' }
-          - { key: CXXFLAGS,  name: c++98, value: '-std=c++98 -Werror=pedantic -pedantic-errors -Wno-c++11-long-long' }
-#         - { key: CXXFLAGS,  name: c++11, value: '-std=c++11 -Werror=pedantic -pedantic-errors -Wno-c++11-long-long' }
-#         - { key: CXXFLAGS,  name: c++14, value: '-std=c++14 -Werror=pedantic -pedantic-errors -Wno-c++11-long-long' }
-#         - { key: CXXFLAGS,  name: c++17, value: '-std=c++17 -Werror=pedantic -pedantic-errors -Wno-c++11-long-long' }
-          - { key: CXXFLAGS,  name: c++2a, value: '-std=c++2a -Werror=pedantic -pedantic-errors -Wno-c++11-long-long' }
-
-          - { key: optflags, name: '-O0', value: '-O0 -march=x86-64 -mtune=generic' }
-#         - { key: optflags, name: '-O3', value: '-O3 -march=x86-64 -mtune=generic', check: true }
-
-          - { key: append_configure, name: gmp,                  value: '--with-gmp' }
-          - { key: append_configure, name: jemalloc,             value: '--with-jemalloc' }
-          - { key: append_configure, name: valgrind,             value: '--with-valgrind' }
-          - { key: append_configure, name: 'coroutine=ucontext', value: '--with-coroutine=ucontext' }
-          - { key: append_configure, name: 'coroutine=pthread',  value: '--with-coroutine=pthread' }
-          - { key: append_configure, name: disable-jit-support,  value: '--disable-jit-support' }
-          - { key: append_configure, name: disable-dln,          value: '--disable-dln' }
-          - { key: append_configure, name: disable-rubygems,     value: '--disable-rubygems' }
+  compile-if:
+    name: 'omnibus compilations, trigger'
+    runs-on: ubuntu-latest
+    if: >-
+      ${{!(false
+      || contains(github.event.head_commit.message, '[DOC]')
+      || contains(github.event.pull_request.title, '[DOC]')
+      || contains(github.event.pull_request.labels.*.name, 'Documentation')
+      || (github.event_name == 'push' && github.event.pull_request.user.login == 'dependabot[bot]')
+      )}}
+    steps:
+      - run: true
+        working-directory:
 
-          - { key: cppflags, name: OPT_THREADED_CODE=1,            value: '-DOPT_THREADED_CODE=1' }
-          - { key: cppflags, name: OPT_THREADED_CODE=2,            value: '-DOPT_THREADED_CODE=2' }
-          - { key: cppflags, name: OPT_THREADED_CODE=3,            value: '-DOPT_THREADED_CODE=3' }
+  compile1:
+    name: 'omnibus compilations, #1'
+    runs-on: ubuntu-latest
+    needs: compile-if
+    if: ${{ needs.compile-if.result == 'success' }}
+    timeout-minutes: 60
+    services: { docuum: { image: 'stephanmisc/docuum', options: '--init', volumes: [ '/root', '/var/run/docker.sock:/var/run/docker.sock' ] } }
+    steps:
+      - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
+        with: { sparse-checkout-cone-mode: false, sparse-checkout: /.github }
+      # Set fetch-depth: 10 so that Launchable can receive commits information.
+      - { uses: './.github/actions/setup/directories', with: { srcdir: 'src', builddir: 'build', makeup: true, fetch-depth: 10 } }
+      - name: 'clang 18 LTO'
+        uses: './.github/actions/compilers'
+        with:
+          tag: clang-18
+          with_gcc: 'clang-18 -flto=auto'
+          optflags: '-O2'
+          enable_shared: false
+        timeout-minutes: 30
+      - { uses: './.github/actions/compilers', name: '-O0', with: { optflags: '-O0 -march=x86-64 -mtune=generic' }, timeout-minutes: 5 }
+      # - { uses: './.github/actions/compilers', name: '-O3', with: { optflags: '-O3 -march=x86-64 -mtune=generic', check: true } }
 
-          - { key: cppflags, name: NDEBUG,                         value: '-DNDEBUG' }
-          - { key: cppflags, name: RUBY_DEBUG,                     value: '-DRUBY_DEBUG' }
-#         - { key: cppflags, name: ARRAY_DEBUG,                    value: '-DARRAY_DEBUG' }
-#         - { key: cppflags, name: BIGNUM_DEBUG,                   value: '-DBIGNUM_DEBUG' }
-#         - { key: cppflags, name: CCAN_LIST_DEBUG,                value: '-DCCAN_LIST_DEBUG' }
-#         - { key: cppflags, name: CPDEBUG=-1,                     value: '-DCPDEBUG=-1' }
-#         - { key: cppflags, name: ENC_DEBUG,                      value: '-DENC_DEBUG' }
-#         - { key: cppflags, name: GC_DEBUG,                       value: '-DGC_DEBUG' }
-#         - { key: cppflags, name: HASH_DEBUG,                     value: '-DHASH_DEBUG' }
-#         - { key: cppflags, name: ID_TABLE_DEBUG,                 value: '-DID_TABLE_DEBUG' }
-#         - { key: cppflags, name: RGENGC_DEBUG=-1,                value: '-DRGENGC_DEBUG=-1' }
-#         - { key: cppflags, name: SYMBOL_DEBUG,                   value: '-DSYMBOL_DEBUG' }
-#         - { key: cppflags, name: THREAD_DEBUG=-1,                value: '-DTHREAD_DEBUG=-1' }
+  compile2:
+    name: 'omnibus compilations, #2'
+    runs-on: ubuntu-latest
+    needs: compile-if
+    if: ${{ needs.compile-if.result == 'success' }}
+    timeout-minutes: 60
+    services: { docuum: { image: 'stephanmisc/docuum', options: '--init', volumes: [ '/root', '/var/run/docker.sock:/var/run/docker.sock' ] } }
+    steps:
+      - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
+        with: { sparse-checkout-cone-mode: false, sparse-checkout: /.github }
+      - { uses: './.github/actions/setup/directories', with: { srcdir: 'src', builddir: 'build', makeup: true, fetch-depth: 10 } }
+      - name: 'GCC 15 LTO'
+        uses: './.github/actions/compilers'
+        with:
+          tag: gcc-15
+          with_gcc: 'gcc-15 -flto=auto -ffat-lto-objects -Werror=lto-type-mismatch'
+          optflags: '-O2'
+          enable_shared: false
+        timeout-minutes: 10
+      - { uses: './.github/actions/compilers', name: 'ext/Setup', with: { static_exts: 'etc json/* */escape' }, timeout-minutes: 5 }
+      - { uses: './.github/actions/compilers', name: 'GCC 15', with: { tag: 'gcc-15' }, timeout-minutes: 5 }
+      - { uses: './.github/actions/compilers', name: 'GCC 14', with: { tag: 'gcc-14' }, timeout-minutes: 5 }
+      - { uses: './.github/actions/compilers', name: 'GCC 13', with: { tag: 'gcc-13' }, timeout-minutes: 5 }
+      - { uses: './.github/actions/compilers', name: 'GCC 12', with: { tag: 'gcc-12' }, timeout-minutes: 5 }
+      - { uses: './.github/actions/compilers', name: 'GCC 11', with: { tag: 'gcc-11' }, timeout-minutes: 5 }
+      - { uses: './.github/actions/compilers', name: 'GCC 10', with: { tag: 'gcc-10' }, timeout-minutes: 5 }
+      - { uses: './.github/actions/compilers', name: 'GCC 9',  with: { tag: 'gcc-9'  }, timeout-minutes: 5 }
+      - { uses: './.github/actions/compilers', name: 'GCC 8',  with: { tag: 'gcc-8'  }, timeout-minutes: 5 }
+      - { uses: './.github/actions/compilers', name: 'GCC 7',  with: { tag: 'gcc-7'  }, timeout-minutes: 5 }
 
-#         - { key: cppflags, name: RGENGC_CHECK_MODE,              value: '-DRGENGC_CHECK_MODE' }
-#         - { key: cppflags, name: TRANSIENT_HEAP_CHECK_MODE,      value: '-DTRANSIENT_HEAP_CHECK_MODE' }
-#         - { key: cppflags, name: VM_CHECK_MODE,                  value: '-DVM_CHECK_MODE' }
+  compile3:
+    name: 'omnibus compilations, #3'
+    runs-on: ubuntu-latest
+    needs: compile-if
+    if: ${{ needs.compile-if.result == 'success' }}
+    timeout-minutes: 60
+    services: { docuum: { image: 'stephanmisc/docuum', options: '--init', volumes: [ '/root', '/var/run/docker.sock:/var/run/docker.sock' ] } }
+    steps:
+      - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
+        with: { sparse-checkout-cone-mode: false, sparse-checkout: /.github }
+      - { uses: './.github/actions/setup/directories', with: { srcdir: 'src', builddir: 'build', makeup: true, fetch-depth: 10 } }
+      - { uses: './.github/actions/compilers', name: 'clang 22', with: { tag: 'clang-22' }, timeout-minutes: 5 }
+      - { uses: './.github/actions/compilers', name: 'clang 21', with: { tag: 'clang-21' }, timeout-minutes: 5 }
+      - { uses: './.github/actions/compilers', name: 'clang 20', with: { tag: 'clang-20' }, timeout-minutes: 5 }
+      - { uses: './.github/actions/compilers', name: 'clang 19', with: { tag: 'clang-19' }, timeout-minutes: 5 }
+      - { uses: './.github/actions/compilers', name: 'clang 18', with: { tag: 'clang-18' }, timeout-minutes: 5 }
+      - { uses: './.github/actions/compilers', name: 'clang 17', with: { tag: 'clang-17' }, timeout-minutes: 5 }
+      - { uses: './.github/actions/compilers', name: 'clang 16', with: { tag: 'clang-16' }, timeout-minutes: 5 }
+      - { uses: './.github/actions/compilers', name: 'clang 15', with: { tag: 'clang-15' }, timeout-minutes: 5 }
+      - { uses: './.github/actions/compilers', name: 'clang 14', with: { tag: 'clang-14' }, timeout-minutes: 5 }
 
-          - { key: cppflags, name: USE_EMBED_CI=0,                 value: '-DUSE_EMBED_CI=0' }
-          - { key: cppflags, name: USE_FLONUM=0,                   value: '-DUSE_FLONUM=0' }
-#         - { key: cppflags, name: USE_GC_MALLOC_OBJ_INFO_DETAILS, value: '-DUSE_GC_MALLOC_OBJ_INFO_DETAILS' }
-          - { key: cppflags, name: USE_LAZY_LOAD,                  value: '-DUSE_LAZY_LOAD' }
-#         - { key: cppflags, name: USE_RINCGC=0,                   value: '-DUSE_RINCGC=0' }
-#         - { key: cppflags, name: USE_SYMBOL_GC=0,                value: '-DUSE_SYMBOL_GC=0' }
-#         - { key: cppflags, name: USE_THREAD_CACHE=0,             value: '-DUSE_THREAD_CACHE=0' }
-#         - { key: cppflags, name: USE_TRANSIENT_HEAP=0,           value: '-DUSE_TRANSIENT_HEAP=0' }
-#         - { key: cppflags, name: USE_RUBY_DEBUG_LOG=1,           value: '-DUSE_RUBY_DEBUG_LOG=1' }
-          - { key: cppflags, name: USE_RVARGC=0,                   value: '-DUSE_RVARGC=0' }
-#         - { key: cppflags, name: USE_RVARGC=1,                   value: '-DUSE_RVARGC=1' }
+  compile4:
+    name: 'omnibus compilations, #4'
+    runs-on: ubuntu-latest
+    needs: compile-if
+    if: ${{ needs.compile-if.result == 'success' }}
+    timeout-minutes: 60
+    services: { docuum: { image: 'stephanmisc/docuum', options: '--init', volumes: [ '/root', '/var/run/docker.sock:/var/run/docker.sock' ] } }
+    steps:
+      - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
+        with: { sparse-checkout-cone-mode: false, sparse-checkout: /.github }
+      - { uses: './.github/actions/setup/directories', with: { srcdir: 'src', builddir: 'build', makeup: true, fetch-depth: 10 } }
+      - { uses: './.github/actions/compilers', name: 'clang 13', with: { tag: 'clang-13' }, timeout-minutes: 5 }
+      - { uses: './.github/actions/compilers', name: 'clang 12', with: { tag: 'clang-12' }, timeout-minutes: 5 }
+      - { uses: './.github/actions/compilers', name: 'clang 11', with: { tag: 'clang-11' }, timeout-minutes: 5 }
+      - { uses: './.github/actions/compilers', name: 'clang 10', with: { tag: 'clang-10' }, timeout-minutes: 5 }
+        # llvm-objcopy<=9 doesn't have --wildcard. It compiles, but leaves Rust symbols in libyjit.o and fail `make test-leaked-globals`.
+      - { uses: './.github/actions/compilers', name: 'clang 9',  with: { tag: 'clang-9',   append_configure: '--disable-yjit --disable-zjit' }, timeout-minutes: 5 }
+      - { uses: './.github/actions/compilers', name: 'clang 8',  with: { tag: 'clang-8',   append_configure: '--disable-yjit --disable-zjit' }, timeout-minutes: 5 }
+      - { uses: './.github/actions/compilers', name: 'clang 7',  with: { tag: 'clang-7',   append_configure: '--disable-yjit --disable-zjit' }, timeout-minutes: 5 }
+      - { uses: './.github/actions/compilers', name: 'clang 6',  with: { tag: 'clang-6.0', append_configure: '--disable-yjit --disable-zjit' }, timeout-minutes: 5 }
 
-          - { key: cppflags, name: DEBUG_FIND_TIME_NUMGUESS,       value: '-DDEBUG_FIND_TIME_NUMGUESS' }
-          - { key: cppflags, name: DEBUG_INTEGER_PACK,             value: '-DDEBUG_INTEGER_PACK' }
-#         - { key: cppflags, name: ENABLE_PATH_CHECK,              value: '-DENABLE_PATH_CHECK' }
+  compile5:
+    name: 'omnibus compilations, #5'
+    runs-on: ubuntu-latest
+    needs: compile-if
+    if: ${{ needs.compile-if.result == 'success' }}
+    timeout-minutes: 60
+    services: { docuum: { image: 'stephanmisc/docuum', options: '--init', volumes: [ '/root', '/var/run/docker.sock:/var/run/docker.sock' ] } }
+    steps:
+      - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
+        with: { sparse-checkout-cone-mode: false, sparse-checkout: /.github }
+      - { uses: './.github/actions/setup/directories', with: { srcdir: 'src', builddir: 'build', makeup: true, fetch-depth: 10 } }
+      # -Wno-strict-prototypes is necessary with current clang-15 since
+      # older autoconf generate functions without prototype and -pedantic
+      # now implies strict-prototypes. Disabling the error but leaving the
+      # warning generates a lot of noise from use of ANYARGS in
+      # rb_define_method() and friends.
+      # See: https://github.com/llvm/llvm-project/commit/11da1b53d8cd3507959022cd790d5a7ad4573d94
+      - { uses: './.github/actions/compilers', name: 'C99',      with: { CFLAGS: '-std=c99 -Werror=pedantic -pedantic-errors -Wno-strict-prototypes' }, timeout-minutes: 5 }
+      - { uses: './.github/actions/compilers', name: 'C11',   with: { CFLAGS:   '-std=c11   -Werror=pedantic -pedantic-errors -Wno-strict-prototypes' }, timeout-minutes: 5 }
+      - { uses: './.github/actions/compilers', name: 'C17',   with: { CFLAGS:   '-std=c17   -Werror=pedantic -pedantic-errors -Wno-strict-prototypes' }, timeout-minutes: 5 }
+      - { uses: './.github/actions/compilers', name: 'C23',   with: { CFLAGS:   '-std=c2x   -Werror=pedantic -pedantic-errors -Wno-strict-prototypes' }, timeout-minutes: 5 }
+      - { uses: './.github/actions/compilers', name: 'C++98', with: { CXXFLAGS: '-std=c++98 -Werror=pedantic -pedantic-errors -Wno-c++11-long-long' }, timeout-minutes: 5 }
+      - { uses: './.github/actions/compilers', name: 'C++11', with: { CXXFLAGS: '-std=c++11 -Werror=pedantic -pedantic-errors -Wno-c++11-long-long' }, timeout-minutes: 5 }
+      - { uses: './.github/actions/compilers', name: 'C++14', with: { CXXFLAGS: '-std=c++14 -Werror=pedantic -pedantic-errors -Wno-c++11-long-long' }, timeout-minutes: 5 }
+      - { uses: './.github/actions/compilers', name: 'C++17', with: { CXXFLAGS: '-std=c++17 -Werror=pedantic -pedantic-errors -Wno-c++11-long-long' }, timeout-minutes: 5 }
 
-          - { key: cppflags, name: GC_DEBUG_STRESS_TO_CLASS,       value: '-DGC_DEBUG_STRESS_TO_CLASS' }
-#         - { key: cppflags, name: GC_ENABLE_LAZY_SWEEP=0,         value: '-DGC_ENABLE_LAZY_SWEEP=0' }
-#         - { key: cppflags, name: GC_PROFILE_DETAIL_MEMOTY,       value: '-DGC_PROFILE_DETAIL_MEMOTY' }
-#         - { key: cppflags, name: GC_PROFILE_MORE_DETAIL,         value: '-DGC_PROFILE_MORE_DETAIL' }
+  compile6:
+    name: 'omnibus compilations, #6'
+    runs-on: ubuntu-latest
+    needs: compile-if
+    if: ${{ needs.compile-if.result == 'success' }}
+    timeout-minutes: 60
+    services: { docuum: { image: 'stephanmisc/docuum', options: '--init', volumes: [ '/root', '/var/run/docker.sock:/var/run/docker.sock' ] } }
+    steps:
+      - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
+        with: { sparse-checkout-cone-mode: false, sparse-checkout: /.github }
+      - { uses: './.github/actions/setup/directories', with: { srcdir: 'src', builddir: 'build', makeup: true, fetch-depth: 10 } }
+      - { uses: './.github/actions/compilers', name: 'C++20', with: { CXXFLAGS: '-std=c++20 -Werror=pedantic -pedantic-errors -Wno-c++11-long-long' }, timeout-minutes: 5 }
+      - { uses: './.github/actions/compilers', name: 'C++23', with: { CXXFLAGS: '-std=c++23 -Werror=pedantic -pedantic-errors -Wno-c++11-long-long' }, timeout-minutes: 5 }
+      - { uses: './.github/actions/compilers', name: 'C++26', with: { CXXFLAGS: '-std=c++26 -Werror=pedantic -pedantic-errors -Wno-c++11-long-long' }, timeout-minutes: 5 }
+      - { uses: './.github/actions/compilers', name: 'gmp',                 with: { append_configure: '--with-gmp', test_all: 'ruby/test_bignum.rb', test_spec: "/github/workspace/src/spec/ruby/core/integer" }, timeout-minutes: 5 }
+      - { uses: './.github/actions/compilers', name: 'jemalloc',            with: { append_configure: '--with-jemalloc' }, timeout-minutes: 5 }
+      - { uses: './.github/actions/compilers', name: 'valgrind',            with: { append_configure: '--with-valgrind' }, timeout-minutes: 5 }
+      - { uses: './.github/actions/compilers', name: 'coroutine=ucontext',  with: { append_configure: '--with-coroutine=ucontext' }, timeout-minutes: 5 }
+      - { uses: './.github/actions/compilers', name: 'coroutine=pthread',   with: { append_configure: '--with-coroutine=pthread' }, timeout-minutes: 5 }
 
-#         - { key: cppflags, name: CALC_EXACT_MALLOC_SIZE,         value: '-DCALC_EXACT_MALLOC_SIZE' }
-#         - { key: cppflags, name: MALLOC_ALLOCATED_SIZE_CHECK,    value: '-DMALLOC_ALLOCATED_SIZE_CHECK' }
+  compile7:
+    name: 'omnibus compilations, #7'
+    runs-on: ubuntu-latest
+    needs: compile-if
+    if: ${{ needs.compile-if.result == 'success' }}
+    timeout-minutes: 60
+    services: { docuum: { image: 'stephanmisc/docuum', options: '--init', volumes: [ '/root', '/var/run/docker.sock:/var/run/docker.sock' ] } }
+    steps:
+      - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
+        with: { sparse-checkout-cone-mode: false, sparse-checkout: /.github }
+      - { uses: './.github/actions/setup/directories', with: { srcdir: 'src', builddir: 'build', makeup: true, fetch-depth: 10 } }
+      - { uses: './.github/actions/compilers', name: 'disable-jit',         with: { append_configure: '--disable-yjit --disable-zjit' }, timeout-minutes: 5 }
+      - { uses: './.github/actions/compilers', name: 'disable-yjit',        with: { append_configure: '--disable-yjit' }, timeout-minutes: 5 }
+      - { uses: './.github/actions/compilers', name: 'disable-zjit',        with: { append_configure: '--disable-zjit' }, timeout-minutes: 5 }
+      - { uses: './.github/actions/compilers', name: 'disable-dln',         with: { append_configure: '--disable-dln' }, timeout-minutes: 5 }
+      - { uses: './.github/actions/compilers', name: 'enable-mkmf-verbose', with: { append_configure: '--enable-mkmf-verbose' }, timeout-minutes: 5 }
+      - { uses: './.github/actions/compilers', name: 'disable-rubygems',    with: { append_configure: '--disable-rubygems' }, timeout-minutes: 5 }
+      - { uses: './.github/actions/compilers', name: 'RUBY_DEVEL',          with: { append_configure: '--enable-devel' }, timeout-minutes: 5 }
+      - { uses: './.github/actions/compilers', name: 'OPT_THREADED_CODE=0',            with: { cppflags: '-DOPT_THREADED_CODE=0' }, timeout-minutes: 5 }
+      - { uses: './.github/actions/compilers', name: 'OPT_THREADED_CODE=1',            with: { cppflags: '-DOPT_THREADED_CODE=1' }, timeout-minutes: 5 }
+      - { uses: './.github/actions/compilers', name: 'OPT_THREADED_CODE=2',            with: { cppflags: '-DOPT_THREADED_CODE=2' }, timeout-minutes: 5 }
 
-#         - { key: cppflags, name: IBF_ISEQ_ENABLE_LOCAL_BUFFER,   value: '-DIBF_ISEQ_ENABLE_LOCAL_BUFFER' }
+  compile8:
+    name: 'omnibus compilations, #8'
+    runs-on: ubuntu-latest
+    needs: compile-if
+    if: ${{ needs.compile-if.result == 'success' }}
+    timeout-minutes: 60
+    services: { docuum: { image: 'stephanmisc/docuum', options: '--init', volumes: [ '/root', '/var/run/docker.sock:/var/run/docker.sock' ] } }
+    steps:
+      - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
+        with: { sparse-checkout-cone-mode: false, sparse-checkout: /.github }
+      - { uses: './.github/actions/setup/directories', with: { srcdir: 'src', builddir: 'build', makeup: true, fetch-depth: 10 } }
+      - { uses: './.github/actions/compilers', name: 'NDEBUG',                         with: { cppflags: '-DNDEBUG' }, timeout-minutes: 5 }
+      - { uses: './.github/actions/compilers', name: 'RUBY_DEBUG',                     with: { cppflags: '-DRUBY_DEBUG' }, timeout-minutes: 5 }
+      - { uses: './.github/actions/compilers', name: 'ARRAY_DEBUG',                    with: { cppflags: '-DARRAY_DEBUG' }, timeout-minutes: 5 }
+      - { uses: './.github/actions/compilers', name: 'BIGNUM_DEBUG',                   with: { cppflags: '-DBIGNUM_DEBUG' }, timeout-minutes: 5 }
+      - { uses: './.github/actions/compilers', name: 'CCAN_LIST_DEBUG',                with: { cppflags: '-DCCAN_LIST_DEBUG' }, timeout-minutes: 5 }
+      - { uses: './.github/actions/compilers', name: 'CPDEBUG=-1',                     with: { cppflags: '-DCPDEBUG=-1' }, timeout-minutes: 5 }
+      - { uses: './.github/actions/compilers', name: 'ENC_DEBUG',                      with: { cppflags: '-DENC_DEBUG' }, timeout-minutes: 5 }
+      - { uses: './.github/actions/compilers', name: 'GC_DEBUG',                       with: { cppflags: '-DGC_DEBUG' }, timeout-minutes: 5 }
 
-#         - { key: cppflags, name: RGENGC_ESTIMATE_OLDMALLOC,      value: '-DRGENGC_ESTIMATE_OLDMALLOC' }
-#         - { key: cppflags, name: RGENGC_FORCE_MAJOR_GC,          value: '-DRGENGC_FORCE_MAJOR_GC' }
-#         - { key: cppflags, name: RGENGC_OBJ_INFO,                value: '-DRGENGC_OBJ_INFO' }
-#         - { key: cppflags, name: RGENGC_OLD_NEWOBJ_CHECK,        value: '-DRGENGC_OLD_NEWOBJ_CHECK' }
-#         - { key: cppflags, name: RGENGC_PROFILE,                 value: '-DRGENGC_PROFILE' }
+  compile9:
+    name: 'omnibus compilations, #9'
+    runs-on: ubuntu-latest
+    needs: compile-if
+    if: ${{ needs.compile-if.result == 'success' }}
+    timeout-minutes: 60
+    services: { docuum: { image: 'stephanmisc/docuum', options: '--init', volumes: [ '/root', '/var/run/docker.sock:/var/run/docker.sock' ] } }
+    steps:
+      - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
+        with: { sparse-checkout-cone-mode: false, sparse-checkout: /.github }
+      - { uses: './.github/actions/setup/directories', with: { srcdir: 'src', builddir: 'build', makeup: true, fetch-depth: 10 } }
+      - { uses: './.github/actions/compilers', name: 'HASH_DEBUG',                     with: { cppflags: '-DHASH_DEBUG' }, timeout-minutes: 5 }
+      - { uses: './.github/actions/compilers', name: 'ID_TABLE_DEBUG',                 with: { cppflags: '-DID_TABLE_DEBUG' }, timeout-minutes: 5 }
+      - { uses: './.github/actions/compilers', name: 'RGENGC_DEBUG=-1',                with: { cppflags: '-DRGENGC_DEBUG=-1' }, timeout-minutes: 5 }
+      - { uses: './.github/actions/compilers', name: 'SYMBOL_DEBUG',                   with: { cppflags: '-DSYMBOL_DEBUG' }, timeout-minutes: 5 }
+      - { uses: './.github/actions/compilers', name: 'RGENGC_CHECK_MODE',              with: { cppflags: '-DRGENGC_CHECK_MODE' }, timeout-minutes: 5 }
+      - { uses: './.github/actions/compilers', name: 'VM_CHECK_MODE',                  with: { cppflags: '-DVM_CHECK_MODE' }, timeout-minutes: 5 }
+      - { uses: './.github/actions/compilers', name: 'USE_EMBED_CI=0',                 with: { cppflags: '-DUSE_EMBED_CI=0' }, timeout-minutes: 5 }
+      - { uses: './.github/actions/compilers', name: 'USE_FLONUM=0',                   with: { cppflags: '-DUSE_FLONUM=0', append_configure: '--disable-yjit --disable-zjit' }, timeout-minutes: 5 }
 
-#         - { key: cppflags, name: VM_DEBUG_BP_CHECK,              value: '-DVM_DEBUG_BP_CHECK' }
-#         - { key: cppflags, name: VM_DEBUG_VERIFY_METHOD_CACHE,   value: '-DVM_DEBUG_VERIFY_METHOD_CACHE' }
+  compileX:
+    name: 'omnibus compilations, #10'
+    runs-on: ubuntu-latest
+    needs: compile-if
+    if: ${{ needs.compile-if.result == 'success' }}
+    timeout-minutes: 60
+    services: { docuum: { image: 'stephanmisc/docuum', options: '--init', volumes: [ '/root', '/var/run/docker.sock:/var/run/docker.sock' ] } }
+    steps:
+      - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
+        with: { sparse-checkout-cone-mode: false, sparse-checkout: /.github }
+      - { uses: './.github/actions/setup/directories', with: { srcdir: 'src', builddir: 'build', makeup: true, fetch-depth: 10 } }
+      - { uses: './.github/actions/compilers', name: 'USE_LAZY_LOAD',                  with: { cppflags: '-DUSE_LAZY_LOAD' }, timeout-minutes: 5 }
+      - { uses: './.github/actions/compilers', name: 'USE_SYMBOL_GC=0',                with: { cppflags: '-DUSE_SYMBOL_GC=0' }, timeout-minutes: 5 }
+      - { uses: './.github/actions/compilers', name: 'USE_THREAD_CACHE=0',             with: { cppflags: '-DUSE_THREAD_CACHE=0' }, timeout-minutes: 5 }
+      - { uses: './.github/actions/compilers', name: 'USE_RUBY_DEBUG_LOG=1',           with: { cppflags: '-DUSE_RUBY_DEBUG_LOG=1' }, timeout-minutes: 5 }
+      - { uses: './.github/actions/compilers', name: 'USE_DEBUG_COUNTER',              with: { cppflags: '-DUSE_DEBUG_COUNTER=1' }, timeout-minutes: 5 }
+      - { uses: './.github/actions/compilers', name: 'SHARABLE_MIDDLE_SUBSTRING',      with: { cppflags: '-DSHARABLE_MIDDLE_SUBSTRING=1' }, timeout-minutes: 5 }
+      - { uses: './.github/actions/compilers', name: 'DEBUG_FIND_TIME_NUMGUESS',       with: { cppflags: '-DDEBUG_FIND_TIME_NUMGUESS' }, timeout-minutes: 5 }
+      - { uses: './.github/actions/compilers', name: 'DEBUG_INTEGER_PACK',             with: { cppflags: '-DDEBUG_INTEGER_PACK' }, timeout-minutes: 5 }
 
-          - { key: cppflags, name: MJIT_FORCE_ENABLE,              value: '-DMJIT_FORCE_ENABLE' }
-          - { key: cppflags, name: YJIT_FORCE_ENABLE,              value: '-DYJIT_FORCE_ENABLE' }
+  compileB:
+    name: 'omnibus compilations, #11'
+    runs-on: ubuntu-latest
+    needs: compile-if
+    if: ${{ needs.compile-if.result == 'success' }}
+    timeout-minutes: 60
+    services: { docuum: { image: 'stephanmisc/docuum', options: '--init', volumes: [ '/root', '/var/run/docker.sock:/var/run/docker.sock' ] } }
+    steps:
+      - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
+        with: { sparse-checkout-cone-mode: false, sparse-checkout: /.github }
+      - { uses: './.github/actions/setup/directories', with: { srcdir: 'src', builddir: 'build', makeup: true, fetch-depth: 10 } }
+      - { uses: './.github/actions/compilers', name: 'GC_DEBUG_STRESS_TO_CLASS',       with: { cppflags: '-DGC_DEBUG_STRESS_TO_CLASS' }, timeout-minutes: 5 }
+      - { uses: './.github/actions/compilers', name: 'GC_ENABLE_LAZY_SWEEP=0',         with: { cppflags: '-DGC_ENABLE_LAZY_SWEEP=0' }, timeout-minutes: 5 }
+      - { uses: './.github/actions/compilers', name: 'GC_PROFILE_DETAIL_MEMORY',       with: { cppflags: '-DGC_PROFILE_DETAIL_MEMORY' }, timeout-minutes: 5 }
+      - { uses: './.github/actions/compilers', name: 'GC_PROFILE_MORE_DETAIL',         with: { cppflags: '-DGC_PROFILE_MORE_DETAIL' }, timeout-minutes: 5 }
+      - { uses: './.github/actions/compilers', name: 'MALLOC_ALLOCATED_SIZE_CHECK',    with: { cppflags: '-DMALLOC_ALLOCATED_SIZE_CHECK' }, timeout-minutes: 5 }
+      - { uses: './.github/actions/compilers', name: 'RGENGC_ESTIMATE_OLDMALLOC',      with: { cppflags: '-DRGENGC_ESTIMATE_OLDMALLOC' }, timeout-minutes: 5 }
+      - { uses: './.github/actions/compilers', name: 'RGENGC_PROFILE',                 with: { cppflags: '-DRGENGC_PROFILE' }, timeout-minutes: 5 }
 
-    name: ${{ matrix.entry.name }}
+  compileC:
+    name: 'omnibus compilations, #12'
     runs-on: ubuntu-latest
-    container:
-      image: ghcr.io/ruby/ruby-ci-image:${{ matrix.entry.container || 'clang-14' }}
-      options: --user root
-    if: ${{ !startsWith(github.event.head_commit.message, '[DOC]') && !contains(github.event.pull_request.labels.*.name, 'Documentation') }}
+    needs: compile-if
+    if: ${{ needs.compile-if.result == 'success' }}
+    timeout-minutes: 60
+    services: { docuum: { image: 'stephanmisc/docuum', options: '--init', volumes: [ '/root', '/var/run/docker.sock:/var/run/docker.sock' ] } }
     steps:
-      - run: id
-        working-directory:
-      - run: mkdir build
-        working-directory:
-      - name: setenv
-        run: |
-          echo "${{ matrix.entry.key }}=${{ matrix.entry.value }}" >> $GITHUB_ENV
-          echo "GNUMAKEFLAGS=-sj$((1 + $(nproc --all)))" >> $GITHUB_ENV
-      - uses: actions/checkout@v3
-        with:
-          path: src
-      - uses: actions/cache@v3
-        with:
-          path: src/.downloaded-cache
-          key: downloaded-cache
-      - run: ./autogen.sh
-        working-directory: src
-      - name: Run configure
-        run: >
-          ../src/configure -C ${default_configure} ${append_configure}
-          ${{ matrix.entry.key == 'crosshost' && '--host="${crosshost}"' || '--with-gcc="${default_cc} ${append_cc}"' }}
-          ${{ matrix.entry.configure_append || '--enable-shared' }}
-      - run: make extract-extlibs
-      - run: make incs
-      - run: make
-      - run: make leaked-globals
-      - run: make test
-      - run: make install
-        if: ${{ matrix.entry.check }}
-      - run: make prepare-gems
-        if: ${{ matrix.entry.check }}
-      - run: make test-tool
-        if: ${{ matrix.entry.check }}
-      - run: make test-all TESTS='-- ruby -ext-'
-        if: ${{ matrix.entry.check }}
-      - run: make test-spec
-        if: ${{ matrix.entry.check }}
+      - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
+        with: { sparse-checkout-cone-mode: false, sparse-checkout: /.github }
+      - { uses: './.github/actions/setup/directories', with: { srcdir: 'src', builddir: 'build', makeup: true, fetch-depth: 10 } }
+      - { uses: './.github/actions/compilers', name: 'VM_DEBUG_BP_CHECK',              with: { cppflags: '-DVM_DEBUG_BP_CHECK' }, timeout-minutes: 5 }
+      - { uses: './.github/actions/compilers', name: 'VM_DEBUG_VERIFY_METHOD_CACHE',   with: { cppflags: '-DVM_DEBUG_VERIFY_METHOD_CACHE' }, timeout-minutes: 5 }
+      - { uses: './.github/actions/compilers', name: 'YJIT_FORCE_ENABLE',              with: { cppflags: '-DYJIT_FORCE_ENABLE' }, timeout-minutes: 5 }
+      - { uses: './.github/actions/compilers', name: 'UNIVERSAL_PARSER',               with: { cppflags: '-DUNIVERSAL_PARSER' }, timeout-minutes: 5 }
 
-      - uses: k0kubun/action-slack@v2.0.0
+  compilemax:
+    name: 'omnibus compilations, result'
+    runs-on: ubuntu-latest
+    if: ${{ always() }}
+    needs:
+      - 'compile1'
+      - 'compile2'
+      - 'compile3'
+      - 'compile4'
+      - 'compile5'
+      - 'compile6'
+      - 'compile7'
+      - 'compile8'
+      - 'compile9'
+      - 'compileX'
+      - 'compileB'
+      - 'compileC'
+    steps:
+      - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
+        with: { sparse-checkout-cone-mode: false, sparse-checkout: /.github }
+      - uses: ./.github/actions/slack
         with:
-          payload: |
-            {
-              "ci": "GitHub Actions",
-              "env": "${{ github.workflow }} / ${{ matrix.entry.name }}",
-              "url": "https://github.com/${{ github.repository }}/actions/runs/${{ github.run_id }}",
-              "commit": "${{ github.sha }}",
-              "branch": "${{ github.ref }}".split('/').reverse()[0]
-            }
-        env:
+          label: 'omnibus'
           SLACK_WEBHOOK_URL: ${{ secrets.SIMPLER_ALERTS_URL }} # ruby-lang slack: ruby/simpler-alerts-bot
-        if: ${{ failure() && github.event_name == 'push' }}
+        if: ${{ contains(needs.*.result, 'failure') || contains(needs.*.result, 'cancelled') }}
+      - run: false
+        working-directory:
+        if: ${{ contains(needs.*.result, 'failure') || contains(needs.*.result, 'cancelled') }}
 
 defaults:
   run:
diff --git a/.github/workflows/cygwin.yml b/.github/workflows/cygwin.yml
new file mode 100644
index 0000000000..ac73991fe8
--- /dev/null
+++ b/.github/workflows/cygwin.yml
@@ -0,0 +1,71 @@
+name: Cygwin
+on:
+  push:
+    paths-ignore:
+      - 'doc/**'
+      - '**/man/*'
+      - '**.md'
+      - '**.rdoc'
+      - '**/.document'
+      - '.*.yml'
+  pull_request:
+    paths-ignore:
+      - 'doc/**'
+      - '**/man/*'
+      - '**.md'
+      - '**.rdoc'
+      - '**/.document'
+      - '.*.yml'
+  merge_group:
+
+concurrency:
+  group: ${{ github.workflow }} / ${{ startsWith(github.event_name, 'pull') && github.ref_name || github.sha }}
+  cancel-in-progress: ${{ startsWith(github.event_name, 'pull') }}
+
+permissions:
+  contents: read
+
+jobs:
+  make:
+    runs-on: windows-2022
+
+    if: >-
+      ${{!(false
+      || contains(github.event.head_commit.message, '[DOC]')
+      || contains(github.event.pull_request.title, '[DOC]')
+      || contains(github.event.pull_request.labels.*.name, 'Documentation')
+      || (github.event_name == 'push' && github.event.pull_request.user.login == 'dependabot[bot]')
+      )}}
+
+    steps:
+      - run: git config --global core.autocrlf input
+
+      - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
+
+      - name: Setup Cygwin
+        uses: cygwin/cygwin-install-action@master
+        with:
+          packages: ruby gcc-core make autoconf libtool libssl-devel libyaml-devel libffi-devel zlib-devel rubygems
+
+      - name: configure
+        run: |
+          ./autogen.sh
+          ./configure --disable-install-doc
+        shell: C:\cygwin\bin\bash.EXE --noprofile --norc -e -o igncr -o pipefail {0}
+
+      - name: Extract bundled gems
+        run: |
+          make ruby -j5
+          make extract-gems
+        shell: C:\cygwin\bin\bash.EXE --noprofile --norc -e -o igncr -o pipefail {0}
+
+      - name: make all
+        timeout-minutes: 30
+        run: make -j4 V=1
+        shell: C:\cygwin\bin\bash.EXE --noprofile --norc -e -o igncr -o pipefail {0}
+
+      - uses: ./.github/actions/slack
+        with:
+          label: Cygwin
+          SLACK_WEBHOOK_URL: ${{ secrets.SIMPLER_ALERTS_URL }} # ruby-lang slack: ruby/simpler-alerts-bot
+        if: ${{ failure() }}
diff --git a/.github/workflows/default_gems_list.yml b/.github/workflows/default_gems_list.yml
new file mode 100644
index 0000000000..1c7e2195c8
--- /dev/null
+++ b/.github/workflows/default_gems_list.yml
@@ -0,0 +1,99 @@
+name: Update default gems list
+on: [push, pull_request, merge_group]
+
+env:
+  UPDATE_NEWS_ENABLED: true
+
+concurrency:
+  group: ${{ github.workflow }} / ${{ startsWith(github.event_name, 'pull') && github.ref_name || github.sha }}
+  cancel-in-progress: ${{ startsWith(github.event_name, 'pull') }}
+
+permissions:
+  contents: read
+
+jobs:
+  update_default_gems_list:
+    name: Update default gems list
+
+    permissions:
+      contents: write # for Git to git push
+
+    runs-on: ubuntu-latest
+
+    if: ${{ github.repository == 'ruby/ruby' }}
+
+    steps:
+      - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
+        with:
+          token: ${{ (github.repository == 'ruby/ruby' && !startsWith(github.event_name, 'pull')) && secrets.MATZBOT_AUTO_UPDATE_TOKEN || secrets.GITHUB_TOKEN }}
+
+      - id: gems
+        run: true
+        if: ${{ github.ref == 'refs/heads/master' }}
+
+      - uses: ./.github/actions/setup/directories
+        with:
+          makeup: true
+          # Skip overwriting MATZBOT_AUTO_UPDATE_TOKEN
+          checkout: '' # false (ref: https://github.com/actions/runner/issues/2238)
+        if: ${{ steps.gems.outcome == 'success' }}
+
+      - name: Download previous gems list
+        run: |
+          data=default_gems.json
+          mkdir -p .downloaded-cache
+          ln -s .downloaded-cache/$data .
+          curl -O -R -z ./$data https://stdgems.org/$data
+        if: ${{ steps.gems.outcome == 'success' }}
+
+      - name: Make default gems list
+        run: |
+          #!ruby
+          require 'rubygems'
+          $:.unshift "lib"
+          rgver = File.foreach("lib/rubygems.rb") do |line|
+            break $1 if /^\s*VERSION\s*=\s*"([^"]+)"/ =~ line
+          end
+          gems = Dir.glob("{ext,lib}/**/*.gemspec").map do |f|
+            spec = Gem::Specification.load(f)
+            "#{spec.name} #{spec.version}"
+          end.sort
+          File.open("gems/default_gems", "w") do |f|
+            f.puts "RubyGems #{rgver}"
+            f.puts gems
+          end
+        shell: ruby --disable=gems {0}
+        if: ${{ steps.gems.outcome == 'success' }}
+
+      - name: Maintain updated gems list in NEWS
+        run: |
+          ruby tool/update-NEWS-gemlist.rb default
+        if: ${{ steps.gems.outcome == 'success' && env.UPDATE_NEWS_ENABLED == 'true' }}
+
+      - name: Check diffs
+        id: diff
+        run: |
+          git diff --color --no-ext-diff --ignore-submodules --exit-code NEWS.md ||
+          echo update=true >> $GITHUB_OUTPUT
+        if: ${{ steps.gems.outcome == 'success' }}
+
+      - name: Commit
+        run: |
+          git pull --ff-only origin ${GITHUB_REF#refs/heads/}
+          git commit --message="Update default gems list at ${GITHUB_SHA:0:30} [ci skip]" NEWS.md
+          git push origin ${GITHUB_REF#refs/heads/}
+        env:
+          EMAIL: svn-admin@ruby-lang.org
+          GIT_AUTHOR_NAME: git
+          GIT_COMMITTER_NAME: git
+        if: >-
+          ${{
+          github.repository == 'ruby/ruby' &&
+          !startsWith(github.event_name, 'pull') &&
+          steps.diff.outputs.update
+          }}
+
+      - uses: ./.github/actions/slack
+        with:
+          SLACK_WEBHOOK_URL: ${{ secrets.SIMPLER_ALERTS_URL }} # ruby-lang slack: ruby/simpler-alerts-bot
+        if: ${{ failure() }}
diff --git a/.github/workflows/dependabot_automerge.yml b/.github/workflows/dependabot_automerge.yml
new file mode 100644
index 0000000000..a95c7005c4
--- /dev/null
+++ b/.github/workflows/dependabot_automerge.yml
@@ -0,0 +1,32 @@
+# from https://github.com/gofiber/swagger/blob/main/.github/workflows/dependabot_automerge.yml
+name: Dependabot auto-merge
+on:
+  pull_request:
+
+permissions:
+  contents: write
+  pull-requests: write
+
+jobs:
+  automerge:
+    runs-on: ubuntu-latest
+    if: github.event.pull_request.user.login == 'dependabot[bot]' && github.repository == 'ruby/ruby'
+    steps:
+      - name: Dependabot metadata
+        uses: dependabot/fetch-metadata@21025c705c08248db411dc16f3619e6b5f9ea21a # v2.5.0
+        id: metadata
+
+      - name: Wait for status checks
+        uses: lewagon/wait-on-check-action@3603e826ee561ea102b58accb5ea55a1a7482343 # v1.4.1
+        with:
+          repo-token: ${{ secrets.GITHUB_TOKEN }}
+          ref: ${{ github.event.pull_request.head.sha || github.sha }}
+          check-regexp: 'make \(check, .*\)'
+          wait-interval: 30
+
+      - name: Auto-merge for Dependabot PRs
+        if: ${{ steps.metadata.outputs.update-type == 'version-update:semver-minor' || steps.metadata.outputs.update-type == 'version-update:semver-patch' }}
+        run: gh pr merge --auto --rebase "$PR_URL"
+        env:
+          PR_URL: ${{ github.event.pull_request.html_url }}
+          GITHUB_TOKEN: ${{ secrets.MATZBOT_DEPENDABOT_MERGE_TOKEN }}
diff --git a/.github/workflows/labeler.yml b/.github/workflows/labeler.yml
new file mode 100644
index 0000000000..16dbac1afa
--- /dev/null
+++ b/.github/workflows/labeler.yml
@@ -0,0 +1,12 @@
+name: "Pull Request Labeler"
+on:
+- pull_request_target
+
+jobs:
+  labeler:
+    permissions:
+      contents: read
+      pull-requests: write
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/labeler@v6
diff --git a/.github/workflows/macos.yml b/.github/workflows/macos.yml
new file mode 100644
index 0000000000..29adcab39a
--- /dev/null
+++ b/.github/workflows/macos.yml
@@ -0,0 +1,202 @@
+name: macOS
+on:
+  push:
+    paths-ignore:
+      - 'doc/**'
+      - '**/man/*'
+      - '**.md'
+      - '**.rdoc'
+      - '**/.document'
+      - '.*.yml'
+  pull_request:
+    # Do not use paths-ignore for required status checks
+    # https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/collaborating-on-repositories-with-code-quality-features/troubleshooting-required-status-checks#handling-skipped-but-required-checks
+  merge_group:
+
+concurrency:
+  group: ${{ github.workflow }} / ${{ startsWith(github.event_name, 'pull') && github.ref_name || github.sha }}
+  cancel-in-progress: ${{ startsWith(github.event_name, 'pull') }}
+
+permissions:
+  contents: read
+
+jobs:
+  make:
+    strategy:
+      matrix:
+        include:
+          - test_task: check
+            os: macos-14
+          - test_task: check
+            os: macos-14
+            configure_args: '--with-gcc=gcc-14'
+          - test_task: check
+            os: macos-14
+            configure_args: '--with-jemalloc --with-opt-dir=$(brew --prefix jemalloc)'
+          - test_task: check
+            os: macos-14
+            configure_args: '--with-gmp'
+          - test_task: test-all
+            test_opts: --repeat-count=2
+            os: macos-14
+          - test_task: test-bundler-parallel
+            os: macos-14
+          - test_task: test-bundled-gems
+            os: macos-14
+          - test_task: check
+            os: macos-15
+      fail-fast: false
+
+    env:
+      GITPULLOPTIONS: --no-tags origin ${{ github.ref }}
+
+    runs-on: ${{ matrix.os }}
+
+    if: >-
+      ${{!(false
+      || contains(github.event.head_commit.message, '[DOC]')
+      || contains(github.event.pull_request.title, '[DOC]')
+      || contains(github.event.pull_request.labels.*.name, 'Documentation')
+      || (github.event_name == 'push' && github.event.pull_request.user.login == 'dependabot[bot]')
+      )}}
+
+    steps:
+      - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
+        with:
+          sparse-checkout-cone-mode: false
+          sparse-checkout: /.github
+
+      - name: Install libraries
+        uses: ./.github/actions/setup/macos
+
+      - uses: ./.github/actions/setup/directories
+        with:
+          srcdir: src
+          builddir: build
+          makeup: true
+          clean: true
+          dummy-files: ${{ matrix.test_task == 'check' }}
+          # Set fetch-depth: 0 so that Launchable can receive commits information.
+          fetch-depth: 10
+
+      - name: make sure that kern.coredump=1
+        run: |
+          sysctl -n kern.coredump
+          sudo sysctl -w kern.coredump=1
+          sudo chmod -R +rwx /cores/
+
+      - name: Delete unused SDKs
+        # To free up disk space to not run out during the run
+        run: |
+          sudo rm -rf ~/.dotnet
+          sudo rm -rf /Library/Android
+          sudo rm -rf /Library/Developer/CoreSimulator
+        continue-on-error: true
+
+      - name: Run configure
+        run: ../src/configure -C --disable-install-doc ${ruby_configure_args} ${{ matrix.configure_args }}
+
+      - run: make prepare-gems
+        if: ${{ matrix.test_task == 'test-bundled-gems' }}
+
+      - run: make
+
+      - run: make hello
+
+      - name: runirb
+        run: |
+          echo IRB::VERSION | make runirb RUNOPT="-- -f"
+
+      - name: Set test options for skipped tests
+        run: |
+          set -x
+          TESTS="$(echo "${{ matrix.skipped_tests }}" | sed 's| |$$/ -n!/|g;s|^|-n!/|;s|$|$$/|')"
+          echo "TESTS=${TESTS}" >> $GITHUB_ENV
+        if: ${{ matrix.test_task == 'check' && matrix.skipped_tests }}
+
+      - name: Set up Launchable
+        id: launchable
+        uses: ./.github/actions/launchable/setup
+        with:
+          os: ${{ matrix.os }}
+          test-opts: ${{ matrix.test_opts }}
+          launchable-token: ${{ secrets.LAUNCHABLE_TOKEN }}
+          builddir: build
+          srcdir: src
+        continue-on-error: true
+        timeout-minutes: 3
+
+      - name: Set extra test options
+        run: |
+          echo "TESTS=$TESTS ${{ matrix.test_opts }}" >> $GITHUB_ENV
+          echo "RUBY_TEST_TIMEOUT_SCALE=10" >> $GITHUB_ENV # With --repeat-count=2, flaky test by timeout occurs frequently for some reason
+        if: matrix.test_opts
+
+      - name: make ${{ matrix.test_task }}
+        run: |
+          test -n "${LAUNCHABLE_STDOUT}" && exec 1> >(tee "${LAUNCHABLE_STDOUT}")
+          test -n "${LAUNCHABLE_STDERR}" && exec 2> >(tee "${LAUNCHABLE_STDERR}")
+
+          ulimit -c unlimited
+          make -s ${{ matrix.test_task }} ${TESTS:+TESTS="$TESTS"}
+        timeout-minutes: 90
+        env:
+          RUBY_TESTOPTS: '-q --tty=no'
+          TEST_BUNDLED_GEMS_ALLOW_FAILURES: ''
+          PRECHECK_BUNDLED_GEMS: 'no'
+          LAUNCHABLE_STDOUT: ${{ steps.launchable.outputs.stdout_report_path }}
+          LAUNCHABLE_STDERR: ${{ steps.launchable.outputs.stderr_report_path }}
+
+      - name: make skipped tests
+        run: |
+          make -s test-all TESTS="${TESTS//-n!\//-n/}"
+        env:
+          GNUMAKEFLAGS: ''
+          RUBY_TESTOPTS: '-v --tty=no'
+          PRECHECK_BUNDLED_GEMS: 'no'
+        if: ${{ matrix.test_task == 'check' && matrix.skipped_tests }}
+        continue-on-error: ${{ matrix.continue-on-skipped_tests || false }}
+
+      - name: CAPI extensions
+        uses: ./.github/actions/capiext
+        with:
+          builddir: build
+        env:
+          RUBY_TESTOPTS: '-v --tty=no'
+        if: ${{ contains(matrix.extra_checks, 'capi') }}
+
+      - uses: ./.github/actions/slack
+        with:
+          label: ${{ matrix.os }} / ${{ matrix.test_task }}
+          SLACK_WEBHOOK_URL: ${{ secrets.SIMPLER_ALERTS_URL }} # ruby-lang slack: ruby/simpler-alerts-bot
+        if: ${{ failure() }}
+
+      - name: Resolve job ID
+        id: job_id
+        uses: actions/github-script@main
+        env:
+          matrix: ${{ toJson(matrix) }}
+        with:
+          script: |
+            const { data: workflow_run } = await github.rest.actions.listJobsForWorkflowRun({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              run_id: context.runId
+            });
+            const matrix = JSON.parse(process.env.matrix);
+            const job_name = `${context.job}${matrix ? ` (${Object.values(matrix).join(", ")})` : ""}`;
+            return workflow_run.jobs.find((job) => job.name === job_name).id;
+
+  result:
+    if: ${{ always() }}
+    name: ${{ github.workflow }} result
+    runs-on: macos-latest
+    needs: [make]
+    steps:
+      - run: exit 1
+        working-directory:
+        if: ${{ contains(needs.*.result, 'failure') || contains(needs.*.result, 'cancelled') }}
+
+defaults:
+  run:
+    working-directory: build
diff --git a/.github/workflows/mingw.yml b/.github/workflows/mingw.yml
index 8e3aec6e6f..5c639ad48b 100644
--- a/.github/workflows/mingw.yml
+++ b/.github/workflows/mingw.yml
@@ -3,160 +3,241 @@ on:
   push:
     paths-ignore:
       - 'doc/**'
+      - '**/man/*'
       - '**.md'
       - '**.rdoc'
+      - '**/.document'
+      - '.*.yml'
   pull_request:
     paths-ignore:
       - 'doc/**'
+      - '**/man/*'
       - '**.md'
       - '**.rdoc'
+      - '**/.document'
+      - '.*.yml'
+  merge_group:
 
 concurrency:
   group: ${{ github.workflow }} / ${{ startsWith(github.event_name, 'pull') && github.ref_name || github.sha }}
   cancel-in-progress: ${{ startsWith(github.event_name, 'pull') }}
 
+permissions:
+  contents: read
+
 # Notes:
 # Actions console encoding causes issues, see test-all & test-spec steps
 #
 jobs:
   make:
-    runs-on: windows-2022
+    runs-on: windows-${{ matrix.os }}
+
     name: ${{ github.workflow }} (${{ matrix.msystem }})
+
     env:
       MSYSTEM: ${{ matrix.msystem }}
-      MSYS2_ARCH: x86_64
-      CHOST: "x86_64-w64-mingw32"
-      CFLAGS:   "-march=x86-64 -mtune=generic -O3 -pipe -fstack-protector-strong"
-      CXXFLAGS: "-march=x86-64 -mtune=generic -O3 -pipe"
-      CPPFLAGS: "-D_FORTIFY_SOURCE=2 -D__USE_MINGW_ANSI_STDIO=1 -DFD_SETSIZE=2048"
-      LDFLAGS:  "-pipe -fstack-protector-strong"
-      UPDATE_UNICODE: "UNICODE_FILES=. UNICODE_PROPERTY_FILES=. UNICODE_AUXILIARY_FILES=. UNICODE_EMOJI_FILES=."
-      GITPULLOPTIONS: --no-tags origin ${{github.ref}}
+      MSYS2_ARCH: >-
+        ${{
+        contains(matrix.msystem, 'arm64') && 'aarch64' ||
+        contains(matrix.msystem, '64') && 'x86_64' || 'i686'
+        }}
+      MINGW_PACKAGE_PREFIX: >-
+        mingw-w${{
+        endsWith(matrix.msystem, '64') && '64' || '32'
+        }}-${{
+        startsWith(matrix.msystem, 'clang') && 'clang' ||
+        startsWith(matrix.msystem, 'ucrt') && 'ucrt' ||
+        'mingw'
+        }}-${{
+        contains(matrix.msystem, 'arm64') && 'aarch64' ||
+        endsWith(matrix.msystem, '64') && 'x86_64' || 'i686'
+        }}
+      CFLAGS: '-mtune=generic -O3 -pipe'
+      CXXFLAGS: '-mtune=generic -O3 -pipe'
+      CPPFLAGS: '-D_FORTIFY_SOURCE=2 -D__USE_MINGW_ANSI_STDIO=1 -DFD_SETSIZE=2048'
+      LDFLAGS: '-pipe'
+      GITPULLOPTIONS: --no-tags origin ${{ github.ref }}
+
     strategy:
       matrix:
         include:
-          - msystem: "MINGW64"
-            base_ruby: 2.6
-            test_task: "check" # to make job names consistent
-          - msystem: "UCRT64"
-            base_ruby: head
-            test_task: "check" # to make job names consistent
+          # To mitigate flakiness of MinGW CI, we test only one runtime that newer MSYS2 uses.
+          # Ruby 3.2 is the first Windows Ruby to use OpenSSL 3.x
+          - msystem: 'UCRT64'
+            os: 2022
+            test_task: 'check'
+            test-all-opts: '--name=!/TestObjSpace#test_reachable_objects_during_iteration/'
+          - msystem: 'CLANGARM64'
+            os: 11-arm
+            test_task: 'check'
       fail-fast: false
-    if: ${{ !startsWith(github.event.head_commit.message, '[DOC]') && !contains(github.event.pull_request.labels.*.name, 'Documentation') }}
+
+    if: >-
+      ${{!(false
+      || contains(github.event.head_commit.message, '[DOC]')
+      || contains(github.event.pull_request.title, '[DOC]')
+      || contains(github.event.pull_request.labels.*.name, 'Documentation')
+      || (github.event_name == 'push' && github.event.pull_request.user.login == 'dependabot[bot]')
+      )}}
+
     steps:
-      - run: mkdir build
-        working-directory:
-      - name: git config
-        run: |
-          git config --global core.autocrlf false
-          git config --global core.eol lf
-          git config --global advice.detachedHead 0
-          git config --global init.defaultBranch garbage
-      - uses: actions/checkout@v3
+      - uses: msys2/setup-msys2@4f806de0a5a7294ffabaff804b38a9b435a73bda # v2.30.0
+        id: msys2
         with:
-          path: src
-      - uses: actions/cache@v3
-        with:
-          path: src/.downloaded-cache
-          key: downloaded-cache
-      - name: Set up Ruby & MSYS2
-        uses: ruby/setup-ruby@v1
-        with:
-          ruby-version: ${{ matrix.base_ruby }}
-      - name: set env
+          msystem: ${{ matrix.msystem }}
+          update: true
+          install: >-
+            git
+            make
+            ruby
+            autoconf
+            ${{ env.MINGW_PACKAGE_PREFIX }}-gcc
+            ${{ env.MINGW_PACKAGE_PREFIX }}-ragel
+            ${{ env.MINGW_PACKAGE_PREFIX }}-openssl
+            ${{ env.MINGW_PACKAGE_PREFIX }}-libyaml
+            ${{ env.MINGW_PACKAGE_PREFIX }}-libffi
+
+      - name: Set up env
+        id: setup-env
+        working-directory:
         run: |
-          echo "GNUMAKEFLAGS=-j$((2 * NUMBER_OF_PROCESSORS))" >> $GITHUB_ENV
-          echo "TEST_JOBS=$((15 * NUMBER_OF_PROCESSORS / 10))" >> $GITHUB_ENV
+          $msys2 = ${env:MSYS2_LOCATION}
+          $msystem = ${env:MSYSTEM}.ToLower()
+          echo $msys2\usr\bin $msys2\$msystem\bin |
+            Tee-Object ${env:GITHUB_PATH} -Append -Encoding utf-8
+
+          # Use the fast device for the temporary directory.
+          # %TEMP% is inconsistent with %TMP% and test-all expects they are consistent.
+          # https://github.com/actions/virtual-environments/issues/712#issuecomment-613004302
+          $tmp = ${env:RUNNER_TEMP}
+          echo HOME=$home TMP=$tmp TEMP=$tmp TMPDIR=$tmp |
+            Tee-Object ${env:GITHUB_ENV} -Append -Encoding utf-8
+        shell: pwsh             # cmd.exe does not strip spaces before `|`.
+        env:
+          MSYS2_LOCATION: ${{ steps.msys2.outputs.msys2-location }}
+          MSYSTEM: ${{ matrix.msystem }}
 
-      - name: where check
-        run: |
-          # show where
-          mv /c/Windows/System32/libcrypto-1_1-x64.dll /c/Windows/System32/libcrypto-1_1-x64.dll_
-          mv /c/Windows/System32/libssl-1_1-x64.dll    /c/Windows/System32/libssl-1_1-x64.dll_
-          result=true
-          for e in gcc.exe ragel.exe make.exe bison.exe libcrypto-1_1-x64.dll libssl-1_1-x64.dll; do
-            echo '##['group']'$'\033[93m'$e$'\033[m'
-            where $e || result=false
-            echo '##['endgroup']'
-          done
-          $result
-
-      - name: version check
+      - name: Remove Strawberry Perl pkg-config
+        working-directory:
+        # `pkg-config.bat` included in Strawberry Perl is written in
+        # Perl and doesn't work when another msys2 `perl` precede its
+        # own `perl`.
+        #
+        # ```
+        # Can't find C:\Strawberry\perl\bin\pkg-config.bat on PATH, '.' not in PATH.
+        # ```
         run: |
-          # show version
-          result=true
-          for e in gcc ragel make bison "openssl version"; do
-            case "$e" in *" "*) ;; *) e="$e --version";; esac
-            echo '##['group']'$'\033[93m'$e$'\033[m'
-            $e || result=false
-            echo '##['endgroup']'
-          done
-          $result
-
-      - name: autogen
+          Get-Command pkg-config.bat | % { ren $_.path ($_.path + "~") }
+        shell: pwsh
+
+      - name: Misc system & package info
+        working-directory:
         run: |
-          ./autogen.sh
-        working-directory: src
+          group() { echo ::group::$'\e[94;1m'"$*"$'\e[m'; }
+          endgroup() { echo ::endgroup::; }
+
+          group Path
+          cygpath -wa / . $(type -p cygpath bash sh)
+          endgroup
+
+          I() {
+              group $1
+              run Where type -pa $1 && { [ $# -eq 1 ] || run Version "$@"; } ||
+                  failed+=($1)
+              endgroup
+          }
+          run() { local w m=$1; shift; w="$("$@")" && show "$m" && indent "$w"; }
+          indent() { [ -z "$1" ] || echo "$1" | /bin/sed '/^$/!s/^/  /'; }
+          show() { echo $'\e[96m'"$*"$'\e[m'; }
+
+          failed=()
+
+          I gcc.exe --version
+          I ragel.exe --version
+          I make.exe --version
+          I openssl.exe version
+          I libcrypto-3-x64.dll
+          I libssl-3-x64.dll
+
+          group Packages
+          pacman -Qs $MINGW_PACKAGE_PREFIX-* | /bin/sed -n "s,local/$MINGW_PACKAGE_PREFIX-,,p"
+          endgroup
+
+          [ ${#failed[@]} -eq 0 ]
+        shell: sh
+
+      - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
+        with:
+          sparse-checkout-cone-mode: false
+          sparse-checkout: /.github
+
+      - uses: ./.github/actions/setup/directories
+        with:
+          srcdir: src
+          builddir: build
+          makeup: true
+          # Set fetch-depth: 10 so that Launchable can receive commits information.
+          fetch-depth: 10
 
       - name: configure
         run: >
           ../src/configure --disable-install-doc --prefix=/.
           --build=$CHOST --host=$CHOST --target=$CHOST
-
-      - name: update
-        run: |
-          make incs
-
-      - name: download gems
-        run: |
-          make update-gems
+        shell: sh
+        env:
+          CHOST: ${{ env.MSYS2_ARCH }}-w64-mingw32
 
       - name: make all
-        timeout-minutes: 20
-        run: |
-          make
-
-      - run: make leaked-globals
+        timeout-minutes: 30
+        run: make -j4
 
       - name: make install
-        run: |
-          make DESTDIR=../install install-nodoc
+        run: make DESTDIR=../install install-nodoc
+
+      - name: Set up Launchable
+        uses: ./.github/actions/launchable/setup
+        with:
+          os: windows-2022
+          launchable-token: ${{ secrets.LAUNCHABLE_TOKEN }}
+          builddir: build
+          srcdir: src
+          test-tasks: '["test", "test-all", "test-spec"]'
+        continue-on-error: true
+        timeout-minutes: 3
 
       - name: test
-        timeout-minutes: 5
-        run: |
-          make test
+        timeout-minutes: 30
+        run: make test test-tool
+        env:
+          GNUMAKEFLAGS: ''
+          RUBY_TESTOPTS: '-v --tty=no'
+        if: ${{ matrix.test_task == 'check' || matrix.test_task == 'test' }}
 
       - name: test-all
         timeout-minutes: 45
         run: |
-          # Actions uses UTF8, causes test failures, similar to normal OS setup
-          chcp.com 437
-          make test-all
+          make ${{ StartsWith(matrix.test_task, 'test/') && matrix.test_task || 'test-all' }}
         env:
-          RUBY_TESTOPTS: -j${{env.TEST_JOBS}} --retry --job-status=normal --show-skip --timeout-scale=1.5
+          RUBY_TESTOPTS: >-
+            --retry --job-status=normal --show-skip --timeout-scale=1.5 -j4
+            ${{ matrix.test-all-opts }}
+            ${{ env.TESTS }}
           BUNDLER_VERSION:
+        if: ${{ matrix.test_task == 'check' || matrix.test_task == 'test-all' || StartsWith(matrix.test_task, 'test/') }}
 
       - name: test-spec
         timeout-minutes: 10
         run: |
-          make test-spec
+          make ${{ StartsWith(matrix.test_task, 'spec/') && matrix.test_task || 'test-spec' }}
+        if: ${{ matrix.test_task == 'check' || matrix.test_task == 'test-spec' || StartsWith(matrix.test_task, 'spec/') }}
 
-      - uses: k0kubun/action-slack@v2.0.0
+      - uses: ./src/.github/actions/slack
         with:
-          payload: |
-            {
-              "ci": "GitHub Actions",
-              "env": "${{ github.workflow }} ${{ matrix.msystem }} / ${{ matrix.test_task }}",
-              "url": "https://github.com/${{ github.repository }}/actions/runs/${{ github.run_id }}",
-              "commit": "${{ github.sha }}",
-              "branch": "${{ github.ref }}".split('/').reverse()[0]
-            }
-        env:
+          label: ${{ matrix.msystem }} / ${{ matrix.test_task }}
           SLACK_WEBHOOK_URL: ${{ secrets.SIMPLER_ALERTS_URL }} # ruby-lang slack: ruby/simpler-alerts-bot
-        if: ${{ failure() && github.event_name == 'push' }}
+        if: ${{ failure() }}
 
 defaults:
   run:
     working-directory: build
-    shell: sh
+    shell: cmd
diff --git a/.github/workflows/mjit.yml b/.github/workflows/mjit.yml
deleted file mode 100644
index d5d9cecc56..0000000000
--- a/.github/workflows/mjit.yml
+++ /dev/null
@@ -1,97 +0,0 @@
-name: MJIT
-on:
-  push:
-    paths-ignore:
-      - 'doc/**'
-      - '**.md'
-      - '**.rdoc'
-  pull_request:
-    paths-ignore:
-      - 'doc/**'
-      - '**.md'
-      - '**.rdoc'
-
-concurrency:
-  group: ${{ github.workflow }} / ${{ startsWith(github.event_name, 'pull') && github.ref_name || github.sha }}
-  cancel-in-progress: ${{ startsWith(github.event_name, 'pull') }}
-
-jobs:
-  make:
-    strategy:
-      matrix:
-        test_task: [ "check" ] # to make job names consistent
-        jit_opts: [ "--mjit", "--mjit-wait" ]
-      fail-fast: false
-    runs-on: ubuntu-latest
-    if: ${{ !startsWith(github.event.head_commit.message, '[DOC]') && !contains(github.event.pull_request.labels.*.name, 'Documentation') }}
-    env:
-      TESTOPTS: '-q --tty=no'
-      RUN_OPTS: '--disable-gems ${{ matrix.jit_opts }} --mjit-debug=-ggdb3'
-      GITPULLOPTIONS: --no-tags origin ${{github.ref}}
-    steps:
-      - run: mkdir build
-        working-directory:
-      - name: Install libraries
-        run: |
-          set -x
-          sudo apt-get update -q || :
-          sudo apt-get install --no-install-recommends -q -y build-essential libssl-dev libyaml-dev libreadline6-dev zlib1g-dev libncurses5-dev libffi-dev bison autoconf ruby
-      - name: git config
-        run: |
-          git config --global advice.detachedHead 0
-          git config --global init.defaultBranch garbage
-      - uses: actions/checkout@v3
-        with:
-          path: src
-      - uses: actions/cache@v3
-        with:
-          path: src/.downloaded-cache
-          key: downloaded-cache
-      - name: Fixed world writable dirs
-        run: |
-          chmod -v go-w $HOME $HOME/.config
-          sudo chmod -R go-w /usr/share
-          sudo bash -c 'IFS=:; for d in '"$PATH"'; do chmod -v go-w $d; done' || :
-      - name: Set ENV
-        run: |
-          echo "GNUMAKEFLAGS=-j$((1 + $(nproc --all)))" >> $GITHUB_ENV
-      - run: ./autogen.sh
-        working-directory: src
-      - name: Run configure
-        run: ../src/configure -C --disable-install-doc cppflags=-DVM_CHECK_MODE
-      - run: make incs
-      - run: make
-      - run: sudo make -s install
-      - run: sudo apt-get install gdb # used by test / test-all failure
-      - name: Run test
-        run: |
-          ulimit -c unlimited
-          make -s test RUN_OPTS="$RUN_OPTS"
-        timeout-minutes: 60
-      - name: Run test-all
-        run: |
-          ulimit -c unlimited
-          make -s test-all RUN_OPTS="$RUN_OPTS"
-        timeout-minutes: 60
-      - name: Run test-spec
-        run: |
-          ulimit -c unlimited
-          make -s test-spec RUN_OPTS="$RUN_OPTS"
-        timeout-minutes: 60
-      - uses: k0kubun/action-slack@v2.0.0
-        with:
-          payload: |
-            {
-              "ci": "GitHub Actions",
-              "env": "${{ github.workflow }} / ${{ matrix.test_task }} ${{ matrix.jit_opts }}",
-              "url": "https://github.com/${{ github.repository }}/actions/runs/${{ github.run_id }}",
-              "commit": "${{ github.sha }}",
-              "branch": "${{ github.ref }}".split('/').reverse()[0]
-            }
-        env:
-          SLACK_WEBHOOK_URL: ${{ secrets.SIMPLER_ALERTS_URL }} # ruby-lang slack: ruby/simpler-alerts-bot
-        if: ${{ failure() && github.event_name == 'push' }}
-
-defaults:
-  run:
-    working-directory: build
diff --git a/.github/workflows/modgc.yml b/.github/workflows/modgc.yml
new file mode 100644
index 0000000000..1d14934df8
--- /dev/null
+++ b/.github/workflows/modgc.yml
@@ -0,0 +1,176 @@
+name: ModGC
+on:
+  push:
+    paths-ignore:
+      - 'doc/**'
+      - '**/man/*'
+      - '**.md'
+      - '**.rdoc'
+      - '**/.document'
+      - '.*.yml'
+  pull_request:
+    # Do not use paths-ignore for required status checks
+    # https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/collaborating-on-repositories-with-code-quality-features/troubleshooting-required-status-checks#handling-skipped-but-required-checks
+  merge_group:
+
+concurrency:
+  group: ${{ github.workflow }} / ${{ startsWith(github.event_name, 'pull') && github.ref_name || github.sha }}
+  cancel-in-progress: ${{ startsWith(github.event_name, 'pull') }}
+
+permissions:
+  contents: read
+
+jobs:
+  check:
+    strategy:
+      matrix:
+        gc:
+          - name: default
+          - name: mmtk
+            mmtk_build: release
+        os: [macos-latest, ubuntu-latest]
+        include:
+          - test_task: check
+      fail-fast: false
+
+    env:
+      GITPULLOPTIONS: --no-tags origin ${{ github.ref }}
+      RUBY_DEBUG: ci
+
+    runs-on: ${{ matrix.os }}
+
+    if: >-
+      ${{!(false
+      || contains(github.event.head_commit.message, '[DOC]')
+      || contains(github.event.pull_request.title, '[DOC]')
+      || contains(github.event.pull_request.labels.*.name, 'Documentation')
+      || (github.event_name == 'push' && github.event.pull_request.user.login == 'dependabot[bot]')
+      )}}
+
+    steps:
+      - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
+        with:
+          sparse-checkout-cone-mode: false
+          sparse-checkout: /.github
+
+      - name: Install libraries (macOS)
+        uses: ./.github/actions/setup/macos
+        if: ${{ contains(matrix.os, 'macos') }}
+
+      - name: Install libraries (Ubuntu)
+        uses: ./.github/actions/setup/ubuntu
+        if: ${{ contains(matrix.os, 'ubuntu') }}
+
+      - uses: ruby/setup-ruby@b90be12699fdfcbee4440c2bba85f6f460446bb0 # v1.279.0
+        with:
+          ruby-version: '3.1'
+          bundler: none
+        if: ${{ contains(matrix.os, 'ubuntu') }}
+
+      - uses: ./.github/actions/setup/directories
+        with:
+          srcdir: src
+          builddir: build
+          makeup: true
+          clean: true
+          dummy-files: false
+          # Set fetch-depth: 10 so that Launchable can receive commits information.
+          fetch-depth: 10
+
+      - name: make sure that kern.coredump=1
+        run: |
+          sysctl -n kern.coredump
+          sudo sysctl -w kern.coredump=1
+          sudo chmod -R +rwx /cores/
+        if: ${{ contains(matrix.os, 'macos') }}
+
+      - name: Delete unused SDKs
+        # To free up disk space to not run out during the run
+        run: |
+          sudo rm -rf ~/.dotnet
+          sudo rm -rf /Library/Android
+          sudo rm -rf /Library/Developer/CoreSimulator
+        continue-on-error: true
+        if: ${{ contains(matrix.os, 'macos') }}
+
+      - name: Setup Ruby GC Directory
+        run: |
+          echo "MODULAR_GC_DIR=$HOME/ruby_gc" >> $GITHUB_ENV
+
+      - name: Run configure
+        env:
+          arch: ${{ matrix.arch }}
+        run: >-
+          $SETARCH ../src/configure -C --disable-install-doc --with-modular-gc=${{ env.MODULAR_GC_DIR }}
+          ${arch:+--target=$arch-$OSTYPE --host=$arch-$OSTYPE}
+
+      - uses: actions-rust-lang/setup-rust-toolchain@v1
+      - name: Set MMTk environment variables
+        run: |
+          echo 'EXCLUDES=../src/test/.excludes-mmtk' >> $GITHUB_ENV
+          echo 'MSPECOPT=-B../src/spec/mmtk.mspec' >> $GITHUB_ENV
+        if: ${{ matrix.gc.name == 'mmtk' }}
+
+      - run: $SETARCH make
+
+      - name: Build Modular  GC
+        run: |
+          echo "RUBY_GC_LIBRARY=${{ matrix.gc.name }}" >> $GITHUB_ENV
+          make install-modular-gc MODULAR_GC=${{ matrix.gc.name }} MMTK_BUILD=${{ matrix.gc.mmtk_build }}
+          make distclean-modular-gc MODULAR_GC=${{ matrix.gc.name }}
+
+      - run: $SETARCH make hello
+
+      - name: Set test options for skipped tests
+        run: |
+          set -x
+          TESTS="$(echo "${{ matrix.skipped_tests }}" | sed 's| |$$/ -n!/|g;s|^|-n!/|;s|$|$$/|')"
+          echo "TESTS=${TESTS}" >> $GITHUB_ENV
+        if: ${{ matrix.test_task == 'check' && matrix.skipped_tests }}
+
+      - name: Set up Launchable
+        id: launchable
+        uses: ./.github/actions/launchable/setup
+        with:
+          os: ${{ matrix.os || 'ubuntu-22.04' }}
+          test-opts: ${{ matrix.configure }}
+          launchable-token: ${{ secrets.LAUNCHABLE_TOKEN }}
+          builddir: build
+          srcdir: src
+        continue-on-error: true
+        timeout-minutes: 3
+
+      - name: make ${{ matrix.test_task }}
+        run: |
+          test -n "${LAUNCHABLE_STDOUT}" && exec 1> >(tee "${LAUNCHABLE_STDOUT}")
+          test -n "${LAUNCHABLE_STDERR}" && exec 2> >(tee "${LAUNCHABLE_STDERR}")
+
+          $SETARCH make -s ${{ matrix.test_task }} \
+            ${TESTS:+TESTS="$TESTS"} \
+            ${{ !contains(matrix.test_task, 'bundle') && 'RUBYOPT=-w' || '' }}
+        timeout-minutes: ${{ matrix.gc.timeout || 40 }}
+        env:
+          RUBY_TESTOPTS: '-q --tty=no'
+          TEST_BUNDLED_GEMS_ALLOW_FAILURES: ''
+          PRECHECK_BUNDLED_GEMS: 'no'
+          LAUNCHABLE_STDOUT: ${{ steps.launchable.outputs.stdout_report_path }}
+          LAUNCHABLE_STDERR: ${{ steps.launchable.outputs.stderr_report_path }}
+
+      - name: make skipped tests
+        run: |
+          $SETARCH make -s test-all TESTS="${TESTS//-n!\//-n/}"
+        env:
+          GNUMAKEFLAGS: ''
+          RUBY_TESTOPTS: '-v --tty=no'
+        if: ${{ matrix.test_task == 'check' && matrix.skipped_tests }}
+        continue-on-error: ${{ matrix.continue-on-skipped_tests || false }}
+
+      - uses: ./.github/actions/slack
+        with:
+          label: ${{ matrix.test_task }} ${{ matrix.configure }}${{ matrix.arch }}
+          SLACK_WEBHOOK_URL: ${{ secrets.SIMPLER_ALERTS_URL }} # ruby-lang slack: ruby/simpler-alerts-bot
+        if: ${{ failure() }}
+
+defaults:
+  run:
+    working-directory: build
diff --git a/.github/workflows/parse_y.yml b/.github/workflows/parse_y.yml
new file mode 100644
index 0000000000..87facc8a55
--- /dev/null
+++ b/.github/workflows/parse_y.yml
@@ -0,0 +1,100 @@
+name: parse.y
+on:
+  push:
+    paths-ignore:
+      - 'doc/**'
+      - '**/man/*'
+      - '**.md'
+      - '**.rdoc'
+      - '**/.document'
+      - '.*.yml'
+  pull_request:
+    paths-ignore:
+      - 'doc/**'
+      - '**/man/*'
+      - '**.md'
+      - '**.rdoc'
+      - '**/.document'
+      - '.*.yml'
+  merge_group:
+
+concurrency:
+  group: ${{ github.workflow }} / ${{ startsWith(github.event_name, 'pull') && github.ref_name || github.sha }}
+  cancel-in-progress: ${{ startsWith(github.event_name, 'pull') }}
+
+permissions:
+  contents: read
+
+jobs:
+  make:
+    strategy:
+      matrix:
+        include:
+          - test_task: check
+          - test_task: test-bundler-parallel
+          - test_task: test-bundled-gems
+      fail-fast: false
+
+    env:
+      GITPULLOPTIONS: --no-tags origin ${{ github.ref }}
+      RUBY_DEBUG: ci
+      SETARCH: ${{ matrix.arch && format('setarch {0}', matrix.arch) }}
+
+    runs-on: ubuntu-22.04
+
+    if: >-
+      ${{!(false
+      || contains(github.event.head_commit.message, '[DOC]')
+      || contains(github.event.pull_request.title, '[DOC]')
+      || contains(github.event.pull_request.labels.*.name, 'Documentation')
+      || (github.event_name == 'push' && github.event.pull_request.user.login == 'dependabot[bot]')
+      )}}
+
+    steps:
+      - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
+        with:
+          sparse-checkout-cone-mode: false
+          sparse-checkout: /.github
+
+      - uses: ./.github/actions/setup/ubuntu
+
+      - uses: ruby/setup-ruby@b90be12699fdfcbee4440c2bba85f6f460446bb0 # v1.279.0
+        with:
+          ruby-version: '3.1'
+          bundler: none
+
+      - uses: ./.github/actions/setup/directories
+        with:
+          srcdir: src
+          builddir: build
+          makeup: true
+          clean: true
+          dummy-files: ${{ matrix.test_task == 'check' }}
+
+      - name: Run configure
+        run: ../src/configure -C --disable-install-doc cppflags=-DRUBY_DEBUG --with-parser=parse.y
+
+      - run: make
+
+      - run: make TESTRUN_SCRIPT='-renvutil -v -e "exit EnvUtil.current_parser == %[parse.y]"' run
+        env:
+          RUNOPT0: -I$(tooldir)/lib
+
+      - name: make ${{ matrix.test_task }}
+        run: make -s ${{ matrix.test_task }} RUN_OPTS="$RUN_OPTS" SPECOPTS="$SPECOPTS"
+        env:
+          RUBY_TESTOPTS: ${{ matrix.testopts }}
+          EXCLUDES: '../src/test/.excludes-parsey'
+          RUN_OPTS: ${{ matrix.run_opts || '--parser=parse.y' }}
+          SPECOPTS: ${{ matrix.specopts || '-T --parser=parse.y' }}
+          TEST_BUNDLED_GEMS_ALLOW_FAILURES: ''
+
+      - uses: ./.github/actions/slack
+        with:
+          label: ${{ matrix.run_opts }}
+          SLACK_WEBHOOK_URL: ${{ secrets.SIMPLER_ALERTS_URL }} # ruby-lang slack: ruby/simpler-alerts-bot
+        if: ${{ failure() }}
+
+defaults:
+  run:
+    working-directory: build
diff --git a/.github/workflows/post_push.yml b/.github/workflows/post_push.yml
new file mode 100644
index 0000000000..318444c0a2
--- /dev/null
+++ b/.github/workflows/post_push.yml
@@ -0,0 +1,85 @@
+name: Post-push
+on:
+  push:
+    branches:
+      - master
+      - 'ruby_*_*'
+jobs:
+  hooks:
+    name: Post-push hooks
+    runs-on: ubuntu-latest
+    if: ${{ github.repository == 'ruby/ruby' }}
+    steps:
+      - name: Sync git.ruby-lang.org
+        run: |
+          mkdir -p ~/.ssh
+          (umask 066; printenv RUBY_GIT_SYNC_PRIVATE_KEY > ~/.ssh/id_ed25519)
+          ssh-keyscan -t ed25519 git.ruby-lang.org >> ~/.ssh/known_hosts
+          ssh -i ~/.ssh/id_ed25519 git-sync@git.ruby-lang.org "sudo -u git /home/git/git.ruby-lang.org/bin/update-ruby.sh $GITHUB_REF"
+        env:
+          GITHUB_REF: ${{ github.ref }}
+          RUBY_GIT_SYNC_PRIVATE_KEY: ${{ secrets.RUBY_GIT_SYNC_PRIVATE_KEY }}
+        if: ${{ github.ref == 'refs/heads/master' || startsWith(github.ref, 'refs/heads/ruby_') }}
+
+      - name: Fetch changesets on bugs.ruby-lang.org
+        run: |
+          curl "https://bugs.ruby-lang.org/sys/fetch_changesets?key=${REDMINE_SYS_API_KEY}" -s --fail-with-body -w '* status: %{http_code}\n'
+        env:
+          REDMINE_SYS_API_KEY: ${{ secrets.REDMINE_SYS_API_KEY }}
+        if: ${{ github.ref == 'refs/heads/master' || startsWith(github.ref, 'refs/heads/ruby_') }}
+
+      - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
+        with:
+          fetch-depth: 500 # for notify-slack-commits
+          token: ${{ secrets.MATZBOT_AUTO_UPDATE_TOKEN }}
+
+      - name: Notify commit to Slack
+        run: ruby tool/notify-slack-commits.rb "$GITHUB_OLD_SHA" "$GITHUB_NEW_SHA" refs/heads/master
+        env:
+          GITHUB_OLD_SHA: ${{ github.event.before }}
+          GITHUB_NEW_SHA: ${{ github.event.after }}
+          SLACK_WEBHOOK_URL_ALERTS: ${{ secrets.SLACK_WEBHOOK_URL_ALERTS }}
+          SLACK_WEBHOOK_URL_COMMITS: ${{ secrets.SLACK_WEBHOOK_URL_COMMITS }}
+          SLACK_WEBHOOK_URL_RUBY_JP: ${{ secrets.SLACK_WEBHOOK_URL_RUBY_JP }}
+        if: ${{ github.ref == 'refs/heads/master' }}
+
+      - name: Notify commit to ruby-cvs
+        run: |
+          SENDMAIL="ssh -i ${HOME}/.ssh/id_ed25519 git-sync@git.ruby-lang.org /usr/sbin/sendmail" \
+            ruby tool/commit-email.rb . ruby-cvs@g.ruby-lang.org \
+            "$GITHUB_OLD_SHA" "$GITHUB_NEW_SHA" "$GITHUB_REF" \
+            --viewer-uri "https://github.com/ruby/ruby/commit/" \
+            --error-to cvs-admin@ruby-lang.org
+        env:
+          GITHUB_OLD_SHA: ${{ github.event.before }}
+          GITHUB_NEW_SHA: ${{ github.event.after }}
+          GITHUB_REF: ${{ github.ref }}
+        if: ${{ github.ref == 'refs/heads/master' || startsWith(github.ref, 'refs/heads/ruby_') }}
+
+      - name: Auto-correct code styles
+        run: |
+          set -x
+          ruby tool/auto-style.rb "$GITHUB_OLD_SHA" "$GITHUB_NEW_SHA" refs/heads/master
+        env:
+          GITHUB_OLD_SHA: ${{ github.event.before }}
+          GITHUB_NEW_SHA: ${{ github.event.after }}
+          GIT_AUTHOR_NAME: git
+          GIT_COMMITTER_NAME: git
+          EMAIL: svn-admin@ruby-lang.org
+        if: ${{ github.ref == 'refs/heads/master' }}
+
+      - name: Push PR notes to GitHub
+        run: ruby tool/notes-github-pr.rb "$(pwd)/.git" "$GITHUB_OLD_SHA" "$GITHUB_NEW_SHA" refs/heads/master
+        env:
+          GITHUB_OLD_SHA: ${{ github.event.before }}
+          GITHUB_NEW_SHA: ${{ github.event.after }}
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          GIT_AUTHOR_NAME: git
+          GIT_COMMITTER_NAME: git
+          EMAIL: svn-admin@ruby-lang.org
+        if: ${{ github.ref == 'refs/heads/master' }}
+
+      - uses: ./.github/actions/slack
+        with:
+          SLACK_WEBHOOK_URL: ${{ secrets.SIMPLER_ALERTS_URL }} # ruby-lang slack: ruby/simpler-alerts-bot
+        if: ${{ failure() }}
diff --git a/.github/workflows/pr-playground.yml b/.github/workflows/pr-playground.yml
new file mode 100644
index 0000000000..f3c0556429
--- /dev/null
+++ b/.github/workflows/pr-playground.yml
@@ -0,0 +1,127 @@
+name: Post Playground link to PR
+on:
+  pull_request_target:
+    types: [labeled]
+  workflow_run:
+    workflows: ["WebAssembly"]
+    types: [completed]
+
+jobs:
+  post-summary:
+    name: Post Playground link
+    runs-on: ubuntu-latest
+    permissions:
+      pull-requests: write
+    # Post a comment only if the PR status check is passed and the PR is labeled with `Playground`.
+    # Triggered twice: when the PR is labeled and when PR build is passed.
+    if: >-
+      ${{ false
+      || (true
+        && github.event_name == 'pull_request_target'
+        && contains(github.event.pull_request.labels.*.name, 'Playground'))
+      || (true
+        && github.event_name == 'workflow_run'
+        && github.event.workflow_run.conclusion == 'success'
+        && github.event.workflow_run.event == 'pull_request')
+      }}
+    steps:
+      - uses: actions/github-script@ed597411d8f924073f98dfc5c65a23a2325f34cd # v8.0.0
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          script: |
+            const fs = require('fs/promises');
+
+            const buildWorkflowPath = '.github/workflows/wasm.yml';
+            const findSuccessfuBuildRun = async (pr) => {
+              const opts = github.rest.actions.listWorkflowRunsForRepo.endpoint.merge({
+                owner: context.repo.owner,
+                repo: context.repo.repo,
+                status: 'success',
+                branch: pr.head.ref,
+              });
+              const runs = await github.paginate(opts);
+              const buildRun = runs.find(run => run.path == buildWorkflowPath);
+              return buildRun;
+            }
+
+            const postComment = async (body, pr) => {
+              const { data: comments } = await github.rest.issues.listComments({
+                owner: context.repo.owner,
+                repo: context.repo.repo,
+                issue_number: pr.number,
+              });
+
+              const commentOpts = { owner: context.repo.owner, repo: context.repo.repo, body: comment };
+
+              const existingComment = comments.find(comment => comment.body.startsWith(magicComment));
+              if (existingComment) {
+                core.info(`Updating existing comment: ${existingComment.html_url}`);
+                await github.rest.issues.updateComment({
+                  ...commentOpts, comment_id: existingComment.id
+                });
+              } else {
+                await github.rest.issues.createComment({
+                  ...commentOpts, issue_number: pr.number
+                });
+              }
+            }
+
+            const derivePRNumber = async () => {
+              if (context.payload.pull_request) {
+                return context.payload.pull_request.number;
+              }
+              // Workaround for https://github.com/orgs/community/discussions/25220
+
+              const { data: { artifacts } } = await github.rest.actions.listWorkflowRunArtifacts({
+                owner: context.repo.owner,
+                repo: context.repo.repo,
+                run_id: context.payload.workflow_run.id,
+              });
+              const artifact = artifacts.find(artifact => artifact.name == 'github-pr-info');
+              if (!artifact) {
+                throw new Error('Cannot find github-pr-info.txt artifact');
+              }
+
+              const { data } = await github.rest.actions.downloadArtifact({
+                owner: context.repo.owner,
+                repo: context.repo.repo,
+                artifact_id: artifact.id,
+                archive_format: 'zip',
+              });
+
+              await fs.writeFile('pr-info.zip', Buffer.from(data));
+              await exec.exec('unzip', ['pr-info.zip']);
+              return await fs.readFile('github-pr-info.txt', 'utf8');
+            }
+
+            const prNumber = await derivePRNumber();
+
+            const { data: pr } = await github.rest.pulls.get({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              pull_number: prNumber,
+            });
+
+            core.info(`Checking if the PR ${prNumber} is labeled with Playground...`);
+            if (!pr.labels.some(label => label.name == 'Playground')) {
+              core.info(`The PR is not labeled with Playground.`);
+              return;
+            }
+
+            core.info(`Checking if the build is successful for ${pr.head.ref} in ${pr.head.repo.owner.login}/${pr.head.repo.name}...`);
+            const buildRun = await findSuccessfuBuildRun(pr);
+            if (!buildRun) {
+              core.info(`No successful build run found for ${buildWorkflowPath} on ${pr.head.ref} yet.`);
+              return;
+            }
+            core.info(`Found a successful build run: ${buildRun.html_url}`);
+
+            const runLink = `${process.env.GITHUB_SERVER_URL}/${process.env.GITHUB_REPOSITORY}/actions/runs/${process.env.GITHUB_RUN_ID}`;
+            const magicComment = `<!-- AUTO-GENERATED-COMMENT-PR-PLAYGROUND -->`;
+            const comment = `${magicComment}
+            **Try on Playground**: https://ruby.github.io/play-ruby?run=${buildRun.id}
+            This is an automated comment by [\`pr-playground.yml\`](${runLink}) workflow.
+            `;
+            core.info(`Comment: ${comment}`);
+            await postComment(comment, pr);
+
diff --git a/.github/workflows/publish.yml b/.github/workflows/publish.yml
new file mode 100644
index 0000000000..3caeee9a3b
--- /dev/null
+++ b/.github/workflows/publish.yml
@@ -0,0 +1,107 @@
+name: Publish Ruby packages
+
+on:
+  repository_dispatch:
+    types:
+      - release
+  workflow_dispatch:
+    inputs:
+      version:
+        description: 'Version of the Ruby package to release'
+        required: true
+        default: '3.3.4'
+
+jobs:
+  release:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v6.0.1
+
+      - uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: 3.3.4
+
+      - name: Store Ruby version
+        run: |
+          echo "RUBY_VERSION=${{ github.event.client_payload.version || github.event.inputs.version }}" >> $GITHUB_ENV
+
+      - name: Store ABI version
+        run: echo "ABI_VERSION=$(echo ${{ env.RUBY_VERSION }} | cut -d '.' -f 1-2)" >> $GITHUB_ENV
+
+      - name: Copy draft package `/tmp` to `/pub` directory
+        run: tool/release.sh ${{ env.RUBY_VERSION }}
+        env:
+          AWS_ACCESS_KEY_ID: ${{ secrets.FTP_R_L_O_AWS_ACCESS_KEY_ID }}
+          AWS_SECRET_ACCESS_KEY: ${{ secrets.FTP_R_L_O_AWS_SECRET_ACCESS_KEY }}
+          AWS_DEFAULT_REGION: us-west-2
+
+      - name: Purge URLs of release package
+        run: |
+          curl -X POST \
+            -H "Fastly-Key: ${{ secrets.FASTLY_PURGE_TOKEN }}" \
+            https://api.fastly.com/purge/cache.ruby-lang.org/pub/ruby/${{ env.ABI_VERSION }}/ruby-${{ env.RUBY_VERSION }}.tar.gz
+          curl -X POST \
+            -H "Fastly-Key: ${{ secrets.FASTLY_PURGE_TOKEN }}" \
+            https://api.fastly.com/purge/cache.ruby-lang.org/pub/ruby/${{ env.ABI_VERSION }}/ruby-${{ env.RUBY_VERSION }}.tar.xz
+          curl -X POST \
+            -H "Fastly-Key: ${{ secrets.FASTLY_PURGE_TOKEN }}" \
+            https://api.fastly.com/purge/cache.ruby-lang.org/pub/ruby/${{ env.ABI_VERSION }}/ruby-${{ env.RUBY_VERSION }}.zip
+
+      - name: Create a release on GitHub
+        run: |
+          RELEASE_TAG=$(ruby tool/ruby-version.rb tag "${{ env.RUBY_VERSION }}")
+          echo $RELEASE_TAG
+          PREVIOUS_RELEASE_TAG=$(ruby tool/ruby-version.rb previous-tag "${{ env.RUBY_VERSION }}")
+          echo $PREVIOUS_RELEASE_TAG
+          tool/gen-github-release.rb $PREVIOUS_RELEASE_TAG $RELEASE_TAG --no-dry-run
+        env:
+          GITHUB_TOKEN: ${{ secrets.MATZBOT_AUTO_UPDATE_TOKEN }}
+
+      - name: Update versions index
+        run: |
+          curl -L -X POST \
+            -H "Authorization: Bearer ${{ secrets.MATZBOT_GITHUB_WORKFLOW_TOKEN }}" \
+            -H "Accept: application/vnd.github+json" \
+            -H "X-GitHub-Api-Version: 2022-11-28" \
+            https://api.github.com/repos/ruby/actions/dispatches \
+            -d '{"event_type": "update_index"}'
+
+      - name: Build and push Docker images
+        run: |
+          curl -L -X POST \
+            -H "Authorization: Bearer ${{ secrets.MATZBOT_GITHUB_WORKFLOW_TOKEN }}" \
+            -H "Accept: application/vnd.github+json" \
+            -H "X-GitHub-Api-Version: 2022-11-28" \
+            https://api.github.com/repos/ruby/docker-images/actions/workflows/build.yml/dispatches \
+            -d '{"ref": "master", "inputs": {"ruby_version": "${{ env.RUBY_VERSION }}"}}'
+
+      - name: Build snapcraft packages
+        run: |
+          curl -L -X POST \
+            -H "Authorization: Bearer ${{ secrets.MATZBOT_GITHUB_WORKFLOW_TOKEN }}" \
+            -H "Accept: application/vnd.github+json" \
+            -H "X-GitHub-Api-Version: 2022-11-28" \
+            https://api.github.com/repos/ruby/snap.ruby/dispatches \
+            -d '{"event_type": "build", "client_payload": {"ruby_version": "${{ env.RUBY_VERSION }}"}}'
+
+      - name: Store the latest LTS version of OpenSSL
+        run: |
+          echo "OPENSSL_VERSION=`curl -s https://api.github.com/repos/openssl/openssl/releases | jq -r '.[].tag_name | select(startswith("openssl-3.0"))' | sort -Vr | head -n1 | cut -d'-' -f2`" >> $GITHUB_ENV
+
+      - name: Update ruby-build definition
+        run: |
+          curl -L -X POST \
+            -H "Authorization: Bearer ${{ secrets.RUBY_BUILD_WORKFLOW_TOKEN }}" \
+            -H "Accept: application/vnd.github+json" \
+            -H "X-GitHub-Api-Version: 2022-11-28" \
+            https://api.github.com/repos/rbenv/ruby-build/dispatches \
+            -d '{"event_type": "update-ruby", "client_payload": {"ruby_version": "${{ env.RUBY_VERSION }}", "openssl_version": "${{ env.OPENSSL_VERSION }}"}}'
+
+      - name: Update all-ruby definition
+        run: |
+          curl -L -X POST \
+            -H "Authorization: Bearer ${{ secrets.MATZBOT_GITHUB_WORKFLOW_TOKEN }}" \
+            -H "Accept: application/vnd.github+json" \
+            -H "X-GitHub-Api-Version: 2022-11-28" \
+            https://api.github.com/repos/ruby/all-ruby/dispatches \
+            -d '{"event_type": "update"}'
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
new file mode 100644
index 0000000000..5d4474d978
--- /dev/null
+++ b/.github/workflows/release.yml
@@ -0,0 +1,18 @@
+name: Start release workflow
+on:
+  push:
+    tags:
+      - '*'
+
+jobs:
+  notify:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Build release package
+        run: |
+          curl -L -X POST \
+            -H "Authorization: Bearer ${{ secrets.MATZBOT_GITHUB_WORKFLOW_TOKEN }}" \
+            -H "Accept: application/vnd.github+json" \
+            -H "X-GitHub-Api-Version: 2022-11-28" \
+            https://api.github.com/repos/ruby/actions/dispatches \
+            -d '{"event_type": "${{ github.ref }}"}'
diff --git a/.github/workflows/rust-warnings.yml b/.github/workflows/rust-warnings.yml
new file mode 100644
index 0000000000..a2e3208e52
--- /dev/null
+++ b/.github/workflows/rust-warnings.yml
@@ -0,0 +1,60 @@
+# Surface Rust warnings on PRs that touch any Rust code.
+# Not a required check so we never block people over new warnings
+# that might come from a new Rust version being released.
+name: Rust warnings
+on:
+  pull_request:
+    types:
+      - opened
+      - synchronize
+      - reopened
+    paths:
+      - '**.rs'
+      - '!**.inc.rs'
+  merge_group:
+
+concurrency:
+  group: ${{ github.workflow }} / ${{ startsWith(github.event_name, 'pull') && github.ref_name || github.sha }}
+  cancel-in-progress: ${{ startsWith(github.event_name, 'pull') }}
+
+permissions:
+  contents: read
+
+jobs:
+  rust-warnings:
+    env:
+      GITPULLOPTIONS: --no-tags origin ${{ github.ref }}
+
+    runs-on: ubuntu-24.04
+
+    if: >-
+      ${{!(false
+      || contains(github.event.head_commit.message, '[DOC]')
+      || contains(github.event.pull_request.title, '[DOC]')
+      || contains(github.event.pull_request.labels.*.name, 'Documentation')
+      || (github.event_name == 'push' && github.event.pull_request.user.login == 'dependabot[bot]')
+      )}}
+
+    steps:
+      - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
+
+      - name: Install Rust
+        run: rustup default beta
+
+      - name: Rust warnings
+        shell: bash
+        run: |
+          set -eu
+          cargo check --quiet --all-features --message-format=json \
+            | jq -r 'select(.message.level | IN("warning", "error")) | .message.rendered' \
+            | tee messages.txt
+          (exit "${PIPESTATUS[0]}") && ! grep --quiet '[^[:space:]]' messages.txt
+
+      - name: "📜 `rustdoc` warnings"
+        shell: bash
+        run: |
+          set -eu
+          cargo doc --document-private-items --all --no-deps --message-format=json \
+            | jq -r 'select(.message.level | IN("warning", "error")) | .message.rendered' \
+            | tee messages.txt
+          (exit "${PIPESTATUS[0]}") && ! grep --quiet '[^[:space:]]' messages.txt
diff --git a/.github/workflows/scorecards.yml b/.github/workflows/scorecards.yml
new file mode 100644
index 0000000000..c607098997
--- /dev/null
+++ b/.github/workflows/scorecards.yml
@@ -0,0 +1,78 @@
+# This workflow uses actions that are not certified by GitHub. They are provided
+# by a third-party and are governed by separate terms of service, privacy
+# policy, and support documentation.
+
+name: Scorecard supply-chain security
+on:
+  # For Branch-Protection check. Only the default branch is supported. See
+  # https://github.com/ossf/scorecard/blob/main/docs/checks.md#branch-protection
+  branch_protection_rule:
+  # To guarantee Maintained check is occasionally updated. See
+  # https://github.com/ossf/scorecard/blob/main/docs/checks.md#maintained
+  schedule:
+    - cron: '39 3 * * 5'
+  # push:
+  #   branches: [ "master" ]
+
+# Declare default permissions as read only.
+permissions: read-all
+
+jobs:
+  analysis:
+    name: Scorecard analysis
+    runs-on: ubuntu-latest
+    # `publish_results: true` only works when run from the default branch. conditional can be removed if disabled.
+    if: github.event.repository.default_branch == github.ref_name || github.event_name == 'pull_request'
+    permissions:
+      # Needed to upload the results to code-scanning dashboard.
+      security-events: write
+      # Needed to publish results and get a badge (see publish_results below).
+      id-token: write
+      # Uncomment the permissions below if installing in a private repository.
+      # contents: read
+      # actions: read
+
+    steps:
+      - name: "Checkout code"
+        uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
+        with:
+          persist-credentials: false
+
+      - name: "Run analysis"
+        uses: ossf/scorecard-action@4eaacf0543bb3f2c246792bd56e8cdeffafb205a # v2.4.3
+        with:
+          results_file: results.sarif
+          results_format: sarif
+          # (Optional) "write" PAT token. Uncomment the `repo_token` line below if:
+          # - you want to enable the Branch-Protection check on a *public* repository, or
+          # - you are installing Scorecard on a *private* repository
+          # To create the PAT, follow the steps in https://github.com/ossf/scorecard-action?tab=readme-ov-file#authentication-with-fine-grained-pat-optional.
+          # repo_token: ${{ secrets.SCORECARD_TOKEN }}
+
+          # Public repositories:
+          #   - Publish results to OpenSSF REST API for easy access by consumers
+          #   - Allows the repository to include the Scorecard badge.
+          #   - See https://github.com/ossf/scorecard-action#publishing-results.
+          # For private repositories:
+          #   - `publish_results` will always be set to `false`, regardless
+          #     of the value entered here.
+          publish_results: true
+
+          # (Optional) Uncomment file_mode if you have a .gitattributes with files marked export-ignore
+          # file_mode: git
+
+      # Upload the results as artifacts (optional). Commenting out will disable uploads of run results in SARIF
+      # format to the repository Actions tab.
+      - name: "Upload artifact"
+        uses: actions/upload-artifact@b7c566a772e6b6bfb58ed0dc250532a479d7789f # v6.0.0
+        with:
+          name: SARIF file
+          path: results.sarif
+          retention-days: 5
+
+      # Upload the results to GitHub's code scanning dashboard (optional).
+      # Commenting out will disable upload of results to your repo's Code Scanning dashboard
+      - name: "Upload to code-scanning"
+        uses: github/codeql-action/upload-sarif@v4
+        with:
+          sarif_file: results.sarif
diff --git a/.github/workflows/spec_guards.yml b/.github/workflows/spec_guards.yml
index 18e2d3c1a8..cf4661555c 100644
--- a/.github/workflows/spec_guards.yml
+++ b/.github/workflows/spec_guards.yml
@@ -2,52 +2,66 @@ name: Rubyspec Version Guards Check
 
 on:
   push:
-    paths-ignore:
-      - 'doc/**'
-      - '**.md'
-      - '**.rdoc'
+    paths:
+      - '.github/workflows/spec_guards.yml'
+      - 'spec/**'
+      - '!spec/*.md'
   pull_request:
-    paths-ignore:
-      - 'doc/**'
-      - '**.md'
-      - '**.rdoc'
+    paths:
+      - '.github/workflows/spec_guards.yml'
+      - 'spec/**'
+      - '!spec/*.md'
+  merge_group:
 
 concurrency:
   group: ${{ github.workflow }} / ${{ startsWith(github.event_name, 'pull') && github.ref_name || github.sha }}
   cancel-in-progress: ${{ startsWith(github.event_name, 'pull') }}
 
+permissions:
+  contents: read
+
 jobs:
   rubyspec:
     name: Rubyspec
-    runs-on: ubuntu-20.04
-    if: ${{ !startsWith(github.event.head_commit.message, '[DOC]') && !contains(github.event.pull_request.labels.*.name, 'Documentation') }}
+
+    runs-on: ubuntu-22.04
+
+    if: >-
+      ${{!(false
+      || contains(github.event.head_commit.message, '[DOC]')
+      || contains(github.event.pull_request.title, '[DOC]')
+      || contains(github.event.pull_request.labels.*.name, 'Documentation')
+      || (github.event_name == 'push' && github.event.pull_request.user.login == 'dependabot[bot]')
+      )}}
+
     strategy:
       matrix:
         # Specs from ruby/spec should still run on all supported Ruby versions.
         # This also ensures the needed ruby_version_is guards are there, see spec/README.md.
         ruby:
-          - ruby-2.7
-          - ruby-3.1
+          - ruby-3.2
+          - ruby-3.3
+          - ruby-3.4
+          - ruby-4.0
+      fail-fast: false
 
     steps:
-      - uses: actions/checkout@v3
-      - uses: ruby/setup-ruby@v1
+      - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
+
+      - uses: ruby/setup-ruby@b90be12699fdfcbee4440c2bba85f6f460446bb0 # v1.279.0
         with:
           ruby-version: ${{ matrix.ruby }}
           bundler: none
+
       - run: gem install webrick
+
       - run: ruby ../mspec/bin/mspec
         working-directory: spec/ruby
-      - uses: k0kubun/action-slack@v2.0.0
-        with:
-          payload: |
-            {
-              "ci": "GitHub Actions",
-              "env": "${{ github.workflow }} / rubyspec @ ${{ matrix.ruby }}",
-              "url": "https://github.com/${{ github.repository }}/actions/runs/${{ github.run_id }}",
-              "commit": "${{ github.sha }}",
-              "branch": "${{ github.ref }}".split('/').reverse()[0]
-            }
         env:
+          CHECK_LEAKS: true
+
+      - uses: ./.github/actions/slack
+        with:
+          label: ${{ matrix.ruby }}
           SLACK_WEBHOOK_URL: ${{ secrets.SIMPLER_ALERTS_URL }} # ruby-lang slack: ruby/simpler-alerts-bot
-        if: ${{ failure() && github.event_name == 'push' }}
+        if: ${{ failure() }}
diff --git a/.github/workflows/sync_default_gems.yml b/.github/workflows/sync_default_gems.yml
new file mode 100644
index 0000000000..9ff97d5a4e
--- /dev/null
+++ b/.github/workflows/sync_default_gems.yml
@@ -0,0 +1,77 @@
+name: Sync default gems
+
+env:
+  DEFAULT_GEM_SYNC_ENABLED: true
+
+on:
+  workflow_dispatch:
+    inputs:
+      gem:
+        required: true
+        description: 'Name of the gem to be synchronized'
+        type: string
+      before:
+        required: true
+        description: 'Gem commit SHA before sync'
+        type: string
+      after:
+        required: true
+        description: 'Gem commit SHA after sync'
+        type: string
+
+jobs:
+  sync_default_gems:
+    name: Sync default gem ${{ github.event.inputs.gem }}
+
+    permissions:
+      contents: write # for Git to git push
+
+    runs-on: ubuntu-latest
+
+    if: ${{ github.repository == 'ruby/ruby' }}
+
+    steps:
+      - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
+        name: Check out ruby/ruby
+        with:
+          token: ${{ github.repository == 'ruby/ruby' && secrets.MATZBOT_AUTO_UPDATE_TOKEN || secrets.GITHUB_TOKEN }}
+
+      - uses: ruby/setup-ruby@b90be12699fdfcbee4440c2bba85f6f460446bb0 # v1.279.0
+        with:
+          ruby-version: '3.4'
+          bundler: none
+
+      - name: Run tool/sync_default_gems.rb
+        id: sync
+        run: |
+          ruby_before=$(git rev-parse HEAD)
+          set -x
+          ruby tool/sync_default_gems.rb "${gem_name}" "${gem_before}..${gem_after}"
+          if [[ "$(git rev-parse HEAD)" != "$ruby_before" ]]; then
+            echo update=true >> $GITHUB_OUTPUT
+          fi
+        env:
+          gem_name: ${{ github.event.inputs.gem }}
+          gem_before: ${{ github.event.inputs.before }}
+          gem_after: ${{ github.event.inputs.after }}
+          EMAIL: svn-admin@ruby-lang.org
+          GIT_AUTHOR_NAME: git
+          GIT_COMMITTER_NAME: git
+
+      - name: Push
+        run: |
+          git pull --rebase origin ${GITHUB_REF#refs/heads/}
+          git push origin ${GITHUB_REF#refs/heads/}
+        if: ${{ steps.sync.outputs.update && env.DEFAULT_GEM_SYNC_ENABLED == 'true' }}
+        env:
+          EMAIL: svn-admin@ruby-lang.org
+          GIT_AUTHOR_NAME: git
+          GIT_COMMITTER_NAME: git
+
+      - uses: ./.github/actions/slack
+        with:
+          SLACK_WEBHOOK_URL: ${{ secrets.SIMPLER_ALERTS_URL }} # ruby-lang slack: ruby/simpler-alerts-bot
+          label: "${{ github.event.inputs.gem }} (<https://github.com/${{ github.event.inputs.gem == 'rubygems' && 'rubygems' || 'ruby' }}/${{ github.event.inputs.gem }}/compare/${{ github.event.inputs.before }}...${{ github.event.inputs.after }}|diff>)"
+          event_name: workflow_dispatch
+          extra_channel_id: C05FPKAU743 # alerts-sync
+        if: ${{ failure() }}
diff --git a/.github/workflows/ubuntu.yml b/.github/workflows/ubuntu.yml
index b7097cca53..88c19b6fe6 100644
--- a/.github/workflows/ubuntu.yml
+++ b/.github/workflows/ubuntu.yml
@@ -3,129 +3,266 @@ on:
   push:
     paths-ignore:
       - 'doc/**'
+      - '**/man/*'
       - '**.md'
       - '**.rdoc'
+      - '**/.document'
+      - '.*.yml'
   pull_request:
-    paths-ignore:
-      - 'doc/**'
-      - '**.md'
-      - '**.rdoc'
+    # Do not use paths-ignore for required status checks
+    # https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/collaborating-on-repositories-with-code-quality-features/troubleshooting-required-status-checks#handling-skipped-but-required-checks
+  merge_group:
 
 concurrency:
   group: ${{ github.workflow }} / ${{ startsWith(github.event_name, 'pull') && github.ref_name || github.sha }}
   cancel-in-progress: ${{ startsWith(github.event_name, 'pull') }}
 
+permissions:
+  contents: read
+
 jobs:
   make:
     strategy:
       matrix:
-        test_task: ["check", "test-bundler-parallel", "test-bundled-gems"]
-        os:
-          - ubuntu-20.04
-#         - ubuntu-18.04
-        configure: ["", "cppflags=-DRUBY_DEBUG"]
+        # We enumerate every job in matrix.include to save build time
         include:
-          - test_task: "check"
-            configure: "--host=i686-$OSTYPE"
-          - test_task: "check"
-            configure: "--enable-shared --enable-load-relative"
-            skipped_tests: "TestGem#test_.*_from_binstubs.*"
-            continue-on-skipped_tests: true
-          - test_task: "test-all TESTS=--repeat-count=2"
+          - test_task: check
+            configure: 'cppflags=-DVM_CHECK_MODE'
+          - test_task: check
+            arch: i686
+          - test_task: check
+            configure: '--disable-yjit'
+          - test_task: check
+            configure: '--enable-shared --enable-load-relative'
+          - test_task: test-bundler-parallel
+            timeout: 50
+          - test_task: test-bundled-gems
+          - test_task: check
+            os: ubuntu-24.04
+            extra_checks: [capi]
+          # ubuntu-24.04-arm jobs don't start on ruby/ruby as of 2025-10-29
+          #- test_task: check
+          #  os: ubuntu-24.04-arm
       fail-fast: false
-    env:
-      GITPULLOPTIONS: --no-tags origin ${{github.ref}}
+
+    env: &make-env
+      GITPULLOPTIONS: --no-tags origin ${{ github.ref }}
       RUBY_DEBUG: ci
-    runs-on: ${{ matrix.os || 'ubuntu-20.04' }}
-    if: ${{ !startsWith(github.event.head_commit.message, '[DOC]') && !contains(github.event.pull_request.labels.*.name, 'Documentation') }}
-    steps:
-      - run: mkdir build
-        working-directory:
-      - name: Set ENV
-        env:
-          configure: ${{matrix.configure}}
-        run: |
-          echo "GNUMAKEFLAGS=-j$((1 + $(nproc --all)))" >> $GITHUB_ENV
-          arch=`echo " $configure" | sed '/.* --host=/!d;s///;s/[- ].*//'`
-          echo "SETARCH=${arch:+setarch $arch}" >> $GITHUB_ENV
-      - name: Install libraries
-        run: |
-          set -x
-          arch="${SETARCH##* }"
-          arch=${arch:+:${arch/i[3-6]86/i386}}
-          ${arch:+sudo dpkg --add-architecture ${arch#:}}
-          sudo apt-get update -q || :
-          sudo apt-get install --no-install-recommends -q -y \
-          ${arch:+cross}build-essential${arch/:/-} \
-          libssl-dev${arch} libyaml-dev${arch} libreadline6-dev${arch} \
-          zlib1g-dev${arch} libncurses5-dev${arch} libffi-dev${arch} \
-          bison autoconf ruby
-          sudo apt-get install -q -y pkg-config${arch} || :
-      - name: git config
-        run: |
-          git config --global advice.detachedHead 0
-          git config --global init.defaultBranch garbage
-      - uses: actions/checkout@v3
+
+    runs-on: ${{ matrix.os || 'ubuntu-22.04' }}
+
+    if: >-
+      ${{!(false
+      || contains(github.event.head_commit.message, '[DOC]')
+      || contains(github.event.pull_request.title, '[DOC]')
+      || contains(github.event.pull_request.labels.*.name, 'Documentation')
+      || (github.event_name == 'push' && github.event.pull_request.user.login == 'dependabot[bot]')
+      )}}
+
+    steps: &make-steps
+      - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
         with:
-          path: src
-      - uses: actions/cache@v3
+          sparse-checkout-cone-mode: false
+          sparse-checkout: /.github
+
+      - uses: ./.github/actions/setup/ubuntu
         with:
-          path: src/.downloaded-cache
-          key: downloaded-cache
-      - name: Fixed world writable dirs
-        run: |
-          chmod -v go-w $HOME $HOME/.config
-          sudo chmod -R go-w /usr/share
-          sudo bash -c 'IFS=:; for d in '"$PATH"'; do chmod -v go-w $d; done' || :
-      - run: ./autogen.sh
-        working-directory: src
+          arch: ${{ matrix.arch }}
+
+      - uses: ruby/setup-ruby@b90be12699fdfcbee4440c2bba85f6f460446bb0 # v1.279.0
+        with:
+          ruby-version: '3.1'
+          bundler: none
+        if: >-
+          ${{ !endsWith(matrix.os, 'arm')
+          && !endsWith(matrix.os, 'ppc64le') && !endsWith(matrix.os, 's390x') }}
+
+      - uses: ./.github/actions/setup/directories
+        with:
+          srcdir: src
+          builddir: build
+          makeup: true
+          clean: true
+          dummy-files: ${{ matrix.test_task == 'check' }}
+          # Set fetch-depth: 10 so that Launchable can receive commits information.
+          fetch-depth: 10
+
       - name: Run configure
         env:
-          arch: ${{matrix.arch}}
+          arch: ${{ matrix.arch }}
+          configure: ${{ matrix.configure }}
         run: >-
-          $SETARCH ../src/configure -C --disable-install-doc ${{ matrix.configure }}
-          ${arch:+--target=$arch-$OSTYPE}
-      - run: $SETARCH make incs
-      - run: $SETARCH make
-      - run: $SETARCH make leaked-globals
-        if: ${{ matrix.test_task == 'check' }}
+          $SETARCH ../src/configure -C --disable-install-doc ${configure:-cppflags=-DRUBY_DEBUG}
+          ${arch:+--target=$arch-$OSTYPE --host=$arch-$OSTYPE}
+
       - run: $SETARCH make prepare-gems
-        if: ${{ matrix.test_task == 'check' }}
-      - name: Create dummy files in build dir
+        if: ${{ matrix.test_task == 'test-bundled-gems' }}
+
+      - run: $SETARCH make
+
+      - run: $SETARCH make hello
+
+      - name: runirb
         run: |
-          $SETARCH ./miniruby -e '(("a".."z").to_a+("A".."Z").to_a+("0".."9").to_a+%w[foo bar test zzz]).each{|basename|File.write("#{basename}.rb", "raise %(do not load #{basename}.rb)")}'
-        if: ${{ matrix.test_task == 'check' }}
+          echo IRB::VERSION | $SETARCH make runirb RUNOPT="-- -f"
+
+      - name: Set test options for skipped tests
+        run: |
+          set -x
+          TESTS="$(echo "${{ matrix.skipped_tests }}" | sed 's| |$$/ -n!/|g;s|^|-n!/|;s|$|$$/|')"
+          echo "TESTS=${TESTS}" >> $GITHUB_ENV
+        if: ${{ matrix.test_task == 'check' && matrix.skipped_tests }}
+
+      - name: Set up Launchable
+        id: launchable
+        uses: ./.github/actions/launchable/setup
+        with:
+          os: ${{ matrix.os || 'ubuntu-22.04' }}
+          test-opts: ${{ matrix.configure }}
+          launchable-token: ${{ secrets.LAUNCHABLE_TOKEN }}
+          builddir: build
+          srcdir: src
+        continue-on-error: true
+        timeout-minutes: 3
+
+      # Avoid possible test failures with the zlib applying the following patch
+      # on s390x CPU architecture.
+      # https://github.com/madler/zlib/pull/410
+      - name: Disable DFLTCC
+        run: echo "DFLTCC=0" >> $GITHUB_ENV
+        if: ${{ endsWith(matrix.os, 's390x') }}
+
       - name: make ${{ matrix.test_task }}
         run: |
-          $SETARCH make -s ${{ matrix.test_task }} ${TESTS:+TESTS=`echo "$TESTS" | sed 's| |$$/ -n!/|g;s|^|-n!/|;s|$|$$/|'`}
-        timeout-minutes: 40
+          test -n "${LAUNCHABLE_STDOUT}" && exec 1> >(tee "${LAUNCHABLE_STDOUT}")
+          test -n "${LAUNCHABLE_STDERR}" && exec 2> >(tee "${LAUNCHABLE_STDERR}")
+
+          $SETARCH make -s ${{ matrix.test_task }} \
+          ${TESTS:+TESTS="$TESTS"} \
+          ${{ !contains(matrix.test_task, 'bundle') && 'RUBYOPT=-w' || '' }}
+        timeout-minutes: ${{ matrix.timeout || 40 }}
         env:
-          RUBY_TESTOPTS: "-q --tty=no"
-          TESTS: ${{ matrix.test_task == 'check' && matrix.skipped_tests || '' }}
-          TEST_BUNDLED_GEMS_ALLOW_FAILURES: ""
-          PRECHECK_BUNDLED_GEMS: "no"
+          RUBY_TESTOPTS: '-q --tty=no'
+          TEST_BUNDLED_GEMS_ALLOW_FAILURES: ''
+          PRECHECK_BUNDLED_GEMS: 'no'
+          LAUNCHABLE_STDOUT: ${{ steps.launchable.outputs.stdout_report_path }}
+          LAUNCHABLE_STDERR: ${{ steps.launchable.outputs.stderr_report_path }}
+
       - name: make skipped tests
         run: |
-          $SETARCH make -s test-all TESTS=`echo "$TESTS" | sed 's| |$$/ -n/|g;s|^|-n/|;s|$|$$/|'`
+          $SETARCH make -s test-all TESTS="${TESTS//-n!\//-n/}"
         env:
-          GNUMAKEFLAGS: ""
-          RUBY_TESTOPTS: "-v --tty=no"
-          TESTS: ${{ matrix.skipped_tests }}
-        if: ${{ matrix.test_task == 'check' && matrix.skipped_tests != '' }}
+          GNUMAKEFLAGS: ''
+          RUBY_TESTOPTS: '-v --tty=no'
+        if: ${{ matrix.test_task == 'check' && matrix.skipped_tests }}
         continue-on-error: ${{ matrix.continue-on-skipped_tests || false }}
-      - uses: k0kubun/action-slack@v2.0.0
+
+      - name: test-pc
+        run: |
+          DESTDIR=${RUNNER_TEMP-${TMPDIR-/tmp}}/installed
+          $SETARCH make test-pc "DESTDIR=$DESTDIR"
+
+      - name: CAPI extensions
+        uses: ./.github/actions/capiext
         with:
-          payload: |
-            {
-              "ci": "GitHub Actions",
-              "env": "${{ matrix.os }} / ${{ matrix.test_task }}${{ matrix.configure }}",
-              "url": "https://github.com/${{ github.repository }}/actions/runs/${{ github.run_id }}",
-              "commit": "${{ github.sha }}",
-              "branch": "${{ github.ref }}".split('/').reverse()[0]
-            }
+          builddir: build
+          make: '$SETARCH make'
         env:
+          RUBY_TESTOPTS: '-v --tty=no'
+        if: ${{ contains(matrix.extra_checks, 'capi') }}
+
+      - uses: ./.github/actions/slack
+        with:
+          label: ${{ matrix.test_task }} ${{ matrix.configure }}${{ matrix.arch }}${{ matrix.os }}
           SLACK_WEBHOOK_URL: ${{ secrets.SIMPLER_ALERTS_URL }} # ruby-lang slack: ruby/simpler-alerts-bot
-        if: ${{ failure() && github.event_name == 'push' }}
+        if: ${{ failure() }}
+
+  make-ibm:
+    strategy:
+      matrix:
+        include:
+          - test_task: check
+            os: ubuntu-24.04-ppc64le
+          - test_task: check
+            os: ubuntu-24.04-s390x
+      fail-fast: false
+
+    env: *make-env
+
+    runs-on: ${{ matrix.os }}
+
+    if: >-
+      ${{github.repository == 'ruby/ruby'
+      && !(false
+      || contains(github.event.head_commit.message, '[DOC]')
+      || contains(github.event.pull_request.title, '[DOC]')
+      || contains(github.event.pull_request.labels.*.name, 'Documentation')
+      || (github.event_name == 'push' && github.event.pull_request.user.login == 'dependabot[bot]')
+      )}}
+
+    steps: *make-steps
+
+  # Separated from `make` job to avoid making it a required status check
+  ruby-bench:
+    strategy:
+      matrix:
+        include:
+          # Using the same setup as ZJIT jobs
+          - bench_opts: '--warmup=1 --bench=1 --excludes=lobsters'
+
+    runs-on: ubuntu-24.04
+
+    if: >-
+      ${{!(false
+      || contains(github.event.head_commit.message, '[DOC]')
+      || contains(github.event.pull_request.title, '[DOC]')
+      || contains(github.event.pull_request.labels.*.name, 'Documentation')
+      || (github.event_name == 'push' && github.event.pull_request.user.login == 'dependabot[bot]')
+      )}}
+
+    steps:
+      - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
+
+      - uses: ./.github/actions/setup/ubuntu
+
+      - uses: ./.github/actions/setup/directories
+        with:
+          srcdir: src
+          builddir: build
+          makeup: true
+
+      - name: Run configure
+        run: ../src/configure -C --disable-install-doc --prefix="$(pwd)/install"
+
+      - run: make install
+
+      - name: Checkout ruby-bench
+        uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
+        with:
+          repository: ruby/ruby-bench
+          path: ruby-bench
+
+      # If you want to skip failing benchmark, consider using `--excludes`.
+      # e.g. `bench_opts: '--warmup=1 --bench=1 --excludes=railsbench,lobsters'`
+      - name: Run ruby-bench
+        run: ruby run_benchmarks.rb -e "ruby::../build/install/bin/ruby" ${{ matrix.bench_opts }}
+        working-directory: ruby-bench
+
+      - uses: ./.github/actions/slack
+        with:
+          label: ruby-bench ${{ matrix.bench_opts }} ${{ matrix.ruby_opts }}
+          SLACK_WEBHOOK_URL: ${{ secrets.SIMPLER_ALERTS_URL }} # ruby-lang slack: ruby/simpler-alerts-bot
+        if: ${{ failure() }}
+
+  result:
+    if: ${{ always() }}
+    name: ${{ github.workflow }} result
+    runs-on: ubuntu-latest
+    needs: [make]
+    steps:
+      - run: exit 1
+        working-directory:
+        if: ${{ contains(needs.*.result, 'failure') || contains(needs.*.result, 'cancelled') }}
 
 defaults:
   run:
diff --git a/.github/workflows/wasm.yml b/.github/workflows/wasm.yml
index db00db9009..0d2a6f0545 100644
--- a/.github/workflows/wasm.yml
+++ b/.github/workflows/wasm.yml
@@ -3,59 +3,80 @@ on:
   push:
     paths-ignore:
       - 'doc/**'
+      - '**/man/*'
       - '**.md'
       - '**.rdoc'
+      - '**/.document'
+      - '.*.yml'
   pull_request:
     paths-ignore:
       - 'doc/**'
+      - '**/man/*'
       - '**.md'
       - '**.rdoc'
+      - '**/.document'
+      - '.*.yml'
+  merge_group:
 
 concurrency:
   group: ${{ github.workflow }} / ${{ startsWith(github.event_name, 'pull') && github.ref_name || github.sha }}
   cancel-in-progress: ${{ startsWith(github.event_name, 'pull') }}
 
+permissions: # added using https://github.com/step-security/secure-workflows
+  contents: read
+
 jobs:
   make:
     strategy:
       matrix:
         entry:
 #         # wasmtime can't compile non-optimized Asyncified binary due to locals explosion
-#         - { name: O0-debuginfo, optflags: "-O0", debugflags: "-g", wasmoptflags: "-O1" }
-#         - { name: O1,           optflags: "-O1", debugflags: ""  , wasmoptflags: "-O1" }
-          - { name: O2,           optflags: "-O2", debugflags: ""  , wasmoptflags: "-O2" }
-#         - { name: O3,           optflags: "-O3", debugflags: ""  , wasmoptflags: "-O3" }
+#         - { name: O0-debuginfo, optflags: '-O0', debugflags: '-g', wasmoptflags: '-O1' }
+#         - { name: O1,           optflags: '-O1', debugflags: ''  , wasmoptflags: '-O1' }
+          - { name: O2, optflags: '-O2', debugflags: '', wasmoptflags: '-O2' }
+#         - { name: O3,           optflags: '-O3', debugflags: ''  , wasmoptflags: '-O3' }
 #         # -O4 is equivalent to -O3 in clang, but it's different in wasm-opt
-#         - { name: O4,           optflags: "-O3", debugflags: ""  , wasmoptflags: "-O4" }
-#         - { name: Oz,           optflags: "-Oz", debugflags: ""  , wasmoptflags: "-Oz" }
+#         - { name: O4,           optflags: '-O3', debugflags: ''  , wasmoptflags: '-O4' }
+#         - { name: Oz,           optflags: '-Oz', debugflags: ''  , wasmoptflags: '-Oz' }
       fail-fast: false
+
     env:
       RUBY_TESTOPTS: '-q --tty=no'
-      GITPULLOPTIONS: --no-tags origin ${{github.ref}}
-      WASI_SDK_VERSION_MAJOR: 14
+      GITPULLOPTIONS: --no-tags origin ${{ github.ref }}
+      WASI_SDK_VERSION_MAJOR: 25
       WASI_SDK_VERSION_MINOR: 0
-      # Use older version, which uses glibc instead of musl, to avoid https://github.com/WebAssembly/binaryen/issues/4401
-      BINARYEN_VERSION: 91
-      WASMTIME_VERSION: v0.33.0
-    runs-on: ubuntu-20.04
-    if: ${{ !startsWith(github.event.head_commit.message, '[DOC]') && !contains(github.event.pull_request.labels.*.name, 'Documentation') }}
+      BINARYEN_VERSION: 113
+      WASMTIME_VERSION: v15.0.0
+
+    runs-on: ubuntu-22.04
+
+    if: >-
+      ${{!(false
+      || contains(github.event.head_commit.message, '[DOC]')
+      || contains(github.event.pull_request.title, '[DOC]')
+      || contains(github.event.pull_request.labels.*.name, 'Documentation')
+      || (github.event_name == 'push' && github.event.pull_request.user.login == 'dependabot[bot]')
+      )}}
+
     steps:
-      - run: mkdir build
-        working-directory:
-      - name: git config
-        run: |
-          git config --global advice.detachedHead 0
-          git config --global init.defaultBranch garbage
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
+        with:
+          sparse-checkout-cone-mode: false
+          sparse-checkout: /.github
+
+      - uses: ./.github/actions/setup/directories
         with:
-          path: src
+          srcdir: src
+          builddir: build
+          makeup: true
+
       - name: Install libraries
         run: |
           set -ex
           sudo apt-get update -q || :
-          sudo apt-get install --no-install-recommends -q -y ruby bison make autoconf git wget
+          sudo apt-get install --no-install-recommends -q -y ruby make autoconf git wget
 
-          wasi_sdk_deb="wasi-sdk_${WASI_SDK_VERSION_MAJOR}.${WASI_SDK_VERSION_MINOR}_amd64.deb"
+          wasi_sdk_deb="wasi-sdk-${WASI_SDK_VERSION_MAJOR}.${WASI_SDK_VERSION_MINOR}-x86_64-linux.deb"
           wget "https://github.com/WebAssembly/wasi-sdk/releases/download/wasi-sdk-${WASI_SDK_VERSION_MAJOR}/${wasi_sdk_deb}"
           sudo dpkg -i "$wasi_sdk_deb"
           rm -f "$wasi_sdk_deb"
@@ -67,22 +88,43 @@ jobs:
           wget -O - "$wasmtime_url" | tar xJf -
           sudo ln -fs "$PWD/wasmtime-${WASMTIME_VERSION}-x86_64-linux/wasmtime" /usr/local/bin/wasmtime
 
-          binaryen_tarball="binaryen-version_${BINARYEN_VERSION}-x86-linux.tar.gz"
+          binaryen_tarball="binaryen-version_${BINARYEN_VERSION}-x86_64-linux.tar.gz"
           binaryen_url="https://github.com/WebAssembly/binaryen/releases/download/version_${BINARYEN_VERSION}/${binaryen_tarball}"
           wget -O - "$binaryen_url" | tar xfz -
-          sudo ln -fs "$PWD/binaryen-version_${BINARYEN_VERSION}/wasm-opt" /usr/local/bin/wasm-opt
+          sudo ln -fs "$PWD/binaryen-version_${BINARYEN_VERSION}/bin/wasm-opt" /usr/local/bin/wasm-opt
         working-directory: src
+
       - name: Set ENV
         run: |
-          echo "MAKEFLAGS=-j$((1 + $(sysctl -n hw.activecpu)))" >> $GITHUB_ENV
           echo "WASI_SDK_PATH=/opt/wasi-sdk" >> $GITHUB_ENV
-      - run: ./autogen.sh
+
+      - uses: ruby/setup-ruby@b90be12699fdfcbee4440c2bba85f6f460446bb0 # v1.279.0
+        with:
+          ruby-version: '3.1'
+          bundler: none
+
+      - name: Build baseruby
+        run: |
+          set -ex
+          mkdir ../baseruby
+          pushd ../baseruby
+          ../src/configure --prefix=$PWD/install
+          make
+          make install
+
+      - name: Download config.guess with wasi version
+        run: |
+          rm tool/config.guess tool/config.sub
+          ruby tool/downloader.rb -d tool -e gnu config.guess config.sub
         working-directory: src
+
       - name: Run configure
         run: |
           ../src/configure \
             --host wasm32-unknown-wasi \
+            --with-baseruby=$PWD/../baseruby/install/bin/ruby \
             --with-static-linked-ext \
+            --with-ext=cgi/escape,continuation,coverage,date,digest/bubblebabble,digest,digest/md5,digest/rmd160,digest/sha1,digest/sha2,etc,fcntl,json,json/generator,json/parser,objspace,pathname,rbconfig/sizeof,ripper,stringio,strscan,monitor \
             LDFLAGS=" \
               -Xlinker --stack-first \
               -Xlinker -z -Xlinker stack-size=16777216 \
@@ -91,16 +133,47 @@ jobs:
             debugflags="${{ matrix.entry.debugflags }}" \
             wasmoptflags="${{ matrix.entry.wasmoptflags }} ${{ matrix.entry.debugflags }}"
 
-      - run: make ruby
+      # miniruby may not be built when cross-compling
+      - run: make mini ruby
+
+      - run: make install DESTDIR=$PWD/../install
+      - run: tar cfz ../install.tar.gz -C ../install .
+
+      - name: Upload artifacts
+        uses: actions/upload-artifact@b7c566a772e6b6bfb58ed0dc250532a479d7789f # v6.0.0
+        with:
+          name: ruby-wasm-install
+          path: ${{ github.workspace }}/install.tar.gz
+      - name: Show Playground URL to try the build
+        run: |
+          echo "Try on Playground: https://ruby.github.io/play-ruby?run=$GITHUB_RUN_ID" >> $GITHUB_STEP_SUMMARY
+
       - name: Run basictest
         run: wasmtime run ./../build/miniruby --mapdir /::./ -- basictest/test.rb
         working-directory: src
+
       - name: Run bootstraptest (no thread)
         run: |
           NO_THREAD_TESTS="$(grep -L Thread -R ./bootstraptest | awk -F/ '{ print $NF }' | uniq | sed -n 's/test_\(.*\).rb/\1/p' | paste -s -d, -)"
           ruby ./bootstraptest/runner.rb --ruby="$(which wasmtime) run $PWD/../build/ruby --mapdir /::./ -- " --verbose "--sets=$NO_THREAD_TESTS"
         working-directory: src
 
+      - uses: ./.github/actions/slack
+        with:
+          label: ${{ matrix.entry.name }}
+          SLACK_WEBHOOK_URL: ${{ secrets.SIMPLER_ALERTS_URL }} # ruby-lang slack: ruby/simpler-alerts-bot
+        if: ${{ failure() }}
+
+      # Workaround for https://github.com/orgs/community/discussions/25220
+      - name: Save Pull Request number
+        if: ${{ github.event_name == 'pull_request' }}
+        run: echo "${{ github.event.pull_request.number }}" >> ${{ github.workspace }}/github-pr-info.txt
+      - uses: actions/upload-artifact@b7c566a772e6b6bfb58ed0dc250532a479d7789f # v6.0.0
+        if: ${{ github.event_name == 'pull_request' }}
+        with:
+          name: github-pr-info
+          path: ${{ github.workspace }}/github-pr-info.txt
+
 defaults:
   run:
     working-directory: build
diff --git a/.github/workflows/windows.yml b/.github/workflows/windows.yml
index 9c9d7b9da0..1d44a5482c 100644
--- a/.github/workflows/windows.yml
+++ b/.github/workflows/windows.yml
@@ -3,148 +3,197 @@ on:
   push:
     paths-ignore:
       - 'doc/**'
+      - '**/man/*'
       - '**.md'
       - '**.rdoc'
+      - '**/.document'
+      - '.*.yml'
   pull_request:
-    paths-ignore:
-      - 'doc/**'
-      - '**.md'
-      - '**.rdoc'
+    # Do not use paths-ignore for required status checks
+    # https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/collaborating-on-repositories-with-code-quality-features/troubleshooting-required-status-checks#handling-skipped-but-required-checks
+  merge_group:
 
 concurrency:
   group: ${{ github.workflow }} / ${{ startsWith(github.event_name, 'pull') && github.ref_name || github.sha }}
   cancel-in-progress: ${{ startsWith(github.event_name, 'pull') }}
 
+permissions:
+  contents: read
+
 jobs:
   make:
     strategy:
       matrix:
         include:
-          - vs: 2019
-          - vs: 2022
+          - os: 2022
+            vc: 2022
+            test_task: check
+          - os: 2025
+            vc: 2022
+            test_task: check
+          - os: 11-arm
+            test_task: 'btest test-basic test-tool' # check and test-spec are broken yet.
+            target: arm64
+          - os: 2025
+            vc: 2022
+            test_task: test-bundled-gems
       fail-fast: false
-    runs-on: windows-${{ matrix.vs < 2022 && '2019' || matrix.vs }}
-    if: ${{ !startsWith(github.event.head_commit.message, '[DOC]') && !contains(github.event.pull_request.labels.*.name, 'Documentation') }}
-    name: VisualStudio ${{ matrix.vs }}
+
+    runs-on: windows-${{ matrix.os }}
+
+    if: >-
+      ${{!(false
+      || contains(github.event.head_commit.message, '[DOC]')
+      || contains(github.event.pull_request.title, '[DOC]')
+      || contains(github.event.pull_request.labels.*.name, 'Documentation')
+      || (github.event_name == 'push' && github.event.pull_request.user.login == 'dependabot[bot]')
+      )}}
+
+    name: Windows ${{ matrix.os }}/Visual C++ ${{ matrix.vc }} (${{ matrix.test_task }})
+
     env:
-      GITPULLOPTIONS: --no-tags origin ${{github.ref}}
-      PATCH: C:\msys64\usr\bin\patch.exe
-      OS_VER: windows-${{ matrix.vs < 2022 && '2019' || matrix.vs }}
+      GITPULLOPTIONS: --no-tags origin ${{ github.ref }}
+      VCPKG_DEFAULT_TRIPLET: ${{ matrix.target || 'x64' }}-windows
+
     steps:
       - run: md build
         working-directory:
-      - uses: msys2/setup-msys2@v2
-        id: setup-msys2
-        with:
-          update: true
-          install: >-
-            patch
-        if: ${{ env.OS_VER != 'windows-2019' }}
-      - name: patch path
-        shell: msys2 {0}
-        run: echo PATCH=$(cygpath -wa $(command -v patch)) >> $GITHUB_ENV
-        if: ${{ steps.setup-msys2.outcome == 'success' }}
-      - uses: actions/cache@v3
+
+      - uses: ruby/setup-ruby@b90be12699fdfcbee4440c2bba85f6f460446bb0 # v1.279.0
         with:
-          path: C:\vcpkg\downloads
-          key: ${{ runner.os }}-vcpkg-download-${{ env.OS_VER }}-${{ github.sha }}
-          restore-keys: |
-            ${{ runner.os }}-vcpkg-download-${{ env.OS_VER }}-
-            ${{ runner.os }}-vcpkg-download-
-      - uses: actions/cache@v3
+          # windows-11-arm has only 3.4.1, 3.4.2, 3.4.3, head
+          ruby-version: ${{ !endsWith(matrix.os, 'arm') && '3.1' || '3.4' }}
+          bundler: none
+          windows-toolchain: none
+
+      - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
         with:
-          path: C:\vcpkg\installed
-          key: ${{ runner.os }}-vcpkg-installed-${{ matrix.os }}-${{ github.sha }}
-          restore-keys: |
-            ${{ runner.os }}-vcpkg-installed-${{ matrix.os }}-
-            ${{ runner.os }}-vcpkg-installed-
-      - name: Install libraries with vcpkg
-        run: |
-          vcpkg --triplet x64-windows install libffi libyaml openssl readline zlib
-      - uses: actions/cache@v3
+          sparse-checkout-cone-mode: false
+          sparse-checkout: /.github
+
+      - uses: ./.github/actions/setup/directories
         with:
-          path: C:\Users\runneradmin\AppData\Local\Temp\chocolatey
-          key: ${{ runner.os }}-chocolatey-${{ env.OS_VER }}-${{ github.sha }}
-          restore-keys: |
-            ${{ runner.os }}-chocolatey-${{ env.OS_VER }}-
-            ${{ runner.os }}-chocolatey-
-      - name: Install libraries with chocolatey
+          srcdir: src
+          builddir: build
+          make-command: nmake
+          clean: true
+
+      - name: Install tools with scoop
         run: |
-          # Using Choco-Install for retries, but it doesn't detect failures properly
-          # if you pass multiple package names in a single command.
-          Choco-Install -PackageName winflexbison3
+          Set-ExecutionPolicy -ExecutionPolicy RemoteSigned -Scope CurrentUser
+          iwr -useb get.scoop.sh | iex
+          Join-Path (Resolve-Path ~).Path "scoop\shims" >> $Env:GITHUB_PATH
+          scoop install vcpkg uutils-coreutils
         shell: pwsh
-      - name: git config
-        run: |
-          git config --global core.autocrlf false
-          git config --global core.eol lf
-          git config --global advice.detachedHead 0
-          git config --global init.defaultBranch garbage
-      - uses: actions/checkout@v3
+
+      - name: Restore vcpkg artifact
+        id: restore-vcpkg
+        uses: actions/cache/restore@8b402f58fbc84540c8b491a91e594a4576fec3d7 # v5.0.2
         with:
-          path: src
-      - uses: actions/cache@v3
+          path: src\vcpkg_installed
+          key: windows-${{ matrix.os }}-vcpkg-${{ hashFiles('src/vcpkg.json') }}
+
+      - name: Install libraries with vcpkg
+        run: |
+          vcpkg install --vcpkg-root=%USERPROFILE%\scoop\apps\vcpkg\current
+        working-directory: src
+        if: ${{ ! steps.restore-vcpkg.outputs.cache-hit }}
+
+      - name: Save vcpkg artifact
+        uses: actions/cache/save@8b402f58fbc84540c8b491a91e594a4576fec3d7 # v5.0.2
         with:
-          path: src/.downloaded-cache
-          key: downloaded-cache
+          path: src\vcpkg_installed
+          key: windows-${{ matrix.os }}-vcpkg-${{ hashFiles('src/vcpkg.json') }}
+        if: ${{ ! steps.restore-vcpkg.outputs.cache-hit && (github.ref_name == 'master' || startsWith(github.ref_name, 'ruby_')) }}
+
       - name: setup env
+        # Available Ruby versions: https://github.com/actions/runner-images/blob/main/images/windows/Windows2019-Readme.md#ruby
         # %TEMP% is inconsistent with %TMP% and test-all expects they are consistent.
         # https://github.com/actions/virtual-environments/issues/712#issuecomment-613004302
         run: |
-          set VS=${{ matrix.vs }}
-          set VCVARS=${{ matrix.vcvars }}
-          if not "%VCVARS%" == "" goto :vcset
-            set VCVARS="C:\Program Files (x86)\Microsoft Visual Studio\%VS%\Enterprise\VC\Auxiliary\Build\vcvars64.bat"
-            if not exist %VCVARS% set VCVARS="C:\Program Files\Microsoft Visual Studio\%VS%\Enterprise\VC\Auxiliary\Build\vcvars64.bat"
-          :vcset
-          set | C:\msys64\usr\bin\sort > old.env
-          call %VCVARS%
-          set TMP=%USERPROFILE%\AppData\Local\Temp
-          set TEMP=%USERPROFILE%\AppData\Local\Temp
+          ::- Set up VC ${{ matrix.vc }}
+          set | sort > old.env
+          call ..\src\win32\vssetup.cmd ^
+            -arch=${{ matrix.target || 'amd64' }} ^
+            ${{ matrix.vcvars && '-vcvars_ver=' || '' }}${{ matrix.vcvars }}
+          nmake -f nul
+          set TMP=%RUNNER_TEMP%
+          set TEMP=%RUNNER_TEMP%
+          set MAKEFLAGS=l
           set /a TEST_JOBS=(15 * %NUMBER_OF_PROCESSORS% / 10) > nul
-          set | C:\msys64\usr\bin\sort > new.env
-          C:\msys64\usr\bin\comm -13 old.env new.env >> %GITHUB_ENV%
+          set RUBY_OPT_DIR=%GITHUB_WORKSPACE:\=/%/src/vcpkg_installed/%VCPKG_DEFAULT_TRIPLET%
+          set | sort > new.env
+          comm -13 old.env new.env >> %GITHUB_ENV%
           del *.env
-      - name: link libraries
-        run: |
-          for %%I in (C:\vcpkg\installed\x64-windows\bin\*.dll) do (
-            if not %%~nI == readline mklink %%~nxI %%I
-          )
-          for %%I in (libcrypto-1_1-x64 libssl-1_1-x64) do (
-            ren c:\Windows\System32\%%I.dll %%I.dll_
-          )
+
+      - name: baseruby version
+        run: ruby -v
+
+      - name: compiler version
+        run: cl
+
+      - name: volume info
+        run: Get-Volume
+        shell: pwsh
+
+      # TODO: We should use `../src` instead of `D:/a/ruby/ruby/src`
       - name: Configure
         run: >-
           ../src/win32/configure.bat --disable-install-doc
-          --with-opt-dir=C:/vcpkg/installed/x64-windows
+          --with-opt-dir=%RUBY_OPT_DIR%
+          --with-gmp
+
+      - run: nmake prepare-vcpkg
+
       - run: nmake incs
+
       - run: nmake extract-extlibs
+
+      # On all other platforms, test-spec depending on extract-gems (in common.mk) is enough.
+      # But not for this Visual Studio workflow. So here we extract gems before building.
+      - run: nmake extract-gems
+
+      # windows-11-arm runner cannot run `ruby tool/file2lastrev.rb --revision.h --output=revision.h`
+      - name: make revision.h
+        run: |
+          win32\lastrev.bat | win32\ifchange.bat --timestamp=.revision.time revision.h -
+          type revision.h
+        working-directory: src
+
       - run: nmake
-        env:
-          YACC: win_bison
-      - run: nmake test
-        timeout-minutes: 5
-      - run: nmake test-all
-        env:
-          RUBY_TESTOPTS: -j${{env.TEST_JOBS}} --job-status=normal
-        timeout-minutes: 60
-        continue-on-error: ${{ matrix.continue-on-error || false }}
-      - run: nmake test-spec
-        timeout-minutes: 10
-        continue-on-error: ${{ matrix.continue-on-error || false }}
-      - uses: k0kubun/action-slack@v2.0.0
+
+      - name: Set up Launchable
+        uses: ./.github/actions/launchable/setup
         with:
-          payload: |
-            {
-              "ci": "GitHub Actions",
-              "env": "VS${{ matrix.vs }} / ${{ matrix.test_task || 'check' }}",
-              "url": "https://github.com/${{ github.repository }}/actions/runs/${{ github.run_id }}",
-              "commit": "${{ github.sha }}",
-              "branch": "${{ github.ref }}".split('/').reverse()[0]
-            }
+          os: windows-${{ matrix.os }}
+          launchable-token: ${{ secrets.LAUNCHABLE_TOKEN }}
+          builddir: build
+          srcdir: src
+          test-task: ${{ matrix.test_task || 'check' }}
+        continue-on-error: true
+        if: ${{ matrix.test_task != 'test-bundled-gems' }}
+        timeout-minutes: 3
+
+      - run: nmake ${{ matrix.test_task || 'check' }}
         env:
+          RUBY_TESTOPTS: -j${{ env.TEST_JOBS || 4 }}
+        timeout-minutes: 70
+
+      - uses: ./.github/actions/slack
+        with:
+          label: Windows ${{ matrix.os }} / VC ${{ matrix.vc }} / ${{ matrix.test_task || 'check' }}
           SLACK_WEBHOOK_URL: ${{ secrets.SIMPLER_ALERTS_URL }} # ruby-lang slack: ruby/simpler-alerts-bot
-        if: ${{ failure() && github.event_name == 'push' }}
+        if: ${{ failure() }}
+
+  result:
+    if: ${{ always() }}
+    name: ${{ github.workflow }} result
+    runs-on: windows-latest
+    needs: [make]
+    steps:
+      - run: exit 1
+        working-directory:
+        if: ${{ contains(needs.*.result, 'failure') || contains(needs.*.result, 'cancelled') }}
 
 defaults:
   run:
diff --git a/.github/workflows/wsl.yml b/.github/workflows/wsl.yml
new file mode 100644
index 0000000000..640f18ce42
--- /dev/null
+++ b/.github/workflows/wsl.yml
@@ -0,0 +1,70 @@
+name: Ubuntu on WSL
+
+on:
+  push:
+    paths-ignore:
+      - 'doc/**'
+      - '**/man/*'
+      - '**.md'
+      - '**.rdoc'
+      - '**/.document'
+      - '.*.yml'
+  pull_request:
+    # Do not use paths-ignore for required status checks
+    # https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/collaborating-on-repositories-with-code-quality-features/troubleshooting-required-status-checks#handling-skipped-but-required-checks
+  merge_group:
+
+jobs:
+  wsl:
+    runs-on: windows-2025
+
+    if: >-
+      ${{!(false
+      || contains(github.event.head_commit.message, '[DOC]')
+      || contains(github.event.pull_request.title, '[DOC]')
+      || contains(github.event.pull_request.labels.*.name, 'Documentation')
+      || (github.event_name == 'push' && github.event.pull_request.user.login == 'dependabot[bot]')
+      )}}
+
+    steps:
+      - name: Install or update WSL
+        uses: Ubuntu/WSL/.github/actions/wsl-install@main
+        with:
+          distro: Ubuntu-24.04
+
+      - name: Install dependencies
+        uses: Ubuntu/WSL/.github/actions/wsl-bash@main
+        with:
+         distro: Ubuntu-24.04
+         working-dir: /tmp/github/
+         exec: |
+            DEBIAN_FRONTEND=noninteractive sudo apt update
+            DEBIAN_FRONTEND=noninteractive sudo apt install -y ruby build-essential autoconf libssl-dev libyaml-dev zlib1g-dev libgmp-dev libffi-dev
+
+      - name: Check out the repository
+        uses: Ubuntu/WSL/.github/actions/wsl-checkout@main
+        with:
+          distro: Ubuntu-24.04
+          working-dir: /tmp/github/
+          submodules: true
+
+      - name: Build
+        uses: Ubuntu/WSL/.github/actions/wsl-bash@main
+        with:
+         distro: Ubuntu-24.04
+         working-dir: /tmp/github/
+         exec: |
+            ./autogen.sh
+            ./configure --disable-install-doc
+            make ruby -j4
+            make extract-gems
+            make -j4
+
+      - name: Test
+        uses: Ubuntu/WSL/.github/actions/wsl-bash@main
+        with:
+         distro: Ubuntu-24.04
+         working-dir: /tmp/github/
+         exec: |
+            ./ruby -v
+            # make check TESTS="-j4" MSPECOPT="-j"
diff --git a/.github/workflows/yjit-macos.yml b/.github/workflows/yjit-macos.yml
new file mode 100644
index 0000000000..a59b4d6508
--- /dev/null
+++ b/.github/workflows/yjit-macos.yml
@@ -0,0 +1,198 @@
+name: YJIT macOS
+on:
+  push:
+    branches:
+      - master
+    paths-ignore:
+      - 'doc/**'
+      - '**/man/*'
+      - '**.md'
+      - '**.rdoc'
+      - '**/.document'
+      - '.*.yml'
+  pull_request:
+    types:
+      - opened
+      - synchronize
+      - reopened
+    # Do not use paths-ignore for required status checks
+    # https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/collaborating-on-repositories-with-code-quality-features/troubleshooting-required-status-checks#handling-skipped-but-required-checks
+  merge_group:
+
+concurrency:
+  group: ${{ github.workflow }} / ${{ startsWith(github.event_name, 'pull') && github.ref_name || github.sha }}
+  cancel-in-progress: ${{ startsWith(github.event_name, 'pull') }}
+
+permissions:
+  contents: read
+
+jobs:
+  cargo:
+    name: cargo test
+
+    runs-on: macos-14
+
+    if: >-
+      ${{!(false
+      || contains(github.event.head_commit.message, '[DOC]')
+      || contains(github.event.pull_request.title, '[DOC]')
+      || contains(github.event.pull_request.labels.*.name, 'Documentation')
+      || (github.event_name == 'push' && github.event.pull_request.user.login == 'dependabot[bot]')
+      )}}
+
+    steps:
+      - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
+
+      - run: RUST_BACKTRACE=1 cargo test
+        working-directory: yjit
+
+      # Also compile and test with all features enabled
+      - run: RUST_BACKTRACE=1 cargo test --all-features
+        working-directory: yjit
+
+      # Check that we can build in release mode too
+      - run: cargo build --release
+        working-directory: yjit
+
+  make:
+    strategy:
+      matrix:
+        include:
+          - test_task: 'check'
+            configure: '--enable-yjit'
+            yjit_opts: '--yjit'
+          - test_task: 'check'
+            configure: '--enable-yjit=dev'
+            yjit_opts: '--yjit-call-threshold=1 --yjit-verify-ctx --yjit-code-gc'
+            specopts: '-T --yjit-call-threshold=1 -T --yjit-verify-ctx -T --yjit-code-gc'
+      fail-fast: false
+
+    env:
+      GITPULLOPTIONS: --no-tags origin ${{ github.ref }}
+      RUN_OPTS: ${{ matrix.yjit_opts }}
+      SPECOPTS: ${{ matrix.specopts }}
+
+    runs-on: macos-14
+
+    if: >-
+      ${{!(false
+      || contains(github.event.head_commit.message, '[DOC]')
+      || contains(github.event.pull_request.title, '[DOC]')
+      || contains(github.event.pull_request.labels.*.name, 'Documentation')
+      || (github.event_name == 'push' && github.event.pull_request.user.login == 'dependabot[bot]')
+      )}}
+
+    steps:
+      - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
+        with:
+          sparse-checkout-cone-mode: false
+          sparse-checkout: /.github
+
+      - name: Install libraries
+        uses: ./.github/actions/setup/macos
+
+      - uses: ./.github/actions/setup/directories
+        with:
+          srcdir: src
+          builddir: build
+          makeup: true
+          dummy-files: ${{ matrix.test_task == 'check' }}
+          # Set fetch-depth: 10 so that Launchable can receive commits information.
+          fetch-depth: 10
+
+      - name: Run configure
+        run: ../src/configure -C --disable-install-doc ${{ matrix.configure }}
+
+      - run: make prepare-gems
+        if: ${{ matrix.test_task == 'test-bundled-gems' }}
+
+      - run: make
+
+      - name: Verify that --yjit-dump-disasm works
+        run: |
+          ./miniruby --yjit-call-threshold=1 --yjit-dump-disasm -e0 | \
+          wc -l | \
+          ruby -ne 'raise "Disassembly seems broken in dev build (output has too few lines)" unless $_.to_i > 10'
+        if: ${{ contains(matrix.configure, 'jit=dev') }}
+
+      - name: Set ENV for YJIT
+        run: |
+          echo "RUBY_YJIT_ENABLE=1" >> $GITHUB_ENV
+          echo "RUBY_CRASH_REPORT=$(pwd)/rb_crash_%p.txt" >> $GITHUB_ENV
+
+      - name: Set test options for skipped tests
+        run: |
+          set -x
+          TESTS="$(echo "${{ matrix.skipped_tests }}" | sed 's| |$$/ -n!/|g;s|^|-n!/|;s|$|$$/|')"
+          echo "TESTS=${TESTS}" >> $GITHUB_ENV
+        if: ${{ matrix.test_task == 'check' && matrix.skipped_tests }}
+
+      - name: Set up Launchable
+        id: launchable
+        uses: ./.github/actions/launchable/setup
+        with:
+          os: macos-14
+          test-opts: ${{ matrix.configure }}
+          launchable-token: ${{ secrets.LAUNCHABLE_TOKEN }}
+          builddir: build
+          srcdir: src
+          is-yjit: true
+        continue-on-error: true
+        timeout-minutes: 3
+
+      - name: make ${{ matrix.test_task }}
+        run: |
+          test -n "${LAUNCHABLE_STDOUT}" && exec 1> >(tee "${LAUNCHABLE_STDOUT}")
+          test -n "${LAUNCHABLE_STDERR}" && exec 2> >(tee "${LAUNCHABLE_STDERR}")
+
+          set -x
+          make -s ${{ matrix.test_task }} ${TESTS:+TESTS="$TESTS"} \
+            RUN_OPTS="$RUN_OPTS" \
+            SPECOPTS="$SPECOPTS"
+        timeout-minutes: 60
+        env:
+          RUBY_TESTOPTS: '-q --tty=no'
+          TEST_BUNDLED_GEMS_ALLOW_FAILURES: ''
+          SYNTAX_SUGGEST_TIMEOUT: '5'
+          PRECHECK_BUNDLED_GEMS: 'no'
+          LAUNCHABLE_STDOUT: ${{ steps.launchable.outputs.stdout_report_path }}
+          LAUNCHABLE_STDERR: ${{ steps.launchable.outputs.stderr_report_path }}
+        continue-on-error: ${{ matrix.continue-on-test_task || false }}
+
+      - name: make skipped tests
+        run: |
+          make -s test-all TESTS="${TESTS//-n!\//-n/}"
+        env:
+          GNUMAKEFLAGS: ''
+          RUBY_TESTOPTS: '-v --tty=no'
+          PRECHECK_BUNDLED_GEMS: 'no'
+        if: ${{ matrix.test_task == 'check' && matrix.skipped_tests }}
+        continue-on-error: ${{ matrix.continue-on-skipped_tests || false }}
+
+      - name: Dump crash logs
+        if: ${{ failure() }}
+        continue-on-error: true
+        run: |
+          tail --verbose --lines=+1 rb_crash_*.txt
+          exit 1
+
+      - uses: ./.github/actions/slack
+        with:
+          label: ${{ matrix.test_task }} ${{ matrix.configure }} ${{ matrix.yjit_opts }}
+          SLACK_WEBHOOK_URL: ${{ secrets.SIMPLER_ALERTS_URL }} # ruby-lang slack: ruby/simpler-alerts-bot
+        if: ${{ failure() }}
+
+  result:
+    if: ${{ always() }}
+    name: ${{ github.workflow }} result
+    runs-on: macos-14
+    needs: [make]
+    steps:
+      - name: ${{ github.workflow }} jobs have failed
+        run: exit 1
+        working-directory:
+        if: ${{ contains(needs.*.result, 'failure') || contains(needs.*.result, 'cancelled') }}
+
+defaults:
+  run:
+    working-directory: build
diff --git a/.github/workflows/yjit-ubuntu.yml b/.github/workflows/yjit-ubuntu.yml
index 5dac4375f2..150f0b3275 100644
--- a/.github/workflows/yjit-ubuntu.yml
+++ b/.github/workflows/yjit-ubuntu.yml
@@ -3,127 +3,237 @@ on:
   push:
     paths-ignore:
       - 'doc/**'
+      - '**/man/*'
       - '**.md'
       - '**.rdoc'
+      - '**/.document'
+      - '.*.yml'
   pull_request:
-    paths-ignore:
-      - 'doc/**'
-      - '**.md'
-      - '**.rdoc'
+    # Do not use paths-ignore for required status checks
+    # https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/collaborating-on-repositories-with-code-quality-features/troubleshooting-required-status-checks#handling-skipped-but-required-checks
+  merge_group:
 
 concurrency:
   group: ${{ github.workflow }} / ${{ startsWith(github.event_name, 'pull') && github.ref_name || github.sha }}
   cancel-in-progress: ${{ startsWith(github.event_name, 'pull') }}
 
+permissions:
+  contents: read
+
 jobs:
   cargo:
-    name: Rust cargo test
+    name: cargo test
+
     # GitHub Action's image seems to already contain a Rust 1.58.0.
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-22.04
+
+    if: >-
+      ${{!(false
+      || contains(github.event.head_commit.message, '[DOC]')
+      || contains(github.event.pull_request.title, '[DOC]')
+      || contains(github.event.pull_request.labels.*.name, 'Documentation')
+      || (github.event_name == 'push' && github.event.pull_request.user.login == 'dependabot[bot]')
+      )}}
+
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
+
       # For now we can't run cargo test --offline because it complains about the
       # capstone dependency, even though the dependency is optional
       #- run: cargo test --offline
+
       - run: RUST_BACKTRACE=1 cargo test
         working-directory: yjit
+
       # Also compile and test with all features enabled
       - run: RUST_BACKTRACE=1 cargo test --all-features
         working-directory: yjit
+
       # Check that we can build in release mode too
       - run: cargo build --release
         working-directory: yjit
+
+  lint:
+    name: cargo clippy
+
+    # GitHub Action's image seems to already contain a Rust 1.58.0.
+    runs-on: ubuntu-22.04
+
+    if: >-
+      ${{!(false
+      || contains(github.event.head_commit.message, '[DOC]')
+      || contains(github.event.pull_request.title, '[DOC]')
+      || contains(github.event.pull_request.labels.*.name, 'Documentation')
+      || (github.event_name == 'push' && github.event.pull_request.user.login == 'dependabot[bot]')
+      )}}
+
+    steps:
+      - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
+
+      # Check that we don't have linting errors in release mode, too
+      - run: cargo clippy --all-targets --all-features
+        working-directory: yjit
+
   make:
     strategy:
       fail-fast: false
       matrix:
         include:
-          - test_task: "check-yjit-bindings"
-            configure: "--with-gcc=clang-12 --enable-yjit=dev"
+          - test_task: 'yjit-bindgen'
+            hint: 'To fix: use patch in logs'
+            # Build with YJIT+ZJIT for output that works in the most number of configurations
+            configure: '--with-gcc=clang-14 --enable-yjit=dev --enable-zjit'
+            libclang_path: '/usr/lib/llvm-14/lib/libclang.so.1'
 
-          - test_task: "check"
-            configure: "--enable-yjit" # release build
+          - test_task: 'check'
+            # YJIT should be automatically built in release mode on x86-64 Linux with rustc present
+            #configure: "--enable-yjit RUSTC='rustc +1.58.0'"
+            configure: "RUSTC='rustc +1.58.0'"
+            rust_version: '1.58.0'
 
-          - test_task: "check"
-            configure: "--enable-yjit=dev"
+          - test_task: 'check'
+            configure: '--enable-yjit=dev'
 
-          - test_task: "check"
-            configure: "--enable-yjit=dev"
-            yjit_opts: "--yjit-call-threshold=1"
+          - test_task: 'check'
+            configure: '--enable-yjit=dev'
+            yjit_opts: '--yjit-call-threshold=1 --yjit-verify-ctx --yjit-code-gc'
+            specopts: '-T --yjit-call-threshold=1 -T --yjit-verify-ctx -T --yjit-code-gc'
 
-          - test_task: "test-all TESTS=--repeat-count=2"
-            configure: "--enable-yjit=dev"
+          - test_task: 'test-bundled-gems'
+            configure: '--enable-yjit=dev'
 
-          - test_task: "test-bundled-gems"
-            configure: "--enable-yjit=dev"
     env:
-      GITPULLOPTIONS: --no-tags origin ${{github.ref}}
+      GITPULLOPTIONS: --no-tags origin ${{ github.ref }}
       RUN_OPTS: ${{ matrix.yjit_opts }}
+      YJIT_BENCH_OPTS: ${{ matrix.yjit_bench_opts }}
+      SPECOPTS: ${{ matrix.specopts }}
       RUBY_DEBUG: ci
-    runs-on: ubuntu-20.04
-    if: ${{ !startsWith(github.event.head_commit.message, '[DOC]') && !contains(github.event.pull_request.labels.*.name, 'Documentation') }}
+      RUST_BACKTRACE: 1
+
+    runs-on: ubuntu-22.04
+
+    if: >-
+      ${{!(false
+      || contains(github.event.head_commit.message, '[DOC]')
+      || contains(github.event.pull_request.title, '[DOC]')
+      || contains(github.event.pull_request.labels.*.name, 'Documentation')
+      || (github.event_name == 'push' && github.event.pull_request.user.login == 'dependabot[bot]')
+      )}}
+
     steps:
-      - run: mkdir build
-        working-directory:
-      - name: Install libraries
-        run: |
-          set -x
-          sudo apt-get update -q || :
-          sudo apt-get install --no-install-recommends -q -y build-essential libssl-dev libyaml-dev libreadline6-dev zlib1g-dev libncurses5-dev libffi-dev bison autoconf ruby
-      - name: git config
-        run: |
-          git config --global advice.detachedHead 0
-          git config --global init.defaultBranch garbage
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
         with:
-          path: src
-      - uses: actions/cache@v3
+          sparse-checkout-cone-mode: false
+          sparse-checkout: /.github
+
+      - uses: ./.github/actions/setup/ubuntu
+
+      - uses: ruby/setup-ruby@b90be12699fdfcbee4440c2bba85f6f460446bb0 # v1.279.0
         with:
-          path: src/.downloaded-cache
-          key: downloaded-cache
-      - name: Fixed world writable dirs
-        run: |
-          chmod -v go-w $HOME $HOME/.config
-          sudo chmod -R go-w /usr/share
-          sudo bash -c 'IFS=:; for d in '"$PATH"'; do chmod -v go-w $d; done' || :
-      - name: Set ENV
-        run: |
-          echo "GNUMAKEFLAGS=-j$((1 + $(nproc --all)))" >> $GITHUB_ENV
-      - run: ./autogen.sh
-        working-directory: src
+          ruby-version: '3.1'
+          bundler: none
+
+      - uses: ./.github/actions/setup/directories
+        with:
+          srcdir: src
+          builddir: build
+          makeup: true
+          dummy-files: ${{ matrix.test_task == 'check' }}
+          # Set fetch-depth: 10 so that Launchable can receive commits information.
+          fetch-depth: 10
+
+      - name: Install Rust
+        if: ${{ matrix.rust_version }}
+        run: rustup install ${{ matrix.rust_version }} --profile minimal
+
+      - name: Remove cargo
+        # Since this tests a `rustc` build for release, remove `cargo` to ensure
+        # that only `rustc` is used.
+        if: ${{ contains(matrix.configure, 'rustc') }}
+        run: sudo rm $(which -a cargo | uniq)
+
       - name: Run configure
-        run: ../src/configure -C --disable-install-doc ${{ matrix.configure }}
+        run: ../src/configure -C --disable-install-doc --prefix=$(pwd)/install ${{ matrix.configure }}
+
       - run: make incs
-      - run: make -j
-      - run: make leaked-globals
-        if: ${{ matrix.test_task == 'check' }}
+
       - run: make prepare-gems
-        if: ${{ matrix.test_task == 'check' }}
-      - name: Create dummy files in build dir
+        if: ${{ matrix.test_task == 'test-bundled-gems' }}
+
+      - run: make
+
+      - name: Verify that --yjit-dump-disasm works
         run: |
-          ./miniruby -e '(("a".."z").to_a+("A".."Z").to_a+("0".."9").to_a+%w[foo bar test zzz]).each{|basename|File.write("#{basename}.rb", "raise %(do not load #{basename}.rb)")}'
-        if: ${{ matrix.test_task == 'check' }}
-      - name: Enable YJIT through ENV
-        run: echo "RUBY_YJIT_ENABLE=1" >> $GITHUB_ENV
-      - run: make -s ${{ matrix.test_task }} RUN_OPTS="$RUN_OPTS"
-        timeout-minutes: 60
-        env:
-          RUBY_TESTOPTS: "-q --tty=no"
-          TEST_BUNDLED_GEMS_ALLOW_FAILURES: ""
-          PRECHECK_BUNDLED_GEMS: "no"
-      - uses: k0kubun/action-slack@v2.0.0
+          ./miniruby --yjit-call-threshold=1 --yjit-dump-disasm -e0 | \
+          wc -l | \
+          ruby -ne 'raise "Disassembly seems broken in dev build (output has too few lines)" unless $_.to_i > 10'
+        if: ${{ contains(matrix.configure, 'jit=dev') }}
+
+      - name: Set ENV for YJIT
+        run: |
+          echo "RUBY_YJIT_ENABLE=1" >> $GITHUB_ENV
+          echo "RUBY_CRASH_REPORT=$(pwd)/rb_crash_%p.txt" >> $GITHUB_ENV
+
+      # Check that the binary was built with YJIT
+      - name: Check YJIT enabled
+        run: ./miniruby --yjit -v | grep "+YJIT"
+
+      - name: Set up Launchable
+        id: launchable
+        uses: ./.github/actions/launchable/setup
         with:
-          payload: |
-            {
-              "ci": "GitHub Actions",
-              "env": "${{ matrix.os }} / ${{ matrix.test_task }}${{ matrix.configure }}",
-              "url": "https://github.com/${{ github.repository }}/actions/runs/${{ github.run_id }}",
-              "commit": "${{ github.sha }}",
-              "branch": "${{ github.ref }}".split('/').reverse()[0]
-            }
+          os: ubuntu-22.04
+          test-opts: ${{ matrix.configure }}
+          launchable-token: ${{ secrets.LAUNCHABLE_TOKEN }}
+          builddir: build
+          srcdir: src
+          is-yjit: true
+        continue-on-error: true
+        timeout-minutes: 3
+
+      - name: make ${{ matrix.test_task }}
+        run: |
+          test -n "${LAUNCHABLE_STDOUT}" && exec 1> >(tee "${LAUNCHABLE_STDOUT}")
+          test -n "${LAUNCHABLE_STDERR}" && exec 2> >(tee "${LAUNCHABLE_STDERR}")
+
+          set -x
+          make -s ${{ matrix.test_task }} ${TESTS:+TESTS="$TESTS"} \
+            RUN_OPTS="$RUN_OPTS" MSPECOPT=--debug SPECOPTS="$SPECOPTS" \
+            YJIT_BENCH_OPTS="$YJIT_BENCH_OPTS" YJIT_BINDGEN_DIFF_OPTS="$YJIT_BINDGEN_DIFF_OPTS"
+        timeout-minutes: 90
         env:
+          RUBY_TESTOPTS: '-q --tty=no'
+          TEST_BUNDLED_GEMS_ALLOW_FAILURES: ''
+          PRECHECK_BUNDLED_GEMS: 'no'
+          SYNTAX_SUGGEST_TIMEOUT: '5'
+          YJIT_BINDGEN_DIFF_OPTS: '--exit-code'
+          LIBCLANG_PATH: ${{ matrix.libclang_path }}
+          LAUNCHABLE_STDOUT: ${{ steps.launchable.outputs.stdout_report_path }}
+          LAUNCHABLE_STDERR: ${{ steps.launchable.outputs.stderr_report_path }}
+        continue-on-error: ${{ matrix.continue-on-test_task || false }}
+
+      - name: Dump crash logs
+        if: ${{ failure() }}
+        continue-on-error: true
+        run: |
+          tail --verbose --lines=+1 rb_crash_*.txt
+          exit 1
+
+      - uses: ./.github/actions/slack
+        with:
+          label: ${{ matrix.test_task }} ${{ matrix.configure }}
           SLACK_WEBHOOK_URL: ${{ secrets.SIMPLER_ALERTS_URL }} # ruby-lang slack: ruby/simpler-alerts-bot
-        if: ${{ failure() && github.event_name == 'push' }}
+        if: ${{ failure() }}
+
+  result:
+    if: ${{ always() }}
+    name: ${{ github.workflow }} result
+    runs-on: ubuntu-latest
+    needs: [make]
+    steps:
+      - run: exit 1
+        working-directory:
+        if: ${{ contains(needs.*.result, 'failure') || contains(needs.*.result, 'cancelled') }}
 
 defaults:
   run:
diff --git a/.github/workflows/zjit-macos.yml b/.github/workflows/zjit-macos.yml
new file mode 100644
index 0000000000..a638907811
--- /dev/null
+++ b/.github/workflows/zjit-macos.yml
@@ -0,0 +1,214 @@
+name: ZJIT macOS
+on:
+  push:
+    branches:
+      - master
+    paths-ignore:
+      - 'doc/**'
+      - '**/man/*'
+      - '**.md'
+      - '**.rdoc'
+      - '**/.document'
+      - '.*.yml'
+  pull_request:
+    types:
+      - opened
+      - synchronize
+      - reopened
+    # Do not use paths-ignore for required status checks
+    # https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/collaborating-on-repositories-with-code-quality-features/troubleshooting-required-status-checks#handling-skipped-but-required-checks
+  merge_group:
+
+concurrency:
+  group: ${{ github.workflow }} / ${{ startsWith(github.event_name, 'pull') && github.ref_name || github.sha }}
+  cancel-in-progress: ${{ startsWith(github.event_name, 'pull') }}
+
+permissions:
+  contents: read
+
+jobs:
+  make:
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - test_task: 'check'
+            run_opts: '--zjit-call-threshold=1'
+            specopts: '-T --zjit-call-threshold=1'
+            configure: '--enable-zjit=dev'
+
+          - test_task: 'check'
+            run_opts: '--zjit-disable-hir-opt --zjit-call-threshold=1'
+            specopts: '-T --zjit-disable-hir-opt -T --zjit-call-threshold=1'
+            configure: '--enable-zjit=dev'
+
+          - test_task: 'zjit-check' # zjit-test + quick feedback of test_zjit.rb
+            configure: '--enable-yjit=dev --enable-zjit'
+            rust_version: "1.85.0"
+
+          - test_task: 'ruby'
+            hint: 'combo build test'
+            configure: '--enable-yjit --enable-zjit'
+
+    env:
+      GITPULLOPTIONS: --no-tags origin ${{ github.ref }}
+      RUN_OPTS: ${{ matrix.run_opts }}
+      SPECOPTS: ${{ matrix.specopts }}
+      TESTOPTS: ${{ matrix.testopts }}
+      ZJIT_RB_BUG: 1
+
+    runs-on: macos-14
+
+    if: >-
+      ${{!(false
+      || contains(github.event.head_commit.message, '[DOC]')
+      || contains(github.event.pull_request.title, '[DOC]')
+      || contains(github.event.pull_request.labels.*.name, 'Documentation')
+      || (github.event_name == 'push' && github.event.pull_request.user.login == 'dependabot[bot]')
+      )}}
+
+    steps:
+      - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
+        with:
+          sparse-checkout-cone-mode: false
+          sparse-checkout: /.github
+
+      - name: Install libraries
+        uses: ./.github/actions/setup/macos
+
+      - uses: ./.github/actions/setup/directories
+        with:
+          srcdir: src
+          builddir: build
+          makeup: true
+          dummy-files: ${{ matrix.test_task == 'check' }}
+          # Set fetch-depth: 10 so that Launchable can receive commits information.
+          fetch-depth: 10
+
+      - name: Install Rust
+        if: ${{ matrix.rust_version }}
+        run: |
+          rustup install ${{ matrix.rust_version }} --profile minimal
+          rustup default ${{ matrix.rust_version }}
+
+      - uses: taiki-e/install-action@v2
+        with:
+          tool: nextest@0.9
+        if: ${{ matrix.test_task == 'zjit-check' }}
+
+      - name: Run configure
+        run: ../src/configure -C --disable-install-doc ${{ matrix.configure }}
+
+      - run: make
+
+      - name: Verify that --zjit-dump-disasm works
+        run: |
+          ./miniruby --zjit-call-threshold=1 --zjit-dump-disasm -e0 | \
+          wc -l | \
+          ruby -ne 'raise "Disassembly seems broken in dev build (output has too few lines)" unless $_.to_i > 10'
+        if: ${{ contains(matrix.configure, 'jit=dev') }}
+
+      - name: Set ENV for ZJIT
+        run: |
+          echo "RUBY_CRASH_REPORT=$(pwd)/rb_crash_%p.txt" >> $GITHUB_ENV
+
+      - name: make ${{ matrix.test_task }}
+        run: |
+          set -x
+          make -s ${{ matrix.test_task }} ${TESTS:+TESTS="$TESTS"} \
+            RUN_OPTS="$RUN_OPTS" \
+            SPECOPTS="$SPECOPTS" \
+            TESTOPTS="$TESTOPTS"
+        timeout-minutes: 60
+        env:
+          RUBY_TESTOPTS: '-q --tty=no'
+          EXCLUDES: '../src/test/.excludes-zjit'
+          TEST_BUNDLED_GEMS_ALLOW_FAILURES: ''
+          SYNTAX_SUGGEST_TIMEOUT: '5'
+          PRECHECK_BUNDLED_GEMS: 'no'
+        continue-on-error: ${{ matrix.continue-on-test_task || false }}
+
+      - name: Dump crash logs
+        if: ${{ failure() }}
+        continue-on-error: true
+        run: |
+          tail --verbose --lines=+1 rb_crash_*.txt
+          exit 1
+
+      - uses: ./.github/actions/slack
+        with:
+          label: ${{ matrix.test_task }} ${{ matrix.configure }}
+          SLACK_WEBHOOK_URL: ${{ secrets.SIMPLER_ALERTS_URL }} # ruby-lang slack: ruby/simpler-alerts-bot
+        if: ${{ failure() }}
+
+  result:
+    if: ${{ always() }}
+    name: ${{ github.workflow }} result
+    runs-on: macos-14
+    needs: [make]
+    steps:
+      - run: exit 1
+        working-directory:
+        if: ${{ contains(needs.*.result, 'failure') || contains(needs.*.result, 'cancelled') }}
+
+  # Separated from `make` job to avoid making it a required status check for now
+  ruby-bench:
+    strategy:
+      matrix:
+        include:
+          # Test --call-threshold=2 with 2 iterations in total
+          - ruby_opts: '--zjit-call-threshold=2'
+            bench_opts: '--warmup=1 --bench=1 --excludes=lobsters'
+            configure: '--enable-zjit=dev_nodebug' # --enable-zjit=dev is too slow
+
+    runs-on: macos-14
+
+    if: >-
+      ${{!(false
+      || contains(github.event.head_commit.message, '[DOC]')
+      || contains(github.event.pull_request.title, '[DOC]')
+      || contains(github.event.pull_request.labels.*.name, 'Documentation')
+      || (github.event_name == 'push' && github.event.pull_request.user.login == 'dependabot[bot]')
+      )}}
+
+    steps:
+      - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
+
+      - uses: ./.github/actions/setup/macos
+
+      - uses: ./.github/actions/setup/directories
+        with:
+          srcdir: src
+          builddir: build
+          makeup: true
+
+      - name: Run configure
+        run: ../src/configure -C --disable-install-doc --prefix="$(pwd)/install" ${{ matrix.configure }}
+
+      - run: make install
+
+      # setup/directories set MAKEFLAGS=-j4 for macOS, which randomly fails sqlite3.gem builds
+      - name: Unset MAKEFLAGS
+        run: echo "MAKEFLAGS=" >> "$GITHUB_ENV"
+
+      - name: Checkout ruby-bench
+        uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
+        with:
+          repository: ruby/ruby-bench
+          path: ruby-bench
+
+      # If you want to skip failing benchmark, consider using `--excludes`.
+      # e.g. `bench_opts: '--warmup=1 --bench=1 --excludes=railsbench,lobsters'`
+      - name: Run ruby-bench
+        run: ruby run_benchmarks.rb -e "zjit::../build/install/bin/ruby ${{ matrix.ruby_opts }}" ${{ matrix.bench_opts }}
+        working-directory: ruby-bench
+
+      - uses: ./.github/actions/slack
+        with:
+          label: ruby-bench ${{ matrix.bench_opts }} ${{ matrix.ruby_opts }}
+          SLACK_WEBHOOK_URL: ${{ secrets.SIMPLER_ALERTS_URL }} # ruby-lang slack: ruby/simpler-alerts-bot
+        if: ${{ failure() }}
+
+defaults:
+  run:
+    working-directory: build
diff --git a/.github/workflows/zjit-ubuntu.yml b/.github/workflows/zjit-ubuntu.yml
new file mode 100644
index 0000000000..28bfec963e
--- /dev/null
+++ b/.github/workflows/zjit-ubuntu.yml
@@ -0,0 +1,267 @@
+name: ZJIT Ubuntu
+on:
+  push:
+    branches:
+      - master
+    paths-ignore:
+      - 'doc/**'
+      - '**/man/*'
+      - '**.md'
+      - '**.rdoc'
+      - '**/.document'
+      - '.*.yml'
+  pull_request:
+    types:
+      - opened
+      - synchronize
+      - reopened
+    # Do not use paths-ignore for required status checks
+    # https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/collaborating-on-repositories-with-code-quality-features/troubleshooting-required-status-checks#handling-skipped-but-required-checks
+  merge_group:
+
+concurrency:
+  group: ${{ github.workflow }} / ${{ startsWith(github.event_name, 'pull') && github.ref_name || github.sha }}
+  cancel-in-progress: ${{ startsWith(github.event_name, 'pull') }}
+
+permissions:
+  contents: read
+
+jobs:
+  lint:
+    name: cargo clippy
+
+    runs-on: ubuntu-22.04
+
+    if: >-
+      ${{!(false
+      || contains(github.event.head_commit.message, '[DOC]')
+      || contains(github.event.pull_request.title, '[DOC]')
+      || contains(github.event.pull_request.labels.*.name, 'Documentation')
+      || (github.event_name == 'push' && github.event.pull_request.user.login == 'dependabot[bot]')
+      )}}
+
+    steps:
+      - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
+
+      - run: cargo clippy --all-targets --all-features
+        working-directory: zjit
+
+  make:
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - test_task: 'check'
+            run_opts: '--zjit-call-threshold=1'
+            specopts: '-T --zjit-call-threshold=1'
+            configure: '--enable-zjit=dev'
+
+          - test_task: 'check'
+            run_opts: '--zjit-disable-hir-opt --zjit-call-threshold=1'
+            specopts: '-T --zjit-disable-hir-opt -T --zjit-call-threshold=1'
+            configure: '--enable-zjit=dev'
+
+            # The optimizer benefits from at least 1 iteration of profiling. Also, many
+            # regression tests in bootstraptest/test_yjit.rb assume call-threshold=2.
+          - test_task: 'btest'
+            run_opts: '--zjit-call-threshold=2'
+            configure: '--enable-zjit=dev'
+
+          - test_task: 'zjit-check' # zjit-test + quick feedback of test_zjit.rb
+            configure: '--enable-yjit --enable-zjit=dev'
+            rust_version: '1.85.0'
+
+          - test_task: 'zjit-bindgen'
+            hint: 'To fix: use patch in logs'
+            # Build with YJIT+ZJIT for output that works in the most number of configurations
+            configure: '--enable-zjit=dev --enable-yjit --with-gcc=clang-16'
+            clang_path: '/usr/bin/clang-16'
+            runs-on: 'ubuntu-24.04' # for clang-16
+
+          - test_task: 'test-bundled-gems'
+            configure: '--enable-zjit=dev'
+            run_opts: '--zjit-call-threshold=1'
+
+    env:
+      GITPULLOPTIONS: --no-tags origin ${{ github.ref }}
+      RUN_OPTS: ${{ matrix.run_opts }}
+      YJIT_BENCH_OPTS: ${{ matrix.yjit_bench_opts }}
+      SPECOPTS: ${{ matrix.specopts }}
+      TESTOPTS: ${{ matrix.testopts }}
+      RUBY_DEBUG: ci
+      BUNDLE_JOBS: 8 # for yjit-bench
+      RUST_BACKTRACE: 1
+      ZJIT_RB_BUG: 1
+
+    runs-on: ${{ matrix.runs-on || 'ubuntu-22.04' }}
+
+    if: >-
+      ${{!(false
+      || contains(github.event.head_commit.message, '[DOC]')
+      || contains(github.event.pull_request.title, '[DOC]')
+      || contains(github.event.pull_request.labels.*.name, 'Documentation')
+      || (github.event_name == 'push' && github.event.pull_request.user.login == 'dependabot[bot]')
+      )}}
+
+    steps:
+      - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
+        with:
+          sparse-checkout-cone-mode: false
+          sparse-checkout: /.github
+
+      - uses: ./.github/actions/setup/ubuntu
+
+      - uses: ruby/setup-ruby@b90be12699fdfcbee4440c2bba85f6f460446bb0 # v1.279.0
+        with:
+          ruby-version: '3.1'
+          bundler: none
+
+      - uses: taiki-e/install-action@v2
+        with:
+          tool: nextest@0.9
+        if: ${{ matrix.test_task == 'zjit-check' }}
+
+      - uses: ./.github/actions/setup/directories
+        with:
+          srcdir: src
+          builddir: build
+          makeup: true
+          dummy-files: ${{ matrix.test_task == 'check' }}
+          # Set fetch-depth: 10 so that Launchable can receive commits information.
+          fetch-depth: 10
+
+      - name: Install Rust
+        if: ${{ matrix.rust_version }}
+        run: |
+          rustup install ${{ matrix.rust_version }} --profile minimal
+          rustup default ${{ matrix.rust_version }}
+
+      - name: Install rustfmt
+        if: ${{ matrix.test_task == 'zjit-bindgen' }}
+        run: rustup component add rustfmt
+
+      - name: Run configure
+        run: ../src/configure -C --disable-install-doc --prefix=$(pwd)/install ${{ matrix.configure }}
+
+      - run: make incs
+
+      - run: make prepare-gems
+        if: ${{ matrix.test_task == 'test-bundled-gems' }}
+
+      - run: make
+
+      - name: Verify that --zjit-dump-disasm works
+        run: |
+          ./miniruby --zjit-call-threshold=1 --zjit-dump-disasm -e0 | \
+          wc -l | \
+          ruby -ne 'raise "Disassembly seems broken in dev build (output has too few lines)" unless $_.to_i > 10'
+        if: ${{ contains(matrix.configure, 'jit=dev') }}
+
+      # Check that the binary was built with ZJIT
+      - name: Check ZJIT enabled
+        run: ./miniruby --zjit -v | grep "+ZJIT"
+        if: ${{ matrix.configure != '--disable-zjit' }}
+
+      - name: Set ENV for ZJIT
+        run: |
+          echo "RUBY_CRASH_REPORT=$(pwd)/rb_crash_%p.txt" >> $GITHUB_ENV
+
+      - name: make ${{ matrix.test_task }}
+        run: |
+          set -x
+          make -s ${{ matrix.test_task }} ${TESTS:+TESTS="$TESTS"} \
+            RUN_OPTS="$RUN_OPTS" MSPECOPT=--debug SPECOPTS="$SPECOPTS" \
+            TESTOPTS="$TESTOPTS" \
+            ZJIT_BINDGEN_DIFF_OPTS="$ZJIT_BINDGEN_DIFF_OPTS"
+        timeout-minutes: 90
+        env:
+          RUBY_TESTOPTS: '-q --tty=no'
+          EXCLUDES: '../src/test/.excludes-zjit'
+          TEST_BUNDLED_GEMS_ALLOW_FAILURES: ''
+          PRECHECK_BUNDLED_GEMS: 'no'
+          SYNTAX_SUGGEST_TIMEOUT: '5'
+          ZJIT_BINDGEN_DIFF_OPTS: '--exit-code'
+          CLANG_PATH: ${{ matrix.clang_path }}
+        continue-on-error: ${{ matrix.continue-on-test_task || false }}
+
+      - name: Dump crash logs
+        if: ${{ failure() }}
+        continue-on-error: true
+        run: |
+          tail --verbose --lines=+1 rb_crash_*.txt
+          exit 1
+
+      - uses: ./.github/actions/slack
+        with:
+          label: ${{ matrix.test_task }} ${{ matrix.configure }}
+          SLACK_WEBHOOK_URL: ${{ secrets.SIMPLER_ALERTS_URL }} # ruby-lang slack: ruby/simpler-alerts-bot
+        if: ${{ failure() }}
+
+  result:
+    if: ${{ always() }}
+    name: ${{ github.workflow }} result
+    runs-on: ubuntu-22.04
+    needs: [make]
+    steps:
+      - name: ${{ github.workflow }} jobs have failed
+        run: exit 1
+        working-directory:
+        if: ${{ contains(needs.*.result, 'failure') || contains(needs.*.result, 'cancelled') }}
+
+  # Separated from `make` job to avoid making it a required status check for now
+  ruby-bench:
+    strategy:
+      matrix:
+        include:
+          # Test --call-threshold=2 with 2 iterations in total
+          - ruby_opts: '--zjit-call-threshold=2'
+            bench_opts: '--warmup=1 --bench=1 --excludes=lobsters'
+            configure: '--enable-zjit=dev_nodebug' # --enable-zjit=dev is too slow
+
+    runs-on: ubuntu-24.04
+
+    if: >-
+      ${{!(false
+      || contains(github.event.head_commit.message, '[DOC]')
+      || contains(github.event.pull_request.title, '[DOC]')
+      || contains(github.event.pull_request.labels.*.name, 'Documentation')
+      || (github.event_name == 'push' && github.event.pull_request.user.login == 'dependabot[bot]')
+      )}}
+
+    steps:
+      - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
+
+      - uses: ./.github/actions/setup/ubuntu
+
+      - uses: ./.github/actions/setup/directories
+        with:
+          srcdir: src
+          builddir: build
+          makeup: true
+
+      - name: Run configure
+        run: ../src/configure -C --disable-install-doc --prefix="$(pwd)/install" ${{ matrix.configure }}
+
+      - run: make install
+
+      - name: Checkout ruby-bench
+        uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
+        with:
+          repository: ruby/ruby-bench
+          path: ruby-bench
+
+      # If you want to skip failing benchmark, consider using `--excludes`.
+      # e.g. `bench_opts: '--warmup=1 --bench=1 --excludes=railsbench,lobsters'`
+      - name: Run ruby-bench
+        run: ruby run_benchmarks.rb -e "zjit::../build/install/bin/ruby ${{ matrix.ruby_opts }}" ${{ matrix.bench_opts }}
+        working-directory: ruby-bench
+
+      - uses: ./.github/actions/slack
+        with:
+          label: ruby-bench ${{ matrix.bench_opts }} ${{ matrix.ruby_opts }}
+          SLACK_WEBHOOK_URL: ${{ secrets.SIMPLER_ALERTS_URL }} # ruby-lang slack: ruby/simpler-alerts-bot
+        if: ${{ failure() }}
+
+defaults:
+  run:
+    working-directory: build
diff --git a/.gitignore b/.gitignore
index 521f4ec807..6cf5fb5f32 100644
--- a/.gitignore
+++ b/.gitignore
@@ -14,17 +14,20 @@
 *.inc
 *.log
 *.o
+*.o.tmp
 *.obj
 *.old
 *.orig
 *.pch
 *.pdb
 *.rbinc
+*.rbbin
 *.rej
 *.s
 *.sav
 *.sl
 *.so
+*.so.*
 *.swp
 *.yarb
 *~
@@ -48,6 +51,7 @@ y.tab.c
 *.gcno
 *.gcov
 *.vscode
+!misc/.vscode
 lcov*.info
 
 # /
@@ -121,6 +125,7 @@ lcov*.info
 /repack
 /revision.h
 /revision.tmp
+/ripper.tmp.y
 /riscos
 /rubicon
 /ruby
@@ -134,17 +139,19 @@ lcov*.info
 /test.rb
 /test-coverage.dat
 /tmp
+/vcpkg_installed
 /transdb.h
 /uncommon.mk
 /verconf.h
 /verconf.mk
 /web
-/yasmdata.rb
 
 # /bin/
 
 /bin/*.exe
 /bin/*.dll
+/bin/goruby
+/bin/ruby
 
 # /benchmark/
 /benchmark/bm_require.data
@@ -160,6 +167,7 @@ lcov*.info
 
 # /coroutine/
 !/coroutine/**/*.s
+!/coroutine/**/*.S
 
 # /enc/trans/
 /enc/trans/*.c
@@ -199,8 +207,10 @@ lcov*.info
 
 # /ext/ripper/
 /ext/ripper/eventids1.c
+/ext/ripper/eventids1.h
 /ext/ripper/.eventids2-check
 /ext/ripper/eventids2table.c
+/ext/ripper/ripper_init.c
 /ext/ripper/ripper.*
 /ext/ripper/ids1
 /ext/ripper/ids2
@@ -219,7 +229,10 @@ lcov*.info
 /lib/ruby/[1-9]*.*
 /lib/ruby/vendor_ruby
 
-# /spec/bundler
+# /misc/
+/misc/**/__pycache__
+
+# for `make test-bundler`
 /.rspec_status
 
 # /tool/
@@ -229,10 +242,39 @@ lcov*.info
 # /win32/
 /win32/*.ico
 
-# MJIT
-/rb_mjit_header.h
-/mjit_config.h
-/include/ruby-*/*/rb_mjit_min_header-*.h
+
+# YJIT
+/yjit-bench
+/yjit_exit_locations.dump
+
+# Rust
+/target
 
 # /wasm/
 /wasm/tests/*.wasm
+
+# prism
+/lib/prism/compiler.rb
+/lib/prism/dispatcher.rb
+/lib/prism/dot_visitor.rb
+/lib/prism/dsl.rb
+/lib/prism/inspect_visitor.rb
+/lib/prism/mutation_compiler.rb
+/lib/prism/node.rb
+/lib/prism/reflection.rb
+/lib/prism/serialize.rb
+/lib/prism/visitor.rb
+/prism/api_node.c
+/prism/ast.h
+/prism/diagnostic.c
+/prism/diagnostic.h
+/prism/node.c
+/prism/prettyprint.c
+/prism/serialize.c
+/prism/token_type.c
+/prism/srcs.mk
+
+# tool/update-NEWS-gemlist.rb
+/bundled_gems.json
+/default_gems.json
+/gems/default_gems
diff --git a/.indent.pro b/.indent.pro
new file mode 100644
index 0000000000..1d61cbcad1
--- /dev/null
+++ b/.indent.pro
@@ -0,0 +1,32 @@
+-bap
+-nbbb
+-nbc
+-br
+-brs
+-nbs
+-ncdb
+-nce
+-cdw
+-cli2
+-cbi2
+-ndj
+-ncs
+-nfc1
+-i4
+-l120
+-lp
+-npcs
+-psl
+-sc
+-sob
+-sbi4
+-nut
+-par
+
+-TID
+-TVALUE
+-Tst_data_t
+-Tst_index_t
+-Tst_table
+-Trb_data_type_t
+-TFILE
diff --git a/.mailmap b/.mailmap
new file mode 100644
index 0000000000..213a0f4916
--- /dev/null
+++ b/.mailmap
@@ -0,0 +1,431 @@
+git[bot]                                <svn-admin@ruby-lang.org>
+git[bot]                                <svn-admin@ruby-lang.org> git <svn@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
+svn[bot]                                <svn-admin@ruby-lang.org> svn <svn@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
+
+# a_matsuda
+Akira Matsuda                           <ronnie@dio.jp>
+Akira Matsuda                           <ronnie@dio.jp> <a_matsuda@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
+
+# aamine
+Minero Aoki                             <aamine@loveruby.net>
+Minero Aoki                             <aamine@loveruby.net> <aamine@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
+
+# akira
+akira yamada                            <akira@ruby-lang.org>
+## akira yamada                         <akira@ruby-lang.org> <akira@rice.p.arika.org>
+akira yamada                            <akira@ruby-lang.org> <akira@arika.org>
+akira yamada                            <akira@ruby-lang.org> <akira@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
+
+# akiyoshi
+AKIYOSHI, Masamichi                     <masamichi.akiyoshi@hp.com>
+AKIYOSHI, Masamichi                     <masamichi.akiyoshi@hp.com> <akiyoshi@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
+
+# akr
+Tanaka Akira                            <akr@fsij.org>
+Tanaka Akira                            <akr@fsij.org> <akr@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
+
+# arai
+Koji Arai                               <jca02266@nifty.ne.jp>
+Koji Arai                               <jca02266@nifty.ne.jp> <arai@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
+
+# arton
+Akio Tajima                             <artonx@yahoo.co.jp>
+Akio Tajima                             <artonx@yahoo.co.jp> <arton@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
+
+# aycabta
+aycabta                                 <aycabta@gmail.com>
+aycabta                                 <aycabta@gmail.com> <aycabta@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
+
+# ayumin
+Ayumu AIZAWA                            <ayumu.aizawa@gmail.com>
+Ayumu AIZAWA                            <ayumu.aizawa@gmail.com> <ayumin@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
+
+# azav
+Alexander Zavorine                      <alexandre.zavorine@nokia.com>
+Alexander Zavorine                      <alexandre.zavorine@nokia.com> <azav@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
+
+# charliesome
+Charlie Somerville                      <charliesome@ruby-lang.org>
+Charlie Somerville                      <charliesome@ruby-lang.org> <charliesome@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
+
+# dave
+Dave Thomas                             <dave@pragprog.com>
+Dave Thomas                             <dave@pragprog.com> <dave@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
+
+# davidflanagan
+David Flanagan                          <davidflanagan@ruby-lang.org>
+David Flanagan                          <davidflanagan@ruby-lang.org> <david@think32>
+David Flanagan                          <davidflanagan@ruby-lang.org> <david@davidflanagan.com>
+David Flanagan                          <davidflanagan@ruby-lang.org> <davidflanagan@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
+
+# dblack
+David A. Black                          <dblack@rubypal.com>
+David A. Black                          <dblack@rubypal.com> <dblack@wobblini.net>
+David A. Black                          <dblack@rubypal.com> <dblack@superlink.net>
+David A. Black                          <dblack@rubypal.com> <dblack@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
+
+# drbrain
+Eric Hodel                              <drbrain@segment7.net>
+Eric Hodel                              <drbrain@segment7.net> <drbrain@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
+
+# duerst
+Martin Dürst                            <duerst@it.aoyama.ac.jp>
+Martin Dürst                            <duerst@it.aoyama.ac.jp> <duerst@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
+
+# eban
+WATANABE Hirofumi                       <eban@ruby-lang.org>
+WATANABE Hirofumi                       <eban@ruby-lang.org> <eban@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
+
+# emboss
+Martin Bosslet                          <Martin.Bosslet@gmail.com>
+Martin Bosslet                          <Martin.Bosslet@gmail.com> <Martin.Bosslet@googlemail.com>
+Martin Bosslet                          <Martin.Bosslet@gmail.com> <emboss@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
+
+# eregon
+Benoit Daloze                           <eregontp@gmail.com>
+Benoit Daloze                           <eregontp@gmail.com> <eregon@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
+
+# evan
+Evan Phoenix                            <evan@ruby-lang.org>
+Evan Phoenix                            <evan@ruby-lang.org> <evan@fallingsnow.net>
+Evan Phoenix                            <evan@ruby-lang.org> <evan@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
+
+# glass
+Masaki Matsushita                       <glass.saga@gmail.com>
+Masaki Matsushita                       <glass.saga@gmail.com> <glass@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
+
+# gogotanaka
+Kazuki Tanaka                           <gogotanaka@ruby-lang.org>
+Kazuki Tanaka                           <gogotanaka@ruby-lang.org> <gogotanaka@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
+
+# gotoken
+Kentaro Goto                            <gotoken@gmail.com>
+Kentaro Goto                            <gotoken@gmail.com> <gotoken@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
+
+# gotoyuzo
+GOTOU Yuuzou                            <gotoyuzo@notwork.org>
+GOTOU Yuuzou                            <gotoyuzo@notwork.org> <gotoyuzo@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
+
+# gsinclair
+Gavin Sinclair                          <gsinclair@soyabean.com.au>
+Gavin Sinclair                          <gsinclair@soyabean.com.au> <gsinclair@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
+
+# H_Konishi
+KONISHI Hiromasa                        <konishih@fd6.so-net.ne.jp>
+KONISHI Hiromasa                        <konishih@fd6.so-net.ne.jp> <H_Konishi@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
+
+# headius
+Charles Oliver Nutter                   <headius@headius.com>
+Charles Oliver Nutter                   <headius@headius.com> <headius@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
+
+# hone
+Terence Lee                             <hone@heroku.com>
+Terence Lee                             <hone@heroku.com> <hone@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
+
+# hsbt
+Hiroshi SHIBATA                         <hsbt@ruby-lang.org>
+Hiroshi SHIBATA                         <hsbt@ruby-lang.org> <hsbt@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
+
+# iwamatsu
+Nobuhiro Iwamatsu                       <iwamatsu@nigauri.org>
+Nobuhiro Iwamatsu                       <iwamatsu@nigauri.org> <iwamatsu@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
+
+# jeg2
+James Edward Gray II                    <james@graysoftinc.com>
+James Edward Gray II                    <james@graysoftinc.com> <jeg2@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
+
+# jim
+Jim Weirich                             <jim@tardis.local>
+Jim Weirich                             <jim@tardis.local> <jim@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
+
+# k0kubun
+Takashi Kokubun                         <takashikkbn@gmail.com>
+Takashi Kokubun                         <takashikkbn@gmail.com> <k0kubun@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
+
+# kanemoto
+Yutaka Kanemoto                         <kanemoto@ruby-lang.org>
+Yutaka Kanemoto                         <kanemoto@ruby-lang.org> <kanemoto@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
+
+# katsu
+UENO Katsuhiro                          <katsu@blue.sky.or.jp>
+UENO Katsuhiro                          <katsu@blue.sky.or.jp> <katsu@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
+
+# kazu
+Kazuhiro NISHIYAMA                      <zn@mbf.nifty.com>
+Kazuhiro NISHIYAMA                      <zn@mbf.nifty.com> <kazu@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
+
+# keiju
+Keiju Ishitsuka                         <keiju@ishitsuka.com>
+Keiju Ishitsuka                         <keiju@ishitsuka.com> <keiju@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
+
+# knu
+Akinori MUSHA                           <knu@iDaemons.org>
+Akinori MUSHA                           <knu@iDaemons.org> <knu@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
+
+# ko1
+Koichi Sasada                           <ko1@atdot.net>
+Koichi Sasada                           <ko1@atdot.net> <ko1@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
+
+# kosaki
+KOSAKI Motohiro                         <kosaki.motohiro@gmail.com>
+KOSAKI Motohiro                         <kosaki.motohiro@gmail.com> <kosaki@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
+
+# kosako
+K.Kosako                                <sndgk393@ybb.ne.jp>
+K.Kosako                                <sndgk393@ybb.ne.jp> <kosako@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
+
+# kou
+Sutou Kouhei                            <kou@clear-code.com>
+Sutou Kouhei                            <kou@clear-code.com> <kou@cozmixng.org>
+Sutou Kouhei                            <kou@clear-code.com> <kou@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
+
+# kouji
+Kouji Takao                             <kouji.takao@gmail.com>
+Kouji Takao                             <kouji.takao@gmail.com> <kouji@takao7.net>
+Kouji Takao                             <kouji.takao@gmail.com> <kouji@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
+
+# ksaito
+Kazuo Saito                             <ksaito@uranus.dti.ne.jp>
+Kazuo Saito                             <ksaito@uranus.dti.ne.jp> <ksaito@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
+
+# ktsj
+Kazuki Tsujimoto                        <kazuki@callcc.net>
+Kazuki Tsujimoto                        <kazuki@callcc.net> <ktsj@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
+
+# luislavena
+Luis Lavena                             <luislavena@gmail.com>
+Luis Lavena                             <luislavena@gmail.com> <luislavena@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
+
+# mame
+Yusuke Endoh                            <mame@ruby-lang.org>
+## Yusuke Endoh                         <mame@ruby-lang.org> <mame@tsg.ne.jp>
+Yusuke Endoh                            <mame@ruby-lang.org> <mame@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
+
+# marcandre
+Marc-Andre Lafortune                    <github@marc-andre.ca>
+Marc-Andre Lafortune                    <ruby-core@marc-andre.ca>
+Marc-Andre Lafortune                    <ruby-core@marc-andre.ca> <marcandre@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
+
+# matz
+Yukihiro "Matz" Matsumoto               <matz@ruby.or.jp>
+Yukihiro "Matz" Matsumoto               <matz@ruby.or.jp> <matz@ruby-lang.org>
+Yukihiro "Matz" Matsumoto               <matz@ruby.or.jp> <matz@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
+
+# michal
+Michal Rokos                            <michal@ruby-lang.org>
+Michal Rokos                            <michal@ruby-lang.org> <michal@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
+
+# mneumann
+Michael Neumann                         <mneumann@ruby-lang.org>
+Michael Neumann                         <mneumann@ruby-lang.org> <mneumann@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
+
+# mrkn
+Kenta Murata                            <mrkn@mrkn.jp>
+Kenta Murata                            <mrkn@mrkn.jp> <muraken@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
+Kenta Murata                            <mrkn@mrkn.jp> <3959+mrkn@users.noreply.github.com>
+Kenta Murata                            <mrkn@mrkn.jp> <mrkn@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
+
+# nagachika
+nagachika                               <nagachika@ruby-lang.org>
+nagachika                               <nagachika@ruby-lang.org> <nagachika@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
+
+# nagai
+Hidetoshi NAGAI                         <nagai@ai.kyutech.ac.jp>
+Hidetoshi NAGAI                         <nagai@ai.kyutech.ac.jp> <nagai@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
+
+# nahi
+Hiroshi Nakamura                        <nahi@ruby-lang.org>
+Hiroshi Nakamura                        <nahi@ruby-lang.org> <nahi@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
+
+# nari
+Narihiro Nakamura                       <authornari@gmail.com>
+Narihiro Nakamura                       <authornari@gmail.com> <nari@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
+
+# naruse
+NARUSE, Yui                             <naruse@airemix.jp>
+NARUSE, Yui                             <naruse@airemix.jp> <naruse@ruby-lang.org>
+NARUSE, Yui                             <naruse@airemix.jp> <naruse@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
+
+# ngoto
+Naohisa Goto                            <ngotogenome@gmail.com>
+Naohisa Goto                            <ngotogenome@gmail.com> <ngoto@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
+
+# nobu
+Nobuyoshi Nakada                        <nobu@ruby-lang.org>
+Nobuyoshi Nakada                        <nobu@ruby-lang.org> <nobu@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
+
+# normal
+Eric Wong                               <normal@ruby-lang.org>
+Eric Wong                               <normal@ruby-lang.org> <e@80x24.org>
+Eric Wong                               <normal@ruby-lang.org> <normal@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
+
+# ntalbott
+Nathaniel Talbott                       <ntalbott@ruby-lang.org>
+Nathaniel Talbott                       <ntalbott@ruby-lang.org> <ntalbott@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
+
+# ocean
+Hirokazu Yamamoto                       <ocean@m2.ccsnet.ne.jp>
+Hirokazu Yamamoto                       <ocean@m2.ccsnet.ne.jp> <ocean@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
+
+# odaira
+Rei Odaira                              <rodaira@us.ibm.com>
+Rei Odaira                              <rodaira@us.ibm.com> <Rei.Odaira@gmail.com>
+Rei Odaira                              <rodaira@us.ibm.com> <odaira@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
+
+# okkez
+okkez                                   <okkez000@gmail.com>
+okkez                                   <okkez000@gmail.com> <okkez@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
+
+# rhe
+Kazuki Yamaguchi                        <k@rhe.jp>
+Kazuki Yamaguchi                        <k@rhe.jp> <rhe@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
+
+# ryan
+Ryan Davis                              <ryand-github@zenspider.com>
+Ryan Davis                              <ryand-github@zenspider.com> <ryand-ruby@zenspider.com>
+Ryan Davis                              <ryand-github@zenspider.com> <ryan@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
+
+# samuel
+Samuel Williams                         <samuel.williams@oriontransfer.co.nz>
+Samuel Williams                         <samuel.williams@oriontransfer.co.nz> <samuel@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
+
+# seki
+Masatoshi SEKI                          <m_seki@mva.biglobe.ne.jp>
+Masatoshi SEKI                          <m_seki@mva.biglobe.ne.jp> <seki@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
+
+# ser
+Sean Russell                            <ser@germane-software.com>
+Sean Russell                            <ser@germane-software.com> <ser@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
+
+# shigek
+Shigeo Kobayashi                        <shigek@ruby-lang.org>
+Shigeo Kobayashi                        <shigek@ruby-lang.org> <shigek@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
+
+# shirosaki
+Hiroshi Shirosaki                       <h.shirosaki@gmail.com>
+Hiroshi Shirosaki                       <h.shirosaki@gmail.com> <shirosaki@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
+
+# sho-h
+Sho Hashimoto                           <sho-h@ruby-lang.org>
+Sho Hashimoto                           <sho-h@ruby-lang.org> <sho-h@netlab.jp>
+Sho Hashimoto                           <sho-h@ruby-lang.org> <sho.hsmt@gmail.com>
+Sho Hashimoto                           <sho-h@ruby-lang.org> <sho-h@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
+
+# shugo
+Shugo Maeda                             <shugo@ruby-lang.org>
+Shugo Maeda                             <shugo@ruby-lang.org> <shugo@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
+
+# shyouhei
+卜部昌平                                    <shyouhei@ruby-lang.org>
+卜部昌平                                    <shyouhei@ruby-lang.org> <shyouhei@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
+
+# siena
+Siena.                                  <siena@faculty.chiba-u.jp>
+Siena.                                  <siena@faculty.chiba-u.jp> <siena@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
+
+# sonots
+sonots                                  <sonots@gmail.com>
+sonots                                  <sonots@gmail.com> <sonots@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
+
+# sorah
+Sorah Fukumori                          <her@sorah.jp>
+Sorah Fukumori                          <her@sorah.jp> <sorah@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
+
+# stomar
+Marcus Stollsteimer                     <sto.mar@web.de>
+Marcus Stollsteimer                     <sto.mar@web.de> <stomar@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
+
+# suke
+Masaki Suketa                           <masaki.suketa@nifty.ne.jp>
+Masaki Suketa                           <masaki.suketa@nifty.ne.jp> <suke@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
+
+# tadd
+Tadashi Saito                           <tad.a.digger@gmail.com>
+Tadashi Saito                           <tad.a.digger@gmail.com> <tadd@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
+
+# tadf
+Tadayoshi Funaba                        <tadf@dotrb.org>
+Tadayoshi Funaba                        <tadf@dotrb.org> <tadf@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
+
+# takano32
+TAKANO Mitsuhiro                        <takano32@gmail.com>
+TAKANO Mitsuhiro                        <takano32@gmail.com> <takano32@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
+
+# tarui
+Masaya Tarui                            <tarui@ruby-lang.org>
+Masaya Tarui                            <tarui@ruby-lang.org> <tarui@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
+
+# technorama
+Technorama Ltd.                         <oss-ruby@technorama.net>
+Technorama Ltd.                         <oss-ruby@technorama.net> <technorama@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
+
+# tenderlove
+Aaron Patterson                         <tenderlove@ruby-lang.org>
+Aaron Patterson                         <tenderlove@ruby-lang.org> <tenderlove@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
+
+# tmm1
+Aman Gupta                              <ruby@tmm1.net>
+Aman Gupta                              <ruby@tmm1.net> <tmm1@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
+
+# ts
+Guy Decoux                              <ts@moulon.inra.fr>
+Guy Decoux                              <ts@moulon.inra.fr> <ts@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
+
+# ttate
+Takaaki Tateishi                        <ttate@ttsky.net>
+## Takaaki Tateishi                     <ttate@ttsky.net> <ttate@kt.jaist.ac.jp>
+Takaaki Tateishi                        <ttate@ttsky.net> <ttate@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
+
+# uema2
+Takaaki Uematsu                         <uema2x@jcom.home.ne.jp>
+Takaaki Uematsu                         <uema2x@jcom.home.ne.jp> <uema2@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
+
+# usa
+U.Nakamura                              <usa@ruby-lang.org>
+U.Nakamura                              <usa@ruby-lang.org> <usa@garbagecollect.jp>
+U.Nakamura                              <usa@ruby-lang.org> <usa@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
+
+# wakou
+Wakou Aoyama                            <wakou@ruby-lang.org>
+Wakou Aoyama                            <wakou@ruby-lang.org> <wakou@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
+
+# wanabe
+wanabe                                  <s.wanabe@gmail.com>
+wanabe                                  <s.wanabe@gmail.com> <wanabe@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
+
+# watson1978
+Watson                                  <watson1978@gmail.com>
+Watson                                  <watson1978@gmail.com> <watson1978@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
+
+# wew
+William Webber                          <william@williamwebber.com>
+William Webber                          <william@williamwebber.com> <wew@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
+
+# why
+why the lucky stiff                     <why@ruby-lang.org>
+why the lucky stiff                     <why@ruby-lang.org> <why@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
+
+# xibbar
+Takeyuki FUJIOKA                        <xibbar@ruby-lang.org>
+Takeyuki FUJIOKA                        <xibbar@ruby-lang.org> <xibbar@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
+
+# yugui
+Yuki Yugui Sonoda                       <yugui@yugui.jp>
+Yuki Yugui Sonoda                       <yugui@yugui.jp> <yugui@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
+
+# yui-knk
+yui-knk                                 <spiketeika@gmail.com>
+yui-knk                                 <spiketeika@gmail.com> <yui-knk@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
+
+# yuki
+Yuki Nishijima                          <yuki24@hey.com>
+Yuki Nishijima                          <yuki24@hey.com> <mail@yukinishijima.net>
+Yuki Nishijima                          <yuki24@hey.com> <yuki@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
+
+# zsombor
+Dee Zsombor                             <zsombor@ruby-lang.org>
+Dee Zsombor                             <zsombor@ruby-lang.org> <zsombor@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
+
+# zzak
+zzak                                    <zzakscott@gmail.com>
+zzak                                    <zzakscott@gmail.com> <zzak@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
diff --git a/.rdoc_options b/.rdoc_options
index 760507c7a2..89265cafd4 100644
--- a/.rdoc_options
+++ b/.rdoc_options
@@ -1,4 +1,39 @@
 ---
 page_dir: doc
-main_page: README.md
+charset: UTF-8
+encoding: UTF-8
+main_page: index.md
 title: Documentation for Ruby development version
+visibility: :private
+rdoc_include:
+- doc
+
+exclude:
+- \.gemspec\z
+- lib/set/subclass_compatible.rb
+
+autolink_excluded_words:
+- Box
+- Class
+- Method
+- Module
+- Process
+- RDoc
+- Ruby
+- Set
+- ZJIT
+- YJIT
+
+canonical_root: https://docs.ruby-lang.org/en/master
+
+footer_content:
+  Ruby:
+    Documentation: index.html
+    Official Website: https://www.ruby-lang.org/
+    Playground: https://ruby.github.io/play-ruby/
+  Resources:
+    GitHub: https://github.com/ruby/ruby
+    Issue Tracker: https://bugs.ruby-lang.org/projects/ruby-master/issues
+    RubyGems: https://rubygems.org/
+  Community:
+    X: https://x.com/rubylangorg
diff --git a/.travis.yml b/.travis.yml
deleted file mode 100644
index a34d3692af..0000000000
--- a/.travis.yml
+++ /dev/null
@@ -1,234 +0,0 @@
-# -*- YAML -*-
-# Copyright (C) 2011 Urabe, Shyouhei.  All rights reserved.
-#
-# This file is  a part of the programming language  Ruby.  Permission is hereby
-# granted,  to either  redistribute  or  modify this  file,  provided that  the
-# conditions  mentioned in  the file  COPYING are  met.  Consult  the  file for
-# details.
-
-# We only manage non-amd64 free pipelines.
-# https://docs.travis-ci.com/user/billing-overview/
-
-language: c
-
-os: linux
-
-if: commit_message !~ /^\[DOC\]/
-
-dist: focal
-
-git:
-  quiet: true
-
-cache:
-  ccache: true
-  directories:
-    - $HOME/config_2nd
-    - $HOME/.downloaded-cache
-
-env:
-  global:
-    # The tests skipped in `make test-all`.
-    - TEST_ALL_SKIPPED_TESTS=
-    # The tests executed separately by `make test-all`.
-    - TEST_ALL_SEPARATED_TESTS=
-    # Reset timestamps early
-    - _=$(touch NEWS && find . -type f -exec touch -r NEWS {} +)
-    - CONFIGURE_TTY=no
-    - CCACHE_COMPILERCHECK=none
-    - CCACHE_NOCOMPRESS=1
-    - CCACHE_MAXSIZE=512Mi
-    - NPROC="`nproc`"
-    # JOBS and SETARCH are overridden when necessary; see below.
-    - JOBS=-j$((1+${NPROC}))
-    - SETARCH=
-    - RUBY_PREFIX=/tmp/ruby-prefix
-    - GEMS_FOR_TEST='timezone tzinfo'
-    # https://github.com/travis-ci/travis-build/blob/e411371dda21430a60f61b8f3f57943d2fe4d344/lib/travis/build/bash/travis_apt_get_options.bash#L7
-    - travis_apt_get_options='--allow-downgrades --allow-remove-essential --allow-change-held-packages'
-    - travis_apt_get_options="-yq --no-install-suggests --no-install-recommends $travis_apt_get_options"
-    # -O1 is faster than -O3 in our tests.
-    - optflags=-O1
-    # -g0 disables backtraces when SEGV.  Do not set that.
-    - debugflags=-ggdb3
-
-.org.ruby-lang.ci.matrix-definitions:
-
-  - &gcc-10
-    compiler: gcc-10
-    before_install:
-      - tool/travis_retry.sh sudo bash -c "rm -rf '${TRAVIS_ROOT}/var/lib/apt/lists/'* && exec apt-get update -yq"
-      - >-
-        tool/travis_retry.sh sudo -E apt-get $travis_apt_get_options install
-        ccache
-        gcc-10
-        g++-10
-        libffi-dev
-        libncurses-dev
-        libncursesw5-dev
-        libreadline-dev
-        libssl-dev
-        libyaml-dev
-        openssl
-        zlib1g-dev
-
-  # --------
-
-  - &arm64-linux
-    name: arm64-linux
-    arch: arm64
-    <<: *gcc-10
-
-  - &ppc64le-linux
-    name: ppc64le-linux
-    arch: ppc64le
-    <<: *gcc-10
-
-  - &s390x-linux
-    name: s390x-linux
-    arch: s390x
-    <<: *gcc-10
-
-  - &arm32-linux
-    name: arm32-linux
-    arch: arm64
-    # https://packages.ubuntu.com/focal/crossbuild-essential-armhf
-    compiler: arm-linux-gnueabihf-gcc
-    env:
-      - SETARCH='setarch linux32 --verbose --32bit'
-      # The "TestReadline#test_interrupt_in_other_thread" started failing on arm32
-      # from https://www.travis-ci.com/github/ruby/ruby/jobs/529005145
-      - TEST_ALL_SKIPPED_TESTS=test_interrupt_in_other_thread
-    before_install:
-      - sudo dpkg --add-architecture armhf
-      - tool/travis_retry.sh sudo bash -c "rm -rf '${TRAVIS_ROOT}/var/lib/apt/lists/'* && exec apt-get update -yq"
-      - >-
-        tool/travis_retry.sh sudo -E apt-get $travis_apt_get_options install
-        ccache
-        crossbuild-essential-armhf
-        libc6:armhf
-        libstdc++-10-dev:armhf
-        libffi-dev:armhf
-        libncurses-dev:armhf
-        libncursesw5-dev:armhf
-        libreadline-dev:armhf
-        libssl-dev:armhf
-        linux-libc-dev:armhf
-        zlib1g-dev:armhf
-
-matrix:
-  include:
-    # Build every commit (Allowed Failures):
-    - <<: *arm32-linux
-    # Comment out as the 2nd arm64 pipeline is unstable.
-    # - <<: *arm64-linux
-    - <<: *ppc64le-linux
-    - <<: *s390x-linux
-  allow_failures:
-    # We see multiple errors indicating errors on the Travis environment itself in a short while:
-    # https://app.travis-ci.com/github/ruby/ruby/jobs/544382885
-    # https://app.travis-ci.com/github/ruby/ruby/jobs/544361370
-    # It's not a fault of Ruby's arm32 support but just Travis arm32 seems unsable.
-    - name: arm32-linux
-    # - name: arm64-linux
-    # We see "Some worker was crashed." in about 40% of recent ppc64le-linux jobs
-    # e.g. https://app.travis-ci.com/github/ruby/ruby/jobs/530959548
-    - name: ppc64le-linux
-    # Tentatively disable, because often hungs up **after** all tests
-    # have finished successfully and saving caches.
-    - name: s390x-linux
-  fast_finish: true
-
-before_script:
-  - . tool/ci_functions.sh
-  - |-
-    if [ -n "${TEST_ALL_SKIPPED_TESTS}" ]; then
-      TEST_ALL_OPTS="${TEST_ALL_OPTS} $(ci_to_excluded_test_opts "${TEST_ALL_SKIPPED_TESTS}")"
-      if [ -z "${TEST_ALL_SEPARATED_TESTS}" ]; then
-        TEST_ALL_SEPARATED_TESTS="${TEST_ALL_SKIPPED_TESTS}"
-      fi
-    fi
-  - |-
-    if [ -n "${TEST_ALL_SEPARATED_TESTS}" ]; then
-      TEST_ALL_OPTS_SEPARATED="$(ci_to_included_test_opts "${TEST_ALL_SEPARATED_TESTS}")"
-    fi
-  - echo TEST_ALL_OPTS="${TEST_ALL_OPTS}" TEST_ALL_OPTS_SEPARATED="${TEST_ALL_OPTS_SEPARATED}"
-  - rm -fr .ext autom4te.cache
-  - |-
-    [ -d ~/.downloaded-cache ] ||
-    mkdir ~/.downloaded-cache
-  - ln -s ~/.downloaded-cache
-  - "> config.status"
-  - "> .rbconfig.time"
-  - sed -f tool/prereq.status template/Makefile.in common.mk > Makefile
-  - make -s $JOBS up
-  - make -s $JOBS srcs
-  - rm -f config.status Makefile rbconfig.rb .rbconfig.time
-  - |-
-    if [ -d ~/config_2nd ]; then
-      cp -pr ~/config_2nd build
-    else
-      mkdir build
-    fi
-  - mkdir config_1st config_2nd
-  - chmod -R a-w .
-  - chmod -R u+w build config_1st config_2nd
-  - cd build
-  - |-
-    case "$CC" in
-    gcc*)   CC="ccache $CC${GCC_FLAGS:+ }$GCC_FLAGS -fno-diagnostics-color";;
-    clang*) CC="ccache $CC${GCC_FLAGS:+ }$GCC_FLAGS -fno-color-diagnostics";;
-    esac
-  - |-
-    [ ! -f config.cache ] ||
-    [ "$CC" = "`sed -n s/^ac_cv_prog_CC=//p config.cache`" ] ||
-    (set -x; exec rm config.cache)
-  - $SETARCH ../configure -C --disable-install-doc --prefix=$RUBY_PREFIX $CONFIG_FLAG
-  - cp -pr config.cache config.status .ext/include ../config_1st
-  - $SETARCH make reconfig
-  - cp -pr config.cache config.status .ext/include ../config_2nd
-  - (cd .. && exec diff -ru config_1st config_2nd)
-  - chmod u+w ..
-  - rm -rf ~/config_2nd
-  - mv ../config_2nd ~
-  - chmod u-w ..
-  - $SETARCH make -s $JOBS
-  - make -s install
-  - |-
-    [ -z "${GEMS_FOR_TEST}" ] ||
-    $RUBY_PREFIX/bin/gem install --no-document $GEMS_FOR_TEST
-  - echo "raise 'do not load ~/.irbrc in test'" > ~/.irbrc
-
-script:
-  - $SETARCH make -s test -o showflags TESTOPTS="${TESTOPTS=$JOBS -q --tty=no}"
-  - ../tool/travis_wait.sh $SETARCH make -s test-all -o exts TESTOPTS="$JOBS -q --tty=no ${TEST_ALL_OPTS}" RUBYOPT="-w"
-  # Run the failing tests separately returning ok status to check if it works,
-  # visualize them.
-  - |
-    if [ -n "${TEST_ALL_OPTS_SEPARATED}" ]; then
-      $SETARCH make -s test-all -o exts TESTOPTS="$JOBS -v --tty=no ${TEST_ALL_OPTS_SEPARATED}" RUBYOPT="-w" || :
-    fi
-  - $SETARCH make -s test-spec MSPECOPT=-ff # not using `-j` because sometimes `mspec -j` silently dies
-  - $SETARCH make -s -o showflags leaked-globals
-
-# We enable Travis on the specific branches or forked repositories here.
-if: (repo = ruby/ruby AND (branch = master OR branch =~ /^ruby_\d_\d$/)) OR repo != ruby/ruby
-
-# We want to be notified when something happens.
-notifications:
-  irc:
-    channels:
-      - "chat.freenode.net#ruby-core"
-    on_success: change # [always|never|change] # default: always
-    on_failure: always # [always|never|change] # default: always
-    template:
-      - "%{message} by @%{author}: See %{build_url}"
-
-  webhooks:
-    urls:
-      - secure: mRsoS/UbqDkKkW5p3AEqM27d4SZnV6Gsylo3bm8T/deltQzTsGzZwrm7OIBXZv0UFZdE68XmPlyHfZFLSP2V9QZ7apXMf9/vw0GtcSe1gchtnjpAPF6lYBn7nMCbVPPx9cS0dwL927fjdRM1vj7IKZ2bk4F0lAJ25R25S6teqdk= # ruby-lang slack: ruby/simpler-alerts-bot (travis)
-    on_success: never
-    on_failure: always
-
-  email:
-    - jaruga@ruby-lang.org
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 13df6087ca..35e79dd3b9 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -1 +1 @@
-See ["Contributing to Ruby"](https://docs.ruby-lang.org/en/master/contributing_md.html), which includes setup and build instructions.
+See ["Contributing to Ruby"](https://docs.ruby-lang.org/en/master/contributing/contributing_md.html), which includes setup and build instructions.
diff --git a/COPYING b/COPYING
index 48e5a96de7..428ce03ed7 100644
--- a/COPYING
+++ b/COPYING
@@ -1,3 +1,5 @@
+{日本語}[rdoc-ref:COPYING.ja]
+
 Ruby is copyrighted free software by Yukihiro Matsumoto <matz@netlab.jp>.
 You can redistribute it and/or modify it under either the terms of the
 2-clause BSDL (see the file BSDL), or the conditions below:
diff --git a/COPYING.ja b/COPYING.ja
index 230376bc60..5de2dbcc8f 100644
--- a/COPYING.ja
+++ b/COPYING.ja
@@ -1,3 +1,5 @@
+{English}[rdoc-ref:COPYING]
+
 本プログラムはフリーソフトウェアです．2-clause BSDL
 または以下に示す条件で本プログラムを再配布できます
 2-clause BSDLについてはBSDLファイルを参照して下さい．
diff --git a/Cargo.lock b/Cargo.lock
new file mode 100644
index 0000000000..9a4b2ebbba
--- /dev/null
+++ b/Cargo.lock
@@ -0,0 +1,193 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "capstone"
+version = "0.13.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "015ef5d5ca1743e3f94af9509ba6bd2886523cfee46e48d15c2ef5216fd4ac9a"
+dependencies = [
+ "capstone-sys",
+ "libc",
+]
+
+[[package]]
+name = "capstone-sys"
+version = "0.17.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2267cb8d16a1e4197863ec4284ffd1aec26fe7e57c58af46b02590a0235809a0"
+dependencies = [
+ "cc",
+ "libc",
+]
+
+[[package]]
+name = "cc"
+version = "1.2.18"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "525046617d8376e3db1deffb079e91cef90a89fc3ca5c185bbf8c9ecdd15cd5c"
+dependencies = [
+ "shlex",
+]
+
+[[package]]
+name = "console"
+version = "0.15.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0e1f83fc076bd6dd27517eacdf25fef6c4dfe5f1d7448bafaaf3a26f13b5e4eb"
+dependencies = [
+ "encode_unicode",
+ "lazy_static",
+ "libc",
+ "windows-sys",
+]
+
+[[package]]
+name = "encode_unicode"
+version = "0.3.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a357d28ed41a50f9c765dbfe56cbc04a64e53e5fc58ba79fbc34c10ef3df831f"
+
+[[package]]
+name = "insta"
+version = "1.43.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "154934ea70c58054b556dd430b99a98c2a7ff5309ac9891597e339b5c28f4371"
+dependencies = [
+ "console",
+ "once_cell",
+ "similar",
+]
+
+[[package]]
+name = "jit"
+version = "0.1.0"
+
+[[package]]
+name = "lazy_static"
+version = "1.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bbd2bcb4c963f2ddae06a2efc7e9f3591312473c50c6685e1f298068316e66fe"
+
+[[package]]
+name = "libc"
+version = "0.2.171"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c19937216e9d3aa9956d9bb8dfc0b0c8beb6058fc4f7a4dc4d850edf86a237d6"
+
+[[package]]
+name = "once_cell"
+version = "1.21.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "42f5e15c9953c5e4ccceeb2e7382a716482c34515315f7b03532b8b4e8393d2d"
+
+[[package]]
+name = "ruby"
+version = "0.0.0"
+dependencies = [
+ "yjit",
+ "zjit",
+]
+
+[[package]]
+name = "shlex"
+version = "1.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0fda2ff0d084019ba4d7c6f371c95d8fd75ce3524c3cb8fb653a3023f6323e64"
+
+[[package]]
+name = "similar"
+version = "2.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "32fea41aca09ee824cc9724996433064c89f7777e60762749a4170a14abbfa21"
+
+[[package]]
+name = "windows-sys"
+version = "0.52.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "282be5f36a8ce781fad8c8ae18fa3f9beff57ec1b52cb3de0789201425d9a33d"
+dependencies = [
+ "windows-targets",
+]
+
+[[package]]
+name = "windows-targets"
+version = "0.52.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9b724f72796e036ab90c1021d4780d4d3d648aca59e491e6b98e725b84e99973"
+dependencies = [
+ "windows_aarch64_gnullvm",
+ "windows_aarch64_msvc",
+ "windows_i686_gnu",
+ "windows_i686_gnullvm",
+ "windows_i686_msvc",
+ "windows_x86_64_gnu",
+ "windows_x86_64_gnullvm",
+ "windows_x86_64_msvc",
+]
+
+[[package]]
+name = "windows_aarch64_gnullvm"
+version = "0.52.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "32a4622180e7a0ec044bb555404c800bc9fd9ec262ec147edd5989ccd0c02cd3"
+
+[[package]]
+name = "windows_aarch64_msvc"
+version = "0.52.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "09ec2a7bb152e2252b53fa7803150007879548bc709c039df7627cabbd05d469"
+
+[[package]]
+name = "windows_i686_gnu"
+version = "0.52.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8e9b5ad5ab802e97eb8e295ac6720e509ee4c243f69d781394014ebfe8bbfa0b"
+
+[[package]]
+name = "windows_i686_gnullvm"
+version = "0.52.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0eee52d38c090b3caa76c563b86c3a4bd71ef1a819287c19d586d7334ae8ed66"
+
+[[package]]
+name = "windows_i686_msvc"
+version = "0.52.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "240948bc05c5e7c6dabba28bf89d89ffce3e303022809e73deaefe4f6ec56c66"
+
+[[package]]
+name = "windows_x86_64_gnu"
+version = "0.52.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "147a5c80aabfbf0c7d901cb5895d1de30ef2907eb21fbbab29ca94c5b08b1a78"
+
+[[package]]
+name = "windows_x86_64_gnullvm"
+version = "0.52.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "24d5b23dc417412679681396f2b49f3de8c1473deb516bd34410872eff51ed0d"
+
+[[package]]
+name = "windows_x86_64_msvc"
+version = "0.52.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "589f6da84c646204747d1270a2a5661ea66ed1cced2631d546fdfb155959f9ec"
+
+[[package]]
+name = "yjit"
+version = "0.1.0"
+dependencies = [
+ "capstone",
+ "jit",
+]
+
+[[package]]
+name = "zjit"
+version = "0.0.1"
+dependencies = [
+ "capstone",
+ "insta",
+ "jit",
+]
diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000000..521129d92d
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,60 @@
+# This is the root Cargo [workspace](https://doc.rust-lang.org/cargo/reference/workspaces.html)
+# and the root package for all the rust code that are statically linked into ruby. Rust tooling
+# limitations means all Rust code need to share a single archive library (staticlib) at the
+# integration point with non-rust code. (See rustlang/rust#44322 and #104707 for a taste of
+# the linking challenges.)
+#
+# Do not add required dependencies. This is a policy that helps downstream consumers and give
+# us tight control over what we ship. All of the optional dependencies are used exclusively
+# during development.
+#
+# Release builds avoid Cargo entirely because offline builds can fail even when none of the
+# optional dependencies are built (rust-lang/cargo#10352).
+
+[workspace]
+members = ["zjit", "yjit", "jit"]
+
+[package]
+name = "ruby"
+version = "0.0.0"
+edition = "2024"
+rust-version = "1.85.0"
+publish = false # Don't publish to crates.io
+
+[dependencies]
+yjit = { path = "yjit", optional = true }
+zjit = { path = "zjit", optional = true }
+
+[lib]
+crate-type = ["staticlib"]
+path = "ruby.rs"
+
+[features]
+disasm = ["yjit?/disasm", "zjit?/disasm"]
+runtime_checks = ["yjit?/runtime_checks", "zjit?/runtime_checks"]
+yjit = [ "dep:yjit" ]
+zjit = [ "dep:zjit" ]
+
+[profile.dev]
+opt-level = 0
+debug = true
+debug-assertions = true
+overflow-checks = true
+
+[profile.dev_nodebug]
+inherits = "dev"
+
+[profile.stats]
+inherits = "release"
+
+[profile.release]
+# NOTE: --enable-yjit and zjit builds use `rustc` without going through Cargo. You
+# might want to update the `rustc` invocation if you change this profile.
+opt-level = 3
+# The extra robustness that comes from checking for arithmetic overflow is
+# worth the performance cost for the compiler.
+overflow-checks = true
+# Generate debug info
+debug = true
+# Use ThinLTO. Much smaller output for a small amount of build time increase.
+lto = "thin"
diff --git a/LEGAL b/LEGAL
index 9645728efe..2777aa2c14 100644
--- a/LEGAL
+++ b/LEGAL
@@ -58,12 +58,12 @@ mentioned below.
 
 [ccan/list/list.h]
 
-  This file is licensed under the {MIT License}[rdoc-label:label-MIT+License].
+  This file is licensed under the {MIT License}[rdoc-ref:@MIT+License].
 
 [coroutine]
 
   Unless otherwise specified, these files are licensed under the
-  {MIT License}[rdoc-label:label-MIT+License].
+  {MIT License}[rdoc-ref:@MIT+License].
 
 [include/ruby/onigmo.h]
 [include/ruby/oniguruma.h]
@@ -546,7 +546,7 @@ mentioned below.
 
 [vsnprintf.c]
 
-  This file is under the {old-style BSD license}[rdoc-label:label-Old-style+BSD+license].
+  This file is under the {old-style BSD license}[rdoc-ref:@Old-style+BSD+license].
 
   >>>
     Copyright (c) 1990, 1993::
@@ -577,7 +577,7 @@ mentioned below.
 
 [missing/crypt.c]
 
-  This file is under the {old-style BSD license}[rdoc-label:label-Old-style+BSD+license].
+  This file is under the {old-style BSD license}[rdoc-ref:@Old-style+BSD+license].
 
   >>>
     Copyright (c) 1989, 1993::
@@ -588,7 +588,7 @@ mentioned below.
 
 [missing/setproctitle.c]
 
-  This file is under the {old-style BSD license}[rdoc-label:label-Old-style+BSD+license].
+  This file is under the {old-style BSD license}[rdoc-ref:@Old-style+BSD+license].
 
   >>>
     Copyright 2003:: Damien Miller
@@ -702,54 +702,27 @@ mentioned below.
     OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     SUCH DAMAGE.
 
-[ext/json/generator/generator.c]
+[ext/json/vendor/fpconv.c]
 
-  The file contains the following copyright notice.
+  This file is under the {Boost Software License}[rdoc-ref:@Boost+Software+License+1.0].
 
-  >>>
-    Copyright 2001-2004:: Unicode, Inc.
-
-    Disclaimer::
-
-      This source code is provided as is by Unicode, Inc. No claims are
-      made as to fitness for any particular purpose. No warranties of any
-      kind are expressed or implied. The recipient agrees to determine
-      applicability of information provided. If this file has been
-      purchased on magnetic or optical media from Unicode, Inc., the
-      sole remedy for any claim will be exchange of defective media
-      within 90 days of receipt.
-
-    Limitations on Rights to Redistribute This Code::
-
-      Unicode, Inc. hereby grants the right to freely use the information
-      supplied in this file in the creation of products supporting the
-      Unicode Standard, and to make copies of this file in any form
-      for internal or external distribution as long as this notice
-      remains attached.
-
-[ext/nkf/nkf-utf8/config.h]
-[ext/nkf/nkf-utf8/nkf.c]
-[ext/nkf/nkf-utf8/utf8tbl.c]
-
-  These files are under the following license.  So to speak, it is
-  copyrighted semi-public-domain software.
+[ext/json/vendor/jeaiii-ltoa.h]
 
   >>>
-    Copyright (C) 1987:: Fujitsu LTD. (Itaru ICHIKAWA)
+    Copyright (c) 2024,2025 Enrico Thierbach - https://github.com/radiospiel
+    Copyright (c) 2022 James Edward Anhalt III - https://github.com/jeaiii/itoa
+
+    {MIT License}[rdoc-ref:@MIT+License]
 
-    Everyone is permitted to do anything on this program
-    including copying, modifying, improving,
-    as long as you don't try to pretend that you wrote it.
-    i.e., the above copyright notice has to appear in all copies.
-    Binary distribution requires original version messages.
-    You don't have to ask before copying, redistribution or publishing.
-    THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE.
+[ext/json/vendor/ryu.h]
+  This file is adapted from the Ryu algorithm by Ulf Adams https://github.com/ulfjack/ryu.
+  It is dual-licensed under {Apache License 2.0}[rdoc-ref:@Apache+License+2.0] OR
+  {Boost Software License 1.0}[rdoc-ref:@Boost+Software+License+1.0].
 
 [ext/psych]
 [test/psych]
 
-  The files under these directories are under the following license, except for
-  ext/psych/yaml.
+  The files under these directories are under the following license.
 
   >>>
     Copyright 2009:: Aaron Patterson, et al.
@@ -772,31 +745,6 @@ mentioned below.
     OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
     SOFTWARE.
 
-[ext/psych/yaml]
-
-  The files under this directory are under the following license.
-
-  >>>
-    Copyright (c) 2006:: Kirill Simonov
-
-    Permission is hereby granted, free of charge, to any person obtaining a copy of
-    this software and associated documentation files (the "Software"), to deal in
-    the Software without restriction, including without limitation the rights to
-    use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
-    of the Software, and to permit persons to whom the Software is furnished to do
-    so, subject to the following conditions:
-
-    The above copyright notice and this permission notice shall be included in all
-    copies or substantial portions of the Software.
-
-    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-    IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-    AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-    LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-    OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
-    SOFTWARE.
-
 [ext/pty/pty.c]
 
   >>>
@@ -905,7 +853,7 @@ mentioned below.
   >>>
     RubyGems is copyrighted free software by Chad Fowler, Rich Kilmer, Jim
     Weirich and others.  You can redistribute it and/or modify it under
-    either the terms of the {MIT license}[rdoc-label:label-MIT+License], or the conditions
+    either the terms of the {MIT license}[rdoc-ref:@MIT+License], or the conditions
     below:
 
     1. You may make and give away verbatim copies of the source form of the
@@ -967,7 +915,7 @@ mentioned below.
     Portions copyright (c) 2010:: Andre Arko
     Portions copyright (c) 2009:: Engine Yard
 
-    {MIT License}[rdoc-label:label-MIT+License]
+    {MIT License}[rdoc-ref:@MIT+License]
 
 [lib/bundler/vendor/thor]
 
@@ -976,17 +924,25 @@ mentioned below.
   >>>
     Copyright (c) 2008 Yehuda Katz, Eric Hodel, et al.
 
-    {MIT License}[rdoc-label:label-MIT+License]
+    {MIT License}[rdoc-ref:@MIT+License]
 
-[lib/rubygems/resolver/molinillo]
-[lib/bundler/vendor/molinillo]
+[lib/rubygems/vendor/molinillo]
 
   molinillo is under the following license.
 
   >>>
     Copyright (c) 2014 Samuel E. Giddins segiddins@segiddins.me
 
-    {MIT License}[rdoc-label:label-MIT+License]
+    {MIT License}[rdoc-ref:@MIT+License]
+
+[lib/bundler/vendor/pub_grub]
+
+  pub_grub is under the following license.
+
+  >>>
+    Copyright (c) 2018 John Hawthorn
+
+    {MIT License}[rdoc-ref:@MIT+License]
 
 [lib/bundler/vendor/connection_pool]
 
@@ -995,7 +951,7 @@ mentioned below.
   >>>
     Copyright (c) 2011 Mike Perham
 
-    {MIT License}[rdoc-label:label-MIT+License]
+    {MIT License}[rdoc-ref:@MIT+License]
 
 [lib/bundler/vendor/net-http-persistent]
 
@@ -1004,7 +960,7 @@ mentioned below.
   >>>
     Copyright (c) Eric Hodel, Aaron Patterson
 
-    {MIT License}[rdoc-label:label-MIT+License]
+    {MIT License}[rdoc-ref:@MIT+License]
 
 [lib/did_you_mean]
 [lib/did_you_mean.rb]
@@ -1015,7 +971,7 @@ mentioned below.
   >>>
     Copyright (c) 2014-2016 Yuki Nishijima
 
-    {MIT License}[rdoc-label:label-MIT+License]
+    {MIT License}[rdoc-ref:@MIT+License]
 
 [lib/error_highlight]
 [lib/error_highlight.rb]
@@ -1026,7 +982,7 @@ mentioned below.
   >>>
     Copyright (c) 2021 Yusuke Endoh
 
-    {MIT License}[rdoc-label:label-MIT+License]
+    {MIT License}[rdoc-ref:@MIT+License]
 
 [benchmark/so_ackermann.rb]
 [benchmark/so_array.rb]
@@ -1109,3 +1065,236 @@ mentioned below.
 
       From ftp://ftp.cs.berkeley.edu/pub/4bsd/README.Impt.License.Change
       paragraph 3 above is now null and void.
+
+== Boost Software License 1.0
+
+>>>
+      Boost Software License - Version 1.0 - August 17th, 2003
+
+      Permission is hereby granted, free of charge, to any person or organization
+      obtaining a copy of the software and accompanying documentation covered by
+      this license (the "Software") to use, reproduce, display, distribute,
+      execute, and transmit the Software, and to prepare derivative works of the
+      Software, and to permit third-parties to whom the Software is furnished to
+      do so, all subject to the following:
+
+      The copyright notices in the Software and this entire statement, including
+      the above license grant, this restriction and the following disclaimer,
+      must be included in all copies of the Software, in whole or in part, and
+      all derivative works of the Software, unless such copies or derivative
+      works are solely in the form of machine-executable object code generated by
+      a source language processor.
+
+      THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+      IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+      FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
+      SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
+      FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
+      ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+      DEALINGS IN THE SOFTWARE.
+
+== Apache License 2.0
+
+>>>
+      Apache License
+      Version 2.0, January 2004
+      http://www.apache.org/licenses/
+
+      TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+      1. Definitions.
+
+         "License" shall mean the terms and conditions for use, reproduction,
+         and distribution as defined by Sections 1 through 9 of this document.
+
+         "Licensor" shall mean the copyright owner or entity authorized by
+         the copyright owner that is granting the License.
+
+         "Legal Entity" shall mean the union of the acting entity and all
+         other entities that control, are controlled by, or are under common
+         control with that entity. For the purposes of this definition,
+         "control" means (i) the power, direct or indirect, to cause the
+         direction or management of such entity, whether by contract or
+         otherwise, or (ii) ownership of fifty percent (50%) or more of the
+         outstanding shares, or (iii) beneficial ownership of such entity.
+
+         "You" (or "Your") shall mean an individual or Legal Entity
+         exercising permissions granted by this License.
+
+         "Source" form shall mean the preferred form for making modifications,
+         including but not limited to software source code, documentation
+         source, and configuration files.
+
+         "Object" form shall mean any form resulting from mechanical
+         transformation or translation of a Source form, including but
+         not limited to compiled object code, generated documentation,
+         and conversions to other media types.
+
+         "Work" shall mean the work of authorship, whether in Source or
+         Object form, made available under the License, as indicated by a
+         copyright notice that is included in or attached to the work
+         (an example is provided in the Appendix below).
+
+         "Derivative Works" shall mean any work, whether in Source or Object
+         form, that is based on (or derived from) the Work and for which the
+         editorial revisions, annotations, elaborations, or other modifications
+         represent, as a whole, an original work of authorship. For the purposes
+         of this License, Derivative Works shall not include works that remain
+         separable from, or merely link (or bind by name) to the interfaces of,
+         the Work and Derivative Works thereof.
+
+         "Contribution" shall mean any work of authorship, including
+         the original version of the Work and any modifications or additions
+         to that Work or Derivative Works thereof, that is intentionally
+         submitted to Licensor for inclusion in the Work by the copyright owner
+         or by an individual or Legal Entity authorized to submit on behalf of
+         the copyright owner. For the purposes of this definition, "submitted"
+         means any form of electronic, verbal, or written communication sent
+         to the Licensor or its representatives, including but not limited to
+         communication on electronic mailing lists, source code control systems,
+         and issue tracking systems that are managed by, or on behalf of, the
+         Licensor for the purpose of discussing and improving the Work, but
+         excluding communication that is conspicuously marked or otherwise
+         designated in writing by the copyright owner as "Not a Contribution."
+
+         "Contributor" shall mean Licensor and any individual or Legal Entity
+         on behalf of whom a Contribution has been received by Licensor and
+         subsequently incorporated within the Work.
+
+      2. Grant of Copyright License. Subject to the terms and conditions of
+         this License, each Contributor hereby grants to You a perpetual,
+         worldwide, non-exclusive, no-charge, royalty-free, irrevocable
+         copyright license to reproduce, prepare Derivative Works of,
+         publicly display, publicly perform, sublicense, and distribute the
+         Work and such Derivative Works in Source or Object form.
+
+      3. Grant of Patent License. Subject to the terms and conditions of
+         this License, each Contributor hereby grants to You a perpetual,
+         worldwide, non-exclusive, no-charge, royalty-free, irrevocable
+         (except as stated in this section) patent license to make, have made,
+         use, offer to sell, sell, import, and otherwise transfer the Work,
+         where such license applies only to those patent claims licensable
+         by such Contributor that are necessarily infringed by their
+         Contribution(s) alone or by combination of their Contribution(s)
+         with the Work to which such Contribution(s) was submitted. If You
+         institute patent litigation against any entity (including a
+         cross-claim or counterclaim in a lawsuit) alleging that the Work
+         or a Contribution incorporated within the Work constitutes direct
+         or contributory patent infringement, then any patent licenses
+         granted to You under this License for that Work shall terminate
+         as of the date such litigation is filed.
+
+      4. Redistribution. You may reproduce and distribute copies of the
+         Work or Derivative Works thereof in any medium, with or without
+         modifications, and in Source or Object form, provided that You
+         meet the following conditions:
+
+         a.  You must give any other recipients of the Work or
+             Derivative Works a copy of this License; and
+
+         b.  You must cause any modified files to carry prominent notices
+             stating that You changed the files; and
+
+         c.  You must retain, in the Source form of any Derivative Works
+             that You distribute, all copyright, patent, trademark, and
+             attribution notices from the Source form of the Work,
+             excluding those notices that do not pertain to any part of
+             the Derivative Works; and
+
+         d.  If the Work includes a "NOTICE" text file as part of its
+             distribution, then any Derivative Works that You distribute must
+             include a readable copy of the attribution notices contained
+             within such NOTICE file, excluding those notices that do not
+             pertain to any part of the Derivative Works, in at least one
+             of the following places: within a NOTICE text file distributed
+             as part of the Derivative Works; within the Source form or
+             documentation, if provided along with the Derivative Works; or,
+             within a display generated by the Derivative Works, if and
+             wherever such third-party notices normally appear. The contents
+             of the NOTICE file are for informational purposes only and
+             do not modify the License. You may add Your own attribution
+             notices within Derivative Works that You distribute, alongside
+             or as an addendum to the NOTICE text from the Work, provided
+             that such additional attribution notices cannot be construed
+             as modifying the License.
+
+         You may add Your own copyright statement to Your modifications and
+         may provide additional or different license terms and conditions
+         for use, reproduction, or distribution of Your modifications, or
+         for any such Derivative Works as a whole, provided Your use,
+         reproduction, and distribution of the Work otherwise complies with
+         the conditions stated in this License.
+
+      5. Submission of Contributions. Unless You explicitly state otherwise,
+         any Contribution intentionally submitted for inclusion in the Work
+         by You to the Licensor shall be under the terms and conditions of
+         this License, without any additional terms or conditions.
+         Notwithstanding the above, nothing herein shall supersede or modify
+         the terms of any separate license agreement you may have executed
+         with Licensor regarding such Contributions.
+
+      6. Trademarks. This License does not grant permission to use the trade
+         names, trademarks, service marks, or product names of the Licensor,
+         except as required for reasonable and customary use in describing the
+         origin of the Work and reproducing the content of the NOTICE file.
+
+      7. Disclaimer of Warranty. Unless required by applicable law or
+         agreed to in writing, Licensor provides the Work (and each
+         Contributor provides its Contributions) on an "AS IS" BASIS,
+         WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+         implied, including, without limitation, any warranties or conditions
+         of TITLE, NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A
+         PARTICULAR PURPOSE. You are solely responsible for determining the
+         appropriateness of using or redistributing the Work and assume any
+         risks associated with Your exercise of permissions under this License.
+
+      8. Limitation of Liability. In no event and under no legal theory,
+         whether in tort (including negligence), contract, or otherwise,
+         unless required by applicable law (such as deliberate and grossly
+         negligent acts) or agreed to in writing, shall any Contributor be
+         liable to You for damages, including any direct, indirect, special,
+         incidental, or consequential damages of any character arising as a
+         result of this License or out of the use or inability to use the
+         Work (including but not limited to damages for loss of goodwill,
+         work stoppage, computer failure or malfunction, or any and all
+         other commercial damages or losses), even if such Contributor
+         has been advised of the possibility of such damages.
+
+      9. Accepting Warranty or Additional Liability. While redistributing
+         the Work or Derivative Works thereof, You may choose to offer,
+         and charge a fee for, acceptance of support, warranty, indemnity,
+         or other liability obligations and/or rights consistent with this
+         License. However, in accepting such obligations, You may act only
+         on Your own behalf and on Your sole responsibility, not on behalf
+         of any other Contributor, and only if You agree to indemnify,
+         defend, and hold each Contributor harmless for any liability
+         incurred by, or claims asserted against, such Contributor by reason
+         of your accepting any such warranty or additional liability.
+
+      END OF TERMS AND CONDITIONS
+
+      APPENDIX: How to apply the Apache License to your work.
+
+      >>>
+         To apply the Apache License to your work, attach the following
+         boilerplate notice, with the fields enclosed by brackets "[]"
+         replaced with your own identifying information. (Don't include
+         the brackets!)  The text should be enclosed in the appropriate
+         comment syntax for the file format. We also recommend that a
+         file or class name and description of purpose be included on the
+         same "printed page" as the copyright notice for easier
+         identification within third-party archives.
+
+      Copyright [yyyy] [name of copyright owner]
+
+      Licensed under the Apache License, Version 2.0 (the "License");
+      you may not use this file except in compliance with the License.
+      You may obtain a copy of the License at
+
+          http://www.apache.org/licenses/LICENSE-2.0
+
+      Unless required by applicable law or agreed to in writing, software
+      distributed under the License is distributed on an "AS IS" BASIS,
+      WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+      See the License for the specific language governing permissions and
+      limitations under the License.
diff --git a/NEWS.md b/NEWS.md
index a4b686789f..2b021e7cdd 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -1,255 +1,87 @@
-# NEWS for Ruby 3.2.0
+# NEWS for Ruby 4.1.0
 
 This document is a list of user-visible feature changes
-since the **3.1.0** release, except for bug fixes.
+since the **4.0.0** release, except for bug fixes.
 
 Note that each entry is kept to a minimum, see links for details.
 
 ## Language changes
 
-* Anonymous rest and keyword rest arguments can now be passed as
-  arguments, instead of just used in method parameters.
-  [[Feature #18351]]
-
-    ```ruby
-    def foo(*)
-      bar(*)
-    end
-    def baz(**)
-      quux(**)
-    end
-    ```
-
-* A proc that accepts a single positional argument and keywords will
-  no longer autosplat. [[Bug #18633]]
-
-  ```ruby
-  proc{|a, **k| a}.call([1, 2])
-  # Ruby 3.1 and before
-  # => 1
-  # Ruby 3.2 and after
-  # => [1, 2]
-  ```
-
-* Constant assignment evaluation order for constants set on explicit
-  objects has been made consistent with single attribute assignment
-  evaluation order. With this code:
-
-    ```ruby
-    foo::BAR = baz
-    ```
-
-  `foo` is now called before `baz`. Similarly, for multiple assignments
-  to constants,  left-to-right evaluation order is used. With this
-  code:
-
-    ```ruby
-      foo1::BAR1, foo2::BAR2 = baz1, baz2
-    ```
-
-  The following evaluation order is now used:
-
-  1. `foo1`
-  2. `foo2`
-  3. `baz1`
-  4. `baz2`
-
-  [[Bug #15928]]
-
-* Find pattern is no longer experimental.
-  [[Feature #18585]]
-
-* Methods taking a rest parameter (like `*args`) and wishing to delegate keyword
-  arguments through `foo(*args)` must now be marked with `ruby2_keywords`
-  (if not already the case). In other words, all methods wishing to delegate
-  keyword arguments through `*args` must now be marked with `ruby2_keywords`,
-  with no exception. This will make it easier to transition to other ways of
-  delegation once a library can require Ruby 3+. Previously, the `ruby2_keywords`
-  flag was kept if the receiving method took `*args`, but this was a bug and an
-  inconsistency. A good technique to find the potentially-missing `ruby2_keywords`
-  is to run the test suite, for where it fails find the last method which must
-  receive keyword arguments, use `puts nil, caller, nil` there, and check each
-  method/block on the call chain which must delegate keywords is correctly marked
-  as `ruby2_keywords`. [[Bug #18625]] [[Bug #16466]]
-
-    ```ruby
-    def target(**kw)
-    end
-
-    # Accidentally worked without ruby2_keywords in Ruby 2.7-3.1, ruby2_keywords
-    # needed in 3.2+. Just like (*args, **kwargs) or (...) would be needed on
-    # both #foo and #bar when migrating away from ruby2_keywords.
-    ruby2_keywords def bar(*args)
-      target(*args)
-    end
-
-    ruby2_keywords def foo(*args)
-      bar(*args)
-    end
-
-    foo(k: 1)
-    ```
-
-## Command line options
-
 ## Core classes updates
 
 Note: We're only listing outstanding class updates.
 
-* Hash
-    * Hash#shift now always returns nil if the hash is
-      empty, instead of returning the default value or
-      calling the default proc. [[Bug #16908]]
+* Method
 
-* Kernel
-    * Kernel#binding raises RuntimeError if called from a non-Ruby frame
-      (such as a method defined in C). [[Bug #18487]]
+    * `Method#source_location`, `Proc#source_location`, and
+      `UnboundMethod#source_location` now return extended location
+      information with 5 elements: `[path, start_line, start_column,
+      end_line, end_column]`. The previous 2-element format `[path,
+      line]` can still be obtained by calling `.take(2)` on the result.
+      [[Feature #6012]]
 
-* MatchData
-    * MatchData#byteoffset has been added. [[Feature #13110]]
+* Set
 
-* Module
-    * Module.used_refinements has been added. [[Feature #14332]]
-    * Module#refinements has been added. [[Feature #12737]]
-    * Module#const_added has been added. [[Feature #17881]]
+    * A deprecated behavior, `Set#to_set`, `Range#to_set`, and
+      `Enumerable#to_set` accepting arguments, was removed.  [[Feature #21390]]
 
-* Proc
-    * Proc#dup returns an instance of subclass. [[Bug #17545]]
-    * Proc#parameters now accepts lambda keyword. [[Feature #15357]]
+## Stdlib updates
 
-* Refinement
-    * Refinement#refined_class has been added. [[Feature #12737]]
+### The following bundled gems are added.
 
-* Set
-    * Set is now available as a built-in class without the need for `require "set"`. [[Feature #16989]]
-      It is currently autoloaded via the `Set` constant or a call to `Enumerable#to_set`.
-
-* String
-    * String#byteindex and String#byterindex have been added. [[Feature #13110]]
-    * Update Unicode to Version 14.0.0 and Emoji Version 14.0. [[Feature #18037]]
-      (also applies to Regexp)
-    * String#bytesplice has been added.  [[Feature #18598]]
-
-* Struct
-    * A Struct class can also be initialized with keyword arguments
-      without `keyword_init: true` on `Struct.new` [[Feature #16806]]
-
-* TracePoint
-    * TracePoint#binding now returns `nil` for `c_call`/`c_return` TracePoints.
-      [[Bug #18487]]
-    * TracePoint#enable `target_thread` keyword argument now defaults to the
-      current thread if `target` and `target_line` keyword arguments are not
-      passed. [[Bug #16889]]
 
-## Stdlib updates
-
-*   The following default gems are updated.
-    * RubyGems 3.4.0.dev
-    * bigdecimal 3.1.2
-    * bundler 2.4.0.dev
-    * cgi 0.3.2
-    * etc 1.4.0
-    * io-console 0.5.11
-    * io-wait 0.2.3
-    * ipaddr 1.2.4
-    * logger 1.5.1
-    * net-http 0.2.2
-    * net-protocol 0.1.3
-    * ostruct 0.5.5
-    * reline 0.3.1
-    * securerandom 0.2.0
-    * stringio 3.0.3
-*   The following bundled gems are updated.
-    * net-imap 0.2.3
-    * rbs 2.4.0
-    * typeprof 0.21.2
-    * debug 1.5.0
-*   The following default gems are now bundled gems.
+We only list stdlib changes that are notable feature changes.
 
-## Compatibility issues
+Other changes are listed in the following sections. We also listed release
+history from the previous bundled version that is Ruby 3.4.0 if it has GitHub
+releases.
 
-Note: Excluding feature bug fixes.
+### The following bundled gem is promoted from default gems.
 
-### Removed constants
+* tsort 0.2.0
 
-The following deprecated constants are removed.
+### The following default gem is added.
 
-* `Fixnum` and `Bignum` [[Feature #12005]]
-* `Random::DEFAULT` [[Feature #17351]]
-* `Struct::Group`
-* `Struct::Passwd`
+### The following default gems are updated.
 
-### Removed methods
+* RubyGems 4.1.0.dev
+* bundler 4.1.0.dev
+* prism 1.8.0
+* stringio 3.2.1.dev
+* strscan 3.1.7.dev
 
-The following deprecated methods are removed.
+### The following bundled gems are updated.
 
-* `Dir.exists?` [[Feature #17391]]
-* `File.exists?` [[Feature #17391]]
-* `Kernel#=~` [[Feature #15231]]
-* `Kernel#taint`, `Kernel#untaint`, `Kernel#tainted?`
-  [[Feature #16131]]
-* `Kernel#trust`, `Kernel#untrust`, `Kernel#untrusted?`
-  [[Feature #16131]]
+* minitest 6.0.1
+* test-unit 3.7.7
+* rss 0.3.2
+* net-imap 0.6.2
+* rbs 3.10.2
+* typeprof 0.31.1
+* debug 1.11.1
+* mutex_m 0.3.0
+* resolv-replace 0.2.0
+* rdoc 7.1.0
 
-## Stdlib compatibility issues
+### RubyGems and Bundler
 
-* `Psych` no longer bundles libyaml sources.
-  Users need to install the libyaml library themselves via the package
-  system. [[Feature #18571]]
+Ruby 4.0 bundled RubyGems and Bundler version 4. see the following links for details.
 
-## C API updates
+## Supported platforms
 
-### Removed C APIs
+## Compatibility issues
 
-The following deprecated APIs are removed.
+## Stdlib compatibility issues
 
-* `rb_cData` variable.
-* "taintedness" and "trustedness" functions. [[Feature #16131]]
+## C API updates
 
 ## Implementation improvements
 
+### Ractor
+
+A lot of work has gone into making Ractors more stable, performant, and usable. These improvements bring Ractor implementation closer to leaving experimental status.
+
 ## JIT
 
-### MJIT
-
-### YJIT: New experimental in-process JIT compiler
-
-## Static analysis
-
-### RBS
-
-### TypeProf
-
-## Debugger
-
-## error_highlight
-
-## IRB Autocomplete and Document Display
-
-## Miscellaneous changes
-
-[Feature #12005]: https://bugs.ruby-lang.org/issues/12005
-[Feature #12737]: https://bugs.ruby-lang.org/issues/12737
-[Feature #13110]: https://bugs.ruby-lang.org/issues/13110
-[Feature #14332]: https://bugs.ruby-lang.org/issues/14332
-[Feature #15231]: https://bugs.ruby-lang.org/issues/15231
-[Feature #15357]: https://bugs.ruby-lang.org/issues/15357
-[Bug #15928]:     https://bugs.ruby-lang.org/issues/15928
-[Feature #16131]: https://bugs.ruby-lang.org/issues/16131
-[Bug #16466]:     https://bugs.ruby-lang.org/issues/16466
-[Feature #16806]: https://bugs.ruby-lang.org/issues/16806
-[Bug #16889]:     https://bugs.ruby-lang.org/issues/16889
-[Bug #16908]:     https://bugs.ruby-lang.org/issues/16908
-[Feature #16989]: https://bugs.ruby-lang.org/issues/16989
-[Feature #17351]: https://bugs.ruby-lang.org/issues/17351
-[Feature #17391]: https://bugs.ruby-lang.org/issues/17391
-[Bug #17545]:     https://bugs.ruby-lang.org/issues/17545
-[Feature #17881]: https://bugs.ruby-lang.org/issues/17881
-[Feature #18037]: https://bugs.ruby-lang.org/issues/18037
-[Feature #18351]: https://bugs.ruby-lang.org/issues/18351
-[Bug #18487]:     https://bugs.ruby-lang.org/issues/18487
-[Feature #18571]: https://bugs.ruby-lang.org/issues/18571
-[Feature #18585]: https://bugs.ruby-lang.org/issues/18585
-[Feature #18598]: https://bugs.ruby-lang.org/issues/18598
-[Bug #18625]:     https://bugs.ruby-lang.org/issues/18625
-[Bug #18633]:     https://bugs.ruby-lang.org/issues/18633
+[Feature #6012]: https://bugs.ruby-lang.org/issues/6012
+[Feature #21390]: https://bugs.ruby-lang.org/issues/21390
diff --git a/README.ja.md b/README.ja.md
index bb69c09055..9bbc3a83a5 100644
--- a/README.ja.md
+++ b/README.ja.md
@@ -1,10 +1,10 @@
 [![Actions Status: MinGW](https://github.com/ruby/ruby/workflows/MinGW/badge.svg)](https://github.com/ruby/ruby/actions?query=workflow%3A"MinGW")
-[![Actions Status: MJIT](https://github.com/ruby/ruby/workflows/MJIT/badge.svg)](https://github.com/ruby/ruby/actions?query=workflow%3A"MJIT")
 [![Actions Status: Ubuntu](https://github.com/ruby/ruby/workflows/Ubuntu/badge.svg)](https://github.com/ruby/ruby/actions?query=workflow%3A"Ubuntu")
 [![Actions Status: Windows](https://github.com/ruby/ruby/workflows/Windows/badge.svg)](https://github.com/ruby/ruby/actions?query=workflow%3A"Windows")
 [![AppVeyor status](https://ci.appveyor.com/api/projects/status/0sy8rrxut4o0k960/branch/master?svg=true)](https://ci.appveyor.com/project/ruby/ruby/branch/master)
 [![Travis Status](https://app.travis-ci.com/ruby/ruby.svg?branch=master)](https://app.travis-ci.com/ruby/ruby)
-[![Cirrus Status](https://api.cirrus-ci.com/github/ruby/ruby.svg)](https://cirrus-ci.com/github/ruby/ruby/master)
+
+[English](rdoc-ref:README.md)
 
 # Rubyとは
 
@@ -26,7 +26,7 @@ Rubyはテキスト処理関係の能力などに優れ，Perlと同じくらい
 *   ダイナミックローディング (アーキテクチャによる)
 *   移植性が高い．多くのUnix-like/POSIX互換プラットフォーム上で動くだけでなく，Windows， macOS，
     Haikuなどの上でも動く cf.
-    https://github.com/ruby/ruby/blob/master/doc/contributing.rdoc#platform-maintainers
+    https://docs.ruby-lang.org/en/master/maintainers_md.html#label-Platform+Maintainers
 
 
 ## 入手法
@@ -41,26 +41,19 @@ https://www.ruby-lang.org/ja/downloads/
 
 ミラーをGitHubに公開しています． 以下のコマンドでリポジトリを取得できます．
 
-    $ git clone https://github.com/ruby/ruby.git
+```console
+$ git clone https://github.com/ruby/ruby.git
+```
 
 他のブランチの一覧は次のコマンドで見られます．
 
-    $ git ls-remote https://github.com/ruby/ruby.git
+```console
+$ git ls-remote https://github.com/ruby/ruby.git
+```
 
 Rubyリポジトリの本来のmasterは https://git.ruby-lang.org/ruby.git にあります．
 コミッタはこちらを使います．
 
-### Subversion
-
-古いRubyのバージョンのソースコードは次のコマンドでも取得できます．
-
-    $ svn co https://svn.ruby-lang.org/repos/ruby/branches/ruby_2_6/ ruby
-
-他のブランチの一覧は次のコマンドで見られます．
-
-    $ svn ls https://svn.ruby-lang.org/repos/ruby/branches/
-
-
 ## ホームページ
 
 RubyのホームページのURLは
@@ -71,20 +64,20 @@ https://www.ruby-lang.org/
 
 ## メーリングリスト
 
-Rubyのメーリングリストがあります．参加希望の方は [ruby-list-request@ruby-lang.org] まで本文に
+Rubyのメーリングリストがあります．参加希望の方は [ruby-list-request@ml.ruby-lang.org] まで件名に
 
-    subscribe
+    join
 
 と書いて送って下さい．
 
 Ruby開発者向けメーリングリストもあります．こちらではrubyのバグ，将来の仕様拡張など実装上の問題について議論されています．
-参加希望の方は [ruby-dev-request@ruby-lang.org] までruby-listと同様の方法でメールしてください．
+参加希望の方は [ruby-dev-request@ml.ruby-lang.org] までruby-listと同様の方法でメールしてください．
 
 Ruby拡張モジュールについて話し合うruby-extメーリングリストと数学関係の話題について話し合うruby-mathメーリングリストと
 英語でrubyについて話し合うruby-talkメーリングリストもあります．参加方法はどれも同じです．
 
-[ruby-list-request@ruby-lang.org]: mailto:ruby-list-request@ruby-lang.org?subject=Join%20Ruby%20Mailing%20List&body=subscribe
-[ruby-dev-request@ruby-lang.org]: mailto:ruby-dev-request@ruby-lang.org?subject=Join%20Ruby%20Mailing%20List&body=subscribe
+[ruby-list-request@ml.ruby-lang.org]: mailto:ruby-list-request@ml.ruby-lang.org?subject=join
+[ruby-dev-request@ml.ruby-lang.org]: mailto:ruby-dev-request@ml.ruby-lang.org?subject=join
 
 ## コンパイル・インストール
 
@@ -163,7 +156,7 @@ UNIXであれば `configure` がほとんどの差異を吸収してくれるは
 
 ## 配布条件
 
-[COPYING.ja](COPYING.ja) ファイルを参照してください．
+[COPYING.ja](https://docs.ruby-lang.org/en/master/COPYING_ja.html) ファイルを参照してください．
 
 ## フィードバック
 
diff --git a/README.md b/README.md
index 0350ec3fb2..02435b419e 100644
--- a/README.md
+++ b/README.md
@@ -1,10 +1,9 @@
 [![Actions Status: MinGW](https://github.com/ruby/ruby/workflows/MinGW/badge.svg)](https://github.com/ruby/ruby/actions?query=workflow%3A"MinGW")
-[![Actions Status: MJIT](https://github.com/ruby/ruby/workflows/MJIT/badge.svg)](https://github.com/ruby/ruby/actions?query=workflow%3A"MJIT")
 [![Actions Status: Ubuntu](https://github.com/ruby/ruby/workflows/Ubuntu/badge.svg)](https://github.com/ruby/ruby/actions?query=workflow%3A"Ubuntu")
 [![Actions Status: Windows](https://github.com/ruby/ruby/workflows/Windows/badge.svg)](https://github.com/ruby/ruby/actions?query=workflow%3A"Windows")
-[![AppVeyor status](https://ci.appveyor.com/api/projects/status/0sy8rrxut4o0k960/branch/master?svg=true)](https://ci.appveyor.com/project/ruby/ruby/branch/master)
 [![Travis Status](https://app.travis-ci.com/ruby/ruby.svg?branch=master)](https://app.travis-ci.com/ruby/ruby)
-[![Cirrus Status](https://api.cirrus-ci.com/github/ruby/ruby.svg)](https://cirrus-ci.com/github/ruby/ruby/master)
+
+[日本語](rdoc-ref:README.ja.md)
 
 # What is Ruby?
 
@@ -25,7 +24,7 @@ It is simple, straightforward, and extensible.
 * Dynamic Loading of Object Files (on some architectures)
 * Highly Portable (works on many Unix-like/POSIX compatible platforms as
   well as Windows, macOS, etc.) cf.
-  https://github.com/ruby/ruby/blob/master/doc/maintainers.rdoc#label-Platform+Maintainers
+    https://docs.ruby-lang.org/en/master/maintainers_md.html#label-Platform+Maintainers
 
 ## How to get Ruby
 
@@ -34,7 +33,10 @@ like rvm, see:
 
 https://www.ruby-lang.org/en/downloads/
 
-### Git
+You can download release packages and the snapshot of the repository. If you want to
+download whole versions of Ruby, please visit https://www.ruby-lang.org/en/downloads/releases/.
+
+### Download with Git
 
 The mirror of the Ruby source tree can be checked out with the following command:
 
@@ -48,31 +50,29 @@ to see the list of branches:
 You may also want to use https://git.ruby-lang.org/ruby.git (actual master of Ruby source)
 if you are a committer.
 
-### Subversion
-
-Stable branches for older Ruby versions can be checked out with also the
-following command:
-
-    $ svn co https://svn.ruby-lang.org/repos/ruby/branches/ruby_2_6/ ruby
+## How to build
 
-Try the following command to see the list of branches:
-
-    $ svn ls https://svn.ruby-lang.org/repos/ruby/branches/
+See [Building Ruby](https://docs.ruby-lang.org/en/master/contributing/building_ruby_md.html)
 
 ## Ruby home page
 
 https://www.ruby-lang.org/
 
+## Documentation
+
+- [English](https://docs.ruby-lang.org/en/master/index.html)
+- [Japanese](https://docs.ruby-lang.org/ja/master/index.html)
+
 ## Mailing list
 
 There is a mailing list to discuss Ruby. To subscribe to this list, please
 send the following phrase:
 
-    subscribe
+    join
 
-in the mail body (not subject) to the address [ruby-talk-request@ruby-lang.org].
+in the mail subject (not body) to the address [ruby-talk-request@ml.ruby-lang.org].
 
-[ruby-talk-request@ruby-lang.org]: mailto:ruby-talk-request@ruby-lang.org?subject=Join%20Ruby%20Mailing%20List&body=subscribe
+[ruby-talk-request@ml.ruby-lang.org]: mailto:ruby-talk-request@ml.ruby-lang.org?subject=join
 
 ## Copying
 
@@ -83,11 +83,11 @@ See the file [COPYING](rdoc-ref:COPYING).
 Questions about the Ruby language can be asked on the [Ruby-Talk](https://www.ruby-lang.org/en/community/mailing-lists) mailing list
 or on websites like https://stackoverflow.com.
 
-Bugs should be reported at https://bugs.ruby-lang.org. Read ["Reporting Issues"](https://docs.ruby-lang.org/en/master/reporting_issues_md.html) for more information.
+Bugs should be reported at https://bugs.ruby-lang.org. Read ["Reporting Issues"](https://docs.ruby-lang.org/en/master/contributing/reporting_issues_md.html) for more information.
 
 ## Contributing
 
-See ["Contributing to Ruby"](https://docs.ruby-lang.org/en/master/contributing_md.html), which includes setup and build instructions.
+See ["Contributing to Ruby"](https://docs.ruby-lang.org/en/master/contributing/contributing_md.html), which includes setup and build instructions.
 
 ## The Author
 
diff --git a/addr2line.c b/addr2line.c
index f660be9129..19a6a425c1 100644
--- a/addr2line.c
+++ b/addr2line.c
@@ -8,10 +8,14 @@
 
 **********************************************************************/
 
-#if defined(__clang__)
+#if defined(__clang__) && defined(__has_warning)
+#if __has_warning("-Wgnu-empty-initializer")
 #pragma clang diagnostic ignored "-Wgnu-empty-initializer"
+#endif
+#if __has_warning("-Wgcc-compat")
 #pragma clang diagnostic ignored "-Wgcc-compat"
 #endif
+#endif
 
 #include "ruby/internal/config.h"
 #include "ruby/defines.h"
@@ -52,13 +56,26 @@
 #  ifdef _AIX
 #pragma alloca
 #  else
-#   ifndef alloca		/* predefined by HP cc +Olibcalls */
+#   ifndef alloca                /* predefined by HP cc +Olibcalls */
 void *alloca();
 #   endif
 #  endif /* AIX */
-# endif	/* HAVE_ALLOCA_H */
+# endif        /* HAVE_ALLOCA_H */
+# ifndef UNREACHABLE
+#  define UNREACHABLE __builtin_unreachable()
+# endif
+# ifndef UNREACHABLE_RETURN
+#  define UNREACHABLE_RETURN(_) __builtin_unreachable()
+# endif
 #endif /* __GNUC__ */
 
+#ifndef UNREACHABLE
+# define UNREACHABLE abort()
+#endif
+#ifndef UNREACHABLE_RETURN
+# define UNREACHABLE_RETURN(_) return (abort(), (_))
+#endif
+
 #ifdef HAVE_DLADDR
 # include <dlfcn.h>
 #endif
@@ -127,7 +144,7 @@ void *alloca();
 #define DW_LNE_define_file              0x03
 #define DW_LNE_set_discriminator        0x04  /* DWARF4 */
 
-PRINTF_ARGS(static int kprintf(const char *fmt, ...), 1, 2);
+#define kprintf(...) fprintf(errout, "" __VA_ARGS__)
 
 typedef struct line_info {
     const char *dirname;
@@ -159,12 +176,15 @@ typedef struct obj_info {
     struct dwarf_section debug_info;
     struct dwarf_section debug_line;
     struct dwarf_section debug_ranges;
+    struct dwarf_section debug_str_offsets;
+    struct dwarf_section debug_addr;
     struct dwarf_section debug_rnglists;
     struct dwarf_section debug_str;
+    struct dwarf_section debug_line_str;
     struct obj_info *next;
 } obj_info_t;
 
-#define DWARF_SECTION_COUNT 6
+#define DWARF_SECTION_COUNT 9
 
 static struct dwarf_section *
 obj_dwarf_section_at(obj_info_t *obj, int n)
@@ -174,11 +194,14 @@ obj_dwarf_section_at(obj_info_t *obj, int n)
         &obj->debug_info,
         &obj->debug_line,
         &obj->debug_ranges,
+        &obj->debug_str_offsets,
+        &obj->debug_addr,
         &obj->debug_rnglists,
-        &obj->debug_str
+        &obj->debug_str,
+        &obj->debug_line_str
     };
     if (n < 0 || DWARF_SECTION_COUNT <= n) {
-        abort();
+        UNREACHABLE_RETURN(0);
     }
     return ary[n];
 }
@@ -197,13 +220,13 @@ uleb128(const char **p)
     unsigned long r = 0;
     int s = 0;
     for (;;) {
-	unsigned char b = (unsigned char)*(*p)++;
-	if (b < 0x80) {
-	    r += (unsigned long)b << s;
-	    break;
-	}
-	r += (b & 0x7f) << s;
-	s += 7;
+        unsigned char b = (unsigned char)*(*p)++;
+        if (b < 0x80) {
+            r += (unsigned long)b << s;
+            break;
+        }
+        r += (b & 0x7f) << s;
+        s += 7;
     }
     return r;
 }
@@ -214,85 +237,103 @@ sleb128(const char **p)
     long r = 0;
     int s = 0;
     for (;;) {
-	unsigned char b = (unsigned char)*(*p)++;
-	if (b < 0x80) {
-	    if (b & 0x40) {
-		r -= (0x80 - b) << s;
-	    }
-	    else {
-		r += (b & 0x3f) << s;
-	    }
-	    break;
-	}
-	r += (b & 0x7f) << s;
-	s += 7;
+        unsigned char b = (unsigned char)*(*p)++;
+        if (b < 0x80) {
+            if (b & 0x40) {
+                r -= (0x80 - b) << s;
+            }
+            else {
+                r += (b & 0x3f) << s;
+            }
+            break;
+        }
+        r += (b & 0x7f) << s;
+        s += 7;
     }
     return r;
 }
 
 static const char *
-get_nth_dirname(unsigned long dir, const char *p)
+get_nth_dirname(unsigned long dir, const char *p, FILE *errout)
 {
     if (!dir--) {
-	return "";
+        return "";
     }
     while (dir--) {
-	while (*p) p++;
-	p++;
-	if (!*p) {
-	    kprintf("Unexpected directory number %lu in %s\n",
-		    dir, binary_filename);
-	    return "";
-	}
+        while (*p) p++;
+        p++;
+        if (!*p) {
+            kprintf("Unexpected directory number %lu in %s\n",
+                    dir, binary_filename);
+            return "";
+        }
     }
     return p;
 }
 
+static const char *parse_ver5_debug_line_header(
+    const char *p, int idx, uint8_t format,
+    obj_info_t *obj, const char **out_path,
+    uint64_t *out_directory_index, FILE *errout);
+
 static void
-fill_filename(int file, const char *include_directories, const char *filenames, line_info_t *line, obj_info_t *obj)
+fill_filename(int file, uint8_t format, uint16_t version, const char *include_directories,
+              const char *filenames, line_info_t *line, obj_info_t *obj, FILE *errout)
 {
     int i;
     const char *p = filenames;
     const char *filename;
     unsigned long dir;
-    for (i = 1; i <= file; i++) {
-	filename = p;
-	if (!*p) {
-	    /* Need to output binary file name? */
-	    kprintf("Unexpected file number %d in %s at %tx\n",
-		    file, binary_filename, filenames - obj->mapped);
-	    return;
-	}
-	while (*p) p++;
-	p++;
-	dir = uleb128(&p);
-	/* last modified. */
-	uleb128(&p);
-	/* size of the file. */
-	uleb128(&p);
-
-	if (i == file) {
-	    line->filename = filename;
-	    line->dirname = get_nth_dirname(dir, include_directories);
-	}
+    if (version >= 5) {
+        const char *path;
+        uint64_t directory_index = -1;
+        parse_ver5_debug_line_header(filenames, file, format, obj, &path, &directory_index, errout);
+        line->filename = path;
+        parse_ver5_debug_line_header(include_directories, (int)directory_index, format, obj, &path, NULL, errout);
+        line->dirname = path;
+    }
+    else {
+        for (i = 1; i <= file; i++) {
+            filename = p;
+            if (!*p) {
+#ifndef __APPLE__
+                /* Need to output binary file name? */
+                kprintf("Unexpected file number %d in %s at %tx\n",
+                        file, binary_filename, filenames - obj->mapped);
+#endif
+                return;
+            }
+            while (*p) p++;
+            p++;
+            dir = uleb128(&p);
+            /* last modified. */
+            uleb128(&p);
+            /* size of the file. */
+            uleb128(&p);
+
+            if (i == file) {
+                line->filename = filename;
+                line->dirname = get_nth_dirname(dir, include_directories, errout);
+            }
+        }
     }
 }
 
 static void
 fill_line(int num_traces, void **traces, uintptr_t addr, int file, int line,
-	  const char *include_directories, const char *filenames,
-	  obj_info_t *obj, line_info_t *lines, int offset)
+          uint8_t format, uint16_t version, const char *include_directories, const char *filenames,
+          obj_info_t *obj, line_info_t *lines, int offset, FILE *errout)
 {
     int i;
     addr += obj->base_addr - obj->vmaddr;
     for (i = offset; i < num_traces; i++) {
-	uintptr_t a = (uintptr_t)traces[i];
-	/* We assume one line code doesn't result >100 bytes of native code.
+        uintptr_t a = (uintptr_t)traces[i];
+        /* We assume one line code doesn't result >100 bytes of native code.
        We may want more reliable way eventually... */
-	if (addr < a && a < addr + 100) {
-	    fill_filename(file, include_directories, filenames, &lines[i], obj);
-	    lines[i].line = line;
-	}
+        if (addr < a && a < addr + 100) {
+            fill_filename(file, format, version, include_directories, filenames, &lines[i], obj, errout);
+            lines[i].line = line;
+        }
     }
 }
 
@@ -315,7 +356,7 @@ struct LineNumberProgramHeader {
 };
 
 static int
-parse_debug_line_header(const char **pp, struct LineNumberProgramHeader *header)
+parse_debug_line_header(obj_info_t *obj, const char **pp, struct LineNumberProgramHeader *header, FILE *errout)
 {
     const char *p = *pp;
     header->unit_length = *(uint32_t *)p;
@@ -323,8 +364,8 @@ parse_debug_line_header(const char **pp, struct LineNumberProgramHeader *header)
 
     header->format = 4;
     if (header->unit_length == 0xffffffff) {
-	header->unit_length = *(uint64_t *)p;
-	p += sizeof(uint64_t);
+        header->unit_length = *(uint64_t *)p;
+        p += sizeof(uint64_t);
         header->format = 8;
     }
 
@@ -332,7 +373,13 @@ parse_debug_line_header(const char **pp, struct LineNumberProgramHeader *header)
 
     header->version = *(uint16_t *)p;
     p += sizeof(uint16_t);
-    if (header->version > 4) return -1;
+    if (header->version > 5) return -1;
+
+    if (header->version >= 5) {
+        /* address_size = *(uint8_t *)p++; */
+        /* segment_selector_size = *(uint8_t *)p++; */
+        p += 2;
+    }
 
     header->header_length = header->format == 4 ? *(uint32_t *)p : *(uint64_t *)p;
     p += header->format;
@@ -353,20 +400,27 @@ parse_debug_line_header(const char **pp, struct LineNumberProgramHeader *header)
     /* header->standard_opcode_lengths = (uint8_t *)p - 1; */
     p += header->opcode_base - 1;
 
-    header->include_directories = p;
+    if (header->version >= 5) {
+        header->include_directories = p;
+        p = parse_ver5_debug_line_header(p, -1, header->format, obj, NULL, NULL, errout);
+        header->filenames = p;
+    }
+    else {
+        header->include_directories = p;
 
-    /* temporary measure for compress-debug-sections */
-    if (p >= header->cu_end) return -1;
+        /* temporary measure for compress-debug-sections */
+        if (p >= header->cu_end) return -1;
 
-    /* skip include directories */
-    while (*p) {
-	p = memchr(p, '\0', header->cu_end - p);
-	if (!p) return -1;
-	p++;
-    }
-    p++;
+        /* skip include directories */
+        while (*p) {
+            p = memchr(p, '\0', header->cu_end - p);
+            if (!p) return -1;
+            p++;
+        }
+        p++;
 
-    header->filenames = p;
+        header->filenames = p;
+    }
 
     *pp = header->cu_start;
 
@@ -375,7 +429,7 @@ parse_debug_line_header(const char **pp, struct LineNumberProgramHeader *header)
 
 static int
 parse_debug_line_cu(int num_traces, void **traces, const char **debug_line,
-		obj_info_t *obj, line_info_t *lines, int offset)
+                obj_info_t *obj, line_info_t *lines, int offset, FILE *errout)
 {
     const char *p = (const char *)*debug_line;
     struct LineNumberProgramHeader header;
@@ -392,107 +446,109 @@ parse_debug_line_cu(int num_traces, void **traces, const char **debug_line,
     /* int epilogue_begin = 0; */
     /* unsigned int isa = 0; */
 
-    if (parse_debug_line_header(&p, &header))
+    if (parse_debug_line_header(obj, &p, &header, errout))
         return -1;
     is_stmt = header.default_is_stmt;
 
-#define FILL_LINE()						    \
-    do {							    \
-	fill_line(num_traces, traces, addr, file, line,		    \
+#define FILL_LINE()                                                 \
+    do {                                                            \
+        fill_line(num_traces, traces, addr, file, line,             \
+                  header.format,                                    \
+                  header.version,                                   \
                   header.include_directories,                       \
                   header.filenames,                                 \
-		  obj, lines, offset);				    \
-	/*basic_block = prologue_end = epilogue_begin = 0;*/	    \
+                  obj, lines, offset, errout);                      \
+        /*basic_block = prologue_end = epilogue_begin = 0;*/        \
     } while (0)
 
     while (p < header.cu_end) {
-	unsigned long a;
-	unsigned char op = *p++;
-	switch (op) {
-	case DW_LNS_copy:
-	    FILL_LINE();
-	    break;
-	case DW_LNS_advance_pc:
-	    a = uleb128(&p) * header.minimum_instruction_length;
-	    addr += a;
-	    break;
-	case DW_LNS_advance_line: {
-	    long a = sleb128(&p);
-	    line += a;
-	    break;
-	}
-	case DW_LNS_set_file:
-	    file = (unsigned int)uleb128(&p);
-	    break;
-	case DW_LNS_set_column:
-	    /*column = (unsigned int)*/(void)uleb128(&p);
-	    break;
-	case DW_LNS_negate_stmt:
-	    is_stmt = !is_stmt;
-	    break;
-	case DW_LNS_set_basic_block:
-	    /*basic_block = 1; */
-	    break;
-	case DW_LNS_const_add_pc:
-	    a = ((255UL - header.opcode_base) / header.line_range) *
-		header.minimum_instruction_length;
-	    addr += a;
-	    break;
-	case DW_LNS_fixed_advance_pc:
-	    a = *(uint16_t *)p;
-	    p += sizeof(uint16_t);
-	    addr += a;
-	    break;
-	case DW_LNS_set_prologue_end:
-	    /* prologue_end = 1; */
-	    break;
-	case DW_LNS_set_epilogue_begin:
-	    /* epilogue_begin = 1; */
-	    break;
-	case DW_LNS_set_isa:
-	    /* isa = (unsigned int)*/(void)uleb128(&p);
-	    break;
-	case 0:
-	    a = uleb128(&p);
-	    op = *p++;
-	    switch (op) {
-	    case DW_LNE_end_sequence:
-		/* end_sequence = 1; */
-		FILL_LINE();
-		addr = 0;
-		file = 1;
-		line = 1;
-		/* column = 0; */
-		is_stmt = header.default_is_stmt;
-		/* end_sequence = 0; */
-		/* isa = 0; */
-		break;
-	    case DW_LNE_set_address:
-		addr = *(unsigned long *)p;
-		p += sizeof(unsigned long);
-		break;
-	    case DW_LNE_define_file:
-		kprintf("Unsupported operation in %s\n",
-			binary_filename);
-		break;
-	    case DW_LNE_set_discriminator:
-		/* TODO:currently ignore */
-		uleb128(&p);
-		break;
-	    default:
-		kprintf("Unknown extended opcode: %d in %s\n",
-			op, binary_filename);
-	    }
-	    break;
-	default: {
+        unsigned long a;
+        unsigned char op = *p++;
+        switch (op) {
+        case DW_LNS_copy:
+            FILL_LINE();
+            break;
+        case DW_LNS_advance_pc:
+            a = uleb128(&p) * header.minimum_instruction_length;
+            addr += a;
+            break;
+        case DW_LNS_advance_line: {
+            long a = sleb128(&p);
+            line += a;
+            break;
+        }
+        case DW_LNS_set_file:
+            file = (unsigned int)uleb128(&p);
+            break;
+        case DW_LNS_set_column:
+            /*column = (unsigned int)*/(void)uleb128(&p);
+            break;
+        case DW_LNS_negate_stmt:
+            is_stmt = !is_stmt;
+            break;
+        case DW_LNS_set_basic_block:
+            /*basic_block = 1; */
+            break;
+        case DW_LNS_const_add_pc:
+            a = ((255UL - header.opcode_base) / header.line_range) *
+                header.minimum_instruction_length;
+            addr += a;
+            break;
+        case DW_LNS_fixed_advance_pc:
+            a = *(uint16_t *)p;
+            p += sizeof(uint16_t);
+            addr += a;
+            break;
+        case DW_LNS_set_prologue_end:
+            /* prologue_end = 1; */
+            break;
+        case DW_LNS_set_epilogue_begin:
+            /* epilogue_begin = 1; */
+            break;
+        case DW_LNS_set_isa:
+            /* isa = (unsigned int)*/(void)uleb128(&p);
+            break;
+        case 0:
+            a = uleb128(&p);
+            op = *p++;
+            switch (op) {
+            case DW_LNE_end_sequence:
+                /* end_sequence = 1; */
+                FILL_LINE();
+                addr = 0;
+                file = 1;
+                line = 1;
+                /* column = 0; */
+                is_stmt = header.default_is_stmt;
+                /* end_sequence = 0; */
+                /* isa = 0; */
+                break;
+            case DW_LNE_set_address:
+                addr = *(unsigned long *)p;
+                p += sizeof(unsigned long);
+                break;
+            case DW_LNE_define_file:
+                kprintf("Unsupported operation in %s\n",
+                        binary_filename);
+                break;
+            case DW_LNE_set_discriminator:
+                /* TODO:currently ignore */
+                uleb128(&p);
+                break;
+            default:
+                kprintf("Unknown extended opcode: %d in %s\n",
+                        op, binary_filename);
+            }
+            break;
+        default: {
             uint8_t adjusted_opcode = op - header.opcode_base;
             uint8_t operation_advance = adjusted_opcode / header.line_range;
             /* NOTE: this code doesn't support VLIW */
             addr += operation_advance * header.minimum_instruction_length;
             line += header.line_base + (adjusted_opcode % header.line_range);
-	    FILL_LINE();
-	}
-	}
+            FILL_LINE();
+        }
+        }
     }
     *debug_line = (char *)p;
     return 0;
@@ -500,17 +556,17 @@ parse_debug_line_cu(int num_traces, void **traces, const char **debug_line,
 
 static int
 parse_debug_line(int num_traces, void **traces,
-		 const char *debug_line, unsigned long size,
-		 obj_info_t *obj, line_info_t *lines, int offset)
+                 const char *debug_line, unsigned long size,
+                 obj_info_t *obj, line_info_t *lines, int offset, FILE *errout)
 {
     const char *debug_line_end = debug_line + size;
     while (debug_line < debug_line_end) {
-	if (parse_debug_line_cu(num_traces, traces, &debug_line, obj, lines, offset))
-	    return -1;
+        if (parse_debug_line_cu(num_traces, traces, &debug_line, obj, lines, offset, errout))
+            return -1;
     }
     if (debug_line != debug_line_end) {
-	kprintf("Unexpected size of .debug_line in %s\n",
-		binary_filename);
+        kprintf("Unexpected size of .debug_line in %s\n",
+                binary_filename);
     }
     return 0;
 }
@@ -518,7 +574,7 @@ parse_debug_line(int num_traces, void **traces,
 /* read file and fill lines */
 static uintptr_t
 fill_lines(int num_traces, void **traces, int check_debuglink,
-	   obj_info_t **objp, line_info_t *lines, int offset);
+           obj_info_t **objp, line_info_t *lines, int offset, FILE *errout);
 
 static void
 append_obj(obj_info_t **objp)
@@ -546,7 +602,7 @@ append_obj(obj_info_t **objp)
 // check the path pattern of "/usr/lib/debug/usr/bin/ruby.debug"
 static void
 follow_debuglink(const char *debuglink, int num_traces, void **traces,
-		 obj_info_t **objp, line_info_t *lines, int offset)
+                 obj_info_t **objp, line_info_t *lines, int offset, FILE *errout)
 {
     static const char global_debug_dir[] = "/usr/lib/debug";
     const size_t global_debug_dir_len = sizeof(global_debug_dir) - 1;
@@ -556,13 +612,13 @@ follow_debuglink(const char *debuglink, int num_traces, void **traces,
 
     p = strrchr(binary_filename, '/');
     if (!p) {
-	return;
+        return;
     }
     p[1] = '\0';
 
     len = strlen(binary_filename);
     if (len >= PATH_MAX - global_debug_dir_len)
-	len = PATH_MAX - global_debug_dir_len - 1;
+        len = PATH_MAX - global_debug_dir_len - 1;
     memmove(binary_filename + global_debug_dir_len, binary_filename, len);
     memcpy(binary_filename, global_debug_dir, global_debug_dir_len);
     len += global_debug_dir_len;
@@ -572,21 +628,22 @@ follow_debuglink(const char *debuglink, int num_traces, void **traces,
     o2 = *objp;
     o2->base_addr = o1->base_addr;
     o2->path = o1->path;
-    fill_lines(num_traces, traces, 0, objp, lines, offset);
+    fill_lines(num_traces, traces, 0, objp, lines, offset, errout);
 }
 
 // check the path pattern of "/usr/lib/debug/.build-id/ab/cdef1234.debug"
 static void
 follow_debuglink_build_id(const char *build_id, size_t build_id_size, int num_traces, void **traces,
-                          obj_info_t **objp, line_info_t *lines, int offset)
+                          obj_info_t **objp, line_info_t *lines, int offset, FILE *errout)
 {
     static const char global_debug_dir[] = "/usr/lib/debug/.build-id/";
+    static const char debug_suffix[] = ".debug";
     const size_t global_debug_dir_len = sizeof(global_debug_dir) - 1;
     char *p;
     obj_info_t *o1 = *objp, *o2;
     size_t i;
 
-    if (PATH_MAX < global_debug_dir_len + 1 + build_id_size * 2 + 6) return;
+    if (PATH_MAX < global_debug_dir_len + build_id_size * 2 + sizeof(debug_suffix)) return;
 
     memcpy(binary_filename, global_debug_dir, global_debug_dir_len);
     p = binary_filename + global_debug_dir_len;
@@ -597,13 +654,13 @@ follow_debuglink_build_id(const char *build_id, size_t build_id_size, int num_tr
         *p++ = tbl[n % 16];
         if (i == 0) *p++ = '/';
     }
-    strcpy(p, ".debug");
+    memcpy(p, debug_suffix, sizeof(debug_suffix));
 
     append_obj(objp);
     o2 = *objp;
     o2->base_addr = o1->base_addr;
     o2->path = o1->path;
-    fill_lines(num_traces, traces, 0, objp, lines, offset);
+    fill_lines(num_traces, traces, 0, objp, lines, offset, errout);
 }
 #endif
 
@@ -807,7 +864,11 @@ enum
     DW_FORM_addrx1 = 0x29,
     DW_FORM_addrx2 = 0x2a,
     DW_FORM_addrx3 = 0x2b,
-    DW_FORM_addrx4 = 0x2c
+    DW_FORM_addrx4 = 0x2c,
+
+    /* GNU extensions for referring to .gnu_debugaltlink dwz-compressed info */
+    DW_FORM_GNU_ref_alt = 0x1f20,
+    DW_FORM_GNU_strp_alt = 0x1f21
 };
 
 /* Range list entry encodings */
@@ -827,16 +888,23 @@ enum {
     VAL_cstr = 1,
     VAL_data = 2,
     VAL_uint = 3,
-    VAL_int = 4
+    VAL_int = 4,
+    VAL_addr = 5
 };
 
 # define ABBREV_TABLE_SIZE 256
 typedef struct {
     obj_info_t *obj;
     const char *file;
+    uint8_t current_version;
     const char *current_cu;
     uint64_t current_low_pc;
+    uint64_t current_str_offsets_base;
+    uint64_t current_addr_base;
+    uint64_t current_rnglists_base;
     const char *debug_line_cu_end;
+    uint8_t debug_line_format;
+    uint16_t debug_line_version;
     const char *debug_line_files;
     const char *debug_line_directories;
     const char *p;
@@ -861,6 +929,7 @@ typedef struct {
         const char *ptr;
         uint64_t uint64;
         int64_t int64;
+        uint64_t addr_idx;
     } as;
     uint64_t off;
     uint64_t at;
@@ -869,8 +938,11 @@ typedef struct {
     int type;
 } DebugInfoValue;
 
-/* TODO: Big Endian */
+#if defined(WORDS_BIGENDIAN)
+#define MERGE_2INTS(a,b,sz) (((uint64_t)(a)<<sz)|(b))
+#else
 #define MERGE_2INTS(a,b,sz) (((uint64_t)(b)<<sz)|(a))
+#endif
 
 static uint16_t
 get_uint16(const uint8_t *p)
@@ -973,6 +1045,9 @@ debug_info_reader_init(DebugInfoReader *reader, obj_info_t *obj)
     reader->pend = obj->debug_info.ptr + obj->debug_info.size;
     reader->debug_line_cu_end = obj->debug_line.ptr;
     reader->current_low_pc = 0;
+    reader->current_str_offsets_base = 0;
+    reader->current_addr_base = 0;
+    reader->current_rnglists_base = 0;
 }
 
 static void
@@ -1011,16 +1086,18 @@ di_read_debug_abbrev_cu(DebugInfoReader *reader)
 }
 
 static int
-di_read_debug_line_cu(DebugInfoReader *reader)
+di_read_debug_line_cu(DebugInfoReader *reader, FILE *errout)
 {
     const char *p;
     struct LineNumberProgramHeader header;
 
     p = (const char *)reader->debug_line_cu_end;
-    if (parse_debug_line_header(&p, &header))
+    if (parse_debug_line_header(reader->obj, &p, &header, errout))
         return -1;
 
     reader->debug_line_cu_end = (char *)header.cu_end;
+    reader->debug_line_format = header.format;
+    reader->debug_line_version = header.version;
     reader->debug_line_directories = (char *)header.include_directories;
     reader->debug_line_files = (char *)header.filenames;
 
@@ -1028,6 +1105,13 @@ di_read_debug_line_cu(DebugInfoReader *reader)
 }
 
 static void
+set_addr_idx_value(DebugInfoValue *v, uint64_t n)
+{
+    v->as.addr_idx = n;
+    v->type = VAL_addr;
+}
+
+static void
 set_uint_value(DebugInfoValue *v, uint64_t n)
 {
     v->as.uint64 = n;
@@ -1074,19 +1158,46 @@ get_cstr_value(DebugInfoValue *v)
     }
 }
 
-static void
-debug_info_reader_read_value(DebugInfoReader *reader, uint64_t form, DebugInfoValue *v)
+static const char *
+resolve_strx(DebugInfoReader *reader, uint64_t idx)
+{
+    const char *p = reader->obj->debug_str_offsets.ptr + reader->current_str_offsets_base;
+    uint64_t off;
+    if (reader->format == 4) {
+        off = ((uint32_t *)p)[idx];
+    }
+    else {
+        off = ((uint64_t *)p)[idx];
+    }
+    return reader->obj->debug_str.ptr + off;
+}
+
+static bool
+debug_info_reader_read_addr_value_member(DebugInfoReader *reader, DebugInfoValue *v, int size)
+{
+    if (size == 4) {
+        set_uint_value(v, read_uint32(&reader->p));
+    } else if (size == 8) {
+        set_uint_value(v, read_uint64(&reader->p));
+    } else {
+        return false;
+    }
+    return true;
+}
+
+#define debug_info_reader_read_addr_value(reader, v, mem) \
+    if (!debug_info_reader_read_addr_value_member((reader), (v), (reader)->mem)) { \
+        kprintf("unknown " #mem ":%d", (reader)->mem); \
+        return false; \
+    }
+
+
+static bool
+debug_info_reader_read_value(DebugInfoReader *reader, uint64_t form, DebugInfoValue *v, FILE *errout)
 {
     switch (form) {
       case DW_FORM_addr:
-        if (reader->address_size == 4) {
-            set_uint_value(v, read_uint32(&reader->p));
-        } else if (reader->address_size == 8) {
-            set_uint_value(v, read_uint64(&reader->p));
-        } else {
-            fprintf(stderr,"unknown address_size:%d", reader->address_size);
-            abort();
-        }
+        debug_info_reader_read_addr_value(reader, v, address_size);
         break;
       case DW_FORM_block2:
         v->size = read_uint16(&reader->p);
@@ -1138,13 +1249,12 @@ debug_info_reader_read_value(DebugInfoReader *reader, uint64_t form, DebugInfoVa
         set_uint_value(v, read_uleb128(reader));
         break;
       case DW_FORM_ref_addr:
-        if (reader->format == 4) {
-            set_uint_value(v, read_uint32(&reader->p));
-        } else if (reader->format == 8) {
-            set_uint_value(v, read_uint64(&reader->p));
+        if (reader->current_version <= 2) {
+            // DWARF Version 2 specifies that references have
+            // the same size as an address on the target system
+            debug_info_reader_read_addr_value(reader, v, address_size);
         } else {
-            fprintf(stderr,"unknown format:%d", reader->format);
-            abort();
+            debug_info_reader_read_addr_value(reader, v, format);
         }
         break;
       case DW_FORM_ref1:
@@ -1186,11 +1296,10 @@ debug_info_reader_read_value(DebugInfoReader *reader, uint64_t form, DebugInfoVa
         set_uint_value(v, 1);
         break;
       case DW_FORM_strx:
-        set_uint_value(v, uleb128(&reader->p));
+        set_cstr_value(v, resolve_strx(reader, uleb128(&reader->p)));
         break;
       case DW_FORM_addrx:
-        /* TODO: read .debug_addr */
-        set_uint_value(v, uleb128(&reader->p));
+        set_addr_idx_value(v, uleb128(&reader->p));
         break;
       case DW_FORM_ref_sup4:
         set_uint_value(v, read_uint32(&reader->p));
@@ -1205,8 +1314,7 @@ debug_info_reader_read_value(DebugInfoReader *reader, uint64_t form, DebugInfoVa
         reader->p += v->size;
         break;
       case DW_FORM_line_strp:
-        set_uint_value(v, read_uint(reader));
-        /* *p = reader->file + reader->line->sh_offset + ret; */
+        set_cstrp_value(v, reader->obj->debug_line_str.ptr, read_uint(reader));
         break;
       case DW_FORM_ref_sig8:
         set_uint_value(v, read_uint64(&reader->p));
@@ -1224,43 +1332,51 @@ debug_info_reader_read_value(DebugInfoReader *reader, uint64_t form, DebugInfoVa
         set_uint_value(v, read_uint64(&reader->p));
         break;
       case DW_FORM_strx1:
-        set_uint_value(v, read_uint8(&reader->p));
+        set_cstr_value(v, resolve_strx(reader, read_uint8(&reader->p)));
         break;
       case DW_FORM_strx2:
-        set_uint_value(v, read_uint16(&reader->p));
+        set_cstr_value(v, resolve_strx(reader, read_uint16(&reader->p)));
         break;
       case DW_FORM_strx3:
-        set_uint_value(v, read_uint24(&reader->p));
+        set_cstr_value(v, resolve_strx(reader, read_uint24(&reader->p)));
         break;
       case DW_FORM_strx4:
-        set_uint_value(v, read_uint32(&reader->p));
+        set_cstr_value(v, resolve_strx(reader, read_uint32(&reader->p)));
         break;
       case DW_FORM_addrx1:
-        set_uint_value(v, read_uint8(&reader->p));
+        set_addr_idx_value(v, read_uint8(&reader->p));
         break;
       case DW_FORM_addrx2:
-        set_uint_value(v, read_uint16(&reader->p));
+        set_addr_idx_value(v, read_uint16(&reader->p));
         break;
       case DW_FORM_addrx3:
-        set_uint_value(v, read_uint24(&reader->p));
+        set_addr_idx_value(v, read_uint24(&reader->p));
         break;
       case DW_FORM_addrx4:
-        set_uint_value(v, read_uint32(&reader->p));
+        set_addr_idx_value(v, read_uint32(&reader->p));
+        break;
+      /* we have no support for actually reading the real values of these refs out
+       * of the .gnu_debugaltlink dwz-compressed debuginfo at the moment, but "read"
+       * them anyway so that we advance the reader by the right amount. */
+      case DW_FORM_GNU_ref_alt:
+      case DW_FORM_GNU_strp_alt:
+        read_uint(reader);
+        set_uint_value(v, 0);
         break;
       case 0:
         goto fail;
         break;
     }
-    return;
+    return true;
 
   fail:
-    fprintf(stderr, "%d: unsupported form: %#"PRIx64"\n", __LINE__, form);
-    exit(1);
+    kprintf("%d: unsupported form: %#"PRIx64"\n", __LINE__, form);
+    return false;
 }
 
 /* find abbrev in current compilation unit */
 static const char *
-di_find_abbrev(DebugInfoReader *reader, uint64_t abbrev_number)
+di_find_abbrev(DebugInfoReader *reader, uint64_t abbrev_number, FILE *errout)
 {
     const char *p;
     if (abbrev_number < ABBREV_TABLE_SIZE) {
@@ -1273,8 +1389,8 @@ di_find_abbrev(DebugInfoReader *reader, uint64_t abbrev_number)
     di_skip_die_attributes(&p);
     for (uint64_t n = uleb128(&p); abbrev_number != n; n = uleb128(&p)) {
         if (n == 0) {
-            fprintf(stderr,"%d: Abbrev Number %"PRId64" not found\n",__LINE__, abbrev_number);
-            exit(1);
+            kprintf("%d: Abbrev Number %"PRId64" not found\n",__LINE__, abbrev_number);
+            return NULL;
         }
         uleb128(&p); /* tag */
         p++; /* has_children */
@@ -1285,52 +1401,52 @@ di_find_abbrev(DebugInfoReader *reader, uint64_t abbrev_number)
 
 #if 0
 static void
-hexdump0(const unsigned char *p, size_t n)
+hexdump0(const unsigned char *p, size_t n, FILE *errout)
 {
     size_t i;
-    fprintf(stderr, "     0  1  2  3  4  5  6  7  8  9  A  B  C  D  E  F\n");
+    kprintf("     0  1  2  3  4  5  6  7  8  9  A  B  C  D  E  F\n");
     for (i=0; i < n; i++){
         switch (i & 15) {
           case 0:
-            fprintf(stderr, "%02zd: %02X ", i/16, p[i]);
+            kprintf("%02" PRIdSIZE ": %02X ", i/16, p[i]);
             break;
           case 15:
-            fprintf(stderr, "%02X\n", p[i]);
+            kprintf("%02X\n", p[i]);
             break;
           default:
-            fprintf(stderr, "%02X ", p[i]);
+            kprintf("%02X ", p[i]);
             break;
         }
     }
     if ((i & 15) != 15) {
-        fprintf(stderr, "\n");
+        kprintf("\n");
     }
 }
-#define hexdump(p,n) hexdump0((const unsigned char *)p, n)
+#define hexdump(p,n,e) hexdump0((const unsigned char *)p, n, e)
 
 static void
-div_inspect(DebugInfoValue *v)
+div_inspect(DebugInfoValue *v, FILE *errout)
 {
     switch (v->type) {
       case VAL_uint:
-        fprintf(stderr,"%d: type:%d size:%zx v:%"PRIx64"\n",__LINE__,v->type,v->size,v->as.uint64);
+        kprintf("%d: type:%d size:%" PRIxSIZE " v:%"PRIx64"\n",__LINE__,v->type,v->size,v->as.uint64);
         break;
       case VAL_int:
-        fprintf(stderr,"%d: type:%d size:%zx v:%"PRId64"\n",__LINE__,v->type,v->size,(int64_t)v->as.uint64);
+        kprintf("%d: type:%d size:%" PRIxSIZE " v:%"PRId64"\n",__LINE__,v->type,v->size,(int64_t)v->as.uint64);
         break;
       case VAL_cstr:
-        fprintf(stderr,"%d: type:%d size:%zx v:'%s'\n",__LINE__,v->type,v->size,v->as.ptr);
+        kprintf("%d: type:%d size:%" PRIxSIZE " v:'%s'\n",__LINE__,v->type,v->size,v->as.ptr);
         break;
       case VAL_data:
-        fprintf(stderr,"%d: type:%d size:%zx v:\n",__LINE__,v->type,v->size);
-        hexdump(v->as.ptr, 16);
+        kprintf("%d: type:%d size:%" PRIxSIZE " v:\n",__LINE__,v->type,v->size);
+        hexdump(v->as.ptr, 16, errout);
         break;
     }
 }
 #endif
 
 static DIE *
-di_read_die(DebugInfoReader *reader, DIE *die)
+di_read_die(DebugInfoReader *reader, DIE *die, FILE *errout)
 {
     uint64_t abbrev_number = uleb128(&reader->p);
     if (abbrev_number == 0) {
@@ -1338,7 +1454,7 @@ di_read_die(DebugInfoReader *reader, DIE *die)
         return NULL;
     }
 
-    reader->q = di_find_abbrev(reader, abbrev_number);
+    if (!(reader->q = di_find_abbrev(reader, abbrev_number, errout))) return NULL;
 
     die->pos = reader->p - reader->obj->debug_info.ptr - 1;
     die->tag = (int)uleb128(&reader->q); /* tag */
@@ -1350,27 +1466,109 @@ di_read_die(DebugInfoReader *reader, DIE *die)
 }
 
 static DebugInfoValue *
-di_read_record(DebugInfoReader *reader, DebugInfoValue *vp)
+di_read_record(DebugInfoReader *reader, DebugInfoValue *vp, FILE *errout)
 {
     uint64_t at = uleb128(&reader->q);
     uint64_t form = uleb128(&reader->q);
     if (!at || !form) return NULL;
     vp->at = at;
     vp->form = form;
-    debug_info_reader_read_value(reader, form, vp);
+    if (!debug_info_reader_read_value(reader, form, vp, errout)) return NULL;
     return vp;
 }
 
-static void
-di_skip_records(DebugInfoReader *reader)
+static bool
+di_skip_records(DebugInfoReader *reader, FILE *errout)
 {
     for (;;) {
-        DebugInfoValue v = {{}};
+        DebugInfoValue v = {{0}};
         uint64_t at = uleb128(&reader->q);
         uint64_t form = uleb128(&reader->q);
-        if (!at || !form) return;
-        debug_info_reader_read_value(reader, form, &v);
+        if (!at || !form) return true;
+        if (!debug_info_reader_read_value(reader, form, &v, errout)) return false;
+    }
+}
+
+typedef struct addr_header {
+    const char *ptr;
+    uint64_t unit_length;
+    uint8_t format;
+    uint8_t address_size;
+    /* uint8_t segment_selector_size; */
+} addr_header_t;
+
+static bool
+addr_header_init(obj_info_t *obj, addr_header_t *header, FILE *errout)
+{
+    const char *p = obj->debug_addr.ptr;
+
+    header->ptr = p;
+
+    if (!p) return true;
+
+    header->unit_length = *(uint32_t *)p;
+    p += sizeof(uint32_t);
+
+    header->format = 4;
+    if (header->unit_length == 0xffffffff) {
+        header->unit_length = *(uint64_t *)p;
+        p += sizeof(uint64_t);
+        header->format = 8;
+    }
+
+    p += 2; /* version */
+    header->address_size = *p++;
+    if (header->address_size != 4 && header->address_size != 8) {
+        kprintf("unknown address_size:%d", header->address_size);
+        return false;
     }
+    p++; /* segment_selector_size */
+    return true;
+}
+
+static uint64_t
+read_addr(addr_header_t *header, uint64_t addr_base, uint64_t idx) {
+    if (header->address_size == 4) {
+        return ((uint32_t*)(header->ptr + addr_base))[idx];
+    }
+    else {
+        return ((uint64_t*)(header->ptr + addr_base))[idx];
+    }
+}
+
+typedef struct rnglists_header {
+    uint64_t unit_length;
+    uint8_t format;
+    uint8_t address_size;
+    uint32_t offset_entry_count;
+} rnglists_header_t;
+
+static bool
+rnglists_header_init(obj_info_t *obj, rnglists_header_t *header, FILE *errout)
+{
+    const char *p = obj->debug_rnglists.ptr;
+
+    if (!p) return true;
+
+    header->unit_length = *(uint32_t *)p;
+    p += sizeof(uint32_t);
+
+    header->format = 4;
+    if (header->unit_length == 0xffffffff) {
+        header->unit_length = *(uint64_t *)p;
+        p += sizeof(uint64_t);
+        header->format = 8;
+    }
+
+    p += 2; /* version */
+    header->address_size = *p++;
+    if (header->address_size != 4 && header->address_size != 8) {
+        kprintf("unknown address_size:%d", header->address_size);
+        return false;
+    }
+    p++; /* segment_selector_size */
+    header->offset_entry_count = *(uint32_t *)p;
+    return true;
 }
 
 typedef struct {
@@ -1383,50 +1581,54 @@ typedef struct {
 } ranges_t;
 
 static void
-ranges_set(ranges_t *ptr, DebugInfoValue *v)
+ranges_set(ranges_t *ptr, DebugInfoValue *v, addr_header_t *addr_header, uint64_t addr_base)
 {
+    uint64_t n = 0;
+    if (v->type == VAL_uint) {
+        n = v->as.uint64;
+    }
+    else if (v->type == VAL_addr) {
+        n = read_addr(addr_header, addr_base, v->as.addr_idx);
+    }
     switch (v->at) {
       case DW_AT_low_pc:
-        ptr->low_pc = v->as.uint64;
+        ptr->low_pc = n;
         ptr->low_pc_set = true;
         break;
       case DW_AT_high_pc:
         if (v->form == DW_FORM_addr) {
-            ptr->high_pc = v->as.uint64;
+            ptr->high_pc = n;
         }
         else {
-            ptr->high_pc = ptr->low_pc + v->as.uint64;
+            ptr->high_pc = ptr->low_pc + n;
         }
         ptr->high_pc_set = true;
         break;
       case DW_AT_ranges:
-        ptr->ranges = v->as.uint64;
+        ptr->ranges = n;
         ptr->ranges_set = true;
         break;
     }
 }
 
 static uint64_t
-read_dw_form_addr(DebugInfoReader *reader, const char **ptr)
+read_dw_form_addr(DebugInfoReader *reader, const char **ptr, FILE *errout)
 {
     const char *p = *ptr;
     *ptr = p + reader->address_size;
     if (reader->address_size == 4) {
         return read_uint32(&p);
-    } else if (reader->address_size == 8) {
-        return read_uint64(&p);
     } else {
-        fprintf(stderr,"unknown address_size:%d", reader->address_size);
-        abort();
+        return read_uint64(&p);
     }
 }
 
 static uintptr_t
-ranges_include(DebugInfoReader *reader, ranges_t *ptr, uint64_t addr)
+ranges_include(DebugInfoReader *reader, ranges_t *ptr, uint64_t addr, rnglists_header_t *rnglists_header, FILE *errout)
 {
     if (ptr->high_pc_set) {
         if (ptr->ranges_set || !ptr->low_pc_set) {
-            exit(1);
+            return UINTPTR_MAX;
         }
         if (ptr->low_pc <= addr && addr <= ptr->high_pc) {
             return (uintptr_t)ptr->low_pc;
@@ -1437,8 +1639,21 @@ ranges_include(DebugInfoReader *reader, ranges_t *ptr, uint64_t addr)
         const char *p;
         uint64_t base = ptr->low_pc_set ? ptr->low_pc : reader->current_low_pc;
         bool base_valid = true;
-        if (reader->obj->debug_rnglists.ptr) {
-            p = reader->obj->debug_rnglists.ptr + ptr->ranges;
+        if (reader->current_version >= 5) {
+            if (rnglists_header->offset_entry_count == 0) {
+                // DW_FORM_sec_offset
+                p = reader->obj->debug_rnglists.ptr + ptr->ranges + reader->current_rnglists_base;
+            }
+            else {
+                // DW_FORM_rnglistx
+                const char *offset_array = reader->obj->debug_rnglists.ptr + reader->current_rnglists_base;
+                if (rnglists_header->format == 4) {
+                    p = offset_array + ((uint32_t *)offset_array)[ptr->ranges];
+                }
+                else {
+                    p = offset_array + ((uint64_t *)offset_array)[ptr->ranges];
+                }
+            }
             for (;;) {
                 uint8_t rle = read_uint8(&p);
                 uintptr_t from = 0, to = 0;
@@ -1462,15 +1677,15 @@ ranges_include(DebugInfoReader *reader, ranges_t *ptr, uint64_t addr)
                     to = (uintptr_t)base + uleb128(&p);
                     break;
                   case DW_RLE_base_address:
-                    base = read_dw_form_addr(reader, &p);
+                    base = read_dw_form_addr(reader, &p, errout);
                     base_valid = true;
                     break;
                   case DW_RLE_start_end:
-                    from = (uintptr_t)read_dw_form_addr(reader, &p);
-                    to = (uintptr_t)read_dw_form_addr(reader, &p);
+                    from = (uintptr_t)read_dw_form_addr(reader, &p, errout);
+                    to = (uintptr_t)read_dw_form_addr(reader, &p, errout);
                     break;
                   case DW_RLE_start_length:
-                    from = (uintptr_t)read_dw_form_addr(reader, &p);
+                    from = (uintptr_t)read_dw_form_addr(reader, &p, errout);
                     to = from + uleb128(&p);
                     break;
                 }
@@ -1478,7 +1693,7 @@ ranges_include(DebugInfoReader *reader, ranges_t *ptr, uint64_t addr)
                     return from;
                 }
             }
-            return false;
+            return 0;
         }
         p = reader->obj->debug_ranges.ptr + ptr->ranges;
         for (;;) {
@@ -1499,42 +1714,42 @@ ranges_include(DebugInfoReader *reader, ranges_t *ptr, uint64_t addr)
             return (uintptr_t)ptr->low_pc;
         }
     }
-    return false;
+    return 0;
 }
 
 #if 0
 static void
-ranges_inspect(DebugInfoReader *reader, ranges_t *ptr)
+ranges_inspect(DebugInfoReader *reader, ranges_t *ptr, FILE *errout)
 {
     if (ptr->high_pc_set) {
         if (ptr->ranges_set || !ptr->low_pc_set) {
-            fprintf(stderr,"low_pc_set:%d high_pc_set:%d ranges_set:%d\n",ptr->low_pc_set,ptr->high_pc_set,ptr->ranges_set);
-            exit(1);
+            kprintf("low_pc_set:%d high_pc_set:%d ranges_set:%d\n",ptr->low_pc_set,ptr->high_pc_set,ptr->ranges_set);
+            return;
         }
-        fprintf(stderr,"low_pc:%"PRIx64" high_pc:%"PRIx64"\n",ptr->low_pc,ptr->high_pc);
+        kprintf("low_pc:%"PRIx64" high_pc:%"PRIx64"\n",ptr->low_pc,ptr->high_pc);
     }
     else if (ptr->ranges_set) {
         char *p = reader->obj->debug_ranges.ptr + ptr->ranges;
-        fprintf(stderr,"low_pc:%"PRIx64" ranges:%"PRIx64" %lx ",ptr->low_pc,ptr->ranges, p-reader->obj->mapped);
+        kprintf("low_pc:%"PRIx64" ranges:%"PRIx64" %lx ",ptr->low_pc,ptr->ranges, p-reader->obj->mapped);
         for (;;) {
             uintptr_t from = read_uintptr(&p);
             uintptr_t to = read_uintptr(&p);
             if (!from && !to) break;
-            fprintf(stderr,"%"PRIx64"-%"PRIx64" ",ptr->low_pc+from,ptr->low_pc+to);
+            kprintf("%"PRIx64"-%"PRIx64" ",ptr->low_pc+from,ptr->low_pc+to);
         }
-        fprintf(stderr,"\n");
+        kprintf("\n");
     }
     else if (ptr->low_pc_set) {
-        fprintf(stderr,"low_pc:%"PRIx64"\n",ptr->low_pc);
+        kprintf("low_pc:%"PRIx64"\n",ptr->low_pc);
     }
     else {
-        fprintf(stderr,"empty\n");
+        kprintf("empty\n");
     }
 }
 #endif
 
 static int
-di_read_cu(DebugInfoReader *reader)
+di_read_cu(DebugInfoReader *reader, FILE *errout)
 {
     uint64_t unit_length;
     uint16_t version;
@@ -1548,6 +1763,7 @@ di_read_cu(DebugInfoReader *reader)
     }
     reader->cu_end = reader->p + unit_length;
     version = read_uint16(&reader->p);
+    reader->current_version = version;
     if (version > 5) {
         return -1;
     }
@@ -1560,43 +1776,72 @@ di_read_cu(DebugInfoReader *reader)
         debug_abbrev_offset = read_uint(reader);
         reader->address_size = read_uint8(&reader->p);
     }
+    if (reader->address_size != 4 && reader->address_size != 8) {
+        kprintf("unknown address_size:%d", reader->address_size);
+        return -1;
+    }
     reader->q0 = reader->obj->debug_abbrev.ptr + debug_abbrev_offset;
 
     reader->level = 0;
     di_read_debug_abbrev_cu(reader);
-    if (di_read_debug_line_cu(reader)) return -1;
+    if (di_read_debug_line_cu(reader, errout)) return -1;
 
-#if defined(__GNUC__) && !defined(__clang__) && !defined(__INTEL_COMPILER_BUILD_DATE)
-    /* Though DWARF specifies "the applicable base address defaults to the base
-       address of the compilation unit", but GCC seems to use zero as default */
-#else
     do {
         DIE die;
 
-        if (!di_read_die(reader, &die)) continue;
+        if (!di_read_die(reader, &die, errout)) continue;
 
         if (die.tag != DW_TAG_compile_unit) {
-            di_skip_records(reader);
+            if (!di_skip_records(reader, errout)) return -1;
             break;
         }
 
+        reader->current_str_offsets_base = 0;
+        reader->current_addr_base = 0;
+        reader->current_rnglists_base = 0;
+
+        DebugInfoValue low_pc = {{0}};
         /* enumerate abbrev */
         for (;;) {
-            DebugInfoValue v = {{}};
-            if (!di_read_record(reader, &v)) break;
+            DebugInfoValue v = {{0}};
+            if (!di_read_record(reader, &v, errout)) break;
             switch (v.at) {
               case DW_AT_low_pc:
-                reader->current_low_pc = v.as.uint64;
+                // clang may output DW_AT_addr_base after DW_AT_low_pc.
+                // We need to resolve the DW_FORM_addr* after DW_AT_addr_base is parsed.
+                low_pc = v;
+                break;
+              case DW_AT_str_offsets_base:
+                reader->current_str_offsets_base = v.as.uint64;
+                break;
+              case DW_AT_addr_base:
+                reader->current_addr_base = v.as.uint64;
+                break;
+              case DW_AT_rnglists_base:
+                reader->current_rnglists_base = v.as.uint64;
                 break;
             }
         }
+        // Resolve the DW_FORM_addr of DW_AT_low_pc
+        switch (low_pc.type) {
+            case VAL_uint:
+                reader->current_low_pc = low_pc.as.uint64;
+                break;
+            case VAL_addr:
+                {
+                    addr_header_t header = {0};
+                    if (!addr_header_init(reader->obj, &header, errout)) return -1;
+                    reader->current_low_pc = read_addr(&header, reader->current_addr_base, low_pc.as.addr_idx);
+                }
+                break;
+        }
     } while (0);
-#endif
+
     return 0;
 }
 
 static void
-read_abstract_origin(DebugInfoReader *reader, uint64_t form, uint64_t abstract_origin, line_info_t *line)
+read_abstract_origin(DebugInfoReader *reader, uint64_t form, uint64_t abstract_origin, line_info_t *line, FILE *errout)
 {
     const char *p = reader->p;
     const char *q = reader->q;
@@ -1621,12 +1866,12 @@ read_abstract_origin(DebugInfoReader *reader, uint64_t form, uint64_t abstract_o
       default:
         goto finish;
     }
-    if (!di_read_die(reader, &die)) goto finish;
+    if (!di_read_die(reader, &die, errout)) goto finish;
 
     /* enumerate abbrev */
     for (;;) {
-        DebugInfoValue v = {{}};
-        if (!di_read_record(reader, &v)) break;
+        DebugInfoValue v = {{0}};
+        if (!di_read_record(reader, &v, errout)) break;
         switch (v.at) {
           case DW_AT_name:
             line->sname = get_cstr_value(&v);
@@ -1640,36 +1885,44 @@ read_abstract_origin(DebugInfoReader *reader, uint64_t form, uint64_t abstract_o
     reader->level = level;
 }
 
-static void
+static bool
 debug_info_read(DebugInfoReader *reader, int num_traces, void **traces,
-         line_info_t *lines, int offset) {
+                line_info_t *lines, int offset, FILE *errout)
+{
+
+    addr_header_t addr_header = {0};
+    if (!addr_header_init(reader->obj, &addr_header, errout)) return false;
+
+    rnglists_header_t rnglists_header = {0};
+    if (!rnglists_header_init(reader->obj, &rnglists_header, errout)) return false;
+
     while (reader->p < reader->cu_end) {
         DIE die;
-        ranges_t ranges = {};
-        line_info_t line = {};
+        ranges_t ranges = {0};
+        line_info_t line = {0};
 
-        if (!di_read_die(reader, &die)) continue;
-        /* fprintf(stderr,"%d:%tx: <%d>\n",__LINE__,die.pos,reader->level,die.tag); */
+        if (!di_read_die(reader, &die, errout)) continue;
+        /* kprintf("%d:%tx: <%d>\n",__LINE__,die.pos,reader->level,die.tag); */
 
         if (die.tag != DW_TAG_subprogram && die.tag != DW_TAG_inlined_subroutine) {
           skip_die:
-            di_skip_records(reader);
+            if (!di_skip_records(reader, errout)) return false;
             continue;
         }
 
         /* enumerate abbrev */
         for (;;) {
-            DebugInfoValue v = {{}};
+            DebugInfoValue v = {{0}};
             /* ptrdiff_t pos = reader->p - reader->p0; */
-            if (!di_read_record(reader, &v)) break;
-            /* fprintf(stderr,"\n%d:%tx: AT:%lx FORM:%lx\n",__LINE__,pos,v.at,v.form); */
-            /* div_inspect(&v); */
+            if (!di_read_record(reader, &v, errout)) break;
+            /* kprintf("\n%d:%tx: AT:%lx FORM:%lx\n",__LINE__,pos,v.at,v.form); */
+            /* div_inspect(&v, errout); */
             switch (v.at) {
               case DW_AT_name:
                 line.sname = get_cstr_value(&v);
                 break;
               case DW_AT_call_file:
-                fill_filename((int)v.as.uint64, reader->debug_line_directories, reader->debug_line_files, &line, reader->obj);
+                fill_filename((int)v.as.uint64, reader->debug_line_format, reader->debug_line_version, reader->debug_line_directories, reader->debug_line_files, &line, reader->obj, errout);
                 break;
               case DW_AT_call_line:
                 line.line = (int)v.as.uint64;
@@ -1677,7 +1930,7 @@ debug_info_read(DebugInfoReader *reader, int num_traces, void **traces,
               case DW_AT_low_pc:
               case DW_AT_high_pc:
               case DW_AT_ranges:
-                ranges_set(&ranges, &v);
+                ranges_set(&ranges, &v, &addr_header, reader->current_addr_base);
                 break;
               case DW_AT_declaration:
                 goto skip_die;
@@ -1685,18 +1938,19 @@ debug_info_read(DebugInfoReader *reader, int num_traces, void **traces,
                 /* 1 or 3 */
                 break; /* goto skip_die; */
               case DW_AT_abstract_origin:
-                read_abstract_origin(reader, v.form, v.as.uint64, &line);
+                read_abstract_origin(reader, v.form, v.as.uint64, &line, errout);
                 break; /* goto skip_die; */
             }
         }
-        /* ranges_inspect(reader, &ranges); */
-        /* fprintf(stderr,"%d:%tx: %x ",__LINE__,diepos,die.tag); */
+        /* ranges_inspect(reader, &ranges, errout); */
+        /* kprintf("%d:%tx: %x ",__LINE__,diepos,die.tag); */
         for (int i=offset; i < num_traces; i++) {
             uintptr_t addr = (uintptr_t)traces[i];
             uintptr_t offset = addr - reader->obj->base_addr + reader->obj->vmaddr;
-            uintptr_t saddr = ranges_include(reader, &ranges, offset);
+            uintptr_t saddr = ranges_include(reader, &ranges, offset, &rnglists_header, errout);
+            if (saddr == UINTPTR_MAX) return false;
             if (saddr) {
-                /* fprintf(stderr, "%d:%tx: %d %lx->%lx %x %s: %s/%s %d %s %s %s\n",__LINE__,die.pos, i,addr,offset, die.tag,line.sname,line.dirname,line.filename,line.line,reader->obj->path,line.sname,lines[i].sname); */
+                /* kprintf("%d:%tx: %d %lx->%lx %x %s: %s/%s %d %s %s %s\n",__LINE__,die.pos, i,addr,offset, die.tag,line.sname,line.dirname,line.filename,line.line,reader->obj->path,line.sname,lines[i].sname); */
                 if (lines[i].sname) {
                     line_info_t *lp = malloc(sizeof(line_info_t));
                     memcpy(lp, &lines[i], sizeof(line_info_t));
@@ -1713,6 +1967,58 @@ debug_info_read(DebugInfoReader *reader, int num_traces, void **traces,
             }
         }
     }
+    return true;
+}
+
+// This function parses the following attributes of Line Number Program Header in DWARF 5:
+//
+// * directory_entry_format_count
+// * directory_entry_format
+// * directories_count
+// * directories
+//
+// or
+//
+// * file_name_entry_format_count
+// * file_name_entry_format
+// * file_names_count
+// * file_names
+//
+// It records DW_LNCT_path and DW_LNCT_directory_index at the index "idx".
+static const char *
+parse_ver5_debug_line_header(const char *p, int idx, uint8_t format,
+                             obj_info_t *obj, const char **out_path,
+                             uint64_t *out_directory_index, FILE *errout)
+{
+    int i, j;
+    int entry_format_count = *(uint8_t *)p++;
+    const char *entry_format = p;
+
+    /* skip the part of entry_format */
+    for (i = 0; i < entry_format_count * 2; i++) uleb128(&p);
+
+    int entry_count = (int)uleb128(&p);
+
+    DebugInfoReader reader = {0};
+    debug_info_reader_init(&reader, obj);
+    reader.format = format;
+    reader.p = p;
+    for (j = 0; j < entry_count; j++) {
+        const char *format = entry_format;
+        for (i = 0; i < entry_format_count; i++) {
+            DebugInfoValue v = {{0}};
+            unsigned long dw_lnct = uleb128(&format);
+            unsigned long dw_form = uleb128(&format);
+            if (!debug_info_reader_read_value(&reader, dw_form, &v, errout)) return 0;
+            if (dw_lnct == 1 /* DW_LNCT_path */ && v.type == VAL_cstr && out_path)
+                *out_path = v.as.ptr + v.off;
+            if (dw_lnct == 2 /* DW_LNCT_directory_index */ && v.type == VAL_uint && out_directory_index)
+                *out_directory_index = v.as.uint64;
+        }
+        if (j == idx) return 0;
+    }
+
+    return reader.p;
 }
 
 #ifdef USE_ELF
@@ -1726,14 +2032,14 @@ uncompress_debug_section(ElfW(Shdr) *shdr, char *file, char **ptr)
     int ret = 0;
 
     if (chdr->ch_type != ELFCOMPRESS_ZLIB) {
-	/* unsupported compression type */
-	return 0;
+        /* unsupported compression type */
+        return 0;
     }
 
     *ptr = malloc(destsize);
     if (!*ptr) return 0;
     ret = uncompress((Bytef *)*ptr, &destsize,
-	    (const Bytef*)chdr + sizeof(ElfW(Chdr)),
+            (const Bytef*)chdr + sizeof(ElfW(Chdr)),
             shdr->sh_size - sizeof(ElfW(Chdr)));
     if (ret != Z_OK) goto fail;
     return destsize;
@@ -1748,7 +2054,7 @@ fail:
 /* read file and fill lines */
 static uintptr_t
 fill_lines(int num_traces, void **traces, int check_debuglink,
-	   obj_info_t **objp, line_info_t *lines, int offset)
+           obj_info_t **objp, line_info_t *lines, int offset, FILE *errout)
 {
     int i, j;
     char *shstr;
@@ -1766,40 +2072,40 @@ fill_lines(int num_traces, void **traces, int check_debuglink,
 
     fd = open(binary_filename, O_RDONLY);
     if (fd < 0) {
-	goto fail;
+        goto fail;
     }
     filesize = lseek(fd, 0, SEEK_END);
     if (filesize < 0) {
-	int e = errno;
-	close(fd);
-	kprintf("lseek: %s\n", strerror(e));
-	goto fail;
+        int e = errno;
+        close(fd);
+        kprintf("lseek: %s\n", strerror(e));
+        goto fail;
     }
 #if SIZEOF_OFF_T > SIZEOF_SIZE_T
     if (filesize > (off_t)SIZE_MAX) {
-	close(fd);
-	kprintf("Too large file %s\n", binary_filename);
-	goto fail;
+        close(fd);
+        kprintf("Too large file %s\n", binary_filename);
+        goto fail;
     }
 #endif
     lseek(fd, 0, SEEK_SET);
     /* async-signal unsafe */
     file = (char *)mmap(NULL, (size_t)filesize, PROT_READ, MAP_SHARED, fd, 0);
     if (file == MAP_FAILED) {
-	int e = errno;
-	close(fd);
-	kprintf("mmap: %s\n", strerror(e));
-	goto fail;
+        int e = errno;
+        close(fd);
+        kprintf("mmap: %s\n", strerror(e));
+        goto fail;
     }
     close(fd);
 
     ehdr = (ElfW(Ehdr) *)file;
     if (memcmp(ehdr->e_ident, "\177ELF", 4) != 0) {
-	/*
-	 * Huh? Maybe filename was overridden by setproctitle() and
-	 * it match non-elf file.
-	 */
-	goto fail;
+        /*
+         * Huh? Maybe filename was overridden by setproctitle() and
+         * it match non-elf file.
+         */
+        goto fail;
     }
     obj->mapped = file;
     obj->mapped_size = (size_t)filesize;
@@ -1811,40 +2117,43 @@ fill_lines(int num_traces, void **traces, int check_debuglink,
 
     for (i = 0; i < ehdr->e_shnum; i++) {
         char *section_name = shstr + shdr[i].sh_name;
-	switch (shdr[i].sh_type) {
-	  case SHT_STRTAB:
-	    if (!strcmp(section_name, ".strtab")) {
-		strtab_shdr = shdr + i;
-	    }
-	    else if (!strcmp(section_name, ".dynstr")) {
-		dynstr_shdr = shdr + i;
-	    }
-	    break;
-	  case SHT_SYMTAB:
-	    /* if (!strcmp(section_name, ".symtab")) */
-	    symtab_shdr = shdr + i;
-	    break;
-	  case SHT_DYNSYM:
-	    /* if (!strcmp(section_name, ".dynsym")) */
-	    dynsym_shdr = shdr + i;
-	    break;
+        switch (shdr[i].sh_type) {
+          case SHT_STRTAB:
+            if (!strcmp(section_name, ".strtab")) {
+                strtab_shdr = shdr + i;
+            }
+            else if (!strcmp(section_name, ".dynstr")) {
+                dynstr_shdr = shdr + i;
+            }
+            break;
+          case SHT_SYMTAB:
+            /* if (!strcmp(section_name, ".symtab")) */
+            symtab_shdr = shdr + i;
+            break;
+          case SHT_DYNSYM:
+            /* if (!strcmp(section_name, ".dynsym")) */
+            dynsym_shdr = shdr + i;
+            break;
           case SHT_NOTE:
             if (!strcmp(section_name, ".note.gnu.build-id")) {
                 note_gnu_build_id = shdr + i;
             }
             break;
-	  case SHT_PROGBITS:
-	    if (!strcmp(section_name, ".gnu_debuglink")) {
-		gnu_debuglink_shdr = shdr + i;
-	    }
+          case SHT_PROGBITS:
+            if (!strcmp(section_name, ".gnu_debuglink")) {
+                gnu_debuglink_shdr = shdr + i;
+            }
             else {
                 const char *debug_section_names[] = {
                     ".debug_abbrev",
                     ".debug_info",
                     ".debug_line",
                     ".debug_ranges",
+                    ".debug_str_offsets",
+                    ".debug_addr",
                     ".debug_rnglists",
-                    ".debug_str"
+                    ".debug_str",
+                    ".debug_line_str"
                 };
 
                 for (j=0; j < DWARF_SECTION_COUNT; j++) {
@@ -1863,17 +2172,16 @@ fill_lines(int num_traces, void **traces, int check_debuglink,
                     break;
                 }
             }
-	    break;
-	}
+            break;
+        }
     }
 
-    if (offset == -1) {
-	/* main executable */
-	offset = 0;
-	if (dynsym_shdr && dynstr_shdr) {
-	    char *strtab = file + dynstr_shdr->sh_offset;
-	    ElfW(Sym) *symtab = (ElfW(Sym) *)(file + dynsym_shdr->sh_offset);
-	    int symtab_count = (int)(dynsym_shdr->sh_size / sizeof(ElfW(Sym)));
+    if (offset == 0) {
+        /* main executable */
+        if (dynsym_shdr && dynstr_shdr) {
+            char *strtab = file + dynstr_shdr->sh_offset;
+            ElfW(Sym) *symtab = (ElfW(Sym) *)(file + dynsym_shdr->sh_offset);
+            int symtab_count = (int)(dynsym_shdr->sh_size / sizeof(ElfW(Sym)));
             void *handle = dlopen(NULL, RTLD_NOW|RTLD_LOCAL);
             if (handle) {
                 for (j = 0; j < symtab_count; j++) {
@@ -1890,14 +2198,14 @@ fill_lines(int num_traces, void **traces, int check_debuglink,
                 }
                 dlclose(handle);
             }
-	    if (ehdr->e_type == ET_EXEC) {
-		obj->base_addr = 0;
-	    }
-	    else {
-		/* PIE (position-independent executable) */
-		obj->base_addr = dladdr_fbase;
-	    }
-	}
+            if (ehdr->e_type == ET_EXEC) {
+                obj->base_addr = 0;
+            }
+            else {
+                /* PIE (position-independent executable) */
+                obj->base_addr = dladdr_fbase;
+            }
+        }
     }
 
     if (obj->debug_info.ptr && obj->debug_abbrev.ptr) {
@@ -1905,9 +2213,10 @@ fill_lines(int num_traces, void **traces, int check_debuglink,
         debug_info_reader_init(&reader, obj);
         i = 0;
         while (reader.p < reader.pend) {
-            /* fprintf(stderr, "%d:%tx: CU[%d]\n", __LINE__, reader.p - reader.obj->debug_info.ptr, i++); */
-            if (di_read_cu(&reader)) goto use_symtab;
-            debug_info_read(&reader, num_traces, traces, lines, offset);
+            /* kprintf("%d:%tx: CU[%d]\n", __LINE__, reader.p - reader.obj->debug_info.ptr, i++); */
+            if (di_read_cu(&reader, errout)) goto use_symtab;
+            if (!debug_info_read(&reader, num_traces, traces, lines, offset, errout))
+                goto use_symtab;
         }
     }
     else {
@@ -1942,27 +2251,27 @@ use_symtab:
     }
 
     if (!obj->debug_line.ptr) {
-	/* This file doesn't have .debug_line section,
-	   let's check .gnu_debuglink section instead. */
-	if (gnu_debuglink_shdr && check_debuglink) {
-	    follow_debuglink(file + gnu_debuglink_shdr->sh_offset,
-			     num_traces, traces,
-			     objp, lines, offset);
-	}
+        /* This file doesn't have .debug_line section,
+           let's check .gnu_debuglink section instead. */
+        if (gnu_debuglink_shdr && check_debuglink) {
+            follow_debuglink(file + gnu_debuglink_shdr->sh_offset,
+                             num_traces, traces,
+                             objp, lines, offset, errout);
+        }
         if (note_gnu_build_id && check_debuglink) {
             ElfW(Nhdr) *nhdr = (ElfW(Nhdr)*) (file + note_gnu_build_id->sh_offset);
             const char *build_id = (char *)(nhdr + 1) + nhdr->n_namesz;
             follow_debuglink_build_id(build_id, nhdr->n_descsz,
-			       num_traces, traces,
-			       objp, lines, offset);
+                               num_traces, traces,
+                               objp, lines, offset, errout);
         }
-	goto finish;
+        goto finish;
     }
 
     if (parse_debug_line(num_traces, traces,
             obj->debug_line.ptr,
             obj->debug_line.size,
-            obj, lines, offset) == -1)
+            obj, lines, offset, errout) == -1)
         goto fail;
 
 finish:
@@ -1974,7 +2283,7 @@ fail:
 /* read file and fill lines */
 static uintptr_t
 fill_lines(int num_traces, void **traces, int check_debuglink,
-        obj_info_t **objp, line_info_t *lines, int offset)
+        obj_info_t **objp, line_info_t *lines, int offset, FILE *errout)
 {
 # ifdef __LP64__
 #  define LP(x) x##_64
@@ -2053,13 +2362,13 @@ fill_lines(int num_traces, void **traces, int check_debuglink,
         struct fat_header *fat = (struct fat_header *)file;
         char *q = file + sizeof(*fat);
         uint32_t nfat_arch = __builtin_bswap32(fat->nfat_arch);
-        /* fprintf(stderr,"%d: fat:%s %d\n",__LINE__, binary_filename,nfat_arch); */
+        /* kprintf("%d: fat:%s %d\n",__LINE__, binary_filename,nfat_arch); */
         for (uint32_t i = 0; i < nfat_arch; i++) {
             struct fat_arch *arch = (struct fat_arch *)q;
             cpu_type_t cputype = __builtin_bswap32(arch->cputype);
             cpu_subtype_t cpusubtype = __builtin_bswap32(arch->cpusubtype);
             uint32_t offset = __builtin_bswap32(arch->offset);
-            /* fprintf(stderr,"%d: fat %d %x/%x %x/%x\n",__LINE__, i, mhp->cputype,mhp->cpusubtype, cputype,cpusubtype); */
+            /* kprintf("%d: fat %d %x/%x %x/%x\n",__LINE__, i, mhp->cputype,mhp->cpusubtype, cputype,cpusubtype); */
             if (mhp->cputype == cputype &&
                     (cpu_subtype_t)(mhp->cpusubtype & ~CPU_SUBTYPE_MASK) == cpusubtype) {
                 p = file + offset;
@@ -2077,13 +2386,14 @@ fill_lines(int num_traces, void **traces, int check_debuglink,
         goto fail;
     }
     else {
-        kprintf("'%s' is not a "
 # ifdef __LP64__
-                "64"
+#   define bitsize "64"
 # else
-                "32"
+#   define bitsize "32"
 # endif
+        kprintf("'%s' is not a " bitsize
                 "-bit Mach-O file!\n",binary_filename);
+# undef bitsize
         close(fd);
         goto fail;
     }
@@ -2100,8 +2410,11 @@ found_mach_header:
                     "__debug_info",
                     "__debug_line",
                     "__debug_ranges",
+                    "__debug_str_offsets",
+                    "__debug_addr",
                     "__debug_rnglists",
-                    "__debug_str"
+                    "__debug_str",
+                    "__debug_line_str",
                 };
                 struct LP(segment_command) *scmd = (struct LP(segment_command) *)lcmd;
                 if (strcmp(scmd->segname, "__TEXT") == 0) {
@@ -2115,7 +2428,17 @@ found_mach_header:
                         for (int j=0; j < DWARF_SECTION_COUNT; j++) {
                             struct dwarf_section *s = obj_dwarf_section_at(obj, j);
 
-                            if (strcmp(sect->sectname, debug_section_names[j]) != 0)
+                            if (strcmp(sect->sectname, debug_section_names[j]) != 0
+#ifdef __APPLE__
+                                    /* macOS clang 16 generates DWARF5, which have Mach-O
+                                     * section names that are limited to 16 characters,
+                                     * which causes sections with long names to be truncated
+                                     * and not match above.
+                                     * See: https://wiki.dwarfstd.org/Best_Practices.md#Mach-2d-O
+                                     */
+                                    && strncmp(sect->sectname, debug_section_names[j], 16) != 0
+#endif
+                                )
                                 continue;
 
                             s->ptr = file + sect->offset;
@@ -2172,15 +2495,16 @@ found_mach_header:
         DebugInfoReader reader;
         debug_info_reader_init(&reader, obj);
         while (reader.p < reader.pend) {
-            if (di_read_cu(&reader)) goto fail;
-            debug_info_read(&reader, num_traces, traces, lines, offset);
+            if (di_read_cu(&reader, errout)) goto fail;
+            if (!debug_info_read(&reader, num_traces, traces, lines, offset, errout))
+                goto fail;
         }
     }
 
     if (parse_debug_line(num_traces, traces,
             obj->debug_line.ptr,
             obj->debug_line.size,
-            obj, lines, offset) == -1)
+            obj, lines, offset, errout) == -1)
         goto fail;
 
     return dladdr_fbase;
@@ -2193,7 +2517,7 @@ fail:
 #if defined(__FreeBSD__) || defined(__DragonFly__)
 # include <sys/sysctl.h>
 #endif
-/* ssize_t main_exe_path(void)
+/* ssize_t main_exe_path(FILE *errout)
  *
  * store the path of the main executable to `binary_filename`,
  * and returns strlen(binary_filename).
@@ -2201,7 +2525,7 @@ fail:
  */
 #if defined(__linux__) || defined(__NetBSD__)
 static ssize_t
-main_exe_path(void)
+main_exe_path(FILE *errout)
 {
 # if defined(__linux__)
 #  define PROC_SELF_EXE "/proc/self/exe"
@@ -2215,21 +2539,21 @@ main_exe_path(void)
 }
 #elif defined(__FreeBSD__) || defined(__DragonFly__)
 static ssize_t
-main_exe_path(void)
+main_exe_path(FILE *errout)
 {
     int mib[4] = {CTL_KERN, KERN_PROC, KERN_PROC_PATHNAME, -1};
     size_t len = PATH_MAX;
     int err = sysctl(mib, 4, binary_filename, &len, NULL, 0);
     if (err) {
-	kprintf("Can't get the path of ruby");
-	return -1;
+        kprintf("Can't get the path of ruby");
+        return -1;
     }
     len--; /* sysctl sets strlen+1 */
     return len;
 }
 #elif defined(HAVE_LIBPROC_H)
 static ssize_t
-main_exe_path(void)
+main_exe_path(FILE *errout)
 {
     int len = proc_pidpath(getpid(), binary_filename, PATH_MAX);
     if (len == 0) return 0;
@@ -2241,7 +2565,7 @@ main_exe_path(void)
 #endif
 
 static void
-print_line0(line_info_t *line, void *address)
+print_line0(line_info_t *line, void *address, FILE *errout)
 {
     uintptr_t addr = (uintptr_t)address;
     uintptr_t d = addr - line->saddr;
@@ -2257,9 +2581,12 @@ print_line0(line_info_t *line, void *address)
     else if (!line->path) {
         kprintf("[0x%"PRIxPTR"]\n", addr);
     }
-    else if (!line->saddr || !line->sname) {
+    else if (!line->sname) {
         kprintf("%s(0x%"PRIxPTR") [0x%"PRIxPTR"]\n", line->path, addr-line->base_addr, addr);
     }
+    else if (!line->saddr) {
+        kprintf("%s(%s) [0x%"PRIxPTR"]\n", line->path, line->sname, addr);
+    }
     else if (line->line <= 0) {
         kprintf("%s(%s+0x%"PRIxPTR") [0x%"PRIxPTR"]\n", line->path, line->sname,
                 d, addr);
@@ -2279,16 +2606,16 @@ print_line0(line_info_t *line, void *address)
 }
 
 static void
-print_line(line_info_t *line, void *address)
+print_line(line_info_t *line, void *address, FILE *errout)
 {
-    print_line0(line, address);
+    print_line0(line, address, errout);
     if (line->next) {
-        print_line(line->next, NULL);
+        print_line(line->next, NULL, errout);
     }
 }
 
 void
-rb_dump_backtrace_with_lines(int num_traces, void **traces)
+rb_dump_backtrace_with_lines(int num_traces, void **traces, FILE *errout)
 {
     int i;
     /* async-signal unsafe */
@@ -2296,81 +2623,84 @@ rb_dump_backtrace_with_lines(int num_traces, void **traces)
     obj_info_t *obj = NULL;
     /* 2 is NULL + main executable */
     void **dladdr_fbases = (void **)calloc(num_traces+2, sizeof(void *));
+
 #ifdef HAVE_MAIN_EXE_PATH
     char *main_path = NULL; /* used on printing backtrace */
     ssize_t len;
-    if ((len = main_exe_path()) > 0) {
-	main_path = (char *)alloca(len + 1);
-	if (main_path) {
-	    uintptr_t addr;
-	    memcpy(main_path, binary_filename, len+1);
-	    append_obj(&obj);
-	    obj->path = main_path;
-	    addr = fill_lines(num_traces, traces, 1, &obj, lines, -1);
-	    if (addr != (uintptr_t)-1) {
-		dladdr_fbases[0] = (void *)addr;
-	    }
-	}
+    if ((len = main_exe_path(errout)) > 0) {
+        main_path = (char *)alloca(len + 1);
+        if (main_path) {
+            uintptr_t addr;
+            memcpy(main_path, binary_filename, len+1);
+            append_obj(&obj);
+            obj->path = main_path;
+            addr = fill_lines(num_traces, traces, 1, &obj, lines, 0, errout);
+            if (addr != (uintptr_t)-1) {
+                dladdr_fbases[0] = (void *)addr;
+            }
+        }
     }
 #endif
 
     /* fill source lines by reading dwarf */
     for (i = 0; i < num_traces; i++) {
-	Dl_info info;
-	if (lines[i].line) continue;
-	if (dladdr(traces[i], &info)) {
-	    const char *path;
-	    void **p;
-
-	    /* skip symbols which is in already checked objects */
-	    /* if the binary is strip-ed, this may effect */
-	    for (p=dladdr_fbases; *p; p++) {
-		if (*p == info.dli_fbase) {
-		    lines[i].path = info.dli_fname;
-		    lines[i].sname = info.dli_sname;
-		    goto next_line;
-		}
-	    }
-	    *p = info.dli_fbase;
-
-	    append_obj(&obj);
-	    obj->base_addr = (uintptr_t)info.dli_fbase;
-	    path = info.dli_fname;
-	    obj->path = path;
-	    lines[i].path = path;
-            lines[i].sname = info.dli_sname;
-            lines[i].saddr = (uintptr_t)info.dli_saddr;
-	    strlcpy(binary_filename, path, PATH_MAX);
-	    if (fill_lines(num_traces, traces, 1, &obj, lines, i) == (uintptr_t)-1)
-		break;
-	}
+        Dl_info info;
+        if (lines[i].line) continue;
+        if (dladdr(traces[i], &info)) {
+            const char *path;
+            void **p;
+
+            /* skip symbols which is in already checked objects */
+            /* if the binary is strip-ed, this may effect */
+            for (p=dladdr_fbases; *p; p++) {
+                if (*p == info.dli_fbase) {
+                    if (info.dli_fname) lines[i].path = info.dli_fname;
+                    if (info.dli_sname) lines[i].sname = info.dli_sname;
+                    goto next_line;
+                }
+            }
+            *p = info.dli_fbase;
+
+            append_obj(&obj);
+            obj->base_addr = (uintptr_t)info.dli_fbase;
+            path = info.dli_fname;
+            obj->path = path;
+            if (path) lines[i].path = path;
+            if (info.dli_sname) {
+                lines[i].sname = info.dli_sname;
+                lines[i].saddr = (uintptr_t)info.dli_saddr;
+            }
+            strlcpy(binary_filename, path, PATH_MAX);
+            if (fill_lines(num_traces, traces, 1, &obj, lines, i, errout) == (uintptr_t)-1)
+                break;
+        }
 next_line:
-	continue;
+        continue;
     }
 
     /* output */
     for (i = 0; i < num_traces; i++) {
-        print_line(&lines[i], traces[i]);
+        print_line(&lines[i], traces[i], errout);
 
-	/* FreeBSD's backtrace may show _start and so on */
-	if (lines[i].sname && strcmp("main", lines[i].sname) == 0)
-	    break;
+        /* FreeBSD's backtrace may show _start and so on */
+        if (lines[i].sname && strcmp("main", lines[i].sname) == 0)
+            break;
     }
 
     /* free */
     while (obj) {
-	obj_info_t *o = obj;
+        obj_info_t *o = obj;
         for (i=0; i < DWARF_SECTION_COUNT; i++) {
             struct dwarf_section *s = obj_dwarf_section_at(obj, i);
             if (s->flags & SHF_COMPRESSED) {
                 free(s->ptr);
             }
         }
-	if (obj->mapped_size) {
-	    munmap(obj->mapped, obj->mapped_size);
-	}
-	obj = o->next;
-	free(o);
+        if (obj->mapped_size) {
+            munmap(obj->mapped, obj->mapped_size);
+        }
+        obj = o->next;
+        free(o);
     }
     for (i = 0; i < num_traces; i++) {
         line_info_t *line = lines[i].next;
@@ -2384,435 +2714,8 @@ next_line:
     free(dladdr_fbases);
 }
 
-/* From FreeBSD's lib/libstand/printf.c */
-/*-
- * Copyright (c) 1986, 1988, 1991, 1993
- *	The Regents of the University of California.  All rights reserved.
- * (c) UNIX System Laboratories, Inc.
- * All or some portions of this file are derived from material licensed
- * to the University of California by American Telephone and Telegraph
- * Co. or Unix System Laboratories, Inc. and are reproduced herein with
- * the permission of UNIX System Laboratories, Inc.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in the
- *    documentation and/or other materials provided with the distribution.
- * 4. Neither the name of the University nor the names of its contributors
- *    may be used to endorse or promote products derived from this software
- *    without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- *
- *	@(#)subr_prf.c	8.3 (Berkeley) 1/21/94
- */
-
-#include <stdarg.h>
-#define MAXNBUF (sizeof(intmax_t) * CHAR_BIT + 1)
-static inline int toupper(int c) { return ('A' <= c && c <= 'Z') ? (c&0x5f) : c; }
-#define    hex2ascii(hex)  (hex2ascii_data[hex])
-static const char hex2ascii_data[] = "0123456789abcdefghijklmnopqrstuvwxyz";
-static inline int imax(int a, int b) { return (a > b ? a : b); }
-static int kvprintf(char const *fmt, void (*func)(int), void *arg, int radix, va_list ap);
-
-static void putce(int c)
-{
-    char s[1];
-    ssize_t ret;
-
-    s[0] = (char)c;
-    ret = write(2, s, 1);
-    (void)ret;
-}
-
-static int
-kprintf(const char *fmt, ...)
-{
-	va_list ap;
-	int retval;
-
-	va_start(ap, fmt);
-	retval = kvprintf(fmt, putce, NULL, 10, ap);
-	va_end(ap);
-	return retval;
-}
-
-/*
- * Put a NUL-terminated ASCII number (base <= 36) in a buffer in reverse
- * order; return an optional length and a pointer to the last character
- * written in the buffer (i.e., the first character of the string).
- * The buffer pointed to by `nbuf' must have length >= MAXNBUF.
- */
-static char *
-ksprintn(char *nbuf, uintmax_t num, int base, int *lenp, int upper)
-{
-	char *p, c;
-
-	p = nbuf;
-	*p = '\0';
-	do {
-		c = hex2ascii(num % base);
-		*++p = upper ? toupper(c) : c;
-	} while (num /= base);
-	if (lenp)
-		*lenp = (int)(p - nbuf);
-	return (p);
-}
+#undef kprintf
 
-/*
- * Scaled down version of printf(3).
- *
- * Two additional formats:
- *
- * The format %b is supported to decode error registers.
- * Its usage is:
- *
- *	printf("reg=%b\n", regval, "<base><arg>*");
- *
- * where <base> is the output base expressed as a control character, e.g.
- * \10 gives octal; \20 gives hex.  Each arg is a sequence of characters,
- * the first of which gives the bit number to be inspected (origin 1), and
- * the next characters (up to a control character, i.e. a character <= 32),
- * give the name of the register.  Thus:
- *
- *	kvprintf("reg=%b\n", 3, "\10\2BITTWO\1BITONE\n");
- *
- * would produce output:
- *
- *	reg=3<BITTWO,BITONE>
- *
- * XXX:  %D  -- Hexdump, takes pointer and separator string:
- *		("%6D", ptr, ":")   -> XX:XX:XX:XX:XX:XX
- *		("%*D", len, ptr, " " -> XX XX XX XX ...
- */
-static int
-kvprintf(char const *fmt, void (*func)(int), void *arg, int radix, va_list ap)
-{
-#define PCHAR(c) {int cc=(c); if (func) (*func)(cc); else *d++ = cc; retval++; }
-	char nbuf[MAXNBUF];
-	char *d;
-	const char *p, *percent, *q;
-	unsigned char *up;
-	int ch, n;
-	uintmax_t num;
-	int base, lflag, qflag, tmp, width, ladjust, sharpflag, neg, sign, dot;
-	int cflag, hflag, jflag, tflag, zflag;
-	int dwidth, upper;
-	char padc;
-	int stop = 0, retval = 0;
-
-	num = 0;
-	if (!func)
-		d = (char *) arg;
-	else
-		d = NULL;
-
-	if (fmt == NULL)
-		fmt = "(fmt null)\n";
-
-	if (radix < 2 || radix > 36)
-		radix = 10;
-
-	for (;;) {
-		padc = ' ';
-		width = 0;
-		while ((ch = (unsigned char)*fmt++) != '%' || stop) {
-			if (ch == '\0')
-				return (retval);
-			PCHAR(ch);
-		}
-		percent = fmt - 1;
-		qflag = 0; lflag = 0; ladjust = 0; sharpflag = 0; neg = 0;
-		sign = 0; dot = 0; dwidth = 0; upper = 0;
-		cflag = 0; hflag = 0; jflag = 0; tflag = 0; zflag = 0;
-reswitch:	switch (ch = (unsigned char)*fmt++) {
-		case '.':
-			dot = 1;
-			goto reswitch;
-		case '#':
-			sharpflag = 1;
-			goto reswitch;
-		case '+':
-			sign = 1;
-			goto reswitch;
-		case '-':
-			ladjust = 1;
-			goto reswitch;
-		case '%':
-			PCHAR(ch);
-			break;
-		case '*':
-			if (!dot) {
-				width = va_arg(ap, int);
-				if (width < 0) {
-					ladjust = !ladjust;
-					width = -width;
-				}
-			} else {
-				dwidth = va_arg(ap, int);
-			}
-			goto reswitch;
-		case '0':
-			if (!dot) {
-				padc = '0';
-				goto reswitch;
-			}
-		case '1': case '2': case '3': case '4':
-		case '5': case '6': case '7': case '8': case '9':
-				for (n = 0;; ++fmt) {
-					n = n * 10 + ch - '0';
-					ch = *fmt;
-					if (ch < '0' || ch > '9')
-						break;
-				}
-			if (dot)
-				dwidth = n;
-			else
-				width = n;
-			goto reswitch;
-		case 'b':
-			num = (unsigned int)va_arg(ap, int);
-			p = va_arg(ap, char *);
-			for (q = ksprintn(nbuf, num, *p++, NULL, 0); *q;)
-				PCHAR(*q--);
-
-			if (num == 0)
-				break;
-
-			for (tmp = 0; *p;) {
-				n = *p++;
-				if (num & (1 << (n - 1))) {
-					PCHAR(tmp ? ',' : '<');
-					for (; (n = *p) > ' '; ++p)
-						PCHAR(n);
-					tmp = 1;
-				} else
-					for (; *p > ' '; ++p)
-						continue;
-			}
-			if (tmp)
-				PCHAR('>');
-			break;
-		case 'c':
-			PCHAR(va_arg(ap, int));
-			break;
-		case 'D':
-			up = va_arg(ap, unsigned char *);
-			p = va_arg(ap, char *);
-			if (!width)
-				width = 16;
-			while(width--) {
-				PCHAR(hex2ascii(*up >> 4));
-				PCHAR(hex2ascii(*up & 0x0f));
-				up++;
-				if (width)
-					for (q=p;*q;q++)
-						PCHAR(*q);
-			}
-			break;
-		case 'd':
-		case 'i':
-			base = 10;
-			sign = 1;
-			goto handle_sign;
-		case 'h':
-			if (hflag) {
-				hflag = 0;
-				cflag = 1;
-			} else
-				hflag = 1;
-			goto reswitch;
-		case 'j':
-			jflag = 1;
-			goto reswitch;
-		case 'l':
-			if (lflag) {
-				lflag = 0;
-				qflag = 1;
-			} else
-				lflag = 1;
-			goto reswitch;
-		case 'n':
-			if (jflag)
-				*(va_arg(ap, intmax_t *)) = retval;
-			else if (qflag)
-				*(va_arg(ap, int64_t *)) = retval;
-			else if (lflag)
-				*(va_arg(ap, long *)) = retval;
-			else if (zflag)
-				*(va_arg(ap, size_t *)) = retval;
-			else if (hflag)
-				*(va_arg(ap, short *)) = retval;
-			else if (cflag)
-				*(va_arg(ap, char *)) = retval;
-			else
-				*(va_arg(ap, int *)) = retval;
-			break;
-		case 'o':
-			base = 8;
-			goto handle_nosign;
-		case 'p':
-			base = 16;
-			sharpflag = (width == 0);
-			sign = 0;
-			num = (uintptr_t)va_arg(ap, void *);
-			goto number;
-		case 'q':
-			qflag = 1;
-			goto reswitch;
-		case 'r':
-			base = radix;
-			if (sign)
-				goto handle_sign;
-			goto handle_nosign;
-		case 's':
-			p = va_arg(ap, char *);
-			if (p == NULL)
-				p = "(null)";
-			if (!dot)
-				n = (int)strlen (p);
-			else
-				for (n = 0; n < dwidth && p[n]; n++)
-					continue;
-
-			width -= n;
-
-			if (!ladjust && width > 0)
-				while (width--)
-					PCHAR(padc);
-			while (n--)
-				PCHAR(*p++);
-			if (ladjust && width > 0)
-				while (width--)
-					PCHAR(padc);
-			break;
-		case 't':
-			tflag = 1;
-			goto reswitch;
-		case 'u':
-			base = 10;
-			goto handle_nosign;
-		case 'X':
-			upper = 1;
-		case 'x':
-			base = 16;
-			goto handle_nosign;
-		case 'y':
-			base = 16;
-			sign = 1;
-			goto handle_sign;
-		case 'z':
-			zflag = 1;
-			goto reswitch;
-handle_nosign:
-			sign = 0;
-			if (jflag)
-				num = va_arg(ap, uintmax_t);
-			else if (qflag)
-				num = va_arg(ap, uint64_t);
-			else if (tflag)
-				num = va_arg(ap, ptrdiff_t);
-			else if (lflag)
-				num = va_arg(ap, unsigned long);
-			else if (zflag)
-				num = va_arg(ap, size_t);
-			else if (hflag)
-				num = (unsigned short)va_arg(ap, int);
-			else if (cflag)
-				num = (unsigned char)va_arg(ap, int);
-			else
-				num = va_arg(ap, unsigned int);
-			goto number;
-handle_sign:
-			if (jflag)
-				num = va_arg(ap, intmax_t);
-			else if (qflag)
-				num = va_arg(ap, int64_t);
-			else if (tflag)
-				num = va_arg(ap, ptrdiff_t);
-			else if (lflag)
-				num = va_arg(ap, long);
-			else if (zflag)
-				num = va_arg(ap, ssize_t);
-			else if (hflag)
-				num = (short)va_arg(ap, int);
-			else if (cflag)
-				num = (char)va_arg(ap, int);
-			else
-				num = va_arg(ap, int);
-number:
-			if (sign && (intmax_t)num < 0) {
-				neg = 1;
-				num = -(intmax_t)num;
-			}
-			p = ksprintn(nbuf, num, base, &n, upper);
-			tmp = 0;
-			if (sharpflag && num != 0) {
-				if (base == 8)
-					tmp++;
-				else if (base == 16)
-					tmp += 2;
-			}
-			if (neg)
-				tmp++;
-
-			if (!ladjust && padc == '0')
-				dwidth = width - tmp;
-			width -= tmp + imax(dwidth, n);
-			dwidth -= n;
-			if (!ladjust)
-				while (width-- > 0)
-					PCHAR(' ');
-			if (neg)
-				PCHAR('-');
-			if (sharpflag && num != 0) {
-				if (base == 8) {
-					PCHAR('0');
-				} else if (base == 16) {
-					PCHAR('0');
-					PCHAR('x');
-				}
-			}
-			while (dwidth-- > 0)
-				PCHAR('0');
-
-			while (*p)
-				PCHAR(*p--);
-
-			if (ladjust)
-				while (width-- > 0)
-					PCHAR(' ');
-
-			break;
-		default:
-			while (percent < fmt)
-				PCHAR(*percent++);
-			/*
-			 * Since we ignore an formatting argument it is no
-			 * longer safe to obey the remaining formatting
-			 * arguments as the arguments will no longer match
-			 * the format specs.
-			 */
-			stop = 1;
-			break;
-		}
-	}
-#undef PCHAR
-}
 #else /* defined(USE_ELF) */
 #error not supported
 #endif
diff --git a/addr2line.h b/addr2line.h
index f09b665800..ff8e476b92 100644
--- a/addr2line.h
+++ b/addr2line.h
@@ -12,8 +12,10 @@
 
 #if (defined(USE_ELF) || defined(HAVE_MACH_O_LOADER_H))
 
+#include <stdio.h>
+
 void
-rb_dump_backtrace_with_lines(int num_traces, void **traces);
+rb_dump_backtrace_with_lines(int num_traces, void **traces, FILE *errout);
 
 #endif /* USE_ELF */
 
diff --git a/array.c b/array.c
index 7b3f5bd0b0..b471823876 100644
--- a/array.c
+++ b/array.c
@@ -27,8 +27,10 @@
 #include "probes.h"
 #include "ruby/encoding.h"
 #include "ruby/st.h"
+#include "ruby/thread.h"
 #include "ruby/util.h"
-#include "transient_heap.h"
+#include "ruby/ractor.h"
+#include "vm_core.h"
 #include "builtin.h"
 
 #if !ARRAY_DEBUG
@@ -38,6 +40,31 @@
 #include "ruby_assert.h"
 
 VALUE rb_cArray;
+VALUE rb_cArray_empty_frozen;
+
+/* Flags of RArray
+ *
+ * 0:   RARRAY_SHARED_FLAG (equal to ELTS_SHARED)
+ *          The array is shared. The buffer this array points to is owned by
+ *          another array (the shared root).
+ * 1:   RARRAY_EMBED_FLAG
+ *          The array is embedded (its contents follow the header, rather than
+ *          being on a separately allocated buffer).
+ * 3-9: RARRAY_EMBED_LEN
+ *          The length of the array when RARRAY_EMBED_FLAG is set.
+ * 12:  RARRAY_SHARED_ROOT_FLAG
+ *          The array is a shared root that does reference counting. The buffer
+ *          this array points to is owned by this array but may be pointed to
+ *          by other arrays.
+ *          Note: Frozen arrays may be a shared root without this flag being
+ *                set. Frozen arrays do not have reference counting because
+ *                they cannot be modified. Not updating the reference count
+ *                improves copy-on-write performance. Their reference count is
+ *                assumed to be infinity.
+ * 14:  RARRAY_PTR_IN_USE_FLAG
+ *          The buffer of the array is in use. This is only used during
+ *          debugging.
+ */
 
 /* for OPTIMIZED_CMP: */
 #define id_cmp idCmp
@@ -53,66 +80,49 @@ should_be_T_ARRAY(VALUE ary)
     return RB_TYPE_P(ary, T_ARRAY);
 }
 
-RBIMPL_ATTR_MAYBE_UNUSED()
-static int
-should_not_be_shared_and_embedded(VALUE ary)
-{
-    return !FL_TEST((ary), ELTS_SHARED) || !FL_TEST((ary), RARRAY_EMBED_FLAG);
-}
-
-#define ARY_SHARED_P(ary) \
-  (assert(should_be_T_ARRAY((VALUE)(ary))), \
-   assert(should_not_be_shared_and_embedded((VALUE)ary)), \
-   FL_TEST_RAW((ary),ELTS_SHARED)!=0)
-
-#define ARY_EMBED_P(ary) \
-  (assert(should_be_T_ARRAY((VALUE)(ary))), \
-   assert(should_not_be_shared_and_embedded((VALUE)ary)), \
-   FL_TEST_RAW((ary), RARRAY_EMBED_FLAG) != 0)
-
-#define ARY_HEAP_PTR(a) (assert(!ARY_EMBED_P(a)), RARRAY(a)->as.heap.ptr)
-#define ARY_HEAP_LEN(a) (assert(!ARY_EMBED_P(a)), RARRAY(a)->as.heap.len)
-#define ARY_HEAP_CAPA(a) (assert(!ARY_EMBED_P(a)), assert(!ARY_SHARED_ROOT_P(a)), \
+#define ARY_HEAP_PTR(a) (RUBY_ASSERT(!ARY_EMBED_P(a)), RARRAY(a)->as.heap.ptr)
+#define ARY_HEAP_LEN(a) (RUBY_ASSERT(!ARY_EMBED_P(a)), RARRAY(a)->as.heap.len)
+#define ARY_HEAP_CAPA(a) (RUBY_ASSERT(!ARY_EMBED_P(a)), RUBY_ASSERT(!ARY_SHARED_ROOT_P(a)), \
                           RARRAY(a)->as.heap.aux.capa)
 
-#define ARY_EMBED_PTR(a) (assert(ARY_EMBED_P(a)), RARRAY(a)->as.ary)
+#define ARY_EMBED_PTR(a) (RUBY_ASSERT(ARY_EMBED_P(a)), RARRAY(a)->as.ary)
 #define ARY_EMBED_LEN(a) \
-    (assert(ARY_EMBED_P(a)), \
+    (RUBY_ASSERT(ARY_EMBED_P(a)), \
      (long)((RBASIC(a)->flags >> RARRAY_EMBED_LEN_SHIFT) & \
-	 (RARRAY_EMBED_LEN_MASK >> RARRAY_EMBED_LEN_SHIFT)))
-#define ARY_HEAP_SIZE(a) (assert(!ARY_EMBED_P(a)), assert(ARY_OWNS_HEAP_P(a)), ARY_CAPA(a) * sizeof(VALUE))
+         (RARRAY_EMBED_LEN_MASK >> RARRAY_EMBED_LEN_SHIFT)))
+#define ARY_HEAP_SIZE(a) (RUBY_ASSERT(!ARY_EMBED_P(a)), RUBY_ASSERT(ARY_OWNS_HEAP_P(a)), ARY_CAPA(a) * sizeof(VALUE))
 
-#define ARY_OWNS_HEAP_P(a) (assert(should_be_T_ARRAY((VALUE)(a))), \
-                            !FL_TEST_RAW((a), ELTS_SHARED|RARRAY_EMBED_FLAG))
+#define ARY_OWNS_HEAP_P(a) (RUBY_ASSERT(should_be_T_ARRAY((VALUE)(a))), \
+                            !FL_TEST_RAW((a), RARRAY_SHARED_FLAG|RARRAY_EMBED_FLAG))
 
 #define FL_SET_EMBED(a) do { \
-    assert(!ARY_SHARED_P(a)); \
+    RUBY_ASSERT(!ARY_SHARED_P(a)); \
     FL_SET((a), RARRAY_EMBED_FLAG); \
-    RARY_TRANSIENT_UNSET(a); \
     ary_verify(a); \
 } while (0)
 
 #define FL_UNSET_EMBED(ary) FL_UNSET((ary), RARRAY_EMBED_FLAG|RARRAY_EMBED_LEN_MASK)
 #define FL_SET_SHARED(ary) do { \
-    assert(!ARY_EMBED_P(ary)); \
-    FL_SET((ary), ELTS_SHARED); \
+    RUBY_ASSERT(!ARY_EMBED_P(ary)); \
+    FL_SET((ary), RARRAY_SHARED_FLAG); \
 } while (0)
-#define FL_UNSET_SHARED(ary) FL_UNSET((ary), ELTS_SHARED)
+#define FL_UNSET_SHARED(ary) FL_UNSET((ary), RARRAY_SHARED_FLAG)
 
+#define ARY_SET_PTR_FORCE(ary, p) \
+    (RARRAY(ary)->as.heap.ptr = (p))
 #define ARY_SET_PTR(ary, p) do { \
-    assert(!ARY_EMBED_P(ary)); \
-    assert(!OBJ_FROZEN(ary)); \
-    RARRAY(ary)->as.heap.ptr = (p); \
+    RUBY_ASSERT(!ARY_EMBED_P(ary)); \
+    RUBY_ASSERT(!OBJ_FROZEN(ary)); \
+    ARY_SET_PTR_FORCE(ary, p); \
 } while (0)
 #define ARY_SET_EMBED_LEN(ary, n) do { \
     long tmp_n = (n); \
-    assert(ARY_EMBED_P(ary)); \
-    assert(!OBJ_FROZEN(ary)); \
+    RUBY_ASSERT(ARY_EMBED_P(ary)); \
     RBASIC(ary)->flags &= ~RARRAY_EMBED_LEN_MASK; \
     RBASIC(ary)->flags |= (tmp_n) << RARRAY_EMBED_LEN_SHIFT; \
 } while (0)
 #define ARY_SET_HEAP_LEN(ary, n) do { \
-    assert(!ARY_EMBED_P(ary)); \
+    RUBY_ASSERT(!ARY_EMBED_P(ary)); \
     RARRAY(ary)->as.heap.len = (n); \
 } while (0)
 #define ARY_SET_LEN(ary, n) do { \
@@ -122,15 +132,15 @@ should_not_be_shared_and_embedded(VALUE ary)
     else { \
         ARY_SET_HEAP_LEN((ary), (n)); \
     } \
-    assert(RARRAY_LEN(ary) == (n)); \
+    RUBY_ASSERT(RARRAY_LEN(ary) == (n)); \
 } while (0)
 #define ARY_INCREASE_PTR(ary, n) do  { \
-    assert(!ARY_EMBED_P(ary)); \
-    assert(!OBJ_FROZEN(ary)); \
+    RUBY_ASSERT(!ARY_EMBED_P(ary)); \
+    RUBY_ASSERT(!OBJ_FROZEN(ary)); \
     RARRAY(ary)->as.heap.ptr += (n); \
 } while (0)
 #define ARY_INCREASE_LEN(ary, n) do  { \
-    assert(!OBJ_FROZEN(ary)); \
+    RUBY_ASSERT(!OBJ_FROZEN(ary)); \
     if (ARY_EMBED_P(ary)) { \
         ARY_SET_EMBED_LEN((ary), RARRAY_LEN(ary)+(n)); \
     } \
@@ -141,44 +151,33 @@ should_not_be_shared_and_embedded(VALUE ary)
 
 #define ARY_CAPA(ary) (ARY_EMBED_P(ary) ? ary_embed_capa(ary) : \
                        ARY_SHARED_ROOT_P(ary) ? RARRAY_LEN(ary) : ARY_HEAP_CAPA(ary))
+#define ARY_SET_CAPA_FORCE(ary, n) \
+    RARRAY(ary)->as.heap.aux.capa = (n);
 #define ARY_SET_CAPA(ary, n) do { \
-    assert(!ARY_EMBED_P(ary)); \
-    assert(!ARY_SHARED_P(ary)); \
-    assert(!OBJ_FROZEN(ary)); \
-    RARRAY(ary)->as.heap.aux.capa = (n); \
+    RUBY_ASSERT(!ARY_EMBED_P(ary)); \
+    RUBY_ASSERT(!ARY_SHARED_P(ary)); \
+    RUBY_ASSERT(!OBJ_FROZEN(ary)); \
+    ARY_SET_CAPA_FORCE(ary, n); \
 } while (0)
 
-#define ARY_SHARED_ROOT(ary) (assert(ARY_SHARED_P(ary)), RARRAY(ary)->as.heap.aux.shared_root)
-#define ARY_SET_SHARED(ary, value) do { \
-    const VALUE _ary_ = (ary); \
-    const VALUE _value_ = (value); \
-    assert(!ARY_EMBED_P(_ary_)); \
-    assert(ARY_SHARED_P(_ary_)); \
-    assert(ARY_SHARED_ROOT_P(_value_)); \
-    RB_OBJ_WRITE(_ary_, &RARRAY(_ary_)->as.heap.aux.shared_root, _value_); \
-} while (0)
-#define RARRAY_SHARED_ROOT_FLAG FL_USER12
-#define ARY_SHARED_ROOT_P(ary) (assert(should_be_T_ARRAY((VALUE)(ary))), \
-                                FL_TEST_RAW((ary), RARRAY_SHARED_ROOT_FLAG))
-#define ARY_SHARED_ROOT_REFCNT(ary) \
-    (assert(ARY_SHARED_ROOT_P(ary)), RARRAY(ary)->as.heap.aux.capa)
-#define ARY_SHARED_ROOT_OCCUPIED(ary) (ARY_SHARED_ROOT_REFCNT(ary) == 1)
+#define ARY_SHARED_ROOT_OCCUPIED(ary) (!OBJ_FROZEN(ary) && ARY_SHARED_ROOT_REFCNT(ary) == 1)
 #define ARY_SET_SHARED_ROOT_REFCNT(ary, value) do { \
-    assert(ARY_SHARED_ROOT_P(ary)); \
-    assert((value) >= 0); \
+    RUBY_ASSERT(ARY_SHARED_ROOT_P(ary)); \
+    RUBY_ASSERT(!OBJ_FROZEN(ary)); \
+    RUBY_ASSERT((value) >= 0); \
     RARRAY(ary)->as.heap.aux.capa = (value); \
 } while (0)
 #define FL_SET_SHARED_ROOT(ary) do { \
-    assert(!ARY_EMBED_P(ary)); \
-    assert(!RARRAY_TRANSIENT_P(ary)); \
+    RUBY_ASSERT(!OBJ_FROZEN(ary)); \
+    RUBY_ASSERT(!ARY_EMBED_P(ary)); \
     FL_SET((ary), RARRAY_SHARED_ROOT_FLAG); \
 } while (0)
 
 static inline void
 ARY_SET(VALUE a, long i, VALUE v)
 {
-    assert(!ARY_SHARED_P(a));
-    assert(!OBJ_FROZEN(a));
+    RUBY_ASSERT(!ARY_SHARED_P(a));
+    RUBY_ASSERT(!OBJ_FROZEN(a));
 
     RARRAY_ASET(a, i, v);
 }
@@ -187,29 +186,54 @@ ARY_SET(VALUE a, long i, VALUE v)
 static long
 ary_embed_capa(VALUE ary)
 {
-#if USE_RVARGC
     size_t size = rb_gc_obj_slot_size(ary) - offsetof(struct RArray, as.ary);
-    assert(size % sizeof(VALUE) == 0);
+    RUBY_ASSERT(size % sizeof(VALUE) == 0);
     return size / sizeof(VALUE);
-#else
-    return RARRAY_EMBED_LEN_MAX;
-#endif
 }
 
 static size_t
 ary_embed_size(long capa)
 {
-    return offsetof(struct RArray, as.ary) + (sizeof(VALUE) * capa);
+    size_t size = offsetof(struct RArray, as.ary) + (sizeof(VALUE) * capa);
+    if (size < sizeof(struct RArray)) size = sizeof(struct RArray);
+    return size;
 }
 
 static bool
 ary_embeddable_p(long capa)
 {
-#if USE_RVARGC
     return rb_gc_size_allocatable_p(ary_embed_size(capa));
-#else
-    return capa <= RARRAY_EMBED_LEN_MAX;
-#endif
+}
+
+bool
+rb_ary_embeddable_p(VALUE ary)
+{
+    /* An array cannot be turned embeddable when the array is:
+     *  - Shared root: other objects may point to the buffer of this array
+     *    so we cannot make it embedded.
+     *  - Frozen: this array may also be a shared root without the shared root
+     *    flag.
+     *  - Shared: we don't want to re-embed an array that points to a shared
+     *    root (to save memory).
+     */
+    return !(ARY_SHARED_ROOT_P(ary) || OBJ_FROZEN(ary) || ARY_SHARED_P(ary));
+}
+
+size_t
+rb_ary_size_as_embedded(VALUE ary)
+{
+    size_t real_size;
+
+    if (ARY_EMBED_P(ary)) {
+        real_size = ary_embed_size(ARY_EMBED_LEN(ary));
+    }
+    else if (rb_ary_embeddable_p(ary)) {
+        real_size = ary_embed_size(ARY_HEAP_CAPA(ary));
+    }
+    else {
+        real_size = sizeof(struct RArray);
+    }
+    return real_size;
 }
 
 
@@ -219,25 +243,23 @@ ary_embeddable_p(long capa)
 static VALUE
 ary_verify_(VALUE ary, const char *file, int line)
 {
-    assert(RB_TYPE_P(ary, T_ARRAY));
+    RUBY_ASSERT(RB_TYPE_P(ary, T_ARRAY));
 
-    if (FL_TEST(ary, ELTS_SHARED)) {
-        VALUE root = RARRAY(ary)->as.heap.aux.shared_root;
+    if (ARY_SHARED_P(ary)) {
+        VALUE root = ARY_SHARED_ROOT(ary);
         const VALUE *ptr = ARY_HEAP_PTR(ary);
-        const VALUE *root_ptr = RARRAY_CONST_PTR_TRANSIENT(root);
+        const VALUE *root_ptr = RARRAY_CONST_PTR(root);
         long len = ARY_HEAP_LEN(ary), root_len = RARRAY_LEN(root);
-        assert(FL_TEST(root, RARRAY_SHARED_ROOT_FLAG));
-        assert(root_ptr <= ptr && ptr + len <= root_ptr + root_len);
+        RUBY_ASSERT(ARY_SHARED_ROOT_P(root) || OBJ_FROZEN(root));
+        RUBY_ASSERT(root_ptr <= ptr && ptr + len <= root_ptr + root_len);
         ary_verify(root);
     }
     else if (ARY_EMBED_P(ary)) {
-        assert(!RARRAY_TRANSIENT_P(ary));
-        assert(!ARY_SHARED_P(ary));
-        assert(RARRAY_LEN(ary) <= ary_embed_capa(ary));
+        RUBY_ASSERT(!ARY_SHARED_P(ary));
+        RUBY_ASSERT(RARRAY_LEN(ary) <= ary_embed_capa(ary));
     }
     else {
-#if 1
-        const VALUE *ptr = RARRAY_CONST_PTR_TRANSIENT(ary);
+        const VALUE *ptr = RARRAY_CONST_PTR(ary);
         long i, len = RARRAY_LEN(ary);
         volatile VALUE v;
         if (len > 1) len = 1; /* check only HEAD */
@@ -245,25 +267,10 @@ ary_verify_(VALUE ary, const char *file, int line)
             v = ptr[i]; /* access check */
         }
         v = v;
-#endif
-    }
-
-#if USE_TRANSIENT_HEAP
-    if (RARRAY_TRANSIENT_P(ary)) {
-        assert(rb_transient_heap_managed_ptr_p(RARRAY_CONST_PTR_TRANSIENT(ary)));
     }
-#endif
-
-    rb_transient_heap_verify();
 
     return ary;
 }
-
-void
-rb_ary_verify(VALUE ary)
-{
-    ary_verify(ary);
-}
 #else
 #define ary_verify(ary) ((void)0)
 #endif
@@ -274,7 +281,7 @@ rb_ary_ptr_use_start(VALUE ary)
 #if ARRAY_DEBUG
     FL_SET_RAW(ary, RARRAY_PTR_IN_USE_FLAG);
 #endif
-    return (VALUE *)RARRAY_CONST_PTR_TRANSIENT(ary);
+    return (VALUE *)RARRAY_CONST_PTR(ary);
 }
 
 void
@@ -289,15 +296,15 @@ void
 rb_mem_clear(VALUE *mem, long size)
 {
     while (size--) {
-	*mem++ = Qnil;
+        *mem++ = Qnil;
     }
 }
 
 static void
 ary_mem_clear(VALUE ary, long beg, long size)
 {
-    RARRAY_PTR_USE_TRANSIENT(ary, ptr, {
-	rb_mem_clear(ptr + beg, size);
+    RARRAY_PTR_USE(ary, ptr, {
+        rb_mem_clear(ptr + beg, size);
     });
 }
 
@@ -305,33 +312,33 @@ static inline void
 memfill(register VALUE *mem, register long size, register VALUE val)
 {
     while (size--) {
-	*mem++ = val;
+        *mem++ = val;
     }
 }
 
 static void
 ary_memfill(VALUE ary, long beg, long size, VALUE val)
 {
-    RARRAY_PTR_USE_TRANSIENT(ary, ptr, {
-	memfill(ptr + beg, size, val);
-	RB_OBJ_WRITTEN(ary, Qundef, val);
+    RARRAY_PTR_USE(ary, ptr, {
+        memfill(ptr + beg, size, val);
+        RB_OBJ_WRITTEN(ary, Qundef, val);
     });
 }
 
 static void
 ary_memcpy0(VALUE ary, long beg, long argc, const VALUE *argv, VALUE buff_owner_ary)
 {
-    assert(!ARY_SHARED_P(buff_owner_ary));
+    RUBY_ASSERT(!ARY_SHARED_P(buff_owner_ary));
 
     if (argc > (int)(128/sizeof(VALUE)) /* is magic number (cache line size) */) {
         rb_gc_writebarrier_remember(buff_owner_ary);
-        RARRAY_PTR_USE_TRANSIENT(ary, ptr, {
+        RARRAY_PTR_USE(ary, ptr, {
             MEMCPY(ptr+beg, argv, VALUE, argc);
         });
     }
     else {
         int i;
-        RARRAY_PTR_USE_TRANSIENT(ary, ptr, {
+        RARRAY_PTR_USE(ary, ptr, {
             for (i=0; i<argc; i++) {
                 RB_OBJ_WRITE(buff_owner_ary, &ptr[i+beg], argv[i]);
             }
@@ -346,140 +353,62 @@ ary_memcpy(VALUE ary, long beg, long argc, const VALUE *argv)
 }
 
 static VALUE *
-ary_heap_alloc(VALUE ary, size_t capa)
+ary_heap_alloc_buffer(size_t capa)
 {
-    VALUE *ptr = rb_transient_heap_alloc(ary, sizeof(VALUE) * capa);
-
-    if (ptr != NULL) {
-        RARY_TRANSIENT_SET(ary);
-    }
-    else {
-        RARY_TRANSIENT_UNSET(ary);
-        ptr = ALLOC_N(VALUE, capa);
-    }
-
-    return ptr;
+    return ALLOC_N(VALUE, capa);
 }
 
 static void
 ary_heap_free_ptr(VALUE ary, const VALUE *ptr, long size)
 {
-    if (RARRAY_TRANSIENT_P(ary)) {
-        /* ignore it */
-    }
-    else {
-        ruby_sized_xfree((void *)ptr, size);
-    }
+    ruby_sized_xfree((void *)ptr, size);
 }
 
 static void
 ary_heap_free(VALUE ary)
 {
-    if (RARRAY_TRANSIENT_P(ary)) {
-        RARY_TRANSIENT_UNSET(ary);
-    }
-    else {
-        ary_heap_free_ptr(ary, ARY_HEAP_PTR(ary), ARY_HEAP_SIZE(ary));
-    }
+    ary_heap_free_ptr(ary, ARY_HEAP_PTR(ary), ARY_HEAP_SIZE(ary));
 }
 
 static size_t
 ary_heap_realloc(VALUE ary, size_t new_capa)
 {
-    size_t alloc_capa = new_capa;
-    size_t old_capa = ARY_HEAP_CAPA(ary);
-
-    if (RARRAY_TRANSIENT_P(ary)) {
-        if (new_capa <= old_capa) {
-            /* do nothing */
-            alloc_capa = old_capa;
-        }
-        else {
-            VALUE *new_ptr = rb_transient_heap_alloc(ary, sizeof(VALUE) * new_capa);
-
-            if (new_ptr == NULL) {
-                new_ptr = ALLOC_N(VALUE, new_capa);
-                RARY_TRANSIENT_UNSET(ary);
-            }
-
-            MEMCPY(new_ptr, ARY_HEAP_PTR(ary), VALUE, old_capa);
-            ARY_SET_PTR(ary, new_ptr);
-        }
-    }
-    else {
-        SIZED_REALLOC_N(RARRAY(ary)->as.heap.ptr, VALUE, new_capa, old_capa);
-    }
+    RUBY_ASSERT(!OBJ_FROZEN(ary));
+    SIZED_REALLOC_N(RARRAY(ary)->as.heap.ptr, VALUE, new_capa, ARY_HEAP_CAPA(ary));
     ary_verify(ary);
 
-    return alloc_capa;
+    return new_capa;
 }
 
-#if USE_TRANSIENT_HEAP
-static inline void
-rb_ary_transient_heap_evacuate_(VALUE ary, int transient, int promote)
+void
+rb_ary_make_embedded(VALUE ary)
 {
-    if (transient) {
-        VALUE *new_ptr;
-        const VALUE *old_ptr = ARY_HEAP_PTR(ary);
-        long capa = ARY_HEAP_CAPA(ary);
-        long len  = ARY_HEAP_LEN(ary);
+    RUBY_ASSERT(rb_ary_embeddable_p(ary));
+    if (!ARY_EMBED_P(ary)) {
+        const VALUE *buf = ARY_HEAP_PTR(ary);
+        long len = ARY_HEAP_LEN(ary);
 
-        if (ARY_SHARED_ROOT_P(ary)) {
-            capa = len;
-        }
-
-        assert(ARY_OWNS_HEAP_P(ary));
-        assert(RARRAY_TRANSIENT_P(ary));
-        assert(!ARY_PTR_USING_P(ary));
+        FL_SET_EMBED(ary);
+        ARY_SET_EMBED_LEN(ary, len);
 
-        if (promote) {
-            new_ptr = ALLOC_N(VALUE, capa);
-            RARY_TRANSIENT_UNSET(ary);
-        }
-        else {
-            new_ptr = ary_heap_alloc(ary, capa);
-        }
+        MEMCPY((void *)ARY_EMBED_PTR(ary), (void *)buf, VALUE, len);
 
-        MEMCPY(new_ptr, old_ptr, VALUE, capa);
-        /* do not use ARY_SET_PTR() because they assert !frozen */
-        RARRAY(ary)->as.heap.ptr = new_ptr;
+        ary_heap_free_ptr(ary, buf, len * sizeof(VALUE));
     }
-
-    ary_verify(ary);
-}
-
-void
-rb_ary_transient_heap_evacuate(VALUE ary, int promote)
-{
-    rb_ary_transient_heap_evacuate_(ary, RARRAY_TRANSIENT_P(ary), promote);
 }
 
-void
-rb_ary_detransient(VALUE ary)
-{
-    assert(RARRAY_TRANSIENT_P(ary));
-    rb_ary_transient_heap_evacuate_(ary, TRUE, TRUE);
-}
-#else
-void
-rb_ary_detransient(VALUE ary)
-{
-    /* do nothing */
-}
-#endif
-
 static void
 ary_resize_capa(VALUE ary, long capacity)
 {
-    assert(RARRAY_LEN(ary) <= capacity);
-    assert(!OBJ_FROZEN(ary));
-    assert(!ARY_SHARED_P(ary));
+    RUBY_ASSERT(RARRAY_LEN(ary) <= capacity);
+    RUBY_ASSERT(!OBJ_FROZEN(ary));
+    RUBY_ASSERT(!ARY_SHARED_P(ary));
 
     if (capacity > ary_embed_capa(ary)) {
         size_t new_capa = capacity;
         if (ARY_EMBED_P(ary)) {
             long len = ARY_EMBED_LEN(ary);
-            VALUE *ptr = ary_heap_alloc(ary, capacity);
+            VALUE *ptr = ary_heap_alloc_buffer(capacity);
 
             MEMCPY(ptr, ARY_EMBED_PTR(ary), VALUE, len);
             FL_UNSET_EMBED(ary);
@@ -514,9 +443,12 @@ ary_shrink_capa(VALUE ary)
 {
     long capacity = ARY_HEAP_LEN(ary);
     long old_capa = ARY_HEAP_CAPA(ary);
-    assert(!ARY_SHARED_P(ary));
-    assert(old_capa >= capacity);
-    if (old_capa > capacity) ary_heap_realloc(ary, capacity);
+    RUBY_ASSERT(!ARY_SHARED_P(ary));
+    RUBY_ASSERT(old_capa >= capacity);
+    if (old_capa > capacity) {
+        size_t new_capa = ary_heap_realloc(ary, capacity);
+        ARY_SET_CAPA(ary, new_capa);
+    }
 
     ary_verify(ary);
 }
@@ -527,10 +459,10 @@ ary_double_capa(VALUE ary, long min)
     long new_capa = ARY_CAPA(ary) / 2;
 
     if (new_capa < ARY_DEFAULT_SIZE) {
-	new_capa = ARY_DEFAULT_SIZE;
+        new_capa = ARY_DEFAULT_SIZE;
     }
     if (new_capa >= ARY_MAX_SIZE - min) {
-	new_capa = (ARY_MAX_SIZE - min) / 2;
+        new_capa = (ARY_MAX_SIZE - min) / 2;
     }
     new_capa += min;
     ary_resize_capa(ary, new_capa);
@@ -541,14 +473,16 @@ ary_double_capa(VALUE ary, long min)
 static void
 rb_ary_decrement_share(VALUE shared_root)
 {
-    long num = ARY_SHARED_ROOT_REFCNT(shared_root);
-    ARY_SET_SHARED_ROOT_REFCNT(shared_root, num - 1);
+    if (!OBJ_FROZEN(shared_root)) {
+        long num = ARY_SHARED_ROOT_REFCNT(shared_root);
+        ARY_SET_SHARED_ROOT_REFCNT(shared_root, num - 1);
+    }
 }
 
 static void
 rb_ary_unshare(VALUE ary)
 {
-    VALUE shared_root = RARRAY(ary)->as.heap.aux.shared_root;
+    VALUE shared_root = ARY_SHARED_ROOT(ary);
     rb_ary_decrement_share(shared_root);
     FL_UNSET_SHARED(ary);
 }
@@ -570,24 +504,33 @@ rb_ary_reset(VALUE ary)
 static VALUE
 rb_ary_increment_share(VALUE shared_root)
 {
-    long num = ARY_SHARED_ROOT_REFCNT(shared_root);
-    assert(num >= 0);
-    ARY_SET_SHARED_ROOT_REFCNT(shared_root, num + 1);
+    if (!OBJ_FROZEN(shared_root)) {
+        long num = ARY_SHARED_ROOT_REFCNT(shared_root);
+        RUBY_ASSERT(num >= 0);
+        ARY_SET_SHARED_ROOT_REFCNT(shared_root, num + 1);
+    }
     return shared_root;
 }
 
 static void
 rb_ary_set_shared(VALUE ary, VALUE shared_root)
 {
+    RUBY_ASSERT(!ARY_EMBED_P(ary));
+    RUBY_ASSERT(!OBJ_FROZEN(ary));
+    RUBY_ASSERT(ARY_SHARED_ROOT_P(shared_root) || OBJ_FROZEN(shared_root));
+
     rb_ary_increment_share(shared_root);
     FL_SET_SHARED(ary);
+    RB_OBJ_WRITE(ary, &RARRAY(ary)->as.heap.aux.shared_root, shared_root);
+
     RB_DEBUG_COUNTER_INC(obj_ary_shared_create);
-    ARY_SET_SHARED(ary, shared_root);
 }
 
 static inline void
 rb_ary_modify_check(VALUE ary)
 {
+    RUBY_ASSERT(ruby_thread_has_gvl_p());
+
     rb_check_frozen(ary);
     ary_verify(ary);
 }
@@ -610,22 +553,22 @@ rb_ary_cancel_sharing(VALUE ary)
             ARY_SET_EMBED_LEN(ary, len);
         }
         else if (ARY_SHARED_ROOT_OCCUPIED(shared_root) && len > ((shared_len = RARRAY_LEN(shared_root))>>1)) {
-            long shift = RARRAY_CONST_PTR_TRANSIENT(ary) - RARRAY_CONST_PTR_TRANSIENT(shared_root);
+            long shift = RARRAY_CONST_PTR(ary) - RARRAY_CONST_PTR(shared_root);
             FL_UNSET_SHARED(ary);
-            ARY_SET_PTR(ary, RARRAY_CONST_PTR_TRANSIENT(shared_root));
+            ARY_SET_PTR(ary, RARRAY_CONST_PTR(shared_root));
             ARY_SET_CAPA(ary, shared_len);
-            RARRAY_PTR_USE_TRANSIENT(ary, ptr, {
+            RARRAY_PTR_USE(ary, ptr, {
                 MEMMOVE(ptr, ptr+shift, VALUE, len);
             });
             FL_SET_EMBED(shared_root);
             rb_ary_decrement_share(shared_root);
         }
         else {
-            VALUE *ptr = ary_heap_alloc(ary, len);
+            VALUE *ptr = ary_heap_alloc_buffer(len);
             MEMCPY(ptr, ARY_HEAP_PTR(ary), VALUE, len);
             rb_ary_unshare(ary);
-            ARY_SET_CAPA(ary, len);
-            ARY_SET_PTR(ary, ptr);
+            ARY_SET_CAPA_FORCE(ary, len);
+            ARY_SET_PTR_FORCE(ary, ptr);
         }
 
         rb_gc_writebarrier_remember(ary);
@@ -648,40 +591,40 @@ ary_ensure_room_for_push(VALUE ary, long add_len)
     long capa;
 
     if (old_len > ARY_MAX_SIZE - add_len) {
-	rb_raise(rb_eIndexError, "index %ld too big", new_len);
+        rb_raise(rb_eIndexError, "index %ld too big", new_len);
     }
     if (ARY_SHARED_P(ary)) {
-	if (new_len > ary_embed_capa(ary)) {
+        if (new_len > ary_embed_capa(ary)) {
             VALUE shared_root = ARY_SHARED_ROOT(ary);
             if (ARY_SHARED_ROOT_OCCUPIED(shared_root)) {
-                if (ARY_HEAP_PTR(ary) - RARRAY_CONST_PTR_TRANSIENT(shared_root) + new_len <= RARRAY_LEN(shared_root)) {
-		    rb_ary_modify_check(ary);
+                if (ARY_HEAP_PTR(ary) - RARRAY_CONST_PTR(shared_root) + new_len <= RARRAY_LEN(shared_root)) {
+                    rb_ary_modify_check(ary);
 
                     ary_verify(ary);
                     ary_verify(shared_root);
                     return shared_root;
-		}
-		else {
-		    /* if array is shared, then it is likely it participate in push/shift pattern */
-		    rb_ary_modify(ary);
-		    capa = ARY_CAPA(ary);
-		    if (new_len > capa - (capa >> 6)) {
-			ary_double_capa(ary, new_len);
-		    }
+                }
+                else {
+                    /* if array is shared, then it is likely it participate in push/shift pattern */
+                    rb_ary_modify(ary);
+                    capa = ARY_CAPA(ary);
+                    if (new_len > capa - (capa >> 6)) {
+                        ary_double_capa(ary, new_len);
+                    }
                     ary_verify(ary);
-		    return ary;
-		}
-	    }
-	}
+                    return ary;
+                }
+            }
+        }
         ary_verify(ary);
         rb_ary_modify(ary);
     }
     else {
-	rb_ary_modify_check(ary);
+        rb_ary_modify_check(ary);
     }
     capa = ARY_CAPA(ary);
     if (new_len > capa) {
-	ary_double_capa(ary, new_len);
+        ary_double_capa(ary, new_len);
     }
 
     ary_verify(ary);
@@ -690,21 +633,32 @@ ary_ensure_room_for_push(VALUE ary, long add_len)
 
 /*
  *  call-seq:
- *    array.freeze -> self
+ *    freeze -> self
  *
- *  Freezes +self+; returns +self+:
+ *  Freezes +self+ (if not already frozen); returns +self+:
  *
  *    a = []
  *    a.frozen? # => false
  *    a.freeze
  *    a.frozen? # => true
  *
- *  An attempt to modify a frozen \Array raises FrozenError.
+ *  No further changes may be made to +self+;
+ *  raises FrozenError if a change is attempted.
+ *
+ *  Related: Kernel#frozen?.
  */
 
 VALUE
 rb_ary_freeze(VALUE ary)
 {
+    RUBY_ASSERT(RB_TYPE_P(ary, T_ARRAY));
+
+    if (OBJ_FROZEN(ary)) return ary;
+
+    if (!ARY_EMBED_P(ary) && !ARY_SHARED_P(ary) && !ARY_SHARED_ROOT_P(ary)) {
+        ary_shrink_capa(ary);
+    }
+
     return rb_obj_freeze(ary);
 }
 
@@ -719,10 +673,10 @@ VALUE
 rb_ary_shared_with_p(VALUE ary1, VALUE ary2)
 {
     if (!ARY_EMBED_P(ary1) && ARY_SHARED_P(ary1) &&
-	!ARY_EMBED_P(ary2) && ARY_SHARED_P(ary2) &&
-        RARRAY(ary1)->as.heap.aux.shared_root == RARRAY(ary2)->as.heap.aux.shared_root &&
-	RARRAY(ary1)->as.heap.len == RARRAY(ary2)->as.heap.len) {
-	return Qtrue;
+            !ARY_EMBED_P(ary2) && ARY_SHARED_P(ary2) &&
+            ARY_SHARED_ROOT(ary1) == ARY_SHARED_ROOT(ary2) &&
+            ARY_HEAP_LEN(ary1) == ARY_HEAP_LEN(ary2)) {
+        return Qtrue;
     }
     return Qfalse;
 }
@@ -731,13 +685,10 @@ static VALUE
 ary_alloc_embed(VALUE klass, long capa)
 {
     size_t size = ary_embed_size(capa);
-    assert(rb_gc_size_allocatable_p(size));
-#if !USE_RVARGC
-    assert(size <= sizeof(struct RArray));
-#endif
-    RVARGC_NEWOBJ_OF(ary, struct RArray, klass,
+    RUBY_ASSERT(rb_gc_size_allocatable_p(size));
+    NEWOBJ_OF(ary, struct RArray, klass,
                      T_ARRAY | RARRAY_EMBED_FLAG | (RGENGC_WB_PROTECTED_ARRAY ? FL_WB_PROTECTED : 0),
-                     size);
+                     size, 0);
     /* Created array is:
      *   FL_SET_EMBED((VALUE)ary);
      *   ARY_SET_EMBED_LEN((VALUE)ary, 0);
@@ -748,9 +699,14 @@ ary_alloc_embed(VALUE klass, long capa)
 static VALUE
 ary_alloc_heap(VALUE klass)
 {
-    RVARGC_NEWOBJ_OF(ary, struct RArray, klass,
+    NEWOBJ_OF(ary, struct RArray, klass,
                      T_ARRAY | (RGENGC_WB_PROTECTED_ARRAY ? FL_WB_PROTECTED : 0),
-                     sizeof(struct RArray));
+                     sizeof(struct RArray), 0);
+
+    ary->as.heap.len = 0;
+    ary->as.heap.aux.capa = 0;
+    ary->as.heap.ptr = NULL;
+
     return (VALUE)ary;
 }
 
@@ -764,13 +720,15 @@ empty_ary_alloc(VALUE klass)
 static VALUE
 ary_new(VALUE klass, long capa)
 {
-    VALUE ary,*ptr;
+    RUBY_ASSERT(ruby_thread_has_gvl_p());
+
+    VALUE ary;
 
     if (capa < 0) {
-	rb_raise(rb_eArgError, "negative array size (or size too big)");
+        rb_raise(rb_eArgError, "negative array size (or size too big)");
     }
     if (capa > ARY_MAX_SIZE) {
-	rb_raise(rb_eArgError, "array size too big");
+        rb_raise(rb_eArgError, "array size too big");
     }
 
     RUBY_DTRACE_CREATE_HOOK(ARRAY, capa);
@@ -780,11 +738,10 @@ ary_new(VALUE klass, long capa)
     }
     else {
         ary = ary_alloc_heap(klass);
-        assert(!ARY_EMBED_P(ary));
-
-        ptr = ary_heap_alloc(ary, capa);
-        ARY_SET_PTR(ary, ptr);
         ARY_SET_CAPA(ary, capa);
+        RUBY_ASSERT(!ARY_EMBED_P(ary));
+
+        ARY_SET_PTR(ary, ary_heap_alloc_buffer(capa));
         ARY_SET_HEAP_LEN(ary, 0);
     }
 
@@ -814,7 +771,7 @@ VALUE
 
     va_start(ar, n);
     for (i=0; i<n; i++) {
-	ARY_SET(ary, i, va_arg(ar, VALUE));
+        ARY_SET(ary, i, va_arg(ar, VALUE));
     }
     va_end(ar);
 
@@ -822,15 +779,15 @@ VALUE
     return ary;
 }
 
-MJIT_FUNC_EXPORTED VALUE
+VALUE
 rb_ary_tmp_new_from_values(VALUE klass, long n, const VALUE *elts)
 {
     VALUE ary;
 
     ary = ary_new(klass, n);
     if (n > 0 && elts) {
-	ary_memcpy(ary, 0, n, elts);
-	ARY_SET_LEN(ary, n);
+        ary_memcpy(ary, 0, n, elts);
+        ARY_SET_LEN(ary, n);
     }
 
     return ary;
@@ -846,13 +803,10 @@ static VALUE
 ec_ary_alloc_embed(rb_execution_context_t *ec, VALUE klass, long capa)
 {
     size_t size = ary_embed_size(capa);
-    assert(rb_gc_size_allocatable_p(size));
-#if !USE_RVARGC
-    assert(size <= sizeof(struct RArray));
-#endif
-    RB_RVARGC_EC_NEWOBJ_OF(ec, ary, struct RArray, klass,
-                           T_ARRAY | RARRAY_EMBED_FLAG | (RGENGC_WB_PROTECTED_ARRAY ? FL_WB_PROTECTED : 0),
-                           size);
+    RUBY_ASSERT(rb_gc_size_allocatable_p(size));
+    NEWOBJ_OF(ary, struct RArray, klass,
+            T_ARRAY | RARRAY_EMBED_FLAG | (RGENGC_WB_PROTECTED_ARRAY ? FL_WB_PROTECTED : 0),
+            size, ec);
     /* Created array is:
      *   FL_SET_EMBED((VALUE)ary);
      *   ARY_SET_EMBED_LEN((VALUE)ary, 0);
@@ -863,22 +817,27 @@ ec_ary_alloc_embed(rb_execution_context_t *ec, VALUE klass, long capa)
 static VALUE
 ec_ary_alloc_heap(rb_execution_context_t *ec, VALUE klass)
 {
-    RB_RVARGC_EC_NEWOBJ_OF(ec, ary, struct RArray, klass,
-                           T_ARRAY | (RGENGC_WB_PROTECTED_ARRAY ? FL_WB_PROTECTED : 0),
-                           sizeof(struct RArray));
+    NEWOBJ_OF(ary, struct RArray, klass,
+            T_ARRAY | (RGENGC_WB_PROTECTED_ARRAY ? FL_WB_PROTECTED : 0),
+            sizeof(struct RArray), ec);
+
+    ary->as.heap.len = 0;
+    ary->as.heap.aux.capa = 0;
+    ary->as.heap.ptr = NULL;
+
     return (VALUE)ary;
 }
 
 static VALUE
 ec_ary_new(rb_execution_context_t *ec, VALUE klass, long capa)
 {
-    VALUE ary,*ptr;
+    VALUE ary;
 
     if (capa < 0) {
-	rb_raise(rb_eArgError, "negative array size (or size too big)");
+        rb_raise(rb_eArgError, "negative array size (or size too big)");
     }
     if (capa > ARY_MAX_SIZE) {
-	rb_raise(rb_eArgError, "array size too big");
+        rb_raise(rb_eArgError, "array size too big");
     }
 
     RUBY_DTRACE_CREATE_HOOK(ARRAY, capa);
@@ -888,11 +847,10 @@ ec_ary_new(rb_execution_context_t *ec, VALUE klass, long capa)
     }
     else {
         ary = ec_ary_alloc_heap(ec, klass);
-        assert(!ARY_EMBED_P(ary));
-
-        ptr = ary_heap_alloc(ary, capa);
-        ARY_SET_PTR(ary, ptr);
         ARY_SET_CAPA(ary, capa);
+        RUBY_ASSERT(!ARY_EMBED_P(ary));
+
+        ARY_SET_PTR(ary, ary_heap_alloc_buffer(capa));
         ARY_SET_HEAP_LEN(ary, 0);
     }
 
@@ -906,28 +864,26 @@ rb_ec_ary_new_from_values(rb_execution_context_t *ec, long n, const VALUE *elts)
 
     ary = ec_ary_new(ec, rb_cArray, n);
     if (n > 0 && elts) {
-	ary_memcpy(ary, 0, n, elts);
-	ARY_SET_LEN(ary, n);
+        ary_memcpy(ary, 0, n, elts);
+        ARY_SET_LEN(ary, n);
     }
 
     return ary;
 }
 
 VALUE
-rb_ary_tmp_new(long capa)
+rb_ary_hidden_new(long capa)
 {
     VALUE ary = ary_new(0, capa);
-    rb_ary_transient_heap_evacuate(ary, TRUE);
     return ary;
 }
 
 VALUE
-rb_ary_tmp_new_fill(long capa)
+rb_ary_hidden_new_fill(long capa)
 {
-    VALUE ary = ary_new(0, capa);
+    VALUE ary = rb_ary_hidden_new(capa);
     ary_memfill(ary, 0, capa, Qnil);
     ARY_SET_LEN(ary, capa);
-    rb_ary_transient_heap_evacuate(ary, TRUE);
     return ary;
 }
 
@@ -941,13 +897,8 @@ rb_ary_free(VALUE ary)
             RB_DEBUG_COUNTER_INC(obj_ary_extracapa);
         }
 
-        if (RARRAY_TRANSIENT_P(ary)) {
-            RB_DEBUG_COUNTER_INC(obj_ary_transient);
-        }
-        else {
-            RB_DEBUG_COUNTER_INC(obj_ary_ptr);
-            ary_heap_free(ary);
-        }
+        RB_DEBUG_COUNTER_INC(obj_ary_ptr);
+        ary_heap_free(ary);
     }
     else {
         RB_DEBUG_COUNTER_INC(obj_ary_embed);
@@ -961,68 +912,86 @@ rb_ary_free(VALUE ary)
     }
 }
 
-RUBY_FUNC_EXPORTED size_t
+static VALUE fake_ary_flags;
+
+static VALUE
+init_fake_ary_flags(void)
+{
+    struct RArray fake_ary = {0};
+    fake_ary.basic.flags = T_ARRAY;
+    VALUE ary = (VALUE)&fake_ary;
+    rb_ary_freeze(ary);
+    return fake_ary.basic.flags;
+}
+
+VALUE
+rb_setup_fake_ary(struct RArray *fake_ary, const VALUE *list, long len)
+{
+    fake_ary->basic.flags = fake_ary_flags;
+    RBASIC_CLEAR_CLASS((VALUE)fake_ary);
+
+    // bypass frozen checks
+    fake_ary->as.heap.ptr = list;
+    fake_ary->as.heap.len = len;
+    fake_ary->as.heap.aux.capa = len;
+    return (VALUE)fake_ary;
+}
+
+size_t
 rb_ary_memsize(VALUE ary)
 {
     if (ARY_OWNS_HEAP_P(ary)) {
-	return ARY_CAPA(ary) * sizeof(VALUE);
+        return ARY_CAPA(ary) * sizeof(VALUE);
     }
     else {
-	return 0;
+        return 0;
     }
 }
 
-static inline void
-ary_discard(VALUE ary)
-{
-    rb_ary_free(ary);
-    RBASIC(ary)->flags |= RARRAY_EMBED_FLAG;
-    RBASIC(ary)->flags &= ~(RARRAY_EMBED_LEN_MASK | RARRAY_TRANSIENT_FLAG);
-}
-
 static VALUE
 ary_make_shared(VALUE ary)
 {
-    assert(!ARY_EMBED_P(ary));
     ary_verify(ary);
 
     if (ARY_SHARED_P(ary)) {
         return ARY_SHARED_ROOT(ary);
     }
     else if (ARY_SHARED_ROOT_P(ary)) {
-	return ary;
+        return ary;
     }
     else if (OBJ_FROZEN(ary)) {
-        rb_ary_transient_heap_evacuate(ary, TRUE);
-	ary_shrink_capa(ary);
-	FL_SET_SHARED_ROOT(ary);
-        ARY_SET_SHARED_ROOT_REFCNT(ary, 1);
-	return ary;
+        return ary;
     }
     else {
-	long capa = ARY_CAPA(ary), len = RARRAY_LEN(ary);
-        const VALUE *ptr;
+        long capa = ARY_CAPA(ary);
+        long len = RARRAY_LEN(ary);
+
+        /* Shared roots cannot be embedded because the reference count
+         * (refcnt) is stored in as.heap.aux.capa. */
         VALUE shared = ary_alloc_heap(0);
-        VALUE vshared = (VALUE)shared;
-
-        rb_ary_transient_heap_evacuate(ary, TRUE);
-        ptr = ARY_HEAP_PTR(ary);
-
-        FL_UNSET_EMBED(vshared);
-        ARY_SET_LEN(vshared, capa);
-        ARY_SET_PTR(vshared, ptr);
-        ary_mem_clear(vshared, len, capa - len);
-        FL_SET_SHARED_ROOT(vshared);
-        ARY_SET_SHARED_ROOT_REFCNT(vshared, 1);
-	FL_SET_SHARED(ary);
-        RB_DEBUG_COUNTER_INC(obj_ary_shared_create);
-        ARY_SET_SHARED(ary, vshared);
-        OBJ_FREEZE(vshared);
-
-        ary_verify(vshared);
+        FL_SET_SHARED_ROOT(shared);
+
+        if (ARY_EMBED_P(ary)) {
+            VALUE *ptr = ary_heap_alloc_buffer(capa);
+            ARY_SET_PTR(shared, ptr);
+            ary_memcpy(shared, 0, len, RARRAY_CONST_PTR(ary));
+
+            FL_UNSET_EMBED(ary);
+            ARY_SET_HEAP_LEN(ary, len);
+            ARY_SET_PTR(ary, ptr);
+        }
+        else {
+            ARY_SET_PTR(shared, RARRAY_CONST_PTR(ary));
+        }
+
+        ARY_SET_LEN(shared, capa);
+        ary_mem_clear(shared, len, capa - len);
+        rb_ary_set_shared(ary, shared);
+
+        ary_verify(shared);
         ary_verify(ary);
 
-        return vshared;
+        return shared;
     }
 }
 
@@ -1033,9 +1002,9 @@ ary_make_substitution(VALUE ary)
 
     if (ary_embeddable_p(len)) {
         VALUE subst = rb_ary_new_capa(len);
-        assert(ARY_EMBED_P(subst));
+        RUBY_ASSERT(ARY_EMBED_P(subst));
 
-        ary_memcpy(subst, 0, len, RARRAY_CONST_PTR_TRANSIENT(ary));
+        ary_memcpy(subst, 0, len, RARRAY_CONST_PTR(ary));
         ARY_SET_EMBED_LEN(subst, len);
         return subst;
     }
@@ -1063,7 +1032,7 @@ rb_check_array_type(VALUE ary)
     return rb_check_convert_type_with_id(ary, T_ARRAY, "Array", idTo_ary);
 }
 
-MJIT_FUNC_EXPORTED VALUE
+VALUE
 rb_check_to_array(VALUE ary)
 {
     return rb_check_convert_type_with_id(ary, T_ARRAY, "Array", idTo_a);
@@ -1079,14 +1048,18 @@ rb_to_array(VALUE ary)
  *  call-seq:
  *    Array.try_convert(object) -> object, new_array, or nil
  *
- *  If +object+ is an \Array object, returns +object+.
+ *  Attempts to return an array, based on the given +object+.
  *
- *  Otherwise if +object+ responds to <tt>:to_ary</tt>,
- *  calls <tt>object.to_ary</tt> and returns the result.
+ *  If +object+ is an array, returns +object+.
  *
- *  Returns +nil+ if +object+ does not respond to <tt>:to_ary</tt>
+ *  Otherwise if +object+ responds to <tt>:to_ary</tt>.
+ *  calls <tt>object.to_ary</tt>:
+ *  if the return value is an array or +nil+, returns that value;
+ *  if not, raises TypeError.
  *
- *  Raises an exception unless <tt>object.to_ary</tt> returns an \Array object.
+ *  Otherwise returns +nil+.
+ *
+ *  Related: see {Methods for Creating an Array}[rdoc-ref:Array@Methods+for+Creating+an+Array].
  */
 
 static VALUE
@@ -1123,48 +1096,51 @@ rb_ary_s_new(int argc, VALUE *argv, VALUE klass)
  *  call-seq:
  *    Array.new -> new_empty_array
  *    Array.new(array) -> new_array
- *    Array.new(size) -> new_array
- *    Array.new(size, default_value) -> new_array
- *    Array.new(size) {|index| ... } -> new_array
+ *    Array.new(size, default_value = nil) -> new_array
+ *    Array.new(size = 0) {|index| ... } -> new_array
  *
- *  Returns a new \Array.
+ *  Returns a new array.
  *
- *  With no block and no arguments, returns a new empty \Array object.
+ *  With no block and no argument given, returns a new empty array:
  *
- *  With no block and a single \Array argument +array+,
- *  returns a new \Array formed from +array+:
+ *    Array.new # => []
  *
- *    a = Array.new([:foo, 'bar', 2])
- *    a.class # => Array
- *    a # => [:foo, "bar", 2]
+ *  With no block and array argument given, returns a new array with the same elements:
  *
- *  With no block and a single \Integer argument +size+,
- *  returns a new \Array of the given size
- *  whose elements are all +nil+:
+ *    Array.new([:foo, 'bar', 2]) # => [:foo, "bar", 2]
  *
- *    a = Array.new(3)
- *    a # => [nil, nil, nil]
+ *  With no block and integer argument given, returns a new array containing
+ *  that many instances of the given +default_value+:
  *
- *  With no block and arguments +size+ and +default_value+,
- *  returns an \Array of the given size;
- *  each element is that same +default_value+:
+ *    Array.new(0)    # => []
+ *    Array.new(3)    # => [nil, nil, nil]
+ *    Array.new(2, 3) # => [3, 3]
  *
- *    a = Array.new(3, 'x')
- *    a # => ['x', 'x', 'x']
+ *  With a block given, returns an array of the given +size+;
+ *  calls the block with each +index+ in the range <tt>(0...size)</tt>;
+ *  the element at that +index+ in the returned array is the blocks return value:
  *
- *  With a block and argument +size+,
- *  returns an \Array of the given size;
- *  the block is called with each successive integer +index+;
- *  the element for that +index+ is the return value from the block:
+ *    Array.new(3)  {|index| "Element #{index}" } # => ["Element 0", "Element 1", "Element 2"]
  *
- *    a = Array.new(3) {|index| "Element #{index}" }
- *    a # => ["Element 0", "Element 1", "Element 2"]
+ *  A common pitfall for new Rubyists is providing an expression as +default_value+:
  *
- *  Raises ArgumentError if +size+ is negative.
+ *    array = Array.new(2, {})
+ *    array # => [{}, {}]
+ *    array[0][:a] = 1
+ *    array # => [{a: 1}, {a: 1}], as array[0] and array[1] are same object
  *
- *  With a block and no argument,
- *  or a single argument +0+,
- *  ignores the block and returns a new empty \Array.
+ *  If you want the elements of the array to be distinct, you should pass a block:
+ *
+ *    array = Array.new(2) { {} }
+ *    array # => [{}, {}]
+ *    array[0][:a] = 1
+ *    array # => [{a: 1}, {}], as array[0] and array[1] are different objects
+ *
+ *  Raises TypeError if the first argument is not either an array
+ *  or an {integer-convertible object}[rdoc-ref:implicit_conversion.rdoc@Integer-Convertible+Objects]).
+ *  Raises ArgumentError if the first argument is a negative integer.
+ *
+ *  Related: see {Methods for Creating an Array}[rdoc-ref:Array@Methods+for+Creating+an+Array].
  */
 
 static VALUE
@@ -1176,57 +1152,59 @@ rb_ary_initialize(int argc, VALUE *argv, VALUE ary)
     rb_ary_modify(ary);
     if (argc == 0) {
         rb_ary_reset(ary);
-        assert(ARY_EMBED_P(ary));
-        assert(ARY_EMBED_LEN(ary) == 0);
-	if (rb_block_given_p()) {
-	    rb_warning("given block not used");
-	}
-	return ary;
+        RUBY_ASSERT(ARY_EMBED_P(ary));
+        RUBY_ASSERT(ARY_EMBED_LEN(ary) == 0);
+        if (rb_block_given_p()) {
+            rb_warning("given block not used");
+        }
+        return ary;
     }
     rb_scan_args(argc, argv, "02", &size, &val);
     if (argc == 1 && !FIXNUM_P(size)) {
-	val = rb_check_array_type(size);
-	if (!NIL_P(val)) {
-	    rb_ary_replace(ary, val);
-	    return ary;
-	}
+        val = rb_check_array_type(size);
+        if (!NIL_P(val)) {
+            rb_ary_replace(ary, val);
+            return ary;
+        }
     }
 
     len = NUM2LONG(size);
     /* NUM2LONG() may call size.to_int, ary can be frozen, modified, etc */
     if (len < 0) {
-	rb_raise(rb_eArgError, "negative array size");
+        rb_raise(rb_eArgError, "negative array size");
     }
     if (len > ARY_MAX_SIZE) {
-	rb_raise(rb_eArgError, "array size too big");
+        rb_raise(rb_eArgError, "array size too big");
     }
     /* recheck after argument conversion */
     rb_ary_modify(ary);
     ary_resize_capa(ary, len);
     if (rb_block_given_p()) {
-	long i;
+        long i;
 
-	if (argc == 2) {
-	    rb_warn("block supersedes default value argument");
-	}
-	for (i=0; i<len; i++) {
-	    rb_ary_store(ary, i, rb_yield(LONG2NUM(i)));
-	    ARY_SET_LEN(ary, i + 1);
-	}
+        if (argc == 2) {
+            rb_warn("block supersedes default value argument");
+        }
+        for (i=0; i<len; i++) {
+            rb_ary_store(ary, i, rb_yield(LONG2NUM(i)));
+            ARY_SET_LEN(ary, i + 1);
+        }
     }
     else {
-	ary_memfill(ary, 0, len, val);
-	ARY_SET_LEN(ary, len);
+        ary_memfill(ary, 0, len, val);
+        ARY_SET_LEN(ary, len);
     }
     return ary;
 }
 
 /*
- * Returns a new array populated with the given objects.
+ * Returns a new array, populated with the given objects:
+ *
+ *   Array[1, 'a', /^A/]    # => [1, "a", /^A/]
+ *   Array[]                # => []
+ *   Array.[](1, 'a', /^A/) # => [1, "a", /^A/]
  *
- *   Array.[]( 1, 'a', /^A/)  # => [1, "a", /^A/]
- *   Array[ 1, 'a', /^A/ ]    # => [1, "a", /^A/]
- *   [ 1, 'a', /^A/ ]         # => [1, "a", /^A/]
+ * Related: see {Methods for Creating an Array}[rdoc-ref:Array@Methods+for+Creating+an+Array].
  */
 
 static VALUE
@@ -1247,26 +1225,26 @@ rb_ary_store(VALUE ary, long idx, VALUE val)
     long len = RARRAY_LEN(ary);
 
     if (idx < 0) {
-	idx += len;
-	if (idx < 0) {
-	    rb_raise(rb_eIndexError, "index %ld too small for array; minimum: %ld",
-		     idx - len, -len);
-	}
+        idx += len;
+        if (idx < 0) {
+            rb_raise(rb_eIndexError, "index %ld too small for array; minimum: %ld",
+                     idx - len, -len);
+        }
     }
     else if (idx >= ARY_MAX_SIZE) {
-	rb_raise(rb_eIndexError, "index %ld too big", idx);
+        rb_raise(rb_eIndexError, "index %ld too big", idx);
     }
 
     rb_ary_modify(ary);
     if (idx >= ARY_CAPA(ary)) {
-	ary_double_capa(ary, idx);
+        ary_double_capa(ary, idx);
     }
     if (idx > len) {
-	ary_mem_clear(ary, len, idx - len + 1);
+        ary_mem_clear(ary, len, idx - len + 1);
     }
 
     if (idx >= len) {
-	ARY_SET_LEN(ary, idx + 1);
+        ARY_SET_LEN(ary, idx + 1);
     }
     ARY_SET(ary, idx, val);
 }
@@ -1274,22 +1252,26 @@ rb_ary_store(VALUE ary, long idx, VALUE val)
 static VALUE
 ary_make_partial(VALUE ary, VALUE klass, long offset, long len)
 {
-    assert(offset >= 0);
-    assert(len >= 0);
-    assert(offset+len <= RARRAY_LEN(ary));
+    RUBY_ASSERT(offset >= 0);
+    RUBY_ASSERT(len >= 0);
+    RUBY_ASSERT(offset+len <= RARRAY_LEN(ary));
 
-    if (ary_embeddable_p(len)) {
-        VALUE result = ary_alloc_embed(klass, len);
-        ary_memcpy(result, 0, len, RARRAY_CONST_PTR_TRANSIENT(ary) + offset);
+    VALUE result = ary_alloc_heap(klass);
+    size_t embed_capa = ary_embed_capa(result);
+    if ((size_t)len <= embed_capa) {
+        FL_SET_EMBED(result);
+        ary_memcpy(result, 0, len, RARRAY_CONST_PTR(ary) + offset);
         ARY_SET_EMBED_LEN(result, len);
-        return result;
     }
     else {
-        VALUE shared, result = ary_alloc_heap(klass);
-        assert(!ARY_EMBED_P(result));
+        VALUE shared = ary_make_shared(ary);
+
+        /* The ary_make_shared call may allocate, which can trigger a GC
+         * compaction. This can cause the array to be embedded because it has
+         * a length of 0. */
+        FL_UNSET_EMBED(result);
 
-        shared = ary_make_shared(ary);
-        ARY_SET_PTR(result, RARRAY_CONST_PTR_TRANSIENT(ary));
+        ARY_SET_PTR(result, RARRAY_CONST_PTR(ary));
         ARY_SET_LEN(result, RARRAY_LEN(ary));
         rb_ary_set_shared(result, shared);
 
@@ -1297,32 +1279,37 @@ ary_make_partial(VALUE ary, VALUE klass, long offset, long len)
         ARY_SET_LEN(result, len);
 
         ary_verify(shared);
-        ary_verify(result);
-        return result;
     }
+
+    ary_verify(result);
+    return result;
 }
 
 static VALUE
 ary_make_partial_step(VALUE ary, VALUE klass, long offset, long len, long step)
 {
-    assert(offset >= 0);
-    assert(len >= 0);
-    assert(offset+len <= RARRAY_LEN(ary));
-    assert(step != 0);
+    RUBY_ASSERT(offset >= 0);
+    RUBY_ASSERT(len >= 0);
+    RUBY_ASSERT(offset+len <= RARRAY_LEN(ary));
+    RUBY_ASSERT(step != 0);
 
-    const VALUE *values = RARRAY_CONST_PTR_TRANSIENT(ary);
     const long orig_len = len;
 
-    if ((step > 0 && step >= len) || (step < 0 && (step < -len))) {
+    if (step > 0 && step >= len) {
         VALUE result = ary_new(klass, 1);
         VALUE *ptr = (VALUE *)ARY_EMBED_PTR(result);
+        const VALUE *values = RARRAY_CONST_PTR(ary);
+
         RB_OBJ_WRITE(result, ptr, values[offset]);
         ARY_SET_EMBED_LEN(result, 1);
         return result;
     }
+    else if (step < 0 && step < -len) {
+        step = -len;
+    }
 
     long ustep = (step < 0) ? -step : step;
-    len = (len + ustep - 1) / ustep;
+    len = roomof(len, ustep);
 
     long i;
     long j = offset + ((step > 0) ? 0 : (orig_len - 1));
@@ -1330,6 +1317,8 @@ ary_make_partial_step(VALUE ary, VALUE klass, long offset, long len, long step)
     VALUE result = ary_new(klass, len);
     if (ARY_EMBED_P(result)) {
         VALUE *ptr = (VALUE *)ARY_EMBED_PTR(result);
+        const VALUE *values = RARRAY_CONST_PTR(ary);
+
         for (i = 0; i < len; ++i) {
             RB_OBJ_WRITE(result, ptr+i, values[j]);
             j += step;
@@ -1337,7 +1326,9 @@ ary_make_partial_step(VALUE ary, VALUE klass, long offset, long len, long step)
         ARY_SET_EMBED_LEN(result, len);
     }
     else {
-        RARRAY_PTR_USE_TRANSIENT(result, ptr, {
+        const VALUE *values = RARRAY_CONST_PTR(ary);
+
+        RARRAY_PTR_USE(result, ptr, {
             for (i = 0; i < len; ++i) {
                 RB_OBJ_WRITE(result, ptr+i, values[j]);
                 j += step;
@@ -1362,47 +1353,47 @@ enum ary_take_pos_flags
 };
 
 static VALUE
-ary_take_first_or_last(int argc, const VALUE *argv, VALUE ary, enum ary_take_pos_flags last)
+ary_take_first_or_last_n(VALUE ary, long n, enum ary_take_pos_flags last)
 {
-    long n;
-    long len;
+    long len = RARRAY_LEN(ary);
     long offset = 0;
 
-    argc = rb_check_arity(argc, 0, 1);
-    /* the case optional argument is omitted should be handled in
-     * callers of this function.  if another arity case is added,
-     * this arity check needs to rewrite. */
-    RUBY_ASSERT_ALWAYS(argc == 1);
-
-    n = NUM2LONG(argv[0]);
-    len = RARRAY_LEN(ary);
     if (n > len) {
-	n = len;
+        n = len;
     }
     else if (n < 0) {
-	rb_raise(rb_eArgError, "negative array size");
+        rb_raise(rb_eArgError, "negative array size");
     }
     if (last) {
-	offset = len - n;
+        offset = len - n;
     }
     return ary_make_partial(ary, rb_cArray, offset, n);
 }
 
+static VALUE
+ary_take_first_or_last(int argc, const VALUE *argv, VALUE ary, enum ary_take_pos_flags last)
+{
+    argc = rb_check_arity(argc, 0, 1);
+    /* the case optional argument is omitted should be handled in
+     * callers of this function.  if another arity case is added,
+     * this arity check needs to rewrite. */
+    RUBY_ASSERT_ALWAYS(argc == 1);
+    return ary_take_first_or_last_n(ary, NUM2LONG(argv[0]), last);
+}
+
 /*
  *  call-seq:
- *    array << object -> self
+ *    self << object -> self
  *
- *  Appends +object+ to +self+; returns +self+:
+ *  Appends +object+ as the last element in +self+; returns +self+:
  *
- *    a = [:foo, 'bar', 2]
- *    a << :baz # => [:foo, "bar", 2, :baz]
+ *    [:foo, 'bar', 2] << :baz # => [:foo, "bar", 2, :baz]
  *
- *  Appends +object+ as one element, even if it is another \Array:
+ *  Appends +object+ as a single element, even if it is another array:
  *
- *    a = [:foo, 'bar', 2]
- *    a1 = a << [3, 4]
- *    a1 # => [:foo, "bar", 2, [3, 4]]
+ *    [:foo, 'bar', 2] << [3, 4] # => [:foo, "bar", 2, [3, 4]]
  *
+ *  Related: see {Methods for Assigning}[rdoc-ref:Array@Methods+for+Assigning].
  */
 
 VALUE
@@ -1410,8 +1401,8 @@ rb_ary_push(VALUE ary, VALUE item)
 {
     long idx = RARRAY_LEN((ary_verify(ary), ary));
     VALUE target_ary = ary_ensure_room_for_push(ary, 1);
-    RARRAY_PTR_USE_TRANSIENT(ary, ptr, {
-	RB_OBJ_WRITE(target_ary, &ptr[idx], item);
+    RARRAY_PTR_USE(ary, ptr, {
+        RB_OBJ_WRITE(target_ary, &ptr[idx], item);
     });
     ARY_SET_LEN(ary, idx + 1);
     ary_verify(ary);
@@ -1430,24 +1421,20 @@ rb_ary_cat(VALUE ary, const VALUE *argv, long len)
 
 /*
  *  call-seq:
- *    array.push(*objects) -> self
- *
- *  Appends trailing elements.
+ *    push(*objects) -> self
+ *    append(*objects) -> self
  *
- *  Appends each argument in +objects+ to +self+;  returns +self+:
+ *  Appends each argument in +objects+ to +self+; returns +self+:
  *
- *    a = [:foo, 'bar', 2]
- *    a.push(:baz, :bat) # => [:foo, "bar", 2, :baz, :bat]
- *
- *  Appends each argument as one element, even if it is another \Array:
+ *    a = [:foo, 'bar', 2] # => [:foo, "bar", 2]
+ *    a.push(:baz, :bat)   # => [:foo, "bar", 2, :baz, :bat]
  *
- *    a = [:foo, 'bar', 2]
- *    a1 = a.push([:baz, :bat], [:bam, :bad])
- *    a1 # => [:foo, "bar", 2, [:baz, :bat], [:bam, :bad]]
+ *  Appends each argument as a single element, even if it is another array:
  *
- *  Array#append is an alias for Array#push.
+ *    a = [:foo, 'bar', 2]               # => [:foo, "bar", 2]
+      a.push([:baz, :bat], [:bam, :bad]) # => [:foo, "bar", 2, [:baz, :bat], [:bam, :bad]]
  *
- *  Related: #pop, #shift, #unshift.
+ *  Related: see {Methods for Assigning}[rdoc-ref:Array@Methods+for+Assigning].
  */
 
 static VALUE
@@ -1464,46 +1451,47 @@ rb_ary_pop(VALUE ary)
     n = RARRAY_LEN(ary);
     if (n == 0) return Qnil;
     if (ARY_OWNS_HEAP_P(ary) &&
-	n * 3 < ARY_CAPA(ary) &&
-	ARY_CAPA(ary) > ARY_DEFAULT_SIZE)
+        n * 3 < ARY_CAPA(ary) &&
+        ARY_CAPA(ary) > ARY_DEFAULT_SIZE)
     {
-	ary_resize_capa(ary, n * 2);
+        ary_resize_capa(ary, n * 2);
     }
-    --n;
-    ARY_SET_LEN(ary, n);
+
+    VALUE obj = RARRAY_AREF(ary, n - 1);
+
+    ARY_SET_LEN(ary, n - 1);
     ary_verify(ary);
-    return RARRAY_AREF(ary, n);
+    return obj;
 }
 
 /*
  *  call-seq:
- *    array.pop -> object or nil
- *    array.pop(n) -> new_array
+ *    pop -> object or nil
+ *    pop(count) -> new_array
  *
- *  Removes and returns trailing elements.
+ *  Removes and returns trailing elements of +self+.
  *
- *  When no argument is given and +self+ is not empty,
- *  removes and returns the last element:
+ *  With no argument given, removes and returns the last element, if available;
+ *  otherwise returns +nil+:
  *
  *    a = [:foo, 'bar', 2]
- *    a.pop # => 2
- *    a # => [:foo, "bar"]
+ *    a.pop  # => 2
+ *    a      # => [:foo, "bar"]
+ *    [].pop # => nil
  *
- *  Returns +nil+ if the array is empty.
+ *  With non-negative integer argument +count+ given,
+ *  returns a new array containing the trailing +count+ elements of +self+, as available:
  *
- *  When a non-negative \Integer argument +n+ is given and is in range,
- *
- *  removes and returns the last +n+ elements in a new \Array:
  *    a = [:foo, 'bar', 2]
  *    a.pop(2) # => ["bar", 2]
- *
- *  If +n+ is positive and out of range,
- *  removes and returns all elements:
+ *    a        # => [:foo]
  *
  *    a = [:foo, 'bar', 2]
  *    a.pop(50) # => [:foo, "bar", 2]
+ *    a         # => []
  *
- *  Related: #push, #shift, #unshift.
+ *  Related: Array#push;
+ *  see also {Methods for Deleting}[rdoc-ref:Array@Methods+for+Deleting].
  */
 
 static VALUE
@@ -1512,7 +1500,7 @@ rb_ary_pop_m(int argc, VALUE *argv, VALUE ary)
     VALUE result;
 
     if (argc == 0) {
-	return rb_ary_pop(ary);
+        return rb_ary_pop(ary);
     }
 
     rb_ary_modify_check(ary);
@@ -1542,35 +1530,40 @@ rb_ary_shift(VALUE ary)
 
 /*
  *  call-seq:
- *     array.shift -> object or nil
- *     array.shift(n) -> new_array
- *
- *  Removes and returns leading elements.
+ *    shift -> object or nil
+ *    shift(count) -> new_array or nil
  *
- *  When no argument is given, removes and returns the first element:
- *
- *    a = [:foo, 'bar', 2]
- *    a.shift # => :foo
- *    a # => ['bar', 2]
+ *  Removes and returns leading elements from +self+.
  *
- *  Returns +nil+ if +self+ is empty.
+ *  With no argument, removes and returns one element, if available,
+ *  or +nil+ otherwise:
  *
- *  When positive \Integer argument +n+ is given, removes the first +n+ elements;
- *  returns those elements in a new \Array:
+ *    a = [0, 1, 2, 3]
+ *    a.shift  # => 0
+ *    a        # => [1, 2, 3]
+ *    [].shift # => nil
  *
- *    a = [:foo, 'bar', 2]
- *    a.shift(2) # => [:foo, 'bar']
- *    a # => [2]
+ *  With non-negative numeric argument +count+ given,
+ *  removes and returns the first +count+ elements:
  *
- *  If +n+ is as large as or larger than <tt>self.length</tt>,
- *  removes all elements; returns those elements in a new \Array:
+ *    a = [0, 1, 2, 3]
+ *    a.shift(2)   # => [0, 1]
+ *    a            # => [2, 3]
+ *    a.shift(1.1) # => [2]
+ *    a            # => [3]
+ *    a.shift(0)   # => []
+ *    a            # => [3]
+ *
+ *  If +count+ is large,
+ *  removes and returns all elements:
  *
- *    a = [:foo, 'bar', 2]
- *    a.shift(3) # => [:foo, 'bar', 2]
+ *    a = [0, 1, 2, 3]
+ *    a.shift(50) # => [0, 1, 2, 3]
+ *    a           # => []
  *
- *  If +n+ is zero, returns a new empty \Array; +self+ is unmodified.
+ *  If +self+ is empty, returns a new empty array.
  *
- *  Related: #push, #pop, #unshift.
+ *  Related: see {Methods for Deleting}[rdoc-ref:Array@Methods+for+Deleting].
  */
 
 static VALUE
@@ -1580,7 +1573,7 @@ rb_ary_shift_m(int argc, VALUE *argv, VALUE ary)
     long n;
 
     if (argc == 0) {
-	return rb_ary_shift(ary);
+        return rb_ary_shift(ary);
     }
 
     rb_ary_modify_check(ary);
@@ -1591,7 +1584,7 @@ rb_ary_shift_m(int argc, VALUE *argv, VALUE ary)
     return result;
 }
 
-MJIT_FUNC_EXPORTED VALUE
+VALUE
 rb_ary_behead(VALUE ary, long n)
 {
     if (n <= 0) {
@@ -1602,7 +1595,7 @@ rb_ary_behead(VALUE ary, long n)
 
     if (!ARY_SHARED_P(ary)) {
         if (ARY_EMBED_P(ary) || RARRAY_LEN(ary) < ARY_DEFAULT_SIZE) {
-            RARRAY_PTR_USE_TRANSIENT(ary, ptr, {
+            RARRAY_PTR_USE(ary, ptr, {
                 MEMMOVE(ptr, ptr + n, VALUE, RARRAY_LEN(ary) - n);
             }); /* WB: no new reference */
             ARY_INCREASE_LEN(ary, -n);
@@ -1635,7 +1628,7 @@ make_room_for_unshift(VALUE ary, const VALUE *head, VALUE *sharedp, int argc, lo
         head = sharedp + argc + room;
     }
     ARY_SET_PTR(ary, head - argc);
-    assert(ARY_SHARED_ROOT_OCCUPIED(ARY_SHARED_ROOT(ary)));
+    RUBY_ASSERT(ARY_SHARED_ROOT_OCCUPIED(ARY_SHARED_ROOT(ary)));
 
     ary_verify(ary);
     return ARY_SHARED_ROOT(ary);
@@ -1652,7 +1645,7 @@ ary_modify_for_unshift(VALUE ary, int argc)
     rb_ary_modify(ary);
     capa = ARY_CAPA(ary);
     if (capa - (capa >> 6) <= new_len) {
-	ary_double_capa(ary, new_len);
+        ary_double_capa(ary, new_len);
     }
 
     /* use shared array for big "queues" */
@@ -1660,20 +1653,20 @@ ary_modify_for_unshift(VALUE ary, int argc)
         ary_verify(ary);
 
         /* make a room for unshifted items */
-	capa = ARY_CAPA(ary);
-	ary_make_shared(ary);
+        capa = ARY_CAPA(ary);
+        ary_make_shared(ary);
 
-        head = sharedp = RARRAY_CONST_PTR_TRANSIENT(ary);
+        head = sharedp = RARRAY_CONST_PTR(ary);
         return make_room_for_unshift(ary, head, (void *)sharedp, argc, capa, len);
     }
     else {
-	/* sliding items */
-        RARRAY_PTR_USE_TRANSIENT(ary, ptr, {
-	    MEMMOVE(ptr + argc, ptr, VALUE, len);
-	});
+        /* sliding items */
+        RARRAY_PTR_USE(ary, ptr, {
+            MEMMOVE(ptr + argc, ptr, VALUE, len);
+        });
 
         ary_verify(ary);
-	return ary;
+        return ary;
     }
 }
 
@@ -1700,8 +1693,8 @@ ary_ensure_room_for_unshift(VALUE ary, int argc)
             return ary_modify_for_unshift(ary, argc);
         }
         else {
-            const VALUE * head = RARRAY_CONST_PTR_TRANSIENT(ary);
-            void *sharedp = (void *)RARRAY_CONST_PTR_TRANSIENT(shared_root);
+            const VALUE * head = RARRAY_CONST_PTR(ary);
+            void *sharedp = (void *)RARRAY_CONST_PTR(shared_root);
 
             rb_ary_modify_check(ary);
             return make_room_for_unshift(ary, head, sharedp, argc, capa, len);
@@ -1711,27 +1704,27 @@ ary_ensure_room_for_unshift(VALUE ary, int argc)
 
 /*
  *  call-seq:
- *    array.unshift(*objects) -> self
+ *    unshift(*objects) -> self
+ *    prepend(*objects) -> self
  *
  *  Prepends the given +objects+ to +self+:
  *
  *    a = [:foo, 'bar', 2]
  *    a.unshift(:bam, :bat) # => [:bam, :bat, :foo, "bar", 2]
  *
- *  Array#prepend is an alias for Array#unshift.
- *
- *  Related: #push, #pop, #shift.
+ *  Related: Array#shift;
+ *  see also {Methods for Assigning}[rdoc-ref:Array@Methods+for+Assigning].
  */
 
-static VALUE
+VALUE
 rb_ary_unshift_m(int argc, VALUE *argv, VALUE ary)
 {
     long len = RARRAY_LEN(ary);
     VALUE target_ary;
 
     if (argc == 0) {
-	rb_ary_modify_check(ary);
-	return ary;
+        rb_ary_modify_check(ary);
+        return ary;
     }
 
     target_ary = ary_ensure_room_for_unshift(ary, argc);
@@ -1743,7 +1736,7 @@ rb_ary_unshift_m(int argc, VALUE *argv, VALUE ary)
 VALUE
 rb_ary_unshift(VALUE ary, VALUE item)
 {
-    return rb_ary_unshift_m(1,&item,ary);
+    return rb_ary_unshift_m(1, &item, ary);
 }
 
 /* faster version - use this if you don't need to treat negative offset */
@@ -1753,7 +1746,7 @@ rb_ary_elt(VALUE ary, long offset)
     long len = RARRAY_LEN(ary);
     if (len == 0) return Qnil;
     if (offset < 0 || len <= offset) {
-	return Qnil;
+        return Qnil;
     }
     return RARRAY_AREF(ary, offset);
 }
@@ -1774,7 +1767,7 @@ rb_ary_subseq_step(VALUE ary, long beg, long len, long step)
     if (beg < 0 || len < 0) return Qnil;
 
     if (alen < len || alen < beg + len) {
-	len = alen - beg;
+        len = alen - beg;
     }
     klass = rb_cArray;
     if (len == 0) return ary_new(klass, 0);
@@ -1796,25 +1789,38 @@ static VALUE rb_ary_aref2(VALUE ary, VALUE b, VALUE e);
 
 /*
  *  call-seq:
- *    array[index] -> object or nil
- *    array[start, length] -> object or nil
- *    array[range] -> object or nil
- *    array[aseq] -> object or nil
- *    array.slice(index) -> object or nil
- *    array.slice(start, length) -> object or nil
- *    array.slice(range) -> object or nil
- *    array.slice(aseq) -> object or nil
+ *    self[offset] -> object or nil
+ *    self[offset, size] -> object or nil
+ *    self[range] -> object or nil
+ *    self[aseq] -> object or nil
  *
  *  Returns elements from +self+; does not modify +self+.
  *
- *  When a single \Integer argument +index+ is given, returns the element at offset +index+:
+ *  In brief:
+ *
+ *    a = [:foo, 'bar', 2]
+ *
+ *    # Single argument offset: returns one element.
+ *    a[0]     # => :foo          # Zero-based index.
+ *    a[-1]    # => 2             # Negative index counts backwards from end.
+ *
+ *    # Arguments offset and size: returns an array.
+ *    a[1, 2]  # => ["bar", 2]
+ *    a[-2, 2] # => ["bar", 2]    # Negative offset counts backwards from end.
+ *
+ *    # Single argument range: returns an array.
+ *    a[0..1]  # => [:foo, "bar"]
+ *    a[0..-2] # => [:foo, "bar"] # Negative range-begin counts backwards from end.
+ *    a[-2..2] # => ["bar", 2]    # Negative range-end counts backwards from end.
+ *
+ *  When a single integer argument +offset+ is given, returns the element at offset +offset+:
  *
  *    a = [:foo, 'bar', 2]
  *    a[0] # => :foo
  *    a[2] # => 2
  *    a # => [:foo, "bar", 2]
  *
- *  If +index+ is negative, counts relative to the end of +self+:
+ *  If +offset+ is negative, counts backwards from the end of +self+:
  *
  *    a = [:foo, 'bar', 2]
  *    a[-1] # => 2
@@ -1822,35 +1828,35 @@ static VALUE rb_ary_aref2(VALUE ary, VALUE b, VALUE e);
  *
  *  If +index+ is out of range, returns +nil+.
  *
- *  When two \Integer arguments +start+ and +length+ are given,
- *  returns a new \Array of size +length+ containing successive elements beginning at offset +start+:
+ *  When two Integer arguments +offset+ and +size+ are given,
+ *  returns a new array of size +size+ containing successive elements beginning at offset +offset+:
  *
  *    a = [:foo, 'bar', 2]
  *    a[0, 2] # => [:foo, "bar"]
  *    a[1, 2] # => ["bar", 2]
  *
- *  If <tt>start + length</tt> is greater than <tt>self.length</tt>,
- *  returns all elements from offset +start+ to the end:
+ *  If <tt>offset + size</tt> is greater than <tt>self.size</tt>,
+ *  returns all elements from offset +offset+ to the end:
  *
  *    a = [:foo, 'bar', 2]
  *    a[0, 4] # => [:foo, "bar", 2]
  *    a[1, 3] # => ["bar", 2]
  *    a[2, 2] # => [2]
  *
- *  If <tt>start == self.size</tt> and <tt>length >= 0</tt>,
- *  returns a new empty \Array.
+ *  If <tt>offset == self.size</tt> and <tt>size >= 0</tt>,
+ *  returns a new empty array.
  *
- *  If +length+ is negative, returns +nil+.
+ *  If +size+ is negative, returns +nil+.
  *
- *  When a single \Range argument +range+ is given,
- *  treats <tt>range.min</tt> as +start+ above
- *  and <tt>range.size</tt> as +length+ above:
+ *  When a single Range argument +range+ is given,
+ *  treats <tt>range.min</tt> as +offset+ above
+ *  and <tt>range.size</tt> as +size+ above:
  *
  *    a = [:foo, 'bar', 2]
  *    a[0..1] # => [:foo, "bar"]
  *    a[1..2] # => ["bar", 2]
  *
- *  Special case: If <tt>range.start == a.size</tt>, returns a new empty \Array.
+ *  Special case: If <tt>range.start == a.size</tt>, returns a new empty array.
  *
  *  If <tt>range.end</tt> is negative, calculates the end index from the end:
  *
@@ -1874,7 +1880,7 @@ static VALUE rb_ary_aref2(VALUE ary, VALUE b, VALUE e);
  *    a[4..-1] # => nil
  *
  *  When a single Enumerator::ArithmeticSequence argument +aseq+ is given,
- *  returns an \Array of elements corresponding to the indexes produced by
+ *  returns an array of elements corresponding to the indexes produced by
  *  the sequence.
  *
  *    a = ['--', 'data1', '--', 'data2', '--', 'data3']
@@ -1896,7 +1902,7 @@ static VALUE rb_ary_aref2(VALUE ary, VALUE b, VALUE e);
  *    # Raises TypeError (no implicit conversion of Symbol into Integer):
  *    a[:foo]
  *
- *  Array#slice is an alias for Array#[].
+ *  Related: see {Methods for Fetching}[rdoc-ref:Array@Methods+for+Fetching].
  */
 
 VALUE
@@ -1904,7 +1910,7 @@ rb_ary_aref(int argc, const VALUE *argv, VALUE ary)
 {
     rb_check_arity(argc, 1, 2);
     if (argc == 2) {
-	return rb_ary_aref2(ary, argv[0], argv[1]);
+        return rb_ary_aref2(ary, argv[0], argv[1]);
     }
     return rb_ary_aref1(ary, argv[0]);
 }
@@ -1915,19 +1921,19 @@ rb_ary_aref2(VALUE ary, VALUE b, VALUE e)
     long beg = NUM2LONG(b);
     long len = NUM2LONG(e);
     if (beg < 0) {
-	beg += RARRAY_LEN(ary);
+        beg += RARRAY_LEN(ary);
     }
     return rb_ary_subseq(ary, beg, len);
 }
 
-MJIT_FUNC_EXPORTED VALUE
+VALUE
 rb_ary_aref1(VALUE ary, VALUE arg)
 {
     long beg, len, step;
 
     /* special case - speeding up */
     if (FIXNUM_P(arg)) {
-	return rb_ary_entry(ary, FIX2LONG(arg));
+        return rb_ary_entry(ary, FIX2LONG(arg));
     }
     /* check if idx is Range or ArithmeticSequence */
     switch (rb_arithmetic_sequence_beg_len_step(arg, &beg, &len, &step, RARRAY_LEN(ary), 0)) {
@@ -1944,13 +1950,26 @@ rb_ary_aref1(VALUE ary, VALUE arg)
 
 /*
  *  call-seq:
- *    array.at(index) -> object
+ *    at(index) -> object or nil
+ *
+ *  Returns the element of +self+ specified by the given +index+
+ *  or +nil+ if there is no such element;
+ *  +index+ must be an
+ *  {integer-convertible object}[rdoc-ref:implicit_conversion.rdoc@Integer-Convertible+Objects].
+ *
+ *  For non-negative +index+, returns the element of +self+ at offset +index+:
  *
- *  Returns the element at \Integer offset +index+; does not modify +self+.
  *    a = [:foo, 'bar', 2]
- *    a.at(0) # => :foo
- *    a.at(2) # => 2
+ *    a.at(0)   # => :foo
+ *    a.at(2)   # => 2
+ *    a.at(2.0) # => 2
+ *
+ *  For negative +index+, counts backwards from the end of +self+:
+ *
+ *    a.at(-2) # => "bar"
  *
+ *  Related: Array#[];
+ *  see also {Methods for Fetching}[rdoc-ref:Array@Methods+for+Fetching].
  */
 
 VALUE
@@ -1959,111 +1978,59 @@ rb_ary_at(VALUE ary, VALUE pos)
     return rb_ary_entry(ary, NUM2LONG(pos));
 }
 
-/*
- *  call-seq:
- *    array.first -> object or nil
- *    array.first(n) -> new_array
- *
- *  Returns elements from +self+; does not modify +self+.
- *
- *  When no argument is given, returns the first element:
- *
- *    a = [:foo, 'bar', 2]
- *    a.first # => :foo
- *    a # => [:foo, "bar", 2]
- *
- *  If +self+ is empty, returns +nil+.
- *
- *  When non-negative \Integer argument +n+ is given,
- *  returns the first +n+ elements in a new \Array:
- *
- *    a = [:foo, 'bar', 2]
- *    a.first(2) # => [:foo, "bar"]
- *
- *  If <tt>n >= array.size</tt>, returns all elements:
- *
- *    a = [:foo, 'bar', 2]
- *    a.first(50) # => [:foo, "bar", 2]
- *
- *  If <tt>n == 0</tt> returns an new empty \Array:
- *
- *    a = [:foo, 'bar', 2]
- *    a.first(0) # []
- *
- *  Related: #last.
- */
+#if 0
 static VALUE
 rb_ary_first(int argc, VALUE *argv, VALUE ary)
 {
     if (argc == 0) {
-	if (RARRAY_LEN(ary) == 0) return Qnil;
-	return RARRAY_AREF(ary, 0);
+        if (RARRAY_LEN(ary) == 0) return Qnil;
+        return RARRAY_AREF(ary, 0);
     }
     else {
-	return ary_take_first_or_last(argc, argv, ary, ARY_TAKE_FIRST);
+        return ary_take_first_or_last(argc, argv, ary, ARY_TAKE_FIRST);
     }
 }
+#endif
 
-/*
- *  call-seq:
- *    array.last  -> object or nil
- *    array.last(n) -> new_array
- *
- *  Returns elements from +self+; +self+ is not modified.
- *
- *  When no argument is given, returns the last element:
- *
- *    a = [:foo, 'bar', 2]
- *    a.last # => 2
- *    a # => [:foo, "bar", 2]
- *
- *  If +self+ is empty, returns +nil+.
- *
- *  When non-negative \Innteger argument +n+ is given,
- *  returns the last +n+ elements in a new \Array:
- *
- *    a = [:foo, 'bar', 2]
- *    a.last(2) # => ["bar", 2]
- *
- *  If <tt>n >= array.size</tt>, returns all elements:
- *
- *    a = [:foo, 'bar', 2]
- *    a.last(50) # => [:foo, "bar", 2]
- *
- *  If <tt>n == 0</tt>, returns an new empty \Array:
- *
- *    a = [:foo, 'bar', 2]
- *    a.last(0) # []
- *
- *  Related: #first.
- */
+static VALUE
+ary_first(VALUE self)
+{
+    return (RARRAY_LEN(self) == 0) ? Qnil : RARRAY_AREF(self, 0);
+}
+
+static VALUE
+ary_last(VALUE self)
+{
+    long len = RARRAY_LEN(self);
+    return (len == 0) ? Qnil : RARRAY_AREF(self, len-1);
+}
 
 VALUE
-rb_ary_last(int argc, const VALUE *argv, VALUE ary)
+rb_ary_last(int argc, const VALUE *argv, VALUE ary) // used by parse.y
 {
     if (argc == 0) {
-	long len = RARRAY_LEN(ary);
-	if (len == 0) return Qnil;
-	return RARRAY_AREF(ary, len-1);
+        return ary_last(ary);
     }
     else {
-	return ary_take_first_or_last(argc, argv, ary, ARY_TAKE_LAST);
+        return ary_take_first_or_last(argc, argv, ary, ARY_TAKE_LAST);
     }
 }
 
 /*
  *  call-seq:
- *    array.fetch(index) -> element
- *    array.fetch(index, default_value) -> element
- *    array.fetch(index) {|index| ... } -> element
+ *    fetch(index) -> element
+ *    fetch(index, default_value) -> element or default_value
+ *    fetch(index) {|index| ... } -> element or block_return_value
  *
- *  Returns the element at offset  +index+.
+ *  Returns the element of +self+ at offset +index+ if +index+ is in range; +index+ must be an
+ *  {integer-convertible object}[rdoc-ref:implicit_conversion.rdoc@Integer-Convertible+Objects].
  *
- *  With the single \Integer argument +index+,
+ *  With the single argument +index+ and no block,
  *  returns the element at offset +index+:
  *
  *    a = [:foo, 'bar', 2]
- *    a.fetch(1) # => "bar"
+ *    a.fetch(1)   # => "bar"
+ *    a.fetch(1.1) # => "bar"
  *
  *  If +index+ is negative, counts from the end of the array:
  *
@@ -2071,12 +2038,12 @@ rb_ary_last(int argc, const VALUE *argv, VALUE ary)
  *    a.fetch(-1) # => 2
  *    a.fetch(-2) # => "bar"
  *
- *  With arguments +index+ and +default_value+,
- *  returns the element at offset +index+ if index is in range,
- *  otherwise returns +default_value+:
+ *  With arguments +index+ and +default_value+ (which may be any object) and no block,
+ *  returns +default_value+ if +index+ is out-of-range:
  *
  *    a = [:foo, 'bar', 2]
- *    a.fetch(1, nil) # => "bar"
+ *    a.fetch(1, nil)  # => "bar"
+ *    a.fetch(3, :foo) # => :foo
  *
  *  With argument +index+ and a block,
  *  returns the element at offset +index+ if index is in range
@@ -2086,6 +2053,7 @@ rb_ary_last(int argc, const VALUE *argv, VALUE ary)
  *    a.fetch(1) {|index| raise 'Cannot happen' } # => "bar"
  *    a.fetch(50) {|index| "Value for #{index}" } # => "Value for 50"
  *
+ *  Related: see {Methods for Fetching}[rdoc-ref:Array@Methods+for+Fetching].
  */
 
 static VALUE
@@ -2098,33 +2066,125 @@ rb_ary_fetch(int argc, VALUE *argv, VALUE ary)
     rb_scan_args(argc, argv, "11", &pos, &ifnone);
     block_given = rb_block_given_p();
     if (block_given && argc == 2) {
-	rb_warn("block supersedes default value argument");
+        rb_warn("block supersedes default value argument");
     }
     idx = NUM2LONG(pos);
 
     if (idx < 0) {
-	idx +=  RARRAY_LEN(ary);
+        idx +=  RARRAY_LEN(ary);
     }
     if (idx < 0 || RARRAY_LEN(ary) <= idx) {
-	if (block_given) return rb_yield(pos);
-	if (argc == 1) {
-	    rb_raise(rb_eIndexError, "index %ld outside of array bounds: %ld...%ld",
-			idx - (idx < 0 ? RARRAY_LEN(ary) : 0), -RARRAY_LEN(ary), RARRAY_LEN(ary));
-	}
-	return ifnone;
+        if (block_given) return rb_yield(pos);
+        if (argc == 1) {
+            rb_raise(rb_eIndexError, "index %ld outside of array bounds: %ld...%ld",
+                        idx - (idx < 0 ? RARRAY_LEN(ary) : 0), -RARRAY_LEN(ary), RARRAY_LEN(ary));
+        }
+        return ifnone;
     }
     return RARRAY_AREF(ary, idx);
 }
 
 /*
+ * call-seq:
+ *   find(if_none_proc = nil) {|element| ... } -> object or nil
+ *   find(if_none_proc = nil) -> enumerator
+ *
+ * Returns the first element for which the block returns a truthy value.
+ *
+ * With a block given, calls the block with successive elements of the array;
+ * returns the first element for which the block returns a truthy value:
+ *
+ *   [1, 3, 5].find {|element| element > 2}                # => 3
+ *
+ * If no such element is found, calls +if_none_proc+ and returns its return value.
+ *
+ *   [1, 3, 5].find(proc {-1}) {|element| element > 12} # => -1
+ *
+ * With no block given, returns an Enumerator.
+ *
+ */
+
+static VALUE
+rb_ary_find(int argc, VALUE *argv, VALUE ary)
+{
+    VALUE if_none;
+    long idx;
+
+    RETURN_ENUMERATOR(ary, argc, argv);
+    if_none = rb_check_arity(argc, 0, 1) ? argv[0] : Qnil;
+
+    for (idx = 0; idx < RARRAY_LEN(ary); idx++) {
+        VALUE elem = RARRAY_AREF(ary, idx);
+        if (RTEST(rb_yield(elem))) {
+            return elem;
+        }
+    }
+
+    if (!NIL_P(if_none)) {
+        return rb_funcallv(if_none, idCall, 0, 0);
+    }
+    return Qnil;
+}
+
+/*
+ * call-seq:
+ *   rfind(if_none_proc = nil) {|element| ... } -> object or nil
+ *   rfind(if_none_proc = nil) -> enumerator
+ *
+ * Returns the last element for which the block returns a truthy value.
+ *
+ * With a block given, calls the block with successive elements of the array in
+ * reverse order; returns the first element for which the block returns a truthy
+ * value:
+ *
+ *   [1, 2, 3, 4, 5, 6].rfind {|element| element < 5}       # => 4
+ *
+ * If no such element is found, calls +if_none_proc+ and returns its return value.
+ *
+ *   [1, 2, 3, 4].rfind(proc {0}) {|element| element < -2}  # => 0
+ *
+ * With no block given, returns an Enumerator.
+ *
+ */
+
+static VALUE
+rb_ary_rfind(int argc, VALUE *argv, VALUE ary)
+{
+    VALUE if_none;
+    long len, idx;
+
+    RETURN_ENUMERATOR(ary, argc, argv);
+    if_none = rb_check_arity(argc, 0, 1) ? argv[0] : Qnil;
+
+    idx = RARRAY_LEN(ary);
+    while (idx--) {
+        VALUE elem = RARRAY_AREF(ary, idx);
+        if (RTEST(rb_yield(elem))) {
+            return elem;
+        }
+
+        len = RARRAY_LEN(ary);
+        idx = (idx >= len) ? len : idx;
+    }
+
+    if (!NIL_P(if_none)) {
+        return rb_funcallv(if_none, idCall, 0, 0);
+    }
+    return Qnil;
+}
+
+/*
  *  call-seq:
- *    array.index(object) -> integer or nil
- *    array.index {|element| ... } -> integer or nil
- *    array.index -> new_enumerator
+ *    find_index(object) -> integer or nil
+ *    find_index {|element| ... } -> integer or nil
+ *    find_index -> new_enumerator
+ *    index(object) -> integer or nil
+ *    index {|element| ... } -> integer or nil
+ *    index -> new_enumerator
  *
- *  Returns the index of a specified element.
+ *  Returns the zero-based integer index of a specified element, or +nil+.
  *
- *  When argument +object+ is given but no block,
+ *  With only argument +object+ given,
  *  returns the index of the first element +element+
  *  for which <tt>object == element</tt>:
  *
@@ -2133,7 +2193,7 @@ rb_ary_fetch(int argc, VALUE *argv, VALUE ary)
  *
  *  Returns +nil+ if no such element found.
  *
- *  When both argument +object+ and a block are given,
+ *  With only a block given,
  *  calls the block with each successive element;
  *  returns the index of the first element for which the block returns a truthy value:
  *
@@ -2142,16 +2202,9 @@ rb_ary_fetch(int argc, VALUE *argv, VALUE ary)
  *
  *  Returns +nil+ if the block never returns a truthy value.
  *
- *  When neither an argument nor a block is given, returns a new Enumerator:
- *
- *    a = [:foo, 'bar', 2]
- *    e = a.index
- *    e # => #<Enumerator: [:foo, "bar", 2]:index>
- *    e.each {|element| element == 'bar' } # => 1
- *
- *  Array#find_index is an alias for Array#index.
+ *  With neither an argument nor a block given, returns a new Enumerator.
  *
- *  Related: #rindex.
+ *  Related: see {Methods for Querying}[rdoc-ref:Array@Methods+for+Querying].
  */
 
 static VALUE
@@ -2161,43 +2214,43 @@ rb_ary_index(int argc, VALUE *argv, VALUE ary)
     long i;
 
     if (argc == 0) {
-	RETURN_ENUMERATOR(ary, 0, 0);
-	for (i=0; i<RARRAY_LEN(ary); i++) {
-	    if (RTEST(rb_yield(RARRAY_AREF(ary, i)))) {
-		return LONG2NUM(i);
-	    }
-	}
-	return Qnil;
+        RETURN_ENUMERATOR(ary, 0, 0);
+        for (i=0; i<RARRAY_LEN(ary); i++) {
+            if (RTEST(rb_yield(RARRAY_AREF(ary, i)))) {
+                return LONG2NUM(i);
+            }
+        }
+        return Qnil;
     }
     rb_check_arity(argc, 0, 1);
     val = argv[0];
     if (rb_block_given_p())
-	rb_warn("given block not used");
+        rb_warn("given block not used");
     for (i=0; i<RARRAY_LEN(ary); i++) {
-	VALUE e = RARRAY_AREF(ary, i);
-	if (rb_equal(e, val)) {
-	    return LONG2NUM(i);
-	}
+        VALUE e = RARRAY_AREF(ary, i);
+        if (rb_equal(e, val)) {
+            return LONG2NUM(i);
+        }
     }
     return Qnil;
 }
 
 /*
  *  call-seq:
- *    array.rindex(object) -> integer or nil
- *    array.rindex {|element| ... } -> integer or nil
- *    array.rindex -> new_enumerator
+ *    rindex(object) -> integer or nil
+ *    rindex {|element| ... } -> integer or nil
+ *    rindex -> new_enumerator
  *
  *  Returns the index of the last element for which <tt>object == element</tt>.
  *
- *  When argument +object+ is given but no block, returns the index of the last such element found:
+ *  With argument +object+ given, returns the index of the last such element found:
  *
  *    a = [:foo, 'bar', 2, 'bar']
  *    a.rindex('bar') # => 3
  *
  *  Returns +nil+ if no such object found.
  *
- *  When a block is given but no argument, calls the block with each successive element;
+ *  With a block given, calls the block with each successive element;
  *  returns the index of the last element for which the block returns a truthy value:
  *
  *    a = [:foo, 'bar', 2, 'bar']
@@ -2205,14 +2258,9 @@ rb_ary_index(int argc, VALUE *argv, VALUE ary)
  *
  *  Returns +nil+ if the block never returns a truthy value.
  *
- *  When neither an argument nor a block is given, returns a new \Enumerator:
- *
- *    a = [:foo, 'bar', 2, 'bar']
- *    e = a.rindex
- *    e # => #<Enumerator: [:foo, "bar", 2, "bar"]:rindex>
- *    e.each {|element| element == 'bar' } # => 3
+ *  When neither an argument nor a block is given, returns a new Enumerator.
  *
- *  Related: #index.
+ *  Related: see {Methods for Querying}[rdoc-ref:Array@Methods+for+Querying].
  */
 
 static VALUE
@@ -2222,25 +2270,25 @@ rb_ary_rindex(int argc, VALUE *argv, VALUE ary)
     long i = RARRAY_LEN(ary), len;
 
     if (argc == 0) {
-	RETURN_ENUMERATOR(ary, 0, 0);
-	while (i--) {
-	    if (RTEST(rb_yield(RARRAY_AREF(ary, i))))
-		return LONG2NUM(i);
-	    if (i > (len = RARRAY_LEN(ary))) {
-		i = len;
-	    }
-	}
-	return Qnil;
+        RETURN_ENUMERATOR(ary, 0, 0);
+        while (i--) {
+            if (RTEST(rb_yield(RARRAY_AREF(ary, i))))
+                return LONG2NUM(i);
+            if (i > (len = RARRAY_LEN(ary))) {
+                i = len;
+            }
+        }
+        return Qnil;
     }
     rb_check_arity(argc, 0, 1);
     val = argv[0];
     if (rb_block_given_p())
-	rb_warn("given block not used");
+        rb_warn("given block not used");
     while (i--) {
-	VALUE e = RARRAY_AREF(ary, i);
-	if (rb_equal(e, val)) {
-	    return LONG2NUM(i);
-	}
+        VALUE e = RARRAY_AREF(ary, i);
+        if (rb_equal(e, val)) {
+            return LONG2NUM(i);
+        }
         if (i > RARRAY_LEN(ary)) {
             break;
         }
@@ -2266,64 +2314,69 @@ rb_ary_splice(VALUE ary, long beg, long len, const VALUE *rptr, long rlen)
     if (len < 0) rb_raise(rb_eIndexError, "negative length (%ld)", len);
     olen = RARRAY_LEN(ary);
     if (beg < 0) {
-	beg += olen;
-	if (beg < 0) {
-	    rb_raise(rb_eIndexError, "index %ld too small for array; minimum: %ld",
-		     beg - olen, -olen);
-	}
+        beg += olen;
+        if (beg < 0) {
+            rb_raise(rb_eIndexError, "index %ld too small for array; minimum: %ld",
+                     beg - olen, -olen);
+        }
     }
     if (olen < len || olen < beg + len) {
-	len = olen - beg;
+        len = olen - beg;
     }
 
     {
-        const VALUE *optr = RARRAY_CONST_PTR_TRANSIENT(ary);
-	rofs = (rptr >= optr && rptr < optr + olen) ? rptr - optr : -1;
+        const VALUE *optr = RARRAY_CONST_PTR(ary);
+        rofs = (rptr >= optr && rptr < optr + olen) ? rptr - optr : -1;
     }
 
     if (beg >= olen) {
-	VALUE target_ary;
-	if (beg > ARY_MAX_SIZE - rlen) {
-	    rb_raise(rb_eIndexError, "index %ld too big", beg);
-	}
-	target_ary = ary_ensure_room_for_push(ary, rlen-len); /* len is 0 or negative */
-	len = beg + rlen;
-	ary_mem_clear(ary, olen, beg - olen);
-	if (rlen > 0) {
-            if (rofs != -1) rptr = RARRAY_CONST_PTR_TRANSIENT(ary) + rofs;
-	    ary_memcpy0(ary, beg, rlen, rptr, target_ary);
-	}
-	ARY_SET_LEN(ary, len);
+        VALUE target_ary;
+        if (beg > ARY_MAX_SIZE - rlen) {
+            rb_raise(rb_eIndexError, "index %ld too big", beg);
+        }
+        target_ary = ary_ensure_room_for_push(ary, rlen-len); /* len is 0 or negative */
+        len = beg + rlen;
+        ary_mem_clear(ary, olen, beg - olen);
+        if (rlen > 0) {
+            if (rofs != -1) rptr = RARRAY_CONST_PTR(ary) + rofs;
+            ary_memcpy0(ary, beg, rlen, rptr, target_ary);
+        }
+        ARY_SET_LEN(ary, len);
     }
     else {
-	long alen;
-
-	if (olen - len > ARY_MAX_SIZE - rlen) {
-	    rb_raise(rb_eIndexError, "index %ld too big", olen + rlen - len);
-	}
-	rb_ary_modify(ary);
-	alen = olen + rlen - len;
-	if (alen >= ARY_CAPA(ary)) {
-	    ary_double_capa(ary, alen);
-	}
-
-	if (len != rlen) {
-            RARRAY_PTR_USE_TRANSIENT(ary, ptr,
+        long alen;
+
+        if (olen - len > ARY_MAX_SIZE - rlen) {
+            rb_raise(rb_eIndexError, "index %ld too big", olen + rlen - len);
+        }
+        rb_ary_modify(ary);
+        alen = olen + rlen - len;
+        if (alen >= ARY_CAPA(ary)) {
+            ary_double_capa(ary, alen);
+        }
+
+        if (len != rlen) {
+            RARRAY_PTR_USE(ary, ptr,
                                      MEMMOVE(ptr + beg + rlen, ptr + beg + len,
                                              VALUE, olen - (beg + len)));
-	    ARY_SET_LEN(ary, alen);
-	}
-	if (rlen > 0) {
-            if (rofs != -1) rptr = RARRAY_CONST_PTR_TRANSIENT(ary) + rofs;
-            /* give up wb-protected ary */
-            RB_OBJ_WB_UNPROTECT_FOR(ARRAY, ary);
+            ARY_SET_LEN(ary, alen);
+        }
+        if (rlen > 0) {
+            if (rofs == -1) {
+                rb_gc_writebarrier_remember(ary);
+            }
+            else {
+                /* In this case, we're copying from a region in this array, so
+                 * we don't need to fire the write barrier. */
+                rptr = RARRAY_CONST_PTR(ary) + rofs;
+            }
 
             /* do not use RARRAY_PTR() because it can causes GC.
              * ary can contain T_NONE object because it is not cleared.
              */
-            RARRAY_PTR_USE_TRANSIENT(ary, ptr,
+            RARRAY_PTR_USE(ary, ptr,
                                      MEMMOVE(ptr + beg, rptr, VALUE, rlen));
-	}
+        }
     }
 }
 
@@ -2334,10 +2387,10 @@ rb_ary_set_len(VALUE ary, long len)
 
     rb_ary_modify_check(ary);
     if (ARY_SHARED_P(ary)) {
-	rb_raise(rb_eRuntimeError, "can't set length of shared ");
+        rb_raise(rb_eRuntimeError, "can't set length of shared ");
     }
     if (len > (capa = (long)ARY_CAPA(ary))) {
-	rb_bug("probable buffer overflow: %ld for %ld", len, capa);
+        rb_bug("probable buffer overflow: %ld for %ld", len, capa);
     }
     ARY_SET_LEN(ary, len);
 }
@@ -2351,14 +2404,14 @@ rb_ary_resize(VALUE ary, long len)
     olen = RARRAY_LEN(ary);
     if (len == olen) return ary;
     if (len > ARY_MAX_SIZE) {
-	rb_raise(rb_eIndexError, "index %ld too big", len);
+        rb_raise(rb_eIndexError, "index %ld too big", len);
     }
     if (len > olen) {
-	if (len >= ARY_CAPA(ary)) {
-	    ary_double_capa(ary, len);
-	}
-	ary_mem_clear(ary, olen, len - olen);
-	ARY_SET_LEN(ary, len);
+        if (len > ARY_CAPA(ary)) {
+            ary_double_capa(ary, len);
+        }
+        ary_mem_clear(ary, olen, len - olen);
+        ARY_SET_LEN(ary, len);
     }
     else if (ARY_EMBED_P(ary)) {
         ARY_SET_EMBED_LEN(ary, len);
@@ -2366,9 +2419,8 @@ rb_ary_resize(VALUE ary, long len)
     else if (len <= ary_embed_capa(ary)) {
         const VALUE *ptr = ARY_HEAP_PTR(ary);
         long ptr_capa = ARY_HEAP_SIZE(ary);
-        bool is_malloc_ptr = !ARY_SHARED_P(ary) && !RARRAY_TRANSIENT_P(ary);
+        bool is_malloc_ptr = !ARY_SHARED_P(ary);
 
-        FL_UNSET(ary, RARRAY_TRANSIENT_FLAG);
         FL_SET_EMBED(ary);
 
         MEMCPY((VALUE *)ARY_EMBED_PTR(ary), ptr, VALUE, len); /* WB: no new reference */
@@ -2377,11 +2429,11 @@ rb_ary_resize(VALUE ary, long len)
         if (is_malloc_ptr) ruby_sized_xfree((void *)ptr, ptr_capa);
     }
     else {
-	if (olen > len + ARY_DEFAULT_SIZE) {
+        if (olen > len + ARY_DEFAULT_SIZE) {
             size_t new_capa = ary_heap_realloc(ary, len);
             ARY_SET_CAPA(ary, new_capa);
-	}
-	ARY_SET_HEAP_LEN(ary, len);
+        }
+        ARY_SET_HEAP_LEN(ary, len);
     }
     ary_verify(ary);
     return ary;
@@ -2398,20 +2450,48 @@ static VALUE
 ary_aset_by_rb_ary_splice(VALUE ary, long beg, long len, VALUE val)
 {
     VALUE rpl = rb_ary_to_ary(val);
-    rb_ary_splice(ary, beg, len, RARRAY_CONST_PTR_TRANSIENT(rpl), RARRAY_LEN(rpl));
+    rb_ary_splice(ary, beg, len, RARRAY_CONST_PTR(rpl), RARRAY_LEN(rpl));
     RB_GC_GUARD(rpl);
     return val;
 }
 
 /*
  *  call-seq:
- *    array[index] = object -> object
- *    array[start, length] = object -> object
- *    array[range] = object -> object
- *
- *  Assigns elements in +self+; returns the given +object+.
- *
- *  When \Integer argument +index+ is given, assigns +object+ to an element in +self+.
+ *    self[index] = object -> object
+ *    self[start, length] = object -> object
+ *    self[range] = object -> object
+ *
+ *  Assigns elements in +self+, based on the given +object+; returns +object+.
+ *
+ *  In brief:
+ *
+ *      a_orig = [:foo, 'bar', 2]
+ *
+ *      # With argument index.
+ *      a = a_orig.dup
+ *      a[0] = 'foo' # => "foo"
+ *      a # => ["foo", "bar", 2]
+ *      a = a_orig.dup
+ *      a[7] = 'foo' # => "foo"
+ *      a # => [:foo, "bar", 2, nil, nil, nil, nil, "foo"]
+ *
+ *      # With arguments start and length.
+ *      a = a_orig.dup
+ *      a[0, 2] = 'foo' # => "foo"
+ *      a # => ["foo", 2]
+ *      a = a_orig.dup
+ *      a[6, 50] = 'foo' # => "foo"
+ *      a # => [:foo, "bar", 2, nil, nil, nil, "foo"]
+ *
+ *      # With argument range.
+ *      a = a_orig.dup
+ *      a[0..1] = 'foo' # => "foo"
+ *      a # => ["foo", 2]
+ *      a = a_orig.dup
+ *      a[6..50] = 'foo' # => "foo"
+ *      a # => [:foo, "bar", 2, nil, nil, nil, "foo"]
+ *
+ *  When Integer argument +index+ is given, assigns +object+ to an element in +self+.
  *
  *  If +index+ is non-negative, assigns +object+ the element at offset +index+:
  *
@@ -2431,7 +2511,7 @@ ary_aset_by_rb_ary_splice(VALUE ary, long beg, long len, VALUE val)
  *    a[-1] = 'two' # => "two"
  *    a # => [:foo, "bar", "two"]
  *
- *  When \Integer arguments +start+ and +length+ are given and +object+ is not an \Array,
+ *  When Integer arguments +start+ and +length+ are given and +object+ is not an array,
  *  removes <tt>length - 1</tt> elements beginning at offset +start+,
  *  and assigns +object+ at offset +start+:
  *
@@ -2466,7 +2546,7 @@ ary_aset_by_rb_ary_splice(VALUE ary, long beg, long len, VALUE val)
  *    a[1, 5] = 'foo' # => "foo"
  *    a # => [:foo, "foo"]
  *
- *  When \Range argument +range+ is given and +object+ is an \Array,
+ *  When Range argument +range+ is given and +object+ is not an array,
  *  removes <tt>length - 1</tt> elements beginning at offset +start+,
  *  and assigns +object+ at offset +start+:
  *
@@ -2481,7 +2561,8 @@ ary_aset_by_rb_ary_splice(VALUE ary, long beg, long len, VALUE val)
  *    a # => [:foo, "foo"]
  *
  *  If the array length is less than <tt>range.begin</tt>,
- *  assigns +object+ at offset <tt>range.begin</tt>, and ignores +length+:
+ *  extends the array with +nil+, assigns +object+ at offset <tt>range.begin</tt>,
+ *  and ignores +length+:
  *
  *    a = [:foo, 'bar', 2]
  *    a[6..50] = 'foo' # => "foo"
@@ -2515,6 +2596,7 @@ ary_aset_by_rb_ary_splice(VALUE ary, long beg, long len, VALUE val)
  *    a[1..5] = 'foo' # => "foo"
  *    a # => [:foo, "foo"]
  *
+ *  Related: see {Methods for Assigning}[rdoc-ref:Array@Methods+for+Assigning].
  */
 
 static VALUE
@@ -2525,16 +2607,16 @@ rb_ary_aset(int argc, VALUE *argv, VALUE ary)
     rb_check_arity(argc, 2, 3);
     rb_ary_modify_check(ary);
     if (argc == 3) {
-	beg = NUM2LONG(argv[0]);
-	len = NUM2LONG(argv[1]);
+        beg = NUM2LONG(argv[0]);
+        len = NUM2LONG(argv[1]);
         return ary_aset_by_rb_ary_splice(ary, beg, len, argv[2]);
     }
     if (FIXNUM_P(argv[0])) {
-	offset = FIX2LONG(argv[0]);
+        offset = FIX2LONG(argv[0]);
         return ary_aset_by_rb_ary_store(ary, offset, argv[1]);
     }
     if (rb_range_beg_len(argv[0], &beg, &len, RARRAY_LEN(ary), 1)) {
-	/* check if idx is Range */
+        /* check if idx is Range */
         return ary_aset_by_rb_ary_splice(ary, beg, len, argv[1]);
     }
 
@@ -2544,38 +2626,38 @@ rb_ary_aset(int argc, VALUE *argv, VALUE ary)
 
 /*
  *  call-seq:
- *    array.insert(index, *objects) -> self
+ *    insert(index, *objects) -> self
  *
- *  Inserts given +objects+ before or after the element at \Integer index +offset+;
+ *  Inserts the given +objects+ as elements of +self+;
  *  returns +self+.
  *
- *  When +index+ is non-negative, inserts all given +objects+
- *  before the element at offset +index+:
+ *  When +index+ is non-negative, inserts +objects+
+ *  _before_ the element at offset +index+:
  *
- *    a = [:foo, 'bar', 2]
- *    a.insert(1, :bat, :bam) # => [:foo, :bat, :bam, "bar", 2]
+ *    a = ['a', 'b', 'c']     # => ["a", "b", "c"]
+ *    a.insert(1, :x, :y, :z) # => ["a", :x, :y, :z, "b", "c"]
  *
  *  Extends the array if +index+ is beyond the array (<tt>index >= self.size</tt>):
  *
- *    a = [:foo, 'bar', 2]
- *    a.insert(5, :bat, :bam)
- *    a # => [:foo, "bar", 2, nil, nil, :bat, :bam]
+ *    a = ['a', 'b', 'c']     # => ["a", "b", "c"]
+ *    a.insert(5, :x, :y, :z) # => ["a", "b", "c", nil, nil, :x, :y, :z]
  *
- *  Does nothing if no objects given:
+ *  When +index+ is negative, inserts +objects+
+ *  _after_ the element at offset <tt>index + self.size</tt>:
  *
- *    a = [:foo, 'bar', 2]
- *    a.insert(1)
- *    a.insert(50)
- *    a.insert(-50)
- *    a # => [:foo, "bar", 2]
+ *    a = ['a', 'b', 'c']      # => ["a", "b", "c"]
+ *    a.insert(-2, :x, :y, :z) # => ["a", "b", :x, :y, :z, "c"]
  *
- *  When +index+ is negative, inserts all given +objects+
- *  _after_ the element at offset <tt>index+self.size</tt>:
+ *  With no +objects+ given, does nothing:
  *
- *    a = [:foo, 'bar', 2]
- *    a.insert(-2, :bat, :bam)
- *    a # => [:foo, "bar", :bat, :bam, 2]
+ *    a = ['a', 'b', 'c'] # => ["a", "b", "c"]
+ *    a.insert(1)         # => ["a", "b", "c"]
+ *    a.insert(50)        # => ["a", "b", "c"]
+ *    a.insert(-50)       # => ["a", "b", "c"]
+ *
+ *  Raises IndexError if +objects+ are given and +index+ is negative and out of range.
  *
+ *  Related: see {Methods for Assigning}[rdoc-ref:Array@Methods+for+Assigning].
  */
 
 static VALUE
@@ -2588,15 +2670,15 @@ rb_ary_insert(int argc, VALUE *argv, VALUE ary)
     pos = NUM2LONG(argv[0]);
     if (argc == 1) return ary;
     if (pos == -1) {
-	pos = RARRAY_LEN(ary);
+        pos = RARRAY_LEN(ary);
     }
     else if (pos < 0) {
-	long minpos = -RARRAY_LEN(ary) - 1;
-	if (pos < minpos) {
-	    rb_raise(rb_eIndexError, "index %ld too small for array; minimum: %ld",
-		     pos, minpos);
-	}
-	pos++;
+        long minpos = -RARRAY_LEN(ary) - 1;
+        if (pos < minpos) {
+            rb_raise(rb_eIndexError, "index %ld too small for array; minimum: %ld",
+                     pos, minpos);
+        }
+        pos++;
     }
     rb_ary_splice(ary, pos, 0, argv + 1, argc - 1);
     return ary;
@@ -2611,14 +2693,27 @@ ary_enum_length(VALUE ary, VALUE args, VALUE eobj)
     return rb_ary_length(ary);
 }
 
+// Primitive to avoid a race condition in Array#each.
+// Return `true` and write `value` and `index` if the element exists.
+static VALUE
+ary_fetch_next(VALUE self, VALUE *index, VALUE *value)
+{
+    long i = NUM2LONG(*index);
+    if (i >= RARRAY_LEN(self)) {
+        return Qfalse;
+    }
+    *value = RARRAY_AREF(self, i);
+    *index = LONG2NUM(i + 1);
+    return Qtrue;
+}
+
 /*
  *  call-seq:
- *    array.each {|element| ... } -> self
- *    array.each -> Enumerator
+ *    each {|element| ... } -> self
+ *    each -> new_enumerator
  *
- *  Iterates over array elements.
- *
- *  When a block given, passes each successive array element to the block;
+ *  With a block given, iterates over the elements of +self+,
+ *  passing each element to the block;
  *  returns +self+:
  *
  *    a = [:foo, 'bar', 2]
@@ -2640,20 +2735,9 @@ ary_enum_length(VALUE ary, VALUE args, VALUE eobj)
  *    foo
  *    bar
  *
- *  When no block given, returns a new \Enumerator:
- *    a = [:foo, 'bar', 2]
- *
- *    e = a.each
- *    e # => #<Enumerator: [:foo, "bar", 2]:each>
- *    a1 = e.each {|element|  puts "#{element.class} #{element}" }
- *
- *  Output:
- *
- *    Symbol foo
- *    String bar
- *    Integer 2
+ *  With no block given, returns a new Enumerator.
  *
- *  Related: #each_index, #reverse_each.
+ *  Related: see {Methods for Iterating}[rdoc-ref:Array@Methods+for+Iterating].
  */
 
 VALUE
@@ -2663,19 +2747,18 @@ rb_ary_each(VALUE ary)
     ary_verify(ary);
     RETURN_SIZED_ENUMERATOR(ary, 0, 0, ary_enum_length);
     for (i=0; i<RARRAY_LEN(ary); i++) {
-	rb_yield(RARRAY_AREF(ary, i));
+        rb_yield(RARRAY_AREF(ary, i));
     }
     return ary;
 }
 
 /*
  *  call-seq:
- *    array.each_index {|index| ... } -> self
- *    array.each_index -> Enumerator
+ *    each_index {|index| ... } -> self
+ *    each_index -> new_enumerator
  *
- *  Iterates over array indexes.
- *
- *  When a block given, passes each successive array index to the block;
+ *  With a block given, iterates over the elements of +self+,
+ *  passing each <i>array index</i> to the block;
  *  returns +self+:
  *
  *    a = [:foo, 'bar', 2]
@@ -2691,26 +2774,16 @@ rb_ary_each(VALUE ary)
  *
  *    a = [:foo, 'bar', 2]
  *    a.each_index {|index| puts index; a.clear if index > 0 }
+ *    a # => []
  *
  *  Output:
  *
  *    0
  *    1
  *
- *  When no block given, returns a new \Enumerator:
- *
- *    a = [:foo, 'bar', 2]
- *    e = a.each_index
- *    e # => #<Enumerator: [:foo, "bar", 2]:each_index>
- *    a1 = e.each {|index|  puts "#{index} #{a[index]}"}
+ *  With no block given, returns a new Enumerator.
  *
- *  Output:
- *
- *    0 foo
- *    1 bar
- *    2 2
- *
- *  Related: #each, #reverse_each.
+ *  Related: see {Methods for Iterating}[rdoc-ref:Array@Methods+for+Iterating].
  */
 
 static VALUE
@@ -2720,54 +2793,33 @@ rb_ary_each_index(VALUE ary)
     RETURN_SIZED_ENUMERATOR(ary, 0, 0, ary_enum_length);
 
     for (i=0; i<RARRAY_LEN(ary); i++) {
-	rb_yield(LONG2NUM(i));
+        rb_yield(LONG2NUM(i));
     }
     return ary;
 }
 
 /*
  *  call-seq:
- *    array.reverse_each {|element| ... } -> self
- *    array.reverse_each -> Enumerator
- *
- *  Iterates backwards over array elements.
+ *    reverse_each {|element| ... } -> self
+ *    reverse_each -> Enumerator
  *
- *  When a block given, passes, in reverse order, each element to the block;
+ *  When a block given, iterates backwards over the elements of +self+,
+ *  passing, in reverse order, each element to the block;
  *  returns +self+:
  *
- *    a = [:foo, 'bar', 2]
- *    a.reverse_each {|element|  puts "#{element.class} #{element}" }
- *
- *  Output:
- *
- *    Integer 2
- *    String bar
- *    Symbol foo
+ *    a = []
+ *    [0, 1, 2].reverse_each {|element| a.push(element) }
+ *    a # => [2, 1, 0]
  *
  *  Allows the array to be modified during iteration:
  *
- *    a = [:foo, 'bar', 2]
- *    a.reverse_each {|element| puts element; a.clear if element.to_s.start_with?('b') }
- *
- *  Output:
- *
- *    2
- *    bar
- *
- *  When no block given, returns a new \Enumerator:
+ *    a = ['a', 'b', 'c']
+ *    a.reverse_each {|element| a.clear if element.start_with?('b') }
+ *    a # => []
  *
- *    a = [:foo, 'bar', 2]
- *    e = a.reverse_each
- *    e # => #<Enumerator: [:foo, "bar", 2]:reverse_each>
- *    a1 = e.each {|element|  puts "#{element.class} #{element}" }
- *
- *  Output:
+ *  When no block given, returns a new Enumerator.
  *
- *    Integer 2
- *    String bar
- *    Symbol foo
- *
- *  Related: #each, #each_index.
+ *  Related: see {Methods for Iterating}[rdoc-ref:Array@Methods+for+Iterating].
  */
 
 static VALUE
@@ -2778,21 +2830,27 @@ rb_ary_reverse_each(VALUE ary)
     RETURN_SIZED_ENUMERATOR(ary, 0, 0, ary_enum_length);
     len = RARRAY_LEN(ary);
     while (len--) {
-	long nlen;
-	rb_yield(RARRAY_AREF(ary, len));
-	nlen = RARRAY_LEN(ary);
-	if (nlen < len) {
-	    len = nlen;
-	}
+        long nlen;
+        rb_yield(RARRAY_AREF(ary, len));
+        nlen = RARRAY_LEN(ary);
+        if (nlen < len) {
+            len = nlen;
+        }
     }
     return ary;
 }
 
 /*
  *  call-seq:
- *    array.length -> an_integer
+ *    length -> integer
+ *    size -> integer
  *
- *  Returns the count of elements in +self+.
+ *  Returns the count of elements in +self+:
+ *
+ *    [0, 1, 2].length # => 3
+ *    [].length        # => 0
+ *
+ *  Related: see {Methods for Querying}[rdoc-ref:Array@Methods+for+Querying].
  */
 
 static VALUE
@@ -2804,10 +2862,12 @@ rb_ary_length(VALUE ary)
 
 /*
  *  call-seq:
- *    array.empty?  -> true or false
+ *    empty?  -> true or false
  *
  *  Returns +true+ if the count of elements in +self+ is zero,
  *  +false+ otherwise.
+ *
+ *  Related: see {Methods for Querying}[rdoc-ref:Array@Methods+for+Querying].
  */
 
 static VALUE
@@ -2821,7 +2881,7 @@ rb_ary_dup(VALUE ary)
 {
     long len = RARRAY_LEN(ary);
     VALUE dup = rb_ary_new2(len);
-    ary_memcpy(dup, 0, len, RARRAY_CONST_PTR_TRANSIENT(ary));
+    ary_memcpy(dup, 0, len, RARRAY_CONST_PTR(ary));
     ARY_SET_LEN(dup, len);
 
     ary_verify(ary);
@@ -2849,10 +2909,10 @@ recursive_join(VALUE obj, VALUE argp, int recur)
     int *first = (int *)arg[3];
 
     if (recur) {
-	rb_raise(rb_eArgError, "recursive array join");
+        rb_raise(rb_eArgError, "recursive array join");
     }
     else {
-	ary_join_1(obj, ary, sep, 0, result, first);
+        ary_join_1(obj, ary, sep, 0, result, first);
     }
     return Qnil;
 }
@@ -2865,11 +2925,11 @@ ary_join_0(VALUE ary, VALUE sep, long max, VALUE result)
 
     if (max > 0) rb_enc_copy(result, RARRAY_AREF(ary, 0));
     for (i=0; i<max; i++) {
-	val = RARRAY_AREF(ary, i);
+        val = RARRAY_AREF(ary, i);
         if (!RB_TYPE_P(val, T_STRING)) break;
-	if (i > 0 && !NIL_P(sep))
-	    rb_str_buf_append(result, sep);
-	rb_str_buf_append(result, val);
+        if (i > 0 && !NIL_P(sep))
+            rb_str_buf_append(result, sep);
+        rb_str_buf_append(result, val);
     }
     return i;
 }
@@ -2908,16 +2968,16 @@ ary_join_1(VALUE obj, VALUE ary, VALUE sep, long i, VALUE result, int *first)
     VALUE val, tmp;
 
     for (; i<RARRAY_LEN(ary); i++) {
-	if (i > 0 && !NIL_P(sep))
-	    rb_str_buf_append(result, sep);
+        if (i > 0 && !NIL_P(sep))
+            rb_str_buf_append(result, sep);
 
-	val = RARRAY_AREF(ary, i);
-	if (RB_TYPE_P(val, T_STRING)) {
+        val = RARRAY_AREF(ary, i);
+        if (RB_TYPE_P(val, T_STRING)) {
             ary_join_1_str(result, val, first);
-	}
-	else if (RB_TYPE_P(val, T_ARRAY)) {
+        }
+        else if (RB_TYPE_P(val, T_ARRAY)) {
             ary_join_1_ary(val, ary, sep, result, val, first);
-	}
+        }
         else if (!NIL_P(tmp = rb_check_string_type(val))) {
             ary_join_1_str(result, tmp, first);
         }
@@ -2926,7 +2986,7 @@ ary_join_1(VALUE obj, VALUE ary, VALUE sep, long i, VALUE result, int *first)
         }
         else {
             ary_join_1_str(result, rb_obj_as_string(val), first);
-	}
+        }
     }
 }
 
@@ -2939,26 +2999,31 @@ rb_ary_join(VALUE ary, VALUE sep)
     if (RARRAY_LEN(ary) == 0) return rb_usascii_str_new(0, 0);
 
     if (!NIL_P(sep)) {
-	StringValue(sep);
-	len += RSTRING_LEN(sep) * (RARRAY_LEN(ary) - 1);
-    }
-    for (i=0; i<RARRAY_LEN(ary); i++) {
-	val = RARRAY_AREF(ary, i);
-	tmp = rb_check_string_type(val);
-
-	if (NIL_P(tmp) || tmp != val) {
-	    int first;
-            long n = RARRAY_LEN(ary);
-            if (i > n) i = n;
-            result = rb_str_buf_new(len + (n-i)*10);
-	    rb_enc_associate(result, rb_usascii_encoding());
-            i = ary_join_0(ary, sep, i, result);
-	    first = i == 0;
-	    ary_join_1(ary, ary, sep, i, result, &first);
-	    return result;
-	}
-
-	len += RSTRING_LEN(tmp);
+        StringValue(sep);
+        len += RSTRING_LEN(sep) * (RARRAY_LEN(ary) - 1);
+    }
+    long len_memo = RARRAY_LEN(ary);
+    for (i=0; i < len_memo; i++) {
+        val = RARRAY_AREF(ary, i);
+        if (RB_UNLIKELY(!RB_TYPE_P(val, T_STRING))) {
+            tmp = rb_check_string_type(val);
+            if (NIL_P(tmp) || tmp != val) {
+                int first;
+                long n = RARRAY_LEN(ary);
+                if (i > n) i = n;
+                result = rb_str_buf_new(len + (n-i)*10);
+                rb_enc_associate(result, rb_usascii_encoding());
+                i = ary_join_0(ary, sep, i, result);
+                first = i == 0;
+                ary_join_1(ary, ary, sep, i, result, &first);
+                return result;
+            }
+            len += RSTRING_LEN(tmp);
+            len_memo = RARRAY_LEN(ary);
+        }
+        else {
+            len += RSTRING_LEN(val);
+        }
     }
 
     result = rb_str_new(0, len);
@@ -2971,31 +3036,32 @@ rb_ary_join(VALUE ary, VALUE sep)
 
 /*
  *  call-seq:
- *    array.join ->new_string
- *    array.join(separator = $,) -> new_string
+ *    join(separator = $,) -> new_string
  *
- *  Returns the new \String formed by joining the array elements after conversion.
- *  For each element +element+:
+ *  Returns the new string formed by joining the converted elements of +self+;
+ *  for each element +element+:
  *
- *  - Uses <tt>element.to_s</tt> if +element+ is not a <tt>kind_of?(Array)</tt>.
- *  - Uses recursive <tt>element.join(separator)</tt> if +element+ is a <tt>kind_of?(Array)</tt>.
+ *  - Converts recursively using <tt>element.join(separator)</tt>
+ *    if +element+ is a <tt>kind_of?(Array)</tt>.
+ *  - Otherwise, converts using <tt>element.to_s</tt>.
  *
- *  With no argument, joins using the output field separator, <tt>$,</tt>:
+ *  With no argument given, joins using the output field separator, <tt>$,</tt>:
  *
  *    a = [:foo, 'bar', 2]
  *    $, # => nil
  *    a.join # => "foobar2"
  *
- *  With \string argument +separator+, joins using that separator:
+ *  With string argument +separator+ given, joins using that separator:
  *
  *    a = [:foo, 'bar', 2]
  *    a.join("\n") # => "foo\nbar\n2"
  *
- *  Joins recursively for nested Arrays:
+ *  Joins recursively for nested arrays:
  *
  *   a = [:foo, [:bar, [:baz, :bat]]]
  *   a.join # => "foobarbazbat"
  *
+ *  Related: see {Methods for Converting}[rdoc-ref:Array@Methods+for+Converting].
  */
 static VALUE
 rb_ary_join_m(int argc, VALUE *argv, VALUE ary)
@@ -3021,10 +3087,10 @@ inspect_ary(VALUE ary, VALUE dummy, int recur)
     if (recur) return rb_usascii_str_new_cstr("[...]");
     str = rb_str_buf_new2("[");
     for (i=0; i<RARRAY_LEN(ary); i++) {
-	s = rb_inspect(RARRAY_AREF(ary, i));
-	if (i > 0) rb_str_buf_cat2(str, ", ");
-	else rb_enc_copy(str, s);
-	rb_str_buf_append(str, s);
+        s = rb_inspect(RARRAY_AREF(ary, i));
+        if (i > 0) rb_str_buf_cat2(str, ", ");
+        else rb_enc_copy(str, s);
+        rb_str_buf_append(str, s);
     }
     rb_str_buf_cat2(str, "]");
     return str;
@@ -3032,15 +3098,16 @@ inspect_ary(VALUE ary, VALUE dummy, int recur)
 
 /*
  *  call-seq:
- *    array.inspect -> new_string
+ *    inspect -> new_string
+ *    to_s -> new_string
  *
- *  Returns the new \String formed by calling method <tt>#inspect</tt>
+ *  Returns the new string formed by calling method <tt>#inspect</tt>
  *  on each array element:
  *
  *    a = [:foo, 'bar', 2]
  *    a.inspect # => "[:foo, \"bar\", 2]"
  *
- *  Array#to_s is an alias for Array#inspect.
+ *  Related: see {Methods for Converting}[rdoc-ref:Array@Methods+for+Converting].
  */
 
 static VALUE
@@ -3060,57 +3127,53 @@ rb_ary_to_s(VALUE ary)
  *  call-seq:
  *    to_a -> self or new_array
  *
- *  When +self+ is an instance of \Array, returns +self+:
- *
- *    a = [:foo, 'bar', 2]
- *    a.to_a # => [:foo, "bar", 2]
+ *  When +self+ is an instance of \Array, returns +self+.
  *
- *  Otherwise, returns a new \Array containing the elements of +self+:
+ *  Otherwise, returns a new array containing the elements of +self+:
  *
  *    class MyArray < Array; end
- *    a = MyArray.new(['foo', 'bar', 'two'])
- *    a.instance_of?(Array) # => false
- *    a.kind_of?(Array) # => true
- *    a1 = a.to_a
- *    a1 # => ["foo", "bar", "two"]
- *    a1.class # => Array # Not MyArray
+ *    my_a = MyArray.new(['foo', 'bar', 'two'])
+ *    a = my_a.to_a
+ *    a # => ["foo", "bar", "two"]
+ *    a.class # => Array # Not MyArray.
  *
+ *  Related: see {Methods for Converting}[rdoc-ref:Array@Methods+for+Converting].
  */
 
 static VALUE
 rb_ary_to_a(VALUE ary)
 {
     if (rb_obj_class(ary) != rb_cArray) {
-	VALUE dup = rb_ary_new2(RARRAY_LEN(ary));
-	rb_ary_replace(dup, ary);
-	return dup;
+        VALUE dup = rb_ary_new2(RARRAY_LEN(ary));
+        rb_ary_replace(dup, ary);
+        return dup;
     }
     return ary;
 }
 
 /*
  *  call-seq:
- *    array.to_h -> new_hash
- *    array.to_h {|item| ... } -> new_hash
+ *    to_h -> new_hash
+ *    to_h {|element| ... } -> new_hash
  *
- *  Returns a new \Hash formed from +self+.
+ *  Returns a new hash formed from +self+.
  *
- *  When a block is given, calls the block with each array element;
- *  the block must return a 2-element \Array whose two elements
- *  form a key-value pair in the returned \Hash:
+ *  With no block given, each element of +self+ must be a 2-element sub-array;
+ *  forms each sub-array into a key-value pair in the new hash:
  *
- *    a = ['foo', :bar, 1, [2, 3], {baz: 4}]
- *    h = a.to_h {|item| [item, item] }
- *    h # => {"foo"=>"foo", :bar=>:bar, 1=>1, [2, 3]=>[2, 3], {:baz=>4}=>{:baz=>4}}
+ *    a = [['foo', 'zero'], ['bar', 'one'], ['baz', 'two']]
+ *    a.to_h # => {"foo"=>"zero", "bar"=>"one", "baz"=>"two"}
+ *    [].to_h # => {}
  *
- *  When no block is given, +self+ must be an \Array of 2-element sub-arrays,
- *  each sub-array is formed into a key-value pair in the new \Hash:
+ *  With a block given, the block must return a 2-element array;
+ *  calls the block with each element of +self+;
+ *  forms each returned array into a key-value pair in the returned hash:
  *
- *    [].to_h # => {}
- *    a = [['foo', 'zero'], ['bar', 'one'], ['baz', 'two']]
- *    h = a.to_h
- *    h # => {"foo"=>"zero", "bar"=>"one", "baz"=>"two"}
+ *    a = ['foo', :bar, 1, [2, 3], {baz: 4}]
+ *    a.to_h {|element| [element, element.class] }
+ *    # => {"foo"=>String, :bar=>Symbol, 1=>Integer, [2, 3]=>Array, {:baz=>4}=>Hash}
  *
+ *  Related: see {Methods for Converting}[rdoc-ref:Array@Methods+for+Converting].
  */
 
 static VALUE
@@ -3121,25 +3184,25 @@ rb_ary_to_h(VALUE ary)
     int block_given = rb_block_given_p();
 
     for (i=0; i<RARRAY_LEN(ary); i++) {
-	const VALUE e = rb_ary_elt(ary, i);
-	const VALUE elt = block_given ? rb_yield_force_blockarg(e) : e;
-	const VALUE key_value_pair = rb_check_array_type(elt);
-	if (NIL_P(key_value_pair)) {
-	    rb_raise(rb_eTypeError, "wrong element type %"PRIsVALUE" at %ld (expected array)",
-		     rb_obj_class(elt), i);
-	}
-	if (RARRAY_LEN(key_value_pair) != 2) {
-	    rb_raise(rb_eArgError, "wrong array length at %ld (expected 2, was %ld)",
-		i, RARRAY_LEN(key_value_pair));
-	}
-	rb_hash_aset(hash, RARRAY_AREF(key_value_pair, 0), RARRAY_AREF(key_value_pair, 1));
+        const VALUE e = rb_ary_elt(ary, i);
+        const VALUE elt = block_given ? rb_yield_force_blockarg(e) : e;
+        const VALUE key_value_pair = rb_check_array_type(elt);
+        if (NIL_P(key_value_pair)) {
+            rb_raise(rb_eTypeError, "wrong element type %"PRIsVALUE" at %ld (expected array)",
+                     rb_obj_class(elt), i);
+        }
+        if (RARRAY_LEN(key_value_pair) != 2) {
+            rb_raise(rb_eArgError, "wrong array length at %ld (expected 2, was %ld)",
+                i, RARRAY_LEN(key_value_pair));
+        }
+        rb_hash_aset(hash, RARRAY_AREF(key_value_pair, 0), RARRAY_AREF(key_value_pair, 1));
     }
     return hash;
 }
 
 /*
  *  call-seq:
- *    array.to_ary -> self
+ *    to_ary -> self
  *
  *  Returns +self+.
  */
@@ -3154,9 +3217,9 @@ static void
 ary_reverse(VALUE *p1, VALUE *p2)
 {
     while (p1 < p2) {
-	VALUE tmp = *p1;
-	*p1++ = *p2;
-	*p2-- = tmp;
+        VALUE tmp = *p1;
+        *p1++ = *p2;
+        *p2-- = tmp;
     }
 }
 
@@ -3168,23 +3231,26 @@ rb_ary_reverse(VALUE ary)
 
     rb_ary_modify(ary);
     if (len > 1) {
-        RARRAY_PTR_USE_TRANSIENT(ary, p1, {
+        RARRAY_PTR_USE(ary, p1, {
             p2 = p1 + len - 1;	/* points last item */
             ary_reverse(p1, p2);
-	}); /* WB: no new reference */
+        }); /* WB: no new reference */
     }
     return ary;
 }
 
 /*
  *  call-seq:
- *    array.reverse! -> self
+ *    reverse! -> self
  *
- *  Reverses +self+ in place:
+ *  Reverses the order of the elements of +self+;
+ *  returns +self+:
  *
- *    a = ['foo', 'bar', 'two']
- *    a.reverse! # => ["two", "bar", "foo"]
+ *    a = [0, 1, 2]
+ *    a.reverse! # => [2, 1, 0]
+ *    a          # => [2, 1, 0]
  *
+ *  Related: see {Methods for Assigning}[rdoc-ref:Array@Methods+for+Assigning].
  */
 
 static VALUE
@@ -3195,14 +3261,13 @@ rb_ary_reverse_bang(VALUE ary)
 
 /*
  *  call-seq:
- *    array.reverse -> new_array
+ *    reverse -> new_array
  *
- *  Returns a new \Array with the elements of +self+ in reverse order:
+ *  Returns a new array containing the elements of +self+ in reverse order:
  *
- *    a = ['foo', 'bar', 'two']
- *    a1 = a.reverse
- *    a1 # => ["two", "bar", "foo"]
+ *    [0, 1, 2].reverse # => [2, 1, 0]
  *
+ *  Related: see {Methods for Combining}[rdoc-ref:Array@Methods+for+Combining].
  */
 
 static VALUE
@@ -3212,9 +3277,9 @@ rb_ary_reverse_m(VALUE ary)
     VALUE dup = rb_ary_new2(len);
 
     if (len > 0) {
-        const VALUE *p1 = RARRAY_CONST_PTR_TRANSIENT(ary);
-        VALUE *p2 = (VALUE *)RARRAY_CONST_PTR_TRANSIENT(dup) + len - 1;
-	do *p2-- = *p1++; while (--len > 0);
+        const VALUE *p1 = RARRAY_CONST_PTR(ary);
+        VALUE *p2 = (VALUE *)RARRAY_CONST_PTR(dup) + len - 1;
+        do *p2-- = *p1++; while (--len > 0);
     }
     ARY_SET_LEN(dup, RARRAY_LEN(ary));
     return dup;
@@ -3255,7 +3320,7 @@ rb_ary_rotate(VALUE ary, long cnt)
     if (cnt != 0) {
         long len = RARRAY_LEN(ary);
         if (len > 1 && (cnt = rotate_count(cnt, len)) > 0) {
-            RARRAY_PTR_USE_TRANSIENT(ary, ptr, ary_rotate_ptr(ptr, len, cnt));
+            RARRAY_PTR_USE(ary, ptr, ary_rotate_ptr(ptr, len, cnt));
             return ary;
         }
     }
@@ -3264,48 +3329,34 @@ rb_ary_rotate(VALUE ary, long cnt)
 
 /*
  *  call-seq:
- *    array.rotate! -> self
- *    array.rotate!(count) -> self
+ *    rotate!(count = 1) -> self
  *
  *  Rotates +self+ in place by moving elements from one end to the other; returns +self+.
  *
- *  When no argument given, rotates the first element to the last position:
- *
- *    a = [:foo, 'bar', 2, 'bar']
- *    a.rotate! # => ["bar", 2, "bar", :foo]
- *
- *  When given a non-negative \Integer +count+,
+ *  With non-negative numeric +count+,
  *  rotates +count+ elements from the beginning to the end:
  *
- *    a = [:foo, 'bar', 2]
- *    a.rotate!(2)
- *    a # => [2, :foo, "bar"]
+ *    [0, 1, 2, 3].rotate!(2)   # => [2, 3, 0, 1]
+      [0, 1, 2, 3].rotate!(2.1) # => [2, 3, 0, 1]
  *
  *  If +count+ is large, uses <tt>count % array.size</tt> as the count:
  *
- *    a = [:foo, 'bar', 2]
- *    a.rotate!(20)
- *    a # => [2, :foo, "bar"]
+ *    [0, 1, 2, 3].rotate!(21) # => [1, 2, 3, 0]
  *
- *  If +count+ is zero, returns +self+ unmodified:
+ *  If +count+ is zero, rotates no elements:
  *
- *    a = [:foo, 'bar', 2]
- *    a.rotate!(0)
- *    a # => [:foo, "bar", 2]
+ *    [0, 1, 2, 3].rotate!(0) # => [0, 1, 2, 3]
  *
- *  When given a negative Integer +count+, rotates in the opposite direction,
+ *  With a negative numeric +count+, rotates in the opposite direction,
  *  from end to beginning:
  *
- *    a = [:foo, 'bar', 2]
- *    a.rotate!(-2)
- *    a # => ["bar", 2, :foo]
+ *    [0, 1, 2, 3].rotate!(-1) # => [3, 0, 1, 2]
  *
  *  If +count+ is small (far from zero), uses <tt>count % array.size</tt> as the count:
  *
- *    a = [:foo, 'bar', 2]
- *    a.rotate!(-5)
- *    a # => ["bar", 2, :foo]
+ *    [0, 1, 2, 3].rotate!(-21) # => [3, 0, 1, 2]
  *
+ *  Related: see {Methods for Assigning}[rdoc-ref:Array@Methods+for+Assigning].
  */
 
 static VALUE
@@ -3318,51 +3369,35 @@ rb_ary_rotate_bang(int argc, VALUE *argv, VALUE ary)
 
 /*
  *  call-seq:
- *    array.rotate -> new_array
- *    array.rotate(count) -> new_array
+ *    rotate(count = 1) -> new_array
  *
- *  Returns a new \Array formed from +self+ with elements
+ *  Returns a new array formed from +self+ with elements
  *  rotated from one end to the other.
  *
- *  When no argument given, returns a new \Array that is like +self+,
- *  except that the first element has been rotated to the last position:
+ *  With non-negative numeric +count+,
+ *  rotates elements from the beginning to the end:
  *
- *    a = [:foo, 'bar', 2, 'bar']
- *    a1 = a.rotate
- *    a1 # => ["bar", 2, "bar", :foo]
- *
- *  When given a non-negative \Integer +count+,
- *  returns a new \Array with +count+ elements rotated from the beginning to the end:
- *
- *    a = [:foo, 'bar', 2]
- *    a1 = a.rotate(2)
- *    a1 # => [2, :foo, "bar"]
+ *    [0, 1, 2, 3].rotate(2)   # => [2, 3, 0, 1]
+ *    [0, 1, 2, 3].rotate(2.1) # => [2, 3, 0, 1]
  *
  *  If +count+ is large, uses <tt>count % array.size</tt> as the count:
  *
- *    a = [:foo, 'bar', 2]
- *    a1 = a.rotate(20)
- *    a1 # => [2, :foo, "bar"]
+ *    [0, 1, 2, 3].rotate(22) # => [2, 3, 0, 1]
  *
- *  If +count+ is zero, returns a copy of +self+, unmodified:
+ *  With a +count+ of zero, rotates no elements:
  *
- *    a = [:foo, 'bar', 2]
- *    a1 = a.rotate(0)
- *    a1 # => [:foo, "bar", 2]
+ *    [0, 1, 2, 3].rotate(0) # => [0, 1, 2, 3]
  *
- *  When given a negative \Integer +count+, rotates in the opposite direction,
- *  from end to beginning:
+ *  With negative numeric +count+, rotates in the opposite direction,
+ *  from the end to the beginning:
  *
- *    a = [:foo, 'bar', 2]
- *    a1 = a.rotate(-2)
- *    a1 # => ["bar", 2, :foo]
+ *    [0, 1, 2, 3].rotate(-1) # => [3, 0, 1, 2]
  *
  *  If +count+ is small (far from zero), uses <tt>count % array.size</tt> as the count:
  *
- *    a = [:foo, 'bar', 2]
- *    a1 = a.rotate(-5)
- *    a1 # => ["bar", 2, :foo]
+ *    [0, 1, 2, 3].rotate(-21) # => [3, 0, 1, 2]
  *
+ *  Related: see {Methods for Fetching}[rdoc-ref:Array@Methods+for+Fetching].
  */
 
 static VALUE
@@ -3376,11 +3411,11 @@ rb_ary_rotate_m(int argc, VALUE *argv, VALUE ary)
     len = RARRAY_LEN(ary);
     rotated = rb_ary_new2(len);
     if (len > 0) {
-	cnt = rotate_count(cnt, len);
-        ptr = RARRAY_CONST_PTR_TRANSIENT(ary);
-	len -= cnt;
-	ary_memcpy(rotated, 0, len, ptr + cnt);
-	ary_memcpy(rotated, len, cnt, ptr);
+        cnt = rotate_count(cnt, len);
+        ptr = RARRAY_CONST_PTR(ary);
+        len -= cnt;
+        ary_memcpy(rotated, 0, len, ptr + cnt);
+        ary_memcpy(rotated, len, cnt, ptr);
     }
     ARY_SET_LEN(rotated, RARRAY_LEN(ary));
     return rotated;
@@ -3389,14 +3424,13 @@ rb_ary_rotate_m(int argc, VALUE *argv, VALUE ary)
 struct ary_sort_data {
     VALUE ary;
     VALUE receiver;
-    struct cmp_opt_data cmp_opt;
 };
 
 static VALUE
 sort_reentered(VALUE ary)
 {
     if (RBASIC(ary)->klass) {
-	rb_raise(rb_eRuntimeError, "sort reentered");
+        rb_raise(rb_eRuntimeError, "sort reentered");
     }
     return Qnil;
 }
@@ -3435,16 +3469,16 @@ sort_2(const void *ap, const void *bp, void *dummy)
     VALUE a = *(const VALUE *)ap, b = *(const VALUE *)bp;
     int n;
 
-    if (FIXNUM_P(a) && FIXNUM_P(b) && CMP_OPTIMIZABLE(data->cmp_opt, Integer)) {
-	if ((long)a > (long)b) return 1;
-	if ((long)a < (long)b) return -1;
-	return 0;
+    if (FIXNUM_P(a) && FIXNUM_P(b) && CMP_OPTIMIZABLE(INTEGER)) {
+        if ((long)a > (long)b) return 1;
+        if ((long)a < (long)b) return -1;
+        return 0;
     }
-    if (STRING_P(a) && STRING_P(b) && CMP_OPTIMIZABLE(data->cmp_opt, String)) {
-	return rb_str_cmp(a, b);
+    if (STRING_P(a) && STRING_P(b) && CMP_OPTIMIZABLE(STRING)) {
+        return rb_str_cmp(a, b);
     }
-    if (RB_FLOAT_TYPE_P(a) && CMP_OPTIMIZABLE(data->cmp_opt, Float)) {
-	return rb_float_cmp(a, b);
+    if (RB_FLOAT_TYPE_P(a) && CMP_OPTIMIZABLE(FLOAT)) {
+        return rb_float_cmp(a, b);
     }
 
     retval = rb_funcallv(a, id_cmp, 1, &b);
@@ -3456,70 +3490,40 @@ sort_2(const void *ap, const void *bp, void *dummy)
 
 /*
  *  call-seq:
- *    array.sort! -> self
- *    array.sort! {|a, b| ... } -> self
- *
- *  Returns +self+ with its elements sorted in place.
- *
- *  With no block, compares elements using operator <tt><=></tt>
- *  (see Comparable):
- *
- *    a = 'abcde'.split('').shuffle
- *    a # => ["e", "b", "d", "a", "c"]
- *    a.sort!
- *    a # => ["a", "b", "c", "d", "e"]
- *
- *  With a block, calls the block with each element pair;
- *  for each element pair +a+ and +b+, the block should return an integer:
- *
- *  - Negative when +b+ is to follow +a+.
- *  - Zero when +a+ and +b+ are equivalent.
- *  - Positive when +a+ is to follow +b+.
- *
- *  Example:
- *
- *    a = 'abcde'.split('').shuffle
- *    a # => ["e", "b", "d", "a", "c"]
- *    a.sort! {|a, b| a <=> b }
- *    a # => ["a", "b", "c", "d", "e"]
- *    a.sort! {|a, b| b <=> a }
- *    a # => ["e", "d", "c", "b", "a"]
+ *    sort! -> self
+ *    sort! {|a, b| ... } -> self
  *
- *  When the block returns zero, the order for +a+ and +b+ is indeterminate,
- *  and may be unstable:
- *
- *    a = 'abcde'.split('').shuffle
- *    a # => ["e", "b", "d", "a", "c"]
- *    a.sort! {|a, b| 0 }
- *    a # => ["d", "e", "c", "a", "b"]
+ *  Like Array#sort, but returns +self+ with its elements sorted in place.
  *
+ *  Related: see {Methods for Assigning}[rdoc-ref:Array@Methods+for+Assigning].
  */
 
 VALUE
 rb_ary_sort_bang(VALUE ary)
 {
     rb_ary_modify(ary);
-    assert(!ARY_SHARED_P(ary));
+    RUBY_ASSERT(!ARY_SHARED_P(ary));
     if (RARRAY_LEN(ary) > 1) {
-	VALUE tmp = ary_make_substitution(ary); /* only ary refers tmp */
-	struct ary_sort_data data;
-	long len = RARRAY_LEN(ary);
-	RBASIC_CLEAR_CLASS(tmp);
-	data.ary = tmp;
+        VALUE tmp = ary_make_substitution(ary); /* only ary refers tmp */
+        struct ary_sort_data data;
+        long len = RARRAY_LEN(ary);
+        RBASIC_CLEAR_CLASS(tmp);
+        data.ary = tmp;
         data.receiver = ary;
-	data.cmp_opt.opt_methods = 0;
-	data.cmp_opt.opt_inited = 0;
-	RARRAY_PTR_USE(tmp, ptr, {
+        RARRAY_PTR_USE(tmp, ptr, {
             ruby_qsort(ptr, len, sizeof(VALUE),
                        rb_block_given_p()?sort_1:sort_2, &data);
-	}); /* WB: no new reference */
-	rb_ary_modify(ary);
+        }); /* WB: no new reference */
+        rb_ary_modify(ary);
         if (ARY_EMBED_P(tmp)) {
             if (ARY_SHARED_P(ary)) { /* ary might be destructively operated in the given block */
                 rb_ary_unshare(ary);
-		FL_SET_EMBED(ary);
+                FL_SET_EMBED(ary);
             }
-	    ary_memcpy(ary, 0, ARY_EMBED_LEN(tmp), ARY_EMBED_PTR(tmp));
+            if (ARY_EMBED_LEN(tmp) > ARY_CAPA(ary)) {
+                ary_resize_capa(ary, ARY_EMBED_LEN(tmp));
+            }
+            ary_memcpy(ary, 0, ARY_EMBED_LEN(tmp), ARY_EMBED_PTR(tmp));
             ARY_SET_LEN(ary, ARY_EMBED_LEN(tmp));
         }
         else {
@@ -3528,7 +3532,7 @@ rb_ary_sort_bang(VALUE ary)
                 ARY_SET_CAPA(ary, RARRAY_LEN(tmp));
             }
             else {
-                assert(!ARY_SHARED_P(tmp));
+                RUBY_ASSERT(!ARY_SHARED_P(tmp));
                 if (ARY_EMBED_P(ary)) {
                     FL_UNSET_EMBED(ary);
                 }
@@ -3544,10 +3548,9 @@ rb_ary_sort_bang(VALUE ary)
                 ARY_SET_CAPA(ary, ARY_HEAP_LEN(tmp));
             }
             /* tmp was lost ownership for the ptr */
-            FL_UNSET(tmp, FL_FREEZE);
             FL_SET_EMBED(tmp);
             ARY_SET_EMBED_LEN(tmp, 0);
-            FL_SET(tmp, FL_FREEZE);
+            OBJ_FREEZE(tmp);
         }
         /* tmp will be GC'ed. */
         RBASIC_SET_CLASS_RAW(tmp, rb_cArray); /* rb_cArray must be marked */
@@ -3558,21 +3561,18 @@ rb_ary_sort_bang(VALUE ary)
 
 /*
  *  call-seq:
- *    array.sort -> new_array
- *    array.sort {|a, b| ... } -> new_array
+ *    sort -> new_array
+ *    sort {|a, b| ... } -> new_array
  *
- *  Returns a new \Array whose elements are those from +self+, sorted.
+ *  Returns a new array containing the elements of +self+, sorted.
  *
- *  With no block, compares elements using operator <tt><=></tt>
- *  (see Comparable):
+ *  With no block given, compares elements using operator <tt>#<=></tt>
+ *  (see Object#<=>):
  *
- *    a = 'abcde'.split('').shuffle
- *    a # => ["e", "b", "d", "a", "c"]
- *    a1 = a.sort
- *    a1 # => ["a", "b", "c", "d", "e"]
+ *    [0, 2, 3, 1].sort # => [0, 1, 2, 3]
  *
- *  With a block, calls the block with each element pair;
- *  for each element pair +a+ and +b+, the block should return an integer:
+ *  With a block given, calls the block with each combination of pairs of elements from +self+;
+ *  for each pair +a+ and +b+, the block should return a numeric:
  *
  *  - Negative when +b+ is to follow +a+.
  *  - Zero when +a+ and +b+ are equivalent.
@@ -3580,22 +3580,17 @@ rb_ary_sort_bang(VALUE ary)
  *
  *  Example:
  *
- *    a = 'abcde'.split('').shuffle
- *    a # => ["e", "b", "d", "a", "c"]
- *    a1 = a.sort {|a, b| a <=> b }
- *    a1 # => ["a", "b", "c", "d", "e"]
- *    a2 = a.sort {|a, b| b <=> a }
- *    a2 # => ["e", "d", "c", "b", "a"]
+ *    a = [3, 2, 0, 1]
+ *    a.sort {|a, b| a <=> b } # => [0, 1, 2, 3]
+ *    a.sort {|a, b| b <=> a } # => [3, 2, 1, 0]
  *
  *  When the block returns zero, the order for +a+ and +b+ is indeterminate,
- *  and may be unstable:
+ *  and may be unstable.
  *
- *    a = 'abcde'.split('').shuffle
- *    a # => ["e", "b", "d", "a", "c"]
- *    a1 = a.sort {|a, b| 0 }
- *    a1 # =>  ["c", "e", "b", "d", "a"]
+ *  See an example in Numeric#nonzero? for the idiom to sort more
+ *  complex structure.
  *
- *  Related: Enumerable#sort_by.
+ *  Related: see {Methods for Fetching}[rdoc-ref:Array@Methods+for+Fetching].
  */
 
 VALUE
@@ -3610,12 +3605,15 @@ static VALUE rb_ary_bsearch_index(VALUE ary);
 
 /*
  *  call-seq:
- *    array.bsearch {|element| ... } -> object
- *    array.bsearch -> new_enumerator
+ *    bsearch {|element| ... } -> found_element or nil
+ *    bsearch -> new_enumerator
+ *
+ *  Returns the element from +self+ found by a binary search,
+ *  or +nil+ if the search found no suitable element.
  *
- *  Returns an element from +self+ selected by a binary search.
+ *  See {Binary Searching}[rdoc-ref:language/bsearch.rdoc].
  *
- *  See {Binary Searching}[rdoc-ref:bsearch.rdoc].
+ *  Related: see {Methods for Fetching}[rdoc-ref:Array@Methods+for+Fetching].
  */
 
 static VALUE
@@ -3624,18 +3622,22 @@ rb_ary_bsearch(VALUE ary)
     VALUE index_result = rb_ary_bsearch_index(ary);
 
     if (FIXNUM_P(index_result)) {
-	return rb_ary_entry(ary, FIX2LONG(index_result));
+        return rb_ary_entry(ary, FIX2LONG(index_result));
     }
     return index_result;
 }
 
 /*
  *  call-seq:
- *    array.bsearch_index {|element| ... } -> integer or nil
- *    array.bsearch_index -> new_enumerator
+ *    bsearch_index {|element| ... } -> integer or nil
+ *    bsearch_index -> new_enumerator
+ *
+ *  Returns the integer index of the element from +self+ found by a binary search,
+ *  or +nil+ if the search found no suitable element.
+ *
+ *  See {Binary Searching}[rdoc-ref:language/bsearch.rdoc].
  *
- *  Searches +self+ as described at method #bsearch,
- *  but returns the _index_ of the found element instead of the element itself.
+ *  Related: see {Methods for Fetching}[rdoc-ref:Array@Methods+for+Fetching].
  */
 
 static VALUE
@@ -3647,39 +3649,39 @@ rb_ary_bsearch_index(VALUE ary)
 
     RETURN_ENUMERATOR(ary, 0, 0);
     while (low < high) {
-	mid = low + ((high - low) / 2);
-	val = rb_ary_entry(ary, mid);
-	v = rb_yield(val);
-	if (FIXNUM_P(v)) {
-	    if (v == INT2FIX(0)) return INT2FIX(mid);
-	    smaller = (SIGNED_VALUE)v < 0; /* Fixnum preserves its sign-bit */
-	}
-	else if (v == Qtrue) {
-	    satisfied = 1;
-	    smaller = 1;
-	}
-	else if (!RTEST(v)) {
-	    smaller = 0;
-	}
-	else if (rb_obj_is_kind_of(v, rb_cNumeric)) {
-	    const VALUE zero = INT2FIX(0);
-	    switch (rb_cmpint(rb_funcallv(v, id_cmp, 1, &zero), v, zero)) {
-	      case 0: return INT2FIX(mid);
-	      case 1: smaller = 1; break;
-	      case -1: smaller = 0;
-	    }
-	}
-	else {
-	    rb_raise(rb_eTypeError, "wrong argument type %"PRIsVALUE
-		     " (must be numeric, true, false or nil)",
-		     rb_obj_class(v));
-	}
-	if (smaller) {
-	    high = mid;
-	}
-	else {
-	    low = mid + 1;
-	}
+        mid = low + ((high - low) / 2);
+        val = rb_ary_entry(ary, mid);
+        v = rb_yield(val);
+        if (FIXNUM_P(v)) {
+            if (v == INT2FIX(0)) return INT2FIX(mid);
+            smaller = (SIGNED_VALUE)v < 0; /* Fixnum preserves its sign-bit */
+        }
+        else if (v == Qtrue) {
+            satisfied = 1;
+            smaller = 1;
+        }
+        else if (!RTEST(v)) {
+            smaller = 0;
+        }
+        else if (rb_obj_is_kind_of(v, rb_cNumeric)) {
+            const VALUE zero = INT2FIX(0);
+            switch (rb_cmpint(rb_funcallv(v, id_cmp, 1, &zero), v, zero)) {
+              case 0: return INT2FIX(mid);
+              case 1: smaller = 0; break;
+              case -1: smaller = 1;
+            }
+        }
+        else {
+            rb_raise(rb_eTypeError, "wrong argument type %"PRIsVALUE
+                     " (must be numeric, true, false or nil)",
+                     rb_obj_class(v));
+        }
+        if (smaller) {
+            high = mid;
+        }
+        else {
+            low = mid + 1;
+        }
     }
     if (!satisfied) return Qnil;
     return INT2FIX(low);
@@ -3694,28 +3696,24 @@ sort_by_i(RB_BLOCK_CALL_FUNC_ARGLIST(i, dummy))
 
 /*
  *  call-seq:
- *    array.sort_by! {|element| ... } -> self
- *    array.sort_by! -> new_enumerator
+ *    sort_by! {|element| ... } -> self
+ *    sort_by! -> new_enumerator
  *
- *  Sorts the elements of +self+ in place,
- *  using an ordering determined by the block; returns self.
+ *  With a block given, sorts the elements of +self+ in place;
+ *  returns self.
  *
  *  Calls the block with each successive element;
- *  sorts elements based on the values returned from the block.
- *
- *  For duplicates returned by the block, the ordering is indeterminate, and may be unstable.
- *
- *  This example sorts strings based on their sizes:
+ *  sorts elements based on the values returned from the block:
  *
  *    a = ['aaaa', 'bbb', 'cc', 'd']
  *    a.sort_by! {|element| element.size }
  *    a # => ["d", "cc", "bbb", "aaaa"]
  *
- *  Returns a new \Enumerator if no block given:
+ *  For duplicate values returned by the block, the ordering is indeterminate, and may be unstable.
  *
- *    a = ['aaaa', 'bbb', 'cc', 'd']
- *    a.sort_by! # => #<Enumerator: ["aaaa", "bbb", "cc", "d"]:sort_by!>
+ *  With no block given, returns a new Enumerator.
  *
+ *  Related: see {Methods for Assigning}[rdoc-ref:Array@Methods+for+Assigning].
  */
 
 static VALUE
@@ -3725,30 +3723,32 @@ rb_ary_sort_by_bang(VALUE ary)
 
     RETURN_SIZED_ENUMERATOR(ary, 0, 0, ary_enum_length);
     rb_ary_modify(ary);
-    sorted = rb_block_call(ary, rb_intern("sort_by"), 0, 0, sort_by_i, 0);
-    rb_ary_replace(ary, sorted);
+    if (RARRAY_LEN(ary) > 1) {
+        sorted = rb_block_call(ary, rb_intern("sort_by"), 0, 0, sort_by_i, 0);
+        rb_ary_replace(ary, sorted);
+    }
     return ary;
 }
 
 
 /*
  *  call-seq:
- *    array.map {|element| ... } -> new_array
- *    array.map -> new_enumerator
+ *    collect {|element| ... } -> new_array
+ *    collect -> new_enumerator
+ *    map {|element| ... } -> new_array
+ *    map -> new_enumerator
  *
- *  Calls the block, if given, with each element of +self+;
- *  returns a new \Array whose elements are the return values from the block:
+ *  With a block given, calls the block with each element of +self+;
+ *  returns a new array whose elements are the return values from the block:
  *
  *    a = [:foo, 'bar', 2]
  *    a1 = a.map {|element| element.class }
  *    a1 # => [Symbol, String, Integer]
  *
- *  Returns a new \Enumerator if no block given:
- *    a = [:foo, 'bar', 2]
- *    a1 = a.map
- *    a1 # => #<Enumerator: [:foo, "bar", 2]:map>
+ *  With no block given, returns a new Enumerator.
  *
- *  Array#collect is an alias for Array#map.
+ *  Related: #collect!;
+ *  see also {Methods for Converting}[rdoc-ref:Array@Methods+for+Converting].
  */
 
 static VALUE
@@ -3768,22 +3768,22 @@ rb_ary_collect(VALUE ary)
 
 /*
  *  call-seq:
- *    array.map! {|element| ... } -> self
- *    array.map! -> new_enumerator
+ *    collect! {|element| ... } -> self
+ *    collect! -> new_enumerator
+ *    map! {|element| ... } -> self
+ *    map! -> new_enumerator
  *
- *  Calls the block, if given, with each element;
- *  replaces the element with the block's return value:
+ *  With a block given, calls the block with each element of +self+
+ *  and replaces the element with the block's return value;
+ *  returns +self+:
  *
  *    a = [:foo, 'bar', 2]
  *    a.map! { |element| element.class } # => [Symbol, String, Integer]
  *
- *  Returns a new \Enumerator if no block given:
- *
- *    a = [:foo, 'bar', 2]
- *    a1 = a.map!
- *    a1 # => #<Enumerator: [:foo, "bar", 2]:map!>
+ *  With no block given, returns a new Enumerator.
  *
- *  Array#collect! is an alias for Array#map!.
+ *  Related: #collect;
+ *  see also {Methods for Converting}[rdoc-ref:Array@Methods+for+Converting].
  */
 
 static VALUE
@@ -3794,7 +3794,7 @@ rb_ary_collect_bang(VALUE ary)
     RETURN_SIZED_ENUMERATOR(ary, 0, 0, ary_enum_length);
     rb_ary_modify(ary);
     for (i = 0; i < RARRAY_LEN(ary); i++) {
-	rb_ary_store(ary, i, rb_yield(RARRAY_AREF(ary, i)));
+        rb_ary_store(ary, i, rb_yield(RARRAY_AREF(ary, i)));
     }
     return ary;
 }
@@ -3806,21 +3806,21 @@ rb_get_values_at(VALUE obj, long olen, int argc, const VALUE *argv, VALUE (*func
     long beg, len, i, j;
 
     for (i=0; i<argc; i++) {
-	if (FIXNUM_P(argv[i])) {
-	    rb_ary_push(result, (*func)(obj, FIX2LONG(argv[i])));
-	    continue;
-	}
-	/* check if idx is Range */
-	if (rb_range_beg_len(argv[i], &beg, &len, olen, 1)) {
-	    long end = olen < beg+len ? olen : beg+len;
-	    for (j = beg; j < end; j++) {
-		rb_ary_push(result, (*func)(obj, j));
-	    }
-	    if (beg + len > j)
-		rb_ary_resize(result, RARRAY_LEN(result) + (beg + len) - j);
-	    continue;
-	}
-	rb_ary_push(result, (*func)(obj, NUM2LONG(argv[i])));
+        if (FIXNUM_P(argv[i])) {
+            rb_ary_push(result, (*func)(obj, FIX2LONG(argv[i])));
+            continue;
+        }
+        /* check if idx is Range */
+        if (rb_range_beg_len(argv[i], &beg, &len, olen, 1)) {
+            long end = olen < beg+len ? olen : beg+len;
+            for (j = beg; j < end; j++) {
+                rb_ary_push(result, (*func)(obj, j));
+            }
+            if (beg + len > j)
+                rb_ary_resize(result, RARRAY_LEN(result) + (beg + len) - j);
+            continue;
+        }
+        rb_ary_push(result, (*func)(obj, NUM2LONG(argv[i])));
     }
     return result;
 }
@@ -3830,70 +3830,133 @@ append_values_at_single(VALUE result, VALUE ary, long olen, VALUE idx)
 {
     long beg, len;
     if (FIXNUM_P(idx)) {
-	beg = FIX2LONG(idx);
+        beg = FIX2LONG(idx);
     }
     /* check if idx is Range */
     else if (rb_range_beg_len(idx, &beg, &len, olen, 1)) {
-	if (len > 0) {
-            const VALUE *const src = RARRAY_CONST_PTR_TRANSIENT(ary);
-	    const long end = beg + len;
-	    const long prevlen = RARRAY_LEN(result);
-	    if (beg < olen) {
-		rb_ary_cat(result, src + beg, end > olen ? olen-beg : len);
-	    }
-	    if (end > olen) {
-		rb_ary_store(result, prevlen + len - 1, Qnil);
-	    }
-	}
-	return result;
+        if (len > 0) {
+            const VALUE *const src = RARRAY_CONST_PTR(ary);
+            const long end = beg + len;
+            const long prevlen = RARRAY_LEN(result);
+            if (beg < olen) {
+                rb_ary_cat(result, src + beg, end > olen ? olen-beg : len);
+            }
+            if (end > olen) {
+                rb_ary_store(result, prevlen + len - 1, Qnil);
+            }
+        }
+        return result;
     }
     else {
-	beg = NUM2LONG(idx);
+        beg = NUM2LONG(idx);
     }
     return rb_ary_push(result, rb_ary_entry(ary, beg));
 }
 
 /*
  *  call-seq:
- *    array.values_at(*indexes) -> new_array
+ *    values_at(*specifiers) -> new_array
  *
- *  Returns a new \Array whose elements are the elements
- *  of +self+ at the given \Integer or \Range +indexes+.
+ *  Returns elements from +self+ in a new array; does not modify +self+.
  *
- *  For each positive +index+, returns the element at offset +index+:
+ *  The objects included in the returned array are the elements of +self+
+ *  selected by the given +specifiers+,
+ *  each of which must be a numeric index or a Range.
  *
- *    a = [:foo, 'bar', 2]
- *    a.values_at(0, 2) # => [:foo, 2]
- *    a.values_at(0..1) # => [:foo, "bar"]
+ *  In brief:
  *
- *  The given +indexes+ may be in any order, and may repeat:
+ *    a = ['a', 'b', 'c', 'd']
  *
- *    a = [:foo, 'bar', 2]
- *    a.values_at(2, 0, 1, 0, 2) # => [2, :foo, "bar", :foo, 2]
- *    a.values_at(1, 0..2) # => ["bar", :foo, "bar", 2]
+ *    # Index specifiers.
+ *    a.values_at(2, 0, 2, 0)     # => ["c", "a", "c", "a"] # May repeat.
+ *    a.values_at(-4, -3, -2, -1) # => ["a", "b", "c", "d"] # Counts backwards if negative.
+ *    a.values_at(-50, 50)        # => [nil, nil]           # Outside of self.
  *
- *  Assigns +nil+ for an +index+ that is too large:
+ *    # Range specifiers.
+ *    a.values_at(1..3)       # => ["b", "c", "d"] # From range.begin to range.end.
+ *    a.values_at(1...3)      # => ["b", "c"]      # End excluded.
+ *    a.values_at(3..1)       # => []              # No such elements.
  *
- *    a = [:foo, 'bar', 2]
- *    a.values_at(0, 3, 1, 3) # => [:foo, nil, "bar", nil]
+ *    a.values_at(-3..3)  # => ["b", "c", "d"]     # Negative range.begin counts backwards.
+ *    a.values_at(-50..3)                          # Raises RangeError.
  *
- *  Returns a new empty \Array if no arguments given.
+ *    a.values_at(1..-2)  # => ["b", "c"]          # Negative range.end counts backwards.
+ *    a.values_at(1..-50) # => []                  # No such elements.
  *
- *  For each negative +index+, counts backward from the end of the array:
+ *    # Mixture of specifiers.
+ *    a.values_at(2..3, 3, 0..1, 0) # => ["c", "d", "d", "a", "b", "a"]
  *
- *    a = [:foo, 'bar', 2]
- *    a.values_at(-1, -3) # => [2, :foo]
+ *  With no +specifiers+ given, returns a new empty array:
  *
- *  Assigns +nil+ for an +index+ that is too small:
+ *    a = ['a', 'b', 'c', 'd']
+ *    a.values_at # => []
  *
- *    a = [:foo, 'bar', 2]
- *    a.values_at(0, -5, 1, -6, 2) # => [:foo, nil, "bar", nil, 2]
+ *  For each numeric specifier +index+, includes an element:
  *
- *  The given +indexes+ may have a mixture of signs:
+ *  - For each non-negative numeric specifier +index+ that is in-range (less than <tt>self.size</tt>),
+ *    includes the element at offset +index+:
  *
- *    a = [:foo, 'bar', 2]
- *    a.values_at(0, -2, 1, -1) # => [:foo, "bar", "bar", 2]
+ *      a.values_at(0, 2)     # => ["a", "c"]
+ *      a.values_at(0.1, 2.9) # => ["a", "c"]
+ *
+ *  - For each negative numeric +index+ that is in-range (greater than or equal to <tt>- self.size</tt>),
+ *    counts backwards from the end of +self+:
+ *
+ *      a.values_at(-1, -4) # => ["d", "a"]
+ *
+ *  The given indexes may be in any order, and may repeat:
+ *
+ *    a.values_at(2, 0, 1, 0, 2) # => ["c", "a", "b", "a", "c"]
+ *
+ *  For each +index+ that is out-of-range, includes +nil+:
+ *
+ *    a.values_at(4, -5) # => [nil, nil]
+ *
+ *  For each Range specifier +range+, includes elements
+ *  according to <tt>range.begin</tt> and <tt>range.end</tt>:
+ *
+ *  - If both <tt>range.begin</tt> and <tt>range.end</tt>
+ *    are non-negative and in-range (less than <tt>self.size</tt>),
+ *    includes elements from index <tt>range.begin</tt>
+ *    through <tt>range.end - 1</tt> (if <tt>range.exclude_end?</tt>),
+ *    or through <tt>range.end</tt> (otherwise):
+ *
+ *      a.values_at(1..2)  # => ["b", "c"]
+ *      a.values_at(1...2) # => ["b"]
+ *
+ *  - If <tt>range.begin</tt> is negative and in-range (greater than or equal to <tt>- self.size</tt>),
+ *    counts backwards from the end of +self+:
  *
+ *      a.values_at(-2..3) # => ["c", "d"]
+ *
+ *  - If <tt>range.begin</tt> is negative and out-of-range, raises an exception:
+ *
+ *      a.values_at(-5..3) # Raises RangeError.
+ *
+ *  - If <tt>range.end</tt> is positive and out-of-range,
+ *    extends the returned array with +nil+ elements:
+ *
+ *      a.values_at(1..5) # => ["b", "c", "d", nil, nil]
+ *
+ *  - If <tt>range.end</tt> is negative and in-range,
+ *    counts backwards from the end of +self+:
+ *
+ *      a.values_at(1..-2) # => ["b", "c"]
+ *
+ *  - If <tt>range.end</tt> is negative and out-of-range,
+ *    returns an empty array:
+ *
+ *      a.values_at(1..-5) # => []
+ *
+ *  The given ranges may be in any order and may repeat:
+ *
+ *    a.values_at(2..3, 0..1, 2..3) # => ["c", "d", "a", "b", "c", "d"]
+ *
+ *  The given specifiers may be any mixture of indexes and ranges:
+ *
+ *    a.values_at(3, 1..2, 0, 2..3) # => ["d", "b", "c", "a", "c", "d"]
+ *
+ *  Related: see {Methods for Fetching}[rdoc-ref:Array@Methods+for+Fetching].
  */
 
 static VALUE
@@ -3902,7 +3965,7 @@ rb_ary_values_at(int argc, VALUE *argv, VALUE ary)
     long i, olen = RARRAY_LEN(ary);
     VALUE result = rb_ary_new_capa(argc);
     for (i = 0; i < argc; ++i) {
-	append_values_at_single(result, ary, olen, argv[i]);
+        append_values_at_single(result, ary, olen, argv[i]);
     }
     RB_GC_GUARD(ary);
     return result;
@@ -3911,23 +3974,22 @@ rb_ary_values_at(int argc, VALUE *argv, VALUE ary)
 
 /*
  *  call-seq:
- *    array.select {|element| ... } -> new_array
- *    array.select -> new_enumerator
+ *    select {|element| ... } -> new_array
+ *    select -> new_enumerator
+ *    filter {|element| ... } -> new_array
+ *    filter -> new_enumerator
  *
- *  Calls the block, if given, with each element of +self+;
- *  returns a new \Array containing those elements of +self+
+ *  With a block given, calls the block with each element of +self+;
+ *  returns a new array containing those elements of +self+
  *  for which the block returns a truthy value:
  *
  *    a = [:foo, 'bar', 2, :bam]
- *    a1 = a.select {|element| element.to_s.start_with?('b') }
- *    a1 # => ["bar", :bam]
- *
- *  Returns a new \Enumerator if no block given:
+ *    a.select {|element| element.to_s.start_with?('b') }
+ *    # => ["bar", :bam]
  *
- *    a = [:foo, 'bar', 2, :bam]
- *    a.select # => #<Enumerator: [:foo, "bar", 2, :bam]:select>
+ *  With no block given, returns a new Enumerator.
  *
- *  Array#filter is an alias for Array#select.
+ *  Related: see {Methods for Fetching}[rdoc-ref:Array@Methods+for+Fetching].
  */
 
 static VALUE
@@ -3939,9 +4001,9 @@ rb_ary_select(VALUE ary)
     RETURN_SIZED_ENUMERATOR(ary, 0, 0, ary_enum_length);
     result = rb_ary_new2(RARRAY_LEN(ary));
     for (i = 0; i < RARRAY_LEN(ary); i++) {
-	if (RTEST(rb_yield(RARRAY_AREF(ary, i)))) {
-	    rb_ary_push(result, rb_ary_elt(ary, i));
-	}
+        if (RTEST(rb_yield(RARRAY_AREF(ary, i)))) {
+            rb_ary_push(result, rb_ary_elt(ary, i));
+        }
     }
     return result;
 }
@@ -3959,12 +4021,12 @@ select_bang_i(VALUE a)
     long i1, i2;
 
     for (i1 = i2 = 0; i1 < RARRAY_LEN(ary); arg->len[0] = ++i1) {
-	VALUE v = RARRAY_AREF(ary, i1);
-	if (!RTEST(rb_yield(v))) continue;
-	if (i1 != i2) {
-	    rb_ary_store(ary, i2, v);
-	}
-	arg->len[1] = ++i2;
+        VALUE v = RARRAY_AREF(ary, i1);
+        if (!RTEST(rb_yield(v))) continue;
+        if (i1 != i2) {
+            rb_ary_store(ary, i2, v);
+        }
+        arg->len[1] = ++i2;
     }
     return (i1 == i2) ? Qnil : ary;
 }
@@ -3978,25 +4040,27 @@ select_bang_ensure(VALUE a)
     long i1 = arg->len[0], i2 = arg->len[1];
 
     if (i2 < len && i2 < i1) {
-	long tail = 0;
+        long tail = 0;
         rb_ary_modify(ary);
-	if (i1 < len) {
-	    tail = len - i1;
-            RARRAY_PTR_USE_TRANSIENT(ary, ptr, {
-		    MEMMOVE(ptr + i2, ptr + i1, VALUE, tail);
-		});
-	}
-	ARY_SET_LEN(ary, i2 + tail);
+        if (i1 < len) {
+            tail = len - i1;
+            RARRAY_PTR_USE(ary, ptr, {
+                    MEMMOVE(ptr + i2, ptr + i1, VALUE, tail);
+                });
+        }
+        ARY_SET_LEN(ary, i2 + tail);
     }
     return ary;
 }
 
 /*
  *  call-seq:
- *    array.select! {|element| ... } -> self or nil
- *    array.select! -> new_enumerator
+ *    select! {|element| ... } -> self or nil
+ *    select! -> new_enumerator
+ *    filter! {|element| ... } -> self or nil
+ *    filter! -> new_enumerator
  *
- *  Calls the block, if given  with each element of +self+;
+ *  With a block given, calls the block with each element of +self+;
  *  removes from +self+ those elements for which the block returns +false+ or +nil+.
  *
  *  Returns +self+ if any elements were removed:
@@ -4006,12 +4070,9 @@ select_bang_ensure(VALUE a)
  *
  *  Returns +nil+ if no elements were removed.
  *
- *  Returns a new \Enumerator if no block given:
- *
- *    a = [:foo, 'bar', 2, :bam]
- *    a.select! # => #<Enumerator: [:foo, "bar", 2, :bam]:select!>
+ *  With no block given, returns a new Enumerator.
  *
- *  Array#filter! is an alias for Array#select!.
+ *  Related: see {Methods for Deleting}[rdoc-ref:Array@Methods+for+Deleting].
  */
 
 static VALUE
@@ -4029,20 +4090,18 @@ rb_ary_select_bang(VALUE ary)
 
 /*
  *  call-seq:
- *    array.keep_if {|element| ... } -> self
- *    array.keep_if -> new_enumeration
+ *    keep_if {|element| ... } -> self
+ *    keep_if -> new_enumerator
  *
- *  Retains those elements for which the block returns a truthy value;
- *  deletes all other elements; returns +self+:
+ *  With a block given, calls the block with each element of +self+;
+ *  removes the element from +self+ if the block does not return a truthy value:
  *
  *    a = [:foo, 'bar', 2, :bam]
  *    a.keep_if {|element| element.to_s.start_with?('b') } # => ["bar", :bam]
  *
- *  Returns a new \Enumerator if no block given:
- *
- *    a = [:foo, 'bar', 2, :bam]
- *    a.keep_if # => #<Enumerator: [:foo, "bar", 2, :bam]:keep_if>
+ *  With no block given, returns a new Enumerator.
  *
+ *  Related: see {Methods for Deleting}[rdoc-ref:Array@Methods+for+Deleting].
  */
 
 static VALUE
@@ -4058,48 +4117,49 @@ ary_resize_smaller(VALUE ary, long len)
 {
     rb_ary_modify(ary);
     if (RARRAY_LEN(ary) > len) {
-	ARY_SET_LEN(ary, len);
-	if (len * 2 < ARY_CAPA(ary) &&
-	    ARY_CAPA(ary) > ARY_DEFAULT_SIZE) {
-	    ary_resize_capa(ary, len * 2);
-	}
+        ARY_SET_LEN(ary, len);
+        if (len * 2 < ARY_CAPA(ary) &&
+            ARY_CAPA(ary) > ARY_DEFAULT_SIZE) {
+            ary_resize_capa(ary, len * 2);
+        }
     }
 }
 
 /*
  *  call-seq:
- *    array.delete(obj) -> deleted_object
- *    array.delete(obj) {|nosuch| ... } -> deleted_object or block_return
+ *    delete(object) -> last_removed_object
+ *    delete(object) {|element| ... } -> last_removed_object or block_return
  *
  *  Removes zero or more elements from +self+.
  *
- *  When no block is given,
- *  removes from +self+ each element +ele+ such that <tt>ele == obj</tt>;
- *  returns the last deleted element:
+ *  With no block given,
+ *  removes from +self+ each element +ele+ such that <tt>ele == object</tt>;
+ *  returns the last removed element:
  *
- *    s1 = 'bar'; s2 = 'bar'
- *    a = [:foo, s1, 2, s2]
- *    a.delete('bar') # => "bar"
- *    a # => [:foo, 2]
+ *    a = [0, 1, 2, 2.0]
+ *    a.delete(2) # => 2.0
+ *    a           # => [0, 1]
  *
- *  Returns +nil+ if no elements removed.
+ *  Returns +nil+ if no elements removed:
+ *
+ *    a.delete(2) # => nil
  *
- *  When a block is given,
- *  removes from +self+ each element +ele+ such that <tt>ele == obj</tt>.
+ *  With a block given,
+ *  removes from +self+ each element +ele+ such that <tt>ele == object</tt>.
  *
  *  If any such elements are found, ignores the block
- *  and returns the last deleted element:
+ *  and returns the last removed element:
  *
- *    s1 = 'bar'; s2 = 'bar'
- *    a = [:foo, s1, 2, s2]
- *    deleted_obj = a.delete('bar') {|obj| fail 'Cannot happen' }
- *    a # => [:foo, 2]
+ *    a = [0, 1, 2, 2.0]
+ *    a.delete(2) {|element| fail 'Cannot happen' } # => 2.0
+ *    a                                             # => [0, 1]
  *
- *  If no such elements are found, returns the block's return value:
+ *  If no such element is found, returns the block's return value:
  *
- *    a = [:foo, 'bar', 2]
- *    a.delete(:nosuch) {|obj| "#{obj} not found" } # => "nosuch not found"
+ *    a.delete(2) {|element| "Element #{element} not found." }
+ *    # => "Element 2 not found."
  *
+ *  Related: see {Methods for Deleting}[rdoc-ref:Array@Methods+for+Deleting].
  */
 
 VALUE
@@ -4109,22 +4169,22 @@ rb_ary_delete(VALUE ary, VALUE item)
     long i1, i2;
 
     for (i1 = i2 = 0; i1 < RARRAY_LEN(ary); i1++) {
-	VALUE e = RARRAY_AREF(ary, i1);
+        VALUE e = RARRAY_AREF(ary, i1);
 
-	if (rb_equal(e, item)) {
-	    v = e;
-	    continue;
-	}
-	if (i1 != i2) {
-	    rb_ary_store(ary, i2, e);
-	}
-	i2++;
+        if (rb_equal(e, item)) {
+            v = e;
+            continue;
+        }
+        if (i1 != i2) {
+            rb_ary_store(ary, i2, e);
+        }
+        i2++;
     }
     if (RARRAY_LEN(ary) == i2) {
-	if (rb_block_given_p()) {
-	    return rb_yield(item);
-	}
-	return Qnil;
+        if (rb_block_given_p()) {
+            return rb_yield(item);
+        }
+        return Qnil;
     }
 
     ary_resize_smaller(ary, i2);
@@ -4139,18 +4199,18 @@ rb_ary_delete_same(VALUE ary, VALUE item)
     long i1, i2;
 
     for (i1 = i2 = 0; i1 < RARRAY_LEN(ary); i1++) {
-	VALUE e = RARRAY_AREF(ary, i1);
+        VALUE e = RARRAY_AREF(ary, i1);
 
-	if (e == item) {
-	    continue;
-	}
-	if (i1 != i2) {
-	    rb_ary_store(ary, i2, e);
-	}
-	i2++;
+        if (e == item) {
+            continue;
+        }
+        if (i1 != i2) {
+            rb_ary_store(ary, i2, e);
+        }
+        i2++;
     }
     if (RARRAY_LEN(ary) == i2) {
-	return;
+        return;
     }
 
     ary_resize_smaller(ary, i2);
@@ -4164,13 +4224,13 @@ rb_ary_delete_at(VALUE ary, long pos)
 
     if (pos >= len) return Qnil;
     if (pos < 0) {
-	pos += len;
-	if (pos < 0) return Qnil;
+        pos += len;
+        if (pos < 0) return Qnil;
     }
 
     rb_ary_modify(ary);
     del = RARRAY_AREF(ary, pos);
-    RARRAY_PTR_USE_TRANSIENT(ary, ptr, {
+    RARRAY_PTR_USE(ary, ptr, {
         MEMMOVE(ptr+pos, ptr+pos+1, VALUE, len-pos-1);
     });
     ARY_INCREASE_LEN(ary, -1);
@@ -4180,9 +4240,10 @@ rb_ary_delete_at(VALUE ary, long pos)
 
 /*
  *  call-seq:
- *    array.delete_at(index) -> deleted_object or nil
+ *    delete_at(index) -> removed_object or nil
  *
- *  Deletes an element from +self+, per the given \Integer +index+.
+ *  Removes the element of +self+ at the given +index+, which must be an
+ *  {integer-convertible object}[rdoc-ref:implicit_conversion.rdoc@Integer-Convertible+Objects].
  *
  *  When +index+ is non-negative, deletes the element at offset +index+:
  *
@@ -4190,15 +4251,19 @@ rb_ary_delete_at(VALUE ary, long pos)
  *    a.delete_at(1) # => "bar"
  *    a # => [:foo, 2]
  *
- *  If index is too large, returns +nil+.
- *
  *  When +index+ is negative, counts backward from the end of the array:
  *
  *    a = [:foo, 'bar', 2]
  *    a.delete_at(-2) # => "bar"
  *    a # => [:foo, 2]
  *
- *  If +index+ is too small (far from zero), returns nil.
+ *  When +index+ is out of range, returns +nil+.
+ *
+ *    a = [:foo, 'bar', 2]
+ *    a.delete_at(3)  # => nil
+ *    a.delete_at(-4) # => nil
+ *
+ *  Related: see {Methods for Deleting}[rdoc-ref:Array@Methods+for+Deleting].
  */
 
 static VALUE
@@ -4231,7 +4296,7 @@ ary_slice_bang_by_rb_ary_splice(VALUE ary, long pos, long len)
         return rb_ary_new2(0);
     }
     else {
-        VALUE arg2 = rb_ary_new4(len, RARRAY_CONST_PTR_TRANSIENT(ary)+pos);
+        VALUE arg2 = rb_ary_new4(len, RARRAY_CONST_PTR(ary)+pos);
         rb_ary_splice(ary, pos, len, 0, 0);
         return arg2;
     }
@@ -4239,71 +4304,94 @@ ary_slice_bang_by_rb_ary_splice(VALUE ary, long pos, long len)
 
 /*
  *  call-seq:
- *    array.slice!(n) -> object or nil
- *    array.slice!(start, length) -> new_array or nil
- *    array.slice!(range) -> new_array or nil
+ *    slice!(index) -> object or nil
+ *    slice!(start, length) -> new_array or nil
+ *    slice!(range) -> new_array or nil
  *
  *  Removes and returns elements from +self+.
  *
- *  When the only argument is an \Integer +n+,
- *  removes and returns the _nth_ element in +self+:
+ *  With numeric argument +index+ given,
+ *  removes and returns the element at offset +index+:
  *
- *    a = [:foo, 'bar', 2]
- *    a.slice!(1) # => "bar"
- *    a # => [:foo, 2]
+ *    a = ['a', 'b', 'c', 'd']
+ *    a.slice!(2)   # => "c"
+ *    a             # => ["a", "b", "d"]
+ *    a.slice!(2.1) # => "d"
+ *    a             # => ["a", "b"]
  *
- *  If +n+ is negative, counts backwards from the end of +self+:
+ *  If +index+ is negative, counts backwards from the end of +self+:
  *
- *    a = [:foo, 'bar', 2]
- *    a.slice!(-1) # => 2
- *    a # => [:foo, "bar"]
+ *    a = ['a', 'b', 'c', 'd']
+ *    a.slice!(-2) # => "c"
+ *    a            # => ["a", "b", "d"]
  *
- *  If +n+ is out of range, returns +nil+.
+ *  If +index+ is out of range, returns +nil+.
  *
- *  When the only arguments are Integers +start+ and +length+,
- *  removes +length+ elements from +self+ beginning at offset  +start+;
- *  returns the deleted objects in a new \Array:
+ *  With numeric arguments +start+ and +length+ given,
+ *  removes +length+ elements from +self+ beginning at zero-based offset +start+;
+ *  returns the removed objects in a new array:
  *
- *    a = [:foo, 'bar', 2]
- *    a.slice!(0, 2) # => [:foo, "bar"]
- *    a # => [2]
+ *    a = ['a', 'b', 'c', 'd']
+ *    a.slice!(1, 2)     # => ["b", "c"]
+ *    a                  # => ["a", "d"]
+ *    a.slice!(0.1, 1.1) # => ["a"]
+ *    a                  # => ["d"]
+ *
+ *  If +start+ is negative, counts backwards from the end of +self+:
+ *
+ *    a = ['a', 'b', 'c', 'd']
+ *    a.slice!(-2, 1) # => ["c"]
+ *    a               # => ["a", "b", "d"]
+ *
+ *  If +start+ is out-of-range, returns +nil+:
+ *
+ *    a = ['a', 'b', 'c', 'd']
+ *    a.slice!(5, 1)  # => nil
+ *    a.slice!(-5, 1) # => nil
  *
  *  If <tt>start + length</tt> exceeds the array size,
  *  removes and returns all elements from offset +start+ to the end:
  *
- *    a = [:foo, 'bar', 2]
- *    a.slice!(1, 50) # => ["bar", 2]
- *    a # => [:foo]
+ *    a = ['a', 'b', 'c', 'd']
+ *    a.slice!(2, 50) # => ["c", "d"]
+ *    a               # => ["a", "b"]
  *
  *  If <tt>start == a.size</tt> and +length+ is non-negative,
- *  returns a new empty \Array.
+ *  returns a new empty array.
  *
  *  If +length+ is negative, returns +nil+.
  *
- *  When the only argument is a \Range object +range+,
- *  treats <tt>range.min</tt> as +start+ above and <tt>range.size</tt> as +length+ above:
+ *  With Range argument +range+ given,
+ *  treats <tt>range.min</tt> as +start+ (as above)
+ *  and <tt>range.size</tt> as +length+ (as above):
  *
- *    a = [:foo, 'bar', 2]
- *    a.slice!(1..2) # => ["bar", 2]
- *    a # => [:foo]
+ *    a = ['a', 'b', 'c', 'd']
+ *    a.slice!(1..2) # => ["b", "c"]
+ *    a              # => ["a", "d"]
  *
- *  If <tt>range.start == a.size</tt>, returns a new empty \Array.
+ *  If <tt>range.start == a.size</tt>, returns a new empty array:
  *
- *  If <tt>range.start</tt> is larger than the array size, returns +nil+.
+ *    a = ['a', 'b', 'c', 'd']
+ *    a.slice!(4..5) # => []
  *
- *  If <tt>range.end</tt> is negative, counts backwards from the end of the array:
+ *  If <tt>range.start</tt> is larger than the array size, returns +nil+:
  *
- *    a = [:foo, 'bar', 2]
- *    a.slice!(0..-2) # => [:foo, "bar"]
- *    a # => [2]
+ *    a = ['a', 'b', 'c', 'd']
+      a.slice!(5..6) # => nil
  *
  *  If <tt>range.start</tt> is negative,
- *  calculates the start index backwards from the end of the array:
+ *  calculates the start index by counting backwards from the end of +self+:
  *
- *    a = [:foo, 'bar', 2]
- *    a.slice!(-2..2) # => ["bar", 2]
- *    a # => [:foo]
+ *    a = ['a', 'b', 'c', 'd']
+ *    a.slice!(-2..2) # => ["c"]
  *
+ *  If <tt>range.end</tt> is negative,
+ *  calculates the end index by counting backwards from the end of +self+:
+ *
+ *    a = ['a', 'b', 'c', 'd']
+ *    a.slice!(0..-2) # => ["a", "b", "c"]
+ *
+ *  Related: see {Methods for Deleting}[rdoc-ref:Array@Methods+for+Deleting].
  */
 
 static VALUE
@@ -4317,23 +4405,23 @@ rb_ary_slice_bang(int argc, VALUE *argv, VALUE ary)
     arg1 = argv[0];
 
     if (argc == 2) {
-	pos = NUM2LONG(argv[0]);
-	len = NUM2LONG(argv[1]);
+        pos = NUM2LONG(argv[0]);
+        len = NUM2LONG(argv[1]);
         return ary_slice_bang_by_rb_ary_splice(ary, pos, len);
     }
 
     if (!FIXNUM_P(arg1)) {
-	switch (rb_range_beg_len(arg1, &pos, &len, RARRAY_LEN(ary), 0)) {
-	  case Qtrue:
-	    /* valid range */
+        switch (rb_range_beg_len(arg1, &pos, &len, RARRAY_LEN(ary), 0)) {
+          case Qtrue:
+            /* valid range */
             return ary_slice_bang_by_rb_ary_splice(ary, pos, len);
-	  case Qnil:
-	    /* invalid range */
-	    return Qnil;
-	  default:
-	    /* not a range */
-	    break;
-	}
+          case Qnil:
+            /* invalid range */
+            return Qnil;
+          default:
+            /* not a range */
+            break;
+        }
     }
 
     return rb_ary_delete_at(ary, NUM2LONG(arg1));
@@ -4345,11 +4433,11 @@ ary_reject(VALUE orig, VALUE result)
     long i;
 
     for (i = 0; i < RARRAY_LEN(orig); i++) {
-	VALUE v = RARRAY_AREF(orig, i);
+        VALUE v = RARRAY_AREF(orig, i);
 
         if (!RTEST(rb_yield(v))) {
-	    rb_ary_push(result, v);
-	}
+            rb_ary_push(result, v);
+        }
     }
     return result;
 }
@@ -4362,12 +4450,12 @@ reject_bang_i(VALUE a)
     long i1, i2;
 
     for (i1 = i2 = 0; i1 < RARRAY_LEN(ary); arg->len[0] = ++i1) {
-	VALUE v = RARRAY_AREF(ary, i1);
-	if (RTEST(rb_yield(v))) continue;
-	if (i1 != i2) {
-	    rb_ary_store(ary, i2, v);
-	}
-	arg->len[1] = ++i2;
+        VALUE v = RARRAY_AREF(ary, i1);
+        if (RTEST(rb_yield(v))) continue;
+        if (i1 != i2) {
+            rb_ary_store(ary, i2, v);
+        }
+        arg->len[1] = ++i2;
     }
     return (i1 == i2) ? Qnil : ary;
 }
@@ -4384,10 +4472,11 @@ ary_reject_bang(VALUE ary)
 
 /*
  *  call-seq:
- *    array.reject! {|element| ... } -> self or nil
- *    array.reject! -> new_enumerator
+ *    reject! {|element| ... } -> self or nil
+ *    reject! -> new_enumerator
  *
- *  Removes each element for which the block returns a truthy value.
+ *  With a block given, calls the block with each element of +self+;
+ *  removes each element for which the block returns a truthy value.
  *
  *  Returns +self+ if any elements removed:
  *
@@ -4396,11 +4485,9 @@ ary_reject_bang(VALUE ary)
  *
  *  Returns +nil+ if no elements removed.
  *
- *  Returns a new \Enumerator if no block given:
- *
- *    a = [:foo, 'bar', 2]
- *    a.reject! # => #<Enumerator: [:foo, "bar", 2]:reject!>
+ *  With no block given, returns a new Enumerator.
  *
+ *  Related: see {Methods for Deleting}[rdoc-ref:Array@Methods+for+Deleting].
  */
 
 static VALUE
@@ -4413,21 +4500,19 @@ rb_ary_reject_bang(VALUE ary)
 
 /*
  *  call-seq:
- *    array.reject {|element| ... } -> new_array
- *    array.reject -> new_enumerator
+ *    reject {|element| ... } -> new_array
+ *    reject -> new_enumerator
  *
- *  Returns a new \Array whose elements are all those from +self+
+ *  With a block given, returns a new array whose elements are all those from +self+
  *  for which the block returns +false+ or +nil+:
  *
  *    a = [:foo, 'bar', 2, 'bat']
  *    a1 = a.reject {|element| element.to_s.start_with?('b') }
  *    a1 # => [:foo, 2]
  *
- *  Returns a new \Enumerator if no block given:
- *
- *     a = [:foo, 'bar', 2]
- *     a.reject # => #<Enumerator: [:foo, "bar", 2]:reject>
+ *  With no block given, returns a new Enumerator.
  *
+ *  Related: {Methods for Fetching}[rdoc-ref:Array@Methods+for+Fetching].
  */
 
 static VALUE
@@ -4443,21 +4528,20 @@ rb_ary_reject(VALUE ary)
 
 /*
  *  call-seq:
- *    array.delete_if {|element| ... } -> self
- *    array.delete_if -> Enumerator
+ *    delete_if {|element| ... } -> self
+ *    delete_if -> new_numerator
  *
- *  Removes each element in +self+ for which the block returns a truthy value;
+ *  With a block given, calls the block with each element of +self+;
+ *  removes the element if the block returns a truthy value;
  *  returns +self+:
  *
  *    a = [:foo, 'bar', 2, 'bat']
  *    a.delete_if {|element| element.to_s.start_with?('b') } # => [:foo, 2]
  *
- *  Returns a new \Enumerator if no block given:
- *
- *    a = [:foo, 'bar', 2]
- *    a.delete_if # => #<Enumerator: [:foo, "bar", 2]:delete_if>
+ *  With no block given, returns a new Enumerator.
  *
-3 */
+ *  Related: see {Methods for Deleting}[rdoc-ref:Array@Methods+for+Deleting].
+ */
 
 static VALUE
 rb_ary_delete_if(VALUE ary)
@@ -4488,67 +4572,104 @@ take_items(VALUE obj, long n)
     if (!NIL_P(result)) return rb_ary_subseq(result, 0, n);
     result = rb_ary_new2(n);
     args[0] = result; args[1] = (VALUE)n;
-    if (rb_check_block_call(obj, idEach, 0, 0, take_i, (VALUE)args) == Qundef)
-	rb_raise(rb_eTypeError, "wrong argument type %"PRIsVALUE" (must respond to :each)",
-		 rb_obj_class(obj));
+    if (UNDEF_P(rb_check_block_call(obj, idEach, 0, 0, take_i, (VALUE)args)))
+        rb_raise(rb_eTypeError, "wrong argument type %"PRIsVALUE" (must respond to :each)",
+                 rb_obj_class(obj));
     return result;
 }
 
 
 /*
  *  call-seq:
- *    array.zip(*other_arrays) -> new_array
- *    array.zip(*other_arrays) {|other_array| ... } -> nil
+ *    zip(*other_arrays) -> new_array
+ *    zip(*other_arrays) {|sub_array| ... } -> nil
+ *
+ *  With no block given, combines +self+ with the collection of +other_arrays+;
+ *  returns a new array of sub-arrays:
+ *
+ *    [0, 1].zip(['zero', 'one'], [:zero, :one])
+ *    # => [[0, "zero", :zero], [1, "one", :one]]
+ *
+ *  Returned:
  *
- *  When no block given, returns a new \Array +new_array+ of size <tt>self.size</tt>
- *  whose elements are Arrays.
+ *  - The outer array is of size <tt>self.size</tt>.
+ *  - Each sub-array is of size <tt>other_arrays.size + 1</tt>.
+ *  - The _nth_ sub-array contains (in order):
  *
- *  Each nested array <tt>new_array[n]</tt> is of size <tt>other_arrays.size+1</tt>,
- *  and contains:
+ *    - The _nth_ element of +self+.
+ *    - The _nth_ element of each of the other arrays, as available.
  *
- *  - The _nth_ element of +self+.
- *  - The _nth_ element of each of the +other_arrays+.
+ *  Example:
+ *
+ *    a = [0, 1]
+ *    zipped = a.zip(['zero', 'one'], [:zero, :one])
+ *    # => [[0, "zero", :zero], [1, "one", :one]]
+ *    zipped.size       # => 2 # Same size as a.
+ *    zipped.first.size # => 3 # Size of other arrays plus 1.
  *
- *  If all +other_arrays+ and +self+ are the same size:
+ *  When the other arrays are all the same size as +self+,
+ *  the returned sub-arrays are a rearrangement containing exactly elements of all the arrays
+ *  (including +self+), with no omissions or additions:
  *
  *    a = [:a0, :a1, :a2, :a3]
  *    b = [:b0, :b1, :b2, :b3]
  *    c = [:c0, :c1, :c2, :c3]
  *    d = a.zip(b, c)
- *    d # => [[:a0, :b0, :c0], [:a1, :b1, :c1], [:a2, :b2, :c2], [:a3, :b3, :c3]]
+ *    pp d
+ *    # =>
+ *    [[:a0, :b0, :c0],
+ *     [:a1, :b1, :c1],
+ *     [:a2, :b2, :c2],
+ *     [:a3, :b3, :c3]]
  *
- *  If any array in +other_arrays+ is smaller than +self+,
- *  fills to <tt>self.size</tt> with +nil+:
+ *  When one of the other arrays is smaller than +self+,
+ *  pads the corresponding sub-array with +nil+ elements:
  *
  *    a = [:a0, :a1, :a2, :a3]
  *    b = [:b0, :b1, :b2]
  *    c = [:c0, :c1]
  *    d = a.zip(b, c)
- *    d # => [[:a0, :b0, :c0], [:a1, :b1, :c1], [:a2, :b2, nil], [:a3, nil, nil]]
+ *    pp d
+ *    # =>
+ *    [[:a0, :b0, :c0],
+ *     [:a1, :b1, :c1],
+ *     [:a2, :b2, nil],
+ *     [:a3, nil, nil]]
  *
- *  If any array in +other_arrays+ is larger than +self+,
- *  its trailing elements are ignored:
+ *  When one of the other arrays is larger than +self+,
+ *  _ignores_ its trailing elements:
  *
  *    a = [:a0, :a1, :a2, :a3]
  *    b = [:b0, :b1, :b2, :b3, :b4]
  *    c = [:c0, :c1, :c2, :c3, :c4, :c5]
  *    d = a.zip(b, c)
- *    d # => [[:a0, :b0, :c0], [:a1, :b1, :c1], [:a2, :b2, :c2], [:a3, :b3, :c3]]
+ *    pp d
+ *    # =>
+ *    [[:a0, :b0, :c0],
+ *     [:a1, :b1, :c1],
+ *     [:a2, :b2, :c2],
+ *     [:a3, :b3, :c3]]
  *
- *  When a block is given, calls the block with each of the sub-arrays (formed as above); returns +nil+:
+ *  With a block given, calls the block with each of the other arrays;
+ *  returns +nil+:
  *
+ *    d = []
  *    a = [:a0, :a1, :a2, :a3]
  *    b = [:b0, :b1, :b2, :b3]
  *    c = [:c0, :c1, :c2, :c3]
- *    a.zip(b, c) {|sub_array| p sub_array} # => nil
- *
- *  Output:
- *
- *    [:a0, :b0, :c0]
- *    [:a1, :b1, :c1]
- *    [:a2, :b2, :c2]
- *    [:a3, :b3, :c3]
- *
+ *    a.zip(b, c) {|sub_array| d.push(sub_array.reverse) } # => nil
+ *    pp d
+ *    # =>
+ *    [[:c0, :b0, :a0],
+ *     [:c1, :b1, :a1],
+ *     [:c2, :b2, :a2],
+ *     [:c3, :b3, :a3]]
+ *
+ *  For an *object* in *other_arrays* that is not actually an array,
+ *  forms the "other array" as <tt>object.to_ary</tt>, if defined,
+ *  or as <tt>object.each.to_a</tt> otherwise.
+ *
+ *  Related: see {Methods for Converting}[rdoc-ref:Array@Methods+for+Converting].
  */
 
 static VALUE
@@ -4559,51 +4680,51 @@ rb_ary_zip(int argc, VALUE *argv, VALUE ary)
     VALUE result = Qnil;
 
     for (i=0; i<argc; i++) {
-	argv[i] = take_items(argv[i], len);
+        argv[i] = take_items(argv[i], len);
     }
 
     if (rb_block_given_p()) {
-	int arity = rb_block_arity();
-
-	if (arity > 1) {
-	    VALUE work, *tmp;
-
-	    tmp = ALLOCV_N(VALUE, work, argc+1);
-
-	    for (i=0; i<RARRAY_LEN(ary); i++) {
-		tmp[0] = RARRAY_AREF(ary, i);
-		for (j=0; j<argc; j++) {
-		    tmp[j+1] = rb_ary_elt(argv[j], i);
-		}
-		rb_yield_values2(argc+1, tmp);
-	    }
-
-	    if (work) ALLOCV_END(work);
-	}
-	else {
-	    for (i=0; i<RARRAY_LEN(ary); i++) {
-		VALUE tmp = rb_ary_new2(argc+1);
-
-		rb_ary_push(tmp, RARRAY_AREF(ary, i));
-		for (j=0; j<argc; j++) {
-		    rb_ary_push(tmp, rb_ary_elt(argv[j], i));
-		}
-		rb_yield(tmp);
-	    }
-	}
+        int arity = rb_block_arity();
+
+        if (arity > 1) {
+            VALUE work, *tmp;
+
+            tmp = ALLOCV_N(VALUE, work, argc+1);
+
+            for (i=0; i<RARRAY_LEN(ary); i++) {
+                tmp[0] = RARRAY_AREF(ary, i);
+                for (j=0; j<argc; j++) {
+                    tmp[j+1] = rb_ary_elt(argv[j], i);
+                }
+                rb_yield_values2(argc+1, tmp);
+            }
+
+            if (work) ALLOCV_END(work);
+        }
+        else {
+            for (i=0; i<RARRAY_LEN(ary); i++) {
+                VALUE tmp = rb_ary_new2(argc+1);
+
+                rb_ary_push(tmp, RARRAY_AREF(ary, i));
+                for (j=0; j<argc; j++) {
+                    rb_ary_push(tmp, rb_ary_elt(argv[j], i));
+                }
+                rb_yield(tmp);
+            }
+        }
     }
     else {
-	result = rb_ary_new_capa(len);
+        result = rb_ary_new_capa(len);
 
-	for (i=0; i<len; i++) {
-	    VALUE tmp = rb_ary_new_capa(argc+1);
+        for (i=0; i<len; i++) {
+            VALUE tmp = rb_ary_new_capa(argc+1);
 
-	    rb_ary_push(tmp, RARRAY_AREF(ary, i));
-	    for (j=0; j<argc; j++) {
-		rb_ary_push(tmp, rb_ary_elt(argv[j], i));
-	    }
-	    rb_ary_push(result, tmp);
-	}
+            rb_ary_push(tmp, RARRAY_AREF(ary, i));
+            for (j=0; j<argc; j++) {
+                rb_ary_push(tmp, rb_ary_elt(argv[j], i));
+            }
+            rb_ary_push(result, tmp);
+        }
     }
 
     return result;
@@ -4611,14 +4732,17 @@ rb_ary_zip(int argc, VALUE *argv, VALUE ary)
 
 /*
  *  call-seq:
- *    array.transpose -> new_array
+ *    transpose -> new_array
  *
- *  Transposes the rows and columns in an \Array of Arrays;
- *  the nested Arrays must all be the same size:
+ *  Returns a new array that is +self+
+ *  as a {transposed matrix}[https://en.wikipedia.org/wiki/Transpose]:
  *
  *    a = [[:a0, :a1], [:b0, :b1], [:c0, :c1]]
  *    a.transpose # => [[:a0, :b0, :c0], [:a1, :b1, :c1]]
  *
+ *  The elements of +self+ must all be the same size.
+ *
+ *  Related: see {Methods for Converting}[rdoc-ref:Array@Methods+for+Converting].
  */
 
 static VALUE
@@ -4630,34 +4754,38 @@ rb_ary_transpose(VALUE ary)
     alen = RARRAY_LEN(ary);
     if (alen == 0) return rb_ary_dup(ary);
     for (i=0; i<alen; i++) {
-	tmp = to_ary(rb_ary_elt(ary, i));
-	if (elen < 0) {		/* first element */
-	    elen = RARRAY_LEN(tmp);
-	    result = rb_ary_new2(elen);
-	    for (j=0; j<elen; j++) {
-		rb_ary_store(result, j, rb_ary_new2(alen));
-	    }
-	}
-	else if (elen != RARRAY_LEN(tmp)) {
-	    rb_raise(rb_eIndexError, "element size differs (%ld should be %ld)",
-		     RARRAY_LEN(tmp), elen);
-	}
-	for (j=0; j<elen; j++) {
-	    rb_ary_store(rb_ary_elt(result, j), i, rb_ary_elt(tmp, j));
-	}
+        tmp = to_ary(rb_ary_elt(ary, i));
+        if (elen < 0) {		/* first element */
+            elen = RARRAY_LEN(tmp);
+            result = rb_ary_new2(elen);
+            for (j=0; j<elen; j++) {
+                rb_ary_store(result, j, rb_ary_new2(alen));
+            }
+        }
+        else if (elen != RARRAY_LEN(tmp)) {
+            rb_raise(rb_eIndexError, "element size differs (%ld should be %ld)",
+                     RARRAY_LEN(tmp), elen);
+        }
+        for (j=0; j<elen; j++) {
+            rb_ary_store(rb_ary_elt(result, j), i, rb_ary_elt(tmp, j));
+        }
     }
     return result;
 }
 
 /*
  *  call-seq:
- *    array.replace(other_array) -> self
+ *    initialize_copy(other_array) -> self
+ *    replace(other_array) -> self
  *
- *  Replaces the content of +self+ with the content of +other_array+; returns +self+:
+ *  Replaces the elements of +self+ with the elements of +other_array+, which must be an
+ *  {array-convertible object}[rdoc-ref:implicit_conversion.rdoc@Array-Convertible+Objects];
+ *  returns +self+:
  *
- *    a = [:foo, 'bar', 2]
- *    a.replace(['foo', :bar, 3]) # => ["foo", :bar, 3]
+ *    a = ['a', 'b', 'c']   # => ["a", "b", "c"]
+ *    a.replace(['d', 'e']) # => ["d", "e"]
  *
+ *  Related: see {Methods for Assigning}[rdoc-ref:Array@Methods+for+Assigning].
  */
 
 VALUE
@@ -4671,16 +4799,15 @@ rb_ary_replace(VALUE copy, VALUE orig)
 
     /* orig has enough space to embed the contents of orig. */
     if (RARRAY_LEN(orig) <= ary_embed_capa(copy)) {
-        assert(ARY_EMBED_P(copy));
-        ary_memcpy(copy, 0, RARRAY_LEN(orig), RARRAY_CONST_PTR_TRANSIENT(orig));
+        RUBY_ASSERT(ARY_EMBED_P(copy));
+        ary_memcpy(copy, 0, RARRAY_LEN(orig), RARRAY_CONST_PTR(orig));
         ARY_SET_EMBED_LEN(copy, RARRAY_LEN(orig));
     }
-#if USE_RVARGC
     /* orig is embedded but copy does not have enough space to embed the
      * contents of orig. */
     else if (ARY_EMBED_P(orig)) {
         long len = ARY_EMBED_LEN(orig);
-        VALUE *ptr = ary_heap_alloc(copy, len);
+        VALUE *ptr = ary_heap_alloc_buffer(len);
 
         FL_UNSET_EMBED(copy);
         ARY_SET_PTR(copy, ptr);
@@ -4689,9 +4816,8 @@ rb_ary_replace(VALUE copy, VALUE orig)
 
         // No allocation and exception expected that could leave `copy` in a
         // bad state from the edits above.
-        ary_memcpy(copy, 0, len, RARRAY_CONST_PTR_TRANSIENT(orig));
+        ary_memcpy(copy, 0, len, RARRAY_CONST_PTR(orig));
     }
-#endif
     /* Otherwise, orig is on heap and copy does not have enough space to embed
      * the contents of orig. */
     else {
@@ -4700,6 +4826,8 @@ rb_ary_replace(VALUE copy, VALUE orig)
         ARY_SET_PTR(copy, ARY_HEAP_PTR(orig));
         ARY_SET_LEN(copy, ARY_HEAP_LEN(orig));
         rb_ary_set_shared(copy, shared_root);
+
+        RUBY_ASSERT(RB_OBJ_SHAREABLE_P(copy) ? RB_OBJ_SHAREABLE_P(shared_root) : 1);
     }
     ary_verify(copy);
     return copy;
@@ -4707,13 +4835,14 @@ rb_ary_replace(VALUE copy, VALUE orig)
 
 /*
  *  call-seq:
- *     array.clear -> self
+ *    clear -> self
  *
- *  Removes all elements from +self+:
+ *  Removes all elements from +self+; returns +self+:
  *
  *    a = [:foo, 'bar', 2]
  *    a.clear # => []
  *
+ *  Related: see {Methods for Deleting}[rdoc-ref:Array@Methods+for+Deleting].
  */
 
 VALUE
@@ -4721,11 +4850,9 @@ rb_ary_clear(VALUE ary)
 {
     rb_ary_modify_check(ary);
     if (ARY_SHARED_P(ary)) {
-	if (!ARY_EMBED_P(ary)) {
-	    rb_ary_unshare(ary);
-	    FL_SET_EMBED(ary);
-            ARY_SET_EMBED_LEN(ary, 0);
-	}
+        rb_ary_unshare(ary);
+        FL_SET_EMBED(ary);
+        ARY_SET_EMBED_LEN(ary, 0);
     }
     else {
         ARY_SET_LEN(ary, 0);
@@ -4739,198 +4866,182 @@ rb_ary_clear(VALUE ary)
 
 /*
  *  call-seq:
- *    array.fill(obj) -> self
- *    array.fill(obj, start) -> self
- *    array.fill(obj, start, length) -> self
- *    array.fill(obj, range) -> self
- *    array.fill {|index| ... } -> self
- *    array.fill(start) {|index| ... } -> self
- *    array.fill(start, length) {|index| ... } -> self
- *    array.fill(range) {|index| ... } -> self
+ *    fill(object, start = nil, count = nil) -> self
+ *    fill(object, range) -> self
+ *    fill(start = nil, count = nil) {|element| ... } -> self
+ *    fill(range) {|element| ... } -> self
  *
- *  Replaces specified elements in +self+ with specified objects; returns +self+.
+ *  Replaces selected elements in +self+;
+ *  may add elements to +self+;
+ *  always returns +self+ (never a new array).
  *
- *  With argument +obj+ and no block given, replaces all elements with that one object:
+ *  In brief:
  *
- *    a = ['a', 'b', 'c', 'd']
- *    a # => ["a", "b", "c", "d"]
- *    a.fill(:X) # => [:X, :X, :X, :X]
+ *    # Non-negative start.
+ *    ['a', 'b', 'c', 'd'].fill('-', 1, 2)          # => ["a", "-", "-", "d"]
+ *    ['a', 'b', 'c', 'd'].fill(1, 2) {|e| e.to_s } # => ["a", "1", "2", "d"]
  *
- *  With arguments +obj+ and \Integer +start+, and no block given,
- *  replaces elements based on the given start.
+ *    # Extends with specified values if necessary.
+ *    ['a', 'b', 'c', 'd'].fill('-', 3, 2)          # => ["a", "b", "c", "-", "-"]
+ *    ['a', 'b', 'c', 'd'].fill(3, 2) {|e| e.to_s } # => ["a", "b", "c", "3", "4"]
  *
- *  If +start+ is in range (<tt>0 <= start < array.size</tt>),
- *  replaces all elements from offset +start+ through the end:
+ *    # Fills with nils if necessary.
+ *    ['a', 'b', 'c', 'd'].fill('-', 6, 2)          # => ["a", "b", "c", "d", nil, nil, "-", "-"]
+ *    ['a', 'b', 'c', 'd'].fill(6, 2) {|e| e.to_s } # => ["a", "b", "c", "d", nil, nil, "6", "7"]
  *
- *    a = ['a', 'b', 'c', 'd']
- *    a.fill(:X, 2) # => ["a", "b", :X, :X]
+ *    # For negative start, counts backwards from the end.
+ *    ['a', 'b', 'c', 'd'].fill('-', -3, 3)          # => ["a", "-", "-", "-"]
+ *    ['a', 'b', 'c', 'd'].fill(-3, 3) {|e| e.to_s } # => ["a", "1", "2", "3"]
  *
- *  If +start+ is too large (<tt>start >= array.size</tt>), does nothing:
+ *    # Range.
+ *    ['a', 'b', 'c', 'd'].fill('-', 1..2)          # => ["a", "-", "-", "d"]
+ *    ['a', 'b', 'c', 'd'].fill(1..2) {|e| e.to_s } # => ["a", "1", "2", "d"]
  *
- *    a = ['a', 'b', 'c', 'd']
- *    a.fill(:X, 4) # => ["a", "b", "c", "d"]
- *    a = ['a', 'b', 'c', 'd']
- *    a.fill(:X, 5) # => ["a", "b", "c", "d"]
+ *  When arguments +start+ and +count+ are given,
+ *  they select the elements of +self+ to be replaced;
+ *  each must be an
+ *  {integer-convertible object}[rdoc-ref:implicit_conversion.rdoc@Integer-Convertible+Objects]
+ *  (or +nil+):
  *
- *  If +start+ is negative, counts from the end (starting index is <tt>start + array.size</tt>):
+ *  - +start+ specifies the zero-based offset of the first element to be replaced;
+ *    +nil+ means zero.
+ *  - +count+ is the number of consecutive elements to be replaced;
+ *    +nil+ means "all the rest."
  *
- *    a = ['a', 'b', 'c', 'd']
- *    a.fill(:X, -2) # => ["a", "b", :X, :X]
+ *  With argument +object+ given,
+ *  that one object is used for all replacements:
  *
- *  If +start+ is too small (less than and far from zero), replaces all elements:
+ *    o = Object.new           # => #<Object:0x0000014e7bff7600>
+ *    a = ['a', 'b', 'c', 'd'] # => ["a", "b", "c", "d"]
+ *    a.fill(o, 1, 2)
+ *    # => ["a", #<Object:0x0000014e7bff7600>, #<Object:0x0000014e7bff7600>, "d"]
  *
- *    a = ['a', 'b', 'c', 'd']
- *    a.fill(:X, -6) # => [:X, :X, :X, :X]
- *    a = ['a', 'b', 'c', 'd']
- *    a.fill(:X, -50) # => [:X, :X, :X, :X]
+ *  With a block given, the block is called once for each element to be replaced;
+ *  the value passed to the block is the _index_ of the element to be replaced
+ *  (not the element itself);
+ *  the block's return value replaces the element:
  *
- *  With arguments +obj+, \Integer +start+, and \Integer +length+, and no block given,
- *  replaces elements based on the given +start+ and +length+.
+ *    a = ['a', 'b', 'c', 'd']               # => ["a", "b", "c", "d"]
+ *    a.fill(1, 2) {|element| element.to_s } # => ["a", "1", "2", "d"]
  *
- *  If +start+ is in range, replaces +length+ elements beginning at offset +start+:
+ *  For arguments +start+ and +count+:
  *
- *    a = ['a', 'b', 'c', 'd']
- *    a.fill(:X, 1, 1) # => ["a", :X, "c", "d"]
+ *  - If +start+ is non-negative,
+ *    replaces +count+ elements beginning at offset +start+:
  *
- *  If +start+ is negative, counts from the end:
+ *      ['a', 'b', 'c', 'd'].fill('-', 0, 2) # => ["-", "-", "c", "d"]
+ *      ['a', 'b', 'c', 'd'].fill('-', 1, 2) # => ["a", "-", "-", "d"]
+ *      ['a', 'b', 'c', 'd'].fill('-', 2, 2) # => ["a", "b", "-", "-"]
  *
- *    a = ['a', 'b', 'c', 'd']
- *    a.fill(:X, -2, 1) # => ["a", "b", :X, "d"]
+ *      ['a', 'b', 'c', 'd'].fill(0, 2) {|e| e.to_s } # => ["0", "1", "c", "d"]
+ *      ['a', 'b', 'c', 'd'].fill(1, 2) {|e| e.to_s } # => ["a", "1", "2", "d"]
+ *      ['a', 'b', 'c', 'd'].fill(2, 2) {|e| e.to_s } # => ["a", "b", "2", "3"]
  *
- *  If +start+ is large (<tt>start >= array.size</tt>), extends +self+ with +nil+:
+ *    Extends +self+ if necessary:
  *
- *    a = ['a', 'b', 'c', 'd']
- *    a.fill(:X, 5, 0) # => ["a", "b", "c", "d", nil]
- *    a = ['a', 'b', 'c', 'd']
- *    a.fill(:X, 5, 2) # => ["a", "b", "c", "d", nil, :X, :X]
+ *      ['a', 'b', 'c', 'd'].fill('-', 3, 2) # => ["a", "b", "c", "-", "-"]
+ *      ['a', 'b', 'c', 'd'].fill('-', 4, 2) # => ["a", "b", "c", "d", "-", "-"]
  *
- *  If +length+ is zero or negative, replaces no elements:
+ *      ['a', 'b', 'c', 'd'].fill(3, 2) {|e| e.to_s } # => ["a", "b", "c", "3", "4"]
+ *      ['a', 'b', 'c', 'd'].fill(4, 2) {|e| e.to_s } # => ["a", "b", "c", "d", "4", "5"]
  *
- *    a = ['a', 'b', 'c', 'd']
- *    a.fill(:X, 1, 0) # => ["a", "b", "c", "d"]
- *    a.fill(:X, 1, -1) # => ["a", "b", "c", "d"]
+ *    Fills with +nil+ if necessary:
  *
- *  With arguments +obj+ and \Range +range+, and no block given,
- *  replaces elements based on the given range.
+ *      ['a', 'b', 'c', 'd'].fill('-', 5, 2) # => ["a", "b", "c", "d", nil, "-", "-"]
+ *      ['a', 'b', 'c', 'd'].fill('-', 6, 2) # => ["a", "b", "c", "d", nil, nil, "-", "-"]
  *
- *  If the range is positive and ascending (<tt>0 < range.begin <= range.end</tt>),
- *  replaces elements from <tt>range.begin</tt> to <tt>range.end</tt>:
+ *      ['a', 'b', 'c', 'd'].fill(5, 2) {|e| e.to_s } # => ["a", "b", "c", "d", nil, "5", "6"]
+ *      ['a', 'b', 'c', 'd'].fill(6, 2) {|e| e.to_s } # => ["a", "b", "c", "d", nil, nil, "6", "7"]
  *
- *    a = ['a', 'b', 'c', 'd']
- *    a.fill(:X, (1..1)) # => ["a", :X, "c", "d"]
+ *    Does nothing if +count+ is non-positive:
  *
- *  If <tt>range.first</tt> is negative, replaces no elements:
+ *      ['a', 'b', 'c', 'd'].fill('-', 2, 0)    # => ["a", "b", "c", "d"]
+ *      ['a', 'b', 'c', 'd'].fill('-', 2, -100) # => ["a", "b", "c", "d"]
+ *      ['a', 'b', 'c', 'd'].fill('-', 6, -100) # => ["a", "b", "c", "d"]
  *
- *    a = ['a', 'b', 'c', 'd']
- *    a.fill(:X, (-1..1)) # => ["a", "b", "c", "d"]
+ *      ['a', 'b', 'c', 'd'].fill(2, 0) {|e| fail 'Cannot happen' }    # => ["a", "b", "c", "d"]
+ *      ['a', 'b', 'c', 'd'].fill(2, -100) {|e| fail 'Cannot happen' } # => ["a", "b", "c", "d"]
+ *      ['a', 'b', 'c', 'd'].fill(6, -100) {|e| fail 'Cannot happen' } # => ["a", "b", "c", "d"]
  *
- *  If <tt>range.last</tt> is negative, counts from the end:
+ *  - If +start+ is negative, counts backwards from the end of +self+:
  *
- *    a = ['a', 'b', 'c', 'd']
- *    a.fill(:X, (0..-2)) # => [:X, :X, :X, "d"]
- *    a = ['a', 'b', 'c', 'd']
- *    a.fill(:X, (1..-2)) # => ["a", :X, :X, "d"]
+ *      ['a', 'b', 'c', 'd'].fill('-', -4, 3) # => ["-", "-", "-", "d"]
+ *      ['a', 'b', 'c', 'd'].fill('-', -3, 3) # => ["a", "-", "-", "-"]
  *
- *  If <tt>range.last</tt> and <tt>range.last</tt> are both negative,
- *  both count from the end of the array:
+ *      ['a', 'b', 'c', 'd'].fill(-4, 3) {|e| e.to_s } # => ["0", "1", "2", "d"]
+ *      ['a', 'b', 'c', 'd'].fill(-3, 3) {|e| e.to_s } # => ["a", "1", "2", "3"]
  *
- *    a = ['a', 'b', 'c', 'd']
- *    a.fill(:X, (-1..-1)) # => ["a", "b", "c", :X]
- *    a = ['a', 'b', 'c', 'd']
- *    a.fill(:X, (-2..-2)) # => ["a", "b", :X, "d"]
+ *    Extends +self+ if necessary:
  *
- *  With no arguments and a block given, calls the block with each index;
- *  replaces the corresponding element with the block's return value:
- *
- *    a = ['a', 'b', 'c', 'd']
- *    a.fill { |index| "new_#{index}" } # => ["new_0", "new_1", "new_2", "new_3"]
+ *      ['a', 'b', 'c', 'd'].fill('-', -2, 3) # => ["a", "b", "-", "-", "-"]
+ *      ['a', 'b', 'c', 'd'].fill('-', -1, 3) # => ["a", "b", "c", "-", "-", "-"]
  *
- *  With argument +start+ and a block given, calls the block with each index
- *  from offset +start+ to the end; replaces the corresponding element
- *  with the block's return value.
+ *      ['a', 'b', 'c', 'd'].fill(-2, 3) {|e| e.to_s } # => ["a", "b", "2", "3", "4"]
+ *      ['a', 'b', 'c', 'd'].fill(-1, 3) {|e| e.to_s } # => ["a", "b", "c", "3", "4", "5"]
  *
- *  If start is in range (<tt>0 <= start < array.size</tt>),
- *  replaces from offset +start+ to the end:
+ *    Starts at the beginning of +self+ if +start+ is negative and out-of-range:
  *
- *    a = ['a', 'b', 'c', 'd']
- *    a.fill(1) { |index| "new_#{index}" } # => ["a", "new_1", "new_2", "new_3"]
+ *      ['a', 'b', 'c', 'd'].fill('-', -5, 2) # => ["-", "-", "c", "d"]
+ *      ['a', 'b', 'c', 'd'].fill('-', -6, 2) # => ["-", "-", "c", "d"]
  *
- *  If +start+ is too large(<tt>start >= array.size</tt>), does nothing:
+ *      ['a', 'b', 'c', 'd'].fill(-5, 2) {|e| e.to_s } # => ["0", "1", "c", "d"]
+ *      ['a', 'b', 'c', 'd'].fill(-6, 2) {|e| e.to_s } # => ["0", "1", "c", "d"]
  *
- *    a = ['a', 'b', 'c', 'd']
- *    a.fill(4) { |index| fail 'Cannot happen' } # => ["a", "b", "c", "d"]
- *    a = ['a', 'b', 'c', 'd']
- *    a.fill(4) { |index| fail 'Cannot happen' } # => ["a", "b", "c", "d"]
+ *    Does nothing if +count+ is non-positive:
  *
- *  If +start+ is negative, counts from the end:
+ *      ['a', 'b', 'c', 'd'].fill('-', -2, 0)  # => ["a", "b", "c", "d"]
+ *      ['a', 'b', 'c', 'd'].fill('-', -2, -1) # => ["a", "b", "c", "d"]
  *
- *    a = ['a', 'b', 'c', 'd']
- *    a.fill(-2) { |index| "new_#{index}" } # => ["a", "b", "new_2", "new_3"]
+ *      ['a', 'b', 'c', 'd'].fill(-2, 0) {|e| fail 'Cannot happen' }  # => ["a", "b", "c", "d"]
+ *      ['a', 'b', 'c', 'd'].fill(-2, -1) {|e| fail 'Cannot happen' } # => ["a", "b", "c", "d"]
  *
- *  If start is too small (<tt>start <= -array.size</tt>, replaces all elements:
+ *  When argument +range+ is given,
+ *  it must be a Range object whose members are numeric;
+ *  its +begin+ and +end+ values determine the elements of +self+
+ *  to be replaced:
  *
- *    a = ['a', 'b', 'c', 'd']
- *    a.fill(-6) { |index| "new_#{index}" } # => ["new_0", "new_1", "new_2", "new_3"]
- *    a = ['a', 'b', 'c', 'd']
- *    a.fill(-50) { |index| "new_#{index}" } # => ["new_0", "new_1", "new_2", "new_3"]
+ *  - If both +begin+ and +end+ are positive, they specify the first and last elements
+ *    to be replaced:
  *
- *  With arguments +start+ and +length+, and a block given,
- *  calls the block for each index specified by start length;
- *  replaces the corresponding element with the block's return value.
+ *      ['a', 'b', 'c', 'd'].fill('-', 1..2)          # => ["a", "-", "-", "d"]
+ *      ['a', 'b', 'c', 'd'].fill(1..2) {|e| e.to_s } # => ["a", "1", "2", "d"]
  *
- *  If +start+ is in range, replaces +length+ elements beginning at offset +start+:
+ *    If +end+ is smaller than +begin+, replaces no elements:
  *
- *    a = ['a', 'b', 'c', 'd']
- *    a.fill(1, 1) { |index| "new_#{index}" } # => ["a", "new_1", "c", "d"]
+ *      ['a', 'b', 'c', 'd'].fill('-', 2..1)          # => ["a", "b", "c", "d"]
+ *      ['a', 'b', 'c', 'd'].fill(2..1) {|e| e.to_s } # => ["a", "b", "c", "d"]
  *
- *  If start is negative, counts from the end:
+ *  - If either is negative (or both are negative), counts backwards from the end of +self+:
  *
- *    a = ['a', 'b', 'c', 'd']
- *    a.fill(-2, 1) { |index| "new_#{index}" } # => ["a", "b", "new_2", "d"]
+ *      ['a', 'b', 'c', 'd'].fill('-', -3..2)  # => ["a", "-", "-", "d"]
+ *      ['a', 'b', 'c', 'd'].fill('-', 1..-2)  # => ["a", "-", "-", "d"]
+ *      ['a', 'b', 'c', 'd'].fill('-', -3..-2) # => ["a", "-", "-", "d"]
  *
- *  If +start+ is large (<tt>start >= array.size</tt>), extends +self+ with +nil+:
+ *      ['a', 'b', 'c', 'd'].fill(-3..2) {|e| e.to_s }  # => ["a", "1", "2", "d"]
+ *      ['a', 'b', 'c', 'd'].fill(1..-2) {|e| e.to_s }  # => ["a", "1", "2", "d"]
+ *      ['a', 'b', 'c', 'd'].fill(-3..-2) {|e| e.to_s } # => ["a", "1", "2", "d"]
  *
- *    a = ['a', 'b', 'c', 'd']
- *    a.fill(5, 0) { |index| "new_#{index}" } # => ["a", "b", "c", "d", nil]
- *    a = ['a', 'b', 'c', 'd']
- *    a.fill(5, 2) { |index| "new_#{index}" } # => ["a", "b", "c", "d", nil, "new_5", "new_6"]
+ *  - If the +end+ value is excluded (see Range#exclude_end?), omits the last replacement:
  *
- *  If +length+ is zero or less, replaces no elements:
+ *      ['a', 'b', 'c', 'd'].fill('-', 1...2)  # => ["a", "-", "c", "d"]
+ *      ['a', 'b', 'c', 'd'].fill('-', 1...-2) # => ["a", "-", "c", "d"]
  *
- *    a = ['a', 'b', 'c', 'd']
- *    a.fill(1, 0) { |index| "new_#{index}" } # => ["a", "b", "c", "d"]
- *    a.fill(1, -1) { |index| "new_#{index}" } # => ["a", "b", "c", "d"]
+ *      ['a', 'b', 'c', 'd'].fill(1...2) {|e| e.to_s }  # => ["a", "1", "c", "d"]
+ *      ['a', 'b', 'c', 'd'].fill(1...-2) {|e| e.to_s } # => ["a", "1", "c", "d"]
  *
- *  With arguments +obj+ and +range+, and a block given,
- *  calls the block with each index in the given range;
- *  replaces the corresponding element with the block's return value.
+ *  - If the range is endless (see {Endless Ranges}[rdoc-ref:Range@Endless+Ranges]),
+ *    replaces elements to the end of +self+:
  *
- *  If the range is positive and ascending (<tt>range 0 < range.begin <= range.end</tt>,
- *  replaces elements from <tt>range.begin</tt> to <tt>range.end</tt>:
+ *      ['a', 'b', 'c', 'd'].fill('-', 1..)          # => ["a", "-", "-", "-"]
+ *      ['a', 'b', 'c', 'd'].fill(1..) {|e| e.to_s } # => ["a", "1", "2", "3"]
  *
- *    a = ['a', 'b', 'c', 'd']
- *    a.fill(1..1) { |index| "new_#{index}" } # => ["a", "new_1", "c", "d"]
+ *  - If the range is beginless (see {Beginless Ranges}[rdoc-ref:Range@Beginless+Ranges]),
+ *    replaces elements from the beginning of +self+:
  *
- *  If +range.first+ is negative, does nothing:
- *
- *    a = ['a', 'b', 'c', 'd']
- *    a.fill(-1..1) { |index| fail 'Cannot happen' } # => ["a", "b", "c", "d"]
- *
- *  If <tt>range.last</tt> is negative, counts from the end:
- *
- *    a = ['a', 'b', 'c', 'd']
- *    a.fill(0..-2) { |index| "new_#{index}" } # => ["new_0", "new_1", "new_2", "d"]
- *    a = ['a', 'b', 'c', 'd']
- *    a.fill(1..-2) { |index| "new_#{index}" } # => ["a", "new_1", "new_2", "d"]
- *
- *  If <tt>range.first</tt> and <tt>range.last</tt> are both negative,
- *  both count from the end:
- *
- *    a = ['a', 'b', 'c', 'd']
- *    a.fill(-1..-1) { |index| "new_#{index}" } # => ["a", "b", "c", "new_3"]
- *    a = ['a', 'b', 'c', 'd']
- *    a.fill(-2..-2) { |index| "new_#{index}" } # => ["a", "b", "new_2", "d"]
+ *      ['a', 'b', 'c', 'd'].fill('-', ..2)          # => ["-", "-", "-", "d"]
+ *      ['a', 'b', 'c', 'd'].fill(..2) {|e| e.to_s } # => ["0", "1", "2", "d"]
  *
+ *  Related: see {Methods for Assigning}[rdoc-ref:Array@Methods+for+Assigning].
  */
 
 static VALUE
@@ -4940,74 +5051,74 @@ rb_ary_fill(int argc, VALUE *argv, VALUE ary)
     long beg = 0, end = 0, len = 0;
 
     if (rb_block_given_p()) {
-	rb_scan_args(argc, argv, "02", &arg1, &arg2);
-	argc += 1;		/* hackish */
+        rb_scan_args(argc, argv, "02", &arg1, &arg2);
+        argc += 1;		/* hackish */
     }
     else {
-	rb_scan_args(argc, argv, "12", &item, &arg1, &arg2);
+        rb_scan_args(argc, argv, "12", &item, &arg1, &arg2);
     }
     switch (argc) {
       case 1:
-	beg = 0;
-	len = RARRAY_LEN(ary);
-	break;
+        beg = 0;
+        len = RARRAY_LEN(ary);
+        break;
       case 2:
-	if (rb_range_beg_len(arg1, &beg, &len, RARRAY_LEN(ary), 1)) {
-	    break;
-	}
-	/* fall through */
+        if (rb_range_beg_len(arg1, &beg, &len, RARRAY_LEN(ary), 1)) {
+            break;
+        }
+        /* fall through */
       case 3:
-	beg = NIL_P(arg1) ? 0 : NUM2LONG(arg1);
-	if (beg < 0) {
-	    beg = RARRAY_LEN(ary) + beg;
-	    if (beg < 0) beg = 0;
-	}
-	len = NIL_P(arg2) ? RARRAY_LEN(ary) - beg : NUM2LONG(arg2);
-	break;
+        beg = NIL_P(arg1) ? 0 : NUM2LONG(arg1);
+        if (beg < 0) {
+            beg = RARRAY_LEN(ary) + beg;
+            if (beg < 0) beg = 0;
+        }
+        len = NIL_P(arg2) ? RARRAY_LEN(ary) - beg : NUM2LONG(arg2);
+        break;
     }
     rb_ary_modify(ary);
     if (len < 0) {
         return ary;
     }
     if (beg >= ARY_MAX_SIZE || len > ARY_MAX_SIZE - beg) {
-	rb_raise(rb_eArgError, "argument too big");
+        rb_raise(rb_eArgError, "argument too big");
     }
     end = beg + len;
     if (RARRAY_LEN(ary) < end) {
-	if (end >= ARY_CAPA(ary)) {
-	    ary_resize_capa(ary, end);
-	}
-	ary_mem_clear(ary, RARRAY_LEN(ary), end - RARRAY_LEN(ary));
-	ARY_SET_LEN(ary, end);
+        if (end >= ARY_CAPA(ary)) {
+            ary_resize_capa(ary, end);
+        }
+        ary_mem_clear(ary, RARRAY_LEN(ary), end - RARRAY_LEN(ary));
+        ARY_SET_LEN(ary, end);
     }
 
-    if (item == Qundef) {
-	VALUE v;
-	long i;
+    if (UNDEF_P(item)) {
+        VALUE v;
+        long i;
 
-	for (i=beg; i<end; i++) {
-	    v = rb_yield(LONG2NUM(i));
-	    if (i>=RARRAY_LEN(ary)) break;
-	    ARY_SET(ary, i, v);
-	}
+        for (i=beg; i<end; i++) {
+            v = rb_yield(LONG2NUM(i));
+            if (i>=RARRAY_LEN(ary)) break;
+            ARY_SET(ary, i, v);
+        }
     }
     else {
-	ary_memfill(ary, beg, len, item);
+        ary_memfill(ary, beg, len, item);
     }
     return ary;
 }
 
 /*
  *  call-seq:
- *    array + other_array -> new_array
+ *    self + other_array -> new_array
  *
- *  Returns a new \Array containing all elements of +array+
+ *  Returns a new array containing all elements of +self+
  *  followed by all elements of +other_array+:
  *
  *    a = [0, 1] + [2, 3]
  *    a # => [0, 1, 2, 3]
  *
- *  Related: #concat.
+ *  Related: see {Methods for Combining}[rdoc-ref:Array@Methods+for+Combining].
  */
 
 VALUE
@@ -5022,8 +5133,8 @@ rb_ary_plus(VALUE x, VALUE y)
     len = xlen + ylen;
     z = rb_ary_new2(len);
 
-    ary_memcpy(z, 0, xlen, RARRAY_CONST_PTR_TRANSIENT(x));
-    ary_memcpy(z, xlen, ylen, RARRAY_CONST_PTR_TRANSIENT(y));
+    ary_memcpy(z, 0, xlen, RARRAY_CONST_PTR(x));
+    ary_memcpy(z, xlen, ylen, RARRAY_CONST_PTR(y));
     ARY_SET_LEN(z, len);
     return z;
 }
@@ -5033,7 +5144,7 @@ ary_append(VALUE x, VALUE y)
 {
     long n = RARRAY_LEN(y);
     if (n > 0) {
-        rb_ary_splice(x, RARRAY_LEN(x), 0, RARRAY_CONST_PTR_TRANSIENT(y), n);
+        rb_ary_splice(x, RARRAY_LEN(x), 0, RARRAY_CONST_PTR(y), n);
     }
     RB_GC_GUARD(y);
     return x;
@@ -5041,12 +5152,15 @@ ary_append(VALUE x, VALUE y)
 
 /*
  *  call-seq:
- *    array.concat(*other_arrays) -> self
+ *    concat(*other_arrays) -> self
  *
- *  Adds to +array+ all elements from each \Array in +other_arrays+; returns +self+:
+ *  Adds to +self+ all elements from each array in +other_arrays+; returns +self+:
  *
  *    a = [0, 1]
- *    a.concat([2, 3], [4, 5]) # => [0, 1, 2, 3, 4, 5]
+ *    a.concat(['two', 'three'], [:four, :five], a)
+ *    # => [0, 1, "two", "three", :four, :five, 0, 1]
+ *
+ *  Related: see {Methods for Assigning}[rdoc-ref:Array@Methods+for+Assigning].
  */
 
 static VALUE
@@ -5055,15 +5169,15 @@ rb_ary_concat_multi(int argc, VALUE *argv, VALUE ary)
     rb_ary_modify_check(ary);
 
     if (argc == 1) {
-	rb_ary_concat(ary, argv[0]);
+        rb_ary_concat(ary, argv[0]);
     }
     else if (argc > 1) {
-	int i;
-	VALUE args = rb_ary_tmp_new(argc);
-	for (i = 0; i < argc; i++) {
-	    rb_ary_concat(args, argv[i]);
-	}
-	ary_append(ary, args);
+        int i;
+        VALUE args = rb_ary_hidden_new(argc);
+        for (i = 0; i < argc; i++) {
+            rb_ary_concat(args, argv[i]);
+        }
+        ary_append(ary, args);
     }
 
     ary_verify(ary);
@@ -5078,19 +5192,19 @@ rb_ary_concat(VALUE x, VALUE y)
 
 /*
  *  call-seq:
- *    array * n -> new_array
- *    array * string_separator -> new_string
+ *    self * n -> new_array
+ *    self * string_separator -> new_string
  *
- *  When non-negative argument \Integer +n+ is given,
- *  returns a new \Array built by concatenating the +n+ copies of +self+:
+ *  When non-negative integer argument +n+ is given,
+ *  returns a new array built by concatenating +n+ copies of +self+:
  *
  *    a = ['x', 'y']
  *    a * 3 # => ["x", "y", "x", "y", "x", "y"]
  *
- *  When \String argument +string_separator+ is given,
- *  equivalent to <tt>array.join(string_separator)</tt>:
+ *  When string argument +string_separator+ is given,
+ *  equivalent to <tt>self.join(string_separator)</tt>:
  *
- *    [0, [0, 1], {foo: 0}] * ', ' # => "0, 0, 1, {:foo=>0}"
+ *    [0, [0, 1], {foo: 0}] * ', ' # => "0, 0, 1, {foo: 0}"
  *
  */
 
@@ -5103,35 +5217,35 @@ rb_ary_times(VALUE ary, VALUE times)
 
     tmp = rb_check_string_type(times);
     if (!NIL_P(tmp)) {
-	return rb_ary_join(ary, tmp);
+        return rb_ary_join(ary, tmp);
     }
 
     len = NUM2LONG(times);
     if (len == 0) {
         ary2 = ary_new(rb_cArray, 0);
-	goto out;
+        goto out;
     }
     if (len < 0) {
-	rb_raise(rb_eArgError, "negative argument");
+        rb_raise(rb_eArgError, "negative argument");
     }
     if (ARY_MAX_SIZE/len < RARRAY_LEN(ary)) {
-	rb_raise(rb_eArgError, "argument too big");
+        rb_raise(rb_eArgError, "argument too big");
     }
     len *= RARRAY_LEN(ary);
 
     ary2 = ary_new(rb_cArray, len);
     ARY_SET_LEN(ary2, len);
 
-    ptr = RARRAY_CONST_PTR_TRANSIENT(ary);
+    ptr = RARRAY_CONST_PTR(ary);
     t = RARRAY_LEN(ary);
     if (0 < t) {
-	ary_memcpy(ary2, 0, t, ptr);
-	while (t <= len/2) {
-            ary_memcpy(ary2, t, t, RARRAY_CONST_PTR_TRANSIENT(ary2));
+        ary_memcpy(ary2, 0, t, ptr);
+        while (t <= len/2) {
+            ary_memcpy(ary2, t, t, RARRAY_CONST_PTR(ary2));
             t *= 2;
         }
         if (t < len) {
-            ary_memcpy(ary2, t, len-t, RARRAY_CONST_PTR_TRANSIENT(ary2));
+            ary_memcpy(ary2, t, len-t, RARRAY_CONST_PTR(ary2));
         }
     }
   out:
@@ -5140,17 +5254,18 @@ rb_ary_times(VALUE ary, VALUE times)
 
 /*
  *  call-seq:
- *    array.assoc(obj) -> found_array or nil
+ *    assoc(object) -> found_array or nil
  *
- *  Returns the first element in +self+ that is an \Array
- *  whose first element <tt>==</tt> +obj+:
+ *  Returns the first element +ele+ in +self+ such that +ele+ is an array
+ *  and <tt>ele[0] == object</tt>:
  *
  *    a = [{foo: 0}, [2, 4], [4, 5, 6], [4, 5]]
  *    a.assoc(4) # => [4, 5, 6]
  *
  *  Returns +nil+ if no such element is found.
  *
- *  Related: #rassoc.
+ *  Related: Array#rassoc;
+ *  see also {Methods for Fetching}[rdoc-ref:Array@Methods+for+Fetching].
  */
 
 VALUE
@@ -5160,27 +5275,29 @@ rb_ary_assoc(VALUE ary, VALUE key)
     VALUE v;
 
     for (i = 0; i < RARRAY_LEN(ary); ++i) {
-	v = rb_check_array_type(RARRAY_AREF(ary, i));
-	if (!NIL_P(v) && RARRAY_LEN(v) > 0 &&
-	    rb_equal(RARRAY_AREF(v, 0), key))
-	    return v;
+        v = rb_check_array_type(RARRAY_AREF(ary, i));
+        if (!NIL_P(v) && RARRAY_LEN(v) > 0 &&
+            rb_equal(RARRAY_AREF(v, 0), key))
+            return v;
     }
     return Qnil;
 }
 
 /*
  *  call-seq:
- *    array.rassoc(obj) -> found_array or nil
+ *    rassoc(object) -> found_array or nil
  *
- *  Returns the first element in +self+ that is an \Array
- *  whose second element <tt>==</tt> +obj+:
+ *  Returns the first element +ele+ in +self+ such that +ele+ is an array
+ *  and <tt>ele[1] == object</tt>:
  *
  *    a = [{foo: 0}, [2, 4], [4, 5, 6], [4, 5]]
  *    a.rassoc(4) # => [2, 4]
+ *    a.rassoc(5) # => [4, 5, 6]
  *
  *  Returns +nil+ if no such element is found.
  *
- *  Related: #assoc.
+ *  Related: Array#assoc;
+ *  see also {Methods for Fetching}[rdoc-ref:Array@Methods+for+Fetching].
  */
 
 VALUE
@@ -5190,11 +5307,11 @@ rb_ary_rassoc(VALUE ary, VALUE value)
     VALUE v;
 
     for (i = 0; i < RARRAY_LEN(ary); ++i) {
-	v = RARRAY_AREF(ary, i);
-	if (RB_TYPE_P(v, T_ARRAY) &&
-	    RARRAY_LEN(v) > 1 &&
-	    rb_equal(RARRAY_AREF(v, 1), value))
-	    return v;
+        v = rb_check_array_type(RARRAY_AREF(ary, i));
+        if (RB_TYPE_P(v, T_ARRAY) &&
+            RARRAY_LEN(v) > 1 &&
+            rb_equal(RARRAY_AREF(v, 1), value))
+            return v;
     }
     return Qnil;
 }
@@ -5213,42 +5330,48 @@ recursive_equal(VALUE ary1, VALUE ary2, int recur)
     len1 = RARRAY_LEN(ary1);
 
     for (i = 0; i < len1; i++) {
-	if (*p1 != *p2) {
-	    if (rb_equal(*p1, *p2)) {
-		len1 = RARRAY_LEN(ary1);
-		if (len1 != RARRAY_LEN(ary2))
-		    return Qfalse;
-		if (len1 < i)
-		    return Qtrue;
+        if (*p1 != *p2) {
+            if (rb_equal(*p1, *p2)) {
+                len1 = RARRAY_LEN(ary1);
+                if (len1 != RARRAY_LEN(ary2))
+                    return Qfalse;
+                if (len1 < i)
+                    return Qtrue;
                 p1 = RARRAY_CONST_PTR(ary1) + i;
                 p2 = RARRAY_CONST_PTR(ary2) + i;
-	    }
-	    else {
-		return Qfalse;
-	    }
-	}
-	p1++;
-	p2++;
+            }
+            else {
+                return Qfalse;
+            }
+        }
+        p1++;
+        p2++;
     }
     return Qtrue;
 }
 
 /*
  *  call-seq:
- *    array == other_array -> true or false
+ *    self == other_array -> true or false
  *
- *  Returns +true+ if both <tt>array.size == other_array.size</tt>
- *  and for each index +i+ in +array+, <tt>array[i] == other_array[i]</tt>:
+ *  Returns whether both:
  *
- *    a0 = [:foo, 'bar', 2]
- *    a1 = [:foo, 'bar', 2.0]
- *    a1 == a0 # => true
- *    [] == [] # => true
+ *  - +self+ and +other_array+ are the same size.
+ *  - Their corresponding elements are the same;
+ *    that is, for each index +i+ in <tt>(0...self.size)</tt>,
+ *    <tt>self[i] == other_array[i]</tt>.
  *
- *  Otherwise, returns +false+.
+ *  Examples:
+ *
+ *    [:foo, 'bar', 2] == [:foo, 'bar', 2]   # => true
+ *    [:foo, 'bar', 2] == [:foo, 'bar', 2.0] # => true
+ *    [:foo, 'bar', 2] == [:foo, 'bar']      # => false # Different sizes.
+ *    [:foo, 'bar', 2] == [:foo, 'bar', 3]   # => false # Different elements.
  *
  *  This method is different from method Array#eql?,
  *  which compares elements using <tt>Object#eql?</tt>.
+ *
+ *  Related: see {Methods for Comparing}[rdoc-ref:Array@Methods+for+Comparing].
  */
 
 static VALUE
@@ -5256,13 +5379,13 @@ rb_ary_equal(VALUE ary1, VALUE ary2)
 {
     if (ary1 == ary2) return Qtrue;
     if (!RB_TYPE_P(ary2, T_ARRAY)) {
-	if (!rb_respond_to(ary2, idTo_ary)) {
-	    return Qfalse;
-	}
-	return rb_equal(ary2, ary1);
+        if (!rb_respond_to(ary2, idTo_ary)) {
+            return Qfalse;
+        }
+        return rb_equal(ary2, ary1);
     }
     if (RARRAY_LEN(ary1) != RARRAY_LEN(ary2)) return Qfalse;
-    if (RARRAY_CONST_PTR_TRANSIENT(ary1) == RARRAY_CONST_PTR_TRANSIENT(ary2)) return Qtrue;
+    if (RARRAY_CONST_PTR(ary1) == RARRAY_CONST_PTR(ary2)) return Qtrue;
     return rb_exec_recursive_paired(recursive_equal, ary1, ary2, ary2);
 }
 
@@ -5273,18 +5396,18 @@ recursive_eql(VALUE ary1, VALUE ary2, int recur)
 
     if (recur) return Qtrue; /* Subtle! */
     for (i=0; i<RARRAY_LEN(ary1); i++) {
-	if (!rb_eql(rb_ary_elt(ary1, i), rb_ary_elt(ary2, i)))
-	    return Qfalse;
+        if (!rb_eql(rb_ary_elt(ary1, i), rb_ary_elt(ary2, i)))
+            return Qfalse;
     }
     return Qtrue;
 }
 
 /*
  *  call-seq:
- *    array.eql? other_array -> true or false
+ *    eql?(other_array) -> true or false
  *
  *  Returns +true+ if +self+ and +other_array+ are the same size,
- *  and if, for each index +i+ in +self+, <tt>self[i].eql? other_array[i]</tt>:
+ *  and if, for each index +i+ in +self+, <tt>self[i].eql?(other_array[i])</tt>:
  *
  *    a0 = [:foo, 'bar', 2]
  *    a1 = [:foo, 'bar', 2]
@@ -5294,6 +5417,8 @@ recursive_eql(VALUE ary1, VALUE ary2, int recur)
  *
  *  This method is different from method Array#==,
  *  which compares using method <tt>Object#==</tt>.
+ *
+ *  Related: see {Methods for Querying}[rdoc-ref:Array@Methods+for+Querying].
  */
 
 static VALUE
@@ -5302,49 +5427,71 @@ rb_ary_eql(VALUE ary1, VALUE ary2)
     if (ary1 == ary2) return Qtrue;
     if (!RB_TYPE_P(ary2, T_ARRAY)) return Qfalse;
     if (RARRAY_LEN(ary1) != RARRAY_LEN(ary2)) return Qfalse;
-    if (RARRAY_CONST_PTR_TRANSIENT(ary1) == RARRAY_CONST_PTR_TRANSIENT(ary2)) return Qtrue;
+    if (RARRAY_CONST_PTR(ary1) == RARRAY_CONST_PTR(ary2)) return Qtrue;
     return rb_exec_recursive_paired(recursive_eql, ary1, ary2, ary2);
 }
 
+static VALUE
+ary_hash_values(long len, const VALUE *elements, const VALUE ary)
+{
+    long i;
+    st_index_t h;
+    VALUE n;
+
+    h = rb_hash_start(len);
+    h = rb_hash_uint(h, (st_index_t)rb_ary_hash_values);
+    for (i=0; i<len; i++) {
+        n = rb_hash(elements[i]);
+        h = rb_hash_uint(h, NUM2LONG(n));
+        if (ary) {
+            len = RARRAY_LEN(ary);
+            elements = RARRAY_CONST_PTR(ary);
+        }
+    }
+    h = rb_hash_end(h);
+    return ST2FIX(h);
+}
+
+VALUE
+rb_ary_hash_values(long len, const VALUE *elements)
+{
+    return ary_hash_values(len, elements, 0);
+}
+
 /*
  *  call-seq:
- *    array.hash -> integer
+ *    hash -> integer
  *
  *  Returns the integer hash value for +self+.
  *
- *  Two arrays with the same content will have the same hash code (and will compare using eql?):
+ *  Two arrays with the same content will have the same hash value
+ *  (and will compare using eql?):
  *
- *    [0, 1, 2].hash == [0, 1, 2].hash # => true
- *    [0, 1, 2].hash == [0, 1, 3].hash # => false
+ *    ['a', 'b'].hash == ['a', 'b'].hash # => true
+ *    ['a', 'b'].hash == ['a', 'c'].hash # => false
+ *    ['a', 'b'].hash == ['a'].hash      # => false
  *
  */
 
 static VALUE
 rb_ary_hash(VALUE ary)
 {
-    long i;
-    st_index_t h;
-    VALUE n;
-
-    h = rb_hash_start(RARRAY_LEN(ary));
-    h = rb_hash_uint(h, (st_index_t)rb_ary_hash);
-    for (i=0; i<RARRAY_LEN(ary); i++) {
-	n = rb_hash(RARRAY_AREF(ary, i));
-	h = rb_hash_uint(h, NUM2LONG(n));
-    }
-    h = rb_hash_end(h);
-    return ST2FIX(h);
+    RBIMPL_ASSERT_OR_ASSUME(ary);
+    return ary_hash_values(RARRAY_LEN(ary), RARRAY_CONST_PTR(ary), ary);
 }
 
 /*
  *  call-seq:
- *    array.include?(obj) -> true or false
+ *    include?(object) -> true or false
  *
- *  Returns +true+ if for some index +i+ in +self+, <tt>obj == self[i]</tt>;
- *  otherwise +false+:
+ *  Returns whether for some element +element+ in +self+,
+ *  <tt>object == element</tt>:
  *
- *    [0, 1, 2].include?(2) # => true
- *    [0, 1, 2].include?(3) # => false
+ *    [0, 1, 2].include?(2)   # => true
+ *    [0, 1, 2].include?(2.0) # => true
+ *    [0, 1, 2].include?(2.1) # => false
+ *
+ *  Related: see {Methods for Querying}[rdoc-ref:Array@Methods+for+Querying].
  */
 
 VALUE
@@ -5354,10 +5501,10 @@ rb_ary_includes(VALUE ary, VALUE item)
     VALUE e;
 
     for (i=0; i<RARRAY_LEN(ary); i++) {
-	e = RARRAY_AREF(ary, i);
-	if (rb_equal(e, item)) {
-	    return Qtrue;
-	}
+        e = RARRAY_AREF(ary, i);
+        if (rb_equal(e, item)) {
+            return Qtrue;
+        }
     }
     return Qfalse;
 }
@@ -5369,10 +5516,10 @@ rb_ary_includes_by_eql(VALUE ary, VALUE item)
     VALUE e;
 
     for (i=0; i<RARRAY_LEN(ary); i++) {
-	e = RARRAY_AREF(ary, i);
-	if (rb_eql(item, e)) {
-	    return Qtrue;
-	}
+        e = RARRAY_AREF(ary, i);
+        if (rb_eql(item, e)) {
+            return Qtrue;
+        }
     }
     return Qfalse;
 }
@@ -5385,47 +5532,54 @@ recursive_cmp(VALUE ary1, VALUE ary2, int recur)
     if (recur) return Qundef;	/* Subtle! */
     len = RARRAY_LEN(ary1);
     if (len > RARRAY_LEN(ary2)) {
-	len = RARRAY_LEN(ary2);
+        len = RARRAY_LEN(ary2);
     }
     for (i=0; i<len; i++) {
-	VALUE e1 = rb_ary_elt(ary1, i), e2 = rb_ary_elt(ary2, i);
-	VALUE v = rb_funcallv(e1, id_cmp, 1, &e2);
-	if (v != INT2FIX(0)) {
-	    return v;
-	}
+        VALUE e1 = rb_ary_elt(ary1, i), e2 = rb_ary_elt(ary2, i);
+        VALUE v = rb_funcallv(e1, id_cmp, 1, &e2);
+        if (v != INT2FIX(0)) {
+            return v;
+        }
     }
     return Qundef;
 }
 
 /*
  *  call-seq:
- *    array <=> other_array -> -1, 0, or 1
+ *    self <=> other_array -> -1, 0, or 1
  *
- *  Returns -1, 0, or 1 as +self+ is less than, equal to, or greater than +other_array+.
- *  For each index +i+ in +self+, evaluates <tt>result = self[i] <=> other_array[i]</tt>.
+ *  Returns -1, 0, or 1 as +self+ is determined
+ *  to be less than, equal to, or greater than +other_array+.
  *
- *  Returns -1 if any result is -1:
+ *  Iterates over each index +i+ in <tt>(0...self.size)</tt>:
  *
- *    [0, 1, 2] <=> [0, 1, 3] # => -1
+ *  - Computes <tt>result[i]</tt> as <tt>self[i] <=> other_array[i]</tt>.
+ *  - Immediately returns 1 if <tt>result[i]</tt> is 1:
  *
- *  Returns 1 if any result is 1:
+ *      [0, 1, 2] <=> [0, 0, 2] # => 1
  *
- *    [0, 1, 2] <=> [0, 1, 1] # => 1
+ *  - Immediately returns -1 if <tt>result[i]</tt> is -1:
  *
- *  When all results are zero:
+ *      [0, 1, 2] <=> [0, 2, 2] # => -1
  *
- *  - Returns -1 if +array+ is smaller than +other_array+:
+ *  - Continues if <tt>result[i]</tt> is 0.
  *
- *      [0, 1, 2] <=> [0, 1, 2, 3] # => -1
+ *  When every +result+ is 0,
+ *  returns <tt>self.size <=> other_array.size</tt>
+ *  (see Integer#<=>):
  *
- *  - Returns 1 if +array+ is larger than +other_array+:
+ *    [0, 1, 2] <=> [0, 1]        # => 1
+ *    [0, 1, 2] <=> [0, 1, 2]     # => 0
+ *    [0, 1, 2] <=> [0, 1, 2, 3]  # => -1
  *
- *      [0, 1, 2] <=> [0, 1] # => 1
+ *  Note that when +other_array+ is larger than +self+,
+ *  its trailing elements do not affect the result:
  *
- *  - Returns 0 if +array+ and +other_array+ are the same size:
- *
- *      [0, 1, 2] <=> [0, 1, 2] # => 0
+ *    [0, 1, 2] <=> [0, 1, 2, -3] # => -1
+ *    [0, 1, 2] <=> [0, 1, 2, 0]  # => -1
+ *    [0, 1, 2] <=> [0, 1, 2, 3]  # => -1
  *
+ *  Related: see {Methods for Comparing}[rdoc-ref:Array@Methods+for+Comparing].
  */
 
 VALUE
@@ -5438,7 +5592,7 @@ rb_ary_cmp(VALUE ary1, VALUE ary2)
     if (NIL_P(ary2)) return Qnil;
     if (ary1 == ary2) return INT2FIX(0);
     v = rb_exec_recursive_paired(recursive_cmp, ary1, ary2, ary2);
-    if (v != Qundef) return v;
+    if (!UNDEF_P(v)) return v;
     len = RARRAY_LEN(ary1) - RARRAY_LEN(ary2);
     if (len == 0) return INT2FIX(0);
     if (len > 0) return INT2FIX(1);
@@ -5451,8 +5605,8 @@ ary_add_hash(VALUE hash, VALUE ary)
     long i;
 
     for (i=0; i<RARRAY_LEN(ary); i++) {
-	VALUE elt = RARRAY_AREF(ary, i);
-	rb_hash_add_new_element(hash, elt, elt);
+        VALUE elt = RARRAY_AREF(ary, i);
+        rb_hash_add_new_element(hash, elt, elt);
     }
     return hash;
 }
@@ -5480,8 +5634,8 @@ ary_add_hash_by(VALUE hash, VALUE ary)
     long i;
 
     for (i = 0; i < RARRAY_LEN(ary); ++i) {
-	VALUE v = rb_ary_elt(ary, i), k = rb_yield(v);
-	rb_hash_add_new_element(hash, k, v);
+        VALUE v = rb_ary_elt(ary, i), k = rb_yield(v);
+        rb_hash_add_new_element(hash, k, v);
     }
     return hash;
 }
@@ -5493,34 +5647,25 @@ ary_make_hash_by(VALUE ary)
     return ary_add_hash_by(hash, ary);
 }
 
-static inline void
-ary_recycle_hash(VALUE hash)
-{
-    assert(RBASIC_CLASS(hash) == 0);
-    if (RHASH_ST_TABLE_P(hash)) {
-        st_table *tbl = RHASH_ST_TABLE(hash);
-	st_free_table(tbl);
-        RHASH_ST_CLEAR(hash);
-    }
-}
-
 /*
  *  call-seq:
- *    array - other_array -> new_array
+ *    self - other_array -> new_array
  *
- *  Returns a new \Array containing only those elements from +array+
- *  that are not found in \Array +other_array+;
- *  items are compared using <tt>eql?</tt>;
- *  the order from +array+ is preserved:
+ *  Returns a new array containing only those elements of +self+
+ *  that are not found in +other_array+;
+ *  the order from +self+ is preserved:
  *
- *    [0, 1, 1, 2, 1, 1, 3, 1, 1] - [1] # => [0, 2, 3]
- *    [0, 1, 2, 3] - [3, 0] # => [1, 2]
- *    [0, 1, 2] - [4] # => [0, 1, 2]
+ *    [0, 1, 1, 2, 1, 1, 3, 1, 1] - [1]             # => [0, 2, 3]
+ *    [0, 1, 1, 2, 1, 1, 3, 1, 1] - [3, 2, 0, :foo] # => [1, 1, 1, 1, 1, 1]
+ *    [0, 1, 2] - [:foo]                            # => [0, 1, 2]
  *
- *  Related: Array#difference.
+ *  Element are compared using method <tt>#eql?</tt>
+ *  (as defined in each element of +self+).
+ *
+ *  Related: see {Methods for Combining}[rdoc-ref:Array@Methods+for+Combining].
  */
 
-static VALUE
+VALUE
 rb_ary_diff(VALUE ary1, VALUE ary2)
 {
     VALUE ary3;
@@ -5532,38 +5677,40 @@ rb_ary_diff(VALUE ary1, VALUE ary2)
     ary3 = rb_ary_new();
 
     if (RARRAY_LEN(ary1) <= SMALL_ARRAY_LEN || RARRAY_LEN(ary2) <= SMALL_ARRAY_LEN) {
-	for (i=0; i<RARRAY_LEN(ary1); i++) {
-	    VALUE elt = rb_ary_elt(ary1, i);
-	    if (rb_ary_includes_by_eql(ary2, elt)) continue;
-	    rb_ary_push(ary3, elt);
-	}
-	return ary3;
+        for (i=0; i<RARRAY_LEN(ary1); i++) {
+            VALUE elt = rb_ary_elt(ary1, i);
+            if (rb_ary_includes_by_eql(ary2, elt)) continue;
+            rb_ary_push(ary3, elt);
+        }
+        return ary3;
     }
 
     hash = ary_make_hash(ary2);
     for (i=0; i<RARRAY_LEN(ary1); i++) {
         if (rb_hash_stlike_lookup(hash, RARRAY_AREF(ary1, i), NULL)) continue;
-	rb_ary_push(ary3, rb_ary_elt(ary1, i));
+        rb_ary_push(ary3, rb_ary_elt(ary1, i));
     }
-    ary_recycle_hash(hash);
+
     return ary3;
 }
 
 /*
  *  call-seq:
- *    array.difference(*other_arrays) -> new_array
+ *    difference(*other_arrays = []) -> new_array
  *
- *  Returns a new \Array containing only those elements from +self+
- *  that are not found in any of the Arrays +other_arrays+;
+ *  Returns a new array containing only those elements from +self+
+ *  that are not found in any of the given +other_arrays+;
  *  items are compared using <tt>eql?</tt>;  order from +self+ is preserved:
  *
  *    [0, 1, 1, 2, 1, 1, 3, 1, 1].difference([1]) # => [0, 2, 3]
- *    [0, 1, 2, 3].difference([3, 0], [1, 3]) # => [2]
- *    [0, 1, 2].difference([4]) # => [0, 1, 2]
+ *    [0, 1, 2, 3].difference([3, 0], [1, 3])     # => [2]
+ *    [0, 1, 2].difference([4])                   # => [0, 1, 2]
+ *    [0, 1, 2].difference                        # => [0, 1, 2]
  *
- *  Returns a copy of +self+ if no arguments given.
+ *  Returns a copy of +self+ if no arguments are given.
  *
- *  Related: Array#-.
+ *  Related: Array#-;
+ *  see also {Methods for Combining}[rdoc-ref:Array@Methods+for+Combining].
  */
 
 static VALUE
@@ -5587,7 +5734,7 @@ rb_ary_difference_multi(int argc, VALUE *argv, VALUE ary)
         VALUE elt = rb_ary_elt(ary, i);
         for (j = 0; j < argc; j++) {
             if (is_hash[j]) {
-                if (rb_hash_stlike_lookup(argv[j], RARRAY_AREF(ary, i), NULL))
+                if (rb_hash_stlike_lookup(argv[j], elt, NULL))
                     break;
             }
             else {
@@ -5605,19 +5752,25 @@ rb_ary_difference_multi(int argc, VALUE *argv, VALUE ary)
 
 /*
  *  call-seq:
- *    array & other_array -> new_array
+ *    self & other_array -> new_array
  *
- *  Returns a new \Array containing each element found in both +array+ and \Array +other_array+;
- *  duplicates are omitted; items are compared using <tt>eql?</tt>:
+ *  Returns a new array containing the _intersection_ of +self+ and +other_array+;
+ *  that is, containing those elements found in both +self+ and +other_array+:
  *
  *    [0, 1, 2, 3] & [1, 2] # => [1, 2]
- *    [0, 1, 0, 1] & [0, 1] # => [0, 1]
  *
- *  Preserves order from +array+:
+ *  Omits duplicates:
+ *
+ *    [0, 1, 1, 0] & [0, 1] # => [0, 1]
+ *
+ *  Preserves order from +self+:
  *
  *    [0, 1, 2] & [3, 2, 1, 0] # => [0, 1, 2]
  *
- *  Related: Array#intersection.
+ *  Identifies common elements using method <tt>#eql?</tt>
+ *  (as defined in each element of +self+).
+ *
+ *  Related: see {Methods for Combining}[rdoc-ref:Array@Methods+for+Combining].
  */
 
 
@@ -5633,47 +5786,47 @@ rb_ary_and(VALUE ary1, VALUE ary2)
     if (RARRAY_LEN(ary1) == 0 || RARRAY_LEN(ary2) == 0) return ary3;
 
     if (RARRAY_LEN(ary1) <= SMALL_ARRAY_LEN && RARRAY_LEN(ary2) <= SMALL_ARRAY_LEN) {
-	for (i=0; i<RARRAY_LEN(ary1); i++) {
-	    v = RARRAY_AREF(ary1, i);
-	    if (!rb_ary_includes_by_eql(ary2, v)) continue;
-	    if (rb_ary_includes_by_eql(ary3, v)) continue;
-	    rb_ary_push(ary3, v);
-	}
-	return ary3;
+        for (i=0; i<RARRAY_LEN(ary1); i++) {
+            v = RARRAY_AREF(ary1, i);
+            if (!rb_ary_includes_by_eql(ary2, v)) continue;
+            if (rb_ary_includes_by_eql(ary3, v)) continue;
+            rb_ary_push(ary3, v);
+        }
+        return ary3;
     }
 
     hash = ary_make_hash(ary2);
 
     for (i=0; i<RARRAY_LEN(ary1); i++) {
-	v = RARRAY_AREF(ary1, i);
-	vv = (st_data_t)v;
+        v = RARRAY_AREF(ary1, i);
+        vv = (st_data_t)v;
         if (rb_hash_stlike_delete(hash, &vv, 0)) {
-	    rb_ary_push(ary3, v);
-	}
+            rb_ary_push(ary3, v);
+        }
     }
-    ary_recycle_hash(hash);
 
     return ary3;
 }
 
 /*
  *  call-seq:
- *    array.intersection(*other_arrays) -> new_array
+ *    intersection(*other_arrays) -> new_array
  *
- *  Returns a new \Array containing each element found both in +self+
- *  and in all of the given Arrays +other_arrays+;
- *  duplicates are omitted; items are compared using <tt>eql?</tt>:
+ *  Returns a new array containing each element in +self+ that is +#eql?+
+ *  to at least one element in each of the given +other_arrays+;
+ *  duplicates are omitted:
  *
- *    [0, 1, 2, 3].intersection([0, 1, 2], [0, 1, 3]) # => [0, 1]
  *    [0, 0, 1, 1, 2, 3].intersection([0, 1, 2], [0, 1, 3]) # => [0, 1]
  *
- *  Preserves order from +self+:
+ *  Each element must correctly implement method <tt>#hash</tt>.
+ *
+ *  Order from +self+ is preserved:
  *
  *    [0, 1, 2].intersection([2, 1, 0]) # => [0, 1, 2]
  *
- *  Returns a copy of +self+ if no arguments given.
+ *  Returns a copy of +self+ if no arguments are given.
  *
- *  Related: Array#&.
+ *  Related: see {Methods for Combining}[rdoc-ref:Array@Methods+for+Combining].
  */
 
 static VALUE
@@ -5722,9 +5875,9 @@ rb_ary_union_hash(VALUE hash, VALUE ary2)
 
 /*
  *  call-seq:
- *    array | other_array -> new_array
+ *    self | other_array -> new_array
  *
- *  Returns the union of +array+ and \Array +other_array+;
+ *  Returns the union of +self+ and +other_array+;
  *  duplicates are removed; order is preserved;
  *  items are compared using <tt>eql?</tt>:
  *
@@ -5732,44 +5885,49 @@ rb_ary_union_hash(VALUE hash, VALUE ary2)
  *    [0, 1, 1] | [2, 2, 3] # => [0, 1, 2, 3]
  *    [0, 1, 2] | [3, 2, 1, 0] # => [0, 1, 2, 3]
  *
- *  Related: Array#union.
+ *  Related: see {Methods for Combining}[rdoc-ref:Array@Methods+for+Combining].
  */
 
 static VALUE
 rb_ary_or(VALUE ary1, VALUE ary2)
 {
-    VALUE hash, ary3;
+    VALUE hash;
 
     ary2 = to_ary(ary2);
     if (RARRAY_LEN(ary1) + RARRAY_LEN(ary2) <= SMALL_ARRAY_LEN) {
-	ary3 = rb_ary_new();
+        VALUE ary3 = rb_ary_new();
         rb_ary_union(ary3, ary1);
         rb_ary_union(ary3, ary2);
-	return ary3;
+        return ary3;
     }
 
     hash = ary_make_hash(ary1);
     rb_ary_union_hash(hash, ary2);
 
-    ary3 = rb_hash_values(hash);
-    ary_recycle_hash(hash);
-    return ary3;
+    return rb_hash_values(hash);
 }
 
 /*
  *  call-seq:
- *    array.union(*other_arrays) -> new_array
+ *    union(*other_arrays) -> new_array
  *
- *  Returns a new \Array that is the union of +self+ and all given Arrays +other_arrays+;
- *  duplicates are removed;  order is preserved;  items are compared using <tt>eql?</tt>:
+ *  Returns a new array that is the union of the elements of +self+
+ *  and all given arrays +other_arrays+;
+ *  items are compared using <tt>eql?</tt>:
  *
  *    [0, 1, 2, 3].union([4, 5], [6, 7]) # => [0, 1, 2, 3, 4, 5, 6, 7]
+ *
+ *  Removes duplicates (preserving the first found):
+ *
  *    [0, 1, 1].union([2, 1], [3, 1]) # => [0, 1, 2, 3]
- *    [0, 1, 2, 3].union([3, 2], [1, 0]) # => [0, 1, 2, 3]
  *
- *  Returns a copy of +self+ if no arguments given.
+ *  Preserves order (preserving the position of the first found):
+ *
+ *    [3, 2, 1, 0].union([5, 3], [4, 2]) # => [3, 2, 1, 0, 5, 4]
+ *
+ *  With no arguments given, returns a copy of +self+.
  *
- *  Related: Array#|.
+ *  Related: see {Methods for Combining}[rdoc-ref:Array@Methods+for+Combining].
  */
 
 static VALUE
@@ -5777,7 +5935,7 @@ rb_ary_union_multi(int argc, VALUE *argv, VALUE ary)
 {
     int i;
     long sum;
-    VALUE hash, ary_union;
+    VALUE hash;
 
     sum = RARRAY_LEN(ary);
     for (i = 0; i < argc; i++) {
@@ -5786,7 +5944,7 @@ rb_ary_union_multi(int argc, VALUE *argv, VALUE ary)
     }
 
     if (sum <= SMALL_ARRAY_LEN) {
-        ary_union = rb_ary_new();
+        VALUE ary_union = rb_ary_new();
 
         rb_ary_union(ary_union, ary);
         for (i = 0; i < argc; i++) rb_ary_union(ary_union, argv[i]);
@@ -5797,24 +5955,21 @@ rb_ary_union_multi(int argc, VALUE *argv, VALUE ary)
     hash = ary_make_hash(ary);
     for (i = 0; i < argc; i++) rb_ary_union_hash(hash, argv[i]);
 
-    ary_union = rb_hash_values(hash);
-    ary_recycle_hash(hash);
-    return ary_union;
+    return rb_hash_values(hash);
 }
 
 /*
  *  call-seq:
- *     ary.intersect?(other_ary)   -> true or false
+ *    intersect?(other_array) -> true or false
+ *
+ *  Returns whether +other_array+ has at least one element that is +#eql?+ to some element of +self+:
  *
- *  Returns +true+ if the array and +other_ary+ have at least one element in
- *  common, otherwise returns +false+:
+ *    [1, 2, 3].intersect?([3, 4, 5]) # => true
+ *    [1, 2, 3].intersect?([4, 5, 6]) # => false
  *
- *     a = [ 1, 2, 3 ]
- *     b = [ 3, 4, 5 ]
- *     c = [ 5, 6, 7 ]
- *     a.intersect?(b)   #=> true
- *     a.intersect?(c)   #=> false
+ *  Each element must correctly implement method <tt>#hash</tt>.
  *
+ *  Related: see {Methods for Querying}[rdoc-ref:Array@Methods+for+Querying].
  */
 
 static VALUE
@@ -5853,7 +6008,6 @@ rb_ary_intersect_p(VALUE ary1, VALUE ary2)
             break;
         }
     }
-    ary_recycle_hash(hash);
 
     return result;
 }
@@ -5949,47 +6103,55 @@ ary_max_opt_string(VALUE ary, long i, VALUE vmax)
 
 /*
  *  call-seq:
- *    array.max -> element
- *    array.max {|a, b| ... } -> element
- *    array.max(n) -> new_array
- *    array.max(n) {|a, b| ... } -> new_array
+ *    max -> element
+ *    max(count) -> new_array
+ *    max {|a, b| ... } -> element
+ *    max(count) {|a, b| ... } -> new_array
  *
  *  Returns one of the following:
  *
  *  - The maximum-valued element from +self+.
- *  - A new \Array of maximum-valued elements selected from +self+.
+ *  - A new array of maximum-valued elements from +self+.
  *
- *  When no block is given, each element in +self+ must respond to method <tt><=></tt>
- *  with an \Integer.
+ *  Does not modify +self+.
+ *
+ *  With no block given, each element in +self+ must respond to method <tt>#<=></tt>
+ *  with a numeric.
  *
  *  With no argument and no block, returns the element in +self+
- *  having the maximum value per method <tt><=></tt>:
+ *  having the maximum value per method <tt>#<=></tt>:
  *
- *    [0, 1, 2].max # => 2
+ *    [1, 0, 3, 2].max # => 3
  *
- *  With an argument \Integer +n+ and no block, returns a new \Array with at most +n+ elements,
- *  in descending order per method <tt><=></tt>:
+ *  With non-negative numeric argument +count+ and no block,
+ *  returns a new array with at most +count+ elements,
+ *  in descending order, per method <tt>#<=></tt>:
  *
- *    [0, 1, 2, 3].max(3) # => [3, 2, 1]
- *    [0, 1, 2, 3].max(6) # => [3, 2, 1, 0]
+ *    [1, 0, 3, 2].max(3)   # => [3, 2, 1]
+ *    [1, 0, 3, 2].max(3.0) # => [3, 2, 1]
+ *    [1, 0, 3, 2].max(9)   # => [3, 2, 1, 0]
+ *    [1, 0, 3, 2].max(0)   # => []
  *
- *  When a block is given, the block must return an \Integer.
+ *  With a block given, the block must return a numeric.
  *
- *  With a block and no argument, calls the block <tt>self.size-1</tt> times to compare elements;
+ *  With a block and no argument, calls the block <tt>self.size - 1</tt> times to compare elements;
  *  returns the element having the maximum value per the block:
  *
- *    ['0', '00', '000'].max {|a, b| a.size <=> b.size } # => "000"
+ *    ['0', '', '000', '00'].max {|a, b| a.size <=> b.size }
+ *    # => "000"
  *
- *  With an argument +n+ and a block, returns a new \Array with at most +n+ elements,
- *  in descending order per the block:
+ *  With non-negative numeric argument +count+ and a block,
+ *  returns a new array with at most +count+ elements,
+ *  in descending order, per the block:
  *
- *    ['0', '00', '000'].max(2) {|a, b| a.size <=> b.size } # => ["000", "00"]
+ *    ['0', '', '000', '00'].max(2) {|a, b| a.size <=> b.size }
+ *    # => ["000", "00"]
  *
+ *  Related: see {Methods for Fetching}[rdoc-ref:Array@Methods+for+Fetching].
  */
 static VALUE
 rb_ary_max(int argc, VALUE *argv, VALUE ary)
 {
-    struct cmp_opt_data cmp_opt = { 0, 0 };
     VALUE result = Qundef, v;
     VALUE num;
     long i;
@@ -5999,23 +6161,23 @@ rb_ary_max(int argc, VALUE *argv, VALUE ary)
 
     const long n = RARRAY_LEN(ary);
     if (rb_block_given_p()) {
-	for (i = 0; i < RARRAY_LEN(ary); i++) {
-	   v = RARRAY_AREF(ary, i);
-	   if (result == Qundef || rb_cmpint(rb_yield_values(2, v, result), v, result) > 0) {
-	       result = v;
-	   }
-	}
+        for (i = 0; i < RARRAY_LEN(ary); i++) {
+           v = RARRAY_AREF(ary, i);
+           if (UNDEF_P(result) || rb_cmpint(rb_yield_values(2, v, result), v, result) > 0) {
+               result = v;
+           }
+        }
     }
     else if (n > 0) {
         result = RARRAY_AREF(ary, 0);
         if (n > 1) {
-            if (FIXNUM_P(result) && CMP_OPTIMIZABLE(cmp_opt, Integer)) {
+            if (FIXNUM_P(result) && CMP_OPTIMIZABLE(INTEGER)) {
                 return ary_max_opt_fixnum(ary, 1, result);
             }
-            else if (STRING_P(result) && CMP_OPTIMIZABLE(cmp_opt, String)) {
+            else if (STRING_P(result) && CMP_OPTIMIZABLE(STRING)) {
                 return ary_max_opt_string(ary, 1, result);
             }
-            else if (RB_FLOAT_TYPE_P(result) && CMP_OPTIMIZABLE(cmp_opt, Float)) {
+            else if (RB_FLOAT_TYPE_P(result) && CMP_OPTIMIZABLE(FLOAT)) {
                 return ary_max_opt_float(ary, 1, result);
             }
             else {
@@ -6023,7 +6185,7 @@ rb_ary_max(int argc, VALUE *argv, VALUE ary)
             }
         }
     }
-    if (result == Qundef) return Qnil;
+    if (UNDEF_P(result)) return Qnil;
     return result;
 }
 
@@ -6118,47 +6280,55 @@ ary_min_opt_string(VALUE ary, long i, VALUE vmin)
 
 /*
  *  call-seq:
- *    array.min -> element
- *    array.min { |a, b| ... } -> element
- *    array.min(n) -> new_array
- *    array.min(n) { |a, b| ... } -> new_array
+ *    min -> element
+ *    min(count) -> new_array
+ *    min {|a, b| ... } -> element
+ *    min(count) {|a, b| ... } -> new_array
  *
  *  Returns one of the following:
  *
  *  - The minimum-valued element from +self+.
- *  - A new \Array of minimum-valued elements selected from +self+.
+ *  - A new array of minimum-valued elements from +self+.
  *
- *  When no block is given, each element in +self+ must respond to method <tt><=></tt>
- *  with an \Integer.
+ *  Does not modify +self+.
+ *
+ *  With no block given, each element in +self+ must respond to method <tt>#<=></tt>
+ *  with a numeric.
  *
  *  With no argument and no block, returns the element in +self+
- *  having the minimum value per method <tt><=></tt>:
+ *  having the minimum value per method <tt>#<=></tt>:
  *
- *    [0, 1, 2].min # => 0
+ *    [1, 0, 3, 2].min # => 0
  *
- *  With \Integer argument +n+ and no block, returns a new \Array with at most +n+ elements,
- *  in ascending order per method <tt><=></tt>:
+ *  With non-negative numeric argument +count+ and no block,
+ *  returns a new array with at most +count+ elements,
+ *  in ascending order, per method <tt>#<=></tt>:
  *
- *    [0, 1, 2, 3].min(3) # => [0, 1, 2]
- *    [0, 1, 2, 3].min(6) # => [0, 1, 2, 3]
+ *    [1, 0, 3, 2].min(3)   # => [0, 1, 2]
+ *    [1, 0, 3, 2].min(3.0) # => [0, 1, 2]
+ *    [1, 0, 3, 2].min(9)   # => [0, 1, 2, 3]
+ *    [1, 0, 3, 2].min(0)   # => []
  *
- *  When a block is given, the block must return an Integer.
+ *  With a block given, the block must return a numeric.
  *
- *  With a block and no argument, calls the block <tt>self.size-1</tt> times to compare elements;
+ *  With a block and no argument, calls the block <tt>self.size - 1</tt> times to compare elements;
  *  returns the element having the minimum value per the block:
  *
- *    ['0', '00', '000'].min { |a, b| a.size <=> b.size } # => "0"
+ *    ['0', '', '000', '00'].min {|a, b| a.size <=> b.size }
+ *    # => ""
  *
- *  With an argument +n+ and a block, returns a new \Array with at most +n+ elements,
- *  in ascending order per the block:
+ *  With non-negative numeric argument +count+ and a block,
+ *  returns a new array with at most +count+ elements,
+ *  in ascending order, per the block:
  *
- *    ['0', '00', '000'].min(2) {|a, b| a.size <=> b.size } # => ["0", "00"]
+ *    ['0', '', '000', '00'].min(2) {|a, b| a.size <=> b.size }
+ *    # => ["", "0"]
  *
+ *  Related: see {Methods for Fetching}[rdoc-ref:Array@Methods+for+Fetching].
  */
 static VALUE
 rb_ary_min(int argc, VALUE *argv, VALUE ary)
 {
-    struct cmp_opt_data cmp_opt = { 0, 0 };
     VALUE result = Qundef, v;
     VALUE num;
     long i;
@@ -6168,23 +6338,23 @@ rb_ary_min(int argc, VALUE *argv, VALUE ary)
 
     const long n = RARRAY_LEN(ary);
     if (rb_block_given_p()) {
-	for (i = 0; i < RARRAY_LEN(ary); i++) {
-	   v = RARRAY_AREF(ary, i);
-	   if (result == Qundef || rb_cmpint(rb_yield_values(2, v, result), v, result) < 0) {
-	       result = v;
-	   }
-	}
+        for (i = 0; i < RARRAY_LEN(ary); i++) {
+           v = RARRAY_AREF(ary, i);
+           if (UNDEF_P(result) || rb_cmpint(rb_yield_values(2, v, result), v, result) < 0) {
+               result = v;
+           }
+        }
     }
     else if (n > 0) {
         result = RARRAY_AREF(ary, 0);
         if (n > 1) {
-            if (FIXNUM_P(result) && CMP_OPTIMIZABLE(cmp_opt, Integer)) {
+            if (FIXNUM_P(result) && CMP_OPTIMIZABLE(INTEGER)) {
                 return ary_min_opt_fixnum(ary, 1, result);
             }
-            else if (STRING_P(result) && CMP_OPTIMIZABLE(cmp_opt, String)) {
+            else if (STRING_P(result) && CMP_OPTIMIZABLE(STRING)) {
                 return ary_min_opt_string(ary, 1, result);
             }
-            else if (RB_FLOAT_TYPE_P(result) && CMP_OPTIMIZABLE(cmp_opt, Float)) {
+            else if (RB_FLOAT_TYPE_P(result) && CMP_OPTIMIZABLE(FLOAT)) {
                 return ary_min_opt_float(ary, 1, result);
             }
             else {
@@ -6192,32 +6362,31 @@ rb_ary_min(int argc, VALUE *argv, VALUE ary)
             }
         }
     }
-    if (result == Qundef) return Qnil;
+    if (UNDEF_P(result)) return Qnil;
     return result;
 }
 
 /*
  *  call-seq:
- *    array.minmax -> [min_val, max_val]
- *    array.minmax {|a, b| ... } -> [min_val, max_val]
+ *    minmax -> array
+ *    minmax {|a, b| ... } -> array
  *
- *  Returns a new 2-element \Array containing the minimum and maximum values
- *  from +self+, either per method <tt><=></tt> or per a given block:.
+ *  Returns a 2-element array containing the minimum-valued and maximum-valued
+ *  elements from +self+;
+ *  does not modify +self+.
  *
- *  When no block is given, each element in +self+ must respond to method <tt><=></tt>
- *  with an \Integer;
- *  returns a new 2-element \Array containing the minimum and maximum values
- *  from +self+, per method <tt><=></tt>:
+ *  With no block given, the minimum and maximum values are determined using method <tt>#<=></tt>:
  *
- *    [0, 1, 2].minmax # => [0, 2]
+ *    [1, 0, 3, 2].minmax # => [0, 3]
  *
- *  When a block is given, the block must return an \Integer;
- *  the block is called <tt>self.size-1</tt> times to compare elements;
- *  returns a new 2-element \Array containing the minimum and maximum values
- *  from +self+, per the block:
+ *  With a block given, the block must return a numeric;
+ *  the block is called <tt>self.size - 1</tt> times to compare elements;
+ *  returns the elements having the minimum and maximum values per the block:
  *
- *    ['0', '00', '000'].minmax {|a, b| a.size <=> b.size } # => ["0", "000"]
+ *    ['0', '', '000', '00'].minmax {|a, b| a.size <=> b.size }
+ *    # => ["", "000"]
  *
+ *  Related: see {Methods for Fetching}[rdoc-ref:Array@Methods+for+Fetching].
  */
 static VALUE
 rb_ary_minmax(VALUE ary)
@@ -6237,32 +6406,30 @@ push_value(st_data_t key, st_data_t val, st_data_t ary)
 
 /*
  *  call-seq:
- *    array.uniq! -> self or nil
- *    array.uniq! {|element| ... } -> self or nil
+ *    uniq! -> self or nil
+ *    uniq! {|element| ... } -> self or nil
  *
  *  Removes duplicate elements from +self+, the first occurrence always being retained;
  *  returns +self+ if any elements removed, +nil+ otherwise.
  *
  *  With no block given, identifies and removes elements using method <tt>eql?</tt>
- *  to compare.
- *
- *  Returns +self+ if any elements removed:
+ *  to compare elements:
  *
  *    a = [0, 0, 1, 1, 2, 2]
  *    a.uniq! # => [0, 1, 2]
- *
- *  Returns +nil+ if no elements removed.
+ *    a.uniq! # => nil
  *
  *  With a block given, calls the block for each element;
- *  identifies (using method <tt>eql?</tt>) and removes
- *  elements for which the block returns duplicate values.
- *
- *  Returns +self+ if any elements removed:
+ *  identifies and omits "duplicate" elements using method <tt>eql?</tt>
+ *  to compare <i>block return values</i>;
+ *  that is, an element is a duplicate if its block return value
+ *  is the same as that of a previous element:
  *
  *    a = ['a', 'aa', 'aaa', 'b', 'bb', 'bbb']
- *    a.uniq! {|element| element.size } # => ['a', 'aa', 'aaa']
+ *    a.uniq! {|element| element.size } # => ["a", "aa", "aaa"]
+ *    a.uniq! {|element| element.size } # => nil
  *
- *  Returns +nil+ if no elements removed.
+ *  Related: see {Methods for Deleting}[rdoc-ref:Array@Methods+for+Deleting].
  */
 static VALUE
 rb_ary_uniq_bang(VALUE ary)
@@ -6274,48 +6441,50 @@ rb_ary_uniq_bang(VALUE ary)
     if (RARRAY_LEN(ary) <= 1)
         return Qnil;
     if (rb_block_given_p())
-	hash = ary_make_hash_by(ary);
+        hash = ary_make_hash_by(ary);
     else
-	hash = ary_make_hash(ary);
+        hash = ary_make_hash(ary);
 
     hash_size = RHASH_SIZE(hash);
     if (RARRAY_LEN(ary) == hash_size) {
-	return Qnil;
+        return Qnil;
     }
     rb_ary_modify_check(ary);
     ARY_SET_LEN(ary, 0);
-    if (ARY_SHARED_P(ary) && !ARY_EMBED_P(ary)) {
-	rb_ary_unshare(ary);
-	FL_SET_EMBED(ary);
+    if (ARY_SHARED_P(ary)) {
+        rb_ary_unshare(ary);
+        FL_SET_EMBED(ary);
     }
     ary_resize_capa(ary, hash_size);
     rb_hash_foreach(hash, push_value, ary);
-    ary_recycle_hash(hash);
 
     return ary;
 }
 
 /*
  *  call-seq:
- *    array.uniq -> new_array
- *    array.uniq {|element| ... } -> new_array
+ *    uniq -> new_array
+ *    uniq {|element| ... } -> new_array
  *
- *  Returns a new \Array containing those elements from +self+ that are not duplicates,
+ *  Returns a new array containing those elements from +self+ that are not duplicates,
  *  the first occurrence always being retained.
  *
- *  With no block given, identifies and omits duplicates using method <tt>eql?</tt>
- *  to compare:
+ *  With no block given, identifies and omits duplicate elements using method <tt>eql?</tt>
+ *  to compare elements:
  *
  *    a = [0, 0, 1, 1, 2, 2]
  *    a.uniq # => [0, 1, 2]
  *
  *  With a block given, calls the block for each element;
- *  identifies (using method <tt>eql?</tt>) and omits duplicate values,
- *  that is, those elements for which the block returns the same value:
+ *  identifies and omits "duplicate" elements using method <tt>eql?</tt>
+ *  to compare <i>block return values</i>;
+ *  that is, an element is a duplicate if its block return value
+ *  is the same as that of a previous element:
  *
  *    a = ['a', 'aa', 'aaa', 'b', 'bb', 'bbb']
  *    a.uniq {|element| element.size } # => ["a", "aa", "aaa"]
  *
+ *  Related: {Methods for Fetching}[rdoc-ref:Array@Methods+for+Fetching].
  */
 
 static VALUE
@@ -6328,15 +6497,12 @@ rb_ary_uniq(VALUE ary)
         uniq = rb_ary_dup(ary);
     }
     else if (rb_block_given_p()) {
-	hash = ary_make_hash_by(ary);
-	uniq = rb_hash_values(hash);
+        hash = ary_make_hash_by(ary);
+        uniq = rb_hash_values(hash);
     }
     else {
-	hash = ary_make_hash(ary);
-	uniq = rb_hash_values(hash);
-    }
-    if (hash) {
-        ary_recycle_hash(hash);
+        hash = ary_make_hash(ary);
+        uniq = rb_hash_values(hash);
     }
 
     return uniq;
@@ -6344,11 +6510,18 @@ rb_ary_uniq(VALUE ary)
 
 /*
  *  call-seq:
- *    array.compact! -> self or nil
+ *    compact! -> self or nil
  *
- *  Removes all +nil+ elements from +self+.
+ *  Removes all +nil+ elements from +self+;
+ *  Returns +self+ if any elements are removed, +nil+ otherwise:
  *
- *  Returns +self+ if any elements removed, otherwise +nil+.
+ *    a = [nil, 0, nil, false, nil, '', nil, [], nil, {}]
+ *    a.compact! # => [0, false, "", [], {}]
+ *    a          # => [0, false, "", [], {}]
+ *    a.compact! # => nil
+ *
+ *  Related: Array#compact;
+ *  see also {Methods for Deleting}[rdoc-ref:Array@Methods+for+Deleting].
  */
 
 static VALUE
@@ -6358,16 +6531,16 @@ rb_ary_compact_bang(VALUE ary)
     long n;
 
     rb_ary_modify(ary);
-    p = t = (VALUE *)RARRAY_CONST_PTR_TRANSIENT(ary); /* WB: no new reference */
+    p = t = (VALUE *)RARRAY_CONST_PTR(ary); /* WB: no new reference */
     end = p + RARRAY_LEN(ary);
 
     while (t < end) {
-	if (NIL_P(*t)) t++;
-	else *p++ = *t++;
+        if (NIL_P(*t)) t++;
+        else *p++ = *t++;
     }
-    n = p - RARRAY_CONST_PTR_TRANSIENT(ary);
+    n = p - RARRAY_CONST_PTR(ary);
     if (RARRAY_LEN(ary) == n) {
-	return Qnil;
+        return Qnil;
     }
     ary_resize_smaller(ary, n);
 
@@ -6376,12 +6549,16 @@ rb_ary_compact_bang(VALUE ary)
 
 /*
  *  call-seq:
- *    array.compact -> new_array
+ *    compact -> new_array
  *
- *  Returns a new \Array containing all non-+nil+ elements from +self+:
+ *  Returns a new array containing only the non-+nil+ elements from +self+;
+ *  element order is preserved:
  *
- *    a = [nil, 0, nil, 1, nil, 2, nil]
- *    a.compact # => [0, 1, 2]
+ *    a = [nil, 0, nil, false, nil, '', nil, [], nil, {}]
+ *    a.compact # => [0, false, "", [], {}]
+ *
+ *  Related: Array#compact!;
+ *  see also {Methods for Deleting}[rdoc-ref:Array@Methods+for+Deleting].
  */
 
 static VALUE
@@ -6394,29 +6571,29 @@ rb_ary_compact(VALUE ary)
 
 /*
  *  call-seq:
- *    array.count -> an_integer
- *    array.count(obj) -> an_integer
- *    array.count {|element| ... } -> an_integer
+ *    count -> integer
+ *    count(object) -> integer
+ *    count {|element| ... } -> integer
  *
  *  Returns a count of specified elements.
  *
  *  With no argument and no block, returns the count of all elements:
  *
- *    [0, 1, 2].count # => 3
- *    [].count # => 0
+ *    [0, :one, 'two', 3, 3.0].count # => 5
  *
- *  With argument +obj+, returns the count of elements <tt>==</tt> to +obj+:
+ *  With argument +object+ given, returns the count of elements <tt>==</tt> to +object+:
  *
- *    [0, 1, 2, 0.0].count(0) # => 2
- *    [0, 1, 2].count(3) # => 0
+ *    [0, :one, 'two', 3, 3.0].count(3) # => 2
  *
  *  With no argument and a block given, calls the block with each element;
  *  returns the count of elements for which the block returns a truthy value:
  *
- *    [0, 1, 2, 3].count {|element| element > 1} # => 2
+ *    [0, 1, 2, 3].count {|element| element > 1 } # => 2
+ *
+ *  With argument +object+ and a block given, issues a warning, ignores the block,
+ *  and returns the count of elements <tt>==</tt> to +object+.
  *
- *  With argument +obj+ and a block given, issues a warning, ignores the block,
- *  and returns the count of elements <tt>==</tt> to +obj+.
+ *  Related: see {Methods for Querying}[rdoc-ref:Array@Methods+for+Querying].
  */
 
 static VALUE
@@ -6425,25 +6602,25 @@ rb_ary_count(int argc, VALUE *argv, VALUE ary)
     long i, n = 0;
 
     if (rb_check_arity(argc, 0, 1) == 0) {
-	VALUE v;
+        VALUE v;
 
-	if (!rb_block_given_p())
-	    return LONG2NUM(RARRAY_LEN(ary));
+        if (!rb_block_given_p())
+            return LONG2NUM(RARRAY_LEN(ary));
 
-	for (i = 0; i < RARRAY_LEN(ary); i++) {
-	    v = RARRAY_AREF(ary, i);
-	    if (RTEST(rb_yield(v))) n++;
-	}
+        for (i = 0; i < RARRAY_LEN(ary); i++) {
+            v = RARRAY_AREF(ary, i);
+            if (RTEST(rb_yield(v))) n++;
+        }
     }
     else {
         VALUE obj = argv[0];
 
-	if (rb_block_given_p()) {
-	    rb_warn("given block not used");
-	}
-	for (i = 0; i < RARRAY_LEN(ary); i++) {
-	    if (rb_equal(RARRAY_AREF(ary, i), obj)) n++;
-	}
+        if (rb_block_given_p()) {
+            rb_warn("given block not used");
+        }
+        for (i = 0; i < RARRAY_LEN(ary); i++) {
+            if (rb_equal(RARRAY_AREF(ary, i), obj)) n++;
+        }
     }
 
     return LONG2NUM(n);
@@ -6453,9 +6630,8 @@ static VALUE
 flatten(VALUE ary, int level)
 {
     long i;
-    VALUE stack, result, tmp = 0, elt, vmemo;
-    st_table *memo = 0;
-    st_data_t id;
+    VALUE stack, result, tmp = 0, elt;
+    VALUE memo = Qfalse;
 
     for (i = 0; i < RARRAY_LEN(ary); i++) {
         elt = RARRAY_AREF(ary, i);
@@ -6469,7 +6645,7 @@ flatten(VALUE ary, int level)
     }
 
     result = ary_new(0, RARRAY_LEN(ary));
-    ary_memcpy(result, 0, i, RARRAY_CONST_PTR_TRANSIENT(ary));
+    ary_memcpy(result, 0, i, RARRAY_CONST_PTR(ary));
     ARY_SET_LEN(result, i);
 
     stack = ary_new(0, ARY_DEFAULT_SIZE);
@@ -6477,64 +6653,58 @@ flatten(VALUE ary, int level)
     rb_ary_push(stack, LONG2NUM(i + 1));
 
     if (level < 0) {
-	vmemo = rb_hash_new();
-	RBASIC_CLEAR_CLASS(vmemo);
-	memo = st_init_numtable();
-	rb_hash_st_table_set(vmemo, memo);
-	st_insert(memo, (st_data_t)ary, (st_data_t)Qtrue);
-	st_insert(memo, (st_data_t)tmp, (st_data_t)Qtrue);
+        memo = rb_obj_hide(rb_ident_hash_new());
+        rb_hash_aset(memo, ary, Qtrue);
+        rb_hash_aset(memo, tmp, Qtrue);
     }
 
     ary = tmp;
     i = 0;
 
     while (1) {
-	while (i < RARRAY_LEN(ary)) {
-	    elt = RARRAY_AREF(ary, i++);
-	    if (level >= 0 && RARRAY_LEN(stack) / 2 >= level) {
-		rb_ary_push(result, elt);
-		continue;
-	    }
-	    tmp = rb_check_array_type(elt);
-	    if (RBASIC(result)->klass) {
-		if (memo) {
-		    RB_GC_GUARD(vmemo);
-		    st_clear(memo);
-		}
-		rb_raise(rb_eRuntimeError, "flatten reentered");
-	    }
-	    if (NIL_P(tmp)) {
-		rb_ary_push(result, elt);
-	    }
-	    else {
-		if (memo) {
-		    id = (st_data_t)tmp;
-		    if (st_is_member(memo, id)) {
-			st_clear(memo);
-			rb_raise(rb_eArgError, "tried to flatten recursive array");
-		    }
-		    st_insert(memo, id, (st_data_t)Qtrue);
-		}
-		rb_ary_push(stack, ary);
-		rb_ary_push(stack, LONG2NUM(i));
-		ary = tmp;
-		i = 0;
-	    }
-	}
-	if (RARRAY_LEN(stack) == 0) {
-	    break;
-	}
-	if (memo) {
-	    id = (st_data_t)ary;
-	    st_delete(memo, &id, 0);
-	}
-	tmp = rb_ary_pop(stack);
-	i = NUM2LONG(tmp);
-	ary = rb_ary_pop(stack);
+        while (i < RARRAY_LEN(ary)) {
+            elt = RARRAY_AREF(ary, i++);
+            if (level >= 0 && RARRAY_LEN(stack) / 2 >= level) {
+                rb_ary_push(result, elt);
+                continue;
+            }
+            tmp = rb_check_array_type(elt);
+            if (RBASIC(result)->klass) {
+                if (RTEST(memo)) {
+                    rb_hash_clear(memo);
+                }
+                rb_raise(rb_eRuntimeError, "flatten reentered");
+            }
+            if (NIL_P(tmp)) {
+                rb_ary_push(result, elt);
+            }
+            else {
+                if (memo) {
+                    if (rb_hash_aref(memo, tmp) == Qtrue) {
+                        rb_hash_clear(memo);
+                        rb_raise(rb_eArgError, "tried to flatten recursive array");
+                    }
+                    rb_hash_aset(memo, tmp, Qtrue);
+                }
+                rb_ary_push(stack, ary);
+                rb_ary_push(stack, LONG2NUM(i));
+                ary = tmp;
+                i = 0;
+            }
+        }
+        if (RARRAY_LEN(stack) == 0) {
+            break;
+        }
+        if (memo) {
+            rb_hash_delete(memo, ary);
+        }
+        tmp = rb_ary_pop(stack);
+        i = NUM2LONG(tmp);
+        ary = rb_ary_pop(stack);
     }
 
     if (memo) {
-	st_clear(memo);
+        rb_hash_clear(memo);
     }
 
     RBASIC_SET_CLASS(result, rb_cArray);
@@ -6543,33 +6713,37 @@ flatten(VALUE ary, int level)
 
 /*
  *  call-seq:
- *    array.flatten! -> self or nil
- *    array.flatten!(level) -> self or nil
+ *    flatten!(depth = nil) -> self or nil
+ *
+ *  Returns +self+ as a recursively flattening of +self+ to +depth+ levels of recursion;
+ *  +depth+ must be an
+ *  {integer-convertible object}[rdoc-ref:implicit_conversion.rdoc@Integer-Convertible+Objects],
+ *  or +nil+.
+ *  At each level of recursion:
  *
- *  Replaces each nested \Array in +self+ with the elements from that \Array;
- *  returns +self+ if any changes, +nil+ otherwise.
+ *  - Each element that is an array is "flattened"
+ *    (that is, replaced by its individual array elements).
+ *  - Each element that is not an array is unchanged
+ *    (even if the element is an object that has instance method +flatten+).
  *
- *  With non-negative \Integer argument +level+, flattens recursively through +level+ levels:
+ *  Returns +nil+ if no elements were flattened.
  *
- *    a = [ 0, [ 1, [2, 3], 4 ], 5 ]
- *    a.flatten!(1) # => [0, 1, [2, 3], 4, 5]
- *    a = [ 0, [ 1, [2, 3], 4 ], 5 ]
- *    a.flatten!(2) # => [0, 1, 2, 3, 4, 5]
- *    a = [ 0, [ 1, [2, 3], 4 ], 5 ]
- *    a.flatten!(3) # => [0, 1, 2, 3, 4, 5]
- *    [0, 1, 2].flatten!(1) # => nil
+ *  With non-negative integer argument +depth+, flattens recursively through +depth+ levels:
  *
- *  With no argument, a +nil+ argument, or with negative argument +level+, flattens all levels:
+ *    a = [ 0, [ 1, [2, 3], 4 ], 5, {foo: 0}, Set.new([6, 7]) ]
+ *    a                   # => [0, [1, [2, 3], 4], 5, {:foo=>0}, #<Set: {6, 7}>]
+ *    a.dup.flatten!(1)   # => [0, 1, [2, 3], 4, 5, {:foo=>0}, #<Set: {6, 7}>]
+ *    a.dup.flatten!(1.1) # => [0, 1, [2, 3], 4, 5, {:foo=>0}, #<Set: {6, 7}>]
+ *    a.dup.flatten!(2)   # => [0, 1, 2, 3, 4, 5, {:foo=>0}, #<Set: {6, 7}>]
+ *    a.dup.flatten!(3)   # => [0, 1, 2, 3, 4, 5, {:foo=>0}, #<Set: {6, 7}>]
  *
- *    a = [ 0, [ 1, [2, 3], 4 ], 5 ]
- *    a.flatten! # => [0, 1, 2, 3, 4, 5]
- *    [0, 1, 2].flatten! # => nil
- *    a = [ 0, [ 1, [2, 3], 4 ], 5 ]
- *    a.flatten!(-1) # => [0, 1, 2, 3, 4, 5]
- *    a = [ 0, [ 1, [2, 3], 4 ], 5 ]
- *    a.flatten!(-2) # => [0, 1, 2, 3, 4, 5]
- *    [0, 1, 2].flatten!(-1) # => nil
+ *  With +nil+ or negative argument +depth+, flattens all levels:
  *
+ *    a.dup.flatten!     # => [0, 1, 2, 3, 4, 5, {:foo=>0}, #<Set: {6, 7}>]
+ *    a.dup.flatten!(-1) # => [0, 1, 2, 3, 4, 5, {:foo=>0}, #<Set: {6, 7}>]
+ *
+ *  Related: Array#flatten;
+ *  see also {Methods for Assigning}[rdoc-ref:Array@Methods+for+Assigning].
  */
 
 static VALUE
@@ -6585,9 +6759,9 @@ rb_ary_flatten_bang(int argc, VALUE *argv, VALUE ary)
 
     result = flatten(ary, level);
     if (result == ary) {
-	return Qnil;
+        return Qnil;
     }
-    if (!(mod = ARY_EMBED_P(result))) rb_obj_freeze(result);
+    if (!(mod = ARY_EMBED_P(result))) rb_ary_freeze(result);
     rb_ary_replace(ary, result);
     if (mod) ARY_SET_EMBED_LEN(result, 0);
 
@@ -6596,35 +6770,37 @@ rb_ary_flatten_bang(int argc, VALUE *argv, VALUE ary)
 
 /*
  *  call-seq:
- *    array.flatten -> new_array
- *    array.flatten(level) -> new_array
- *
- *  Returns a new \Array that is a recursive flattening of +self+:
- *  - Each non-Array element is unchanged.
- *  - Each \Array is replaced by its individual elements.
- *
- *  With non-negative \Integer argument +level+, flattens recursively through +level+ levels:
- *
- *    a = [ 0, [ 1, [2, 3], 4 ], 5 ]
- *    a.flatten(0) # => [0, [1, [2, 3], 4], 5]
- *    a = [ 0, [ 1, [2, 3], 4 ], 5 ]
- *    a.flatten(1) # => [0, 1, [2, 3], 4, 5]
- *    a = [ 0, [ 1, [2, 3], 4 ], 5 ]
- *    a.flatten(2) # => [0, 1, 2, 3, 4, 5]
- *    a = [ 0, [ 1, [2, 3], 4 ], 5 ]
- *    a.flatten(3) # => [0, 1, 2, 3, 4, 5]
- *
- *  With no argument, a +nil+ argument, or with negative argument +level+, flattens all levels:
- *
- *    a = [ 0, [ 1, [2, 3], 4 ], 5 ]
- *    a.flatten # => [0, 1, 2, 3, 4, 5]
- *    [0, 1, 2].flatten # => [0, 1, 2]
- *    a = [ 0, [ 1, [2, 3], 4 ], 5 ]
- *    a.flatten(-1) # => [0, 1, 2, 3, 4, 5]
- *    a = [ 0, [ 1, [2, 3], 4 ], 5 ]
- *    a.flatten(-2) # => [0, 1, 2, 3, 4, 5]
- *    [0, 1, 2].flatten(-1) # => [0, 1, 2]
+ *    flatten(depth = nil) -> new_array
+ *
+ *  Returns a new array that is a recursive flattening of +self+
+ *  to +depth+ levels of recursion;
+ *  +depth+ must be an
+ *  {integer-convertible object}[rdoc-ref:implicit_conversion.rdoc@Integer-Convertible+Objects]
+ *  or +nil+.
+ *  At each level of recursion:
+ *
+ *  - Each element that is an array is "flattened"
+ *    (that is, replaced by its individual array elements).
+ *  - Each element that is not an array is unchanged
+ *    (even if the element is an object that has instance method +flatten+).
  *
+ *  With non-negative integer argument +depth+, flattens recursively through +depth+ levels:
+ *
+ *    a = [ 0, [ 1, [2, 3], 4 ], 5, {foo: 0}, Set.new([6, 7]) ]
+ *    a              # => [0, [1, [2, 3], 4], 5, {:foo=>0}, #<Set: {6, 7}>]
+ *    a.flatten(0)   # => [0, [1, [2, 3], 4], 5, {:foo=>0}, #<Set: {6, 7}>]
+ *    a.flatten(1  ) # => [0, 1, [2, 3], 4, 5, {:foo=>0}, #<Set: {6, 7}>]
+ *    a.flatten(1.1) # => [0, 1, [2, 3], 4, 5, {:foo=>0}, #<Set: {6, 7}>]
+ *    a.flatten(2)   # => [0, 1, 2, 3, 4, 5, {:foo=>0}, #<Set: {6, 7}>]
+ *    a.flatten(3)   # => [0, 1, 2, 3, 4, 5, {:foo=>0}, #<Set: {6, 7}>]
+ *
+ *  With +nil+ or negative +depth+, flattens all levels.
+ *
+ *    a.flatten     # => [0, 1, 2, 3, 4, 5, {:foo=>0}, #<Set: {6, 7}>]
+ *    a.flatten(-1) # => [0, 1, 2, 3, 4, 5, {:foo=>0}, #<Set: {6, 7}>]
+ *
+ *  Related: Array#flatten!;
+ *  see also {Methods for Converting}[rdoc-ref:Array@Methods+for+Converting].
  */
 
 static VALUE
@@ -6656,16 +6832,16 @@ rb_ary_shuffle_bang(rb_execution_context_t *ec, VALUE ary, VALUE randgen)
     rb_ary_modify(ary);
     i = len = RARRAY_LEN(ary);
     RARRAY_PTR_USE(ary, ptr, {
-	while (i) {
-	    long j = RAND_UPTO(i);
-	    VALUE tmp;
-            if (len != RARRAY_LEN(ary) || ptr != RARRAY_CONST_PTR_TRANSIENT(ary)) {
+        while (i > 1) {
+            long j = RAND_UPTO(i);
+            VALUE tmp;
+            if (len != RARRAY_LEN(ary) || ptr != RARRAY_CONST_PTR(ary)) {
                 rb_raise(rb_eRuntimeError, "modified during shuffle");
-	    }
-	    tmp = ptr[--i];
-	    ptr[i] = ptr[j];
-	    ptr[j] = tmp;
-	}
+            }
+            tmp = ptr[--i];
+            ptr[i] = ptr[j];
+            ptr[j] = tmp;
+        }
     }); /* WB: no new reference */
     return ary;
 }
@@ -6678,6 +6854,14 @@ rb_ary_shuffle(rb_execution_context_t *ec, VALUE ary, VALUE randgen)
     return ary;
 }
 
+static const rb_data_type_t ary_sample_memo_type = {
+    .wrap_struct_name = "ary_sample_memo",
+    .function = {
+        .dfree = (RUBY_DATA_FUNC)st_free_table,
+    },
+    .flags = RUBY_TYPED_WB_PROTECTED | RUBY_TYPED_FREE_IMMEDIATELY
+};
+
 static VALUE
 ary_sample(rb_execution_context_t *ec, VALUE ary, VALUE randgen, VALUE nv, VALUE to_array)
 {
@@ -6688,120 +6872,119 @@ ary_sample(rb_execution_context_t *ec, VALUE ary, VALUE randgen, VALUE nv, VALUE
 
     len = RARRAY_LEN(ary);
     if (!to_array) {
-	if (len < 2)
-	    i = 0;
-	else
-	    i = RAND_UPTO(len);
+        if (len < 2)
+            i = 0;
+        else
+            i = RAND_UPTO(len);
 
-	return rb_ary_elt(ary, i);
+        return rb_ary_elt(ary, i);
     }
     n = NUM2LONG(nv);
     if (n < 0) rb_raise(rb_eArgError, "negative sample number");
     if (n > len) n = len;
     if (n <= numberof(idx)) {
-	for (i = 0; i < n; ++i) {
-	    rnds[i] = RAND_UPTO(len - i);
-	}
+        for (i = 0; i < n; ++i) {
+            rnds[i] = RAND_UPTO(len - i);
+        }
     }
     k = len;
     len = RARRAY_LEN(ary);
     if (len < k && n <= numberof(idx)) {
-	for (i = 0; i < n; ++i) {
-	    if (rnds[i] >= len) return rb_ary_new_capa(0);
-	}
+        for (i = 0; i < n; ++i) {
+            if (rnds[i] >= len) return rb_ary_new_capa(0);
+        }
     }
     if (n > len) n = len;
     switch (n) {
       case 0:
-	return rb_ary_new_capa(0);
+        return rb_ary_new_capa(0);
       case 1:
-	i = rnds[0];
-	return rb_ary_new_from_args(1, RARRAY_AREF(ary, i));
+        i = rnds[0];
+        return rb_ary_new_from_args(1, RARRAY_AREF(ary, i));
       case 2:
-	i = rnds[0];
-	j = rnds[1];
-	if (j >= i) j++;
-	return rb_ary_new_from_args(2, RARRAY_AREF(ary, i), RARRAY_AREF(ary, j));
+        i = rnds[0];
+        j = rnds[1];
+        if (j >= i) j++;
+        return rb_ary_new_from_args(2, RARRAY_AREF(ary, i), RARRAY_AREF(ary, j));
       case 3:
-	i = rnds[0];
-	j = rnds[1];
-	k = rnds[2];
-	{
-	    long l = j, g = i;
-	    if (j >= i) l = i, g = ++j;
-	    if (k >= l && (++k >= g)) ++k;
-	}
-	return rb_ary_new_from_args(3, RARRAY_AREF(ary, i), RARRAY_AREF(ary, j), RARRAY_AREF(ary, k));
+        i = rnds[0];
+        j = rnds[1];
+        k = rnds[2];
+        {
+            long l = j, g = i;
+            if (j >= i) l = i, g = ++j;
+            if (k >= l && (++k >= g)) ++k;
+        }
+        return rb_ary_new_from_args(3, RARRAY_AREF(ary, i), RARRAY_AREF(ary, j), RARRAY_AREF(ary, k));
     }
     memo_threshold =
-	len < 2560 ? len / 128 :
-	len < 5120 ? len / 64 :
-	len < 10240 ? len / 32 :
-	len / 16;
+        len < 2560 ? len / 128 :
+        len < 5120 ? len / 64 :
+        len < 10240 ? len / 32 :
+        len / 16;
     if (n <= numberof(idx)) {
-	long sorted[numberof(idx)];
-	sorted[0] = idx[0] = rnds[0];
-	for (i=1; i<n; i++) {
-	    k = rnds[i];
-	    for (j = 0; j < i; ++j) {
-		if (k < sorted[j]) break;
-		++k;
-	    }
-	    memmove(&sorted[j+1], &sorted[j], sizeof(sorted[0])*(i-j));
-	    sorted[j] = idx[i] = k;
-	}
-	result = rb_ary_new_capa(n);
-        RARRAY_PTR_USE_TRANSIENT(result, ptr_result, {
-	    for (i=0; i<n; i++) {
-		ptr_result[i] = RARRAY_AREF(ary, idx[i]);
-	    }
-	});
+        long sorted[numberof(idx)];
+        sorted[0] = idx[0] = rnds[0];
+        for (i=1; i<n; i++) {
+            k = rnds[i];
+            for (j = 0; j < i; ++j) {
+                if (k < sorted[j]) break;
+                ++k;
+            }
+            memmove(&sorted[j+1], &sorted[j], sizeof(sorted[0])*(i-j));
+            sorted[j] = idx[i] = k;
+        }
+        result = rb_ary_new_capa(n);
+        RARRAY_PTR_USE(result, ptr_result, {
+            for (i=0; i<n; i++) {
+                ptr_result[i] = RARRAY_AREF(ary, idx[i]);
+            }
+        });
     }
     else if (n <= memo_threshold / 2) {
-	long max_idx = 0;
-#undef RUBY_UNTYPED_DATA_WARNING
-#define RUBY_UNTYPED_DATA_WARNING 0
-	VALUE vmemo = Data_Wrap_Struct(0, 0, st_free_table, 0);
-	st_table *memo = st_init_numtable_with_size(n);
-	DATA_PTR(vmemo) = memo;
-	result = rb_ary_new_capa(n);
-	RARRAY_PTR_USE(result, ptr_result, {
-	    for (i=0; i<n; i++) {
-		long r = RAND_UPTO(len-i) + i;
-		ptr_result[i] = r;
-		if (r > max_idx) max_idx = r;
-	    }
-	    len = RARRAY_LEN(ary);
-	    if (len <= max_idx) n = 0;
-	    else if (n > len) n = len;
-            RARRAY_PTR_USE_TRANSIENT(ary, ptr_ary, {
-		for (i=0; i<n; i++) {
-		    long j2 = j = ptr_result[i];
-		    long i2 = i;
-		    st_data_t value;
-		    if (st_lookup(memo, (st_data_t)i, &value)) i2 = (long)value;
-		    if (st_lookup(memo, (st_data_t)j, &value)) j2 = (long)value;
-		    st_insert(memo, (st_data_t)j, (st_data_t)i2);
-		    ptr_result[i] = ptr_ary[j2];
-		}
-	    });
-	});
-	DATA_PTR(vmemo) = 0;
-	st_free_table(memo);
+        long max_idx = 0;
+        VALUE vmemo = TypedData_Wrap_Struct(0, &ary_sample_memo_type, 0);
+        st_table *memo = st_init_numtable_with_size(n);
+        RTYPEDDATA_DATA(vmemo) = memo;
+        result = rb_ary_new_capa(n);
+        RARRAY_PTR_USE(result, ptr_result, {
+            for (i=0; i<n; i++) {
+                long r = RAND_UPTO(len-i) + i;
+                ptr_result[i] = r;
+                if (r > max_idx) max_idx = r;
+            }
+            len = RARRAY_LEN(ary);
+            if (len <= max_idx) n = 0;
+            else if (n > len) n = len;
+            RARRAY_PTR_USE(ary, ptr_ary, {
+                for (i=0; i<n; i++) {
+                    long j2 = j = ptr_result[i];
+                    long i2 = i;
+                    st_data_t value;
+                    if (st_lookup(memo, (st_data_t)i, &value)) i2 = (long)value;
+                    if (st_lookup(memo, (st_data_t)j, &value)) j2 = (long)value;
+                    st_insert(memo, (st_data_t)j, (st_data_t)i2);
+                    ptr_result[i] = ptr_ary[j2];
+                }
+            });
+        });
+        RTYPEDDATA_DATA(vmemo) = 0;
+        st_free_table(memo);
+        RB_GC_GUARD(vmemo);
     }
     else {
-	result = rb_ary_dup(ary);
-	RBASIC_CLEAR_CLASS(result);
-	RB_GC_GUARD(ary);
-	RARRAY_PTR_USE(result, ptr_result, {
-	    for (i=0; i<n; i++) {
-		j = RAND_UPTO(len-i) + i;
-		nv = ptr_result[j];
-		ptr_result[j] = ptr_result[i];
-		ptr_result[i] = nv;
-	    }
-	});
-	RBASIC_SET_CLASS_RAW(result, rb_cArray);
+        result = rb_ary_dup(ary);
+        RBASIC_CLEAR_CLASS(result);
+        RB_GC_GUARD(ary);
+        RARRAY_PTR_USE(result, ptr_result, {
+            for (i=0; i<n; i++) {
+                j = RAND_UPTO(len-i) + i;
+                nv = ptr_result[j];
+                ptr_result[j] = ptr_result[i];
+                ptr_result[i] = nv;
+            }
+        });
+        RBASIC_SET_CLASS_RAW(result, rb_cArray);
     }
     ARY_SET_LEN(result, n);
 
@@ -6809,6 +6992,12 @@ ary_sample(rb_execution_context_t *ec, VALUE ary, VALUE randgen, VALUE nv, VALUE
 }
 
 static VALUE
+ary_sized_alloc(rb_execution_context_t *ec, VALUE self)
+{
+    return rb_ary_new2(RARRAY_LEN(self));
+}
+
+static VALUE
 ary_sample0(rb_execution_context_t *ec, VALUE ary)
 {
     return ary_sample(ec, ary, rb_cRandom, Qfalse, Qfalse);
@@ -6820,7 +7009,7 @@ rb_ary_cycle_size(VALUE self, VALUE args, VALUE eobj)
     long mul;
     VALUE n = Qnil;
     if (args && (RARRAY_LEN(args) > 0)) {
-	n = RARRAY_AREF(args, 0);
+        n = RARRAY_AREF(args, 0);
     }
     if (RARRAY_LEN(self) == 0) return INT2FIX(0);
     if (NIL_P(n)) return DBL2NUM(HUGE_VAL);
@@ -6832,36 +7021,36 @@ rb_ary_cycle_size(VALUE self, VALUE args, VALUE eobj)
 
 /*
  *  call-seq:
- *    array.cycle {|element| ... } -> nil
- *    array.cycle(count) {|element| ... } -> nil
- *    array.cycle -> new_enumerator
- *    array.cycle(count) -> new_enumerator
+ *    cycle(count = nil) {|element| ... } -> nil
+ *    cycle(count = nil) -> new_enumerator
  *
- *  When called with positive \Integer argument +count+ and a block,
- *  calls the block with each element, then does so again,
+ *  With a block given, may call the block, depending on the value of argument +count+;
+ *  +count+ must be an
+ *  {integer-convertible object}[rdoc-ref:implicit_conversion.rdoc@Integer-Convertible+Objects],
+ *  or +nil+.
+ *
+ *  When +count+ is positive,
+ *  calls the block with each element, then does so repeatedly,
  *  until it has done so +count+ times; returns +nil+:
  *
  *    output = []
  *    [0, 1].cycle(2) {|element| output.push(element) } # => nil
  *    output # => [0, 1, 0, 1]
  *
- *  If +count+ is zero or negative, does not call the block:
+ *  When +count+ is zero or negative, does not call the block:
  *
- *    [0, 1].cycle(0) {|element| fail 'Cannot happen' } # => nil
+ *    [0, 1].cycle(0) {|element| fail 'Cannot happen' }  # => nil
  *    [0, 1].cycle(-1) {|element| fail 'Cannot happen' } # => nil
  *
- *  When a block is given, and argument is omitted or +nil+, cycles forever:
+ *  When +count+ is +nil+, cycles forever:
  *
  *    # Prints 0 and 1 forever.
  *    [0, 1].cycle {|element| puts element }
  *    [0, 1].cycle(nil) {|element| puts element }
  *
- *  When no block is given, returns a new \Enumerator:
- *
- *    [0, 1].cycle(2) # => #<Enumerator: [0, 1]:cycle(2)>
- *    [0, 1].cycle # => # => #<Enumerator: [0, 1]:cycle>
- *    [0, 1].cycle.first(5) # => [0, 1, 0, 1, 0]
+ *  With no block given, returns a new Enumerator.
  *
+ *  Related: see {Methods for Iterating}[rdoc-ref:Array@Methods+for+Iterating].
  */
 static VALUE
 rb_ary_cycle(int argc, VALUE *argv, VALUE ary)
@@ -6887,9 +7076,6 @@ rb_ary_cycle(int argc, VALUE *argv, VALUE ary)
     return Qnil;
 }
 
-#define tmpary(n) rb_ary_tmp_new(n)
-#define tmpary_discard(a) (ary_discard(a), RBASIC_SET_CLASS_RAW(a, rb_cArray))
-
 /*
  * Build a ruby array of the corresponding values and yield it to the
  * associated block.
@@ -6925,32 +7111,32 @@ permute0(const long n, const long r, long *const p, char *const used, const VALU
     long i = 0, index = 0;
 
     for (;;) {
-	const char *const unused = memchr(&used[i], 0, n-i);
-	if (!unused) {
-	    if (!index) break;
-	    i = p[--index];                /* pop index */
-	    used[i++] = 0;                 /* index unused */
-	}
-	else {
-	    i = unused - used;
-	    p[index] = i;
-	    used[i] = 1;                   /* mark index used */
-	    ++index;
-	    if (index < r-1) {             /* if not done yet */
-		p[index] = i = 0;
-		continue;
-	    }
-	    for (i = 0; i < n; ++i) {
-		if (used[i]) continue;
-		p[index] = i;
-		if (!yield_indexed_values(values, r, p)) {
-		    rb_raise(rb_eRuntimeError, "permute reentered");
-		}
-	    }
-	    i = p[--index];                /* pop index */
-	    used[i] = 0;                   /* index unused */
-	    p[index] = ++i;
-	}
+        const char *const unused = memchr(&used[i], 0, n-i);
+        if (!unused) {
+            if (!index) break;
+            i = p[--index];                /* pop index */
+            used[i++] = 0;                 /* index unused */
+        }
+        else {
+            i = unused - used;
+            p[index] = i;
+            used[i] = 1;                   /* mark index used */
+            ++index;
+            if (index < r-1) {             /* if not done yet */
+                p[index] = i = 0;
+                continue;
+            }
+            for (i = 0; i < n; ++i) {
+                if (used[i]) continue;
+                p[index] = i;
+                if (!yield_indexed_values(values, r, p)) {
+                    rb_raise(rb_eRuntimeError, "permute reentered");
+                }
+            }
+            i = p[--index];                /* pop index */
+            used[i] = 0;                   /* index unused */
+            p[index] = ++i;
+        }
     }
 }
 
@@ -6963,14 +7149,14 @@ descending_factorial(long from, long how_many)
 {
     VALUE cnt;
     if (how_many > 0) {
-	cnt = LONG2FIX(from);
-	while (--how_many > 0) {
-	    long v = --from;
-	    cnt = rb_int_mul(cnt, LONG2FIX(v));
-	}
+        cnt = LONG2FIX(from);
+        while (--how_many > 0) {
+            long v = --from;
+            cnt = rb_int_mul(cnt, LONG2FIX(v));
+        }
     }
     else {
-	cnt = LONG2FIX(how_many == 0);
+        cnt = LONG2FIX(how_many == 0);
     }
     return cnt;
 }
@@ -6981,18 +7167,18 @@ binomial_coefficient(long comb, long size)
     VALUE r;
     long i;
     if (comb > size-comb) {
-	comb = size-comb;
+        comb = size-comb;
     }
     if (comb < 0) {
-	return LONG2FIX(0);
+        return LONG2FIX(0);
     }
     else if (comb == 0) {
-	return LONG2FIX(1);
+        return LONG2FIX(1);
     }
     r = LONG2FIX(size);
     for (i = 1; i < comb; ++i) {
-	r = rb_int_mul(r, LONG2FIX(size - i));
-	r = rb_int_idiv(r, LONG2FIX(i + 1));
+        r = rb_int_mul(r, LONG2FIX(size - i));
+        r = rb_int_idiv(r, LONG2FIX(i + 1));
     }
     return r;
 }
@@ -7008,82 +7194,44 @@ rb_ary_permutation_size(VALUE ary, VALUE args, VALUE eobj)
 
 /*
  *  call-seq:
- *    array.permutation {|element| ... } -> self
- *    array.permutation(n) {|element| ... } -> self
- *    array.permutation -> new_enumerator
- *    array.permutation(n) -> new_enumerator
- *
- *  When invoked with a block, yield all permutations of elements of +self+; returns +self+.
- *  The order of permutations is indeterminate.
- *
- *  When a block and an in-range positive \Integer argument +n+ (<tt>0 < n <= self.size</tt>)
- *  are given, calls the block with all +n+-tuple permutations of +self+.
- *
- *  Example:
- *
- *    a = [0, 1, 2]
- *    a.permutation(2) {|permutation| p permutation }
- *
- *  Output:
+ *    permutation(count = self.size) {|permutation| ... } -> self
+ *    permutation(count = self.size) -> new_enumerator
  *
- *    [0, 1]
- *    [0, 2]
- *    [1, 0]
- *    [1, 2]
- *    [2, 0]
- *    [2, 1]
+ *  Iterates over permutations of the elements of +self+;
+ *  the order of permutations is indeterminate.
  *
- *  Another example:
+ *  With a block and an in-range positive integer argument +count+ (<tt>0 < count <= self.size</tt>) given,
+ *  calls the block with each permutation of +self+ of size +count+;
+ *  returns +self+:
  *
  *    a = [0, 1, 2]
- *    a.permutation(3) {|permutation| p permutation }
- *
- *  Output:
+ *    perms = []
+ *    a.permutation(1) {|perm| perms.push(perm) }
+ *    perms # => [[0], [1], [2]]
  *
- *    [0, 1, 2]
- *    [0, 2, 1]
- *    [1, 0, 2]
- *    [1, 2, 0]
- *    [2, 0, 1]
- *    [2, 1, 0]
+ *    perms = []
+ *    a.permutation(2) {|perm| perms.push(perm) }
+ *    perms # => [[0, 1], [0, 2], [1, 0], [1, 2], [2, 0], [2, 1]]
  *
- *  When +n+ is zero, calls the block once with a new empty \Array:
+ *    perms = []
+ *    a.permutation(3) {|perm| perms.push(perm) }
+ *    perms # => [[0, 1, 2], [0, 2, 1], [1, 0, 2], [1, 2, 0], [2, 0, 1], [2, 1, 0]]
  *
- *    a = [0, 1, 2]
- *    a.permutation(0) {|permutation| p permutation }
- *
- *  Output:
+ *  When +count+ is zero, calls the block once with a new empty array:
  *
- *    []
+ *    perms = []
+ *    a.permutation(0) {|perm| perms.push(perm) }
+ *    perms # => [[]]
  *
- *  When +n+ is out of range (negative or larger than <tt>self.size</tt>),
+ *  When +count+ is out of range (negative or larger than <tt>self.size</tt>),
  *  does not call the block:
  *
- *    a = [0, 1, 2]
  *    a.permutation(-1) {|permutation| fail 'Cannot happen' }
  *    a.permutation(4) {|permutation| fail 'Cannot happen' }
  *
- *  When a block given but no argument,
- *  behaves the same as <tt>a.permutation(a.size)</tt>:
- *
- *    a = [0, 1, 2]
- *    a.permutation {|permutation| p permutation }
- *
- *  Output:
- *
- *    [0, 1, 2]
- *    [0, 2, 1]
- *    [1, 0, 2]
- *    [1, 2, 0]
- *    [2, 0, 1]
- *    [2, 1, 0]
- *
- *  Returns a new \Enumerator if no block given:
- *
- *    a = [0, 1, 2]
- *    a.permutation # => #<Enumerator: [0, 1, 2]:permutation>
- *    a.permutation(2) # => #<Enumerator: [0, 1, 2]:permutation(2)>
+ *  With no block given, returns a new Enumerator.
  *
+ *  Related: {Methods for Iterating}[rdoc-ref:Array@Methods+for+Iterating].
  */
 
 static VALUE
@@ -7098,28 +7246,28 @@ rb_ary_permutation(int argc, VALUE *argv, VALUE ary)
         r = NUM2LONG(argv[0]);            /* Permutation size from argument */
 
     if (r < 0 || n < r) {
-	/* no permutations: yield nothing */
+        /* no permutations: yield nothing */
     }
     else if (r == 0) { /* exactly one permutation: the zero-length array */
-	rb_yield(rb_ary_new2(0));
+        rb_yield(rb_ary_new2(0));
     }
     else if (r == 1) { /* this is a special, easy case */
-	for (i = 0; i < RARRAY_LEN(ary); i++) {
-	    rb_yield(rb_ary_new3(1, RARRAY_AREF(ary, i)));
-	}
+        for (i = 0; i < RARRAY_LEN(ary); i++) {
+            rb_yield(rb_ary_new3(1, RARRAY_AREF(ary, i)));
+        }
     }
     else {             /* this is the general case */
-	volatile VALUE t0;
-	long *p = ALLOCV_N(long, t0, r+roomof(n, sizeof(long)));
-	char *used = (char*)(p + r);
-	VALUE ary0 = ary_make_shared_copy(ary); /* private defensive copy of ary */
-	RBASIC_CLEAR_CLASS(ary0);
+        volatile VALUE t0;
+        long *p = ALLOCV_N(long, t0, r+roomof(n, sizeof(long)));
+        char *used = (char*)(p + r);
+        VALUE ary0 = ary_make_shared_copy(ary); /* private defensive copy of ary */
+        RBASIC_CLEAR_CLASS(ary0);
 
-	MEMZERO(used, char, n); /* initialize array */
+        MEMZERO(used, char, n); /* initialize array */
 
-	permute0(n, r, p, used, ary0); /* compute and yield permutations */
-	ALLOCV_END(t0);
-	RBASIC_SET_CLASS_RAW(ary0, rb_cArray);
+        permute0(n, r, p, used, ary0); /* compute and yield permutations */
+        ALLOCV_END(t0);
+        RBASIC_SET_CLASS_RAW(ary0, rb_cArray);
     }
     return ary;
 }
@@ -7132,16 +7280,16 @@ combinate0(const long len, const long n, long *const stack, const VALUE values)
     MEMZERO(stack+1, long, n);
     stack[0] = -1;
     for (;;) {
-	for (lev++; lev < n; lev++) {
-	    stack[lev+1] = stack[lev]+1;
-	}
-	if (!yield_indexed_values(values, n, stack+1)) {
-	    rb_raise(rb_eRuntimeError, "combination reentered");
-	}
-	do {
-	    if (lev == 0) return;
-	    stack[lev--]++;
-	} while (stack[lev+1]+n == len+lev+1);
+        for (lev++; lev < n; lev++) {
+            stack[lev+1] = stack[lev]+1;
+        }
+        if (!yield_indexed_values(values, n, stack+1)) {
+            rb_raise(rb_eRuntimeError, "combination reentered");
+        }
+        do {
+            if (lev == 0) return;
+            stack[lev--]++;
+        } while (stack[lev+1]+n == len+lev+1);
     }
 }
 
@@ -7156,56 +7304,46 @@ rb_ary_combination_size(VALUE ary, VALUE args, VALUE eobj)
 
 /*
  *  call-seq:
- *    array.combination(n) {|element| ... } -> self
- *    array.combination(n) -> new_enumerator
+ *    combination(count) {|element| ... } -> self
+ *    combination(count) -> new_enumerator
  *
- *  Calls the block, if given, with combinations of elements of +self+;
- *  returns +self+. The order of combinations is indeterminate.
- *
- *  When a block and an in-range positive \Integer argument +n+ (<tt>0 < n <= self.size</tt>)
- *  are given, calls the block with all +n+-tuple combinations of +self+.
- *
- *  Example:
+ *  When a block and a positive
+ *  {integer-convertible object}[rdoc-ref:implicit_conversion.rdoc@Integer-Convertible+Objects]
+ *  argument +count+ (<tt>0 < count <= self.size</tt>)
+ *  are given, calls the block with each combination of +self+ of size +count+;
+ *  returns +self+:
  *
- *    a = [0, 1, 2]
- *    a.combination(2) {|combination| p combination }
+ *    a = %w[a b c]                                   # => ["a", "b", "c"]
+ *    a.combination(2) {|combination| p combination } # => ["a", "b", "c"]
  *
  *  Output:
  *
- *    [0, 1]
- *    [0, 2]
- *    [1, 2]
- *
- *  Another example:
- *
- *    a = [0, 1, 2]
- *    a.combination(3) {|combination| p combination }
- *
- *  Output:
+ *    ["a", "b"]
+ *    ["a", "c"]
+ *    ["b", "c"]
  *
- *    [0, 1, 2]
+ *  The order of the yielded combinations is not guaranteed.
  *
- *  When +n+ is zero, calls the block once with a new empty \Array:
+ *  When +count+ is zero, calls the block once with a new empty array:
  *
- *    a = [0, 1, 2]
- *    a1 = a.combination(0) {|combination| p combination }
+ *    a.combination(0) {|combination| p combination }
+ *    [].combination(0) {|combination| p combination }
  *
  *  Output:
  *
  *    []
+ *    []
  *
- *  When +n+ is out of range (negative or larger than <tt>self.size</tt>),
+ *  When +count+ is negative or larger than +self.size+ and +self+ is non-empty,
  *  does not call the block:
  *
- *    a = [0, 1, 2]
- *    a.combination(-1) {|combination| fail 'Cannot happen' }
- *    a.combination(4) {|combination| fail 'Cannot happen' }
- *
- *  Returns a new \Enumerator if no block given:
+ *    a.combination(-1) {|combination| fail 'Cannot happen' } # => ["a", "b", "c"]
+ *    a.combination(4)  {|combination| fail 'Cannot happen' } # => ["a", "b", "c"]
  *
- *    a = [0, 1, 2]
- *    a.combination(2) # => #<Enumerator: [0, 1, 2]:combination(2)>
+ *  With no block given, returns a new Enumerator.
  *
+ *  Related: Array#permutation;
+ *  see also {Methods for Iterating}[rdoc-ref:Array@Methods+for+Iterating].
  */
 
 static VALUE
@@ -7217,25 +7355,25 @@ rb_ary_combination(VALUE ary, VALUE num)
     RETURN_SIZED_ENUMERATOR(ary, 1, &num, rb_ary_combination_size);
     len = RARRAY_LEN(ary);
     if (n < 0 || len < n) {
-	/* yield nothing */
+        /* yield nothing */
     }
     else if (n == 0) {
-	rb_yield(rb_ary_new2(0));
+        rb_yield(rb_ary_new2(0));
     }
     else if (n == 1) {
-	for (i = 0; i < RARRAY_LEN(ary); i++) {
-	    rb_yield(rb_ary_new3(1, RARRAY_AREF(ary, i)));
-	}
+        for (i = 0; i < RARRAY_LEN(ary); i++) {
+            rb_yield(rb_ary_new3(1, RARRAY_AREF(ary, i)));
+        }
     }
     else {
-	VALUE ary0 = ary_make_shared_copy(ary); /* private defensive copy of ary */
-	volatile VALUE t0;
-	long *stack = ALLOCV_N(long, t0, n+1);
+        VALUE ary0 = ary_make_shared_copy(ary); /* private defensive copy of ary */
+        volatile VALUE t0;
+        long *stack = ALLOCV_N(long, t0, n+1);
 
-	RBASIC_CLEAR_CLASS(ary0);
-	combinate0(len, n, stack, ary0);
-	ALLOCV_END(t0);
-	RBASIC_SET_CLASS_RAW(ary0, rb_cArray);
+        RBASIC_CLEAR_CLASS(ary0);
+        combinate0(len, n, stack, ary0);
+        ALLOCV_END(t0);
+        RBASIC_SET_CLASS_RAW(ary0, rb_cArray);
     }
     return ary;
 }
@@ -7259,19 +7397,19 @@ rpermute0(const long n, const long r, long *const p, const VALUE values)
 
     p[index] = i;
     for (;;) {
-	if (++index < r-1) {
-	    p[index] = i = 0;
-	    continue;
-	}
-	for (i = 0; i < n; ++i) {
-	    p[index] = i;
-	    if (!yield_indexed_values(values, r, p)) {
-		rb_raise(rb_eRuntimeError, "repeated permute reentered");
-	    }
-	}
-	do {
-	    if (index <= 0) return;
-	} while ((i = ++p[--index]) >= n);
+        if (++index < r-1) {
+            p[index] = i = 0;
+            continue;
+        }
+        for (i = 0; i < n; ++i) {
+            p[index] = i;
+            if (!yield_indexed_values(values, r, p)) {
+                rb_raise(rb_eRuntimeError, "repeated permute reentered");
+            }
+        }
+        do {
+            if (index <= 0) return;
+        } while ((i = ++p[--index]) >= n);
     }
 }
 
@@ -7282,78 +7420,51 @@ rb_ary_repeated_permutation_size(VALUE ary, VALUE args, VALUE eobj)
     long k = NUM2LONG(RARRAY_AREF(args, 0));
 
     if (k < 0) {
-	return LONG2FIX(0);
+        return LONG2FIX(0);
     }
     if (n <= 0) {
-	return LONG2FIX(!k);
+        return LONG2FIX(!k);
     }
     return rb_int_positive_pow(n, (unsigned long)k);
 }
 
 /*
  *  call-seq:
- *    array.repeated_permutation(n) {|permutation| ... } -> self
- *    array.repeated_permutation(n) -> new_enumerator
+ *    repeated_permutation(size) {|permutation| ... } -> self
+ *    repeated_permutation(size) -> new_enumerator
  *
- *  Calls the block with each repeated permutation of length +n+ of the elements of +self+;
- *  each permutation is an \Array;
+ *  With a block given, calls the block with each repeated permutation of length +size+
+ *  of the elements of +self+;
+ *  each permutation is an array;
  *  returns +self+. The order of the permutations is indeterminate.
  *
- *  When a block and a positive \Integer argument +n+ are given, calls the block with each
- *  +n+-tuple repeated permutation of the elements of +self+.
- *  The number of permutations is <tt>self.size**n</tt>.
- *
- *  +n+ = 1:
- *
- *    a = [0, 1, 2]
- *    a.repeated_permutation(1) {|permutation| p permutation }
- *
- *  Output:
- *
- *    [0]
- *    [1]
- *    [2]
+ *  If a positive integer argument +size+ is given,
+ *  calls the block with each +size+-tuple repeated permutation of the elements of +self+.
+ *  The number of permutations is <tt>self.size**size</tt>.
  *
- *  +n+ = 2:
+ *  Examples:
  *
- *    a.repeated_permutation(2) {|permutation| p permutation }
+ *  - +size+ is 1:
  *
- *  Output:
+ *      p = []
+ *      [0, 1, 2].repeated_permutation(1) {|permutation| p.push(permutation) }
+ *      p # => [[0], [1], [2]]
  *
- *    [0, 0]
- *    [0, 1]
- *    [0, 2]
- *    [1, 0]
- *    [1, 1]
- *    [1, 2]
- *    [2, 0]
- *    [2, 1]
- *    [2, 2]
+ *  - +size+ is 2:
  *
- *  If +n+ is zero, calls the block once with an empty \Array.
+ *      p = []
+ *      [0, 1, 2].repeated_permutation(2) {|permutation| p.push(permutation) }
+ *      p # => [[0, 0], [0, 1], [0, 2], [1, 0], [1, 1], [1, 2], [2, 0], [2, 1], [2, 2]]
  *
- *  If +n+ is negative, does not call the block:
+ *  If +size+ is zero, calls the block once with an empty array.
  *
- *    a.repeated_permutation(-1) {|permutation| fail 'Cannot happen' }
+ *  If +size+ is negative, does not call the block:
  *
- *  Returns a new \Enumerator if no block given:
- *
- *    a = [0, 1, 2]
- *    a.repeated_permutation(2) # => #<Enumerator: [0, 1, 2]:permutation(2)>
+ *    [0, 1, 2].repeated_permutation(-1) {|permutation| fail 'Cannot happen' }
  *
- *  Using Enumerators, it's convenient to show the permutations and counts
- *  for some values of +n+:
- *
- *    e = a.repeated_permutation(0)
- *    e.size # => 1
- *    e.to_a # => [[]]
- *    e = a.repeated_permutation(1)
- *    e.size # => 3
- *    e.to_a # => [[0], [1], [2]]
- *    e = a.repeated_permutation(2)
- *    e.size # => 9
- *    e.to_a # => [[0, 0], [0, 1], [0, 2], [1, 0], [1, 1], [1, 2], [2, 0], [2, 1], [2, 2]]
+ *  With no block given, returns a new Enumerator.
  *
+ *  Related: see {Methods for Combining}[rdoc-ref:Array@Methods+for+Combining].
  */
 static VALUE
 rb_ary_repeated_permutation(VALUE ary, VALUE num)
@@ -7365,25 +7476,25 @@ rb_ary_repeated_permutation(VALUE ary, VALUE num)
     r = NUM2LONG(num);                    /* Permutation size from argument */
 
     if (r < 0) {
-	/* no permutations: yield nothing */
+        /* no permutations: yield nothing */
     }
     else if (r == 0) { /* exactly one permutation: the zero-length array */
-	rb_yield(rb_ary_new2(0));
+        rb_yield(rb_ary_new2(0));
     }
     else if (r == 1) { /* this is a special, easy case */
-	for (i = 0; i < RARRAY_LEN(ary); i++) {
-	    rb_yield(rb_ary_new3(1, RARRAY_AREF(ary, i)));
-	}
+        for (i = 0; i < RARRAY_LEN(ary); i++) {
+            rb_yield(rb_ary_new3(1, RARRAY_AREF(ary, i)));
+        }
     }
     else {             /* this is the general case */
-	volatile VALUE t0;
-	long *p = ALLOCV_N(long, t0, r);
-	VALUE ary0 = ary_make_shared_copy(ary); /* private defensive copy of ary */
-	RBASIC_CLEAR_CLASS(ary0);
+        volatile VALUE t0;
+        long *p = ALLOCV_N(long, t0, r);
+        VALUE ary0 = ary_make_shared_copy(ary); /* private defensive copy of ary */
+        RBASIC_CLEAR_CLASS(ary0);
 
-	rpermute0(n, r, p, ary0); /* compute and yield repeated permutations */
-	ALLOCV_END(t0);
-	RBASIC_SET_CLASS_RAW(ary0, rb_cArray);
+        rpermute0(n, r, p, ary0); /* compute and yield repeated permutations */
+        ALLOCV_END(t0);
+        RBASIC_SET_CLASS_RAW(ary0, rb_cArray);
     }
     return ary;
 }
@@ -7395,19 +7506,19 @@ rcombinate0(const long n, const long r, long *const p, const long rest, const VA
 
     p[index] = i;
     for (;;) {
-	if (++index < r-1) {
-	    p[index] = i;
-	    continue;
-	}
-	for (; i < n; ++i) {
-	    p[index] = i;
-	    if (!yield_indexed_values(values, r, p)) {
-		rb_raise(rb_eRuntimeError, "repeated combination reentered");
-	    }
-	}
-	do {
-	    if (index <= 0) return;
-	} while ((i = ++p[--index]) >= n);
+        if (++index < r-1) {
+            p[index] = i;
+            continue;
+        }
+        for (; i < n; ++i) {
+            p[index] = i;
+            if (!yield_indexed_values(values, r, p)) {
+                rb_raise(rb_eRuntimeError, "repeated combination reentered");
+            }
+        }
+        do {
+            if (index <= 0) return;
+        } while ((i = ++p[--index]) >= n);
     }
 }
 
@@ -7417,72 +7528,48 @@ rb_ary_repeated_combination_size(VALUE ary, VALUE args, VALUE eobj)
     long n = RARRAY_LEN(ary);
     long k = NUM2LONG(RARRAY_AREF(args, 0));
     if (k == 0) {
-	return LONG2FIX(1);
+        return LONG2FIX(1);
     }
     return binomial_coefficient(k, n + k - 1);
 }
 
 /*
  *  call-seq:
- *    array.repeated_combination(n) {|combination| ... } -> self
- *    array.repeated_combination(n) -> new_enumerator
+ *    repeated_combination(size) {|combination| ... } -> self
+ *    repeated_combination(size) -> new_enumerator
  *
- *  Calls the block with each repeated combination of length +n+ of the elements of +self+;
- *  each combination is an \Array;
+ *  With a block given, calls the block with each repeated combination of length +size+
+ *  of the elements of +self+;
+ *  each combination is an array;
  *  returns +self+. The order of the combinations is indeterminate.
  *
- *  When a block and a positive \Integer argument +n+ are given, calls the block with each
- *  +n+-tuple repeated combination of the elements of +self+.
- *  The number of combinations is <tt>(n+1)(n+2)/2</tt>.
- *
- *  +n+ = 1:
- *
- *    a = [0, 1, 2]
- *    a.repeated_combination(1) {|combination| p combination }
- *
- *  Output:
- *
- *    [0]
- *    [1]
- *    [2]
- *
- *  +n+ = 2:
+ *  If a positive integer argument +size+ is given,
+ *  calls the block with each +size+-tuple repeated combination of the elements of +self+.
+ *  The number of combinations is <tt>(size+1)(size+2)/2</tt>.
  *
- *    a.repeated_combination(2) {|combination| p combination }
- *
- *  Output:
+ *  Examples:
  *
- *    [0, 0]
- *    [0, 1]
- *    [0, 2]
- *    [1, 1]
- *    [1, 2]
- *    [2, 2]
+ *  - +size+ is 1:
  *
- *  If +n+ is zero, calls the block once with an empty \Array.
+ *      c = []
+ *      [0, 1, 2].repeated_combination(1) {|combination| c.push(combination) }
+ *      c # => [[0], [1], [2]]
  *
- *  If +n+ is negative, does not call the block:
+ *  - +size+ is 2:
  *
- *    a.repeated_combination(-1) {|combination| fail 'Cannot happen' }
+ *      c = []
+ *      [0, 1, 2].repeated_combination(2) {|combination| c.push(combination) }
+ *      c # => [[0, 0], [0, 1], [0, 2], [1, 1], [1, 2], [2, 2]]
  *
- *  Returns a new \Enumerator if no block given:
+ *  If +size+ is zero, calls the block once with an empty array.
  *
- *    a = [0, 1, 2]
- *    a.repeated_combination(2) # => #<Enumerator: [0, 1, 2]:combination(2)>
+ *  If +size+ is negative, does not call the block:
  *
- *  Using Enumerators, it's convenient to show the combinations and counts
- *  for some values of +n+:
+ *    [0, 1, 2].repeated_combination(-1) {|combination| fail 'Cannot happen' }
  *
- *    e = a.repeated_combination(0)
- *    e.size # => 1
- *    e.to_a # => [[]]
- *    e = a.repeated_combination(1)
- *    e.size # => 3
- *    e.to_a # => [[0], [1], [2]]
- *    e = a.repeated_combination(2)
- *    e.size # => 6
- *    e.to_a # => [[0, 0], [0, 1], [0, 2], [1, 1], [1, 2], [2, 2]]
+ *  With no block given, returns a new Enumerator.
  *
+ *  Related: see {Methods for Combining}[rdoc-ref:Array@Methods+for+Combining].
  */
 
 static VALUE
@@ -7494,97 +7581,90 @@ rb_ary_repeated_combination(VALUE ary, VALUE num)
     RETURN_SIZED_ENUMERATOR(ary, 1, &num, rb_ary_repeated_combination_size);   /* Return enumerator if no block */
     len = RARRAY_LEN(ary);
     if (n < 0) {
-	/* yield nothing */
+        /* yield nothing */
     }
     else if (n == 0) {
-	rb_yield(rb_ary_new2(0));
+        rb_yield(rb_ary_new2(0));
     }
     else if (n == 1) {
-	for (i = 0; i < RARRAY_LEN(ary); i++) {
-	    rb_yield(rb_ary_new3(1, RARRAY_AREF(ary, i)));
-	}
+        for (i = 0; i < RARRAY_LEN(ary); i++) {
+            rb_yield(rb_ary_new3(1, RARRAY_AREF(ary, i)));
+        }
     }
     else if (len == 0) {
-	/* yield nothing */
+        /* yield nothing */
     }
     else {
-	volatile VALUE t0;
-	long *p = ALLOCV_N(long, t0, n);
-	VALUE ary0 = ary_make_shared_copy(ary); /* private defensive copy of ary */
-	RBASIC_CLEAR_CLASS(ary0);
+        volatile VALUE t0;
+        long *p = ALLOCV_N(long, t0, n);
+        VALUE ary0 = ary_make_shared_copy(ary); /* private defensive copy of ary */
+        RBASIC_CLEAR_CLASS(ary0);
 
-	rcombinate0(len, n, p, n, ary0); /* compute and yield repeated combinations */
-	ALLOCV_END(t0);
-	RBASIC_SET_CLASS_RAW(ary0, rb_cArray);
+        rcombinate0(len, n, p, n, ary0); /* compute and yield repeated combinations */
+        ALLOCV_END(t0);
+        RBASIC_SET_CLASS_RAW(ary0, rb_cArray);
     }
     return ary;
 }
 
 /*
  *  call-seq:
- *    array.product(*other_arrays) -> new_array
- *    array.product(*other_arrays) {|combination| ... } -> self
+ *    product(*other_arrays) -> new_array
+ *    product(*other_arrays) {|combination| ... } -> self
  *
- *  Computes and returns or yields all combinations of elements from all the Arrays,
+ *  Computes all combinations of elements from all the arrays,
  *  including both +self+ and +other_arrays+:
  *
  *  - The number of combinations is the product of the sizes of all the arrays,
  *    including both +self+ and +other_arrays+.
  *  - The order of the returned combinations is indeterminate.
  *
- *  When no block is given, returns the combinations as an \Array of Arrays:
- *
- *    a = [0, 1, 2]
- *    a1 = [3, 4]
- *    a2 = [5, 6]
- *    p = a.product(a1)
- *    p.size # => 6 # a.size * a1.size
- *    p # => [[0, 3], [0, 4], [1, 3], [1, 4], [2, 3], [2, 4]]
- *    p = a.product(a1, a2)
- *    p.size # => 12 # a.size * a1.size * a2.size
- *    p # => [[0, 3, 5], [0, 3, 6], [0, 4, 5], [0, 4, 6], [1, 3, 5], [1, 3, 6], [1, 4, 5], [1, 4, 6], [2, 3, 5], [2, 3, 6], [2, 4, 5], [2, 4, 6]]
- *
- *  If any argument is an empty \Array, returns an empty \Array.
- *
- *  If no argument is given, returns an \Array of 1-element Arrays,
- *  each containing an element of +self+:
+ *  With no block given, returns the combinations as an array of arrays:
  *
- *    a.product # => [[0], [1], [2]]
+ *    p = [0, 1].product([2, 3])
+ *    # => [[0, 2], [0, 3], [1, 2], [1, 3]]
+ *    p.size # => 4
+ *    p = [0, 1].product([2, 3], [4, 5])
+ *    # => [[0, 2, 4], [0, 2, 5], [0, 3, 4], [0, 3, 5], [1, 2, 4], [1, 2, 5], [1, 3, 4], [1, 3,...
+ *    p.size # => 8
  *
- *  When a block is given, yields each combination as an \Array; returns +self+:
+ *  If +self+ or any argument is empty, returns an empty array:
  *
- *    a.product(a1) {|combination| p combination }
+ *    [].product([2, 3], [4, 5]) # => []
+ *    [0, 1].product([2, 3], []) # => []
  *
- *  Output:
+ *  If no argument is given, returns an array of 1-element arrays,
+ *  each containing an element of +self+:
  *
- *    [0, 3]
- *    [0, 4]
- *    [1, 3]
- *    [1, 4]
- *    [2, 3]
- *    [2, 4]
+ *    a.product # => [[0], [1], [2]]
  *
- *  If any argument is an empty \Array, does not call the block:
+ *  With a block given, calls the block with each combination; returns +self+:
  *
- *    a.product(a1, a2, []) {|combination| fail 'Cannot happen' }
+ *    p = []
+ *    [0, 1].product([2, 3]) {|combination| p.push(combination) }
+ *    p # => [[0, 2], [0, 3], [1, 2], [1, 3]]
  *
- *  If no argument is given, yields each element of +self+ as a 1-element \Array:
+ *  If +self+ or any argument is empty, does not call the block:
  *
- *    a.product {|combination| p combination }
+ *    [].product([2, 3], [4, 5]) {|combination| fail 'Cannot happen' }
+ *    # => []
+ *    [0, 1].product([2, 3], []) {|combination| fail 'Cannot happen' }
+ *    # => [0, 1]
  *
- *  Output:
+ *  If no argument is given, calls the block with each element of +self+ as a 1-element array:
  *
- *    [0]
- *    [1]
- *    [2]
+ *    p = []
+ *    [0, 1].product {|combination| p.push(combination) }
+ *    p # => [[0], [1]]
  *
+ *  Related: see {Methods for Combining}[rdoc-ref:Array@Methods+for+Combining].
  */
 
 static VALUE
 rb_ary_product(int argc, VALUE *argv, VALUE ary)
 {
     int n = argc+1;    /* How many arrays we're operating on */
-    volatile VALUE t0 = tmpary(n);
+    volatile VALUE t0 = rb_ary_hidden_new(n);
     volatile VALUE t1 = Qundef;
     VALUE *arrays = RARRAY_PTR(t0); /* The arrays we're computing the product of */
     int *counters = ALLOCV_N(int, t1, n); /* The current position in each one */
@@ -7605,64 +7685,64 @@ rb_ary_product(int argc, VALUE *argv, VALUE ary)
 
     /* Otherwise, allocate and fill in an array of results */
     if (rb_block_given_p()) {
-	/* Make defensive copies of arrays; exit if any is empty */
-	for (i = 0; i < n; i++) {
-	    if (RARRAY_LEN(arrays[i]) == 0) goto done;
-	    arrays[i] = ary_make_shared_copy(arrays[i]);
-	}
+        /* Make defensive copies of arrays; exit if any is empty */
+        for (i = 0; i < n; i++) {
+            if (RARRAY_LEN(arrays[i]) == 0) goto done;
+            arrays[i] = ary_make_shared_copy(arrays[i]);
+        }
     }
     else {
-	/* Compute the length of the result array; return [] if any is empty */
-	for (i = 0; i < n; i++) {
-	    long k = RARRAY_LEN(arrays[i]);
-	    if (k == 0) {
-		result = rb_ary_new2(0);
-		goto done;
-	    }
+        /* Compute the length of the result array; return [] if any is empty */
+        for (i = 0; i < n; i++) {
+            long k = RARRAY_LEN(arrays[i]);
+            if (k == 0) {
+                result = rb_ary_new2(0);
+                goto done;
+            }
             if (MUL_OVERFLOW_LONG_P(resultlen, k))
-		rb_raise(rb_eRangeError, "too big to product");
-	    resultlen *= k;
-	}
-	result = rb_ary_new2(resultlen);
+                rb_raise(rb_eRangeError, "too big to product");
+            resultlen *= k;
+        }
+        result = rb_ary_new2(resultlen);
     }
     for (;;) {
-	int m;
-	/* fill in one subarray */
-	VALUE subarray = rb_ary_new2(n);
-	for (j = 0; j < n; j++) {
-	    rb_ary_push(subarray, rb_ary_entry(arrays[j], counters[j]));
-	}
-
-	/* put it on the result array */
-	if (NIL_P(result)) {
+        int m;
+        /* fill in one subarray */
+        VALUE subarray = rb_ary_new2(n);
+        for (j = 0; j < n; j++) {
+            rb_ary_push(subarray, rb_ary_entry(arrays[j], counters[j]));
+        }
+
+        /* put it on the result array */
+        if (NIL_P(result)) {
             FL_SET(t0, RARRAY_SHARED_ROOT_FLAG);
-	    rb_yield(subarray);
+            rb_yield(subarray);
             if (!FL_TEST(t0, RARRAY_SHARED_ROOT_FLAG)) {
-		rb_raise(rb_eRuntimeError, "product reentered");
-	    }
-	    else {
+                rb_raise(rb_eRuntimeError, "product reentered");
+            }
+            else {
                 FL_UNSET(t0, RARRAY_SHARED_ROOT_FLAG);
-	    }
-	}
-	else {
-	    rb_ary_push(result, subarray);
-	}
-
-	/*
-	 * Increment the last counter.  If it overflows, reset to 0
-	 * and increment the one before it.
-	 */
-	m = n-1;
-	counters[m]++;
-	while (counters[m] == RARRAY_LEN(arrays[m])) {
-	    counters[m] = 0;
-	    /* If the first counter overflows, we are done */
-	    if (--m < 0) goto done;
-	    counters[m]++;
-	}
+            }
+        }
+        else {
+            rb_ary_push(result, subarray);
+        }
+
+        /*
+         * Increment the last counter.  If it overflows, reset to 0
+         * and increment the one before it.
+         */
+        m = n-1;
+        counters[m]++;
+        while (counters[m] == RARRAY_LEN(arrays[m])) {
+            counters[m] = 0;
+            /* If the first counter overflows, we are done */
+            if (--m < 0) goto done;
+            counters[m]++;
+        }
     }
+
 done:
-    tmpary_discard(t0);
     ALLOCV_END(t1);
 
     return NIL_P(result) ? ary : result;
@@ -7670,20 +7750,20 @@ done:
 
 /*
  *  call-seq:
- *    array.take(n) -> new_array
- *
- *  Returns a new \Array containing the first +n+ element of +self+,
- *  where +n+ is a non-negative \Integer;
- *  does not modify +self+.
+ *    take(count) -> new_array
  *
- *  Examples:
+ *  Returns a new array containing the first +count+ element of +self+
+ *  (as available);
+ *  +count+ must be a non-negative numeric;
+ *  does not modify +self+:
  *
- *    a = [0, 1, 2, 3, 4, 5]
- *    a.take(1) # => [0]
- *    a.take(2) # => [0, 1]
- *    a.take(50) # => [0, 1, 2, 3, 4, 5]
- *    a # => [0, 1, 2, 3, 4, 5]
+ *    a = ['a', 'b', 'c', 'd']
+ *    a.take(2)   # => ["a", "b"]
+ *    a.take(2.1) # => ["a", "b"]
+ *    a.take(50)  # => ["a", "b", "c", "d"]
+ *    a.take(0)   # => []
  *
+ *  Related: see {Methods for Fetching}[rdoc-ref:Array@Methods+for+Fetching].
  */
 
 static VALUE
@@ -7691,32 +7771,30 @@ rb_ary_take(VALUE obj, VALUE n)
 {
     long len = NUM2LONG(n);
     if (len < 0) {
-	rb_raise(rb_eArgError, "attempt to take negative size");
+        rb_raise(rb_eArgError, "attempt to take negative size");
     }
     return rb_ary_subseq(obj, 0, len);
 }
 
 /*
  *  call-seq:
- *    array.take_while {|element| ... } -> new_array
- *    array.take_while -> new_enumerator
- *
- *  Returns a new \Array containing zero or more leading elements of +self+;
- *  does not modify +self+.
+ *    take_while {|element| ... } -> new_array
+ *    take_while -> new_enumerator
  *
  *  With a block given, calls the block with each successive element of +self+;
- *  stops if the block returns +false+ or +nil+;
- *  returns a new \Array containing those elements for which the block returned a truthy value:
+ *  stops iterating if the block returns +false+ or +nil+;
+ *  returns a new array containing those elements for which the block returned a truthy value:
  *
  *    a = [0, 1, 2, 3, 4, 5]
  *    a.take_while {|element| element < 3 } # => [0, 1, 2]
- *    a.take_while {|element| true } # => [0, 1, 2, 3, 4, 5]
- *    a # => [0, 1, 2, 3, 4, 5]
+ *    a.take_while {|element| true }        # => [0, 1, 2, 3, 4, 5]
+ *    a.take_while {|element| false }       # => []
  *
- *  With no block given, returns a new \Enumerator:
+ *  With no block given, returns a new Enumerator.
  *
- *    [0, 1].take_while # => #<Enumerator: [0, 1]:take_while>
+ *  Does not modify +self+.
  *
+ *  Related: see {Methods for Fetching}[rdoc-ref:Array@Methods+for+Fetching].
  */
 
 static VALUE
@@ -7726,17 +7804,17 @@ rb_ary_take_while(VALUE ary)
 
     RETURN_ENUMERATOR(ary, 0, 0);
     for (i = 0; i < RARRAY_LEN(ary); i++) {
-	if (!RTEST(rb_yield(RARRAY_AREF(ary, i)))) break;
+        if (!RTEST(rb_yield(RARRAY_AREF(ary, i)))) break;
     }
     return rb_ary_take(ary, LONG2FIX(i));
 }
 
 /*
  *  call-seq:
- *    array.drop(n) -> new_array
+ *    drop(count) -> new_array
  *
- *  Returns a new \Array containing all but the first +n+ element of +self+,
- *  where +n+ is a non-negative \Integer;
+ *  Returns a new array containing all but the first +count+ element of +self+,
+ *  where +count+ is a non-negative integer;
  *  does not modify +self+.
  *
  *  Examples:
@@ -7745,7 +7823,9 @@ rb_ary_take_while(VALUE ary)
  *    a.drop(0) # => [0, 1, 2, 3, 4, 5]
  *    a.drop(1) # => [1, 2, 3, 4, 5]
  *    a.drop(2) # => [2, 3, 4, 5]
+ *    a.drop(9) # => []
  *
+ *  Related: see {Methods for Fetching}[rdoc-ref:Array@Methods+for+Fetching].
  */
 
 static VALUE
@@ -7754,7 +7834,7 @@ rb_ary_drop(VALUE ary, VALUE n)
     VALUE result;
     long pos = NUM2LONG(n);
     if (pos < 0) {
-	rb_raise(rb_eArgError, "attempt to drop negative size");
+        rb_raise(rb_eArgError, "attempt to drop negative size");
     }
 
     result = rb_ary_subseq(ary, pos, RARRAY_LEN(ary));
@@ -7764,23 +7844,20 @@ rb_ary_drop(VALUE ary, VALUE n)
 
 /*
  *  call-seq:
- *    array.drop_while {|element| ... } -> new_array
- *    array.drop_while -> new_enumerator
-
- *  Returns a new \Array containing zero or more trailing elements of +self+;
- *  does not modify +self+.
+ *    drop_while {|element| ... } -> new_array
+ *    drop_while -> new_enumerator
  *
  *  With a block given, calls the block with each successive element of +self+;
  *  stops if the block returns +false+ or +nil+;
- *  returns a new \Array _omitting_ those elements for which the block returned a truthy value:
+ *  returns a new array _omitting_ those elements for which the block returned a truthy value;
+ *  does not modify +self+:
  *
  *    a = [0, 1, 2, 3, 4, 5]
  *    a.drop_while {|element| element < 3 } # => [3, 4, 5]
  *
- *  With no block given, returns a new \Enumerator:
- *
- *    [0, 1].drop_while # => # => #<Enumerator: [0, 1]:drop_while>
+ *  With no block given, returns a new Enumerator.
  *
+ *  Related: see {Methods for Fetching}[rdoc-ref:Array@Methods+for+Fetching].
  */
 
 static VALUE
@@ -7790,42 +7867,48 @@ rb_ary_drop_while(VALUE ary)
 
     RETURN_ENUMERATOR(ary, 0, 0);
     for (i = 0; i < RARRAY_LEN(ary); i++) {
-	if (!RTEST(rb_yield(RARRAY_AREF(ary, i)))) break;
+        if (!RTEST(rb_yield(RARRAY_AREF(ary, i)))) break;
     }
     return rb_ary_drop(ary, LONG2FIX(i));
 }
 
 /*
  *  call-seq:
- *    array.any? -> true or false
- *    array.any? {|element| ... } -> true or false
- *    array.any?(obj) -> true or false
+ *    any? -> true or false
+ *    any?(object) -> true or false
+ *    any? {|element| ... } -> true or false
  *
- *  Returns +true+ if any element of +self+ meets a given criterion.
+ *  Returns whether for any element of +self+, a given criterion is satisfied.
  *
- *  With no block given and no argument, returns +true+ if +self+ has any truthy element,
- *  +false+ otherwise:
+ *  With no block and no argument, returns whether any element of +self+ is truthy:
  *
- *    [nil, 0, false].any? # => true
- *    [nil, false].any? # => false
- *    [].any? # => false
+ *    [nil, false, []].any? # => true  # Array object is truthy.
+ *    [nil, false, {}].any? # => true  # Hash object is truthy.
+ *    [nil, false, ''].any? # => true  # String object is truthy.
+ *    [nil, false].any?     # => false # Nil and false are not truthy.
  *
- *  With a block given and no argument, calls the block with each element in +self+;
- *  returns +true+ if the block returns any truthy value, +false+ otherwise:
+ *  With argument +object+ given,
+ *  returns whether <tt>object === ele</tt> for any element +ele+ in +self+:
  *
- *    [0, 1, 2].any? {|element| element > 1 } # => true
- *    [0, 1, 2].any? {|element| element > 2 } # => false
+ *    [nil, false, 0].any?(0)          # => true
+ *    [nil, false, 1].any?(0)          # => false
+ *    [nil, false, 'food'].any?(/foo/) # => true
+ *    [nil, false, 'food'].any?(/bar/) # => false
  *
- *  If argument +obj+ is given, returns +true+ if +obj+.<tt>===</tt> any element,
- *  +false+ otherwise:
+ *  With a block given,
+ *  calls the block with each element in +self+;
+ *  returns whether the block returns any truthy value:
+ *
+ *    [0, 1, 2].any? {|ele| ele < 1 } # => true
+ *    [0, 1, 2].any? {|ele| ele < 0 } # => false
+ *
+ *  With both a block and argument +object+ given,
+ *  ignores the block and uses +object+ as above.
  *
- *    ['food', 'drink'].any?(/foo/) # => true
- *    ['food', 'drink'].any?(/bar/) # => false
- *    [].any?(/foo/) # => false
- *    [0, 1, 2].any?(1) # => true
- *    [0, 1, 2].any?(3) # => false
+ *  <b>Special case</b>: returns +false+ if +self+ is empty
+ *  (regardless of any given argument or block).
  *
- *  Related: Enumerable#any?
+ *  Related: see {Methods for Querying}[rdoc-ref:Array@Methods+for+Querying].
  */
 
 static VALUE
@@ -7839,9 +7922,9 @@ rb_ary_any_p(int argc, VALUE *argv, VALUE ary)
         if (rb_block_given_p()) {
             rb_warn("given block not used");
         }
-	for (i = 0; i < RARRAY_LEN(ary); ++i) {
-	    if (RTEST(rb_funcall(argv[0], idEqq, 1, RARRAY_AREF(ary, i)))) return Qtrue;
-	}
+        for (i = 0; i < RARRAY_LEN(ary); ++i) {
+            if (RTEST(rb_funcall(argv[0], idEqq, 1, RARRAY_AREF(ary, i)))) return Qtrue;
+        }
     }
     else if (!rb_block_given_p()) {
         for (i = 0; i < len; ++i) {
@@ -7849,43 +7932,50 @@ rb_ary_any_p(int argc, VALUE *argv, VALUE ary)
         }
     }
     else {
-	for (i = 0; i < RARRAY_LEN(ary); ++i) {
-	    if (RTEST(rb_yield(RARRAY_AREF(ary, i)))) return Qtrue;
-	}
+        for (i = 0; i < RARRAY_LEN(ary); ++i) {
+            if (RTEST(rb_yield(RARRAY_AREF(ary, i)))) return Qtrue;
+        }
     }
     return Qfalse;
 }
 
 /*
  *  call-seq:
- *    array.all? -> true or false
- *    array.all? {|element| ... } -> true or false
- *    array.all?(obj) -> true or false
+ *    all? -> true or false
+ *    all?(object) -> true or false
+ *    all? {|element| ... } -> true or false
  *
- *  Returns +true+ if all elements of +self+ meet a given criterion.
+ *  Returns whether for every element of +self+,
+ *  a given criterion is satisfied.
  *
- *  With no block given and no argument, returns +true+ if +self+ contains only truthy elements,
- *  +false+ otherwise:
+ *  With no block and no argument,
+ *  returns whether every element of +self+ is truthy:
+ *
+ *    [[], {}, '', 0, 0.0, Object.new].all? # => true  # All truthy objects.
+ *    [[], {}, '', 0, 0.0, nil].all?        # => false # nil is not truthy.
+ *    [[], {}, '', 0, 0.0, false].all?      # => false # false is not truthy.
  *
- *    [0, 1, :foo].all? # => true
- *    [0, nil, 2].all? # => false
- *    [].all? # => true
+ *  With argument +object+ given, returns whether <tt>object === ele</tt>
+ *  for every element +ele+ in +self+:
  *
- *  With a block given and no argument, calls the block with each element in +self+;
- *  returns +true+ if the block returns only truthy values, +false+ otherwise:
+ *    [0, 0, 0].all?(0)                    # => true
+ *    [0, 1, 2].all?(1)                    # => false
+ *    ['food', 'fool', 'foot'].all?(/foo/) # => true
+ *    ['food', 'drink'].all?(/foo/)        # => false
  *
- *    [0, 1, 2].all? { |element| element < 3 } # => true
- *    [0, 1, 2].all? { |element| element < 2 } # => false
+ *  With a block given, calls the block with each element in +self+;
+ *  returns whether the block returns only truthy values:
  *
- *  If argument +obj+ is given, returns +true+ if <tt>obj.===</tt> every element, +false+ otherwise:
+ *    [0, 1, 2].all? { |ele| ele < 3 } # => true
+ *    [0, 1, 2].all? { |ele| ele < 2 } # => false
  *
- *    ['food', 'fool', 'foot'].all?(/foo/) # => true
- *    ['food', 'drink'].all?(/bar/) # => false
- *    [].all?(/foo/) # => true
- *    [0, 0, 0].all?(0) # => true
- *    [0, 1, 2].all?(1) # => false
+ *  With both a block and argument +object+ given,
+ *  ignores the block and uses +object+ as above.
  *
- *  Related: Enumerable#all?
+ *  <b>Special case</b>: returns +true+ if +self+ is empty
+ *  (regardless of any given argument or block).
+ *
+ *  Related: see {Methods for Querying}[rdoc-ref:Array@Methods+for+Querying].
  */
 
 static VALUE
@@ -7918,34 +8008,35 @@ rb_ary_all_p(int argc, VALUE *argv, VALUE ary)
 
 /*
  *  call-seq:
- *    array.none? -> true or false
- *    array.none? {|element| ... } -> true or false
- *    array.none?(obj) -> true or false
+ *    none? -> true or false
+ *    none?(object) -> true or false
+ *    none? {|element| ... } -> true or false
  *
- *  Returns +true+ if no element of +self+ meet a given criterion.
+ *  Returns +true+ if no element of +self+ meets a given criterion, +false+ otherwise.
  *
  *  With no block given and no argument, returns +true+ if +self+ has no truthy elements,
  *  +false+ otherwise:
  *
- *    [nil, false].none? # => true
+ *    [nil, false].none?    # => true
  *    [nil, 0, false].none? # => false
- *    [].none? # => true
+ *    [].none?              # => true
+ *
+ *  With argument +object+ given, returns +false+ if for any element +element+,
+ *  <tt>object === element</tt>; +true+ otherwise:
+ *
+ *    ['food', 'drink'].none?(/bar/) # => true
+ *    ['food', 'drink'].none?(/foo/) # => false
+ *    [].none?(/foo/)                # => true
+ *    [0, 1, 2].none?(3)             # => true
+ *    [0, 1, 2].none?(1)             # => false
  *
- *  With a block given and no argument, calls the block with each element in +self+;
+ *  With a block given, calls the block with each element in +self+;
  *  returns +true+ if the block returns no truthy value, +false+ otherwise:
  *
  *    [0, 1, 2].none? {|element| element > 3 } # => true
  *    [0, 1, 2].none? {|element| element > 1 } # => false
  *
- *  If argument +obj+ is given, returns +true+ if <tt>obj.===</tt> no element, +false+ otherwise:
- *
- *    ['food', 'drink'].none?(/bar/) # => true
- *    ['food', 'drink'].none?(/foo/) # => false
- *    [].none?(/foo/) # => true
- *    [0, 1, 2].none?(3) # => true
- *    [0, 1, 2].none?(1) # => false
- *
- *  Related: Enumerable#none?
+ *  Related: see {Methods for Querying}[rdoc-ref:Array@Methods+for+Querying].
  */
 
 static VALUE
@@ -7978,9 +8069,9 @@ rb_ary_none_p(int argc, VALUE *argv, VALUE ary)
 
 /*
  *  call-seq:
- *    array.one? -> true or false
- *    array.one? {|element| ... } -> true or false
- *    array.one?(obj) -> true or false
+ *    one? -> true or false
+ *    one? {|element| ... } -> true or false
+ *    one?(object) -> true or false
  *
  *  Returns +true+ if exactly one element of +self+ meets a given criterion.
  *
@@ -7992,14 +8083,14 @@ rb_ary_none_p(int argc, VALUE *argv, VALUE ary)
  *    [nil, nil].one? # => false
  *    [].one? # => false
  *
- *  With a block given and no argument, calls the block with each element in +self+;
+ *  With a block given, calls the block with each element in +self+;
  *  returns +true+ if the block a truthy value for exactly one element, +false+ otherwise:
  *
  *    [0, 1, 2].one? {|element| element > 0 } # => false
  *    [0, 1, 2].one? {|element| element > 1 } # => true
  *    [0, 1, 2].one? {|element| element > 2 } # => false
  *
- *  If argument +obj+ is given, returns +true+ if <tt>obj.===</tt> exactly one element,
+ *  With argument +object+ given, returns +true+ if for exactly one element +element+, <tt>object === element</tt>;
  *  +false+ otherwise:
  *
  *    [0, 1, 2].one?(0) # => true
@@ -8009,7 +8100,7 @@ rb_ary_none_p(int argc, VALUE *argv, VALUE ary)
  *    ['food', 'drink'].one?(/foo/) # => true
  *    [].one?(/foo/) # => false
  *
- *  Related: Enumerable#one?
+ *  Related: see {Methods for Querying}[rdoc-ref:Array@Methods+for+Querying].
  */
 
 static VALUE
@@ -8052,11 +8143,11 @@ rb_ary_one_p(int argc, VALUE *argv, VALUE ary)
 
 /*
  *  call-seq:
- *    array.dig(index, *identifiers) -> object
+ *    dig(index, *identifiers) -> object
  *
- *  Finds and returns the object in nested objects
- *  that is specified by +index+ and +identifiers+.
- *  The nested objects may be instances of various classes.
+ *  Finds and returns the object in nested object
+ *  specified by +index+ and +identifiers+;
+ *  the nested objects may be instances of various classes.
  *  See {Dig Methods}[rdoc-ref:dig_methods.rdoc].
  *
  *  Examples:
@@ -8067,6 +8158,7 @@ rb_ary_one_p(int argc, VALUE *argv, VALUE ary)
  *    a.dig(1, 2, 0) # => :bat
  *    a.dig(1, 2, 3) # => nil
  *
+ *  Related: see {Methods for Fetching}[rdoc-ref:Array@Methods+for+Fetching].
  */
 
 static VALUE
@@ -8084,7 +8176,7 @@ finish_exact_sum(long n, VALUE r, VALUE v, int z)
 {
     if (n != 0)
         v = rb_fix_plus(LONG2FIX(n), v);
-    if (r != Qundef) {
+    if (!UNDEF_P(r)) {
         v = rb_rational_plus(r, v);
     }
     else if (!n && z) {
@@ -8095,40 +8187,41 @@ finish_exact_sum(long n, VALUE r, VALUE v, int z)
 
 /*
  * call-seq:
- *   array.sum(init = 0) -> object
- *   array.sum(init = 0) {|element| ... } -> object
+ *   sum(init = 0) -> object
+ *   sum(init = 0) {|element| ... } -> object
  *
- *  When no block is given, returns the object equivalent to:
+ *  With no block given, returns the sum of +init+ and all elements of +self+;
+ *  for array +array+ and value +init+, equivalent to:
  *
  *    sum = init
  *    array.each {|element| sum += element }
  *    sum
  *
- *  For example, <tt>[e1, e2, e3].sum</tt> returns <tt>init + e1 + e2 + e3</tt>.
+ *  For example, <tt>[e0, e1, e2].sum</tt> returns <tt>init + e0 + e1 + e2</tt>.
  *
  *  Examples:
  *
- *    a = [0, 1, 2, 3]
- *    a.sum # => 6
- *    a.sum(100) # => 106
+ *    [0, 1, 2, 3].sum                 # => 6
+ *    [0, 1, 2, 3].sum(100)            # => 106
+ *    ['abc', 'def', 'ghi'].sum('jkl') # => "jklabcdefghi"
+ *    [[:foo, :bar], ['foo', 'bar']].sum([2, 3])
+ *    # => [2, 3, :foo, :bar, "foo", "bar"]
  *
- *  The elements need not be numeric, but must be <tt>+</tt>-compatible
- *  with each other and with +init+:
+ *  The +init+ value and elements need not be numeric, but must all be <tt>+</tt>-compatible:
  *
- *    a = ['abc', 'def', 'ghi']
- *    a.sum('jkl') # => "jklabcdefghi"
+ *    # Raises TypeError: Array can't be coerced into Integer.
+ *    [[:foo, :bar], ['foo', 'bar']].sum(2)
  *
- *  When a block is given, it is called with each element
- *  and the block's return value (instead of the element itself) is used as the addend:
+ *  With a block given, calls the block with each element of +self+;
+ *  the block's return value (instead of the element itself) is used as the addend:
  *
- *    a = ['zero', 1, :two]
- *    s = a.sum('Coerced and concatenated: ') {|element| element.to_s }
- *    s # => "Coerced and concatenated: zero1two"
+ *    ['zero', 1, :two].sum('Coerced and concatenated: ') {|element| element.to_s }
+ *    # => "Coerced and concatenated: zero1two"
  *
  *  Notes:
  *
  *  - Array#join and Array#flatten may be faster than Array#sum
- *    for an \Array of Strings or an \Array of Arrays.
+ *    for an array of strings or an array of arrays.
  *  - Array#sum method may not respect method redefinition of "+" methods such as Integer#+.
  *
  */
@@ -8149,6 +8242,12 @@ rb_ary_sum(int argc, VALUE *argv, VALUE ary)
 
     n = 0;
     r = Qundef;
+
+    if (!FIXNUM_P(v) && !RB_BIGNUM_TYPE_P(v) && !RB_TYPE_P(v, T_RATIONAL)) {
+        i = 0;
+        goto init_is_a_value;
+    }
+
     for (i = 0; i < RARRAY_LEN(ary); i++) {
         e = RARRAY_AREF(ary, i);
         if (block_given)
@@ -8163,7 +8262,7 @@ rb_ary_sum(int argc, VALUE *argv, VALUE ary)
         else if (RB_BIGNUM_TYPE_P(e))
             v = rb_big_plus(e, v);
         else if (RB_TYPE_P(e, T_RATIONAL)) {
-            if (r == Qundef)
+            if (UNDEF_P(r))
                 r = e;
             else
                 r = rb_rational_plus(r, e);
@@ -8233,6 +8332,7 @@ rb_ary_sum(int argc, VALUE *argv, VALUE ary)
     }
 
     goto has_some_value;
+    init_is_a_value:
     for (; i < RARRAY_LEN(ary); i++) {
         e = RARRAY_AREF(ary, i);
         if (block_given)
@@ -8243,6 +8343,7 @@ rb_ary_sum(int argc, VALUE *argv, VALUE ary)
     return v;
 }
 
+/* :nodoc: */
 static VALUE
 rb_ary_deconstruct(VALUE ary)
 {
@@ -8250,15 +8351,37 @@ rb_ary_deconstruct(VALUE ary)
 }
 
 /*
- *  An \Array is an ordered, integer-indexed collection of objects, called _elements_.
- *  Any object (even another array) may be an array element,
- *  and an array can contain objects of different types.
+ *  An \Array object is an ordered, integer-indexed collection of objects,
+ *  called _elements_;
+ *  the object represents
+ *  an {array data structure}[https://en.wikipedia.org/wiki/Array_(data_structure)].
+ *
+ *  An element may be any object (even another array);
+ *  elements may be any mixture of objects of different types.
+ *
+ *  Important data structures that use arrays include:
+ *
+ *  - {Coordinate vector}[https://en.wikipedia.org/wiki/Coordinate_vector].
+ *  - {Matrix}[https://en.wikipedia.org/wiki/Matrix_(mathematics)].
+ *  - {Heap}[https://en.wikipedia.org/wiki/Heap_(data_structure)].
+ *  - {Hash table}[https://en.wikipedia.org/wiki/Hash_table].
+ *  - {Deque (double-ended queue)}[https://en.wikipedia.org/wiki/Double-ended_queue].
+ *  - {Queue}[https://en.wikipedia.org/wiki/Queue_(abstract_data_type)].
+ *  - {Stack}[https://en.wikipedia.org/wiki/Stack_(abstract_data_type)].
+ *
+ *  There are also array-like data structures:
+ *
+ *  - {Associative array}[https://en.wikipedia.org/wiki/Associative_array] (see Hash).
+ *  - {Directory}[https://en.wikipedia.org/wiki/Directory_(computing)] (see Dir).
+ *  - {Environment}[https://en.wikipedia.org/wiki/Environment_variable] (see ENV).
+ *  - {Set}[https://en.wikipedia.org/wiki/Set_(abstract_data_type)] (see Set).
+ *  - {String}[https://en.wikipedia.org/wiki/String_(computer_science)] (see String).
  *
  *  == \Array Indexes
  *
  *  \Array indexing starts at 0, as in C or Java.
  *
- *  A positive index is an offset from the first element:
+ *  A non-negative index is an offset from the first element:
  *
  *  - Index 0 indicates the first element.
  *  - Index 1 indicates the second element.
@@ -8270,6 +8393,9 @@ rb_ary_deconstruct(VALUE ary)
  *  - Index -2 indicates the next-to-last element.
  *  - ...
  *
+ *
+ *  === In-Range and Out-of-Range Indexes
+ *
  *  A non-negative index is <i>in range</i> if and only if it is smaller than
  *  the size of the array.  For a 3-element array:
  *
@@ -8282,31 +8408,32 @@ rb_ary_deconstruct(VALUE ary)
  *  - Indexes -1 through -3 are in range.
  *  - Index -4 is out of range.
  *
+ *  === Effective Index
+ *
  *  Although the effective index into an array is always an integer,
- *  some methods (both within and outside of class \Array)
+ *  some methods (both within class \Array and elsewhere)
  *  accept one or more non-integer arguments that are
  *  {integer-convertible objects}[rdoc-ref:implicit_conversion.rdoc@Integer-Convertible+Objects].
  *
- *
  *  == Creating Arrays
  *
  *  You can create an \Array object explicitly with:
  *
- *  - An {array literal}[rdoc-ref:literals.rdoc@Array+Literals]:
+ *  - An {array literal}[rdoc-ref:syntax/literals.rdoc@Array+Literals]:
  *
  *      [1, 'one', :one, [2, 'two', :two]]
  *
- *  - A {%w or %W: string-array Literal}[rdoc-ref:literals.rdoc@25w+and+-25W-3A+String-Array+Literals]:
+ *  - A {%w or %W string-array Literal}[rdoc-ref:syntax/literals.rdoc@25w+and+-25W-3A+String-Array+Literals]:
  *
  *      %w[foo bar baz] # => ["foo", "bar", "baz"]
  *      %w[1 % *]       # => ["1", "%", "*"]
  *
- *  - A {%i pr %I: symbol-array Literal}[rdoc-ref:literals.rdoc@25i+and+-25I-3A+Symbol-Array+Literals]:
+ *  - A {%i or %I symbol-array Literal}[rdoc-ref:syntax/literals.rdoc@25i+and+-25I-3A+Symbol-Array+Literals]:
  *
  *      %i[foo bar baz] # => [:foo, :bar, :baz]
  *      %i[1 % *]       # => [:"1", :%, :*]
  *
- *  - \Method Kernel#Array:
+ *  - Method Kernel#Array:
  *
  *      Array(["a", "b"])             # => ["a", "b"]
  *      Array(1..5)                   # => [1, 2, 3, 4, 5]
@@ -8315,7 +8442,7 @@ rb_ary_deconstruct(VALUE ary)
  *      Array(1)                      # => [1]
  *      Array({:a => "a", :b => "b"}) # => [[:a, "a"], [:b, "b"]]
  *
- *  - \Method Array.new:
+ *  - Method Array.new:
  *
  *      Array.new               # => []
  *      Array.new(3)            # => [nil, nil, nil]
@@ -8370,8 +8497,8 @@ rb_ary_deconstruct(VALUE ary)
  *
  *  == Example Usage
  *
- *  In addition to the methods it mixes in through the Enumerable module, the
- *  \Array class has proprietary methods for accessing, searching and otherwise
+ *  In addition to the methods it mixes in through the Enumerable module,
+ *  class \Array has proprietary methods for accessing, searching and otherwise
  *  manipulating arrays.
  *
  *  Some of the more common ones are illustrated below.
@@ -8421,7 +8548,7 @@ rb_ary_deconstruct(VALUE ary)
  *
  *  == Obtaining Information about an \Array
  *
- *  Arrays keep track of their own length at all times.  To query an array
+ *  An array keeps track of its own length at all times.  To query an array
  *  about the number of elements it contains, use #length, #count or #size.
  *
  *    browsers = ['Chrome', 'Firefox', 'Safari', 'Opera', 'IE']
@@ -8436,7 +8563,7 @@ rb_ary_deconstruct(VALUE ary)
  *
  *    browsers.include?('Konqueror') #=> false
  *
- *  == Adding Items to Arrays
+ *  == Adding Items to an \Array
  *
  *  Items can be added to the end of an array by using either #push or #<<
  *
@@ -8497,11 +8624,11 @@ rb_ary_deconstruct(VALUE ary)
  *     arr = [2, 5, 6, 556, 6, 6, 8, 9, 0, 123, 556]
  *     arr.uniq #=> [2, 5, 6, 556, 8, 9, 0, 123]
  *
- *  == Iterating over Arrays
+ *  == Iterating over an \Array
  *
- *  Like all classes that include the Enumerable module, \Array has an each
+ *  Like all classes that include the Enumerable module, class \Array has an each
  *  method, which defines what elements should be iterated over and how.  In
- *  case of Array's #each, all elements in the \Array instance are yielded to
+ *  case of Array#each, all elements in +self+ are yielded to
  *  the supplied block in sequence.
  *
  *  Note that this operation leaves the array unchanged.
@@ -8561,7 +8688,7 @@ rb_ary_deconstruct(VALUE ary)
  *
  *  == What's Here
  *
- *  First, what's elsewhere. \Class \Array:
+ *  First, what's elsewhere. Class \Array:
  *
  *  - Inherits from {class Object}[rdoc-ref:Object@What-27s+Here].
  *  - Includes {module Enumerable}[rdoc-ref:Enumerable@What-27s+Here],
@@ -8586,148 +8713,132 @@ rb_ary_deconstruct(VALUE ary)
  *  - ::new: Returns a new array.
  *  - ::try_convert: Returns a new array created from a given object.
  *
+ *  See also {Creating Arrays}[rdoc-ref:Array@Creating+Arrays].
+ *
  *  === Methods for Querying
  *
- *  - #length, #size: Returns the count of elements.
- *  - #include?: Returns whether any element <tt>==</tt> a given object.
- *  - #empty?: Returns whether there are no elements.
  *  - #all?: Returns whether all elements meet a given criterion.
  *  - #any?: Returns whether any element meets a given criterion.
+ *  - #count: Returns the count of elements that meet a given criterion.
+ *  - #empty?: Returns whether there are no elements.
+ *  - #find_index (aliased as #index): Returns the index of the first element that meets a given criterion.
+ *  - #hash: Returns the integer hash code.
+ *  - #include?: Returns whether any element <tt>==</tt> a given object.
+ *  - #length (aliased as #size): Returns the count of elements.
  *  - #none?: Returns whether no element <tt>==</tt> a given object.
  *  - #one?: Returns whether exactly one element <tt>==</tt> a given object.
- *  - #count: Returns the count of elements that meet a given criterion.
- *  - #find_index, #index: Returns the index of the first element that meets a given criterion.
  *  - #rindex: Returns the index of the last element that meets a given criterion.
- *  - #hash: Returns the integer hash code.
  *
  *  === Methods for Comparing
  *
- *  - #<=>: Returns -1, 0, or 1 * as +self+ is less than, equal to, or
- *    greater than a given object.
- *  - #==: Returns whether each element in +self+ is <tt>==</tt> to the corresponding element
- *    in a given object.
- *  - #eql?: Returns whether each element in +self+ is <tt>eql?</tt> to the corresponding
- *    element in a given object.
+ *  - #<=>: Returns -1, 0, or 1, as +self+ is less than, equal to, or greater than a given object.
+ *  - #==: Returns whether each element in +self+ is <tt>==</tt> to the corresponding element in a given object.
+ *  - #eql?: Returns whether each element in +self+ is <tt>eql?</tt> to the corresponding element in a given object.
 
  *  === Methods for Fetching
  *
  *  These methods do not modify +self+.
  *
- *  - #[]: Returns one or more elements.
- *  - #fetch: Returns the element at a given offset.
- *  - #first: Returns one or more leading elements.
- *  - #last: Returns one or more trailing elements.
- *  - #max: Returns one or more maximum-valued elements,
- *    as determined by <tt><=></tt> or a given block.
- *  - #min: Returns one or more minimum-valued elements,
- *    as determined by <tt><=></tt> or a given block.
- *  - #minmax: Returns the minimum-valued and maximum-valued elements,
- *    as determined by <tt><=></tt> or a given block.
- *  - #assoc: Returns the first element that is an array
- *    whose first element <tt>==</tt> a given object.
- *  - #rassoc: Returns the first element that is an array
- *    whose second element <tt>==</tt> a given object.
+ *  - #[] (aliased as #slice): Returns consecutive elements as determined by a given argument.
+ *  - #assoc: Returns the first element that is an array whose first element <tt>==</tt> a given object.
  *  - #at: Returns the element at a given offset.
- *  - #values_at: Returns the elements at given offsets.
- *  - #dig: Returns the object in nested objects
- *    that is specified by a given index and additional arguments.
+ *  - #bsearch: Returns an element selected via a binary search as determined by a given block.
+ *  - #bsearch_index: Returns the index of an element selected via a binary search as determined by a given block.
+ *  - #compact: Returns an array containing all non-+nil+ elements.
+ *  - #dig: Returns the object in nested objects that is specified by a given index and additional arguments.
  *  - #drop: Returns trailing elements as determined by a given index.
- *  - #take: Returns leading elements as determined by a given index.
  *  - #drop_while: Returns trailing elements as determined by a given block.
- *  - #take_while: Returns leading elements as determined by a given block.
- *  - #slice: Returns consecutive elements as determined by a given argument.
- *  - #sort: Returns all elements in an order determined by <tt><=></tt> or a given block.
+ *  - #fetch: Returns the element at a given offset.
+ *  - #fetch_values: Returns elements at given offsets.
+ *  - #first: Returns one or more leading elements.
+ *  - #last: Returns one or more trailing elements.
+ *  - #max: Returns one or more maximum-valued elements, as determined by <tt>#<=></tt> or a given block.
+ *  - #min: Returns one or more minimum-valued elements, as determined by <tt>#<=></tt> or a given block.
+ *  - #minmax: Returns the minimum-valued and maximum-valued elements, as determined by <tt>#<=></tt> or a given block.
+ *  - #rassoc: Returns the first element that is an array whose second element <tt>==</tt> a given object.
+ *  - #reject: Returns an array containing elements not rejected by a given block.
  *  - #reverse: Returns all elements in reverse order.
- *  - #compact: Returns an array containing all non-+nil+ elements.
- *  - #select, #filter: Returns an array containing elements selected by a given block.
- *  - #uniq: Returns an array containing non-duplicate elements.
  *  - #rotate: Returns all elements with some rotated from one end to the other.
- *  - #bsearch: Returns an element selected via a binary search
- *    as determined by a given block.
- *  - #bsearch_index: Returns the index of an element selected via a binary search
- *    as determined by a given block.
  *  - #sample: Returns one or more random elements.
+ *  - #select (aliased as #filter): Returns an array containing elements selected by a given block.
  *  - #shuffle: Returns elements in a random order.
+ *  - #sort: Returns all elements in an order determined by <tt>#<=></tt> or a given block.
+ *  - #take: Returns leading elements as determined by a given index.
+ *  - #take_while: Returns leading elements as determined by a given block.
+ *  - #uniq: Returns an array containing non-duplicate elements.
+ *  - #values_at: Returns the elements at given offsets.
  *
  *  === Methods for Assigning
  *
  *  These methods add, replace, or reorder elements in +self+.
  *
+ *  - #<<: Appends an element.
  *  - #[]=: Assigns specified elements with a given object.
- *  - #push, #append, #<<: Appends trailing elements.
- *  - #unshift, #prepend: Prepends leading elements.
- *  - #insert: Inserts given objects at a given offset; does not replace elements.
  *  - #concat: Appends all elements from given arrays.
  *  - #fill: Replaces specified elements with specified objects.
- *  - #replace: Replaces the content of +self+ with the content of a given array.
+ *  - #flatten!: Replaces each nested array in +self+ with the elements from that array.
+ *  - #initialize_copy (aliased as #replace): Replaces the content of +self+ with the content of a given array.
+ *  - #insert: Inserts given objects at a given offset; does not replace elements.
+ *  - #push (aliased as #append): Appends elements.
  *  - #reverse!: Replaces +self+ with its elements reversed.
  *  - #rotate!: Replaces +self+ with its elements rotated.
  *  - #shuffle!: Replaces +self+ with its elements in random order.
- *  - #sort!: Replaces +self+ with its elements sorted,
- *    as determined by <tt><=></tt> or a given block.
+ *  - #sort!: Replaces +self+ with its elements sorted, as determined by <tt>#<=></tt> or a given block.
  *  - #sort_by!: Replaces +self+ with its elements sorted, as determined by a given block.
+ *  - #unshift (aliased as #prepend): Prepends leading elements.
  *
  *  === Methods for Deleting
  *
  *  Each of these methods removes elements from +self+:
  *
- *  - #pop: Removes and returns the last element.
- *  - #shift:  Removes and returns the first element.
- *  - #compact!: Removes all non-+nil+ elements.
+ *  - #clear: Removes all elements.
+ *  - #compact!: Removes all +nil+ elements.
  *  - #delete: Removes elements equal to a given object.
  *  - #delete_at: Removes the element at a given offset.
  *  - #delete_if: Removes elements specified by a given block.
  *  - #keep_if: Removes elements not specified by a given block.
+ *  - #pop: Removes and returns the last element.
  *  - #reject!: Removes elements specified by a given block.
- *  - #select!, #filter!: Removes elements not specified by a given block.
+ *  - #select! (aliased as #filter!): Removes elements not specified by a given block.
+ *  - #shift:  Removes and returns the first element.
  *  - #slice!: Removes and returns a sequence of elements.
  *  - #uniq!: Removes duplicates.
  *
  *  === Methods for Combining
  *
  *  - #&: Returns an array containing elements found both in +self+ and a given array.
- *  - #intersection: Returns an array containing elements found both in +self+
- *    and in each given array.
  *  - #+: Returns an array containing all elements of +self+ followed by all elements of a given array.
  *  - #-: Returns an array containing all elements of +self+ that are not found in a given array.
- *  - #|: Returns an array containing all elements of +self+ and all elements of a given array,
- *    duplicates removed.
- *  - #union: Returns an array containing all elements of +self+ and all elements of given arrays,
- *    duplicates removed.
- *  - #difference: Returns an array containing all elements of +self+ that are not found
- *    in any of the given arrays..
+ *  - #|: Returns an array containing all element of +self+ and all elements of a given array, duplicates removed.
+ *  - #difference: Returns an array containing all elements of +self+ that are not found in any of the given arrays..
+ *  - #intersection: Returns an array containing elements found both in +self+ and in each given array.
  *  - #product: Returns or yields all combinations of elements from +self+ and given arrays.
+ *  - #reverse: Returns an array containing all elements of +self+ in reverse order.
+ *  - #union: Returns an array containing all elements of +self+ and all elements of given arrays, duplicates removed.
  *
  *  === Methods for Iterating
  *
+ *  - #combination: Calls a given block with combinations of elements of +self+; a combination does not use the same element more than once.
+ *  - #cycle: Calls a given block with each element, then does so again, for a specified number of times, or forever.
  *  - #each: Passes each element to a given block.
- *  - #reverse_each:  Passes each element, in reverse order, to a given block.
  *  - #each_index: Passes each element index to a given block.
- *  - #cycle: Calls a given block with each element, then does so again,
- *    for a specified number of times, or forever.
- *  - #combination: Calls a given block with combinations of elements of +self+;
- *    a combination does not use the same element more than once.
- *  - #permutation: Calls a given block with permutations of elements of +self+;
- *    a permutation does not use the same element more than once.
- *  - #repeated_combination: Calls a given block with combinations of elements of +self+;
- *    a combination may use the same element more than once.
- *  - #repeated_permutation: Calls a given block with permutations of elements of +self+;
- *    a permutation may use the same element more than once.
+ *  - #permutation: Calls a given block with permutations of elements of +self+; a permutation does not use the same element more than once.
+ *  - #repeated_combination: Calls a given block with combinations of elements of +self+; a combination may use the same element more than once.
+ *  - #repeated_permutation: Calls a given block with permutations of elements of +self+; a permutation may use the same element more than once.
+ *  - #reverse_each:  Passes each element, in reverse order, to a given block.
  *
  *  === Methods for Converting
  *
- *  - #map, #collect: Returns an array containing the block return-value for each element.
- *  - #map!, #collect!: Replaces each element with a block return-value.
+ *  - #collect (aliased as #map): Returns an array containing the block return-value for each element.
+ *  - #collect! (aliased as #map!): Replaces each element with a block return-value.
  *  - #flatten: Returns an array that is a recursive flattening of +self+.
- *  - #flatten!: Replaces each nested array in +self+ with the elements from that array.
- *  - #inspect, #to_s: Returns a new String containing the elements.
- *  - #join: Returns a newsString containing the elements joined by the field separator.
+ *  - #inspect (aliased as #to_s): Returns a new String containing the elements.
+ *  - #join: Returns a new String containing the elements joined by the field separator.
  *  - #to_a: Returns +self+ or a new array containing all elements.
  *  - #to_ary: Returns +self+.
  *  - #to_h: Returns a new hash formed from the elements.
  *  - #transpose: Transposes +self+, which must be an array of arrays.
- *  - #zip: Returns a new array of arrays containing +self+ and given arrays;
- *    follow the link for details.
+ *  - #zip: Returns a new array of arrays containing +self+ and given arrays.
  *
  *  === Other Methods
  *
@@ -8738,7 +8849,6 @@ rb_ary_deconstruct(VALUE ary)
  *    - With string argument +field_separator+, a new string that is equivalent to
  *      <tt>join(field_separator)</tt>.
  *
- *  - #abbrev: Returns a hash of unambiguous abbreviations for elements.
  *  - #pack: Packs the elements into a binary sequence.
  *  - #sum: Returns a sum of elements according to either <tt>+</tt> or a given block.
  */
@@ -8746,6 +8856,8 @@ rb_ary_deconstruct(VALUE ary)
 void
 Init_Array(void)
 {
+    fake_ary_flags = init_fake_ary_flags();
+
     rb_cArray  = rb_define_class("Array", rb_cObject);
     rb_include_module(rb_cArray, rb_mEnumerable);
 
@@ -8770,8 +8882,6 @@ Init_Array(void)
     rb_define_method(rb_cArray, "[]=", rb_ary_aset, -1);
     rb_define_method(rb_cArray, "at", rb_ary_at, 1);
     rb_define_method(rb_cArray, "fetch", rb_ary_fetch, -1);
-    rb_define_method(rb_cArray, "first", rb_ary_first, -1);
-    rb_define_method(rb_cArray, "last", rb_ary_last, -1);
     rb_define_method(rb_cArray, "concat", rb_ary_concat_multi, -1);
     rb_define_method(rb_cArray, "union", rb_ary_union_multi, -1);
     rb_define_method(rb_cArray, "difference", rb_ary_difference_multi, -1);
@@ -8791,6 +8901,9 @@ Init_Array(void)
     rb_define_method(rb_cArray, "length", rb_ary_length, 0);
     rb_define_method(rb_cArray, "size", rb_ary_length, 0);
     rb_define_method(rb_cArray, "empty?", rb_ary_empty_p, 0);
+    rb_define_method(rb_cArray, "find", rb_ary_find, -1);
+    rb_define_method(rb_cArray, "detect", rb_ary_find, -1);
+    rb_define_method(rb_cArray, "rfind", rb_ary_rfind, -1);
     rb_define_method(rb_cArray, "find_index", rb_ary_index, -1);
     rb_define_method(rb_cArray, "index", rb_ary_index, -1);
     rb_define_method(rb_cArray, "rindex", rb_ary_rindex, -1);
@@ -8868,8 +8981,12 @@ Init_Array(void)
     rb_define_method(rb_cArray, "one?", rb_ary_one_p, -1);
     rb_define_method(rb_cArray, "dig", rb_ary_dig, -1);
     rb_define_method(rb_cArray, "sum", rb_ary_sum, -1);
+    rb_define_method(rb_cArray, "freeze", rb_ary_freeze, 0);
 
     rb_define_method(rb_cArray, "deconstruct", rb_ary_deconstruct, 0);
+
+    rb_cArray_empty_frozen = RB_OBJ_SET_SHAREABLE(rb_ary_freeze(rb_ary_new()));
+    rb_vm_register_global_object(rb_cArray_empty_frozen);
 }
 
 #include "array.rbinc"
diff --git a/array.rb b/array.rb
index b9fa9844e6..81beff0b1c 100644
--- a/array.rb
+++ b/array.rb
@@ -1,62 +1,97 @@
 class Array
   # call-seq:
-  #    array.shuffle!(random: Random) -> array
+  #   shuffle!(random: Random) -> self
   #
-  # Shuffles the elements of +self+ in place.
-  #    a = [1, 2, 3] #=> [1, 2, 3]
-  #    a.shuffle!    #=> [2, 3, 1]
-  #    a             #=> [2, 3, 1]
+  # Shuffles all elements in +self+ into a random order,
+  # as selected by the object given by the keyword argument +random+.
+  # Returns +self+:
   #
-  # The optional +random+ argument will be used as the random number generator:
-  #    a.shuffle!(random: Random.new(1))  #=> [1, 3, 2]
+  #   a =             [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
+  #   a.shuffle! # => [5, 3, 8, 7, 6, 1, 9, 4, 2, 0]
+  #   a.shuffle! # => [9, 4, 0, 6, 2, 8, 1, 5, 3, 7]
+  #
+  # Duplicate elements are included:
+  #
+  #   a =             [0, 1, 0, 1, 0, 1, 0, 1, 0, 1]
+  #   a.shuffle! # => [1, 0, 0, 1, 1, 0, 1, 0, 0, 1]
+  #   a.shuffle! # => [0, 1, 0, 1, 1, 0, 1, 0, 1, 0]
+  #
+  # The object given with the keyword argument +random+ is used as the random number generator.
+  #
+  # Related: see {Methods for Assigning}[rdoc-ref:Array@Methods+for+Assigning].
   def shuffle!(random: Random)
     Primitive.rb_ary_shuffle_bang(random)
   end
 
   # call-seq:
-  #    array.shuffle(random: Random) -> new_ary
+  #   shuffle(random: Random) -> new_array
+  #
+  # Returns a new array containing all elements from +self+ in a random order,
+  # as selected by the object given by the keyword argument +random+:
+  #
+  #   a =            [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
+  #   a.shuffle # => [0, 8, 1, 9, 6, 3, 4, 7, 2, 5]
+  #   a.shuffle # => [8, 9, 0, 5, 1, 2, 6, 4, 7, 3]
   #
-  # Returns a new array with elements of +self+ shuffled.
-  #    a = [1, 2, 3] #=> [1, 2, 3]
-  #    a.shuffle     #=> [2, 3, 1]
-  #    a             #=> [1, 2, 3]
+  # Duplicate elements are included:
   #
-  # The optional +random+ argument will be used as the random number generator:
-  #    a.shuffle(random: Random.new(1))  #=> [1, 3, 2]
+  #   a =            [0, 1, 0, 1, 0, 1, 0, 1, 0, 1]
+  #   a.shuffle # => [1, 0, 1, 1, 0, 0, 1, 0, 0, 1]
+  #   a.shuffle # => [1, 1, 0, 0, 0, 1, 1, 0, 0, 1]
+  #
+  # The object given with the keyword argument +random+ is used as the random number generator.
+  #
+  # Related: see {Methods for Fetching}[rdoc-ref:Array@Methods+for+Fetching].
   def shuffle(random: Random)
     Primitive.rb_ary_shuffle(random)
   end
 
   # call-seq:
-  #    array.sample(random: Random) -> object
-  #    array.sample(n, random: Random) -> new_ary
+  #   sample(random: Random) -> object
+  #   sample(count, random: Random) -> new_ary
   #
-  # Returns random elements from +self+.
+  # Returns random elements from +self+,
+  # as selected by the object given by the keyword argument +random+.
   #
-  # When no arguments are given, returns a random element from +self+:
-  #    a = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
-  #    a.sample # => 3
-  #    a.sample # => 8
-  # If +self+ is empty, returns +nil+.
+  # With no argument +count+ given, returns one random element from +self+:
+  #
+  #   a = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
+  #   a.sample # => 3
+  #   a.sample # => 8
+  #
+  # Returns +nil+ if +self+ is empty:
+  #
+  #   [].sample # => nil
+  #
+  # With a non-negative numeric argument +count+ given,
+  # returns a new array containing +count+ random elements from +self+:
+  #
+  #   a.sample(3) # => [8, 9, 2]
+  #   a.sample(6) # => [9, 6, 0, 3, 1, 4]
+  #
+  # The order of the result array is unrelated to the order of +self+.
+  #
+  # Returns a new empty array if +self+ is empty:
+  #
+  #   [].sample(4) # => []
+  #
+  # May return duplicates in +self+:
+  #
+  #   a = [1, 1, 1, 2, 2, 3]
+  #   a.sample(a.size) # => [1, 1, 3, 2, 1, 2]
   #
-  # When argument +n+ is given, returns a new \Array containing +n+ random
-  # elements from +self+:
-  #    a.sample(3) # => [8, 9, 2]
-  #    a.sample(6) # => [9, 6, 10, 3, 1, 4]
   # Returns no more than <tt>a.size</tt> elements
   # (because no new duplicates are introduced):
-  #    a.sample(a.size * 2) # => [6, 4, 1, 8, 5, 9, 10, 2, 3, 7]
-  # But +self+ may contain duplicates:
-  #    a = [1, 1, 1, 2, 2, 3]
-  #    a.sample(a.size * 2) # => [1, 1, 3, 2, 1, 2]
-  # The argument +n+ must be a non-negative numeric value.
-  # The order of the result array is unrelated to the order of +self+.
-  # Returns a new empty \Array if +self+ is empty.
   #
-  # The optional +random+ argument will be used as the random number generator:
-  #    a = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
-  #    a.sample(random: Random.new(1))     #=> 6
-  #    a.sample(4, random: Random.new(1))  #=> [6, 10, 9, 2]
+  #   a.sample(50) # => [6, 4, 1, 8, 5, 9, 0, 2, 3, 7]
+  #
+  # The object given with the keyword argument +random+ is used as the random number generator:
+  #
+  #   a = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
+  #   a.sample(random: Random.new(1))     # => 6
+  #   a.sample(4, random: Random.new(1))  # => [6, 10, 9, 2]
+  #
+  # Related: see {Methods for Fetching}[rdoc-ref:Array@Methods+for+Fetching].
   def sample(n = (ary = false), random: Random)
     if Primitive.mandatory_only?
       # Primitive.cexpr! %{ rb_ary_sample(self, rb_cRandom, Qfalse, Qfalse) }
@@ -66,4 +101,187 @@ class Array
       Primitive.ary_sample(random, n, ary)
     end
   end
+
+  # call-seq:
+  #   first -> object or nil
+  #   first(count) -> new_array
+  #
+  # Returns elements from +self+, or +nil+; does not modify +self+.
+  #
+  # With no argument given, returns the first element (if available):
+  #
+  #   a = [:foo, 'bar', 2]
+  #   a.first # => :foo
+  #   a # => [:foo, "bar", 2]
+  #
+  # If +self+ is empty, returns +nil+.
+  #
+  #   [].first # => nil
+  #
+  # With a non-negative integer argument +count+ given,
+  # returns the first +count+ elements (as available) in a new array:
+  #
+  #   a.first(0)  # => []
+  #   a.first(2)  # => [:foo, "bar"]
+  #   a.first(50) # => [:foo, "bar", 2]
+  #
+  # Related: see {Methods for Querying}[rdoc-ref:Array@Methods+for+Querying].
+  def first n = unspecified = true
+    if Primitive.mandatory_only?
+      Primitive.attr! :leaf
+      Primitive.cexpr! %q{ ary_first(self) }
+    else
+      if unspecified
+        Primitive.cexpr! %q{ ary_first(self) }
+      else
+        Primitive.cexpr! %q{  ary_take_first_or_last_n(self, NUM2LONG(n), ARY_TAKE_FIRST) }
+      end
+    end
+  end
+
+  # call-seq:
+  #  last  -> last_object or nil
+  #  last(count) -> new_array
+  #
+  # Returns elements from +self+, or +nil+; +self+ is not modified.
+  #
+  # With no argument given, returns the last element, or +nil+ if +self+ is empty:
+  #
+  #   a = [:foo, 'bar', 2]
+  #   a.last # => 2
+  #   a # => [:foo, "bar", 2]
+  #   [].last # => nil
+  #
+  #
+  # With non-negative integer argument +count+ given,
+  # returns a new array containing the trailing +count+ elements of +self+, as available:
+  #
+  #   a = [:foo, 'bar', 2]
+  #   a.last(2)  # => ["bar", 2]
+  #   a.last(50) # => [:foo, "bar", 2]
+  #   a.last(0)  # => []
+  #   [].last(3) # => []
+  #
+  # Related: see {Methods for Fetching}[rdoc-ref:Array@Methods+for+Fetching].
+  def last n = unspecified = true
+    if Primitive.mandatory_only?
+      Primitive.attr! :leaf
+      Primitive.cexpr! %q{ ary_last(self) }
+    else
+      if unspecified
+        Primitive.cexpr! %q{ ary_last(self) }
+      else
+        Primitive.cexpr! %q{ ary_take_first_or_last_n(self, NUM2LONG(n), ARY_TAKE_LAST) }
+      end
+    end
+  end
+
+  # call-seq:
+  #   fetch_values(*indexes) -> new_array
+  #   fetch_values(*indexes) { |index| ... } -> new_array
+  #
+  # With no block given, returns a new array containing the elements of +self+
+  # at the offsets specified by +indexes+. Each of the +indexes+ must be an
+  # {integer-convertible object}[rdoc-ref:implicit_conversion.rdoc@Integer-Convertible+Objects]:
+  #
+  #    a = [:foo, :bar, :baz]
+  #    a.fetch_values(2, 0)   # => [:baz, :foo]
+  #    a.fetch_values(2.1, 0) # => [:baz, :foo]
+  #    a.fetch_values         # => []
+  #
+  # For a negative index, counts backwards from the end of the array:
+  #
+  #    a.fetch_values(-2, -1) # [:bar, :baz]
+  #
+  # When no block is given, raises an exception if any index is out of range.
+  #
+  # With a block given, for each index:
+  #
+  # - If the index is in range, uses an element of +self+ (as above).
+  # - Otherwise, calls the block with the index and uses the block's return value.
+  #
+  # Example:
+  #
+  #   a = [:foo, :bar, :baz]
+  #   a.fetch_values(1, 0, 42, 777) { |index| index.to_s }
+  #   # => [:bar, :foo, "42", "777"]
+  #
+  # Related: see {Methods for Fetching}[rdoc-ref:Array@Methods+for+Fetching].
+  def fetch_values(*indexes, &block)
+    indexes.map! { |i| fetch(i, &block) }
+    indexes
+  end
+
+  with_jit do
+    if Primitive.rb_builtin_basic_definition_p(:each)
+      undef :each
+
+      def each # :nodoc:
+        Primitive.attr! :inline_block, :c_trace
+
+        unless defined?(yield)
+          return Primitive.cexpr! 'SIZED_ENUMERATOR(self, 0, 0, ary_enum_length)'
+        end
+        _i = 0
+        value = nil
+        while Primitive.cexpr!(%q{ ary_fetch_next(self, LOCAL_PTR(_i), LOCAL_PTR(value)) })
+          yield value
+        end
+        self
+      end
+    end
+
+    if Primitive.rb_builtin_basic_definition_p(:map)
+      undef :map
+
+      def map # :nodoc:
+        Primitive.attr! :inline_block, :c_trace
+
+        unless defined?(yield)
+          return Primitive.cexpr! 'SIZED_ENUMERATOR(self, 0, 0, ary_enum_length)'
+        end
+
+        _i = 0
+        value = nil
+        result = Primitive.ary_sized_alloc
+        while Primitive.cexpr!(%q{ ary_fetch_next(self, LOCAL_PTR(_i), LOCAL_PTR(value)) })
+          value = yield(value)
+          Primitive.cexpr!(%q{ rb_ary_push(result, value) })
+        end
+        result
+      end
+
+      if Primitive.rb_builtin_basic_definition_p(:collect)
+        undef :collect
+        alias collect map
+      end
+    end
+
+    if Primitive.rb_builtin_basic_definition_p(:select)
+      undef :select
+
+      def select # :nodoc:
+        Primitive.attr! :inline_block, :c_trace
+
+        unless defined?(yield)
+          return Primitive.cexpr! 'SIZED_ENUMERATOR(self, 0, 0, ary_enum_length)'
+        end
+
+        _i = 0
+        value = nil
+        result = Primitive.ary_sized_alloc
+        while Primitive.cexpr!(%q{ ary_fetch_next(self, LOCAL_PTR(_i), LOCAL_PTR(value)) })
+          if yield value
+            Primitive.cexpr!(%q{ rb_ary_push(result, value) })
+          end
+        end
+        result
+      end
+
+      if Primitive.rb_builtin_basic_definition_p(:filter)
+        undef :filter
+        alias filter select
+      end
+    end
+  end
 end
diff --git a/ast.c b/ast.c
index 42d4126a5b..5357aa38a5 100644
--- a/ast.c
+++ b/ast.c
@@ -1,6 +1,6 @@
 /* indent-tabs-mode: nil */
 #include "internal.h"
-#include "internal/parse.h"
+#include "internal/ruby_parser.h"
 #include "internal/symbol.h"
 #include "internal/warnings.h"
 #include "iseq.h"
@@ -14,9 +14,10 @@
 
 static VALUE rb_mAST;
 static VALUE rb_cNode;
+static VALUE rb_cLocation;
 
 struct ASTNodeData {
-    rb_ast_t *ast;
+    VALUE ast_value;
     const NODE *node;
 };
 
@@ -24,14 +25,20 @@ static void
 node_gc_mark(void *ptr)
 {
     struct ASTNodeData *data = (struct ASTNodeData *)ptr;
-    rb_gc_mark((VALUE)data->ast);
+    rb_gc_mark(data->ast_value);
 }
 
 static size_t
 node_memsize(const void *ptr)
 {
     struct ASTNodeData *data = (struct ASTNodeData *)ptr;
-    return rb_ast_memsize(data->ast);
+    size_t size = sizeof(struct ASTNodeData);
+    if (data->ast_value) {
+        rb_ast_t *ast = rb_ruby_ast_data_get(data->ast_value);
+        size += rb_ast_memsize(ast);
+    }
+
+    return size;
 }
 
 static const rb_data_type_t rb_node_type = {
@@ -41,31 +48,57 @@ static const rb_data_type_t rb_node_type = {
     RUBY_TYPED_FREE_IMMEDIATELY,
 };
 
+struct ASTLocationData {
+    int first_lineno;
+    int first_column;
+    int last_lineno;
+    int last_column;
+};
+
+static void
+location_gc_mark(void *ptr)
+{
+}
+
+static size_t
+location_memsize(const void *ptr)
+{
+    return sizeof(struct ASTLocationData);
+}
+
+static const rb_data_type_t rb_location_type = {
+    "AST/location",
+    {location_gc_mark, RUBY_TYPED_DEFAULT_FREE, location_memsize,},
+    0, 0,
+    RUBY_TYPED_FREE_IMMEDIATELY,
+};
+
+
 static VALUE rb_ast_node_alloc(VALUE klass);
 
 static void
-setup_node(VALUE obj, rb_ast_t *ast, const NODE *node)
+setup_node(VALUE obj, VALUE ast_value, const NODE *node)
 {
     struct ASTNodeData *data;
 
     TypedData_Get_Struct(obj, struct ASTNodeData, &rb_node_type, data);
-    data->ast = ast;
+    data->ast_value = ast_value;
     data->node = node;
 }
 
 static VALUE
-ast_new_internal(rb_ast_t *ast, const NODE *node)
+ast_new_internal(VALUE ast_value, const NODE *node)
 {
     VALUE obj;
 
     obj = rb_ast_node_alloc(rb_cNode);
-    setup_node(obj, ast, node);
+    setup_node(obj, ast_value, node);
 
     return obj;
 }
 
-static VALUE rb_ast_parse_str(VALUE str, VALUE keep_script_lines);
-static VALUE rb_ast_parse_file(VALUE path, VALUE keep_script_lines);
+static VALUE rb_ast_parse_str(VALUE str, VALUE keep_script_lines, VALUE error_tolerant, VALUE keep_tokens);
+static VALUE rb_ast_parse_file(VALUE path, VALUE keep_script_lines, VALUE error_tolerant, VALUE keep_tokens);
 
 static VALUE
 ast_parse_new(void)
@@ -74,83 +107,77 @@ ast_parse_new(void)
 }
 
 static VALUE
-ast_parse_done(rb_ast_t *ast)
+ast_parse_done(VALUE ast_value)
 {
+    rb_ast_t *ast = rb_ruby_ast_data_get(ast_value);
+
     if (!ast->body.root) {
         rb_ast_dispose(ast);
         rb_exc_raise(GET_EC()->errinfo);
     }
 
-    return ast_new_internal(ast, (NODE *)ast->body.root);
+    return ast_new_internal(ast_value, (NODE *)ast->body.root);
 }
 
 static VALUE
-ast_s_parse(rb_execution_context_t *ec, VALUE module, VALUE str, VALUE keep_script_lines)
+setup_vparser(VALUE keep_script_lines, VALUE error_tolerant, VALUE keep_tokens)
 {
-    return rb_ast_parse_str(str, keep_script_lines);
+    VALUE vparser = ast_parse_new();
+    if (RTEST(keep_script_lines)) rb_parser_set_script_lines(vparser);
+    if (RTEST(error_tolerant)) rb_parser_error_tolerant(vparser);
+    if (RTEST(keep_tokens)) rb_parser_keep_tokens(vparser);
+    return vparser;
 }
 
 static VALUE
-rb_ast_parse_str(VALUE str, VALUE keep_script_lines)
+ast_s_parse(rb_execution_context_t *ec, VALUE module, VALUE str, VALUE keep_script_lines, VALUE error_tolerant, VALUE keep_tokens)
 {
-    rb_ast_t *ast = 0;
+    return rb_ast_parse_str(str, keep_script_lines, error_tolerant, keep_tokens);
+}
 
+static VALUE
+rb_ast_parse_str(VALUE str, VALUE keep_script_lines, VALUE error_tolerant, VALUE keep_tokens)
+{
+    VALUE ast_value = Qnil;
     StringValue(str);
-    VALUE vparser = ast_parse_new();
-    if (RTEST(keep_script_lines)) rb_parser_keep_script_lines(vparser);
-    ast = rb_parser_compile_string_path(vparser, Qnil, str, 1);
-    return ast_parse_done(ast);
+    VALUE vparser = setup_vparser(keep_script_lines, error_tolerant, keep_tokens);
+    ast_value = rb_parser_compile_string_path(vparser, Qnil, str, 1);
+    return ast_parse_done(ast_value);
 }
 
 static VALUE
-ast_s_parse_file(rb_execution_context_t *ec, VALUE module, VALUE path, VALUE keep_script_lines)
+ast_s_parse_file(rb_execution_context_t *ec, VALUE module, VALUE path, VALUE keep_script_lines, VALUE error_tolerant, VALUE keep_tokens)
 {
-    return rb_ast_parse_file(path, keep_script_lines);
+    return rb_ast_parse_file(path, keep_script_lines, error_tolerant, keep_tokens);
 }
 
 static VALUE
-rb_ast_parse_file(VALUE path, VALUE keep_script_lines)
+rb_ast_parse_file(VALUE path, VALUE keep_script_lines, VALUE error_tolerant, VALUE keep_tokens)
 {
     VALUE f;
-    rb_ast_t *ast = 0;
+    VALUE ast_value = Qnil;
     rb_encoding *enc = rb_utf8_encoding();
 
-    FilePathValue(path);
     f = rb_file_open_str(path, "r");
     rb_funcall(f, rb_intern("set_encoding"), 2, rb_enc_from_encoding(enc), rb_str_new_cstr("-"));
-    VALUE vparser = ast_parse_new();
-    if (RTEST(keep_script_lines)) rb_parser_keep_script_lines(vparser);
-    ast = rb_parser_compile_file_path(vparser, Qnil, f, 1);
+    VALUE vparser = setup_vparser(keep_script_lines, error_tolerant, keep_tokens);
+    ast_value = rb_parser_compile_file_path(vparser, Qnil, f, 1);
     rb_io_close(f);
-    return ast_parse_done(ast);
+    return ast_parse_done(ast_value);
 }
 
 static VALUE
-lex_array(VALUE array, int index)
+rb_ast_parse_array(VALUE array, VALUE keep_script_lines, VALUE error_tolerant, VALUE keep_tokens)
 {
-    VALUE str = rb_ary_entry(array, index);
-    if (!NIL_P(str)) {
-        StringValue(str);
-        if (!rb_enc_asciicompat(rb_enc_get(str))) {
-            rb_raise(rb_eArgError, "invalid source encoding");
-        }
-    }
-    return str;
-}
-
-static VALUE
-rb_ast_parse_array(VALUE array, VALUE keep_script_lines)
-{
-    rb_ast_t *ast = 0;
+    VALUE ast_value = Qnil;
 
     array = rb_check_array_type(array);
-    VALUE vparser = ast_parse_new();
-    if (RTEST(keep_script_lines)) rb_parser_keep_script_lines(vparser);
-    ast = rb_parser_compile_generic(vparser, lex_array, Qnil, array, 1);
-    return ast_parse_done(ast);
+    VALUE vparser = setup_vparser(keep_script_lines, error_tolerant, keep_tokens);
+    ast_value = rb_parser_compile_array(vparser, Qnil, array, 1);
+    return ast_parse_done(ast_value);
 }
 
-static VALUE node_children(rb_ast_t*, const NODE*);
+static VALUE node_children(VALUE, const NODE*);
 
 static VALUE
 node_find(VALUE self, const int node_id)
@@ -162,7 +189,7 @@ node_find(VALUE self, const int node_id)
 
     if (nd_node_id(data->node) == node_id) return self;
 
-    ary = node_children(data->ast, data->node);
+    ary = node_children(data->ast_value, data->node);
 
     for (i = 0; i < RARRAY_LEN(ary); i++) {
         VALUE child = RARRAY_AREF(ary, i);
@@ -179,21 +206,24 @@ node_find(VALUE self, const int node_id)
 extern VALUE rb_e_script;
 
 static VALUE
-script_lines(VALUE path)
+node_id_for_backtrace_location(rb_execution_context_t *ec, VALUE module, VALUE location)
 {
-    VALUE hash, lines;
-    ID script_lines;
-    CONST_ID(script_lines, "SCRIPT_LINES__");
-    if (!rb_const_defined_at(rb_cObject, script_lines)) return Qnil;
-    hash = rb_const_get_at(rb_cObject, script_lines);
-    if (!RB_TYPE_P(hash, T_HASH)) return Qnil;
-    lines = rb_hash_lookup(hash, path);
-    if (!RB_TYPE_P(lines, T_ARRAY)) return Qnil;
-    return lines;
+    int node_id;
+
+    if (!rb_frame_info_p(location)) {
+        rb_raise(rb_eTypeError, "Thread::Backtrace::Location object expected");
+    }
+
+    node_id = rb_get_node_id_from_frame_info(location);
+    if (node_id == -1) {
+        return Qnil;
+    }
+
+    return INT2NUM(node_id);
 }
 
 static VALUE
-ast_s_of(rb_execution_context_t *ec, VALUE module, VALUE body, VALUE keep_script_lines)
+ast_s_of(rb_execution_context_t *ec, VALUE module, VALUE body, VALUE keep_script_lines, VALUE error_tolerant, VALUE keep_tokens)
 {
     VALUE node, lines = Qnil;
     const rb_iseq_t *iseq;
@@ -222,6 +252,11 @@ ast_s_of(rb_execution_context_t *ec, VALUE module, VALUE body, VALUE keep_script
     if (!iseq) {
         return Qnil;
     }
+
+    if (ISEQ_BODY(iseq)->prism) {
+        rb_raise(rb_eRuntimeError, "cannot get AST for ISEQ compiled by prism");
+    }
+
     lines = ISEQ_BODY(iseq)->variable.script_lines;
 
     VALUE path = rb_iseq_path(iseq);
@@ -231,14 +266,14 @@ ast_s_of(rb_execution_context_t *ec, VALUE module, VALUE body, VALUE keep_script
         rb_raise(rb_eArgError, "cannot get AST for method defined in eval");
     }
 
-    if (!NIL_P(lines) || !NIL_P(lines = script_lines(path))) {
-        node = rb_ast_parse_array(lines, keep_script_lines);
+    if (!NIL_P(lines)) {
+        node = rb_ast_parse_array(lines, keep_script_lines, error_tolerant, keep_tokens);
     }
     else if (e_option) {
-        node = rb_ast_parse_str(rb_e_script, keep_script_lines);
+        node = rb_ast_parse_str(rb_e_script, keep_script_lines, error_tolerant, keep_tokens);
     }
     else {
-        node = rb_ast_parse_file(path, keep_script_lines);
+        node = rb_ast_parse_file(path, keep_script_lines, error_tolerant, keep_tokens);
     }
 
     return node_find(node, node_id);
@@ -277,10 +312,10 @@ ast_node_node_id(rb_execution_context_t *ec, VALUE self)
     return INT2FIX(nd_node_id(data->node));
 }
 
-#define NEW_CHILD(ast, node) node ? ast_new_internal(ast, node) : Qnil
+#define NEW_CHILD(ast_value, node) (node ? ast_new_internal(ast_value, node) : Qnil)
 
 static VALUE
-rb_ary_new_from_node_args(rb_ast_t *ast, long n, ...)
+rb_ary_new_from_node_args(VALUE ast_value, long n, ...)
 {
     va_list ar;
     VALUE ary;
@@ -292,39 +327,57 @@ rb_ary_new_from_node_args(rb_ast_t *ast, long n, ...)
     for (i=0; i<n; i++) {
         NODE *node;
         node = va_arg(ar, NODE *);
-        rb_ary_push(ary, NEW_CHILD(ast, node));
+        rb_ary_push(ary, NEW_CHILD(ast_value, node));
     }
     va_end(ar);
     return ary;
 }
 
 static VALUE
-dump_block(rb_ast_t *ast, const NODE *node)
+dump_block(VALUE ast_value, const struct RNode_BLOCK *node)
 {
     VALUE ary = rb_ary_new();
     do {
-        rb_ary_push(ary, NEW_CHILD(ast, node->nd_head));
+        rb_ary_push(ary, NEW_CHILD(ast_value, node->nd_head));
     } while (node->nd_next &&
         nd_type_p(node->nd_next, NODE_BLOCK) &&
-        (node = node->nd_next, 1));
+        (node = RNODE_BLOCK(node->nd_next), 1));
     if (node->nd_next) {
-        rb_ary_push(ary, NEW_CHILD(ast, node->nd_next));
+        rb_ary_push(ary, NEW_CHILD(ast_value, node->nd_next));
     }
 
     return ary;
 }
 
 static VALUE
-dump_array(rb_ast_t *ast, const NODE *node)
+dump_array(VALUE ast_value, const struct RNode_LIST *node)
 {
     VALUE ary = rb_ary_new();
-    rb_ary_push(ary, NEW_CHILD(ast, node->nd_head));
+    rb_ary_push(ary, NEW_CHILD(ast_value, node->nd_head));
 
     while (node->nd_next && nd_type_p(node->nd_next, NODE_LIST)) {
-        node = node->nd_next;
-        rb_ary_push(ary, NEW_CHILD(ast, node->nd_head));
+        node = RNODE_LIST(node->nd_next);
+        rb_ary_push(ary, NEW_CHILD(ast_value, node->nd_head));
+    }
+    rb_ary_push(ary, NEW_CHILD(ast_value, node->nd_next));
+
+    return ary;
+}
+
+static VALUE
+dump_parser_array(VALUE ast_value, rb_parser_ary_t *p_ary)
+{
+    VALUE ary;
+
+    if (p_ary->data_type != PARSER_ARY_DATA_NODE) {
+        rb_bug("unexpected rb_parser_ary_data_type: %d", p_ary->data_type);
+    }
+
+    ary = rb_ary_new();
+
+    for (long i = 0; i < p_ary->len; i++) {
+        rb_ary_push(ary, NEW_CHILD(ast_value, p_ary->data[i]));
     }
-    rb_ary_push(ary, NEW_CHILD(ast, node->nd_next));
 
     return ary;
 }
@@ -346,305 +399,341 @@ no_name_rest(void)
 }
 
 static VALUE
-rest_arg(rb_ast_t *ast, const NODE *rest_arg)
+rest_arg(VALUE ast_value, const NODE *rest_arg)
 {
-    return NODE_NAMED_REST_P(rest_arg) ? NEW_CHILD(ast, rest_arg) : no_name_rest();
+    return NODE_NAMED_REST_P(rest_arg) ? NEW_CHILD(ast_value, rest_arg) : no_name_rest();
 }
 
 static VALUE
-node_children(rb_ast_t *ast, const NODE *node)
+node_children(VALUE ast_value, const NODE *node)
 {
-    char name[DECIMAL_SIZE_OF_BITS(sizeof(long) * CHAR_BIT) + 2]; /* including '$' */
+    char name[sizeof("$") + DECIMAL_SIZE_OF(long)];
 
     enum node_type type = nd_type(node);
     switch (type) {
       case NODE_BLOCK:
-        return dump_block(ast, node);
+        return dump_block(ast_value, RNODE_BLOCK(node));
       case NODE_IF:
-        return rb_ary_new_from_node_args(ast, 3, node->nd_cond, node->nd_body, node->nd_else);
+        return rb_ary_new_from_node_args(ast_value, 3, RNODE_IF(node)->nd_cond, RNODE_IF(node)->nd_body, RNODE_IF(node)->nd_else);
       case NODE_UNLESS:
-        return rb_ary_new_from_node_args(ast, 3, node->nd_cond, node->nd_body, node->nd_else);
+        return rb_ary_new_from_node_args(ast_value, 3, RNODE_UNLESS(node)->nd_cond, RNODE_UNLESS(node)->nd_body, RNODE_UNLESS(node)->nd_else);
       case NODE_CASE:
-        return rb_ary_new_from_node_args(ast, 2, node->nd_head, node->nd_body);
+        return rb_ary_new_from_node_args(ast_value, 2, RNODE_CASE(node)->nd_head, RNODE_CASE(node)->nd_body);
       case NODE_CASE2:
-        return rb_ary_new_from_node_args(ast, 2, node->nd_head, node->nd_body);
+        return rb_ary_new_from_node_args(ast_value, 2, RNODE_CASE2(node)->nd_head, RNODE_CASE2(node)->nd_body);
       case NODE_CASE3:
-        return rb_ary_new_from_node_args(ast, 2, node->nd_head, node->nd_body);
+        return rb_ary_new_from_node_args(ast_value, 2, RNODE_CASE3(node)->nd_head, RNODE_CASE3(node)->nd_body);
       case NODE_WHEN:
-        return rb_ary_new_from_node_args(ast, 3, node->nd_head, node->nd_body, node->nd_next);
+        return rb_ary_new_from_node_args(ast_value, 3, RNODE_WHEN(node)->nd_head, RNODE_WHEN(node)->nd_body, RNODE_WHEN(node)->nd_next);
       case NODE_IN:
-        return rb_ary_new_from_node_args(ast, 3, node->nd_head, node->nd_body, node->nd_next);
+        return rb_ary_new_from_node_args(ast_value, 3, RNODE_IN(node)->nd_head, RNODE_IN(node)->nd_body, RNODE_IN(node)->nd_next);
       case NODE_WHILE:
       case NODE_UNTIL:
-        return rb_ary_push(rb_ary_new_from_node_args(ast, 2, node->nd_cond, node->nd_body),
-                           RBOOL(node->nd_state));
+        return rb_ary_push(rb_ary_new_from_node_args(ast_value, 2, RNODE_WHILE(node)->nd_cond, RNODE_WHILE(node)->nd_body),
+                           RBOOL(RNODE_WHILE(node)->nd_state));
       case NODE_ITER:
       case NODE_FOR:
-        return rb_ary_new_from_node_args(ast, 2, node->nd_iter, node->nd_body);
+        return rb_ary_new_from_node_args(ast_value, 2, RNODE_ITER(node)->nd_iter, RNODE_ITER(node)->nd_body);
       case NODE_FOR_MASGN:
-        return rb_ary_new_from_node_args(ast, 1, node->nd_var);
+        return rb_ary_new_from_node_args(ast_value, 1, RNODE_FOR_MASGN(node)->nd_var);
       case NODE_BREAK:
+        return rb_ary_new_from_node_args(ast_value, 1, RNODE_BREAK(node)->nd_stts);
       case NODE_NEXT:
+        return rb_ary_new_from_node_args(ast_value, 1, RNODE_NEXT(node)->nd_stts);
       case NODE_RETURN:
-        return rb_ary_new_from_node_args(ast, 1, node->nd_stts);
+        return rb_ary_new_from_node_args(ast_value, 1, RNODE_RETURN(node)->nd_stts);
       case NODE_REDO:
-        return rb_ary_new_from_node_args(ast, 0);
+        return rb_ary_new_from_node_args(ast_value, 0);
       case NODE_RETRY:
-        return rb_ary_new_from_node_args(ast, 0);
+        return rb_ary_new_from_node_args(ast_value, 0);
       case NODE_BEGIN:
-        return rb_ary_new_from_node_args(ast, 1, node->nd_body);
+        return rb_ary_new_from_node_args(ast_value, 1, RNODE_BEGIN(node)->nd_body);
       case NODE_RESCUE:
-        return rb_ary_new_from_node_args(ast, 3, node->nd_head, node->nd_resq, node->nd_else);
+        return rb_ary_new_from_node_args(ast_value, 3, RNODE_RESCUE(node)->nd_head, RNODE_RESCUE(node)->nd_resq, RNODE_RESCUE(node)->nd_else);
       case NODE_RESBODY:
-        return rb_ary_new_from_node_args(ast, 3, node->nd_args, node->nd_body, node->nd_head);
+        return rb_ary_new_from_node_args(ast_value, 4, RNODE_RESBODY(node)->nd_args, RNODE_RESBODY(node)->nd_exc_var, RNODE_RESBODY(node)->nd_body, RNODE_RESBODY(node)->nd_next);
       case NODE_ENSURE:
-        return rb_ary_new_from_node_args(ast, 2, node->nd_head, node->nd_ensr);
+        return rb_ary_new_from_node_args(ast_value, 2, RNODE_ENSURE(node)->nd_head, RNODE_ENSURE(node)->nd_ensr);
       case NODE_AND:
       case NODE_OR:
         {
             VALUE ary = rb_ary_new();
 
             while (1) {
-                rb_ary_push(ary, NEW_CHILD(ast, node->nd_1st));
-                if (!node->nd_2nd || !nd_type_p(node->nd_2nd, type))
+                rb_ary_push(ary, NEW_CHILD(ast_value, RNODE_AND(node)->nd_1st));
+                if (!RNODE_AND(node)->nd_2nd || !nd_type_p(RNODE_AND(node)->nd_2nd, type))
                     break;
-                node = node->nd_2nd;
+                node = RNODE_AND(node)->nd_2nd;
             }
-            rb_ary_push(ary, NEW_CHILD(ast, node->nd_2nd));
+            rb_ary_push(ary, NEW_CHILD(ast_value, RNODE_AND(node)->nd_2nd));
             return ary;
         }
       case NODE_MASGN:
-        if (NODE_NAMED_REST_P(node->nd_args)) {
-            return rb_ary_new_from_node_args(ast, 3, node->nd_value, node->nd_head, node->nd_args);
+        if (NODE_NAMED_REST_P(RNODE_MASGN(node)->nd_args)) {
+            return rb_ary_new_from_node_args(ast_value, 3, RNODE_MASGN(node)->nd_value, RNODE_MASGN(node)->nd_head, RNODE_MASGN(node)->nd_args);
         }
         else {
-            return rb_ary_new_from_args(3, NEW_CHILD(ast, node->nd_value),
-                                        NEW_CHILD(ast, node->nd_head),
+            return rb_ary_new_from_args(3, NEW_CHILD(ast_value, RNODE_MASGN(node)->nd_value),
+                                        NEW_CHILD(ast_value, RNODE_MASGN(node)->nd_head),
                                         no_name_rest());
         }
       case NODE_LASGN:
+        if (NODE_REQUIRED_KEYWORD_P(RNODE_LASGN(node)->nd_value)) {
+            return rb_ary_new_from_args(2, var_name(RNODE_LASGN(node)->nd_vid), ID2SYM(rb_intern("NODE_SPECIAL_REQUIRED_KEYWORD")));
+        }
+        return rb_ary_new_from_args(2, var_name(RNODE_LASGN(node)->nd_vid), NEW_CHILD(ast_value, RNODE_LASGN(node)->nd_value));
       case NODE_DASGN:
+        if (NODE_REQUIRED_KEYWORD_P(RNODE_DASGN(node)->nd_value)) {
+            return rb_ary_new_from_args(2, var_name(RNODE_DASGN(node)->nd_vid), ID2SYM(rb_intern("NODE_SPECIAL_REQUIRED_KEYWORD")));
+        }
+        return rb_ary_new_from_args(2, var_name(RNODE_DASGN(node)->nd_vid), NEW_CHILD(ast_value, RNODE_DASGN(node)->nd_value));
       case NODE_IASGN:
+        return rb_ary_new_from_args(2, var_name(RNODE_IASGN(node)->nd_vid), NEW_CHILD(ast_value, RNODE_IASGN(node)->nd_value));
       case NODE_CVASGN:
+        return rb_ary_new_from_args(2, var_name(RNODE_CVASGN(node)->nd_vid), NEW_CHILD(ast_value, RNODE_CVASGN(node)->nd_value));
       case NODE_GASGN:
-        if (NODE_REQUIRED_KEYWORD_P(node)) {
-            return rb_ary_new_from_args(2, var_name(node->nd_vid), ID2SYM(rb_intern("NODE_SPECIAL_REQUIRED_KEYWORD")));
-        }
-        return rb_ary_new_from_args(2, var_name(node->nd_vid), NEW_CHILD(ast, node->nd_value));
+        return rb_ary_new_from_args(2, var_name(RNODE_GASGN(node)->nd_vid), NEW_CHILD(ast_value, RNODE_GASGN(node)->nd_value));
       case NODE_CDECL:
-        if (node->nd_vid) {
-            return rb_ary_new_from_args(2, ID2SYM(node->nd_vid), NEW_CHILD(ast, node->nd_value));
+        if (RNODE_CDECL(node)->nd_vid) {
+            return rb_ary_new_from_args(2, ID2SYM(RNODE_CDECL(node)->nd_vid), NEW_CHILD(ast_value, RNODE_CDECL(node)->nd_value));
         }
-        return rb_ary_new_from_args(3, NEW_CHILD(ast, node->nd_else), ID2SYM(node->nd_else->nd_mid), NEW_CHILD(ast, node->nd_value));
+        return rb_ary_new_from_args(3, NEW_CHILD(ast_value, RNODE_CDECL(node)->nd_else), ID2SYM(RNODE_COLON2(RNODE_CDECL(node)->nd_else)->nd_mid), NEW_CHILD(ast_value, RNODE_CDECL(node)->nd_value));
       case NODE_OP_ASGN1:
-        return rb_ary_new_from_args(4, NEW_CHILD(ast, node->nd_recv),
-                                    ID2SYM(node->nd_mid),
-                                    NEW_CHILD(ast, node->nd_args->nd_head),
-                                    NEW_CHILD(ast, node->nd_args->nd_body));
+        return rb_ary_new_from_args(4, NEW_CHILD(ast_value, RNODE_OP_ASGN1(node)->nd_recv),
+                                    ID2SYM(RNODE_OP_ASGN1(node)->nd_mid),
+                                    NEW_CHILD(ast_value, RNODE_OP_ASGN1(node)->nd_index),
+                                    NEW_CHILD(ast_value, RNODE_OP_ASGN1(node)->nd_rvalue));
       case NODE_OP_ASGN2:
-        return rb_ary_new_from_args(5, NEW_CHILD(ast, node->nd_recv),
-                                    RBOOL(node->nd_next->nd_aid),
-                                    ID2SYM(node->nd_next->nd_vid),
-                                    ID2SYM(node->nd_next->nd_mid),
-                                    NEW_CHILD(ast, node->nd_value));
+        return rb_ary_new_from_args(5, NEW_CHILD(ast_value, RNODE_OP_ASGN2(node)->nd_recv),
+                                    RBOOL(RNODE_OP_ASGN2(node)->nd_aid),
+                                    ID2SYM(RNODE_OP_ASGN2(node)->nd_vid),
+                                    ID2SYM(RNODE_OP_ASGN2(node)->nd_mid),
+                                    NEW_CHILD(ast_value, RNODE_OP_ASGN2(node)->nd_value));
       case NODE_OP_ASGN_AND:
-        return rb_ary_new_from_args(3, NEW_CHILD(ast, node->nd_head), ID2SYM(idANDOP),
-                                    NEW_CHILD(ast, node->nd_value));
+        return rb_ary_new_from_args(3, NEW_CHILD(ast_value, RNODE_OP_ASGN_AND(node)->nd_head), ID2SYM(idANDOP),
+                                    NEW_CHILD(ast_value, RNODE_OP_ASGN_AND(node)->nd_value));
       case NODE_OP_ASGN_OR:
-        return rb_ary_new_from_args(3, NEW_CHILD(ast, node->nd_head), ID2SYM(idOROP),
-                                    NEW_CHILD(ast, node->nd_value));
+        return rb_ary_new_from_args(3, NEW_CHILD(ast_value, RNODE_OP_ASGN_OR(node)->nd_head), ID2SYM(idOROP),
+                                    NEW_CHILD(ast_value, RNODE_OP_ASGN_OR(node)->nd_value));
       case NODE_OP_CDECL:
-        return rb_ary_new_from_args(3, NEW_CHILD(ast, node->nd_head),
-                                    ID2SYM(node->nd_aid),
-                                    NEW_CHILD(ast, node->nd_value));
+        return rb_ary_new_from_args(3, NEW_CHILD(ast_value, RNODE_OP_CDECL(node)->nd_head),
+                                    ID2SYM(RNODE_OP_CDECL(node)->nd_aid),
+                                    NEW_CHILD(ast_value, RNODE_OP_CDECL(node)->nd_value));
       case NODE_CALL:
+        return rb_ary_new_from_args(3, NEW_CHILD(ast_value, RNODE_CALL(node)->nd_recv),
+                                    ID2SYM(RNODE_CALL(node)->nd_mid),
+                                    NEW_CHILD(ast_value, RNODE_CALL(node)->nd_args));
       case NODE_OPCALL:
+        return rb_ary_new_from_args(3, NEW_CHILD(ast_value, RNODE_OPCALL(node)->nd_recv),
+                                    ID2SYM(RNODE_OPCALL(node)->nd_mid),
+                                    NEW_CHILD(ast_value, RNODE_OPCALL(node)->nd_args));
       case NODE_QCALL:
-        return rb_ary_new_from_args(3, NEW_CHILD(ast, node->nd_recv),
-                                    ID2SYM(node->nd_mid),
-                                    NEW_CHILD(ast, node->nd_args));
+        return rb_ary_new_from_args(3, NEW_CHILD(ast_value, RNODE_QCALL(node)->nd_recv),
+                                    ID2SYM(RNODE_QCALL(node)->nd_mid),
+                                    NEW_CHILD(ast_value, RNODE_QCALL(node)->nd_args));
       case NODE_FCALL:
-        return rb_ary_new_from_args(2, ID2SYM(node->nd_mid),
-                                    NEW_CHILD(ast, node->nd_args));
+        return rb_ary_new_from_args(2, ID2SYM(RNODE_FCALL(node)->nd_mid),
+                                    NEW_CHILD(ast_value, RNODE_FCALL(node)->nd_args));
       case NODE_VCALL:
-        return rb_ary_new_from_args(1, ID2SYM(node->nd_mid));
+        return rb_ary_new_from_args(1, ID2SYM(RNODE_VCALL(node)->nd_mid));
       case NODE_SUPER:
-        return rb_ary_new_from_node_args(ast, 1, node->nd_args);
+        return rb_ary_new_from_node_args(ast_value, 1, RNODE_SUPER(node)->nd_args);
       case NODE_ZSUPER:
-        return rb_ary_new_from_node_args(ast, 0);
+        return rb_ary_new_from_node_args(ast_value, 0);
       case NODE_LIST:
-      case NODE_VALUES:
-        return dump_array(ast, node);
+        return dump_array(ast_value, RNODE_LIST(node));
       case NODE_ZLIST:
-        return rb_ary_new_from_node_args(ast, 0);
+        return rb_ary_new_from_node_args(ast_value, 0);
       case NODE_HASH:
-        return rb_ary_new_from_node_args(ast, 1, node->nd_head);
+        return rb_ary_new_from_node_args(ast_value, 1, RNODE_HASH(node)->nd_head);
       case NODE_YIELD:
-        return rb_ary_new_from_node_args(ast, 1, node->nd_head);
+        return rb_ary_new_from_node_args(ast_value, 1, RNODE_YIELD(node)->nd_head);
       case NODE_LVAR:
+        return rb_ary_new_from_args(1, var_name(RNODE_LVAR(node)->nd_vid));
       case NODE_DVAR:
-        return rb_ary_new_from_args(1, var_name(node->nd_vid));
+        return rb_ary_new_from_args(1, var_name(RNODE_DVAR(node)->nd_vid));
       case NODE_IVAR:
+        return rb_ary_new_from_args(1, ID2SYM(RNODE_IVAR(node)->nd_vid));
       case NODE_CONST:
+        return rb_ary_new_from_args(1, ID2SYM(RNODE_CONST(node)->nd_vid));
       case NODE_CVAR:
+        return rb_ary_new_from_args(1, ID2SYM(RNODE_CVAR(node)->nd_vid));
       case NODE_GVAR:
-        return rb_ary_new_from_args(1, ID2SYM(node->nd_vid));
+        return rb_ary_new_from_args(1, ID2SYM(RNODE_GVAR(node)->nd_vid));
       case NODE_NTH_REF:
-        snprintf(name, sizeof(name), "$%ld", node->nd_nth);
+        snprintf(name, sizeof(name), "$%ld", RNODE_NTH_REF(node)->nd_nth);
         return rb_ary_new_from_args(1, ID2SYM(rb_intern(name)));
       case NODE_BACK_REF:
         name[0] = '$';
-        name[1] = (char)node->nd_nth;
+        name[1] = (char)RNODE_BACK_REF(node)->nd_nth;
         name[2] = '\0';
         return rb_ary_new_from_args(1, ID2SYM(rb_intern(name)));
+      case NODE_MATCH:
+        return rb_ary_new_from_args(1, rb_node_regx_string_val(node));
       case NODE_MATCH2:
-        if (node->nd_args) {
-            return rb_ary_new_from_node_args(ast, 3, node->nd_recv, node->nd_value, node->nd_args);
+        if (RNODE_MATCH2(node)->nd_args) {
+            return rb_ary_new_from_node_args(ast_value, 3, RNODE_MATCH2(node)->nd_recv, RNODE_MATCH2(node)->nd_value, RNODE_MATCH2(node)->nd_args);
         }
-        return rb_ary_new_from_node_args(ast, 2, node->nd_recv, node->nd_value);
+        return rb_ary_new_from_node_args(ast_value, 2, RNODE_MATCH2(node)->nd_recv, RNODE_MATCH2(node)->nd_value);
       case NODE_MATCH3:
-        return rb_ary_new_from_node_args(ast, 2, node->nd_recv, node->nd_value);
-      case NODE_MATCH:
-      case NODE_LIT:
+        return rb_ary_new_from_node_args(ast_value, 2, RNODE_MATCH3(node)->nd_recv, RNODE_MATCH3(node)->nd_value);
       case NODE_STR:
       case NODE_XSTR:
-        return rb_ary_new_from_args(1, node->nd_lit);
+        return rb_ary_new_from_args(1, rb_node_str_string_val(node));
+      case NODE_INTEGER:
+        return rb_ary_new_from_args(1, rb_node_integer_literal_val(node));
+      case NODE_FLOAT:
+        return rb_ary_new_from_args(1, rb_node_float_literal_val(node));
+      case NODE_RATIONAL:
+        return rb_ary_new_from_args(1, rb_node_rational_literal_val(node));
+      case NODE_IMAGINARY:
+        return rb_ary_new_from_args(1, rb_node_imaginary_literal_val(node));
+      case NODE_REGX:
+        return rb_ary_new_from_args(1, rb_node_regx_string_val(node));
       case NODE_ONCE:
-        return rb_ary_new_from_node_args(ast, 1, node->nd_body);
+        return rb_ary_new_from_node_args(ast_value, 1, RNODE_ONCE(node)->nd_body);
       case NODE_DSTR:
       case NODE_DXSTR:
       case NODE_DREGX:
       case NODE_DSYM:
         {
-            NODE *n = node->nd_next;
+            struct RNode_LIST *n = RNODE_DSTR(node)->nd_next;
             VALUE head = Qnil, next = Qnil;
             if (n) {
-                head = NEW_CHILD(ast, n->nd_head);
-                next = NEW_CHILD(ast, n->nd_next);
+                head = NEW_CHILD(ast_value, n->nd_head);
+                next = NEW_CHILD(ast_value, n->nd_next);
             }
-            return rb_ary_new_from_args(3, node->nd_lit, head, next);
+            return rb_ary_new_from_args(3, rb_node_dstr_string_val(node), head, next);
         }
+      case NODE_SYM:
+        return rb_ary_new_from_args(1, rb_node_sym_string_val(node));
       case NODE_EVSTR:
-        return rb_ary_new_from_node_args(ast, 1, node->nd_body);
+        return rb_ary_new_from_node_args(ast_value, 1, RNODE_EVSTR(node)->nd_body);
       case NODE_ARGSCAT:
-        return rb_ary_new_from_node_args(ast, 2, node->nd_head, node->nd_body);
+        return rb_ary_new_from_node_args(ast_value, 2, RNODE_ARGSCAT(node)->nd_head, RNODE_ARGSCAT(node)->nd_body);
       case NODE_ARGSPUSH:
-        return rb_ary_new_from_node_args(ast, 2, node->nd_head, node->nd_body);
+        return rb_ary_new_from_node_args(ast_value, 2, RNODE_ARGSPUSH(node)->nd_head, RNODE_ARGSPUSH(node)->nd_body);
       case NODE_SPLAT:
-        return rb_ary_new_from_node_args(ast, 1, node->nd_head);
+        return rb_ary_new_from_node_args(ast_value, 1, RNODE_SPLAT(node)->nd_head);
       case NODE_BLOCK_PASS:
-        return rb_ary_new_from_node_args(ast, 2, node->nd_head, node->nd_body);
+        return rb_ary_new_from_node_args(ast_value, 2, RNODE_BLOCK_PASS(node)->nd_head, RNODE_BLOCK_PASS(node)->nd_body);
       case NODE_DEFN:
-        return rb_ary_new_from_args(2, ID2SYM(node->nd_mid), NEW_CHILD(ast, node->nd_defn));
+        return rb_ary_new_from_args(2, ID2SYM(RNODE_DEFN(node)->nd_mid), NEW_CHILD(ast_value, RNODE_DEFN(node)->nd_defn));
       case NODE_DEFS:
-        return rb_ary_new_from_args(3, NEW_CHILD(ast, node->nd_recv), ID2SYM(node->nd_mid), NEW_CHILD(ast, node->nd_defn));
+        return rb_ary_new_from_args(3, NEW_CHILD(ast_value, RNODE_DEFS(node)->nd_recv), ID2SYM(RNODE_DEFS(node)->nd_mid), NEW_CHILD(ast_value, RNODE_DEFS(node)->nd_defn));
       case NODE_ALIAS:
-        return rb_ary_new_from_node_args(ast, 2, node->nd_1st, node->nd_2nd);
+        return rb_ary_new_from_node_args(ast_value, 2, RNODE_ALIAS(node)->nd_1st, RNODE_ALIAS(node)->nd_2nd);
       case NODE_VALIAS:
-        return rb_ary_new_from_args(2, ID2SYM(node->nd_alias), ID2SYM(node->nd_orig));
+        return rb_ary_new_from_args(2, ID2SYM(RNODE_VALIAS(node)->nd_alias), ID2SYM(RNODE_VALIAS(node)->nd_orig));
       case NODE_UNDEF:
-        return rb_ary_new_from_node_args(ast, 1, node->nd_undef);
+        return rb_ary_new_from_args(1, dump_parser_array(ast_value, RNODE_UNDEF(node)->nd_undefs));
       case NODE_CLASS:
-        return rb_ary_new_from_node_args(ast, 3, node->nd_cpath, node->nd_super, node->nd_body);
+        return rb_ary_new_from_node_args(ast_value, 3, RNODE_CLASS(node)->nd_cpath, RNODE_CLASS(node)->nd_super, RNODE_CLASS(node)->nd_body);
       case NODE_MODULE:
-        return rb_ary_new_from_node_args(ast, 2, node->nd_cpath, node->nd_body);
+        return rb_ary_new_from_node_args(ast_value, 2, RNODE_MODULE(node)->nd_cpath, RNODE_MODULE(node)->nd_body);
       case NODE_SCLASS:
-        return rb_ary_new_from_node_args(ast, 2, node->nd_recv, node->nd_body);
+        return rb_ary_new_from_node_args(ast_value, 2, RNODE_SCLASS(node)->nd_recv, RNODE_SCLASS(node)->nd_body);
       case NODE_COLON2:
-        return rb_ary_new_from_args(2, NEW_CHILD(ast, node->nd_head), ID2SYM(node->nd_mid));
+        return rb_ary_new_from_args(2, NEW_CHILD(ast_value, RNODE_COLON2(node)->nd_head), ID2SYM(RNODE_COLON2(node)->nd_mid));
       case NODE_COLON3:
-        return rb_ary_new_from_args(1, ID2SYM(node->nd_mid));
+        return rb_ary_new_from_args(1, ID2SYM(RNODE_COLON3(node)->nd_mid));
       case NODE_DOT2:
       case NODE_DOT3:
       case NODE_FLIP2:
       case NODE_FLIP3:
-        return rb_ary_new_from_node_args(ast, 2, node->nd_beg, node->nd_end);
+        return rb_ary_new_from_node_args(ast_value, 2, RNODE_DOT2(node)->nd_beg, RNODE_DOT2(node)->nd_end);
       case NODE_SELF:
-        return rb_ary_new_from_node_args(ast, 0);
+        return rb_ary_new_from_node_args(ast_value, 0);
       case NODE_NIL:
-        return rb_ary_new_from_node_args(ast, 0);
+        return rb_ary_new_from_node_args(ast_value, 0);
       case NODE_TRUE:
-        return rb_ary_new_from_node_args(ast, 0);
+        return rb_ary_new_from_node_args(ast_value, 0);
       case NODE_FALSE:
-        return rb_ary_new_from_node_args(ast, 0);
+        return rb_ary_new_from_node_args(ast_value, 0);
       case NODE_ERRINFO:
-        return rb_ary_new_from_node_args(ast, 0);
+        return rb_ary_new_from_node_args(ast_value, 0);
       case NODE_DEFINED:
-        return rb_ary_new_from_node_args(ast, 1, node->nd_head);
+        return rb_ary_new_from_node_args(ast_value, 1, RNODE_DEFINED(node)->nd_head);
       case NODE_POSTEXE:
-        return rb_ary_new_from_node_args(ast, 1, node->nd_body);
+        return rb_ary_new_from_node_args(ast_value, 1, RNODE_POSTEXE(node)->nd_body);
       case NODE_ATTRASGN:
-        return rb_ary_new_from_args(3, NEW_CHILD(ast, node->nd_recv), ID2SYM(node->nd_mid), NEW_CHILD(ast, node->nd_args));
+        return rb_ary_new_from_args(3, NEW_CHILD(ast_value, RNODE_ATTRASGN(node)->nd_recv), ID2SYM(RNODE_ATTRASGN(node)->nd_mid), NEW_CHILD(ast_value, RNODE_ATTRASGN(node)->nd_args));
       case NODE_LAMBDA:
-        return rb_ary_new_from_node_args(ast, 1, node->nd_body);
+        return rb_ary_new_from_node_args(ast_value, 1, RNODE_LAMBDA(node)->nd_body);
       case NODE_OPT_ARG:
-        return rb_ary_new_from_node_args(ast, 2, node->nd_body, node->nd_next);
+        return rb_ary_new_from_node_args(ast_value, 2, RNODE_OPT_ARG(node)->nd_body, RNODE_OPT_ARG(node)->nd_next);
       case NODE_KW_ARG:
-        return rb_ary_new_from_node_args(ast, 2, node->nd_body, node->nd_next);
+        return rb_ary_new_from_node_args(ast_value, 2, RNODE_KW_ARG(node)->nd_body, RNODE_KW_ARG(node)->nd_next);
       case NODE_POSTARG:
-        if (NODE_NAMED_REST_P(node->nd_1st)) {
-            return rb_ary_new_from_node_args(ast, 2, node->nd_1st, node->nd_2nd);
+        if (NODE_NAMED_REST_P(RNODE_POSTARG(node)->nd_1st)) {
+            return rb_ary_new_from_node_args(ast_value, 2, RNODE_POSTARG(node)->nd_1st, RNODE_POSTARG(node)->nd_2nd);
         }
         return rb_ary_new_from_args(2, no_name_rest(),
-                                    NEW_CHILD(ast, node->nd_2nd));
+                                    NEW_CHILD(ast_value, RNODE_POSTARG(node)->nd_2nd));
       case NODE_ARGS:
         {
-            struct rb_args_info *ainfo = node->nd_ainfo;
+            struct rb_args_info *ainfo = &RNODE_ARGS(node)->nd_ainfo;
             return rb_ary_new_from_args(10,
                                         INT2NUM(ainfo->pre_args_num),
-                                        NEW_CHILD(ast, ainfo->pre_init),
-                                        NEW_CHILD(ast, ainfo->opt_args),
+                                        NEW_CHILD(ast_value, ainfo->pre_init),
+                                        NEW_CHILD(ast_value, (NODE *)ainfo->opt_args),
                                         var_name(ainfo->first_post_arg),
                                         INT2NUM(ainfo->post_args_num),
-                                        NEW_CHILD(ast, ainfo->post_init),
+                                        NEW_CHILD(ast_value, ainfo->post_init),
                                         (ainfo->rest_arg == NODE_SPECIAL_EXCESSIVE_COMMA
                                             ? ID2SYM(rb_intern("NODE_SPECIAL_EXCESSIVE_COMMA"))
                                             : var_name(ainfo->rest_arg)),
-                                        (ainfo->no_kwarg ? Qfalse : NEW_CHILD(ast, ainfo->kw_args)),
-                                        (ainfo->no_kwarg ? Qfalse : NEW_CHILD(ast, ainfo->kw_rest_arg)),
+                                        (ainfo->no_kwarg ? Qfalse : NEW_CHILD(ast_value, (NODE *)ainfo->kw_args)),
+                                        (ainfo->no_kwarg ? Qfalse : NEW_CHILD(ast_value, ainfo->kw_rest_arg)),
                                         var_name(ainfo->block_arg));
         }
       case NODE_SCOPE:
         {
-            rb_ast_id_table_t *tbl = node->nd_tbl;
+            rb_ast_id_table_t *tbl = RNODE_SCOPE(node)->nd_tbl;
             int i, size = tbl ? tbl->size : 0;
             VALUE locals = rb_ary_new_capa(size);
             for (i = 0; i < size; i++) {
                 rb_ary_push(locals, var_name(tbl->ids[i]));
             }
-            return rb_ary_new_from_args(3, locals, NEW_CHILD(ast, node->nd_args), NEW_CHILD(ast, node->nd_body));
+            return rb_ary_new_from_args(3, locals, NEW_CHILD(ast_value, (NODE *)RNODE_SCOPE(node)->nd_args), NEW_CHILD(ast_value, RNODE_SCOPE(node)->nd_body));
         }
       case NODE_ARYPTN:
         {
-            struct rb_ary_pattern_info *apinfo = node->nd_apinfo;
-            VALUE rest = rest_arg(ast, apinfo->rest_arg);
+            VALUE rest = rest_arg(ast_value, RNODE_ARYPTN(node)->rest_arg);
             return rb_ary_new_from_args(4,
-                                        NEW_CHILD(ast, node->nd_pconst),
-                                        NEW_CHILD(ast, apinfo->pre_args),
+                                        NEW_CHILD(ast_value, RNODE_ARYPTN(node)->nd_pconst),
+                                        NEW_CHILD(ast_value, RNODE_ARYPTN(node)->pre_args),
                                         rest,
-                                        NEW_CHILD(ast, apinfo->post_args));
+                                        NEW_CHILD(ast_value, RNODE_ARYPTN(node)->post_args));
         }
       case NODE_FNDPTN:
         {
-            struct rb_fnd_pattern_info *fpinfo = node->nd_fpinfo;
-            VALUE pre_rest = rest_arg(ast, fpinfo->pre_rest_arg);
-            VALUE post_rest = rest_arg(ast, fpinfo->post_rest_arg);
+            VALUE pre_rest = rest_arg(ast_value, RNODE_FNDPTN(node)->pre_rest_arg);
+            VALUE post_rest = rest_arg(ast_value, RNODE_FNDPTN(node)->post_rest_arg);
             return rb_ary_new_from_args(4,
-                                        NEW_CHILD(ast, node->nd_pconst),
+                                        NEW_CHILD(ast_value, RNODE_FNDPTN(node)->nd_pconst),
                                         pre_rest,
-                                        NEW_CHILD(ast, fpinfo->args),
+                                        NEW_CHILD(ast_value, RNODE_FNDPTN(node)->args),
                                         post_rest);
         }
       case NODE_HSHPTN:
         {
-            VALUE kwrest = node->nd_pkwrestarg == NODE_SPECIAL_NO_REST_KEYWORD ? ID2SYM(rb_intern("NODE_SPECIAL_NO_REST_KEYWORD")) :
-                                                                                 NEW_CHILD(ast, node->nd_pkwrestarg);
+            VALUE kwrest = RNODE_HSHPTN(node)->nd_pkwrestarg == NODE_SPECIAL_NO_REST_KEYWORD ? ID2SYM(rb_intern("NODE_SPECIAL_NO_REST_KEYWORD")) :
+                                                                                 NEW_CHILD(ast_value, RNODE_HSHPTN(node)->nd_pkwrestarg);
 
             return rb_ary_new_from_args(3,
-                                        NEW_CHILD(ast, node->nd_pconst),
-                                        NEW_CHILD(ast, node->nd_pkwargs),
+                                        NEW_CHILD(ast_value, RNODE_HSHPTN(node)->nd_pconst),
+                                        NEW_CHILD(ast_value, RNODE_HSHPTN(node)->nd_pkwargs),
                                         kwrest);
         }
+      case NODE_LINE:
+        return rb_ary_new_from_args(1, rb_node_line_lineno_val(node));
+      case NODE_FILE:
+        return rb_ary_new_from_args(1, rb_node_file_path_val(node));
+      case NODE_ENCODING:
+        return rb_ary_new_from_args(1, rb_node_encoding_val(node));
+      case NODE_ERROR:
+        return rb_ary_new_from_node_args(ast_value, 0);
       case NODE_ARGS_AUX:
       case NODE_LAST:
         break;
@@ -659,7 +748,250 @@ ast_node_children(rb_execution_context_t *ec, VALUE self)
     struct ASTNodeData *data;
     TypedData_Get_Struct(self, struct ASTNodeData, &rb_node_type, data);
 
-    return node_children(data->ast, data->node);
+    return node_children(data->ast_value, data->node);
+}
+
+static int
+null_loc_p(rb_code_location_t *loc)
+{
+    return (loc->beg_pos.lineno == 0 && loc->beg_pos.column == -1 && loc->end_pos.lineno == 0 && loc->end_pos.column == -1);
+}
+
+static VALUE
+location_new(rb_code_location_t *loc)
+{
+    VALUE obj;
+    struct ASTLocationData *data;
+
+    if (null_loc_p(loc)) return Qnil;
+
+    obj = TypedData_Make_Struct(rb_cLocation, struct ASTLocationData, &rb_location_type, data);
+    data->first_lineno = loc->beg_pos.lineno;
+    data->first_column = loc->beg_pos.column;
+    data->last_lineno = loc->end_pos.lineno;
+    data->last_column = loc->end_pos.column;
+
+    return obj;
+}
+
+static VALUE
+node_locations(VALUE ast_value, const NODE *node)
+{
+    enum node_type type = nd_type(node);
+    switch (type) {
+      case NODE_ALIAS:
+        return rb_ary_new_from_args(2,
+                                    location_new(nd_code_loc(node)),
+                                    location_new(&RNODE_ALIAS(node)->keyword_loc));
+      case NODE_AND:
+        return rb_ary_new_from_args(2,
+                                    location_new(nd_code_loc(node)),
+                                    location_new(&RNODE_AND(node)->operator_loc));
+      case NODE_BLOCK_PASS:
+        return rb_ary_new_from_args(2,
+                                    location_new(nd_code_loc(node)),
+                                    location_new(&RNODE_BLOCK_PASS(node)->operator_loc));
+      case NODE_BREAK:
+        return rb_ary_new_from_args(2,
+                                    location_new(nd_code_loc(node)),
+                                    location_new(&RNODE_BREAK(node)->keyword_loc));
+      case NODE_CASE:
+        return rb_ary_new_from_args(3,
+                                    location_new(nd_code_loc(node)),
+                                    location_new(&RNODE_CASE(node)->case_keyword_loc),
+                                    location_new(&RNODE_CASE(node)->end_keyword_loc));
+      case NODE_CASE2:
+        return rb_ary_new_from_args(3,
+                                    location_new(nd_code_loc(node)),
+                                    location_new(&RNODE_CASE2(node)->case_keyword_loc),
+                                    location_new(&RNODE_CASE2(node)->end_keyword_loc));
+      case NODE_CASE3:
+        return rb_ary_new_from_args(3,
+                                    location_new(nd_code_loc(node)),
+                                    location_new(&RNODE_CASE3(node)->case_keyword_loc),
+                                    location_new(&RNODE_CASE3(node)->end_keyword_loc));
+      case NODE_CLASS:
+        return rb_ary_new_from_args(4,
+                                    location_new(nd_code_loc(node)),
+                                    location_new(&RNODE_CLASS(node)->class_keyword_loc),
+                                    location_new(&RNODE_CLASS(node)->inheritance_operator_loc),
+                                    location_new(&RNODE_CLASS(node)->end_keyword_loc));
+      case NODE_COLON2:
+        return rb_ary_new_from_args(3,
+                                    location_new(nd_code_loc(node)),
+                                    location_new(&RNODE_COLON2(node)->delimiter_loc),
+                                    location_new(&RNODE_COLON2(node)->name_loc));
+      case NODE_COLON3:
+        return rb_ary_new_from_args(3,
+                                    location_new(nd_code_loc(node)),
+                                    location_new(&RNODE_COLON3(node)->delimiter_loc),
+                                    location_new(&RNODE_COLON3(node)->name_loc));
+      case NODE_DEFINED:
+        return rb_ary_new_from_args(2,
+                                    location_new(nd_code_loc(node)),
+                                    location_new(&RNODE_DEFINED(node)->keyword_loc));
+      case NODE_DOT2:
+        return rb_ary_new_from_args(2,
+                                    location_new(nd_code_loc(node)),
+                                    location_new(&RNODE_DOT2(node)->operator_loc));
+      case NODE_DOT3:
+        return rb_ary_new_from_args(2,
+                                    location_new(nd_code_loc(node)),
+                                    location_new(&RNODE_DOT3(node)->operator_loc));
+      case NODE_EVSTR:
+        return rb_ary_new_from_args(3,
+                                    location_new(nd_code_loc(node)),
+                                    location_new(&RNODE_EVSTR(node)->opening_loc),
+                                    location_new(&RNODE_EVSTR(node)->closing_loc));
+      case NODE_FLIP2:
+        return rb_ary_new_from_args(2,
+                                    location_new(nd_code_loc(node)),
+                                    location_new(&RNODE_FLIP2(node)->operator_loc));
+      case NODE_FLIP3:
+        return rb_ary_new_from_args(2,
+                                    location_new(nd_code_loc(node)),
+                                    location_new(&RNODE_FLIP3(node)->operator_loc));
+      case NODE_FOR:
+        return rb_ary_new_from_args(5,
+                                    location_new(nd_code_loc(node)),
+                                    location_new(&RNODE_FOR(node)->for_keyword_loc),
+                                    location_new(&RNODE_FOR(node)->in_keyword_loc),
+                                    location_new(&RNODE_FOR(node)->do_keyword_loc),
+                                    location_new(&RNODE_FOR(node)->end_keyword_loc));
+      case NODE_LAMBDA:
+        return rb_ary_new_from_args(4,
+                                    location_new(nd_code_loc(node)),
+                                    location_new(&RNODE_LAMBDA(node)->operator_loc),
+                                    location_new(&RNODE_LAMBDA(node)->opening_loc),
+                                    location_new(&RNODE_LAMBDA(node)->closing_loc));
+      case NODE_IF:
+        return rb_ary_new_from_args(4,
+                                    location_new(nd_code_loc(node)),
+                                    location_new(&RNODE_IF(node)->if_keyword_loc),
+                                    location_new(&RNODE_IF(node)->then_keyword_loc),
+                                    location_new(&RNODE_IF(node)->end_keyword_loc));
+      case NODE_IN:
+        return rb_ary_new_from_args(4,
+                                    location_new(nd_code_loc(node)),
+                                    location_new(&RNODE_IN(node)->in_keyword_loc),
+                                    location_new(&RNODE_IN(node)->then_keyword_loc),
+                                    location_new(&RNODE_IN(node)->operator_loc));
+      case NODE_MODULE:
+        return rb_ary_new_from_args(3,
+                                    location_new(nd_code_loc(node)),
+                                    location_new(&RNODE_MODULE(node)->module_keyword_loc),
+                                    location_new(&RNODE_MODULE(node)->end_keyword_loc));
+      case NODE_NEXT:
+        return rb_ary_new_from_args(2,
+                                    location_new(nd_code_loc(node)),
+                                    location_new(&RNODE_NEXT(node)->keyword_loc));
+      case NODE_OR:
+        return rb_ary_new_from_args(2,
+                                    location_new(nd_code_loc(node)),
+                                    location_new(&RNODE_OR(node)->operator_loc));
+      case NODE_OP_ASGN1:
+        return rb_ary_new_from_args(5,
+                                    location_new(nd_code_loc(node)),
+                                    location_new(&RNODE_OP_ASGN1(node)->call_operator_loc),
+                                    location_new(&RNODE_OP_ASGN1(node)->opening_loc),
+                                    location_new(&RNODE_OP_ASGN1(node)->closing_loc),
+                                    location_new(&RNODE_OP_ASGN1(node)->binary_operator_loc));
+      case NODE_OP_ASGN2:
+        return rb_ary_new_from_args(4,
+                                    location_new(nd_code_loc(node)),
+                                    location_new(&RNODE_OP_ASGN2(node)->call_operator_loc),
+                                    location_new(&RNODE_OP_ASGN2(node)->message_loc),
+                                    location_new(&RNODE_OP_ASGN2(node)->binary_operator_loc));
+      case NODE_POSTEXE:
+        return rb_ary_new_from_args(4,
+                                    location_new(nd_code_loc(node)),
+                                    location_new(&RNODE_POSTEXE(node)->keyword_loc),
+                                    location_new(&RNODE_POSTEXE(node)->opening_loc),
+                                    location_new(&RNODE_POSTEXE(node)->closing_loc));
+      case NODE_REDO:
+        return rb_ary_new_from_args(2,
+                                    location_new(nd_code_loc(node)),
+                                    location_new(&RNODE_REDO(node)->keyword_loc));
+      case NODE_REGX:
+        return rb_ary_new_from_args(4,
+                                    location_new(nd_code_loc(node)),
+                                    location_new(&RNODE_REGX(node)->opening_loc),
+                                    location_new(&RNODE_REGX(node)->content_loc),
+                                    location_new(&RNODE_REGX(node)->closing_loc));
+      case NODE_RETURN:
+        return rb_ary_new_from_args(2,
+                                    location_new(nd_code_loc(node)),
+                                    location_new(&RNODE_RETURN(node)->keyword_loc));
+
+      case NODE_SCLASS:
+        return rb_ary_new_from_args(4,
+                                    location_new(nd_code_loc(node)),
+                                    location_new(&RNODE_SCLASS(node)->class_keyword_loc),
+                                    location_new(&RNODE_SCLASS(node)->operator_loc),
+                                    location_new(&RNODE_SCLASS(node)->end_keyword_loc));
+
+      case NODE_SPLAT:
+        return rb_ary_new_from_args(2,
+                                    location_new(nd_code_loc(node)),
+                                    location_new(&RNODE_SPLAT(node)->operator_loc));
+      case NODE_SUPER:
+        return rb_ary_new_from_args(4,
+                                    location_new(nd_code_loc(node)),
+                                    location_new(&RNODE_SUPER(node)->keyword_loc),
+                                    location_new(&RNODE_SUPER(node)->lparen_loc),
+                                    location_new(&RNODE_SUPER(node)->rparen_loc));
+      case NODE_UNDEF:
+        return rb_ary_new_from_args(2,
+                                    location_new(nd_code_loc(node)),
+                                    location_new(&RNODE_UNDEF(node)->keyword_loc));
+      case NODE_UNLESS:
+        return rb_ary_new_from_args(4,
+                                    location_new(nd_code_loc(node)),
+                                    location_new(&RNODE_UNLESS(node)->keyword_loc),
+                                    location_new(&RNODE_UNLESS(node)->then_keyword_loc),
+                                    location_new(&RNODE_UNLESS(node)->end_keyword_loc));
+      case NODE_VALIAS:
+        return rb_ary_new_from_args(2,
+                                    location_new(nd_code_loc(node)),
+                                    location_new(&RNODE_VALIAS(node)->keyword_loc));
+      case NODE_WHEN:
+        return rb_ary_new_from_args(3,
+                                    location_new(nd_code_loc(node)),
+                                    location_new(&RNODE_WHEN(node)->keyword_loc),
+                                    location_new(&RNODE_WHEN(node)->then_keyword_loc));
+      case NODE_WHILE:
+        return rb_ary_new_from_args(3,
+                                    location_new(nd_code_loc(node)),
+                                    location_new(&RNODE_WHILE(node)->keyword_loc),
+                                    location_new(&RNODE_WHILE(node)->closing_loc));
+      case NODE_UNTIL:
+        return rb_ary_new_from_args(3,
+                                    location_new(nd_code_loc(node)),
+                                    location_new(&RNODE_UNTIL(node)->keyword_loc),
+                                    location_new(&RNODE_UNTIL(node)->closing_loc));
+      case NODE_YIELD:
+        return rb_ary_new_from_args(4,
+                                    location_new(nd_code_loc(node)),
+                                    location_new(&RNODE_YIELD(node)->keyword_loc),
+                                    location_new(&RNODE_YIELD(node)->lparen_loc),
+                                    location_new(&RNODE_YIELD(node)->rparen_loc));
+      case NODE_ARGS_AUX:
+      case NODE_LAST:
+        break;
+      default:
+        return rb_ary_new_from_args(1, location_new(nd_code_loc(node)));
+    }
+
+    rb_bug("node_locations: unknown node: %s", ruby_node_name(type));
+}
+
+static VALUE
+ast_node_locations(rb_execution_context_t *ec, VALUE self)
+{
+    struct ASTNodeData *data;
+    TypedData_Get_Struct(self, struct ASTNodeData, &rb_node_type, data);
+
+    return node_locations(data->ast_value, data->node);
 }
 
 static VALUE
@@ -699,6 +1031,42 @@ ast_node_last_column(rb_execution_context_t *ec, VALUE self)
 }
 
 static VALUE
+ast_node_all_tokens(rb_execution_context_t *ec, VALUE self)
+{
+    long i;
+    struct ASTNodeData *data;
+    rb_ast_t *ast;
+    rb_parser_ary_t *parser_tokens;
+    rb_parser_ast_token_t *parser_token;
+    VALUE str, loc, token, all_tokens;
+
+    TypedData_Get_Struct(self, struct ASTNodeData, &rb_node_type, data);
+    ast = rb_ruby_ast_data_get(data->ast_value);
+
+    parser_tokens = ast->node_buffer->tokens;
+    if (parser_tokens == NULL) {
+        return Qnil;
+    }
+
+    all_tokens = rb_ary_new2(parser_tokens->len);
+    for (i = 0; i < parser_tokens->len; i++) {
+        parser_token = parser_tokens->data[i];
+        str = rb_str_new(parser_token->str->ptr, parser_token->str->len);
+        loc = rb_ary_new_from_args(4,
+            INT2FIX(parser_token->loc.beg_pos.lineno),
+            INT2FIX(parser_token->loc.beg_pos.column),
+            INT2FIX(parser_token->loc.end_pos.lineno),
+            INT2FIX(parser_token->loc.end_pos.column)
+        );
+        token = rb_ary_new_from_args(4, INT2FIX(parser_token->id), ID2SYM(rb_intern(parser_token->type_name)), str, loc);
+        rb_ary_push(all_tokens, token);
+    }
+    rb_ary_freeze(all_tokens);
+
+    return all_tokens;
+}
+
+static VALUE
 ast_node_inspect(rb_execution_context_t *ec, VALUE self)
 {
     VALUE str;
@@ -722,10 +1090,66 @@ static VALUE
 ast_node_script_lines(rb_execution_context_t *ec, VALUE self)
 {
     struct ASTNodeData *data;
+    rb_ast_t *ast;
     TypedData_Get_Struct(self, struct ASTNodeData, &rb_node_type, data);
-    VALUE ret = data->ast->body.script_lines;
-    if (!RB_TYPE_P(ret, T_ARRAY)) return Qnil;
-    return ret;
+    ast = rb_ruby_ast_data_get(data->ast_value);
+    rb_parser_ary_t *ret = ast->body.script_lines;
+    return rb_parser_build_script_lines_from(ret);
+}
+
+static VALUE
+ast_location_first_lineno(rb_execution_context_t *ec, VALUE self)
+{
+    struct ASTLocationData *data;
+    TypedData_Get_Struct(self, struct ASTLocationData, &rb_location_type, data);
+
+    return INT2NUM(data->first_lineno);
+}
+
+static VALUE
+ast_location_first_column(rb_execution_context_t *ec, VALUE self)
+{
+    struct ASTLocationData *data;
+    TypedData_Get_Struct(self, struct ASTLocationData, &rb_location_type, data);
+
+    return INT2NUM(data->first_column);
+}
+
+static VALUE
+ast_location_last_lineno(rb_execution_context_t *ec, VALUE self)
+{
+    struct ASTLocationData *data;
+    TypedData_Get_Struct(self, struct ASTLocationData, &rb_location_type, data);
+
+    return INT2NUM(data->last_lineno);
+}
+
+static VALUE
+ast_location_last_column(rb_execution_context_t *ec, VALUE self)
+{
+    struct ASTLocationData *data;
+    TypedData_Get_Struct(self, struct ASTLocationData, &rb_location_type, data);
+
+    return INT2NUM(data->last_column);
+}
+
+static VALUE
+ast_location_inspect(rb_execution_context_t *ec, VALUE self)
+{
+    VALUE str;
+    VALUE cname;
+    struct ASTLocationData *data;
+    TypedData_Get_Struct(self, struct ASTLocationData, &rb_location_type, data);
+
+    cname = rb_class_path(rb_obj_class(self));
+    str = rb_str_new2("#<");
+
+    rb_str_append(str, cname);
+    rb_str_catf(str, ":@%d:%d-%d:%d>",
+                data->first_lineno, data->first_column,
+                data->last_lineno, data->last_column);
+
+    return str;
 }
 
 #include "ast.rbinc"
@@ -735,5 +1159,7 @@ Init_ast(void)
 {
     rb_mAST = rb_define_module_under(rb_cRubyVM, "AbstractSyntaxTree");
     rb_cNode = rb_define_class_under(rb_mAST, "Node", rb_cObject);
+    rb_cLocation = rb_define_class_under(rb_mAST, "Location", rb_cObject);
     rb_undef_alloc_func(rb_cNode);
+    rb_undef_alloc_func(rb_cLocation);
 }
diff --git a/ast.rb b/ast.rb
index f866bd23e5..6380621780 100644
--- a/ast.rb
+++ b/ast.rb
@@ -13,28 +13,53 @@
 # access children nodes by name, etc.
 #
 # If you are looking for a stable API or an API working under multiple Ruby
-# implementations, consider using the _parser_ gem or Ripper. If you would
-# like to make RubyVM::AbstractSyntaxTree stable, please join the discussion
-# at https://bugs.ruby-lang.org/issues/14844.
+# implementations, consider using the _prism_ gem, which is the official
+# Ruby API to parse Ruby code.
 #
 module RubyVM::AbstractSyntaxTree
 
   #  call-seq:
-  #     RubyVM::AbstractSyntaxTree.parse(string) -> RubyVM::AbstractSyntaxTree::Node
+  #     RubyVM::AbstractSyntaxTree.parse(string, keep_script_lines: RubyVM.keep_script_lines, error_tolerant: false, keep_tokens: false) -> RubyVM::AbstractSyntaxTree::Node
   #
   #  Parses the given _string_ into an abstract syntax tree,
   #  returning the root node of that tree.
   #
-  #  SyntaxError is raised if the given _string_ is invalid syntax.
-  #
   #    RubyVM::AbstractSyntaxTree.parse("x = 1 + 2")
   #    # => #<RubyVM::AbstractSyntaxTree::Node:SCOPE@1:0-1:9>
-  def self.parse string, keep_script_lines: false
-    Primitive.ast_s_parse string, keep_script_lines
+  #
+  #  If <tt>keep_script_lines: true</tt> option is provided, the text of the parsed
+  #  source is associated with nodes and is available via Node#script_lines.
+  #
+  #  If <tt>keep_tokens: true</tt> option is provided, Node#tokens are populated.
+  #
+  #  SyntaxError is raised if the given _string_ is invalid syntax. To overwrite this
+  #  behavior, <tt>error_tolerant: true</tt> can be provided. In this case, the parser
+  #  will produce a tree where expressions with syntax errors would be represented by
+  #  Node with <tt>type=:ERROR</tt>.
+  #
+  #     root = RubyVM::AbstractSyntaxTree.parse("x = 1; p(x; y=2")
+  #     # <internal:ast>:33:in `parse': syntax error, unexpected ';', expecting ')' (SyntaxError)
+  #     # x = 1; p(x; y=2
+  #     #           ^
+  #
+  #     root = RubyVM::AbstractSyntaxTree.parse("x = 1; p(x; y=2", error_tolerant: true)
+  #     # (SCOPE@1:0-1:15
+  #     #  tbl: [:x, :y]
+  #     #  args: nil
+  #     #  body: (BLOCK@1:0-1:15 (LASGN@1:0-1:5 :x (LIT@1:4-1:5 1)) (ERROR@1:7-1:11) (LASGN@1:12-1:15 :y (LIT@1:14-1:15 2))))
+  #     root.children.last.children
+  #     # [(LASGN@1:0-1:5 :x (LIT@1:4-1:5 1)),
+  #     #  (ERROR@1:7-1:11),
+  #     #  (LASGN@1:12-1:15 :y (LIT@1:14-1:15 2))]
+  #
+  #  Note that parsing continues even after the errored expression.
+  #
+  def self.parse string, keep_script_lines: RubyVM.keep_script_lines, error_tolerant: false, keep_tokens: false
+    Primitive.ast_s_parse string, keep_script_lines, error_tolerant, keep_tokens
   end
 
   #  call-seq:
-  #     RubyVM::AbstractSyntaxTree.parse_file(pathname) -> RubyVM::AbstractSyntaxTree::Node
+  #     RubyVM::AbstractSyntaxTree.parse_file(pathname, keep_script_lines: RubyVM.keep_script_lines, error_tolerant: false, keep_tokens: false) -> RubyVM::AbstractSyntaxTree::Node
   #
   #   Reads the file from _pathname_, then parses it like ::parse,
   #   returning the root node of the abstract syntax tree.
@@ -44,13 +69,15 @@ module RubyVM::AbstractSyntaxTree
   #
   #     RubyVM::AbstractSyntaxTree.parse_file("my-app/app.rb")
   #     # => #<RubyVM::AbstractSyntaxTree::Node:SCOPE@1:0-31:3>
-  def self.parse_file pathname, keep_script_lines: false
-    Primitive.ast_s_parse_file pathname, keep_script_lines
+  #
+  #   See ::parse for explanation of keyword argument meaning and usage.
+  def self.parse_file pathname, keep_script_lines: RubyVM.keep_script_lines, error_tolerant: false, keep_tokens: false
+    Primitive.ast_s_parse_file pathname, keep_script_lines, error_tolerant, keep_tokens
   end
 
   #  call-seq:
-  #     RubyVM::AbstractSyntaxTree.of(proc)   -> RubyVM::AbstractSyntaxTree::Node
-  #     RubyVM::AbstractSyntaxTree.of(method) -> RubyVM::AbstractSyntaxTree::Node
+  #     RubyVM::AbstractSyntaxTree.of(proc, keep_script_lines: RubyVM.keep_script_lines, error_tolerant: false, keep_tokens: false)   -> RubyVM::AbstractSyntaxTree::Node
+  #     RubyVM::AbstractSyntaxTree.of(method, keep_script_lines: RubyVM.keep_script_lines, error_tolerant: false, keep_tokens: false) -> RubyVM::AbstractSyntaxTree::Node
   #
   #   Returns AST nodes of the given _proc_ or _method_.
   #
@@ -63,8 +90,25 @@ module RubyVM::AbstractSyntaxTree
   #
   #     RubyVM::AbstractSyntaxTree.of(method(:hello))
   #     # => #<RubyVM::AbstractSyntaxTree::Node:SCOPE@1:0-3:3>
-  def self.of body, keep_script_lines: false
-    Primitive.ast_s_of body, keep_script_lines
+  #
+  #   See ::parse for explanation of keyword argument meaning and usage.
+  def self.of body, keep_script_lines: RubyVM.keep_script_lines, error_tolerant: false, keep_tokens: false
+    Primitive.ast_s_of body, keep_script_lines, error_tolerant, keep_tokens
+  end
+
+  #  call-seq:
+  #     RubyVM::AbstractSyntaxTree.node_id_for_backtrace_location(backtrace_location)   -> integer
+  #
+  #   Returns the node id for the given backtrace location.
+  #
+  #     begin
+  #       raise
+  #     rescue =>  e
+  #       loc = e.backtrace_locations.first
+  #       RubyVM::AbstractSyntaxTree.node_id_for_backtrace_location(loc)
+  #     end # => 0
+  def self.node_id_for_backtrace_location backtrace_location
+    Primitive.node_id_for_backtrace_location backtrace_location
   end
 
   # RubyVM::AbstractSyntaxTree::Node instances are created by parse methods in
@@ -122,6 +166,47 @@ module RubyVM::AbstractSyntaxTree
     end
 
     #  call-seq:
+    #     node.tokens -> array
+    #
+    #  Returns tokens corresponding to the location of the node.
+    #  Returns +nil+ if +keep_tokens+ is not enabled when #parse method is called.
+    #
+    #    root = RubyVM::AbstractSyntaxTree.parse("x = 1 + 2", keep_tokens: true)
+    #    root.tokens # => [[0, :tIDENTIFIER, "x", [1, 0, 1, 1]], [1, :tSP, " ", [1, 1, 1, 2]], ...]
+    #    root.tokens.map{_1[2]}.join # => "x = 1 + 2"
+    #
+    #  Token is an array of:
+    #
+    #  - id
+    #  - token type
+    #  - source code text
+    #  - location [ first_lineno, first_column, last_lineno, last_column ]
+    def tokens
+      return nil unless all_tokens
+
+      all_tokens.each_with_object([]) do |token, a|
+        loc = token.last
+        if ([first_lineno, first_column] <=> [loc[0], loc[1]]) <= 0 &&
+           ([last_lineno, last_column]   <=> [loc[2], loc[3]]) >= 0
+           a << token
+        end
+      end
+    end
+
+    #  call-seq:
+    #     node.all_tokens -> array
+    #
+    #  Returns all tokens for the input script regardless the receiver node.
+    #  Returns +nil+ if +keep_tokens+ is not enabled when #parse method is called.
+    #
+    #    root = RubyVM::AbstractSyntaxTree.parse("x = 1 + 2", keep_tokens: true)
+    #    root.all_tokens # => [[0, :tIDENTIFIER, "x", [1, 0, 1, 1]], [1, :tSP, " ", [1, 1, 1, 2]], ...]
+    #    root.children[-1].all_tokens # => [[0, :tIDENTIFIER, "x", [1, 0, 1, 1]], [1, :tSP, " ", [1, 1, 1, 2]], ...]
+    def all_tokens
+      Primitive.ast_node_all_tokens
+    end
+
+    #  call-seq:
     #     node.children -> array
     #
     #  Returns AST nodes under this one.  Each kind of node
@@ -179,12 +264,69 @@ module RubyVM::AbstractSyntaxTree
       lines = script_lines
       if lines
         lines = lines[first_lineno - 1 .. last_lineno - 1]
-        lines[-1] = lines[-1][0...last_column]
-        lines[0] = lines[0][first_column..-1]
+        lines[-1] = lines[-1].byteslice(0...last_column)
+        lines[0] = lines[0].byteslice(first_column..-1)
         lines.join
       else
         nil
       end
     end
+
+    #  call-seq:
+    #     node.locations -> array
+    #
+    #  Returns location objects associated with the AST node.
+    #  The returned array contains RubyVM::AbstractSyntaxTree::Location.
+    def locations
+      Primitive.ast_node_locations
+    end
+  end
+
+  # RubyVM::AbstractSyntaxTree::Location instances are created by
+  # RubyVM::AbstractSyntaxTree::Node#locations.
+  #
+  # This class is MRI specific.
+  #
+  class Location
+
+    #  call-seq:
+    #     location.first_lineno -> integer
+    #
+    #  The line number in the source code where this AST's text began.
+    def first_lineno
+      Primitive.ast_location_first_lineno
+    end
+
+    #  call-seq:
+    #     location.first_column -> integer
+    #
+    #  The column number in the source code where this AST's text began.
+    def first_column
+      Primitive.ast_location_first_column
+    end
+
+    #  call-seq:
+    #     location.last_lineno -> integer
+    #
+    #  The line number in the source code where this AST's text ended.
+    def last_lineno
+      Primitive.ast_location_last_lineno
+    end
+
+    #  call-seq:
+    #     location.last_column -> integer
+    #
+    #  The column number in the source code where this AST's text ended.
+    def last_column
+      Primitive.ast_location_last_column
+    end
+
+    #  call-seq:
+    #     location.inspect -> string
+    #
+    #  Returns debugging information about this location as a string.
+    def inspect
+      Primitive.ast_location_inspect
+    end
   end
 end
diff --git a/autogen.sh b/autogen.sh
index f8cdf3c0c1..6cbc5dddab 100755
--- a/autogen.sh
+++ b/autogen.sh
@@ -1,17 +1,22 @@
 #!/bin/sh
 
+# Clear PWD to force commands to recompute working directory
 PWD=
+
+# Figure out the source directory for this script
+# configure.ac should be in the same place
 case "$0" in
-*/*) srcdir=`dirname $0`;;
-*) srcdir="";;
+    */* )  srcdir=`dirname "$0"` ;; # Called with path
+    *   )  srcdir="";; # Otherwise
 esac
 
-symlink='--install --symlink'
+# If install-only is explicitly requested, disable symlink flags
 case " $* " in
-    *" -i "*|*" --install "*)
-        # reset to copy missing standard auxiliary files, instead of symlinks
-        symlink=
-        ;;
+    *" -i "* | *" --install"* ) symlink_flags="" ;;
+    *                         ) symlink_flags="--install --symlink" ;;
 esac
 
-exec ${AUTORECONF:-autoreconf} ${symlink} "$@" ${srcdir:+"$srcdir"}
+exec ${AUTORECONF:-autoreconf} \
+     $symlink_flags \
+     "$@" \
+     $srcdir
diff --git a/basictest/test.rb b/basictest/test.rb
index 95875b52a6..711e4f4ab3 100755
--- a/basictest/test.rb
+++ b/basictest/test.rb
@@ -879,7 +879,7 @@ $x.sort!{|a,b| b-a}		# reverse sort
 test_ok($x == [7,5,3,2,1])
 
 # split test
-$x = "The Book of Mormon"
+$x = +"The Book of Mormon"
 test_ok($x.split(//).reverse!.join == $x.reverse)
 test_ok($x.reverse == $x.reverse!)
 test_ok("1 byte string".split(//).reverse.join(":") == "g:n:i:r:t:s: :e:t:y:b: :1")
@@ -1643,7 +1643,7 @@ test_ok(/^(?:ab+)+/ =~ "ababb" && $& == "ababb")
 test_ok(/(\s+\d+){2}/ =~ " 1 2" && $& == " 1 2")
 test_ok(/(?:\s+\d+){2}/ =~ " 1 2" && $& == " 1 2")
 
-$x = <<END;
+$x = +<<END;
 ABCD
 ABCD
 END
@@ -1682,12 +1682,12 @@ test_ok(?a == ?a)
 test_ok(?\C-a == "\1")
 test_ok(?\M-a == "\341")
 test_ok(?\M-\C-a == "\201")
-test_ok("a".upcase![0] == ?A)
-test_ok("A".downcase![0] == ?a)
-test_ok("abc".tr!("a-z", "A-Z") == "ABC")
-test_ok("aabbcccc".tr_s!("a-z", "A-Z") == "ABC")
-test_ok("abcc".squeeze!("a-z") == "abc")
-test_ok("abcd".delete!("bc") == "ad")
+test_ok("a".dup.upcase![0] == ?A)
+test_ok("A".dup.downcase![0] == ?a)
+test_ok("abc".dup.tr!("a-z", "A-Z") == "ABC")
+test_ok("aabbcccc".dup.tr_s!("a-z", "A-Z") == "ABC")
+test_ok("abcc".dup.squeeze!("a-z") == "abc")
+test_ok("abcd".dup.delete!("bc") == "ad")
 
 $x = "abcdef"
 $y = [ ?a, ?b, ?c, ?d, ?e, ?f ]
@@ -1700,7 +1700,7 @@ $x.each_byte {|i|
 }
 test_ok(!$bad)
 
-s = "a string"
+s = +"a string"
 s[0..s.size]="another string"
 test_ok(s == "another string")
 
diff --git a/benchmark/README.md b/benchmark/README.md
index c222164be3..9f9192685e 100644
--- a/benchmark/README.md
+++ b/benchmark/README.md
@@ -27,16 +27,19 @@ benchmark-driver benchmark/*.yml
 See also:
 
 ```console
+benchmark-driver --help
 Usage: benchmark-driver [options] RUBY|YAML...
-    -r, --runner TYPE                Specify runner type: ips, time, memory, once (default: ips)
-    -o, --output TYPE                Specify output type: compare, simple, markdown, record (default: compare)
+    -r, --runner TYPE                Specify runner type: ips, time, memory, once, block (default: ips)
+    -o, --output TYPE                Specify output type: compare, simple, markdown, record, all (default: compare)
     -e, --executables EXECS          Ruby executables (e1::path1 arg1; e2::path2 arg2;...)
         --rbenv VERSIONS             Ruby executables in rbenv (x.x.x arg1;y.y.y arg2;...)
         --repeat-count NUM           Try benchmark NUM times and use the fastest result or the worst memory usage
         --repeat-result TYPE         Yield "best", "average" or "worst" result with --repeat-count (default: best)
+        --alternate                  Alternate executables instead of running the same executable in a row with --repeat-count
         --bundler                    Install and use gems specified in Gemfile
         --filter REGEXP              Filter out benchmarks with given regexp
         --run-duration SECONDS       Warmup estimates loop_count to run for this duration (default: 3)
+        --timeout SECONDS            Timeout ruby command execution with timeout(1)
     -v, --verbose                    Verbose mode. Multiple -v options increase visibility (max: 2)
 ```
 
diff --git a/benchmark/app_aobench.rb b/benchmark/app_aobench.rb
index 16296af12b..c1546e08ab 100644
--- a/benchmark/app_aobench.rb
+++ b/benchmark/app_aobench.rb
@@ -151,7 +151,7 @@ def clamp(f)
   i.to_i
 end
 
-def otherBasis(basis, n)
+def orthoBasis(basis, n)
   basis[2] = Vec.new(n.x, n.y, n.z)
   basis[1] = Vec.new(0.0, 0.0, 0.0)
 
@@ -183,7 +183,7 @@ class Scene
 
   def ambient_occlusion(isect)
     basis = Array.new
-    otherBasis(basis, isect.n)
+    orthoBasis(basis, isect.n)
 
     ntheta    = NAO_SAMPLES
     nphi      = NAO_SAMPLES
diff --git a/benchmark/app_fib.rb b/benchmark/app_fib.rb
index 34a7b2e725..e61bc8aa32 100644
--- a/benchmark/app_fib.rb
+++ b/benchmark/app_fib.rb
@@ -1,4 +1,4 @@
-def fib n
+def fib(n)
   if n < 3
     1
   else
diff --git a/benchmark/array_large_literal.yml b/benchmark/array_large_literal.yml
new file mode 100644
index 0000000000..423d68391f
--- /dev/null
+++ b/benchmark/array_large_literal.yml
@@ -0,0 +1,19 @@
+prelude: |
+  def def_array(size)
+    Object.class_eval(<<-END)
+      def array_#{size}
+        x = 1
+        [#{(['x'] * size).join(',')}]
+      end
+    END
+  end
+  def_array(100)
+  def_array(1000)
+  def_array(10000)
+  def_array(100000)
+benchmark:
+  array_100: array_100
+  array_1000: array_1000
+  array_10000: array_10000
+  array_100000: array_100000
+
diff --git a/benchmark/array_sort_int.yml b/benchmark/array_sort_int.yml
new file mode 100644
index 0000000000..7b9027ebf7
--- /dev/null
+++ b/benchmark/array_sort_int.yml
@@ -0,0 +1,15 @@
+prelude: |
+  ary2 = 2.times.to_a.shuffle
+  ary10 = 10.times.to_a.shuffle
+  ary100 = 100.times.to_a.shuffle
+  ary1000 = 1000.times.to_a.shuffle
+  ary10000 = 10000.times.to_a.shuffle
+
+benchmark:
+  ary2.sort: ary2.sort
+  ary10.sort: ary10.sort
+  ary100.sort: ary100.sort
+  ary1000.sort: ary1000.sort
+  ary10000.sort: ary10000.sort
+
+loop_count: 10000
diff --git a/benchmark/buffer_each.yml b/benchmark/buffer_each.yml
new file mode 100644
index 0000000000..417941104e
--- /dev/null
+++ b/benchmark/buffer_each.yml
@@ -0,0 +1,27 @@
+prelude: |
+  # frozen_string_literal: true
+  Warning[:experimental] = false
+  string = "The quick brown fox jumped over the lazy dog."
+  array = string.bytes
+  buffer = IO::Buffer.for(string)
+benchmark:
+  string.each_byte: |
+    upcased = String.new
+    string.each_byte do |byte|
+      upcased << (byte ^ 32)
+    end
+  array.each: |
+    upcased = String.new
+    array.each do |byte|
+      upcased << (byte ^ 32)
+    end
+  buffer.each: |
+    upcased = String.new
+    buffer.each(:U8) do |offset, byte|
+      upcased << (byte ^ 32)
+    end
+  buffer.each_byte: |
+    upcased = String.new
+    buffer.each_byte do |byte|
+      upcased << (byte ^ 32)
+    end
diff --git a/benchmark/buffer_get.yml b/benchmark/buffer_get.yml
index e375dcf85d..9e1f99d64e 100644
--- a/benchmark/buffer_get.yml
+++ b/benchmark/buffer_get.yml
@@ -1,9 +1,25 @@
+prelude: |
+  # frozen_string_literal: true
+  Warning[:experimental] = false
+  string = "The quick brown fox jumped over the lazy dog."
+  buffer = IO::Buffer.for(string)
+  format = [:U32, :U32, :U32, :U32]
 benchmark:
-  - name: buffer.get
-    prelude: buffer = IO::Buffer.new(32, IO::Buffer::MAPPED)
-    script: buffer.get(:U32, 0)
-    loop_count: 20000000
-  - name: string.unpack
-    prelude: string = "\0" * 32
-    script: string.unpack("C")
-    loop_count: 20000000
+  string.unpack1: |
+    [
+      string.unpack1("N"),
+      string.unpack1("N", offset: 4),
+      string.unpack1("N", offset: 8),
+      string.unpack1("N", offset: 12),
+    ]
+  buffer.get_value: |
+    [
+      buffer.get_value(:U32, 0),
+      buffer.get_value(:U32, 4),
+      buffer.get_value(:U32, 8),
+      buffer.get_value(:U32, 12),
+    ]
+  buffer.get_values: |
+    buffer.get_values(format, 0)
+  string.unpack: |
+    string.unpack("NNNN")
diff --git a/benchmark/cgi_escape_html.yml b/benchmark/cgi_escape_html.yml
index af6abd08ac..655be9d7d8 100644
--- a/benchmark/cgi_escape_html.yml
+++ b/benchmark/cgi_escape_html.yml
@@ -1,32 +1,23 @@
-prelude: require 'cgi/escape'
+prelude: |
+  # frozen_string_literal: true
+  require 'cgi/escape'
 benchmark:
-  - name: escape_html_blank
-    prelude: str = ""
-    script: CGI.escapeHTML(str)
+  - script: CGI.escapeHTML("")
     loop_count: 20000000
-  - name: escape_html_short_none
-    prelude: str = "abcde"
-    script: CGI.escapeHTML(str)
+  - script: CGI.escapeHTML("abcde")
     loop_count: 20000000
-  - name: escape_html_short_one
-    prelude: str = "abcd<"
-    script: CGI.escapeHTML(str)
+  - script: CGI.escapeHTML("abcd<")
     loop_count: 20000000
-  - name: escape_html_short_all
-    prelude: str = "'&\"<>"
-    script: CGI.escapeHTML(str)
+  - script: CGI.escapeHTML("'&\"<>")
     loop_count: 5000000
-  - name: escape_html_long_none
-    prelude: str = "abcde" * 300
-    script: CGI.escapeHTML(str)
+  - prelude: long_no_escape = "abcde" * 300
+    script: CGI.escapeHTML(long_no_escape)
     loop_count: 1000000
-  - name: escape_html_long_all
-    prelude: str = "'&\"<>" * 10
-    script: CGI.escapeHTML(str)
+  - prelude: long_all_escape = "'&\"<>" * 10
+    script: CGI.escapeHTML(long_all_escape)
     loop_count: 1000000
-  - name: escape_html_real
-    prelude: | # http://example.com/
-      str = <<~HTML
+  - prelude: | # http://example.com/
+      example_html = <<~HTML
         <body>
         <div>
             <h1>Example Domain</h1>
@@ -36,5 +27,5 @@ benchmark:
         </div>
         </body>
       HTML
-    script: CGI.escapeHTML(str)
+    script: CGI.escapeHTML(example_html)
     loop_count: 1000000
diff --git a/benchmark/class_superclass.yml b/benchmark/class_superclass.yml
new file mode 100644
index 0000000000..847ff811f1
--- /dev/null
+++ b/benchmark/class_superclass.yml
@@ -0,0 +1,23 @@
+prelude: |
+  class SimpleClass; end
+  class OneModuleClass
+    1.times { include Module.new }
+  end
+  class MediumClass
+    10.times { include Module.new }
+  end
+  class LargeClass
+    100.times { include Module.new }
+  end
+benchmark:
+  object_class_superclass: |
+    Object.superclass
+  simple_class_superclass: |
+    SimpleClass.superclass
+  one_module_class: |
+    OneModuleClass.superclass
+  medium_class_superclass: |
+    MediumClass.superclass
+  large_class_superclass: |
+    LargeClass.superclass
+loop_count: 20000000
diff --git a/benchmark/enum_minmax.yml b/benchmark/enum_minmax.yml
new file mode 100644
index 0000000000..9d01731abb
--- /dev/null
+++ b/benchmark/enum_minmax.yml
@@ -0,0 +1,25 @@
+prelude: |
+  set2 = 2.times.to_a.shuffle.to_set
+  set10 = 10.times.to_a.shuffle.to_set
+  set100 = 100.times.to_a.shuffle.to_set
+  set1000 = 1000.times.to_a.shuffle.to_set
+  set10000 = 10000.times.to_a.shuffle.to_set
+
+benchmark:
+  set2.min: set2.min
+  set10.min: set10.min
+  set100.min: set100.min
+  set1000.min: set1000.min
+  set10000.min: set10000.min
+  set2.max: set2.max
+  set10.max: set10.max
+  set100.max: set100.max
+  set1000.max: set1000.max
+  set10000.max: set10000.max
+  set2.minmax: set2.minmax
+  set10.minmax: set10.minmax
+  set100.minmax: set100.minmax
+  set1000.minmax: set1000.minmax
+  set10000.minmax: set10000.minmax
+
+loop_count: 10000
diff --git a/benchmark/enum_sort.yml b/benchmark/enum_sort.yml
new file mode 100644
index 0000000000..6f26e748c6
--- /dev/null
+++ b/benchmark/enum_sort.yml
@@ -0,0 +1,15 @@
+prelude: |
+  set2 = 2.times.to_a.shuffle.to_set
+  set10 = 10.times.to_a.shuffle.to_set
+  set100 = 100.times.to_a.shuffle.to_set
+  set1000 = 1000.times.to_a.shuffle.to_set
+  set10000 = 10000.times.to_a.shuffle.to_set
+
+benchmark:
+  set2.sort_by: set2.sort_by { 0 }
+  set10.sort_by: set10.sort_by { 0 }
+  set100.sort_by: set100.sort_by { 0 }
+  set1000.sort_by: set1000.sort_by { 0 }
+  set10000.sort_by: set10000.sort_by { 0 }
+
+loop_count: 10000
diff --git a/benchmark/enum_sort_by.yml b/benchmark/enum_sort_by.yml
new file mode 100644
index 0000000000..d386353888
--- /dev/null
+++ b/benchmark/enum_sort_by.yml
@@ -0,0 +1,53 @@
+prelude: |
+  array_length = 2
+  fixnum_array2 = array_length.times.to_a.map {rand(10000)}
+  float_array2 = array_length.times.to_a.map {rand(10000.0).to_f}
+  string_array2 = array_length.times.to_a.map {"r" * rand(1..10000)}
+  mix_array2 = array_length.times.to_a.map {if rand(1..100) <= 50 then rand(1..10000).to_f else rand(1..10000) end}
+  all_zero_array2 =array_length.times.to_a.map {0}
+
+  array_length = 10
+  fixnum_array10 = array_length.times.to_a.map {rand(10000)}
+  float_array10 = array_length.times.to_a.map {rand(10000.0).to_f}
+  string_array10 = array_length.times.to_a.map {"r" * rand(1..10000)}
+  mix_array10 = array_length.times.to_a.map {if rand(1..100) <= 50 then rand(1..10000).to_f else rand(1..10000) end}
+  all_zero_array10 =array_length.times.to_a.map {0}
+
+  array_length = 1000
+  fixnum_array1000 = array_length.times.to_a.map {rand(10000)}
+  float_array1000 = array_length.times.to_a.map {rand(10000.0).to_f}
+  string_array1000 = array_length.times.to_a.map {"r" * rand(1..10000)}
+  mix_array1000 = array_length.times.to_a.map {if rand(1..100) <= 50 then rand(1..10000).to_f else rand(1..10000) end}
+  all_zero_array1000 =array_length.times.to_a.map {0}
+
+  array_length = 100000
+  fixnum_array100000 = array_length.times.to_a.map {rand(10000)}
+  float_array100000 = array_length.times.to_a.map {rand(10000.0).to_f}
+  string_array100000 = array_length.times.to_a.map {"r" * rand(1..10000)}
+  mix_array100000 = array_length.times.to_a.map {if rand(1..100) <= 50 then rand(1..10000).to_f else rand(1..10000) end}
+  all_zero_array100000 =array_length.times.to_a.map {0}
+
+benchmark:
+  fixnum_array2.sort_by: fixnum_array2.sort_by {|a| a}
+  float_array2.sort_by:  float_array2.sort_by {|a| a}
+  string_length2.sort_by: string_array2.sort_by {|a| a.length}
+  mix_array2.sort_by:  mix_array2.sort_by {|a| a}
+  all_zero2.sort_by: all_zero_array2.sort_by{|a| a}
+
+  fixnum_array10.sort_by: fixnum_array10.sort_by {|a| a}
+  float_array10.sort_by:  float_array10.sort_by {|a| a}
+  string_length10.sort_by: string_array10.sort_by {|a| a.length}
+  mix_array10.sort_by:  mix_array10.sort_by {|a| a}
+  all_zero10.sort_by: all_zero_array10.sort_by{|a| a}
+
+  fixnum_array1000.sort_by: fixnum_array1000.sort_by {|a| a}
+  float_array1000.sort_by:  float_array1000.sort_by {|a| a}
+  string_length1000.sort_by: string_array1000.sort_by {|a| a.length}
+  mix_array1000.sort_by:  mix_array1000.sort_by {|a| a}
+  all_zero1000.sort_by: all_zero_array1000.sort_by{|a| a}
+
+  fixnum_array100000.sort_by: fixnum_array100000.sort_by {|a| a}
+  float_array100000.sort_by:  float_array100000.sort_by {|a| a}
+  string_length100000.sort_by: string_array100000.sort_by {|a| a.length}
+  mix_array100000.sort_by:  mix_array100000.sort_by {|a| a}
+  all_zero100000.sort_by: all_zero_array100000.sort_by{|a| a}
diff --git a/benchmark/erb_escape_html.yml b/benchmark/erb_escape_html.yml
new file mode 100644
index 0000000000..ca28d756e7
--- /dev/null
+++ b/benchmark/erb_escape_html.yml
@@ -0,0 +1,31 @@
+prelude: |
+  # frozen_string_literal: true
+  require 'erb'
+benchmark:
+  - script: ERB::Util.html_escape("")
+    loop_count: 20000000
+  - script: ERB::Util.html_escape("abcde")
+    loop_count: 20000000
+  - script: ERB::Util.html_escape("abcd<")
+    loop_count: 20000000
+  - script: ERB::Util.html_escape("'&\"<>")
+    loop_count: 5000000
+  - prelude: long_no_escape = "abcde" * 300
+    script: ERB::Util.html_escape(long_no_escape)
+    loop_count: 1000000
+  - prelude: long_all_escape = "'&\"<>" * 10
+    script: ERB::Util.html_escape(long_all_escape)
+    loop_count: 1000000
+  - prelude: | # http://example.com/
+      example_html = <<~HTML
+        <body>
+        <div>
+            <h1>Example Domain</h1>
+            <p>This domain is established to be used for illustrative examples in documents. You may use this
+            domain in examples without prior coordination or asking for permission.</p>
+            <p><a href="http://www.iana.org/domains/example">More information...</a></p>
+        </div>
+        </body>
+      HTML
+    script: ERB::Util.html_escape(example_html)
+    loop_count: 1000000
diff --git a/benchmark/file_dirname.yml b/benchmark/file_dirname.yml
new file mode 100644
index 0000000000..43a81c9371
--- /dev/null
+++ b/benchmark/file_dirname.yml
@@ -0,0 +1,6 @@
+prelude: |
+  # frozen_string_literal: true
+benchmark:
+  long: File.dirname("/Users/george/src/github.com/ruby/ruby/benchmark/file_dirname.yml")
+  short: File.dirname("foo/bar")
+  n_4: File.dirname("/Users/george/src/github.com/ruby/ruby/benchmark/file_dirname.yml", 4)
diff --git a/benchmark/file_extname.yml b/benchmark/file_extname.yml
new file mode 100644
index 0000000000..fb16e55840
--- /dev/null
+++ b/benchmark/file_extname.yml
@@ -0,0 +1,6 @@
+prelude: |
+  # frozen_string_literal: true
+benchmark:
+  long: File.extname("/Users/george/src/github.com/ruby/ruby/benchmark/file_dirname.yml")
+  long_name: File.extname("Users_george_src_github.com_ruby_ruby_benchmark_file_dirname.yml")
+  short: File.extname("foo/bar")
diff --git a/benchmark/file_join.yml b/benchmark/file_join.yml
new file mode 100644
index 0000000000..845257cf1e
--- /dev/null
+++ b/benchmark/file_join.yml
@@ -0,0 +1,7 @@
+prelude: |
+  # frozen_string_literal: true
+benchmark:
+  two_strings: File.join(__FILE__, "path")
+  many_strings: File.join(__FILE__, "path", "a", "b", "c", "d")
+  array: File.join([__FILE__, "path", "a", "b", "c", "d"])
+  mixed: File.join(__FILE__, "path", "a", "b", ["c", "d"])
diff --git a/benchmark/hash_aref_str_lit.yml b/benchmark/hash_aref_str_lit.yml
new file mode 100644
index 0000000000..ed8142bcf1
--- /dev/null
+++ b/benchmark/hash_aref_str_lit.yml
@@ -0,0 +1,20 @@
+prelude: |
+  # frozen_string_literal: true
+  hash = 10.times.to_h do |i|
+    [i, i]
+  end
+  dyn_sym = "dynamic_symbol".to_sym
+  binary = RubyVM::InstructionSequence.compile("# frozen_string_literal: true\n'iseq_load'").to_binary
+  iseq_literal_string = RubyVM::InstructionSequence.load_from_binary(binary).eval
+
+  hash[:some_symbol] = 1
+  hash[dyn_sym] = 2
+  hash["small"] = 3
+  hash["frozen_string_literal"] = 4
+  hash[iseq_literal_string] = 5
+benchmark:
+  symbol: hash[:some_symbol]
+  dyn_symbol: hash[dyn_sym]
+  small_lit: hash["small"]
+  frozen_lit: hash["frozen_string_literal"]
+  iseq_lit: hash[iseq_literal_string]
diff --git a/benchmark/hash_key.yml b/benchmark/hash_key.yml
new file mode 100644
index 0000000000..cab4cf9ca4
--- /dev/null
+++ b/benchmark/hash_key.yml
@@ -0,0 +1,5 @@
+prelude: |
+  obj = Object.new
+  hash = { obj => true }
+benchmark: hash.key?(obj)
+loop_count: 30000000
diff --git a/benchmark/hash_new.yml b/benchmark/hash_new.yml
new file mode 100644
index 0000000000..9d8e34187f
--- /dev/null
+++ b/benchmark/hash_new.yml
@@ -0,0 +1,16 @@
+prelude: |
+  has_hash_with_capa = Hash.instance_method(:initialize).parameters.include?([:key, :capacity])
+  strings_1k = 1_000.times.map { |i| -i.to_s.freeze }
+  strings_100k = 100_000.times.map { |i| -i.to_s.freeze }
+benchmark:
+  new: Hash.new
+  new_with_capa_1k: |
+    h = has_hash_with_capa ? Hash.new(capacity: strings_1k.size) : {}
+    strings_1k.each do |x|
+      h[x] = true
+    end
+  new_with_capa_100k: |
+    h = has_hash_with_capa ? Hash.new(capacity: strings_100k.size) : {}
+    strings_100k.each do |x|
+      h[x] = true
+    end
diff --git a/benchmark/io_close.yml b/benchmark/io_close.yml
new file mode 100644
index 0000000000..a552872884
--- /dev/null
+++ b/benchmark/io_close.yml
@@ -0,0 +1,13 @@
+prelude: |
+  ios = 1000.times.map do
+    100.times.map{IO.pipe}
+  end
+benchmark:
+  # Close IO
+  io_close: |
+    # Process each batch of ios per iteration of the benchmark.
+    ios.pop.each do |r, w|
+      r.close
+      w.close
+    end
+loop_count: 100
diff --git a/benchmark/io_close_contended.yml b/benchmark/io_close_contended.yml
new file mode 100644
index 0000000000..1d9e4e0d0f
--- /dev/null
+++ b/benchmark/io_close_contended.yml
@@ -0,0 +1,21 @@
+prelude: |
+  ios = 100.times.map do
+    10.times.map do
+      pipe = IO.pipe.tap do |r, w|
+        Thread.new do
+          r.read
+        rescue IOError
+          # Ignore
+        end
+      end
+    end
+  end
+benchmark:
+  # Close IO
+  io_close_contended: |
+    # Process each batch of ios per iteration of the benchmark.
+    ios.pop.each do |r, w|
+      r.close
+      w.close
+    end
+loop_count: 10
diff --git a/benchmark/io_write.rb b/benchmark/io_write.rb
new file mode 100644
index 0000000000..cdb409948b
--- /dev/null
+++ b/benchmark/io_write.rb
@@ -0,0 +1,22 @@
+#!/usr/bin/env ruby
+
+require 'benchmark'
+
+i, o = IO.pipe
+o.sync = true
+
+DOT = ".".freeze
+
+chunks = 100_000.times.collect{DOT}
+
+thread = Thread.new do
+  while i.read(1024)
+  end
+end
+
+100.times do
+  o.write(*chunks)
+end
+
+o.close
+thread.join
diff --git a/benchmark/lib/benchmark_driver/runner/mjit.rb b/benchmark/lib/benchmark_driver/runner/mjit.rb
deleted file mode 100644
index 1d4693e8be..0000000000
--- a/benchmark/lib/benchmark_driver/runner/mjit.rb
+++ /dev/null
@@ -1,34 +0,0 @@
-require 'benchmark_driver/struct'
-require 'benchmark_driver/metric'
-require 'erb'
-
-# A runner to measure after-JIT performance easily
-class BenchmarkDriver::Runner::Mjit < BenchmarkDriver::Runner::Ips
-  # JobParser returns this, `BenchmarkDriver::Runner.runner_for` searches "*::Job"
-  Job = Class.new(BenchmarkDriver::DefaultJob)
-
-  # Dynamically fetched and used by `BenchmarkDriver::JobParser.parse`
-  JobParser = BenchmarkDriver::DefaultJobParser.for(klass: Job, metrics: [METRIC]).extend(Module.new{
-    def parse(**)
-      jobs = super
-      jobs.map do |job|
-        job = job.dup
-        job.prelude = "#{job.prelude}\n#{<<~EOS}"
-          if defined?(RubyVM::MJIT) && RubyVM::MJIT.enabled?
-            __bmdv_ruby_i = 0
-            while __bmdv_ruby_i < 10000 # jit_min_calls
-              #{job.script}
-              __bmdv_ruby_i += 1
-            end
-            RubyVM::MJIT.pause # compile
-            #{job.script}
-            RubyVM::MJIT.resume; RubyVM::MJIT.pause # recompile
-            #{job.script}
-            RubyVM::MJIT.resume; RubyVM::MJIT.pause # recompile 2
-          end
-        EOS
-        job
-      end
-    end
-  })
-end
diff --git a/benchmark/lib/benchmark_driver/runner/mjit_exec.rb b/benchmark/lib/benchmark_driver/runner/mjit_exec.rb
deleted file mode 100644
index eac3dfba84..0000000000
--- a/benchmark/lib/benchmark_driver/runner/mjit_exec.rb
+++ /dev/null
@@ -1,237 +0,0 @@
-require 'benchmark_driver/struct'
-require 'benchmark_driver/metric'
-require 'erb'
-
-# A special runner dedicated for measuring mjit_exec overhead.
-class BenchmarkDriver::Runner::MjitExec
-  METRIC = BenchmarkDriver::Metric.new(name: 'Iteration per second', unit: 'i/s')
-
-  # JobParser returns this, `BenchmarkDriver::Runner.runner_for` searches "*::Job"
-  Job = ::BenchmarkDriver::Struct.new(
-    :name,        # @param [String] name - This is mandatory for all runner
-    :metrics,     # @param [Array<BenchmarkDriver::Metric>]
-    :num_methods, # @param [Integer] num_methods - The number of methods to be defined
-    :loop_count,  # @param [Integer] loop_count
-    :from_jit,    # @param [TrueClass,FalseClass] from_jit - Whether the mjit_exec() is from JIT or not
-    :to_jit,      # @param [TrueClass,FalseClass] to_jit - Whether the mjit_exec() is to JIT or not
-  )
-  # Dynamically fetched and used by `BenchmarkDriver::JobParser.parse`
-  class << JobParser = Module.new
-    # @param [Array,String] num_methods
-    # @param [Integer] loop_count
-    # @param [TrueClass,FalseClass] from_jit
-    # @param [TrueClass,FalseClass] to_jit
-    def parse(num_methods:, loop_count:, from_jit:, to_jit:)
-      if num_methods.is_a?(String)
-        num_methods = eval(num_methods)
-      end
-
-      num_methods.map do |num|
-        if num_methods.size > 1
-          suffix = "[#{'%4d' % num}]"
-        else
-          suffix = "_#{num}"
-        end
-        Job.new(
-          name: "mjit_exec_#{from_jit ? 'JT' : 'VM'}2#{to_jit ? 'JT' : 'VM'}#{suffix}",
-          metrics: [METRIC],
-          num_methods: num,
-          loop_count: loop_count,
-          from_jit: from_jit,
-          to_jit: to_jit,
-        )
-      end
-    end
-  end
-
-  # @param [BenchmarkDriver::Config::RunnerConfig] config
-  # @param [BenchmarkDriver::Output] output
-  # @param [BenchmarkDriver::Context] contexts
-  def initialize(config:, output:, contexts:)
-    @config = config
-    @output = output
-    @contexts = contexts
-  end
-
-  # This method is dynamically called by `BenchmarkDriver::JobRunner.run`
-  # @param [Array<BenchmarkDriver::Runner::Peak::Job>] jobs
-  def run(jobs)
-    @output.with_benchmark do
-      jobs.each do |job|
-        @output.with_job(name: job.name) do
-          @contexts.each do |context|
-            result = BenchmarkDriver::Repeater.with_repeat(config: @config, larger_better: true, rest_on_average: :average) do
-              run_benchmark(job, context: context)
-            end
-            value, duration = result.value
-            @output.with_context(name: context.name, executable: context.executable, gems: context.gems, prelude: context.prelude) do
-              @output.report(values: { METRIC => value }, duration: duration, loop_count: job.loop_count)
-            end
-          end
-        end
-      end
-    end
-  end
-
-  private
-
-  # @param [BenchmarkDriver::Runner::Ips::Job] job - loop_count is not nil
-  # @param [BenchmarkDriver::Context] context
-  # @return [BenchmarkDriver::Metrics]
-  def run_benchmark(job, context:)
-    if job.from_jit
-      if job.to_jit
-        benchmark = BenchmarkJT2JT.new(num_methods: job.num_methods, loop_count: job.loop_count)
-      else
-        raise NotImplementedError, "JT2VM is not implemented yet"
-      end
-    else
-      if job.to_jit
-        benchmark = BenchmarkVM2JT.new(num_methods: job.num_methods, loop_count: job.loop_count)
-      else
-        benchmark = BenchmarkVM2VM.new(num_methods: job.num_methods, loop_count: job.loop_count)
-      end
-    end
-
-    duration = Tempfile.open(['benchmark_driver-result', '.txt']) do |f|
-      with_script(benchmark.render(result: f.path)) do |path|
-        opt = []
-        if context.executable.command.any? { |c| c.start_with?('--jit') }
-          opt << '--jit-min-calls=2'
-        end
-        IO.popen([*context.executable.command, '--disable-gems', *opt, path], &:read)
-        if $?.success?
-          Float(f.read)
-        else
-          BenchmarkDriver::Result::ERROR
-        end
-      end
-    end
-
-    [job.loop_count.to_f / duration, duration]
-  end
-
-  def with_script(script)
-    if @config.verbose >= 2
-      sep = '-' * 30
-      $stdout.puts "\n\n#{sep}[Script begin]#{sep}\n#{script}#{sep}[Script end]#{sep}\n\n"
-    end
-
-    Tempfile.open(['benchmark_driver-', '.rb']) do |f|
-      f.puts script
-      f.close
-      return yield(f.path)
-    end
-  end
-
-  # @param [Integer] num_methods
-  # @param [Integer] loop_count
-  BenchmarkVM2VM = ::BenchmarkDriver::Struct.new(:num_methods, :loop_count) do
-    # @param [String] result - A file to write result
-    def render(result:)
-      ERB.new(<<~EOS, trim_mode: '%').result(binding)
-        % num_methods.times do |i|
-        def a<%= i %>
-          nil
-        end
-        % end
-        RubyVM::MJIT.pause if defined?(RubyVM::MJIT) && RubyVM::MJIT.enabled?
-
-        def vm
-          t = Process.clock_gettime(Process::CLOCK_MONOTONIC)
-          i = 0
-          while i < <%= loop_count / 1000 %>
-        % 1000.times do |i|
-            a<%= i % num_methods %>
-        % end
-            i += 1
-          end
-        % (loop_count % 1000).times do |i|
-          a<%= i % num_methods %>
-        % end
-          Process.clock_gettime(Process::CLOCK_MONOTONIC) - t
-        end
-
-        vm # warmup call cache
-        File.write(<%= result.dump %>, vm)
-      EOS
-    end
-  end
-  private_constant :BenchmarkVM2VM
-
-  # @param [Integer] num_methods
-  # @param [Integer] loop_count
-  BenchmarkVM2JT = ::BenchmarkDriver::Struct.new(:num_methods, :loop_count) do
-    # @param [String] result - A file to write result
-    def render(result:)
-      ERB.new(<<~EOS, trim_mode: '%').result(binding)
-        % num_methods.times do |i|
-        def a<%= i %>
-          nil
-        end
-        a<%= i %>
-        a<%= i %> # --jit-min-calls=2
-        % end
-        RubyVM::MJIT.pause if defined?(RubyVM::MJIT) && RubyVM::MJIT.enabled?
-
-        def vm
-          t = Process.clock_gettime(Process::CLOCK_MONOTONIC)
-          i = 0
-          while i < <%= loop_count / 1000 %>
-        % 1000.times do |i|
-            a<%= i % num_methods %>
-        % end
-            i += 1
-          end
-        % (loop_count % 1000).times do |i|
-          a<%= i % num_methods %>
-        % end
-          Process.clock_gettime(Process::CLOCK_MONOTONIC) - t
-        end
-
-        vm # warmup call cache
-        File.write(<%= result.dump %>, vm)
-      EOS
-    end
-  end
-  private_constant :BenchmarkVM2JT
-
-  # @param [Integer] num_methods
-  # @param [Integer] loop_count
-  BenchmarkJT2JT = ::BenchmarkDriver::Struct.new(:num_methods, :loop_count) do
-    # @param [String] result - A file to write result
-    def render(result:)
-      ERB.new(<<~EOS, trim_mode: '%').result(binding)
-        % num_methods.times do |i|
-        def a<%= i %>
-          nil
-        end
-        % end
-
-        # You may need to:
-        #   * Increase `JIT_ISEQ_SIZE_THRESHOLD` to 10000000 in mjit.h
-        #   * Always return false in `inlinable_iseq_p()` of mjit_compile.c
-        def jit
-          t = Process.clock_gettime(Process::CLOCK_MONOTONIC)
-          i = 0
-          while i < <%= loop_count / 1000 %>
-        % 1000.times do |i|
-            a<%= i % num_methods %>
-        % end
-            i += 1
-          end
-        % (loop_count % 1000).times do |i|
-          a<%= i % num_methods %>
-        % end
-          Process.clock_gettime(Process::CLOCK_MONOTONIC) - t
-        end
-
-        jit
-        jit
-        RubyVM::MJIT.pause if defined?(RubyVM::MJIT) && RubyVM::MJIT.enabled?
-        File.write(<%= result.dump %>, jit)
-      EOS
-    end
-  end
-  private_constant :BenchmarkJT2JT
-end
diff --git a/benchmark/lib/benchmark_driver/runner/ractor.rb b/benchmark/lib/benchmark_driver/runner/ractor.rb
index c730b8e4a5..fd9c2dd4db 100644
--- a/benchmark/lib/benchmark_driver/runner/ractor.rb
+++ b/benchmark/lib/benchmark_driver/runner/ractor.rb
@@ -87,7 +87,7 @@ __bmdv_ractors << Ractor.new(__bmdv_loop_after - __bmdv_loop_before) { |__bmdv_l
 <% end %>
 
 # Wait for all Ractors before executing code to write results
-__bmdv_ractors.map!(&:take)
+__bmdv_ractors.map!(&:value)
 
 <% results.each do |result| %>
 File.write(<%= result.dump %>, __bmdv_ractors.shift)
diff --git a/benchmark/loop_each.yml b/benchmark/loop_each.yml
new file mode 100644
index 0000000000..1c757185a8
--- /dev/null
+++ b/benchmark/loop_each.yml
@@ -0,0 +1,4 @@
+prelude: |
+  arr = [nil] * 30_000_000
+benchmark:
+  loop_each: arr.each{|e|}
diff --git a/benchmark/loop_generator.rb b/benchmark/loop_generator.rb
index d3375c744c..6a3194b670 100644
--- a/benchmark/loop_generator.rb
+++ b/benchmark/loop_generator.rb
@@ -1,4 +1,4 @@
-max = 600000
+max = 6000000
 
 if defined? Fiber
   gen = (1..max).each
diff --git a/benchmark/loop_times_megamorphic.yml b/benchmark/loop_times_megamorphic.yml
new file mode 100644
index 0000000000..f9343ba897
--- /dev/null
+++ b/benchmark/loop_times_megamorphic.yml
@@ -0,0 +1,7 @@
+prelude: |
+  eval(<<~EOS)
+    def loop_times_megamorphic
+      #{"1.times {|i|};" * 1000}
+    end
+  EOS
+benchmark: loop_times_megamorphic
diff --git a/benchmark/marshal_dump_load_integer.yml b/benchmark/marshal_dump_load_integer.yml
new file mode 100644
index 0000000000..78ebf823d2
--- /dev/null
+++ b/benchmark/marshal_dump_load_integer.yml
@@ -0,0 +1,22 @@
+prelude: |
+  smallint_array = 1000.times.map { |x| x }
+  bigint32_array = 1000.times.map { |x| x + 2**32 }
+  bigint64_array = 1000.times.map { |x| x + 2**64 }
+
+  smallint_dump = Marshal.dump(smallint_array)
+  bigint32_dump = Marshal.dump(bigint32_array)
+  bigint64_dump = Marshal.dump(bigint64_array)
+benchmark:
+  marshal_dump_integer_small: |
+    Marshal.dump(smallint_array)
+  marshal_dump_integer_over_32_bit: |
+    Marshal.dump(bigint32_array)
+  marshal_dump_integer_over_64_bit: |
+    Marshal.dump(bigint64_array)
+  marshal_load_integer_small: |
+    Marshal.load(smallint_dump)
+  marshal_load_integer_over_32_bit: |
+    Marshal.load(bigint32_dump)
+  marshal_load_integer_over_64_bit: |
+    Marshal.load(bigint64_dump)
+loop_count: 4000
diff --git a/benchmark/masgn.yml b/benchmark/masgn.yml
index 4be9333e23..31cb8ee4a3 100644
--- a/benchmark/masgn.yml
+++ b/benchmark/masgn.yml
@@ -1,7 +1,7 @@
 prelude: |
   a = [nil] * 3
   b = Class.new{attr_writer :a, :b, :c}.new
-  c, d, e, f = nil, nil, nil, nil
+  c = d = e = f = g = h = i = nil
 benchmark:
   array2_2: "c = (a[0], a[1] = 1, 2)"
   array2_3: "c = (a[0], a[1] = 1, 2, 3)"
@@ -27,3 +27,27 @@ benchmark:
   lvar2_3p: "(d, e = 1, 2, 3; nil)"
   lvar3_2p: "(d, e, f = 1, 2; nil)"
   lvar3_3p: "(d, e, f = 1, 2, 3; nil)"
+  array2_2lv: "c = (a[0], a[1] = g, h)"
+  array2_ilv: "c = (a[0], a[1] = g, h, i)"
+  arrayi_2lv: "c = (a[0], a[1], a[2] = g, h)"
+  arrayi_ilv: "c = (a[0], a[1], a[2] = g, h, i)"
+  attr2_2lv: "c = (b.a, b.b = g, h)"
+  attr2_ilv: "c = (b.a, b.b = g, h, i)"
+  attri_2lv: "c = (b.a, b.b, b.c = g, h)"
+  attri_ilv: "c = (b.a, b.b, b.c = g, h, i)"
+  lvar2_2lv: "c = (d, e = g, h)"
+  lvar2_ilv: "c = (d, e = g, h, i)"
+  lvari_2lv: "c = (d, e, f = g, h)"
+  lvari_ilv: "c = (d, e, f = g, h, i)"
+  array2_2plv: "(a[0], a[1] = g, h; nil)"
+  array2_iplv: "(a[0], a[1] = g, h, i; nil)"
+  arrayi_2plv: "(a[0], a[1], a[2] = g, h; nil)"
+  arrayi_iplv: "(a[0], a[1], a[2] = g, h, i; nil)"
+  attr2_2plv: "(b.a, b.b = g, h; nil)"
+  attr2_iplv: "(b.a, b.b = g, h, i; nil)"
+  attri_2plv: "(b.a, b.b, b.c = g, h; nil)"
+  attri_iplv: "(b.a, b.b, b.c = g, h, i; nil)"
+  lvar2_2plv: "(d, e = g, h; nil)"
+  lvar2_iplv: "(d, e = g, h, i; nil)"
+  lvari_2plv: "(d, e, f = g, h; nil)"
+  lvari_iplv: "(d, e, f = g, h, i; nil)"
diff --git a/benchmark/mjit_exec_jt2jt.yml b/benchmark/mjit_exec_jt2jt.yml
deleted file mode 100644
index 6c303c7a44..0000000000
--- a/benchmark/mjit_exec_jt2jt.yml
+++ /dev/null
@@ -1,6 +0,0 @@
-type: lib/benchmark_driver/runner/mjit_exec
-num_methods: [1]
-#num_methods: (1..100).to_a + [200, 300, 400, 500, 600, 700, 800, 900, 1000]
-loop_count: 50000000
-from_jit: true
-to_jit: true
diff --git a/benchmark/mjit_exec_vm2jt.yml b/benchmark/mjit_exec_vm2jt.yml
deleted file mode 100644
index 764883f070..0000000000
--- a/benchmark/mjit_exec_vm2jt.yml
+++ /dev/null
@@ -1,6 +0,0 @@
-type: lib/benchmark_driver/runner/mjit_exec
-num_methods: [1]
-#num_methods: (1..100).to_a + [200, 300, 400, 500, 600, 700, 800, 900, 1000]
-loop_count: 50000000
-from_jit: false
-to_jit: true
diff --git a/benchmark/mjit_exec_vm2vm.yml b/benchmark/mjit_exec_vm2vm.yml
deleted file mode 100644
index 030aa76c1c..0000000000
--- a/benchmark/mjit_exec_vm2vm.yml
+++ /dev/null
@@ -1,6 +0,0 @@
-type: lib/benchmark_driver/runner/mjit_exec
-num_methods: [1]
-#num_methods: (1..100).to_a + [200, 300, 400, 500, 600, 700, 800, 900, 1000]
-loop_count: 50000000
-from_jit: false
-to_jit: false
diff --git a/benchmark/mjit_exivar.yml b/benchmark/mjit_exivar.yml
deleted file mode 100644
index 2584fa6410..0000000000
--- a/benchmark/mjit_exivar.yml
+++ /dev/null
@@ -1,18 +0,0 @@
-type: lib/benchmark_driver/runner/mjit
-prelude: |
-  class Bench < Hash
-    def initialize
-      @exivar = nil
-    end
-
-    def exivar
-      @exivar
-    end
-  end
-
-  bench = Bench.new
-
-benchmark:
-  mjit_exivar: bench.exivar
-
-loop_count: 200000000
diff --git a/benchmark/mjit_integer.yml b/benchmark/mjit_integer.yml
deleted file mode 100644
index a6b5c9ee16..0000000000
--- a/benchmark/mjit_integer.yml
+++ /dev/null
@@ -1,32 +0,0 @@
-type: lib/benchmark_driver/runner/mjit
-prelude: |
-  def mjit_abs(int)        int.abs        end
-  def mjit_bit_length(int) int.bit_length end
-  def mjit_comp(int)       ~int           end
-  def mjit_even?(int)      int.even?      end
-  def mjit_integer?(int)   int.integer?   end
-  def mjit_magnitude(int)  int.magnitude  end
-  def mjit_odd?(int)       int.odd?       end
-  def mjit_ord(int)        int.ord        end
-  def mjit_size(int)       int.size       end
-  def mjit_to_i(int)       int.to_i       end
-  def mjit_to_int(int)     int.to_int     end
-  def mjit_uminus(int)     -int           end
-  def mjit_zero?(int)      int.zero?      end
-
-benchmark:
-  - mjit_abs(-1)
-  - mjit_bit_length(100)
-  - mjit_comp(1)
-  - mjit_even?(2)
-  - mjit_integer?(0)
-  - mjit_magnitude(-1)
-  - mjit_odd?(1)
-  - mjit_ord(1)
-  - mjit_size(1)
-  - mjit_to_i(1)
-  - mjit_to_int(1)
-  - mjit_uminus(1)
-  - mjit_zero?(0)
-
-loop_count: 40000000
diff --git a/benchmark/mjit_kernel.yml b/benchmark/mjit_kernel.yml
deleted file mode 100644
index 7720e65c2c..0000000000
--- a/benchmark/mjit_kernel.yml
+++ /dev/null
@@ -1,20 +0,0 @@
-type: lib/benchmark_driver/runner/mjit
-prelude: |
-  def mjit_class(obj)
-    obj.class
-  end
-
-  def mjit_frozen?(obj)
-    obj.frozen?
-  end
-
-  str = ""
-  fstr = "".freeze
-
-benchmark:
-  - mjit_class(self)
-  - mjit_class(1)
-  - mjit_frozen?(str)
-  - mjit_frozen?(fstr)
-
-loop_count: 40000000
diff --git a/benchmark/mjit_leave.yml b/benchmark/mjit_leave.yml
deleted file mode 100644
index 9ac68b164b..0000000000
--- a/benchmark/mjit_leave.yml
+++ /dev/null
@@ -1,8 +0,0 @@
-type: lib/benchmark_driver/runner/mjit
-prelude: |
-  def leave
-    nil
-  end
-benchmark:
-  mjit_leave: leave
-loop_count: 200000000
diff --git a/benchmark/mjit_opt_cc_insns.yml b/benchmark/mjit_opt_cc_insns.yml
deleted file mode 100644
index fed6d34bd5..0000000000
--- a/benchmark/mjit_opt_cc_insns.yml
+++ /dev/null
@@ -1,27 +0,0 @@
-# opt_* insns using vm_method_cfunc_is with send-compatible operands:
-#   * opt_nil_p
-#   * opt_not
-#   * opt_eq
-type: lib/benchmark_driver/runner/mjit
-prelude: |
-  def mjit_nil?(obj)
-    obj.nil?
-  end
-
-  def mjit_not(obj)
-    !obj
-  end
-
-  def mjit_eq(a, b)
-    a == b
-  end
-
-benchmark:
-  - script: mjit_nil?(1)
-    loop_count: 40000000
-  - script: mjit_not(1)
-    loop_count: 40000000
-  - script: mjit_eq(1, nil)
-    loop_count: 8000000
-  - script: mjit_eq(nil, 1)
-    loop_count: 8000000
diff --git a/benchmark/mjit_struct_aref.yml b/benchmark/mjit_struct_aref.yml
deleted file mode 100644
index bfba1323f2..0000000000
--- a/benchmark/mjit_struct_aref.yml
+++ /dev/null
@@ -1,10 +0,0 @@
-type: lib/benchmark_driver/runner/mjit
-prelude: |
-  def mjit_struct_aref(struct)
-    struct.aa
-  end
-  struct = Struct.new(:a0, :a1, :a2, :a3, :a4, :a5, :a6, :a7, :a8, :a9, :aa).new
-
-benchmark: mjit_struct_aref(struct)
-
-loop_count: 40000000
diff --git a/benchmark/module_eqq.yml b/benchmark/module_eqq.yml
index a561fb86dc..2f9c490d92 100644
--- a/benchmark/module_eqq.yml
+++ b/benchmark/module_eqq.yml
@@ -1,4 +1,5 @@
 prelude: |
+  module SomeModule; end
   class SimpleClass; end
   class MediumClass
     10.times { include Module.new }
@@ -24,4 +25,8 @@ benchmark:
     SimpleClass === LargeObj
   simple_class_eqq_huge_obj: |
     SimpleClass === HugeObj
-loop_count: 20000000
+  simple_class_eqq_module: |
+    SimpleClass === HugeObj
+  module_eqq_module: |
+    SomeModule === HugeObj
+loop_count: 10000000
diff --git a/benchmark/nilclass.yml b/benchmark/nilclass.yml
index fba67a5f6a..66234c4cdf 100644
--- a/benchmark/nilclass.yml
+++ b/benchmark/nilclass.yml
@@ -1,6 +1,16 @@
+prelude: |
+  def a = nil
 benchmark:
+  rationalize:
+    nil.rationalize
+  to_c: |
+    nil.to_c
   to_i: |
     nil.to_i
   to_f: |
     nil.to_f
+  to_r: |
+    nil.to_r
+  splat: |
+    a(*nil)
 loop_count: 100000
diff --git a/benchmark/numeric_methods.yml b/benchmark/numeric_methods.yml
index 433c2268a3..1384902935 100644
--- a/benchmark/numeric_methods.yml
+++ b/benchmark/numeric_methods.yml
@@ -10,4 +10,20 @@ benchmark:
     int.finite?
   infinite?: |
     int.infinite?
+  integer_real: |
+    int.real
+  float_real: |
+    flo.real
+  integr_imag: |
+    int.imag
+  float_imag: |
+    flo.imag
+  integer_conj: |
+    int.conj
+  float_conj: |
+    flo.conj
+  integer_numerator: |
+    int.numerator
+  integer_denominator: |
+    int.denominator
 loop_count: 20000000
diff --git a/benchmark/object_allocate.yml b/benchmark/object_allocate.yml
index 93ff463e41..c6269923f0 100644
--- a/benchmark/object_allocate.yml
+++ b/benchmark/object_allocate.yml
@@ -11,6 +11,26 @@ prelude: |
   class OneTwentyEight
     128.times { include(Module.new) }
   end
+  class OnePositional
+    def initialize a; end
+  end
+  class TwoPositional
+    def initialize a, b; end
+  end
+  class ThreePositional
+    def initialize a, b, c; end
+  end
+  class FourPositional
+    def initialize a, b, c, d; end
+  end
+  class KWArg
+    def initialize a:, b:, c:, d:
+    end
+  end
+  class Mixed
+    def initialize a, b, c:, d:
+    end
+  end
   # Disable GC to see raw throughput:
   GC.disable
 benchmark:
@@ -18,4 +38,12 @@ benchmark:
   allocate_32_deep: ThirtyTwo.new
   allocate_64_deep: SixtyFour.new
   allocate_128_deep: OneTwentyEight.new
+  allocate_1_positional_params: OnePositional.new(1)
+  allocate_2_positional_params: TwoPositional.new(1, 2)
+  allocate_3_positional_params: ThreePositional.new(1, 2, 3)
+  allocate_4_positional_params: FourPositional.new(1, 2, 3, 4)
+  allocate_kwarg_params: "KWArg.new(a: 1, b: 2, c: 3, d: 4)"
+  allocate_mixed_params: "Mixed.new(1, 2, c: 3, d: 4)"
+  allocate_no_params: "Object.new"
+  allocate_allocate: "Object.allocate"
 loop_count: 100000
diff --git a/benchmark/object_class.yml b/benchmark/object_class.yml
new file mode 100644
index 0000000000..1e5409d1e2
--- /dev/null
+++ b/benchmark/object_class.yml
@@ -0,0 +1,40 @@
+prelude: |
+  def get_class(obj)
+    i = 10_000
+    while i > 0
+      i -= 1
+      # 100 times per loop
+      obj.class; obj.class; obj.class; obj.class; obj.class; obj.class; obj.class; obj.class; obj.class; obj.class;
+      obj.class; obj.class; obj.class; obj.class; obj.class; obj.class; obj.class; obj.class; obj.class; obj.class;
+      obj.class; obj.class; obj.class; obj.class; obj.class; obj.class; obj.class; obj.class; obj.class; obj.class;
+      obj.class; obj.class; obj.class; obj.class; obj.class; obj.class; obj.class; obj.class; obj.class; obj.class;
+      obj.class; obj.class; obj.class; obj.class; obj.class; obj.class; obj.class; obj.class; obj.class; obj.class;
+      obj.class; obj.class; obj.class; obj.class; obj.class; obj.class; obj.class; obj.class; obj.class; obj.class;
+      obj.class; obj.class; obj.class; obj.class; obj.class; obj.class; obj.class; obj.class; obj.class; obj.class;
+      obj.class; obj.class; obj.class; obj.class; obj.class; obj.class; obj.class; obj.class; obj.class; obj.class;
+      obj.class; obj.class; obj.class; obj.class; obj.class; obj.class; obj.class; obj.class; obj.class; obj.class;
+      obj.class; obj.class; obj.class; obj.class; obj.class; obj.class; obj.class; obj.class; obj.class; obj.class;
+      obj.class; obj.class; obj.class; obj.class; obj.class; obj.class; obj.class; obj.class; obj.class; obj.class;
+    end
+  end
+
+  class Obj
+  end
+  obj = Obj.new
+
+  singleton = Obj.new
+  def singleton.bar
+  end
+
+  extended = Obj.new
+  2.times do
+    extended.extend Module.new
+  end
+
+  immediate = 1.4
+benchmark:
+  obj: get_class(obj)
+  extended: get_class(extended)
+  singleton: get_class(singleton)
+  immediate: get_class(immediate)
+loop_count: 1000
diff --git a/benchmark/object_id.yml b/benchmark/object_id.yml
new file mode 100644
index 0000000000..2bd52b923f
--- /dev/null
+++ b/benchmark/object_id.yml
@@ -0,0 +1,4 @@
+benchmark:
+  baseline: "Object.new"
+  object_id: "Object.new.object_id"
+# loop_count: 100000
diff --git a/benchmark/ractor_string_fstring.yml b/benchmark/ractor_string_fstring.yml
new file mode 100644
index 0000000000..14b92d8fd8
--- /dev/null
+++ b/benchmark/ractor_string_fstring.yml
@@ -0,0 +1,18 @@
+type: lib/benchmark_driver/runner/ractor
+benchmark:
+  ractor_fstring_random: |
+    i = 0
+    str = "same".dup
+    while i < 2000000
+      -(i.to_s.freeze)
+      i += 1
+    end
+  ractor_fstring_same: |
+    i = 0
+    str = "same".dup
+    while i < 2000000
+      -str
+      i += 1
+    end
+loop_count: 1
+ractor: 4
diff --git a/benchmark/range_bsearch_bignum.yml b/benchmark/range_bsearch_bignum.yml
new file mode 100644
index 0000000000..5730c93fcf
--- /dev/null
+++ b/benchmark/range_bsearch_bignum.yml
@@ -0,0 +1,10 @@
+prelude: |
+  first = 2**100
+  last = 2**1000
+  mid = (first + last) / 2
+  r = first..last
+
+benchmark:
+  first: r.bsearch { |x| x >= first }
+  mid: r.bsearch { |x| x >= mid }
+  last: r.bsearch { |x| x >= last }
diff --git a/benchmark/range_bsearch_endpointless.yml b/benchmark/range_bsearch_endpointless.yml
new file mode 100644
index 0000000000..8d7bedb662
--- /dev/null
+++ b/benchmark/range_bsearch_endpointless.yml
@@ -0,0 +1,21 @@
+prelude: |
+  re = (1..)
+  rb = (..0)
+
+benchmark:
+  'endless 10**0': re.bsearch { |x| x >= 1 }
+  'endless 10**1': re.bsearch { |x| x >= 10 }
+  'endless 10**2': re.bsearch { |x| x >= 100 }
+  'endless 10**3': re.bsearch { |x| x >= 1000 }
+  'endless 10**4': re.bsearch { |x| x >= 10000 }
+  'endless 10**5': re.bsearch { |x| x >= 100000 }
+  'endless 10**10': re.bsearch { |x| x >= 10000000000 }
+  'endless 10**100': re.bsearch { |x| x >= 10000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000 }
+  'beginless -10**0': rb.bsearch { |x| x >= -1 }
+  'beginless -10**1': rb.bsearch { |x| x >= -10 }
+  'beginless -10**2': rb.bsearch { |x| x >= -100 }
+  'beginless -10**3': rb.bsearch { |x| x >= -1000 }
+  'beginless -10**4': rb.bsearch { |x| x >= -10000 }
+  'beginless -10**5': rb.bsearch { |x| x >= -100000 }
+  'beginless -10**10': rb.bsearch { |x| x >= -10000000000 }
+  'beginless -10**100': rb.bsearch { |x| x >= -10000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000 }
diff --git a/benchmark/range_bsearch_fixnum.yml b/benchmark/range_bsearch_fixnum.yml
new file mode 100644
index 0000000000..59416531b9
--- /dev/null
+++ b/benchmark/range_bsearch_fixnum.yml
@@ -0,0 +1,10 @@
+prelude: |
+  first = 1
+  last = 10000
+  mid = (first + last) / 2
+  r = first..last
+
+benchmark:
+  first: r.bsearch { |x| x >= first }
+  mid: r.bsearch { |x| x >= mid }
+  last: r.bsearch { |x| x >= last }
diff --git a/benchmark/range_count.yml b/benchmark/range_count.yml
new file mode 100644
index 0000000000..58f53a0236
--- /dev/null
+++ b/benchmark/range_count.yml
@@ -0,0 +1,11 @@
+prelude: |
+  r_1 = 1..1
+  r_1k = 1..1000
+  r_1m = 1..1000000
+  r_str = 'a'..'z'
+
+benchmark:
+  'int 1': r_1.count
+  'int 1K': r_1k.count
+  'int 1M': r_1m.count
+  string: r_str.count
diff --git a/benchmark/range_min.yml b/benchmark/range_min.yml
new file mode 100644
index 0000000000..9e60dd7308
--- /dev/null
+++ b/benchmark/range_min.yml
@@ -0,0 +1,2 @@
+benchmark:
+  - (1..10).min
diff --git a/benchmark/range_overlap.yml b/benchmark/range_overlap.yml
new file mode 100644
index 0000000000..700a00053c
--- /dev/null
+++ b/benchmark/range_overlap.yml
@@ -0,0 +1,19 @@
+prelude: |
+  class Range
+    unless method_defined?(:overlap?)
+      def overlap?(other)
+        other.begin == self.begin || cover?(other.begin) || other.cover?(self.begin)
+      end
+    end
+  end
+
+benchmark:
+  - (2..3).overlap?(1..1)
+  - (2..3).overlap?(2..4)
+  - (2..3).overlap?(4..5)
+  - (2..3).overlap?(2..1)
+  - (2..3).overlap?(0..1)
+  - (2..3).overlap?(...1)
+  - (2...3).overlap?(..2)
+  - (2...3).overlap?(3...)
+  - (2..3).overlap?('a'..'d')
diff --git a/benchmark/range_reverse_each.yml b/benchmark/range_reverse_each.yml
new file mode 100644
index 0000000000..a32efeccc6
--- /dev/null
+++ b/benchmark/range_reverse_each.yml
@@ -0,0 +1,16 @@
+prelude: |
+  rf_1 = 0..1
+  rf_1k = 0..1000
+  rf_1m = 0..1000000
+  big = 2**1000
+  rb_1 = big..big+1
+  rb_1k = big..big+1000
+  rb_1m = big..big+1000000
+
+benchmark:
+  "Fixnum 1": rf_1.reverse_each { _1 }
+  "Fixnum 1K": rf_1k.reverse_each { _1 }
+  "Fixnum 1M": rf_1m.reverse_each { _1 }
+  "Bignum 1": rb_1.reverse_each { _1 }
+  "Bignum 1K": rb_1k.reverse_each { _1 }
+  "Bignum 1M": rb_1m.reverse_each { _1 }
diff --git a/benchmark/realpath.yml b/benchmark/realpath.yml
index 90a029d5b9..6b6a4836b0 100644
--- a/benchmark/realpath.yml
+++ b/benchmark/realpath.yml
@@ -12,6 +12,9 @@ prelude: |
   relative_dir = 'b/c'
   absolute_dir = File.join(pwd, relative_dir)
   file_dir = 'c'
+teardown: |
+  require 'fileutils'
+  FileUtils.rm_rf('b')
 benchmark:
   relative_nil: "f.realpath(relative, nil)"
   absolute_nil: "f.realpath(absolute, nil)"
diff --git a/benchmark/regexp_dup.yml b/benchmark/regexp_dup.yml
new file mode 100644
index 0000000000..52f89991cd
--- /dev/null
+++ b/benchmark/regexp_dup.yml
@@ -0,0 +1,6 @@
+prelude: |
+  str = "a" * 1000
+  re = Regexp.new(str)
+
+benchmark:
+  dup: re.dup
diff --git a/benchmark/regexp_new.yml b/benchmark/regexp_new.yml
new file mode 100644
index 0000000000..bc9ab3ca21
--- /dev/null
+++ b/benchmark/regexp_new.yml
@@ -0,0 +1,7 @@
+prelude: |
+  str = "a" * 1000
+  re = Regexp.new(str)
+
+benchmark:
+  string: Regexp.new(str)
+  regexp: Regexp.new(re)
diff --git a/benchmark/scan.yaml b/benchmark/scan.yaml
new file mode 100644
index 0000000000..62ad1d6862
--- /dev/null
+++ b/benchmark/scan.yaml
@@ -0,0 +1,16 @@
+prelude: |
+  $LOAD_PATH.unshift(File.expand_path("lib"))
+  require "strscan"
+  str = "test string"
+  scanner = StringScanner.new(str)
+  str = "test"
+  reg = /test/
+benchmark:
+  check(reg): |
+    scanner.check(reg)
+  check(str): |
+    scanner.check(str)
+  match?(reg): |
+    scanner.match?(reg)
+  match?(str): |
+    scanner.match?(str)
diff --git a/benchmark/search.yaml b/benchmark/search.yaml
new file mode 100644
index 0000000000..42a50c90e6
--- /dev/null
+++ b/benchmark/search.yaml
@@ -0,0 +1,16 @@
+prelude: |
+  $LOAD_PATH.unshift(File.expand_path("lib"))
+  require "strscan"
+  str = "test string"
+  scanner = StringScanner.new(str)
+  str = "string"
+  reg = /string/
+benchmark:
+  check_until(reg): |
+    scanner.check_until(reg)
+  check_until(str): |
+    scanner.check_until(str)
+  exist?(reg): |
+    scanner.exist?(reg)
+  exist?(str): |
+    scanner.exist?(str)
diff --git a/benchmark/set.yml b/benchmark/set.yml
new file mode 100644
index 0000000000..061509cb1f
--- /dev/null
+++ b/benchmark/set.yml
@@ -0,0 +1,261 @@
+prelude: |
+  # First 1000 digits of pi
+  pi = <<~END.gsub(/\D/, '')
+    31415926535897932384626433832795028841971693993751058209749445923078164062862089
+    98628034825342117067982148086513282306647093844609550582231725359408128481117450
+    28410270193852110555964462294895493038196442881097566593344612847564823378678316
+    52712019091456485669234603486104543266482133936072602491412737245870066063155881
+    74881520920962829254091715364367892590360011330530548820466521384146951941511609
+    43305727036575959195309218611738193261179310511854807446237996274956735188575272
+    48912279381830119491298336733624406566430860213949463952247371907021798609437027
+    70539217176293176752384674818467669405132000568127145263560827785771342757789609
+    17363717872146844090122495343014654958537105079227968925892354201995611212902196
+    08640344181598136297747713099605187072113499999983729780499510597317328160963185
+    95024459455346908302642522308253344685035261931188171010003137838752886587533208
+    38142061717766914730359825349042875546873115956286388235378759375195778185778053
+    21712268066130019278766111959092164201989380952572010654505906988788448549
+  END
+  array1 = 10.times.flat_map do |i|
+    pi[i...].chars.each_slice(10).map(&:join)
+  end
+  array2 = array1.map(&:reverse)
+  array1.map!(&:to_i)
+  array2.map!(&:to_i)
+  a1 = array1[...10]
+  a2 = array1[...100]
+  a3 = array1
+  oa1 = array2[...10]
+  oa2 = array2[...100]
+  oa3 = array2
+  s0 = Set.new
+  s0 = Set.new
+  s1 = Set.new(a1)
+  s2 = Set.new(a2)
+  s3 = Set.new(a3)
+  o0 = Set.new
+  o1 = Set.new(array2[...10])
+  o2 = Set.new(array2[...100])
+  o3 = Set.new(array2)
+  d0 = s0.dup
+  d1 = s1.dup
+  d2 = s2.dup
+  d3 = s3.dup
+  ss1 = s1 - a1[-1..-1]
+  ss2 = s2 - a2[-1..-1]
+  ss3 = s3 - a3[-1..-1]
+  os1 = o1 - oa1[-1..-1]
+  os2 = o2 - oa2[-1..-1]
+  os3 = o3 - oa3[-1..-1]
+  member = a1.first
+  cbi = s0.dup.compare_by_identity
+  ns = Set[s3, o3, d3]
+  set_subclass = Class.new(Set)
+
+benchmark:
+  new_0: Set.new
+  new_10: Set.new(a1)
+  new_100: Set.new(a2)
+  new_1000: Set.new(a3)
+  aref_0: Set[]
+  aref_10: Set[*a1]
+  aref_100: Set[*a2]
+  aref_1000: Set[*a3]
+  amp_0: s0 & o0
+  amp_10: s1 & o1
+  amp_100: s2 & o2
+  amp_1000: s3 & o3
+  amp_same_0: s0 & d0
+  amp_same_10: s1 & d1
+  amp_same_100: s2 & d2
+  amp_same_1000: s3 & d3
+  minus_0: s0 - o0
+  minus_10: s1 - o1
+  minus_100: s2 - o2
+  minus_1000: s3 - o3
+  minus_same_0: s0 - d0
+  minus_same_10: s1 - d1
+  minus_same_100: s2 - d2
+  minus_same_1000: s3 - d3
+  spaceship_0: s0 <=> o0
+  spaceship_diff_10: s1 <=> o1
+  spaceship_diff_100: s2 <=> o2
+  spaceship_diff_1000: s2 <=> o3
+  spaceship_sub_10: s1 <=> ss1
+  spaceship_sub_100: s2 <=> ss2
+  spaceship_sub_1000: s2 <=> ss3
+  spaceship_sup_10: ss1 <=> s1
+  spaceship_sup_100: ss2 <=> s2
+  spaceship_sup_1000: ss2 <=> s3
+  eq_0: s0 == o0
+  eq_10: s1 == o1
+  eq_100: s2 == o2
+  eq_1000: s3 == o3
+  eq_same_0: s0 == d0
+  eq_same_10: s1 == d1
+  eq_same_100: s2 == d2
+  eq_same_1000: s3 == d3
+  xor_0: s0 ^ o0
+  xor_10: s1 ^ o1
+  xor_100: s2 ^ o2
+  xor_1000: s3 ^ o3
+  xor_same_0: s0 ^ d0
+  xor_same_10: s1 ^ d1
+  xor_same_100: s2 ^ d2
+  xor_same_1000: s3 ^ d3
+  pipe_0: s0 | o0
+  pipe_10: s1 | o1
+  pipe_100: s2 | o2
+  pipe_1000: s3 | o3
+  pipe_same_0: s0 | d0
+  pipe_same_10: s1 | d1
+  pipe_same_100: s2 | d2
+  pipe_same_1000: s3 | d3
+  add: a3.each { s0.add(it) }
+  add_exist: a3.each { s3.add(it) }
+  addq: a3.each { s0.add?(it) }
+  addq_exist: a3.each { s3.add?(it) }
+  classify_0: s0.classify { it }
+  classify_10: s1.classify { it & 2 }
+  classify_100: s2.classify { it & 8 }
+  classify_1000: s3.classify { it & 32 }
+  clear: s0.clear
+  collect_0: s0.collect! { it }
+  collect_10: s1.collect! { it }
+  collect_100: s2.collect! { it }
+  collect_1000: s3.collect! { it }
+  compare_by_identity_0: s0.dup.compare_by_identity
+  compare_by_identity_10: s1.dup.compare_by_identity
+  compare_by_identity_100: s2.dup.compare_by_identity
+  compare_by_identity_1000: s3.dup.compare_by_identity
+  compare_by_identityq_false: s0.compare_by_identity?
+  compare_by_identityq_true: cbi.compare_by_identity?
+  clone_0: s0.clone
+  clone_10: s1.clone
+  clone_100: s2.clone
+  clone_1000: s3.clone
+  delete: a3.each { s3.delete(it) }
+  delete_not_exist: a3.each { o3.delete(it) }
+  deleteq: a3.each { s3.delete?(it) }
+  deleteq_not_exist: a3.each { o3.delete?(it) }
+  delete_if_0: s0.delete_if { it }
+  delete_if_10: s1.delete_if { it & 2 == 0 }
+  delete_if_100: s2.delete_if { it & 2 == 0 }
+  delete_if_1000: s3.delete_if { it & 2 == 0 }
+  disjoint_0: s0.disjoint? o0
+  disjoint_10: s1.disjoint? o1
+  disjoint_100: s2.disjoint? o2
+  disjoint_1000: s3.disjoint? o3
+  disjoint_same_0: s0.disjoint? d0
+  disjoint_same_10: s1.disjoint? d1
+  disjoint_same_100: s2.disjoint? d2
+  disjoint_same_1000: s3.disjoint? d3
+  divide_1arity_0: s0.divide { true }
+  divide_1arity_10: s1.divide { it & 2 }
+  divide_1arity_100: s2.divide { it & 8 }
+  divide_1arity_1000: s3.divide { it & 32 }
+  divide_2arity_0: s0.divide { true }
+  divide_2arity_10: s1.divide { (_1 & 2) == (_2 & 2) }
+  divide_2arity_100: s2.divide { (_1 & 8) == (_2 & 8) }
+  divide_2arity_1000: s3.divide { (_1 & 32) == (_2 & 32) }
+  dup_0: s0.dup
+  dup_10: s1.dup
+  dup_100: s2.dup
+  dup_1000: s3.dup
+  each_0: s0.each { it }
+  each_10: s1.each { it }
+  each_100: s2.each { it }
+  each_1000: s3.each { it }
+  empty_true: s0.empty?
+  empty_false: s3.empty?
+  flatten: ns.flatten
+  flattenb: ns.flatten!
+  include_true_0: s0.include? member
+  include_true_10: s1.include? member
+  include_true_100: s2.include? member
+  include_true_1000: s3.include? member
+  include_false_0: s0.include?(-1)
+  include_false_10: s1.include?(-1)
+  include_false_100: s2.include?(-1)
+  include_false_1000: s3.include?(-1)
+  intersect_0: s0.intersect? o0
+  intersect_10: s1.intersect? o1
+  intersect_100: s2.intersect? o2
+  intersect_1000: s3.intersect? o3
+  intersect_same_0: s0.intersect? d0
+  intersect_same_10: s1.intersect? d1
+  intersect_same_100: s2.intersect? d2
+  intersect_same_1000: s3.intersect? d3
+  join_0: s0.join
+  join_10: s1.join
+  join_100: s2.join
+  join_1000: s3.join
+  join_arg_0: s0.join ""
+  join_arg_10: s1.join ""
+  join_arg_100: s2.join ""
+  join_arg_1000: s3.join ""
+  keep_if_0: s0.keep_if { it }
+  keep_if_10: s1.keep_if { it & 2 == 0 }
+  keep_if_100: s2.keep_if { it & 2 == 0 }
+  keep_if_1000: s3.keep_if { it & 2 == 0 }
+  merge_set: s0.dup.merge(s3, o3)
+  merge_enum: s0.dup.merge(array1, array2)
+  proper_subset_0: s0.proper_subset? s0
+  proper_subset_10: s1.proper_subset? ss1
+  proper_subset_100: s2.proper_subset? ss2
+  proper_subset_1000: s3.proper_subset? ss3
+  proper_subset_false_10: s1.proper_subset? os1
+  proper_subset_false_100: s2.proper_subset? os2
+  proper_subset_false_1000: s3.proper_subset? os3
+  proper_superset_0: s0.proper_superset? s0
+  proper_superset_10: ss1.proper_superset? s1
+  proper_superset_100: ss2.proper_superset? s2
+  proper_superset_1000: ss3.proper_superset? s3
+  proper_superset_false_10: os1.proper_superset? s1
+  proper_superset_false_100: os2.proper_superset? s2
+  proper_superset_false_1000: os3.proper_superset? s3
+  reject_0: s0.reject! { it }
+  reject_10: s1.reject! { it & 2 == 0 }
+  reject_100: s2.reject! { it & 2 == 0 }
+  reject_1000: s3.reject! { it & 2 == 0 }
+  replace_0: s = Set.new; array1.each { s.replace(s0) }
+  replace_10: s = Set.new; array1.each { s.replace(s1) }
+  replace_100: s = Set.new; array1.each { s.replace(s2) }
+  replace_1000: s = Set.new; array1.each { s.replace(s3) }
+  reset_0: s0.reset
+  reset_10: s1.reset
+  reset_100: s2.reset
+  reset_1000: s3.reset
+  select_0: s0.select! { it }
+  select_10: s1.select! { it & 2 == 0 }
+  select_100: s2.select! { it & 2 == 0 }
+  select_1000: s3.select! { it & 2 == 0 }
+  size_0: s0.size
+  size_10: s1.size
+  size_100: s2.size
+  size_1000: s3.size
+  subtract_set: s3.dup.subtract(os3)
+  subtract_enum: s3.dup.subtract(oa3)
+  subtract_same_set: s3.dup.subtract(s3)
+  subtract_same_enum: s3.dup.subtract(a3)
+  subset_0: s0.subset? s0
+  subset_10: s1.subset? ss1
+  subset_100: s2.subset? ss2
+  subset_1000: s3.subset? ss3
+  subset_false_10: s1.subset? os1
+  subset_false_100: s2.subset? os2
+  subset_false_1000: s3.subset? os3
+  superset_0: s0.superset? s0
+  superset_10: ss1.superset? s1
+  superset_100: ss2.superset? s2
+  superset_1000: ss3.superset? s3
+  superset_false_10: os1.superset? s1
+  superset_false_100: os2.superset? s2
+  superset_false_1000: os3.superset? s3
+  to_a_0: s0.to_a
+  to_a_10: s1.to_a
+  to_a_100: s2.to_a
+  to_a_1000: s3.to_a
+  to_set_0: s0.to_set
+  to_set_10: s1.to_set
+  to_set_100: s2.to_set
+  to_set_1000: s3.to_set
diff --git a/benchmark/so_count_words.yml b/benchmark/so_count_words.yml
index 99683505f9..f7322a8541 100644
--- a/benchmark/so_count_words.yml
+++ b/benchmark/so_count_words.yml
@@ -15,13 +15,13 @@ prelude: |
   Newsgroups:   rec.games.roguelike.nethack
   X-Mailer:     Mozilla 1.1N (Macintosh; I; 68K)
 
-  Hello there, Izchak Miller was my father.  When I was younger I spent 
-  many a night, hunched over the keyboard with a cup of tea, playing 
-  nethack with him and my brother.  my dad was a philosopher with a strong 
-  weakness for fantasy/sci fi.  I remember when he started to get involved 
-  with the Nethack team- my brother's Dungeons and Dragons monster book 
-  found a regular place beside my dad's desk. it's nice to see him living 
-  on in the game he loved so much :-).  
+  Hello there,  Izchak Miller was my  father.  When I was  younger I spent
+  many  a night,  hunched over  the keyboard  with a  cup of  tea, playing
+  nethack with him and my brother.  my dad was a philosopher with a strong
+  weakness for fantasy/sci fi.  I remember when he started to get involved
+  with the  Nethack team- my  brother's Dungeons and Dragons  monster book
+  found a regular place beside my dad's  desk. it's nice to see him living
+  on in the game he loved so much :-).
                                                                     Tamar Miller
 
   The following is a really long word of 5000 characters:
@@ -38,8 +38,9 @@ prelude: |
       13.times{
         data << data
       }
-      open(wcinput, 'w'){|f| f.write data}
+      File.write(wcinput, data)
     end
+    at_exit {File.unlink(wcinput) rescue nil}
   end
 
   prepare_wc_input(wc_input_base)
@@ -49,16 +50,16 @@ benchmark:
     # $Id: wc-ruby.code,v 1.4 2004/11/13 07:43:32 bfulgham Exp $
     # http://www.bagley.org/~doug/shootout/
     # with help from Paul Brannan
-    input = open(File.join(File.dirname($0), 'wc.input'), 'rb')
 
     nl = nw = nc = 0
-    while true
-      tmp = input.read(4096) or break
-      data = tmp << (input.gets || "")
-      nc += data.length
-      nl += data.count("\n")
-      ((data.strip! || data).tr!("\n", " ") || data).squeeze!
-      nw += data.count(" ") + 1
+    File.open(File.join(File.dirname($0), 'wc.input'), 'rb') do |input|
+      while tmp = input.read(4096)
+        data = tmp << (input.gets || "")
+        nc += data.length
+        nl += data.count("\n")
+        ((data.strip! || data).tr!("\n", " ") || data).squeeze!
+        nw += data.count(" ") + 1
+      end
     end
     # STDERR.puts "#{nl} #{nw} #{nc}"
 
diff --git a/benchmark/so_meteor_contest.rb b/benchmark/so_meteor_contest.rb
index 8c136baa6c..d8c8e3ab9c 100644
--- a/benchmark/so_meteor_contest.rb
+++ b/benchmark/so_meteor_contest.rb
@@ -447,7 +447,7 @@ end
 #   as an inverse.  The inverse will ALWAYS be 3 one of the piece configurations that is exactly 3 rotations away
 #   (an odd number).  Checking even vs odd then produces a higher probability of finding more pieces earlier
 #   in the cycle.  We still need to keep checking all the permutations, but our probability of finding one will
-#   diminsh over time.  Since we are TOLD how many to search for this lets us exit before checking all pieces
+#   diminish over time.  Since we are TOLD how many to search for this lets us exit before checking all pieces
 #   this bennifit is very great when seeking small numbers of solutions and is 0 when looking for more than the
 #   maximum number
 def find_top( rotation_skip)
diff --git a/benchmark/so_nbody.rb b/benchmark/so_nbody.rb
index d6c5bb9e61..9884fc4edc 100644
--- a/benchmark/so_nbody.rb
+++ b/benchmark/so_nbody.rb
@@ -12,38 +12,38 @@ def _puts *args
 end
 
 class Planet
- attr_accessor :x, :y, :z, :vx, :vy, :vz, :mass
+  attr_accessor :x, :y, :z, :vx, :vy, :vz, :mass
 
- def initialize(x, y, z, vx, vy, vz, mass)
-  @x, @y, @z = x, y, z
-  @vx, @vy, @vz = vx * DAYS_PER_YEAR, vy * DAYS_PER_YEAR, vz * DAYS_PER_YEAR
-  @mass = mass * SOLAR_MASS
- end
-
- def move_from_i(bodies, nbodies, dt, i)
-  while i < nbodies
-   b2 = bodies[i]
-   dx = @x - b2.x
-   dy = @y - b2.y
-   dz = @z - b2.z
-
-   distance = Math.sqrt(dx * dx + dy * dy + dz * dz)
-   mag = dt / (distance * distance * distance)
-   b_mass_mag, b2_mass_mag = @mass * mag, b2.mass * mag
-
-   @vx -= dx * b2_mass_mag
-   @vy -= dy * b2_mass_mag
-   @vz -= dz * b2_mass_mag
-   b2.vx += dx * b_mass_mag
-   b2.vy += dy * b_mass_mag
-   b2.vz += dz * b_mass_mag
-   i += 1
+  def initialize(x, y, z, vx, vy, vz, mass)
+    @x, @y, @z = x, y, z
+    @vx, @vy, @vz = vx * DAYS_PER_YEAR, vy * DAYS_PER_YEAR, vz * DAYS_PER_YEAR
+    @mass = mass * SOLAR_MASS
   end
 
-  @x += dt * @vx
-  @y += dt * @vy
-  @z += dt * @vz
- end
+  def move_from_i(bodies, nbodies, dt, i)
+    while i < nbodies
+      b2 = bodies[i]
+      dx = @x - b2.x
+      dy = @y - b2.y
+      dz = @z - b2.z
+
+      distance = Math.sqrt(dx * dx + dy * dy + dz * dz)
+      mag = dt / (distance * distance * distance)
+      b_mass_mag, b2_mass_mag = @mass * mag, b2.mass * mag
+
+      @vx -= dx * b2_mass_mag
+      @vy -= dy * b2_mass_mag
+      @vz -= dz * b2_mass_mag
+      b2.vx += dx * b_mass_mag
+      b2.vy += dy * b_mass_mag
+      b2.vz += dz * b_mass_mag
+      i += 1
+    end
+
+    @x += dt * @vx
+    @y += dt * @vy
+    @z += dt * @vz
+  end
 end
 
 def energy(bodies)
diff --git a/benchmark/string_casecmp.yml b/benchmark/string_casecmp.yml
index 2354040a04..88a3555c8a 100644
--- a/benchmark/string_casecmp.yml
+++ b/benchmark/string_casecmp.yml
@@ -20,7 +20,9 @@ benchmark:
   casecmp-10: lstr10.casecmp(ustr10)
   casecmp-100: lstr100.casecmp(ustr100)
   casecmp-1000: lstr1000.casecmp(ustr1000)
+  casecmp-1000vs10: lstr1000.casecmp(ustr10)
   casecmp-nonascii1: lnonascii1.casecmp(unonascii1)
   casecmp-nonascii10: lnonascii10.casecmp(unonascii10)
   casecmp-nonascii100: lnonascii100.casecmp(unonascii100)
   casecmp-nonascii1000: lnonascii1000.casecmp(unonascii1000)
+  casecmp-nonascii1000vs10: lnonascii1000.casecmp(unonascii10)
diff --git a/benchmark/string_concat.yml b/benchmark/string_concat.yml
new file mode 100644
index 0000000000..f11f95ee9a
--- /dev/null
+++ b/benchmark/string_concat.yml
@@ -0,0 +1,51 @@
+prelude: |
+  CHUNK = "a" * 64
+  UCHUNK = "é" * 32
+  SHORT = "a" * (GC::INTERNAL_CONSTANTS[:BASE_SLOT_SIZE] / 2)
+  LONG = "a" * (GC::INTERNAL_CONSTANTS[:BASE_SLOT_SIZE] * 2)
+  GC.disable # GC causes a lot of variance
+benchmark:
+  binary_concat_7bit: |
+    buffer = String.new(capacity: 4096, encoding: Encoding::BINARY)
+    buffer << CHUNK << CHUNK << CHUNK << CHUNK << CHUNK << CHUNK << CHUNK << CHUNK
+    buffer << CHUNK << CHUNK << CHUNK << CHUNK << CHUNK << CHUNK << CHUNK << CHUNK
+    buffer << CHUNK << CHUNK << CHUNK << CHUNK << CHUNK << CHUNK << CHUNK << CHUNK
+    buffer << CHUNK << CHUNK << CHUNK << CHUNK << CHUNK << CHUNK << CHUNK << CHUNK
+    buffer << CHUNK << CHUNK << CHUNK << CHUNK << CHUNK << CHUNK << CHUNK << CHUNK
+    buffer << CHUNK << CHUNK << CHUNK << CHUNK << CHUNK << CHUNK << CHUNK << CHUNK
+    buffer << CHUNK << CHUNK << CHUNK << CHUNK << CHUNK << CHUNK << CHUNK << CHUNK
+    buffer << CHUNK << CHUNK << CHUNK << CHUNK << CHUNK << CHUNK << CHUNK
+  utf8_concat_7bit: |
+    buffer = String.new(capacity: 4096, encoding: Encoding::UTF_8)
+    buffer << CHUNK << CHUNK << CHUNK << CHUNK << CHUNK << CHUNK << CHUNK << CHUNK
+    buffer << CHUNK << CHUNK << CHUNK << CHUNK << CHUNK << CHUNK << CHUNK << CHUNK
+    buffer << CHUNK << CHUNK << CHUNK << CHUNK << CHUNK << CHUNK << CHUNK << CHUNK
+    buffer << CHUNK << CHUNK << CHUNK << CHUNK << CHUNK << CHUNK << CHUNK << CHUNK
+    buffer << CHUNK << CHUNK << CHUNK << CHUNK << CHUNK << CHUNK << CHUNK << CHUNK
+    buffer << CHUNK << CHUNK << CHUNK << CHUNK << CHUNK << CHUNK << CHUNK << CHUNK
+    buffer << CHUNK << CHUNK << CHUNK << CHUNK << CHUNK << CHUNK << CHUNK << CHUNK
+    buffer << CHUNK << CHUNK << CHUNK << CHUNK << CHUNK << CHUNK << CHUNK
+  utf8_concat_UTF8: |
+    buffer = String.new(capacity: 4096, encoding: Encoding::UTF_8)
+    buffer << UCHUNK << UCHUNK << UCHUNK << UCHUNK << UCHUNK << UCHUNK << UCHUNK << UCHUNK
+    buffer << UCHUNK << UCHUNK << UCHUNK << UCHUNK << UCHUNK << UCHUNK << UCHUNK << UCHUNK
+    buffer << UCHUNK << UCHUNK << UCHUNK << UCHUNK << UCHUNK << UCHUNK << UCHUNK << UCHUNK
+    buffer << UCHUNK << UCHUNK << UCHUNK << UCHUNK << UCHUNK << UCHUNK << UCHUNK << UCHUNK
+    buffer << UCHUNK << UCHUNK << UCHUNK << UCHUNK << UCHUNK << UCHUNK << UCHUNK << UCHUNK
+    buffer << UCHUNK << UCHUNK << UCHUNK << UCHUNK << UCHUNK << UCHUNK << UCHUNK << UCHUNK
+    buffer << UCHUNK << UCHUNK << UCHUNK << UCHUNK << UCHUNK << UCHUNK << UCHUNK << UCHUNK
+    buffer << UCHUNK << UCHUNK << UCHUNK << UCHUNK << UCHUNK << UCHUNK << UCHUNK
+  interpolation: |
+    buffer = "#{CHUNK}#{CHUNK}#{CHUNK}#{CHUNK}#{CHUNK}#{CHUNK}#{CHUNK}#{CHUNK}#{CHUNK}#{CHUNK}" \
+      "#{CHUNK}#{CHUNK}#{CHUNK}#{CHUNK}#{CHUNK}#{CHUNK}#{CHUNK}#{CHUNK}#{CHUNK}#{CHUNK}" \
+      "#{CHUNK}#{CHUNK}#{CHUNK}#{CHUNK}#{CHUNK}#{CHUNK}#{CHUNK}#{CHUNK}#{CHUNK}#{CHUNK}" \
+      "#{CHUNK}#{CHUNK}#{CHUNK}#{CHUNK}#{CHUNK}#{CHUNK}#{CHUNK}#{CHUNK}#{CHUNK}#{CHUNK}" \
+      "#{CHUNK}#{CHUNK}#{CHUNK}#{CHUNK}#{CHUNK}#{CHUNK}#{CHUNK}#{CHUNK}#{CHUNK}#{CHUNK}" \
+      "#{CHUNK}#{CHUNK}#{CHUNK}#{CHUNK}#{CHUNK}#{CHUNK}#{CHUNK}#{CHUNK}#{CHUNK}#{CHUNK}" \
+      "#{CHUNK}#{CHUNK}#{CHUNK}#{CHUNK}#{CHUNK}#{CHUNK}#{CHUNK}#{CHUNK}#{CHUNK}#{CHUNK}" \
+      "#{CHUNK}#{CHUNK}#{CHUNK}#{CHUNK}#{CHUNK}#{CHUNK}#{CHUNK}#{CHUNK}#{CHUNK}#{CHUNK}" \
+      "#{CHUNK}#{CHUNK}#{CHUNK}#{CHUNK}#{CHUNK}#{CHUNK}#{CHUNK}#{CHUNK}#{CHUNK}"
+  interpolation_same_heap: |
+    buffer = "#{SHORT}#{SHORT}"
+  interpolation_switching_heaps: |
+    buffer = "#{SHORT}#{LONG}"
diff --git a/benchmark/string_dup.yml b/benchmark/string_dup.yml
new file mode 100644
index 0000000000..90793f9f2a
--- /dev/null
+++ b/benchmark/string_dup.yml
@@ -0,0 +1,7 @@
+prelude: |
+  # frozen_string_literal: true
+benchmark:
+  uplus: |
+    +"A"
+  dup: |
+    "A".dup
diff --git a/benchmark/string_fstring.yml b/benchmark/string_fstring.yml
new file mode 100644
index 0000000000..cafef1f3fe
--- /dev/null
+++ b/benchmark/string_fstring.yml
@@ -0,0 +1,16 @@
+benchmark:
+  fstring_random: |
+    i = 0
+    str = "same".dup
+    while i < 5_000_000
+      -(i.to_s.freeze)
+      i += 1
+    end
+  fstring_same: |
+    i = 0
+    str = "same".dup
+    while i < 10_000_000
+      -str
+      i += 1
+    end
+loop_count: 1
diff --git a/benchmark/string_gsub.yml b/benchmark/string_gsub.yml
new file mode 100644
index 0000000000..0f964337dd
--- /dev/null
+++ b/benchmark/string_gsub.yml
@@ -0,0 +1,43 @@
+prelude: |
+  # frozen_string_literal: true
+  STR = ((("a" * 31) + "<") * 1000).freeze
+  STR_UNICODE = ((("a" * 30) + "\u2028") * 1000).freeze
+  ESCAPED_CHARS_BINARY = {
+    "\u2028".b => '\u2028'.b,
+    "\u2029".b => '\u2029'.b,
+    ">".b => '\u003e'.b.freeze,
+    "<".b => '\u003c'.b.freeze,
+    "&".b => '\u0026'.b.freeze,
+  }
+  BINARY_PATTERN = Regexp.union(ESCAPED_CHARS_BINARY.keys)
+
+  ESCAPED_CHARS = {
+    "\u2028" => '\u2028',
+    "\u2029" => '\u2029',
+    ">" => '\u003e',
+    "<" => '\u003c',
+    "&" => '\u0026',
+  }
+  ESCAPE_PATTERN = Regexp.union(ESCAPED_CHARS.keys)
+
+
+benchmark:
+  escape: |
+    str = STR.dup
+    str.gsub!(ESCAPE_PATTERN, ESCAPED_CHARS)
+    str
+
+  escape_bin: |
+    str = STR.b
+    str.gsub!(BINARY_PATTERN, ESCAPED_CHARS_BINARY)
+    str.force_encoding(Encoding::UTF_8)
+
+  escape_utf8: |
+    str = STR_UNICODE.dup
+    str.gsub!(ESCAPE_PATTERN, ESCAPED_CHARS)
+    str
+
+  escape_utf8_bin: |
+    str = STR_UNICODE.b
+    str.gsub!(BINARY_PATTERN, ESCAPED_CHARS_BINARY)
+    str.force_encoding(Encoding::UTF_8)
diff --git a/benchmark/string_rpartition.yml b/benchmark/string_rpartition.yml
new file mode 100644
index 0000000000..37e9d1b071
--- /dev/null
+++ b/benchmark/string_rpartition.yml
@@ -0,0 +1,18 @@
+prelude: |
+  str1 = [*"a".."z",*"0".."9"].join("")
+  str10 = str1 * 10 + ":"
+  str100 = str1 * 100 + ":"
+  str1000 = str1 * 1000 + ":"
+  nonascii1 = [*"\u{e0}".."\u{ff}"].join("")
+  nonascii10 = nonascii1 * 10 + ":"
+  nonascii100 = nonascii1 * 100 + ":"
+  nonascii1000 = nonascii1 * 1000 + ":"
+benchmark:
+  rpartition-1: str1.rpartition(":")
+  rpartition-10: str10.rpartition(":")
+  rpartition-100: str100.rpartition(":")
+  rpartition-1000: str1000.rpartition(":")
+  rpartition-nonascii1: nonascii1.rpartition(":")
+  rpartition-nonascii10: nonascii10.rpartition(":")
+  rpartition-nonascii100: nonascii100.rpartition(":")
+  rpartition-nonascii1000: nonascii1000.rpartition(":")
diff --git a/benchmark/struct_accessor.yml b/benchmark/struct_accessor.yml
new file mode 100644
index 0000000000..d95240e2dd
--- /dev/null
+++ b/benchmark/struct_accessor.yml
@@ -0,0 +1,37 @@
+prelude: |
+  C = Struct.new(:x) do
+    def initialize(...)
+      super
+      @ivar = 42
+    end
+
+    attr_accessor :ivar
+
+    class_eval <<-END
+      def r
+        #{'x;'*256}
+      end
+      def w
+        #{'self.x = nil;'*256}
+      end
+      def rm
+        m = method(:x)
+        #{'m.call;'*256}
+      end
+      def wm
+        m = method(:x=)
+        #{'m.call(nil);'*256}
+      end
+      def r_ivar
+        #{'ivar;'*256}
+      end
+    END
+  end
+  C.new(nil) # ensure common shape is known
+  obj = C.new(nil)
+benchmark:
+  member_reader: "obj.r"
+  member_writer: "obj.w"
+  member_reader_method: "obj.rm"
+  member_writer_method: "obj.wm"
+  ivar_reader: "obj.r_ivar"
diff --git a/benchmark/time_now.yml b/benchmark/time_now.yml
index f6d6a31489..9336877cd4 100644
--- a/benchmark/time_now.yml
+++ b/benchmark/time_now.yml
@@ -1,3 +1,4 @@
 benchmark:
   - 'Time.now'
   - 'Time.now(in: "+09:00")'
+  - 'Time.now.year'
diff --git a/benchmark/time_parse.yml b/benchmark/time_parse.yml
index a6d6948b9c..6060b58bc6 100644
--- a/benchmark/time_parse.yml
+++ b/benchmark/time_parse.yml
@@ -6,3 +6,5 @@ benchmark:
   - Time.iso8601(iso8601)
   - Time.parse(iso8601)
   - Time.parse(inspect)
+  - Time.new(iso8601) rescue Time.iso8601(iso8601)
+  - Time.new(inspect) rescue Time.parse(inspect)
diff --git a/benchmark/time_strftime.yml b/benchmark/time_strftime.yml
new file mode 100644
index 0000000000..28f62aec87
--- /dev/null
+++ b/benchmark/time_strftime.yml
@@ -0,0 +1,7 @@
+prelude: |
+  # frozen_string_literal: true
+  time = Time.now
+benchmark:
+  - time.strftime("%FT%T")     # 19B
+  - time.strftime("%FT%T.%3N") # 23B
+  - time.strftime("%FT%T.%6N") # 26B
diff --git a/benchmark/time_xmlschema.yml b/benchmark/time_xmlschema.yml
new file mode 100644
index 0000000000..654e5cfcbc
--- /dev/null
+++ b/benchmark/time_xmlschema.yml
@@ -0,0 +1,27 @@
+prelude: |
+  # frozen_string_literal
+  unless Time.method_defined?(:xmlschema)
+    class Time
+      def xmlschema(fraction_digits=0)
+        fraction_digits = fraction_digits.to_i
+        s = strftime("%FT%T")
+        if fraction_digits > 0
+          s << strftime(".%#{fraction_digits}N")
+        end
+        s << (utc? ? 'Z' : strftime("%:z"))
+      end
+    end
+  end
+  time = Time.now
+  utc_time = Time.now.utc
+  fraction_sec = Time.at(123456789.quo(9999999999)).getlocal("+09:00")
+  future_time = Time.utc(10000)
+benchmark:
+  - time.xmlschema
+  - utc_time.xmlschema
+  - time.xmlschema(6)
+  - utc_time.xmlschema(6)
+  - time.xmlschema(9)
+  - utc_time.xmlschema(9)
+  - fraction_sec.xmlschema(10)
+  - future_time.xmlschema
diff --git a/benchmark/vm_call_bmethod.yml b/benchmark/vm_call_bmethod.yml
new file mode 100644
index 0000000000..40136e5aa4
--- /dev/null
+++ b/benchmark/vm_call_bmethod.yml
@@ -0,0 +1,37 @@
+prelude: |
+  define_method(:a0){}
+  define_method(:a1){|a| a}
+  define_method(:s){|*a| a}
+  define_method(:b){|kw: 1| kw}
+
+  t0 = 0.times.to_a
+  t1 = 1.times.to_a
+  t10 = 10.times.to_a
+  t100 = 100.times.to_a
+  kw = {kw: 2}
+benchmark:
+  bmethod_simple_0: |
+    a0
+  bmethod_simple_1: |
+    a1(1)
+  bmethod_simple_0_splat: |
+    a0(*t0)
+  bmethod_simple_1_splat: |
+    a1(*t1)
+  bmethod_no_splat: |
+    s
+  bmethod_0_splat: |
+    s(*t0)
+  bmethod_1_splat: |
+    s(*t1)
+  bmethod_10_splat: |
+    s(*t10)
+  bmethod_100_splat: |
+    s(*t100)
+  bmethod_kw: |
+    b(kw: 1)
+  bmethod_no_kw: |
+    b
+  bmethod_kw_splat: |
+    b(**kw)
+loop_count: 6000000
diff --git a/benchmark/vm_call_kw_and_kw_splat.yml b/benchmark/vm_call_kw_and_kw_splat.yml
new file mode 100644
index 0000000000..aa6e549e0c
--- /dev/null
+++ b/benchmark/vm_call_kw_and_kw_splat.yml
@@ -0,0 +1,25 @@
+prelude: |
+  h1, h10, h100, h1000 = [1, 10, 100, 1000].map do |n|
+    h = {kw: 1}
+    n.times{|i| h[i.to_s.to_sym] = i}
+    h
+  end
+  eh = {}
+  def kw(kw: nil, **kws) end
+benchmark:
+  1: |
+    kw(**h1)
+  1_mutable: |
+    kw(**eh, **h1)
+  10: |
+    kw(**h10)
+  10_mutable: |
+    kw(**eh, **h10)
+  100: |
+    kw(**h100)
+  100_mutable: |
+    kw(**eh, **h100)
+  1000: |
+    kw(**h1000)
+  1000_mutable: |
+    kw(**eh, **h1000)
diff --git a/benchmark/vm_call_method_missing.yml b/benchmark/vm_call_method_missing.yml
new file mode 100644
index 0000000000..f890796f11
--- /dev/null
+++ b/benchmark/vm_call_method_missing.yml
@@ -0,0 +1,62 @@
+prelude: |
+  class A0
+    def method_missing(m); m end
+  end
+  class A1
+    def method_missing(m, a) a; end
+  end
+  class S
+    def method_missing(m, *a) a; end
+  end
+  class B
+    def method_missing(m, kw: 1) kw end
+  end
+  class SB
+    def method_missing(m, *a, kw: 1) kw end
+  end
+
+  t0 = 0.times.to_a
+  t1 = 1.times.to_a
+  t10 = 10.times.to_a
+  t200 = 200.times.to_a
+  kw = {kw: 2}
+
+  a0 = A0.new
+  a1 = A1.new
+  s = S.new
+  b = B.new
+  sb = SB.new
+benchmark:
+  method_missing_simple_0: |
+    a0.()
+  method_missing_simple_1: |
+    a1.x(1)
+  method_missing_simple_0_splat: |
+    a0.(*t0)
+  method_missing_simple_1_splat: |
+    a1.(*t1)
+  method_missing_no_splat: |
+    s.()
+  method_missing_0_splat: |
+    s.(*t0)
+  method_missing_1_splat: |
+    s.(*t1)
+  method_missing_10_splat: |
+    s.(*t10)
+  method_missing_200_splat: |
+    s.(*t200)
+  method_missing_kw: |
+    b.(kw: 1)
+  method_missing_no_kw: |
+    b.()
+  method_missing_kw_splat: |
+    b.(**kw)
+  method_missing_0_splat_kw: |
+    sb.(*t0, **kw)
+  method_missing_1_splat_kw: |
+    sb.(*t1, **kw)
+  method_missing_10_splat_kw: |
+    sb.(*t10, **kw)
+  method_missing_200_splat_kw: |
+    sb.(*t200, **kw)
+loop_count: 1000000
diff --git a/benchmark/vm_call_send_iseq.yml b/benchmark/vm_call_send_iseq.yml
new file mode 100644
index 0000000000..60ff23c475
--- /dev/null
+++ b/benchmark/vm_call_send_iseq.yml
@@ -0,0 +1,77 @@
+prelude: |
+  def a0; end
+  def a1(a) a; end
+  def s(*a) a; end
+  def b(kw: 1) kw end
+  def sb(*a, kw: 1) kw end
+
+  t0 = 0.times.to_a
+  t1 = 1.times.to_a
+  t10 = 10.times.to_a
+  t200 = 200.times.to_a
+
+  a0_t0 = [:a0, *t0]
+  a1_t1 = [:a1, *t1]
+  s_t0 = [:s, *t0]
+  s_t1 = [:s, *t1]
+  s_t10 = [:s, *t10]
+  s_t200 = [:s, *t200]
+  sb_t0 = [:sb, *t0]
+  sb_t1 = [:sb, *t1]
+  sb_t10 = [:sb, *t10]
+  sb_t200 = [:sb, *t200]
+  kw = {kw: 2}
+benchmark:
+  send_simple_0: |
+    send(:a0)
+  send_simple_1: |
+    send(:a1, 1)
+  send_simple_0_splat: |
+    send(:a0, *t0)
+  send_simple_1_splat: |
+    send(:a1, *t1)
+  send_simple_0_splat_comb: |
+    send(*a0_t0)
+  send_simple_1_splat_comb: |
+    send(*a1_t1)
+  send_no_splat: |
+    send(:s)
+  send_0_splat: |
+    send(:s, *t0)
+  send_1_splat: |
+    send(:s, *t1)
+  send_10_splat: |
+    send(:s, *t10)
+  send_200_splat: |
+    send(:s, *t200)
+  send_0_splat_comb: |
+    send(*s_t0)
+  send_1_splat_comb: |
+    send(*s_t1)
+  send_10_splat_comb: |
+    send(*s_t10)
+  send_200_splat_comb: |
+    send(*s_t200)
+  send_kw: |
+    send(:b, kw: 1)
+  send_no_kw: |
+    send(:b)
+  send_kw_splat: |
+    send(:b, **kw)
+  send_0_splat_kw: |
+    send(:sb, *t0, **kw)
+  send_1_splat_kw: |
+    send(:sb, *t1, **kw)
+  send_10_splat_kw: |
+    send(:sb, *t10, **kw)
+  send_200_splat_kw: |
+    send(:sb, *t200, **kw)
+  send_0_splat_comb_kw: |
+    send(*sb_t0, **kw)
+  send_1_splat_comb_kw: |
+    send(*sb_t1, **kw)
+  send_10_splat_comb_kw: |
+    send(*sb_t10, **kw)
+  send_200_splat_comb_kw: |
+    send(*sb_t200, **kw)
+loop_count: 3000000
diff --git a/benchmark/vm_call_symproc.yml b/benchmark/vm_call_symproc.yml
new file mode 100644
index 0000000000..16e0ac579e
--- /dev/null
+++ b/benchmark/vm_call_symproc.yml
@@ -0,0 +1,83 @@
+prelude: |
+  def self.a0; end
+  def self.a1(a) a; end
+  def self.s(*a) a; end
+  def self.b(kw: 1) kw end
+  def self.sb(*a, kw: 1) kw end
+
+  t0 = 0.times.to_a
+  t1 = 1.times.to_a
+  t10 = 10.times.to_a
+  t200 = 200.times.to_a
+
+  a0_t0 = [self, *t0]
+  a1_t1 = [self, *t1]
+  s_t0 = [self, *t0]
+  s_t1 = [self, *t1]
+  s_t10 = [self, *t10]
+  s_t200 = [self, *t200]
+  sb_t0 = [self, *t0]
+  sb_t1 = [self, *t1]
+  sb_t10 = [self, *t10]
+  sb_t200 = [self, *t200]
+  kw = {kw: 2}
+
+  a0 = :a0.to_proc
+  a1 = :a1.to_proc
+  s = :s.to_proc
+  b = :b.to_proc
+  sb = :sb.to_proc
+benchmark:
+  symproc_simple_0: |
+    a0.(self)
+  symproc_simple_1: |
+    a1.(self, 1)
+  symproc_simple_0_splat: |
+    a0.(self, *t0)
+  symproc_simple_1_splat: |
+    a1.(self, *t1)
+  symproc_simple_0_splat_comb: |
+    a0.(*a0_t0)
+  symproc_simple_1_splat_comb: |
+    a1.(*a1_t1)
+  symproc_no_splat: |
+    s.(self)
+  symproc_0_splat: |
+    s.(self, *t0)
+  symproc_1_splat: |
+    s.(self, *t1)
+  symproc_10_splat: |
+    s.(self, *t10)
+  symproc_200_splat: |
+    s.(self, *t200)
+  symproc_0_splat_comb: |
+    s.(*s_t0)
+  symproc_1_splat_comb: |
+    s.(*s_t1)
+  symproc_10_splat_comb: |
+    s.(*s_t10)
+  symproc_200_splat_comb: |
+    s.(*s_t200)
+  symproc_kw: |
+    b.(self, kw: 1)
+  symproc_no_kw: |
+    b.(self)
+  symproc_kw_splat: |
+    b.(self, **kw)
+  symproc_0_splat_kw: |
+    sb.(self, *t0, **kw)
+  symproc_1_splat_kw: |
+    sb.(self, *t1, **kw)
+  symproc_10_splat_kw: |
+    sb.(self, *t10, **kw)
+  symproc_200_splat_kw: |
+    sb.(self, *t200, **kw)
+  symproc_0_splat_comb_kw: |
+    sb.(*sb_t0, **kw)
+  symproc_1_splat_comb_kw: |
+    sb.(*sb_t1, **kw)
+  symproc_10_splat_comb_kw: |
+    sb.(*sb_t10, **kw)
+  symproc_200_splat_comb_kw: |
+    sb.(*sb_t200, **kw)
+loop_count: 1000000
diff --git a/benchmark/vm_const.yml b/benchmark/vm_const.yml
index 6064d4eed0..8939ca0cd3 100644
--- a/benchmark/vm_const.yml
+++ b/benchmark/vm_const.yml
@@ -1,7 +1,13 @@
 prelude: |
   Const = 1
+  A = B = C = D = E = F = G = H = I = J = K = L = M = N = O = P = Q = R = S = T = U = V = W = X = Y = Z = 1
+  def foo
+    A; B; C; D; E; F; G; H; I; J; K; L; M; N; O; P; Q; R; S; T; U; V; W; X; Y; Z
+  end
 benchmark:
   vm_const: |
     j = Const
     k = Const
+  vm_const_many: |
+    foo
 loop_count: 30000000
diff --git a/benchmark/vm_freezeobj.yml b/benchmark/vm_freezeobj.yml
new file mode 100644
index 0000000000..69a795a354
--- /dev/null
+++ b/benchmark/vm_freezeobj.yml
@@ -0,0 +1,6 @@
+prelude: |
+ objs = 100000.times.map { Object.new }
+benchmark:
+  vm_freeze_obj: |
+    objs.map(&:freeze)
+loop_count: 600
diff --git a/benchmark/vm_ivar_embedded_obj_init.yml b/benchmark/vm_ivar_embedded_obj_init.yml
new file mode 100644
index 0000000000..74fe20a630
--- /dev/null
+++ b/benchmark/vm_ivar_embedded_obj_init.yml
@@ -0,0 +1,14 @@
+prelude: |
+  class C
+    def set_ivars
+      @a = nil
+      @b = nil
+      @c = nil
+    end
+  end
+
+  c = C.new
+benchmark:
+  vm_ivar_embedded_obj_init: |
+    c.set_ivars
+loop_count: 30000000
diff --git a/benchmark/vm_ivar_extended_obj_init.yml b/benchmark/vm_ivar_extended_obj_init.yml
new file mode 100644
index 0000000000..f054bab282
--- /dev/null
+++ b/benchmark/vm_ivar_extended_obj_init.yml
@@ -0,0 +1,16 @@
+prelude: |
+  class C
+    def set_ivars
+      @a = nil
+      @b = nil
+      @c = nil
+      @d = nil
+      @e = nil
+    end
+  end
+
+  c = C.new
+benchmark:
+  vm_ivar_extended_obj_init: |
+    c.set_ivars
+loop_count: 30000000
diff --git a/benchmark/vm_ivar_generic_get.yml b/benchmark/vm_ivar_generic_get.yml
new file mode 100644
index 0000000000..dae2d37671
--- /dev/null
+++ b/benchmark/vm_ivar_generic_get.yml
@@ -0,0 +1,17 @@
+prelude: |
+  class C < Array
+    attr_reader :a, :b, :c
+    def initialize
+      @a = nil
+      @b = nil
+      @c = nil
+    end
+  end
+
+  c = C.new
+benchmark:
+  vm_ivar_generic_get: |
+    c.a
+    c.b
+    c.c
+loop_count: 30000000
diff --git a/benchmark/vm_ivar_generic_set.yml b/benchmark/vm_ivar_generic_set.yml
new file mode 100644
index 0000000000..102a6577fb
--- /dev/null
+++ b/benchmark/vm_ivar_generic_set.yml
@@ -0,0 +1,14 @@
+prelude: |
+  class C < Array
+    def set_ivars
+      @a = nil
+      @b = nil
+      @c = nil
+    end
+  end
+
+  c = C.new
+benchmark:
+  vm_ivar_generic_set: |
+    c.set_ivars
+loop_count: 30000000
diff --git a/benchmark/vm_ivar_get.yml b/benchmark/vm_ivar_get.yml
new file mode 100644
index 0000000000..1e0dad665f
--- /dev/null
+++ b/benchmark/vm_ivar_get.yml
@@ -0,0 +1,100 @@
+prelude: |
+  class Example
+    def initialize
+      @levar = 1
+      @v0 = 1
+      @v1 = 2
+      @v3 = 3
+    end
+
+    def get_value_loop
+      sum = 0
+
+      i = 0
+      while i < 100_000
+        # 10 times to de-emphasize loop overhead
+        sum += @levar
+        sum += @levar
+        sum += @levar
+        sum += @levar
+        sum += @levar
+        sum += @levar
+        sum += @levar
+        sum += @levar
+        sum += @levar
+        sum += @levar
+        i += 1
+      end
+
+      return sum
+    end
+
+    @levar = 1
+    @v0 = 1
+    @v1 = 2
+    @v3 = 3
+
+    def self.get_value_loop
+      sum = 0
+
+      i = 0
+      while i < 100_000
+        # 10 times to de-emphasize loop overhead
+        sum += @levar
+        sum += @levar
+        sum += @levar
+        sum += @levar
+        sum += @levar
+        sum += @levar
+        sum += @levar
+        sum += @levar
+        sum += @levar
+        sum += @levar
+        i += 1
+      end
+
+      return sum
+    end
+  end
+
+  class GenExample < Time
+    def initialize
+      @levar = 1
+      @v0 = 1
+      @v1 = 2
+      @v3 = 3
+    end
+
+    def get_value_loop
+      sum = 0
+
+      i = 0
+      while i < 100_000
+        # 10 times to de-emphasize loop overhead
+        sum += @levar
+        sum += @levar
+        sum += @levar
+        sum += @levar
+        sum += @levar
+        sum += @levar
+        sum += @levar
+        sum += @levar
+        sum += @levar
+        sum += @levar
+        i += 1
+      end
+
+      return sum
+    end
+  end
+
+  obj = Example.new
+  gen = GenExample.new
+benchmark:
+  vm_ivar_get_on_obj: |
+    obj.get_value_loop
+  vm_ivar_get_on_class: |
+    Example.get_value_loop
+  vm_ivar_get_on_generic: |
+    gen.get_value_loop
+loop_count: 100
diff --git a/benchmark/vm_ivar_get_unintialized.yml b/benchmark/vm_ivar_get_unintialized.yml
new file mode 100644
index 0000000000..a1ccfb06ce
--- /dev/null
+++ b/benchmark/vm_ivar_get_unintialized.yml
@@ -0,0 +1,12 @@
+prelude: |
+  class Example
+    def read
+      @uninitialized
+    end
+  end
+
+  obj = Example.new
+benchmark:
+  vm_ivar_get_uninitialized: |
+    obj.read
+loop_count: 30000000
diff --git a/benchmark/vm_ivar_ic_miss.yml b/benchmark/vm_ivar_ic_miss.yml
new file mode 100644
index 0000000000..944fb1a9e6
--- /dev/null
+++ b/benchmark/vm_ivar_ic_miss.yml
@@ -0,0 +1,20 @@
+prelude: |
+  class Foo
+    def initialize diverge
+      if diverge
+        @a = 1
+      end
+
+      @a0 = @a1 = @a2 = @a3 = @a4 = @a5 = @a6 = @a7 = @a8 = @a9 = @a10 = @a11 = @a12 = @a13 = @a14 = @a15 = @a16 = @a17 = @a18 = @a19 = @a20 = @a21 = @a22 = @a23 = @a24 = @a25 = @a26 = @a27 = @a28 = @a29 = @a30 = @a31 = @a32 = @a33 = @a34 = @a35 = @a36 = @a37 = @a38 = @a39 = @a40 = @a41 = @a42 = @a43 = @a44 = @a45 = @a46 = @a47 = @a48 = @a49 = @a50 = @a51 = @a52 = @a53 = @a54 = @a55 = @a56 = @a57 = @a58 = @a59 = @a60 = @a61 = @a62 = @a63 = @a64 = @a65 = @a66 = @a67 = @a68 = @a69 = @a70 = @a71 = @a72 = @a73 = @a74 = @b = 1
+    end
+
+    def b; @b; end
+  end
+
+  a = Foo.new false
+  b = Foo.new true
+benchmark:
+  vm_ivar_ic_miss: |
+    a.b
+    b.b
+loop_count: 30000000
diff --git a/benchmark/vm_ivar_init.yml b/benchmark/vm_ivar_init.yml
deleted file mode 100644
index c6f1633907..0000000000
--- a/benchmark/vm_ivar_init.yml
+++ /dev/null
@@ -1,14 +0,0 @@
-prelude: |
-  class C
-    def initialize
-      @a = nil
-      @b = nil
-      @c = nil
-      @d = nil
-      @e = nil
-    end
-  end
-benchmark:
-  vm_ivar_init: |
-    C.new
-loop_count: 30000000
diff --git a/benchmark/vm_ivar_lazy_set.yml b/benchmark/vm_ivar_lazy_set.yml
new file mode 100644
index 0000000000..7372ffcfbc
--- /dev/null
+++ b/benchmark/vm_ivar_lazy_set.yml
@@ -0,0 +1,12 @@
+prelude: |
+  class Example
+    def lazy_set
+      @uninitialized ||= 123
+    end
+  end
+
+  objs = 10000000.times.map { Example.new }
+benchmark:
+  vm_ivar_lazy_set: |
+    objs.each(&:lazy_set)
+loop_count: 1
diff --git a/benchmark/vm_ivar_memoize.yml b/benchmark/vm_ivar_memoize.yml
new file mode 100644
index 0000000000..90f6b07f05
--- /dev/null
+++ b/benchmark/vm_ivar_memoize.yml
@@ -0,0 +1,85 @@
+prelude: |
+  IVARS = 60
+  class Record
+    def initialize(offset = false)
+      @offset = 1 if offset
+      @first = 0
+      IVARS.times do |i|
+        instance_variable_set("@ivar_#{i}", i)
+      end
+    end
+
+    def first
+      @first
+    end
+
+    def lazy_set
+      @lazy_set ||= 123
+    end
+
+    def undef
+      @undef
+    end
+  end
+
+  Record.new # Need one alloc to right size
+
+  BASE = Record.new
+  LAZY = Record.new
+  LAZY.lazy_set
+
+  class Miss < Record
+    @first = 0
+    IVARS.times do |i|
+      instance_variable_set("@i_#{i}", i)
+    end
+  end
+
+  Miss.new # Need one alloc to right size
+  MISS = Miss.new
+
+  DIVERGENT = Record.new(true)
+
+benchmark:
+  vm_ivar_stable_shape: |
+    BASE.first
+    BASE.first
+    BASE.first
+    BASE.first
+    BASE.first
+    BASE.first
+  vm_ivar_memoize_unstable_shape: |
+    BASE.first
+    LAZY.first
+    BASE.first
+    LAZY.first
+    BASE.first
+    LAZY.first
+  vm_ivar_memoize_unstable_shape_miss: |
+    BASE.first
+    MISS.first
+    BASE.first
+    MISS.first
+    BASE.first
+    MISS.first
+  vm_ivar_unstable_undef: |
+    BASE.undef
+    LAZY.undef
+    BASE.undef
+    LAZY.undef
+    BASE.undef
+    LAZY.undef
+  vm_ivar_divergent_shape: |
+    BASE.first
+    DIVERGENT.first
+    BASE.first
+    DIVERGENT.first
+    BASE.first
+    DIVERGENT.first
+  vm_ivar_divergent_shape_imbalanced: |
+    BASE.first
+    DIVERGENT.first
+    DIVERGENT.first
+    DIVERGENT.first
+    DIVERGENT.first
+    DIVERGENT.first
diff --git a/benchmark/vm_ivar_set_on_instance.yml b/benchmark/vm_ivar_set_on_instance.yml
new file mode 100644
index 0000000000..6ce53a86ec
--- /dev/null
+++ b/benchmark/vm_ivar_set_on_instance.yml
@@ -0,0 +1,94 @@
+prelude: |
+  class TheClass
+    def initialize
+      @levar = 1
+      @v0 = 1
+      @v1 = 2
+      @v3 = 3
+    end
+
+    def set_value_loop
+      # 100k
+      i = 0
+      while i < 100_000
+        # 10 times to de-emphasize loop overhead
+        @levar = i
+        @levar = i
+        @levar = i
+        @levar = i
+        @levar = i
+        @levar = i
+        @levar = i
+        @levar = i
+        @levar = i
+        @levar = i
+        i += 1
+      end
+    end
+  end
+
+  class Generic < Time
+    def initialize
+      @levar = 1
+      @v0 = 1
+      @v1 = 2
+      @v3 = 3
+    end
+
+    def set_value_loop
+      # 100k
+      i = 0
+      while i < 100_000
+        # 10 times to de-emphasize loop overhead
+        @levar = i
+        @levar = i
+        @levar = i
+        @levar = i
+        @levar = i
+        @levar = i
+        @levar = i
+        @levar = i
+        @levar = i
+        @levar = i
+        i += 1
+      end
+    end
+  end
+
+  obj = TheClass.new
+  gen_obj = Generic.new
+
+  class SomeClass
+    @levar = 1
+    @v0 = 1
+    @v1 = 2
+    @v3 = 3
+
+    def self.set_value_loop
+      # 100k
+      i = 0
+      while i < 100_000
+        # 10 times to de-emphasize loop overhead
+        @levar = i
+        @levar = i
+        @levar = i
+        @levar = i
+        @levar = i
+        @levar = i
+        @levar = i
+        @levar = i
+        @levar = i
+        @levar = i
+        i += 1
+      end
+    end
+  end
+
+benchmark:
+  vm_ivar_set_on_instance: |
+    obj.set_value_loop
+  vm_ivar_set_on_generic: |
+    gen_obj.set_value_loop
+  vm_ivar_set_on_class: |
+    SomeClass.set_value_loop
+loop_count: 100
diff --git a/benchmark/vm_ivar_set_subclass.yml b/benchmark/vm_ivar_set_subclass.yml
index 2653d36ded..bc8bf5bf6b 100644
--- a/benchmark/vm_ivar_set_subclass.yml
+++ b/benchmark/vm_ivar_set_subclass.yml
@@ -1,6 +1,6 @@
 prelude: |
   class A
-    def initialize
+    def set_ivars
       @a = nil
       @b = nil
       @c = nil
@@ -10,8 +10,11 @@ prelude: |
   end
   class B < A; end
   class C < A; end
+
+  b = B.new
+  c = C.new
 benchmark:
   vm_ivar_init_subclass: |
-    B.new
-    C.new
+    b.set_ivars
+    c.set_ivars
 loop_count: 3000000
diff --git a/benchmark/vm_lvar_cond_set.yml b/benchmark/vm_lvar_cond_set.yml
new file mode 100644
index 0000000000..1845f9d12e
--- /dev/null
+++ b/benchmark/vm_lvar_cond_set.yml
@@ -0,0 +1,8 @@
+benchmark:
+  vm_lvar_cond_set: |
+    a ||= 1
+    b ||= 1
+    c ||= 1
+    d ||= 1
+    nil
+loop_count: 30000000
diff --git a/benchmark/vm_method_splat_calls.yml b/benchmark/vm_method_splat_calls.yml
new file mode 100644
index 0000000000..f2f366e99c
--- /dev/null
+++ b/benchmark/vm_method_splat_calls.yml
@@ -0,0 +1,13 @@
+prelude: |
+  def f(x=0, y: 0) end
+  a = [1]
+  ea = []
+  kw = {y: 1}
+  b = lambda{}
+benchmark:
+  arg_splat: "f(1, *ea)"
+  arg_splat_block: "f(1, *ea, &b)"
+  splat_kw_splat: "f(*a, **kw)"
+  splat_kw_splat_block: "f(*a, **kw, &b)"
+  splat_kw: "f(*a, y: 1)"
+  splat_kw_block: "f(*a, y: 1, &b)"
diff --git a/benchmark/vm_method_splat_calls2.yml b/benchmark/vm_method_splat_calls2.yml
new file mode 100644
index 0000000000..d33dcd7e8b
--- /dev/null
+++ b/benchmark/vm_method_splat_calls2.yml
@@ -0,0 +1,27 @@
+prelude: |
+  def named_arg_splat(*a) end
+  def named_arg_kw_splat(*a, **kw) end
+  def anon_arg_splat(*) end
+  def anon_kw_splat(**) end
+  def anon_arg_kw_splat(*, **) end
+  def anon_fw_to_named(*, **) named_arg_kw_splat(*, **) end
+  def fw_to_named(...) named_arg_kw_splat(...) end
+  def fw_to_anon_to_named(...) anon_fw_to_named(...) end
+  def fw_no_kw(...) named_arg_splat(...) end
+  a = [1]
+  kw = {y: 1}
+benchmark:
+  named_multi_arg_splat: "named_arg_splat(*a, *a)"
+  named_post_splat: "named_arg_splat(*a, a)"
+  anon_arg_splat: "anon_arg_splat(*a)"
+  anon_arg_kw_splat: "anon_arg_kw_splat(*a, **kw)"
+  anon_multi_arg_splat: "anon_arg_splat(*a, *a)"
+  anon_post_splat: "anon_arg_splat(*a, a)"
+  anon_kw_splat: "anon_kw_splat(**kw)"
+  anon_fw_to_named_splat: "anon_fw_to_named(*a, **kw)"
+  anon_fw_to_named_no_splat: "anon_fw_to_named(1, y: 1)"
+  fw_to_named_splat: "fw_to_named(*a, **kw)"
+  fw_to_named_no_splat: "fw_to_named(1, y: 1)"
+  fw_to_anon_to_named_splat: "fw_to_anon_to_named(*a, **kw)"
+  fw_to_anon_to_named_no_splat: "fw_to_anon_to_named(1, y: 1)"
+  fw_no_kw: "fw_no_kw(1, 2)"
diff --git a/benchmark/vm_send_cfunc.yml b/benchmark/vm_send_cfunc.yml
index b114ac317d..6f12b65176 100644
--- a/benchmark/vm_send_cfunc.yml
+++ b/benchmark/vm_send_cfunc.yml
@@ -1,3 +1,14 @@
+prelude: |
+  ary = []
+  kw = {a: 1}
+  empty_kw = {}
+  kw_ary = [Hash.ruby2_keywords_hash(a: 1)]
+  empty_kw_ary = [Hash.ruby2_keywords_hash({})]
 benchmark:
-  vm_send_cfunc: self.class
-loop_count: 100000000
+  vm_send_cfunc: itself
+  vm_send_cfunc_splat: itself(*ary)
+  vm_send_cfunc_splat_kw_hash: equal?(*kw_ary)
+  vm_send_cfunc_splat_empty_kw_hash: itself(*empty_kw_ary)
+  vm_send_cfunc_splat_kw: equal?(*ary, **kw)
+  vm_send_cfunc_splat_empty_kw: itself(*ary, **empty_kw)
+loop_count: 20000000
diff --git a/benchmark/vm_super_splat_calls.yml b/benchmark/vm_super_splat_calls.yml
new file mode 100644
index 0000000000..795e44e4da
--- /dev/null
+++ b/benchmark/vm_super_splat_calls.yml
@@ -0,0 +1,25 @@
+prelude: |
+  @a = [1].freeze
+  @ea = [].freeze
+  @kw = {y: 1}.freeze
+  @b = lambda{}
+  extend(Module.new{def arg_splat(x=0, y: 0) end})
+  extend(Module.new{def arg_splat_block(x=0, y: 0) end})
+  extend(Module.new{def splat_kw_splat(x=0, y: 0) end})
+  extend(Module.new{def splat_kw_splat_block(x=0, y: 0) end})
+  extend(Module.new{def splat_kw(x=0, y: 0) end})
+  extend(Module.new{def splat_kw_block(x=0, y: 0) end})
+
+  extend(Module.new{def arg_splat; super(1, *@ea) end})
+  extend(Module.new{def arg_splat_block; super(1, *@ea, &@b) end})
+  extend(Module.new{def splat_kw_splat; super(*@a, **@kw) end})
+  extend(Module.new{def splat_kw_splat_block; super(*@a, **@kw, &@b) end})
+  extend(Module.new{def splat_kw; super(*@a, y: 1) end})
+  extend(Module.new{def splat_kw_block; super(*@a, y: 1, &@b) end})
+benchmark:
+  arg_splat: "arg_splat"
+  arg_splat_block: "arg_splat_block"
+  splat_kw_splat: "splat_kw_splat"
+  splat_kw_splat_block: "splat_kw_splat_block"
+  splat_kw: "splat_kw"
+  splat_kw_block: "splat_kw_block"
diff --git a/benchmark/vm_zsuper_splat_calls.yml b/benchmark/vm_zsuper_splat_calls.yml
new file mode 100644
index 0000000000..82dc22349d
--- /dev/null
+++ b/benchmark/vm_zsuper_splat_calls.yml
@@ -0,0 +1,28 @@
+prelude: |
+  a = [1].freeze
+  ea = [].freeze
+  kw = {y: 1}.freeze
+  b = lambda{}
+  extend(Module.new{def arg_splat(x=0, y: 0) end})
+  extend(Module.new{def arg_splat_block(x=0, y: 0) end})
+  extend(Module.new{def arg_splat_post(x=0, y: 0) end})
+  extend(Module.new{def splat_kw_splat(x=0, y: 0) end})
+  extend(Module.new{def splat_kw_splat_block(x=0, y: 0) end})
+  extend(Module.new{def splat_kw(x=0, y: 0) end})
+  extend(Module.new{def splat_kw_block(x=0, y: 0) end})
+
+  extend(Module.new{def arg_splat(x, *a) super end})
+  extend(Module.new{def arg_splat_block(x, *a, &b) super end})
+  extend(Module.new{def arg_splat_post(*a, x) super end})
+  extend(Module.new{def splat_kw_splat(*a, **kw) super end})
+  extend(Module.new{def splat_kw_splat_block(*a, **kw, &b) super end})
+  extend(Module.new{def splat_kw(*a, y: 1) super end})
+  extend(Module.new{def splat_kw_block(*a, y: 1, &b) super end})
+benchmark:
+  arg_splat: "arg_splat(1, *ea)"
+  arg_splat_block: "arg_splat_block(1, *ea, &b)"
+  arg_splat_post: "arg_splat_post(1, *ea, &b)"
+  splat_kw_splat: "splat_kw_splat(*a, **kw)"
+  splat_kw_splat_block: "splat_kw_splat_block(*a, **kw, &b)"
+  splat_kw: "splat_kw(*a, y: 1)"
+  splat_kw_block: "splat_kw_block(*a, y: 1, &b)"
diff --git a/bignum.c b/bignum.c
index 142059b8fd..ee2fa1ed30 100644
--- a/bignum.c
+++ b/bignum.c
@@ -23,9 +23,12 @@
 # include <ieeefp.h>
 #endif
 
+#if !defined(USE_GMP)
 #if defined(HAVE_LIBGMP) && defined(HAVE_GMP_H)
-# define USE_GMP
-# include <gmp.h>
+# define USE_GMP 1
+#else
+# define USE_GMP 0
+#endif
 #endif
 
 #include "id.h"
@@ -42,6 +45,23 @@
 #include "ruby/util.h"
 #include "ruby_assert.h"
 
+#if USE_GMP
+RBIMPL_WARNING_PUSH()
+# ifdef _MSC_VER
+RBIMPL_WARNING_IGNORED(4146) /* for mpn_neg() */
+# endif
+# include <gmp.h>
+RBIMPL_WARNING_POP()
+#endif
+
+static const bool debug_integer_pack = (
+#ifdef DEBUG_INTEGER_PACK
+    DEBUG_INTEGER_PACK+0
+#else
+    RUBY_DEBUG
+#endif
+    ) != 0;
+
 const char ruby_digitmap[] = "0123456789abcdefghijklmnopqrstuvwxyz";
 
 #ifndef SIZEOF_BDIGIT_DBL
@@ -59,7 +79,6 @@ STATIC_ASSERT(sizeof_bdigit_and_dbl, SIZEOF_BDIGIT*2 <= SIZEOF_BDIGIT_DBL);
 STATIC_ASSERT(bdigit_signedness, 0 < (BDIGIT)-1);
 STATIC_ASSERT(bdigit_dbl_signedness, 0 < (BDIGIT_DBL)-1);
 STATIC_ASSERT(bdigit_dbl_signed_signedness, 0 > (BDIGIT_DBL_SIGNED)-1);
-STATIC_ASSERT(rbignum_embed_len_max, BIGNUM_EMBED_LEN_MAX <= (BIGNUM_EMBED_LEN_MASK >> BIGNUM_EMBED_LEN_SHIFT));
 
 #if SIZEOF_BDIGIT < SIZEOF_LONG
 STATIC_ASSERT(sizeof_long_and_sizeof_bdigit, SIZEOF_LONG % SIZEOF_BDIGIT == 0);
@@ -99,8 +118,8 @@ STATIC_ASSERT(sizeof_long_and_sizeof_bdigit, SIZEOF_BDIGIT % SIZEOF_LONG == 0);
 #endif
 
 #define BIGZEROP(x) (BIGNUM_LEN(x) == 0 || \
-		     (BDIGITS(x)[0] == 0 && \
-		      (BIGNUM_LEN(x) == 1 || bigzero_p(x))))
+                     (BDIGITS(x)[0] == 0 && \
+                      (BIGNUM_LEN(x) == 1 || bigzero_p(x))))
 #define BIGSIZE(x) (BIGNUM_LEN(x) == 0 ? (size_t)0 : \
     BDIGITS(x)[BIGNUM_LEN(x)-1] ? \
         (size_t)(BIGNUM_LEN(x)*SIZEOF_BDIGIT - nlz(BDIGITS(x)[BIGNUM_LEN(x)-1])/CHAR_BIT) : \
@@ -145,7 +164,7 @@ STATIC_ASSERT(sizeof_long_and_sizeof_bdigit, SIZEOF_BDIGIT % SIZEOF_LONG == 0);
 #define GMP_DIV_DIGITS 20
 #define GMP_BIG2STR_DIGITS 20
 #define GMP_STR2BIG_DIGITS 20
-#ifdef USE_GMP
+#if USE_GMP
 # define NAIVE_MUL_DIGITS GMP_MUL_DIGITS
 #else
 # define NAIVE_MUL_DIGITS KARATSUBA_MUL_DIGITS
@@ -335,7 +354,7 @@ maxpow_in_bdigit_dbl(int base, int *exp_ret)
     BDIGIT_DBL maxpow;
     int exponent;
 
-    assert(2 <= base && base <= 36);
+    RUBY_ASSERT(2 <= base && base <= 36);
 
     {
 #if SIZEOF_BDIGIT_DBL == 2
@@ -367,7 +386,7 @@ maxpow_in_bdigit_dbl(int base, int *exp_ret)
 static inline BDIGIT_DBL
 bary2bdigitdbl(const BDIGIT *ds, size_t n)
 {
-    assert(n <= 2);
+    RUBY_ASSERT(n <= 2);
 
     if (n == 2)
         return ds[0] | BIGUP(ds[1]);
@@ -379,7 +398,7 @@ bary2bdigitdbl(const BDIGIT *ds, size_t n)
 static inline void
 bdigitdbl2bary(BDIGIT *ds, size_t n, BDIGIT_DBL num)
 {
-    assert(n == 2);
+    RUBY_ASSERT(n == 2);
 
     ds[0] = BIGLO(num);
     ds[1] = (BDIGIT)BIGDN(num);
@@ -410,12 +429,12 @@ bary_small_lshift(BDIGIT *zds, const BDIGIT *xds, size_t n, int shift)
 {
     size_t i;
     BDIGIT_DBL num = 0;
-    assert(0 <= shift && shift < BITSPERDIG);
+    RUBY_ASSERT(0 <= shift && shift < BITSPERDIG);
 
     for (i=0; i<n; i++) {
-	num = num | (BDIGIT_DBL)*xds++ << shift;
-	*zds++ = BIGLO(num);
-	num = BIGDN(num);
+        num = num | (BDIGIT_DBL)*xds++ << shift;
+        *zds++ = BIGLO(num);
+        num = BIGDN(num);
     }
     return BIGLO(num);
 }
@@ -426,14 +445,14 @@ bary_small_rshift(BDIGIT *zds, const BDIGIT *xds, size_t n, int shift, BDIGIT hi
     size_t i;
     BDIGIT_DBL num = 0;
 
-    assert(0 <= shift && shift < BITSPERDIG);
+    RUBY_ASSERT(0 <= shift && shift < BITSPERDIG);
 
     num = BIGUP(higher_bdigit);
     for (i = 0; i < n; i++) {
         BDIGIT x = xds[n - i - 1];
-	num = (num | x) >> shift;
+        num = (num | x) >> shift;
         zds[n - i - 1] = BIGLO(num);
-	num = BIGUP(x);
+        num = BIGUP(x);
     }
 }
 
@@ -443,7 +462,7 @@ bary_zero_p(const BDIGIT *xds, size_t xn)
     if (xn == 0)
         return 1;
     do {
-	if (xds[--xn]) return 0;
+        if (xds[--xn]) return 0;
     } while (xn);
     return 1;
 }
@@ -971,7 +990,7 @@ integer_unpack_num_bdigits_small(size_t numwords, size_t wordsize, size_t nails,
 {
     /* nlp_bits stands for number of leading padding bits */
     size_t num_bits = (wordsize * CHAR_BIT - nails) * numwords;
-    size_t num_bdigits = (num_bits + BITSPERDIG - 1) / BITSPERDIG;
+    size_t num_bdigits = roomof(num_bits, BITSPERDIG);
     *nlp_bits_ret = (int)(num_bdigits * BITSPERDIG - num_bits);
     return num_bdigits;
 }
@@ -981,7 +1000,7 @@ integer_unpack_num_bdigits_generic(size_t numwords, size_t wordsize, size_t nail
 {
     /* BITSPERDIG = SIZEOF_BDIGIT * CHAR_BIT */
     /* num_bits = (wordsize * CHAR_BIT - nails) * numwords */
-    /* num_bdigits = (num_bits + BITSPERDIG - 1) / BITSPERDIG */
+    /* num_bdigits = roomof(num_bits, BITSPERDIG) */
 
     /* num_bits = CHAR_BIT * (wordsize * numwords) - nails * numwords = CHAR_BIT * num_bytes1 - nails * numwords */
     size_t num_bytes1 = wordsize * numwords;
@@ -1043,15 +1062,13 @@ integer_unpack_num_bdigits(size_t numwords, size_t wordsize, size_t nails, int *
 
     if (numwords <= (SIZE_MAX - (BITSPERDIG-1)) / CHAR_BIT / wordsize) {
         num_bdigits = integer_unpack_num_bdigits_small(numwords, wordsize, nails, nlp_bits_ret);
-#ifdef DEBUG_INTEGER_PACK
-        {
+        if (debug_integer_pack) {
             int nlp_bits1;
             size_t num_bdigits1 = integer_unpack_num_bdigits_generic(numwords, wordsize, nails, &nlp_bits1);
-            assert(num_bdigits == num_bdigits1);
-            assert(*nlp_bits_ret == nlp_bits1);
+            RUBY_ASSERT(num_bdigits == num_bdigits1);
+            RUBY_ASSERT(*nlp_bits_ret == nlp_bits1);
             (void)num_bdigits1;
         }
-#endif
     }
     else {
         num_bdigits = integer_unpack_num_bdigits_generic(numwords, wordsize, nails, nlp_bits_ret);
@@ -1259,7 +1276,7 @@ bary_unpack_internal(BDIGIT *bdigits, size_t num_bdigits, const void *words, siz
         }
         if (dd)
             *dp++ = (BDIGIT)dd;
-        assert(dp <= de);
+        RUBY_ASSERT(dp <= de);
         while (dp < de)
             *dp++ = 0;
 #undef PUSH_BITS
@@ -1318,7 +1335,7 @@ bary_unpack(BDIGIT *bdigits, size_t num_bdigits, const void *words, size_t numwo
 
     num_bdigits0 = integer_unpack_num_bdigits(numwords, wordsize, nails, &nlp_bits);
 
-    assert(num_bdigits0 <= num_bdigits);
+    RUBY_ASSERT(num_bdigits0 <= num_bdigits);
 
     sign = bary_unpack_internal(bdigits, num_bdigits0, words, numwords, wordsize, nails, flags, nlp_bits);
 
@@ -1337,16 +1354,16 @@ bary_subb(BDIGIT *zds, size_t zn, const BDIGIT *xds, size_t xn, const BDIGIT *yd
     size_t i;
     size_t sn;
 
-    assert(xn <= zn);
-    assert(yn <= zn);
+    RUBY_ASSERT(xn <= zn);
+    RUBY_ASSERT(yn <= zn);
 
     sn = xn < yn ? xn : yn;
 
     num = borrow ? -1 : 0;
     for (i = 0; i < sn; i++) {
-	num += (BDIGIT_DBL_SIGNED)xds[i] - yds[i];
-	zds[i] = BIGLO(num);
-	num = BIGDN(num);
+        num += (BDIGIT_DBL_SIGNED)xds[i] - yds[i];
+        zds[i] = BIGLO(num);
+        num = BIGDN(num);
     }
     if (yn <= xn) {
         for (; i < xn; i++) {
@@ -1365,7 +1382,7 @@ bary_subb(BDIGIT *zds, size_t zn, const BDIGIT *xds, size_t xn, const BDIGIT *yd
     }
     if (num == 0) goto num_is_zero;
     for (; i < zn; i++) {
-	zds[i] = BDIGMAX;
+        zds[i] = BDIGMAX;
     }
     return 1;
 
@@ -1373,10 +1390,10 @@ bary_subb(BDIGIT *zds, size_t zn, const BDIGIT *xds, size_t xn, const BDIGIT *yd
     if (xds == zds && xn == zn)
         return 0;
     for (; i < xn; i++) {
-	zds[i] = xds[i];
+        zds[i] = xds[i];
     }
     for (; i < zn; i++) {
-	zds[i] = 0;
+        zds[i] = 0;
     }
     return 0;
 }
@@ -1399,31 +1416,31 @@ bary_addc(BDIGIT *zds, size_t zn, const BDIGIT *xds, size_t xn, const BDIGIT *yd
     BDIGIT_DBL num;
     size_t i;
 
-    assert(xn <= zn);
-    assert(yn <= zn);
+    RUBY_ASSERT(xn <= zn);
+    RUBY_ASSERT(yn <= zn);
 
     if (xn > yn) {
-	const BDIGIT *tds;
-	tds = xds; xds = yds; yds = tds;
-	i = xn; xn = yn; yn = i;
+        const BDIGIT *tds;
+        tds = xds; xds = yds; yds = tds;
+        i = xn; xn = yn; yn = i;
     }
 
     num = carry ? 1 : 0;
     for (i = 0; i < xn; i++) {
-	num += (BDIGIT_DBL)xds[i] + yds[i];
-	zds[i] = BIGLO(num);
-	num = BIGDN(num);
+        num += (BDIGIT_DBL)xds[i] + yds[i];
+        zds[i] = BIGLO(num);
+        num = BIGDN(num);
     }
     for (; i < yn; i++) {
         if (num == 0) goto num_is_zero;
-	num += yds[i];
-	zds[i] = BIGLO(num);
-	num = BIGDN(num);
+        num += yds[i];
+        zds[i] = BIGLO(num);
+        num = BIGDN(num);
     }
     for (; i < zn; i++) {
         if (num == 0) goto num_is_zero;
-	zds[i] = BIGLO(num);
-	num = BIGDN(num);
+        zds[i] = BIGLO(num);
+        num = BIGDN(num);
     }
     return num != 0;
 
@@ -1431,10 +1448,10 @@ bary_addc(BDIGIT *zds, size_t zn, const BDIGIT *xds, size_t xn, const BDIGIT *yd
     if (yds == zds && yn == zn)
         return 0;
     for (; i < yn; i++) {
-	zds[i] = yds[i];
+        zds[i] = yds[i];
     }
     for (; i < zn; i++) {
-	zds[i] = 0;
+        zds[i] = 0;
     }
     return 0;
 }
@@ -1464,7 +1481,7 @@ bary_mul_single(BDIGIT *zds, size_t zn, BDIGIT x, BDIGIT y)
 {
     BDIGIT_DBL n;
 
-    assert(2 <= zn);
+    RUBY_ASSERT(2 <= zn);
 
     n = (BDIGIT_DBL)x * y;
     bdigitdbl2bary(zds, 2, n);
@@ -1478,7 +1495,7 @@ bary_muladd_1xN(BDIGIT *zds, size_t zn, BDIGIT x, const BDIGIT *yds, size_t yn)
     BDIGIT_DBL dd;
     size_t j;
 
-    assert(zn > yn);
+    RUBY_ASSERT(zn > yn);
 
     if (x == 0)
         return 0;
@@ -1513,7 +1530,7 @@ bigdivrem_mulsub(BDIGIT *zds, size_t zn, BDIGIT x, const BDIGIT *yds, size_t yn)
     BDIGIT_DBL t2;
     BDIGIT_DBL_SIGNED num;
 
-    assert(zn == yn + 1);
+    RUBY_ASSERT(zn == yn + 1);
 
     num = 0;
     t2 = 0;
@@ -1538,7 +1555,7 @@ bary_mulsub_1xN(BDIGIT *zds, size_t zn, BDIGIT x, const BDIGIT *yds, size_t yn)
 {
     BDIGIT_DBL_SIGNED num;
 
-    assert(zn == yn + 1);
+    RUBY_ASSERT(zn == yn + 1);
 
     num = bigdivrem_mulsub(zds, zn, x, yds, yn);
     zds[yn] = BIGLO(num);
@@ -1552,7 +1569,7 @@ bary_mul_normal(BDIGIT *zds, size_t zn, const BDIGIT *xds, size_t xn, const BDIG
 {
     size_t i;
 
-    assert(xn + yn <= zn);
+    RUBY_ASSERT(xn + yn <= zn);
 
     BDIGITS_ZERO(zds, zn);
     for (i = 0; i < xn; i++) {
@@ -1583,7 +1600,7 @@ bary_sq_fast(BDIGIT *zds, size_t zn, const BDIGIT *xds, size_t xn)
     BDIGIT vl;
     int vh;
 
-    assert(xn * 2 <= zn);
+    RUBY_ASSERT(xn * 2 <= zn);
 
     BDIGITS_ZERO(zds, zn);
 
@@ -1591,30 +1608,30 @@ bary_sq_fast(BDIGIT *zds, size_t zn, const BDIGIT *xds, size_t xn)
         return;
 
     for (i = 0; i < xn-1; i++) {
-	v = (BDIGIT_DBL)xds[i];
-	if (!v)
+        v = (BDIGIT_DBL)xds[i];
+        if (!v)
             continue;
-	c = (BDIGIT_DBL)zds[i + i] + v * v;
-	zds[i + i] = BIGLO(c);
-	c = BIGDN(c);
-	v *= 2;
+        c = (BDIGIT_DBL)zds[i + i] + v * v;
+        zds[i + i] = BIGLO(c);
+        c = BIGDN(c);
+        v *= 2;
         vl = BIGLO(v);
         vh = (int)BIGDN(v);
-	for (j = i + 1; j < xn; j++) {
-	    w = (BDIGIT_DBL)xds[j];
-	    c += (BDIGIT_DBL)zds[i + j] + vl * w;
-	    zds[i + j] = BIGLO(c);
-	    c = BIGDN(c);
-	    if (vh)
+        for (j = i + 1; j < xn; j++) {
+            w = (BDIGIT_DBL)xds[j];
+            c += (BDIGIT_DBL)zds[i + j] + vl * w;
+            zds[i + j] = BIGLO(c);
+            c = BIGDN(c);
+            if (vh)
                 c += w;
-	}
-	if (c) {
-	    c += (BDIGIT_DBL)zds[i + xn];
-	    zds[i + xn] = BIGLO(c);
-	    c = BIGDN(c);
+        }
+        if (c) {
+            c += (BDIGIT_DBL)zds[i + xn];
+            zds[i + xn] = BIGLO(c);
+            c = BIGDN(c);
             if (c)
                 zds[i + xn + 1] += (BDIGIT)c;
-	}
+        }
     }
 
     /* i == xn-1 */
@@ -1639,6 +1656,12 @@ rb_big_sq_fast(VALUE x)
     return z;
 }
 
+static inline size_t
+max_size(size_t a, size_t b)
+{
+    return (a > b ? a : b);
+}
+
 /* balancing multiplication by slicing larger argument */
 static void
 bary_mul_balance_with_mulfunc(BDIGIT *const zds, const size_t zn,
@@ -1649,15 +1672,21 @@ bary_mul_balance_with_mulfunc(BDIGIT *const zds, const size_t zn,
     VALUE work = 0;
     size_t n;
 
-    assert(xn + yn <= zn);
-    assert(xn <= yn);
-    assert(!KARATSUBA_BALANCED(xn, yn) || !TOOM3_BALANCED(xn, yn));
+    RUBY_ASSERT(xn + yn <= zn);
+    RUBY_ASSERT(xn <= yn);
+    RUBY_ASSERT(!KARATSUBA_BALANCED(xn, yn) || !TOOM3_BALANCED(xn, yn));
 
     BDIGITS_ZERO(zds, xn);
 
     if (wn < xn) {
-        const size_t r = (yn % xn) ? (yn % xn) : xn;
-        if ((2 * xn + yn + r) > zn) {
+        /* The condition when a new buffer is needed:
+         * 1. (2(xn+r) > zn-(yn-r)) => (2xn+r > zn-yn), at the last
+         *    iteration (or r == 0)
+         * 2. (2(xn+xn) > zn-(yn-r-xn)) => (3xn-r > zn-yn), at the
+         *    previous iteration.
+         */
+        const size_t r = yn % xn;
+        if (2*xn + yn + max_size(xn-r, r) > zn) {
             wn = xn;
             wds = ALLOCV_N(BDIGIT, work, wn);
         }
@@ -1692,7 +1721,7 @@ bary_mul_balance_with_mulfunc(BDIGIT *const zds, const size_t zn,
                      zds + n, tn,
                      wds, xn);
         }
-	n += r;
+        n += r;
     }
     BDIGITS_ZERO(zds+xn+yn, zn - (xn+yn));
 
@@ -1727,9 +1756,9 @@ bary_mul_karatsuba(BDIGIT *zds, size_t zn, const BDIGIT *xds, size_t xn, const B
     const BDIGIT *xds0, *xds1, *yds0, *yds1;
     BDIGIT *zds0, *zds1, *zds2, *zds3;
 
-    assert(xn + yn <= zn);
-    assert(xn <= yn);
-    assert(yn < 2 * xn);
+    RUBY_ASSERT(xn + yn <= zn);
+    RUBY_ASSERT(xn <= yn);
+    RUBY_ASSERT(yn < 2 * xn);
 
     sq = xds == yds && xn == yn;
 
@@ -1744,7 +1773,7 @@ bary_mul_karatsuba(BDIGIT *zds, size_t zn, const BDIGIT *xds, size_t xn, const B
 
     n = yn / 2;
 
-    assert(n < xn);
+    RUBY_ASSERT(n < xn);
 
     if (wn < n) {
         /* This function itself needs only n BDIGITs for work area.
@@ -1865,7 +1894,7 @@ bary_mul_karatsuba(BDIGIT *zds, size_t zn, const BDIGIT *xds, size_t xn, const B
         for (x = 0, i = xn-1; 0 <= i; i--) { x <<= SIZEOF_BDIGIT*CHAR_BIT; x |= xds[i]; }
         for (y = 0, i = yn-1; 0 <= i; i--) { y <<= SIZEOF_BDIGIT*CHAR_BIT; y |= yds[i]; }
         for (z = 0, i = zn-1; 0 <= i; i--) { z <<= SIZEOF_BDIGIT*CHAR_BIT; z |= zds[i]; }
-        assert(z == x * y);
+        RUBY_ASSERT(z == x * y);
     }
     */
 
@@ -1933,11 +1962,11 @@ bary_mul_toom3(BDIGIT *zds, size_t zn, const BDIGIT *xds, size_t xn, const BDIGI
 
     int sq = xds == yds && xn == yn;
 
-    assert(xn <= yn);  /* assume y >= x */
-    assert(xn + yn <= zn);
+    RUBY_ASSERT(xn <= yn);  /* assume y >= x */
+    RUBY_ASSERT(xn + yn <= zn);
 
     n = (yn + 2) / 3;
-    assert(2*n < xn);
+    RUBY_ASSERT(2*n < xn);
 
     wnc = 0;
 
@@ -2084,21 +2113,21 @@ bary_mul_toom3(BDIGIT *zds, size_t zn, const BDIGIT *xds, size_t xn, const BDIGI
         v3n = u3n; v3ds = u3ds; v3p = u3p;
     }
     else {
-	/* v1 <- y0 + y2 */
+        /* v1 <- y0 + y2 */
         bary_add(v1ds, v1n, y0ds, y0n, y2ds, y2n);
         v1p = 1;
 
-	/* y(-1) : v2 <- v1 - y1 = y0 - y1 + y2 */
+        /* y(-1) : v2 <- v1 - y1 = y0 - y1 + y2 */
         v2p = 1;
         if (bary_sub(v2ds, v2n, v1ds, v1n, y1ds, y1n)) {
             bary_2comp(v2ds, v2n);
             v2p = 0;
         }
 
-	/* y(1) : v1 <- v1 + y1 = y0 + y1 + y2 */
+        /* y(1) : v1 <- v1 + y1 = y0 + y1 + y2 */
         bary_add(v1ds, v1n, v1ds, v1n, y1ds, y1n);
 
-	/* y(-2) : v3 <- 2 * (v2 + y2) - y0 = y0 - 2 * (y1 - 2 * y2) */
+        /* y(-2) : v3 <- 2 * (v2 + y2) - y0 = y0 - 2 * (y1 - 2 * y2) */
         v3p = 1;
         if (v2p) {
             bary_add(v3ds, v3n, v2ds, v2n, y2ds, y2n);
@@ -2124,19 +2153,19 @@ bary_mul_toom3(BDIGIT *zds, size_t zn, const BDIGIT *xds, size_t xn, const BDIGI
     /* z(1) : t1 <- u1 * v1 */
     bary_mul_toom3_start(t1ds, t1n, u1ds, u1n, v1ds, v1n, wds, wn);
     t1p = u1p == v1p;
-    assert(t1ds[t1n-1] == 0);
+    RUBY_ASSERT(t1ds[t1n-1] == 0);
     t1n--;
 
     /* z(-1) : t2 <- u2 * v2 */
     bary_mul_toom3_start(t2ds, t2n, u2ds, u2n, v2ds, v2n, wds, wn);
     t2p = u2p == v2p;
-    assert(t2ds[t2n-1] == 0);
+    RUBY_ASSERT(t2ds[t2n-1] == 0);
     t2n--;
 
     /* z(-2) : t3 <- u3 * v3 */
     bary_mul_toom3_start(t3ds, t3n, u3ds, u3n, v3ds, v3n, wds, wn);
     t3p = u3p == v3p;
-    assert(t3ds[t3n-1] == 0);
+    RUBY_ASSERT(t3ds[t3n-1] == 0);
     t3n--;
 
     /* z(inf) : t4 <- x2 * y2 */
@@ -2291,7 +2320,7 @@ rb_big_mul_toom3(VALUE x, VALUE y)
     return z;
 }
 
-#ifdef USE_GMP
+#if USE_GMP
 static inline void
 bdigits_to_mpz(mpz_t mp, const BDIGIT *digits, size_t len)
 {
@@ -2312,7 +2341,7 @@ bary_mul_gmp(BDIGIT *zds, size_t zn, const BDIGIT *xds, size_t xn, const BDIGIT
     mpz_t x, y, z;
     size_t count;
 
-    assert(xn + yn <= zn);
+    RUBY_ASSERT(xn + yn <= zn);
 
     mpz_init(x);
     mpz_init(y);
@@ -2347,7 +2376,7 @@ rb_big_mul_gmp(VALUE x, VALUE y)
 static void
 bary_short_mul(BDIGIT *zds, size_t zn, const BDIGIT *xds, size_t xn, const BDIGIT *yds, size_t yn)
 {
-    assert(xn + yn <= zn);
+    RUBY_ASSERT(xn + yn <= zn);
 
     if (xn == 1 && yn == 1) {
         bary_mul_single(zds, zn, xds[0], yds[0]);
@@ -2383,7 +2412,7 @@ bary_mul_precheck(BDIGIT **zdsp, size_t *znp, const BDIGIT **xdsp, size_t *xnp,
     const BDIGIT *yds = *ydsp;
     size_t yn = *ynp;
 
-    assert(xn + yn <= zn);
+    RUBY_ASSERT(xn + yn <= zn);
 
     nlsz = 0;
 
@@ -2429,10 +2458,10 @@ bary_mul_precheck(BDIGIT **zdsp, size_t *znp, const BDIGIT **xdsp, size_t *xnp,
     if (xn > yn) {
         const BDIGIT *tds;
         size_t tn;
-	tds = xds; xds = yds; yds = tds;
-	tn = xn; xn = yn; yn = tn;
+        tds = xds; xds = yds; yds = tds;
+        tn = xn; xn = yn; yn = tn;
     }
-    assert(xn <= yn);
+    RUBY_ASSERT(xn <= yn);
 
     if (xn <= 1) {
         if (xn == 0) {
@@ -2556,7 +2585,7 @@ bary_mul(BDIGIT *zds, size_t zn, const BDIGIT *xds, size_t xn, const BDIGIT *yds
         }
     }
 
-#ifdef USE_GMP
+#if USE_GMP
     bary_mul_gmp(zds, zn, xds, xn, yds, yn);
 #else
     bary_mul_toom3_start(zds, zn, xds, xn, yds, yn, NULL, 0);
@@ -2580,26 +2609,26 @@ bigdivrem1(void *ptr)
     BDIGIT q;
 
     do {
-	if (bds->stop) {
-	    bds->zn = zn;
-	    return 0;
+        if (bds->stop) {
+            bds->zn = zn;
+            return 0;
         }
-	if (zds[zn-1] == yds[yn-1]) q = BDIGMAX;
-	else q = (BDIGIT)((BIGUP(zds[zn-1]) + zds[zn-2])/yds[yn-1]);
-	if (q) {
+        if (zds[zn-1] == yds[yn-1]) q = BDIGMAX;
+        else q = (BDIGIT)((BIGUP(zds[zn-1]) + zds[zn-2])/yds[yn-1]);
+        if (q) {
             num = bigdivrem_mulsub(zds+zn-(yn+1), yn+1,
                                    q,
                                    yds, yn);
-	    while (num) { /* "add back" required */
-		q--;
+            while (num) { /* "add back" required */
+                q--;
                 num = bary_add(zds+zn-(yn+1), yn,
                                zds+zn-(yn+1), yn,
                                yds, yn);
                 num--;
-	    }
-	}
+            }
+        }
         zn--;
-	zds[zn] = q;
+        zds[zn] = q;
     } while (zn > yn);
     return 0;
 }
@@ -2615,8 +2644,8 @@ rb_big_stop(void *ptr)
 static BDIGIT
 bigdivrem_single1(BDIGIT *qds, const BDIGIT *xds, size_t xn, BDIGIT x_higher_bdigit, BDIGIT y)
 {
-    assert(0 < xn);
-    assert(x_higher_bdigit < y);
+    RUBY_ASSERT(0 < xn);
+    RUBY_ASSERT(x_higher_bdigit < y);
     if (POW2_P(y)) {
         BDIGIT r;
         r = xds[0] & (y-1);
@@ -2648,9 +2677,9 @@ bigdivrem_restoring(BDIGIT *zds, size_t zn, BDIGIT *yds, size_t yn)
     struct big_div_struct bds;
     size_t ynzero;
 
-    assert(yn < zn);
-    assert(BDIGIT_MSB(yds[yn-1]));
-    assert(zds[zn-1] < yds[yn-1]);
+    RUBY_ASSERT(yn < zn);
+    RUBY_ASSERT(BDIGIT_MSB(yds[yn-1]));
+    RUBY_ASSERT(zds[zn-1] < yds[yn-1]);
 
     for (ynzero = 0; !yds[ynzero]; ynzero++);
 
@@ -2668,16 +2697,16 @@ bigdivrem_restoring(BDIGIT *zds, size_t zn, BDIGIT *yds, size_t yn)
     bds.zn = zn - ynzero;
     if (bds.zn > 10000 || bds.yn > 10000) {
       retry:
-	bds.stop = Qfalse;
-        rb_nogvl(bigdivrem1, &bds, rb_big_stop, &bds, RB_NOGVL_UBF_ASYNC_SAFE);
+        bds.stop = Qfalse;
+        rb_nogvl(bigdivrem1, &bds, rb_big_stop, &bds, RB_NOGVL_UBF_ASYNC_SAFE | RB_NOGVL_OFFLOAD_SAFE);
 
-	if (bds.stop == Qtrue) {
-	    /* execute trap handler, but exception was not raised. */
-	    goto retry;
-	}
+        if (bds.stop == Qtrue) {
+            /* execute trap handler, but exception was not raised. */
+            goto retry;
+        }
     }
     else {
-	bigdivrem1(&bds);
+        bigdivrem1(&bds);
     }
 }
 
@@ -2689,9 +2718,9 @@ bary_divmod_normal(BDIGIT *qds, size_t qn, BDIGIT *rds, size_t rn, const BDIGIT
     size_t zn;
     VALUE tmpyz = 0;
 
-    assert(yn < xn || (xn == yn && yds[yn - 1] <= xds[xn - 1]));
-    assert(qds ? (xn - yn + 1) <= qn : 1);
-    assert(rds ? yn <= rn : 1);
+    RUBY_ASSERT(yn < xn || (xn == yn && yds[yn - 1] <= xds[xn - 1]));
+    RUBY_ASSERT(qds ? (xn - yn + 1) <= qn : 1);
+    RUBY_ASSERT(rds ? yn <= rn : 1);
 
     zn = xn + BIGDIVREM_EXTRA_WORDS;
 
@@ -2776,17 +2805,17 @@ rb_big_divrem_normal(VALUE x, VALUE y)
     return rb_assoc_new(q, r);
 }
 
-#ifdef USE_GMP
+#if USE_GMP
 static void
 bary_divmod_gmp(BDIGIT *qds, size_t qn, BDIGIT *rds, size_t rn, const BDIGIT *xds, size_t xn, const BDIGIT *yds, size_t yn)
 {
     mpz_t x, y, q, r;
     size_t count;
 
-    assert(yn < xn || (xn == yn && yds[yn - 1] <= xds[xn - 1]));
-    assert(qds ? (xn - yn + 1) <= qn : 1);
-    assert(rds ? yn <= rn : 1);
-    assert(qds || rds);
+    RUBY_ASSERT(yn < xn || (xn == yn && yds[yn - 1] <= xds[xn - 1]));
+    RUBY_ASSERT(qds ? (xn - yn + 1) <= qn : 1);
+    RUBY_ASSERT(rds ? yn <= rn : 1);
+    RUBY_ASSERT(qds || rds);
 
     mpz_init(x);
     mpz_init(y);
@@ -2860,7 +2889,7 @@ rb_big_divrem_gmp(VALUE x, VALUE y)
 static void
 bary_divmod_branch(BDIGIT *qds, size_t qn, BDIGIT *rds, size_t rn, const BDIGIT *xds, size_t xn, const BDIGIT *yds, size_t yn)
 {
-#ifdef USE_GMP
+#if USE_GMP
     if (GMP_DIV_DIGITS < xn) {
         bary_divmod_gmp(qds, qn, rds, rn, xds, xn, yds, yn);
         return;
@@ -2872,8 +2901,8 @@ bary_divmod_branch(BDIGIT *qds, size_t qn, BDIGIT *rds, size_t rn, const BDIGIT
 static void
 bary_divmod(BDIGIT *qds, size_t qn, BDIGIT *rds, size_t rn, const BDIGIT *xds, size_t xn, const BDIGIT *yds, size_t yn)
 {
-    assert(xn <= qn);
-    assert(yn <= rn);
+    RUBY_ASSERT(xn <= qn);
+    RUBY_ASSERT(yn <= rn);
 
     BARY_TRUNC(yds, yn);
     if (yn == 0)
@@ -2935,7 +2964,7 @@ int
 rb_cmpint(VALUE val, VALUE a, VALUE b)
 {
     if (NIL_P(val)) {
-	rb_cmperr(a, b);
+        rb_cmperr(a, b);
     }
     if (FIXNUM_P(val)) {
         long l = FIX2LONG(val);
@@ -2944,9 +2973,9 @@ rb_cmpint(VALUE val, VALUE a, VALUE b)
         return 0;
     }
     if (RB_BIGNUM_TYPE_P(val)) {
-	if (BIGZEROP(val)) return 0;
-	if (BIGNUM_SIGN(val)) return 1;
-	return -1;
+        if (BIGZEROP(val)) return 0;
+        if (BIGNUM_SIGN(val)) return 1;
+        return -1;
     }
     if (RTEST(rb_funcall(val, '>', 1, INT2FIX(0)))) return 1;
     if (RTEST(rb_funcall(val, '<', 1, INT2FIX(0)))) return -1;
@@ -2956,42 +2985,73 @@ rb_cmpint(VALUE val, VALUE a, VALUE b)
 #define BIGNUM_SET_LEN(b,l) \
     (BIGNUM_EMBED_P(b) ? \
      (void)(RBASIC(b)->flags = \
-	    (RBASIC(b)->flags & ~BIGNUM_EMBED_LEN_MASK) | \
-	    ((l) << BIGNUM_EMBED_LEN_SHIFT)) : \
+            (RBASIC(b)->flags & ~BIGNUM_EMBED_LEN_MASK) | \
+            ((l) << BIGNUM_EMBED_LEN_SHIFT)) : \
      (void)(RBIGNUM(b)->as.heap.len = (l)))
 
+static size_t
+big_embed_capa(VALUE big)
+{
+    size_t size = rb_gc_obj_slot_size(big) - offsetof(struct RBignum, as.ary);
+    RUBY_ASSERT(size % sizeof(BDIGIT) == 0);
+    size_t capa = size / sizeof(BDIGIT);
+    RUBY_ASSERT(capa <= BIGNUM_EMBED_LEN_MAX);
+    return capa;
+}
+
+static size_t
+big_embed_size(size_t capa)
+{
+    size_t size = offsetof(struct RBignum, as.ary) + (sizeof(BDIGIT) * capa);
+    if (size < sizeof(struct RBignum)) {
+        size = sizeof(struct RBignum);
+    }
+    return size;
+}
+
+static bool
+big_embeddable_p(size_t capa)
+{
+    if (capa > BIGNUM_EMBED_LEN_MAX) {
+        return false;
+    }
+    return rb_gc_size_allocatable_p(big_embed_size(capa));
+}
+
 static void
 rb_big_realloc(VALUE big, size_t len)
 {
     BDIGIT *ds;
+    size_t embed_capa = big_embed_capa(big);
+
     if (BIGNUM_EMBED_P(big)) {
-	if (BIGNUM_EMBED_LEN_MAX < len) {
-	    ds = ALLOC_N(BDIGIT, len);
-	    MEMCPY(ds, RBIGNUM(big)->as.ary, BDIGIT, BIGNUM_EMBED_LEN_MAX);
-	    RBIGNUM(big)->as.heap.len = BIGNUM_LEN(big);
-	    RBIGNUM(big)->as.heap.digits = ds;
+        if (embed_capa < len) {
+            ds = ALLOC_N(BDIGIT, len);
+            MEMCPY(ds, RBIGNUM(big)->as.ary, BDIGIT, embed_capa);
+            RBIGNUM(big)->as.heap.len = BIGNUM_LEN(big);
+            RBIGNUM(big)->as.heap.digits = ds;
             FL_UNSET_RAW(big, BIGNUM_EMBED_FLAG);
-	}
+        }
     }
     else {
-	if (len <= BIGNUM_EMBED_LEN_MAX) {
-	    ds = RBIGNUM(big)->as.heap.digits;
+        if (len <= embed_capa) {
+            ds = RBIGNUM(big)->as.heap.digits;
             FL_SET_RAW(big, BIGNUM_EMBED_FLAG);
-	    BIGNUM_SET_LEN(big, len);
-            (void)VALGRIND_MAKE_MEM_UNDEFINED((void*)RBIGNUM(big)->as.ary, sizeof(RBIGNUM(big)->as.ary));
-	    if (ds) {
-		MEMCPY(RBIGNUM(big)->as.ary, ds, BDIGIT, len);
-		xfree(ds);
-	    }
-	}
-	else {
-	    if (BIGNUM_LEN(big) == 0) {
-		RBIGNUM(big)->as.heap.digits = ALLOC_N(BDIGIT, len);
-	    }
-	    else {
-		REALLOC_N(RBIGNUM(big)->as.heap.digits, BDIGIT, len);
-	    }
-	}
+            BIGNUM_SET_LEN(big, len);
+            (void)VALGRIND_MAKE_MEM_UNDEFINED((void*)RBIGNUM(big)->as.ary, embed_capa * sizeof(BDIGIT));
+            if (ds) {
+                MEMCPY(RBIGNUM(big)->as.ary, ds, BDIGIT, len);
+                xfree(ds);
+            }
+        }
+        else {
+            if (BIGNUM_LEN(big) == 0) {
+                RBIGNUM(big)->as.heap.digits = ALLOC_N(BDIGIT, len);
+            }
+            else if (BIGNUM_LEN(big) < len) {
+                REALLOC_N(RBIGNUM(big)->as.heap.digits, BDIGIT, len);
+            }
+        }
     }
 }
 
@@ -3005,15 +3065,24 @@ rb_big_resize(VALUE big, size_t len)
 static VALUE
 bignew_1(VALUE klass, size_t len, int sign)
 {
-    NEWOBJ_OF(big, struct RBignum, klass, T_BIGNUM | (RGENGC_WB_PROTECTED_BIGNUM ? FL_WB_PROTECTED : 0));
-    VALUE bigv = (VALUE)big;
-    BIGNUM_SET_SIGN(bigv, sign);
-    if (len <= BIGNUM_EMBED_LEN_MAX) {
-        FL_SET_RAW(bigv, BIGNUM_EMBED_FLAG);
+    VALUE bigv;
+
+    if (big_embeddable_p(len)) {
+        size_t size = big_embed_size(len);
+        RUBY_ASSERT(rb_gc_size_allocatable_p(size));
+        NEWOBJ_OF(big, struct RBignum, klass,
+                T_BIGNUM | BIGNUM_EMBED_FLAG | (RGENGC_WB_PROTECTED_BIGNUM ? FL_WB_PROTECTED : 0),
+                size, 0);
+        bigv = (VALUE)big;
+        BIGNUM_SET_SIGN(bigv, sign);
         BIGNUM_SET_LEN(bigv, len);
-        (void)VALGRIND_MAKE_MEM_UNDEFINED((void*)big->as.ary, sizeof(big->as.ary));
+        (void)VALGRIND_MAKE_MEM_UNDEFINED((void*)big->as.ary, len * sizeof(BDIGIT));
     }
     else {
+        NEWOBJ_OF(big, struct RBignum, klass,
+                T_BIGNUM | (RGENGC_WB_PROTECTED_BIGNUM ? FL_WB_PROTECTED : 0), sizeof(struct RBignum), 0);
+        bigv = (VALUE)big;
+        BIGNUM_SET_SIGN(bigv, sign);
         big->as.heap.digits = ALLOC_N(BDIGIT, len);
         big->as.heap.len = len;
     }
@@ -3024,7 +3093,9 @@ bignew_1(VALUE klass, size_t len, int sign)
 VALUE
 rb_big_new(size_t len, int sign)
 {
-    return bignew(len, sign != 0);
+    VALUE obj = bignew(len, sign != 0);
+    memset(BIGNUM_DIGITS(obj), 0, len * sizeof(BDIGIT));
+    return obj;
 }
 
 VALUE
@@ -3077,7 +3148,7 @@ abs2twocomp(VALUE *xp, long *n_ret)
         MEMCPY(BDIGITS(z), ds, BDIGIT, n);
         bary_2comp(BDIGITS(z), n);
         hibits = BDIGMAX;
-	*xp = z;
+        *xp = z;
     }
     *n_ret = n;
     return hibits;
@@ -3101,7 +3172,7 @@ bigtrunc(VALUE x)
     if (len == 0) return x;
     while (--len && !ds[len]);
     if (BIGNUM_LEN(x) > len+1) {
-	rb_big_resize(x, len+1);
+        rb_big_resize(x, len+1);
     }
     return x;
 }
@@ -3154,7 +3225,7 @@ static VALUE
 bignorm(VALUE x)
 {
     if (RB_BIGNUM_TYPE_P(x)) {
-	x = bigfixize(x);
+        x = bigfixize(x);
     }
     return x;
 }
@@ -3176,8 +3247,8 @@ rb_uint2big(uintptr_t n)
     digits[0] = n;
 #else
     for (i = 0; i < bdigit_roomof(SIZEOF_VALUE); i++) {
-	digits[i] = BIGLO(n);
-	n = BIGDN(n);
+        digits[i] = BIGLO(n);
+        n = BIGDN(n);
     }
 #endif
 
@@ -3196,14 +3267,14 @@ rb_int2big(intptr_t n)
 
     if (n < 0) {
         u = 1 + (VALUE)(-(n + 1)); /* u = -n avoiding overflow */
-	neg = 1;
+        neg = 1;
     }
     else {
         u = n;
     }
     big = rb_uint2big(u);
     if (neg) {
-	BIGNUM_SET_NEGATIVE_SIGN(big);
+        BIGNUM_SET_NEGATIVE_SIGN(big);
     }
     return big;
 }
@@ -3362,7 +3433,7 @@ absint_numwords_generic(size_t numbytes, int nlz_bits_in_msbyte, size_t word_num
 
     if (sign == 2) {
 #if defined __GNUC__ && (__GNUC__ == 4 && __GNUC_MINOR__ == 4)
-	*nlz_bits_ret = 0;
+        *nlz_bits_ret = 0;
 #endif
         return (size_t)-1;
     }
@@ -3404,15 +3475,13 @@ rb_absint_numwords(VALUE val, size_t word_numbits, size_t *nlz_bits_ret)
 
     if (numbytes <= SIZE_MAX / CHAR_BIT) {
         numwords = absint_numwords_small(numbytes, nlz_bits_in_msbyte, word_numbits, &nlz_bits);
-#ifdef DEBUG_INTEGER_PACK
-        {
+        if (debug_integer_pack) {
             size_t numwords0, nlz_bits0;
             numwords0 = absint_numwords_generic(numbytes, nlz_bits_in_msbyte, word_numbits, &nlz_bits0);
-            assert(numwords0 == numwords);
-            assert(nlz_bits0 == nlz_bits);
+            RUBY_ASSERT(numwords0 == numwords);
+            RUBY_ASSERT(nlz_bits0 == nlz_bits);
             (void)numwords0;
         }
-#endif
     }
     else {
         numwords = absint_numwords_generic(numbytes, nlz_bits_in_msbyte, word_numbits, &nlz_bits);
@@ -3682,7 +3751,7 @@ rb_integer_unpack(const void *words, size_t numwords, size_t wordsize, size_t na
         }
         else if (num_bdigits == numberof(fixbuf)) {
             val = bignew((long)num_bdigits+1, 0);
-	    MEMCPY(BDIGITS(val), fixbuf, BDIGIT, num_bdigits);
+            MEMCPY(BDIGITS(val), fixbuf, BDIGIT, num_bdigits);
             BDIGITS(val)[num_bdigits++] = 1;
         }
         else {
@@ -3694,9 +3763,9 @@ rb_integer_unpack(const void *words, size_t numwords, size_t wordsize, size_t na
         BDIGIT_DBL u = fixbuf[0] + BIGUP(fixbuf[1]);
         if (u == 0)
             return LONG2FIX(0);
-	if (0 < sign && POSFIXABLE(u))
+        if (0 < sign && POSFIXABLE(u))
             return LONG2FIX((long)u);
-	if (sign < 0 && BDIGIT_MSB(fixbuf[1]) == 0 &&
+        if (sign < 0 && BDIGIT_MSB(fixbuf[1]) == 0 &&
                 NEGFIXABLE(-(BDIGIT_DBL_SIGNED)u))
             return LONG2FIX((long)-(BDIGIT_DBL_SIGNED)u);
         val = bignew((long)num_bdigits, 0 <= sign);
@@ -3748,41 +3817,41 @@ str2big_scan_digits(const char *s, const char *str, int base, int badcheck, size
     int c;
 
     if (!len) {
-	*num_digits_p = 0;
-	*len_p = 0;
-	return TRUE;
+        *num_digits_p = 0;
+        *len_p = 0;
+        return TRUE;
     }
 
     if (badcheck && *str == '_') return FALSE;
 
     while ((c = *str++) != 0) {
-	if (c == '_') {
-	    if (nondigit) {
+        if (c == '_') {
+            if (nondigit) {
                 if (badcheck) return FALSE;
-		break;
-	    }
-	    nondigit = (char) c;
-	}
-	else if ((c = conv_digit(c)) < 0 || c >= base) {
-	    break;
-	}
-	else {
-	    nondigit = 0;
-	    num_digits++;
-	    digits_end = str;
-	}
-	if (len > 0 && !--len) break;
+                break;
+            }
+            nondigit = (char) c;
+        }
+        else if ((c = conv_digit(c)) < 0 || c >= base) {
+            break;
+        }
+        else {
+            nondigit = 0;
+            num_digits++;
+            digits_end = str;
+        }
+        if (len > 0 && !--len) break;
     }
     if (badcheck && nondigit) return FALSE;
     if (badcheck && len) {
-	str--;
-	while (*str && ISSPACE(*str)) {
-	    str++;
-	    if (len > 0 && !--len) break;
-	}
-	if (len && *str) {
-	    return FALSE;
-	}
+        str--;
+        while (*str && ISSPACE(*str)) {
+            str++;
+            if (len > 0 && !--len) break;
+        }
+        if (len && *str) {
+            return FALSE;
+        }
     }
     *num_digits_p = num_digits;
     *len_p = digits_end - digits_start;
@@ -3825,7 +3894,7 @@ str2big_poweroftwo(
     if (numbits) {
         *dp++ = BIGLO(dd);
     }
-    assert((size_t)(dp - BDIGITS(z)) == num_bdigits);
+    RUBY_ASSERT((size_t)(dp - BDIGITS(z)) == num_bdigits);
 
     return z;
 }
@@ -3868,7 +3937,7 @@ str2big_normal(
             }
             break;
         }
-        assert(blen <= num_bdigits);
+        RUBY_ASSERT(blen <= num_bdigits);
     }
 
     return z;
@@ -3926,7 +3995,7 @@ str2big_karatsuba(
             current_base = 1;
         }
     }
-    assert(i == num_bdigits);
+    RUBY_ASSERT(i == num_bdigits);
     for (unit = 2; unit < num_bdigits; unit *= 2) {
         for (i = 0; i < num_bdigits; i += unit*2) {
             if (2*unit <= num_bdigits - i) {
@@ -3957,7 +4026,7 @@ str2big_karatsuba(
     return z;
 }
 
-#ifdef USE_GMP
+#if USE_GMP
 static VALUE
 str2big_gmp(
     int sign,
@@ -4024,8 +4093,8 @@ rb_cstr_to_inum(const char *str, int base, int badcheck)
     char *end;
     VALUE ret = rb_cstr_parse_inum(str, -1, (badcheck ? NULL : &end), base);
     if (NIL_P(ret)) {
-	if (badcheck) rb_invalid_str(str, "Integer()");
-	ret = INT2FIX(0);
+        if (badcheck) rb_invalid_str(str, "Integer()");
+        ret = INT2FIX(0);
     }
     return ret;
 }
@@ -4049,7 +4118,7 @@ rb_cstr_to_inum(const char *str, int base, int badcheck)
 
 VALUE
 rb_int_parse_cstr(const char *str, ssize_t len, char **endp, size_t *ndigits,
-		  int base, int flags)
+                  int base, int flags)
 {
     const char *const s = str;
     char sign = 1;
@@ -4066,82 +4135,82 @@ rb_int_parse_cstr(const char *str, ssize_t len, char **endp, size_t *ndigits,
     const int badcheck = !endp;
 
 #define ADV(n) do {\
-	if (len > 0 && len <= (n)) goto bad; \
-	str += (n); \
-	len -= (n); \
+        if (len > 0 && len <= (n)) goto bad; \
+        str += (n); \
+        len -= (n); \
     } while (0)
 #define ASSERT_LEN() do {\
-	assert(len != 0); \
-	if (len0 >= 0) assert(s + len0 == str + len); \
+        RUBY_ASSERT(len != 0); \
+        if (len0 >= 0) RUBY_ASSERT(s + len0 == str + len); \
     } while (0)
 
     if (!str) {
         goto bad;
     }
     if (len && (flags & RB_INT_PARSE_SIGN)) {
-	while (ISSPACE(*str)) ADV(1);
+        while (ISSPACE(*str)) ADV(1);
 
-	if (str[0] == '+') {
-	    ADV(1);
-	}
-	else if (str[0] == '-') {
-	    ADV(1);
-	    sign = 0;
-	}
-	ASSERT_LEN();
+        if (str[0] == '+') {
+            ADV(1);
+        }
+        else if (str[0] == '-') {
+            ADV(1);
+            sign = 0;
+        }
+        ASSERT_LEN();
     }
     if (base <= 0) {
-	if (str[0] == '0' && len > 1) {
-	    switch (str[1]) {
-	      case 'x': case 'X':
-		base = 16;
-		ADV(2);
-		break;
-	      case 'b': case 'B':
-		base = 2;
-		ADV(2);
-		break;
-	      case 'o': case 'O':
-		base = 8;
-		ADV(2);
-		break;
-	      case 'd': case 'D':
-		base = 10;
-		ADV(2);
-		break;
-	      default:
-		base = 8;
-	    }
-	}
-	else if (base < -1) {
-	    base = -base;
-	}
-	else {
-	    base = 10;
-	}
+        if (str[0] == '0' && len > 1) {
+            switch (str[1]) {
+              case 'x': case 'X':
+                base = 16;
+                ADV(2);
+                break;
+              case 'b': case 'B':
+                base = 2;
+                ADV(2);
+                break;
+              case 'o': case 'O':
+                base = 8;
+                ADV(2);
+                break;
+              case 'd': case 'D':
+                base = 10;
+                ADV(2);
+                break;
+              default:
+                base = 8;
+            }
+        }
+        else if (base < -1) {
+            base = -base;
+        }
+        else {
+            base = 10;
+        }
     }
     else if (len == 1 || !(flags & RB_INT_PARSE_PREFIX)) {
-	/* no prefix */
+        /* no prefix */
     }
     else if (base == 2) {
-	if (str[0] == '0' && (str[1] == 'b'||str[1] == 'B')) {
-	    ADV(2);
-	}
+        if (str[0] == '0' && (str[1] == 'b'||str[1] == 'B')) {
+            ADV(2);
+        }
     }
     else if (base == 8) {
-	if (str[0] == '0' && (str[1] == 'o'||str[1] == 'O')) {
-	    ADV(2);
-	}
+        if (str[0] == '0' && (str[1] == 'o'||str[1] == 'O')) {
+            ADV(2);
+        }
     }
     else if (base == 10) {
-	if (str[0] == '0' && (str[1] == 'd'||str[1] == 'D')) {
-	    ADV(2);
-	}
+        if (str[0] == '0' && (str[1] == 'd'||str[1] == 'D')) {
+            ADV(2);
+        }
     }
     else if (base == 16) {
-	if (str[0] == '0' && (str[1] == 'x'||str[1] == 'X')) {
-	    ADV(2);
-	}
+        if (str[0] == '0' && (str[1] == 'x'||str[1] == 'X')) {
+            ADV(2);
+        }
     }
     if (!valid_radix_p(base)) {
         invalid_radix(base);
@@ -4149,80 +4218,79 @@ rb_int_parse_cstr(const char *str, ssize_t len, char **endp, size_t *ndigits,
     if (!len) goto bad;
     num_digits = str - s;
     if (*str == '0' && len != 1) { /* squeeze preceding 0s */
-	int us = 0;
-	const char *end = len < 0 ? NULL : str + len;
-	++num_digits;
-	while ((c = *++str) == '0' ||
-	       ((flags & RB_INT_PARSE_UNDERSCORE) && c == '_')) {
-	    if (c == '_') {
-		if (++us >= 2)
-		    break;
-	    }
-	    else {
-		++num_digits;
-		us = 0;
-	    }
-	    if (str == end) break;
-	}
-	if (!c || ISSPACE(c)) --str;
-	if (end) len = end - str;
-	ASSERT_LEN();
+        int us = 0;
+        const char *end = len < 0 ? NULL : str + len;
+        ++num_digits;
+        while ((c = *++str) == '0' ||
+               ((flags & RB_INT_PARSE_UNDERSCORE) && c == '_')) {
+            if (c == '_') {
+                if (++us >= 2)
+                    break;
+            }
+            else {
+                ++num_digits;
+                us = 0;
+            }
+            if (str == end) break;
+        }
+        if (!c || ISSPACE(c)) --str;
+        if (end) len = end - str;
     }
     c = *str;
     c = conv_digit(c);
     if (c < 0 || c >= base) {
-	if (!badcheck && num_digits) z = INT2FIX(0);
-	goto bad;
+        if (!badcheck && num_digits) z = INT2FIX(0);
+        goto bad;
     }
 
     if (ndigits) *ndigits = num_digits;
     val = ruby_scan_digits(str, len, base, &num_digits, &ov);
     if (!ov) {
-	const char *end = &str[num_digits];
-	if (num_digits > 0 && *end == '_' && (flags & RB_INT_PARSE_UNDERSCORE))
-	    goto bigparse;
-	if (endp) *endp = (char *)end;
-	if (ndigits) *ndigits += num_digits;
-	if (badcheck) {
-	    if (num_digits == 0) return Qnil; /* no number */
-	    while (len < 0 ? *end : end < str + len) {
-		if (!ISSPACE(*end)) return Qnil; /* trailing garbage */
-		end++;
-	    }
-	}
-
-	if (POSFIXABLE(val)) {
-	    if (sign) return LONG2FIX(val);
-	    else {
-		long result = -(long)val;
-		return LONG2FIX(result);
-	    }
-	}
-	else {
-	    VALUE big = rb_uint2big(val);
-	    BIGNUM_SET_SIGN(big, sign);
-	    return bignorm(big);
-	}
+        const char *end = &str[num_digits];
+        if (num_digits > 0 && *end == '_' && (flags & RB_INT_PARSE_UNDERSCORE))
+            goto bigparse;
+        if (endp) *endp = (char *)end;
+        if (ndigits) *ndigits += num_digits;
+        if (badcheck) {
+            if (num_digits == 0) return Qnil; /* no number */
+            while (len < 0 ? *end : end < str + len) {
+                if (!ISSPACE(*end)) return Qnil; /* trailing garbage */
+                end++;
+            }
+        }
+
+        if (POSFIXABLE(val)) {
+            if (sign) return LONG2FIX(val);
+            else {
+                long result = -(long)val;
+                return LONG2FIX(result);
+            }
+        }
+        else {
+            VALUE big = rb_uint2big(val);
+            BIGNUM_SET_SIGN(big, sign);
+            return bignorm(big);
+        }
     }
 
   bigparse:
     digits_start = str;
     if (!str2big_scan_digits(s, str, base, badcheck, &num_digits, &len))
-	goto bad;
+        goto bad;
     if (endp) *endp = (char *)(str + len);
     if (ndigits) *ndigits += num_digits;
     digits_end = digits_start + len;
 
     if (POW2_P(base)) {
         z = str2big_poweroftwo(sign, digits_start, digits_end, num_digits,
-			       bit_length(base-1));
+                               bit_length(base-1));
     }
     else {
         int digits_per_bdigits_dbl;
         maxpow_in_bdigit_dbl(base, &digits_per_bdigits_dbl);
         num_bdigits = roomof(num_digits, digits_per_bdigits_dbl)*2;
 
-#ifdef USE_GMP
+#if USE_GMP
         if (GMP_STR2BIG_DIGITS < num_bdigits) {
             z = str2big_gmp(sign, digits_start, digits_end, num_digits,
                     num_bdigits, base);
@@ -4251,7 +4319,7 @@ static VALUE
 rb_cstr_parse_inum(const char *str, ssize_t len, char **endp, int base)
 {
     return rb_int_parse_cstr(str, len, endp, NULL, base,
-			     RB_INT_PARSE_DEFAULT);
+                             RB_INT_PARSE_DEFAULT);
 }
 
 VALUE
@@ -4300,14 +4368,14 @@ rb_str2big_poweroftwo(VALUE arg, int base, int badcheck)
     s = str = StringValueCStr(arg);
     len = RSTRING_LEN(arg);
     if (*str == '-') {
-	len--;
+        len--;
         str++;
         positive_p = 0;
     }
 
     digits_start = str;
     if (!str2big_scan_digits(s, str, base, badcheck, &num_digits, &len))
-	invalid_integer(arg);
+        invalid_integer(arg);
     digits_end = digits_start + len;
 
     z = str2big_poweroftwo(positive_p, digits_start, digits_end, num_digits,
@@ -4339,14 +4407,14 @@ rb_str2big_normal(VALUE arg, int base, int badcheck)
     s = str = StringValuePtr(arg);
     len = RSTRING_LEN(arg);
     if (len > 0 && *str == '-') {
-	len--;
+        len--;
         str++;
         positive_p = 0;
     }
 
     digits_start = str;
     if (!str2big_scan_digits(s, str, base, badcheck, &num_digits, &len))
-	invalid_integer(arg);
+        invalid_integer(arg);
     digits_end = digits_start + len;
 
     maxpow_in_bdigit_dbl(base, &digits_per_bdigits_dbl);
@@ -4381,14 +4449,14 @@ rb_str2big_karatsuba(VALUE arg, int base, int badcheck)
     s = str = StringValuePtr(arg);
     len = RSTRING_LEN(arg);
     if (len > 0 && *str == '-') {
-	len--;
+        len--;
         str++;
         positive_p = 0;
     }
 
     digits_start = str;
     if (!str2big_scan_digits(s, str, base, badcheck, &num_digits, &len))
-	invalid_integer(arg);
+        invalid_integer(arg);
     digits_end = digits_start + len;
 
     maxpow_in_bdigit_dbl(base, &digits_per_bdigits_dbl);
@@ -4402,7 +4470,7 @@ rb_str2big_karatsuba(VALUE arg, int base, int badcheck)
     return bignorm(z);
 }
 
-#ifdef USE_GMP
+#if USE_GMP
 VALUE
 rb_str2big_gmp(VALUE arg, int base, int badcheck)
 {
@@ -4424,14 +4492,14 @@ rb_str2big_gmp(VALUE arg, int base, int badcheck)
     s = str = StringValuePtr(arg);
     len = RSTRING_LEN(arg);
     if (len > 0 && *str == '-') {
-	len--;
+        len--;
         str++;
         positive_p = 0;
     }
 
     digits_start = str;
     if (!str2big_scan_digits(s, str, base, badcheck, &num_digits, &len))
-	invalid_integer(arg);
+        invalid_integer(arg);
     digits_end = digits_start + len;
 
     maxpow_in_bdigit_dbl(base, &digits_per_bdigits_dbl);
@@ -4447,7 +4515,7 @@ rb_str2big_gmp(VALUE arg, int base, int badcheck)
 
 #if HAVE_LONG_LONG
 
-static VALUE
+VALUE
 rb_ull2big(unsigned LONG_LONG n)
 {
     long i;
@@ -4458,8 +4526,8 @@ rb_ull2big(unsigned LONG_LONG n)
     digits[0] = n;
 #else
     for (i = 0; i < bdigit_roomof(SIZEOF_LONG_LONG); i++) {
-	digits[i] = BIGLO(n);
-	n = BIGDN(n);
+        digits[i] = BIGLO(n);
+        n = BIGDN(n);
     }
 #endif
 
@@ -4469,7 +4537,7 @@ rb_ull2big(unsigned LONG_LONG n)
     return big;
 }
 
-static VALUE
+VALUE
 rb_ll2big(LONG_LONG n)
 {
     long neg = 0;
@@ -4478,14 +4546,14 @@ rb_ll2big(LONG_LONG n)
 
     if (n < 0) {
         u = 1 + (unsigned LONG_LONG)(-(n + 1)); /* u = -n avoiding overflow */
-	neg = 1;
+        neg = 1;
     }
     else {
         u = n;
     }
     big = rb_ull2big(u);
     if (neg) {
-	BIGNUM_SET_NEGATIVE_SIGN(big);
+        BIGNUM_SET_NEGATIVE_SIGN(big);
     }
     return big;
 }
@@ -4507,7 +4575,7 @@ rb_ll2inum(LONG_LONG n)
 #endif  /* HAVE_LONG_LONG */
 
 #ifdef HAVE_INT128_T
-static VALUE
+VALUE
 rb_uint128t2big(uint128_t n)
 {
     long i;
@@ -4515,7 +4583,7 @@ rb_uint128t2big(uint128_t n)
     BDIGIT *digits = BDIGITS(big);
 
     for (i = 0; i < bdigit_roomof(SIZEOF_INT128_T); i++) {
-	digits[i] = BIGLO(RSHIFT(n ,BITSPERDIG*i));
+        digits[i] = BIGLO(RSHIFT(n ,BITSPERDIG*i));
     }
 
     i = bdigit_roomof(SIZEOF_INT128_T);
@@ -4524,7 +4592,7 @@ rb_uint128t2big(uint128_t n)
     return big;
 }
 
-MJIT_FUNC_EXPORTED VALUE
+VALUE
 rb_int128t2big(int128_t n)
 {
     int neg = 0;
@@ -4533,14 +4601,14 @@ rb_int128t2big(int128_t n)
 
     if (n < 0) {
         u = 1 + (uint128_t)(-(n + 1)); /* u = -n avoiding overflow */
-	neg = 1;
+        neg = 1;
     }
     else {
         u = n;
     }
     big = rb_uint128t2big(u);
     if (neg) {
-	BIGNUM_SET_NEGATIVE_SIGN(big);
+        BIGNUM_SET_NEGATIVE_SIGN(big);
     }
     return big;
 }
@@ -4569,11 +4637,14 @@ big_shift3(VALUE x, int lshift_p, size_t shift_numdigits, int shift_numbits)
 
     if (lshift_p) {
         if (LONG_MAX < shift_numdigits) {
-            rb_raise(rb_eArgError, "too big number");
+          too_big:
+            rb_raise(rb_eRangeError, "shift width too big");
         }
         s1 = shift_numdigits;
         s2 = shift_numbits;
+        if ((size_t)s1 != shift_numdigits) goto too_big;
         xn = BIGNUM_LEN(x);
+        if (LONG_MAX/SIZEOF_BDIGIT <= xn+s1) goto too_big;
         z = bignew(xn+s1+1, BIGNUM_SIGN(x));
         zds = BDIGITS(z);
         BDIGITS_ZERO(zds, s1);
@@ -4615,8 +4686,8 @@ big_shift2(VALUE x, int lshift_p, VALUE y)
     size_t shift_numdigits;
     int shift_numbits;
 
-    assert(POW2_P(CHAR_BIT));
-    assert(POW2_P(BITSPERDIG));
+    RUBY_ASSERT(POW2_P(CHAR_BIT));
+    RUBY_ASSERT(POW2_P(BITSPERDIG));
 
     if (BIGZEROP(x))
         return INT2FIX(0);
@@ -4703,7 +4774,7 @@ power_cache_get_power(int base, int power_level, size_t *numdigits_ret)
         rb_obj_hide(power);
         base36_power_cache[base - 2][power_level] = power;
         base36_numdigits_cache[base - 2][power_level] = numdigits;
-	rb_gc_register_mark_object(power);
+        rb_vm_register_global_object(power);
     }
     if (numdigits_ret)
         *numdigits_ret = base36_numdigits_cache[base - 2][power_level];
@@ -4739,7 +4810,7 @@ big2str_2bdigits(struct big2str_struct *b2s, BDIGIT *xds, size_t xn, size_t tail
     int beginning = !b2s->ptr;
     size_t len = 0;
 
-    assert(xn <= 2);
+    RUBY_ASSERT(xn <= 2);
     num = bary2bdigitdbl(xds, xn);
 
     if (beginning) {
@@ -4754,7 +4825,7 @@ big2str_2bdigits(struct big2str_struct *b2s, BDIGIT *xds, size_t xn, size_t tail
         } while (num);
         len = sizeof(buf) - j;
         big2str_alloc(b2s, len + taillen);
-	MEMCPY(b2s->ptr, buf + j, char, len);
+        MEMCPY(b2s->ptr, buf + j, char, len);
     }
     else {
         p = b2s->ptr;
@@ -4771,7 +4842,7 @@ big2str_2bdigits(struct big2str_struct *b2s, BDIGIT *xds, size_t xn, size_t tail
 
 static void
 big2str_karatsuba(struct big2str_struct *b2s, BDIGIT *xds, size_t xn, size_t wn,
-		  int power_level, size_t taillen)
+                  int power_level, size_t taillen)
 {
     VALUE b;
     size_t half_numdigits, lower_numdigits;
@@ -4801,17 +4872,17 @@ big2str_karatsuba(struct big2str_struct *b2s, BDIGIT *xds, size_t xn, size_t wn,
      */
 
     if (xn == 0 || bary_zero_p(xds, xn)) {
-	if (b2s->ptr) {
+        if (b2s->ptr) {
             /* When x is zero, power_cache_get_power(base, power_level) should be cached already. */
             power_cache_get_power(b2s->base, power_level, &len);
-	    memset(b2s->ptr, '0', len);
+            memset(b2s->ptr, '0', len);
             b2s->ptr += len;
-	}
+        }
         return;
     }
 
     if (power_level == 0) {
-	big2str_2bdigits(b2s, xds, xn, taillen);
+        big2str_2bdigits(b2s, xds, xn, taillen);
         return;
     }
 
@@ -4839,7 +4910,7 @@ big2str_karatsuba(struct big2str_struct *b2s, BDIGIT *xds, size_t xn, size_t wn,
             memset(b2s->ptr, '0', len);
             b2s->ptr += len;
         }
-	big2str_2bdigits(b2s, xds, xn, taillen);
+        big2str_2bdigits(b2s, xds, xn, taillen);
     }
     else {
         BDIGIT *qds, *rds;
@@ -4867,7 +4938,7 @@ big2str_karatsuba(struct big2str_struct *b2s, BDIGIT *xds, size_t xn, size_t wn,
             /* bigdivrem_restoring will modify y.
              * So use temporary buffer.  */
             tds = xds + qn;
-            assert(qn + bn <= xn + wn);
+            RUBY_ASSERT(qn + bn <= xn + wn);
             bary_small_lshift(tds, bds, bn, shift);
             xds[xn] = bary_small_lshift(xds, xds, xn, shift);
         }
@@ -4885,7 +4956,7 @@ big2str_karatsuba(struct big2str_struct *b2s, BDIGIT *xds, size_t xn, size_t wn,
         }
 
         BARY_TRUNC(qds, qn);
-        assert(qn <= bn);
+        RUBY_ASSERT(qn <= bn);
         big2str_karatsuba(b2s, qds, qn, xn+wn - (rn+qn), lower_power_level, lower_numdigits+taillen);
         BARY_TRUNC(rds, rn);
         big2str_karatsuba(b2s, rds, rn, xn+wn - rn, lower_power_level, taillen);
@@ -4943,14 +5014,14 @@ big2str_generic(VALUE x, int base)
     BARY_TRUNC(xds, xn);
 
     if (xn == 0) {
-	return rb_usascii_str_new2("0");
+        return rb_usascii_str_new2("0");
     }
 
     if (!valid_radix_p(base))
-	invalid_radix(base);
+        invalid_radix(base);
 
     if (xn >= LONG_MAX/BITSPERDIG) {
-        rb_raise(rb_eRangeError, "bignum too big to convert into `string'");
+        rb_raise(rb_eRangeError, "bignum too big to convert into 'string'");
     }
 
     power_level = 0;
@@ -4960,7 +5031,7 @@ big2str_generic(VALUE x, int base)
         power_level++;
         power = power_cache_get_power(base, power_level, NULL);
     }
-    assert(power_level != MAX_BASE36_POWER_TABLE_ENTRIES);
+    RUBY_ASSERT(power_level != MAX_BASE36_POWER_TABLE_ENTRIES);
 
     if ((size_t)BIGNUM_LEN(power) <= xn) {
         /*
@@ -4984,7 +5055,7 @@ big2str_generic(VALUE x, int base)
     b2s_data.ptr = NULL;
 
     if (power_level == 0) {
-	big2str_2bdigits(&b2s_data, xds, xn, 0);
+        big2str_2bdigits(&b2s_data, xds, xn, 0);
     }
     else {
         VALUE tmpw = 0;
@@ -4993,7 +5064,7 @@ big2str_generic(VALUE x, int base)
         wn = power_level * BIGDIVREM_EXTRA_WORDS + BIGNUM_LEN(power);
         wds = ALLOCV_N(BDIGIT, tmpw, xn + wn);
         MEMCPY(wds, xds, BDIGIT, xn);
-	big2str_karatsuba(&b2s_data, wds, xn, wn, power_level, 0);
+        big2str_karatsuba(&b2s_data, wds, xn, wn, power_level, 0);
         if (tmpw)
             ALLOCV_END(tmpw);
     }
@@ -5012,7 +5083,7 @@ rb_big2str_generic(VALUE x, int base)
     return big2str_generic(x, base);
 }
 
-#ifdef USE_GMP
+#if USE_GMP
 static VALUE
 big2str_gmp(VALUE x, int base)
 {
@@ -5059,7 +5130,7 @@ rb_big2str1(VALUE x, int base)
     size_t xn;
 
     if (FIXNUM_P(x)) {
-	return rb_fix2str(x, base);
+        return rb_fix2str(x, base);
     }
 
     bigtrunc(x);
@@ -5068,14 +5139,14 @@ rb_big2str1(VALUE x, int base)
     BARY_TRUNC(xds, xn);
 
     if (xn == 0) {
-	return rb_usascii_str_new2("0");
+        return rb_usascii_str_new2("0");
     }
 
     if (!valid_radix_p(base))
-	invalid_radix(base);
+        invalid_radix(base);
 
     if (xn >= LONG_MAX/BITSPERDIG) {
-        rb_raise(rb_eRangeError, "bignum too big to convert into `string'");
+        rb_raise(rb_eRangeError, "bignum too big to convert into 'string'");
     }
 
     if (POW2_P(base)) {
@@ -5083,7 +5154,7 @@ rb_big2str1(VALUE x, int base)
         return big2str_base_poweroftwo(x, base);
     }
 
-#ifdef USE_GMP
+#if USE_GMP
     if (GMP_BIG2STR_DIGITS < xn) {
         return big2str_gmp(x, base);
     }
@@ -5111,7 +5182,7 @@ big2ulong(VALUE x, const char *type)
     if (len == 0)
         return 0;
     if (BIGSIZE(x) > sizeof(long)) {
-        rb_raise(rb_eRangeError, "bignum too big to convert into `%s'", type);
+        rb_raise(rb_eRangeError, "bignum too big to convert into '%s'", type);
     }
     ds = BDIGITS(x);
 #if SIZEOF_LONG <= SIZEOF_BDIGIT
@@ -5119,7 +5190,7 @@ big2ulong(VALUE x, const char *type)
 #else
     num = 0;
     for (i = 0; i < len; i++) {
-	num <<= BITSPERDIG;
+        num <<= BITSPERDIG;
         num += (unsigned long)ds[len - i - 1]; /* overflow is already checked */
     }
 #endif
@@ -5154,7 +5225,7 @@ rb_big2long(VALUE x)
         if (num <= 1+(unsigned long)(-(LONG_MIN+1)))
             return -(long)(num-1)-1;
     }
-    rb_raise(rb_eRangeError, "bignum too big to convert into `long'");
+    rb_raise(rb_eRangeError, "bignum too big to convert into 'long'");
 }
 
 #if HAVE_LONG_LONG
@@ -5172,13 +5243,13 @@ big2ull(VALUE x, const char *type)
     if (len == 0)
         return 0;
     if (BIGSIZE(x) > SIZEOF_LONG_LONG)
-	rb_raise(rb_eRangeError, "bignum too big to convert into `%s'", type);
+        rb_raise(rb_eRangeError, "bignum too big to convert into '%s'", type);
 #if SIZEOF_LONG_LONG <= SIZEOF_BDIGIT
     num = (unsigned LONG_LONG)ds[0];
 #else
     num = 0;
     for (i = 0; i < len; i++) {
-	num = BIGUP(num);
+        num = BIGUP(num);
         num += ds[len - i - 1];
     }
 #endif
@@ -5213,7 +5284,7 @@ rb_big2ll(VALUE x)
         if (num <= 1+(unsigned LONG_LONG)(-(LLONG_MIN+1)))
             return -(LONG_LONG)(num-1)-1;
     }
-    rb_raise(rb_eRangeError, "bignum too big to convert into `long long'");
+    rb_raise(rb_eRangeError, "bignum too big to convert into 'long long'");
 }
 
 #endif  /* HAVE_LONG_LONG */
@@ -5228,23 +5299,23 @@ dbl2big(double d)
     double u = (d < 0)?-d:d;
 
     if (isinf(d)) {
-	rb_raise(rb_eFloatDomainError, d < 0 ? "-Infinity" : "Infinity");
+        rb_raise(rb_eFloatDomainError, d < 0 ? "-Infinity" : "Infinity");
     }
     if (isnan(d)) {
-	rb_raise(rb_eFloatDomainError, "NaN");
+        rb_raise(rb_eFloatDomainError, "NaN");
     }
 
     while (1.0 <= u) {
-	u /= (double)(BIGRAD);
-	i++;
+        u /= (double)(BIGRAD);
+        i++;
     }
     z = bignew(i, d>=0);
     digits = BDIGITS(z);
     while (i--) {
-	u *= BIGRAD;
-	c = (BDIGIT)u;
-	u -= c;
-	digits[i] = c;
+        u *= BIGRAD;
+        c = (BDIGIT)u;
+        u -= c;
+        digits[i] = c;
     }
 
     return z;
@@ -5264,28 +5335,28 @@ big2dbl(VALUE x)
     BDIGIT *ds = BDIGITS(x), dl;
 
     if (i) {
-	bits = i * BITSPERDIG - nlz(ds[i-1]);
-	if (bits > DBL_MANT_DIG+DBL_MAX_EXP) {
-	    d = HUGE_VAL;
-	}
-	else {
-	    if (bits > DBL_MANT_DIG+1)
-		lo = (bits -= DBL_MANT_DIG+1) / BITSPERDIG;
-	    else
-		bits = 0;
-	    while (--i > lo) {
-		d = ds[i] + BIGRAD*d;
-	    }
-	    dl = ds[i];
-	    if (bits && (dl & ((BDIGIT)1 << (bits %= BITSPERDIG)))) {
-		int carry = (dl & ~(BDIGMAX << bits)) != 0;
-		if (!carry) {
-		    while (i-- > 0) {
-			carry = ds[i] != 0;
-			if (carry) break;
-		    }
-		}
-		if (carry) {
+        bits = i * BITSPERDIG - nlz(ds[i-1]);
+        if (bits > DBL_MANT_DIG+DBL_MAX_EXP) {
+            d = HUGE_VAL;
+        }
+        else {
+            if (bits > DBL_MANT_DIG+1)
+                lo = (bits -= DBL_MANT_DIG+1) / BITSPERDIG;
+            else
+                bits = 0;
+            while (--i > lo) {
+                d = ds[i] + BIGRAD*d;
+            }
+            dl = ds[i];
+            if (bits && (dl & ((BDIGIT)1 << (bits %= BITSPERDIG)))) {
+                int carry = (dl & ~(BDIGMAX << bits)) != 0;
+                if (!carry) {
+                    while (i-- > 0) {
+                        carry = ds[i] != 0;
+                        if (carry) break;
+                    }
+                }
+                if (carry) {
                     BDIGIT mask = BDIGMAX;
                     BDIGIT bit = 1;
                     mask <<= bits;
@@ -5293,19 +5364,19 @@ big2dbl(VALUE x)
                     dl &= mask;
                     dl += bit;
                     dl = BIGLO(dl);
-		    if (!dl) d += 1;
-		}
-	    }
-	    d = dl + BIGRAD*d;
-	    if (lo) {
-		if (lo > INT_MAX / BITSPERDIG)
-		    d = HUGE_VAL;
-		else if (lo < INT_MIN / BITSPERDIG)
-		    d = 0.0;
-		else
-		    d = ldexp(d, (int)(lo * BITSPERDIG));
-	    }
-	}
+                    if (!dl) d += 1;
+                }
+            }
+            d = dl + BIGRAD*d;
+            if (lo) {
+                if (lo > INT_MAX / BITSPERDIG)
+                    d = HUGE_VAL;
+                else if (lo < INT_MIN / BITSPERDIG)
+                    d = 0.0;
+                else
+                    d = ldexp(d, (int)(lo * BITSPERDIG));
+            }
+        }
     }
     if (BIGNUM_NEGATIVE_P(x)) d = -d;
     return d;
@@ -5317,11 +5388,11 @@ rb_big2dbl(VALUE x)
     double d = big2dbl(x);
 
     if (isinf(d)) {
-	rb_warning("Integer out of Float range");
-	if (d < 0.0)
-	    d = -HUGE_VAL;
-	else
-	    d = HUGE_VAL;
+        rb_warning("Integer out of Float range");
+        if (d < 0.0)
+            d = -HUGE_VAL;
+        else
+            d = HUGE_VAL;
     }
     return d;
 }
@@ -5418,26 +5489,26 @@ VALUE
 rb_big_cmp(VALUE x, VALUE y)
 {
     if (FIXNUM_P(y)) {
-	x = bigfixize(x);
+        x = bigfixize(x);
         if (FIXNUM_P(x)) {
-	    /* SIGNED_VALUE and Fixnum have same sign-bits, same
-	     * order */
-	    SIGNED_VALUE sx = (SIGNED_VALUE)x, sy = (SIGNED_VALUE)y;
-	    if (sx < sy) return INT2FIX(-1);
-	    return INT2FIX(sx > sy);
+            /* SIGNED_VALUE and Fixnum have same sign-bits, same
+             * order */
+            SIGNED_VALUE sx = (SIGNED_VALUE)x, sy = (SIGNED_VALUE)y;
+            if (sx < sy) return INT2FIX(-1);
+            return INT2FIX(sx > sy);
         }
     }
     else if (RB_BIGNUM_TYPE_P(y)) {
-	if (BIGNUM_SIGN(x) == BIGNUM_SIGN(y)) {
-	    int cmp = bary_cmp(BDIGITS(x), BIGNUM_LEN(x), BDIGITS(y), BIGNUM_LEN(y));
-	    return INT2FIX(BIGNUM_SIGN(x) ? cmp : -cmp);
-	}
+        if (BIGNUM_SIGN(x) == BIGNUM_SIGN(y)) {
+            int cmp = bary_cmp(BDIGITS(x), BIGNUM_LEN(x), BDIGITS(y), BIGNUM_LEN(y));
+            return INT2FIX(BIGNUM_SIGN(x) ? cmp : -cmp);
+        }
     }
     else if (RB_FLOAT_TYPE_P(y)) {
         return rb_integer_float_cmp(x, y);
     }
     else {
-	return rb_num_coerce_cmp(x, y, idCmp);
+        return rb_num_coerce_cmp(x, y, idCmp);
     }
     return INT2FIX(BIGNUM_SIGN(x) ? 1 : -1);
 }
@@ -5456,30 +5527,30 @@ big_op(VALUE x, VALUE y, enum big_op_t op)
     int n;
 
     if (RB_INTEGER_TYPE_P(y)) {
-	rel = rb_big_cmp(x, y);
+        rel = rb_big_cmp(x, y);
     }
     else if (RB_FLOAT_TYPE_P(y)) {
         rel = rb_integer_float_cmp(x, y);
     }
     else {
-	ID id = 0;
-	switch (op) {
-	  case big_op_gt: id = '>'; break;
-	  case big_op_ge: id = idGE; break;
-	  case big_op_lt: id = '<'; break;
-	  case big_op_le: id = idLE; break;
-	}
-	return rb_num_coerce_relop(x, y, id);
+        ID id = 0;
+        switch (op) {
+          case big_op_gt: id = '>'; break;
+          case big_op_ge: id = idGE; break;
+          case big_op_lt: id = '<'; break;
+          case big_op_le: id = idLE; break;
+        }
+        return rb_num_coerce_relop(x, y, id);
     }
 
     if (NIL_P(rel)) return Qfalse;
     n = FIX2INT(rel);
 
     switch (op) {
-	case big_op_gt: return RBOOL(n >  0);
-	case big_op_ge: return RBOOL(n >= 0);
-	case big_op_lt: return RBOOL(n <  0);
-	case big_op_le: return RBOOL(n <= 0);
+      case big_op_gt: return RBOOL(n >  0);
+      case big_op_ge: return RBOOL(n >= 0);
+      case big_op_lt: return RBOOL(n <  0);
+      case big_op_le: return RBOOL(n <= 0);
     }
     return Qundef;
 }
@@ -5523,7 +5594,7 @@ VALUE
 rb_big_eq(VALUE x, VALUE y)
 {
     if (FIXNUM_P(y)) {
-	return RBOOL(bignorm(x) == y);
+        return RBOOL(bignorm(x) == y);
     }
     else if (RB_BIGNUM_TYPE_P(y)) {
     }
@@ -5531,7 +5602,7 @@ rb_big_eq(VALUE x, VALUE y)
         return rb_integer_float_eq(x, y);
     }
     else {
-	return rb_equal(y, x);
+        return rb_equal(y, x);
     }
     if (BIGNUM_SIGN(x) != BIGNUM_SIGN(y)) return Qfalse;
     if (BIGNUM_LEN(x) != BIGNUM_LEN(y)) return Qfalse;
@@ -5635,13 +5706,13 @@ bigsub_int(VALUE x, long y0)
     zds = BDIGITS(z);
 
 #if SIZEOF_BDIGIT >= SIZEOF_LONG
-    assert(xn == zn);
+    RUBY_ASSERT(xn == zn);
     num = (BDIGIT_DBL_SIGNED)xds[0] - y;
     if (xn == 1 && num < 0) {
-	BIGNUM_NEGATE(z);
-	zds[0] = (BDIGIT)-num;
-	RB_GC_GUARD(x);
-	return bignorm(z);
+        BIGNUM_NEGATE(z);
+        zds[0] = (BDIGIT)-num;
+        RB_GC_GUARD(x);
+        return bignorm(z);
     }
     zds[0] = BIGLO(num);
     num = BIGDN(num);
@@ -5653,10 +5724,10 @@ bigsub_int(VALUE x, long y0)
     num = 0;
     for (i=0; i < xn; i++) {
         if (y == 0) goto y_is_zero_x;
-	num += (BDIGIT_DBL_SIGNED)xds[i] - BIGLO(y);
-	zds[i] = BIGLO(num);
-	num = BIGDN(num);
-	y = BIGDN(y);
+        num += (BDIGIT_DBL_SIGNED)xds[i] - BIGLO(y);
+        zds[i] = BIGLO(num);
+        num = BIGDN(num);
+        y = BIGDN(y);
     }
     for (; i < zn; i++) {
         if (y == 0) goto y_is_zero_z;
@@ -5671,9 +5742,9 @@ bigsub_int(VALUE x, long y0)
     for (; i < xn; i++) {
       y_is_zero_x:
         if (num == 0) goto num_is_zero_x;
-	num += xds[i];
-	zds[i] = BIGLO(num);
-	num = BIGDN(num);
+        num += xds[i];
+        zds[i] = BIGLO(num);
+        num = BIGDN(num);
     }
 #if SIZEOF_BDIGIT < SIZEOF_LONG
     for (; i < zn; i++) {
@@ -5687,7 +5758,7 @@ bigsub_int(VALUE x, long y0)
 
     for (; i < xn; i++) {
       num_is_zero_x:
-	zds[i] = xds[i];
+        zds[i] = xds[i];
     }
 #if SIZEOF_BDIGIT < SIZEOF_LONG
     for (; i < zn; i++) {
@@ -5698,10 +5769,10 @@ bigsub_int(VALUE x, long y0)
     goto finish;
 
   finish:
-    assert(num == 0 || num == -1);
+    RUBY_ASSERT(num == 0 || num == -1);
     if (num < 0) {
         get2comp(z);
-	BIGNUM_NEGATE(z);
+        BIGNUM_NEGATE(z);
     }
     RB_GC_GUARD(x);
     return bignorm(z);
@@ -5744,17 +5815,17 @@ bigadd_int(VALUE x, long y)
     num = 0;
     for (i=0; i < xn; i++) {
         if (y == 0) goto y_is_zero_x;
-	num += (BDIGIT_DBL)xds[i] + BIGLO(y);
-	zds[i] = BIGLO(num);
-	num = BIGDN(num);
-	y = BIGDN(y);
+        num += (BDIGIT_DBL)xds[i] + BIGLO(y);
+        zds[i] = BIGLO(num);
+        num = BIGDN(num);
+        y = BIGDN(y);
     }
     for (; i < zn; i++) {
         if (y == 0) goto y_is_zero_z;
-	num += BIGLO(y);
-	zds[i] = BIGLO(num);
-	num = BIGDN(num);
-	y = BIGDN(y);
+        num += BIGLO(y);
+        zds[i] = BIGLO(num);
+        num = BIGDN(num);
+        y = BIGDN(y);
     }
     goto finish;
 
@@ -5763,25 +5834,25 @@ bigadd_int(VALUE x, long y)
     for (;i < xn; i++) {
       y_is_zero_x:
         if (num == 0) goto num_is_zero_x;
-	num += (BDIGIT_DBL)xds[i];
-	zds[i] = BIGLO(num);
-	num = BIGDN(num);
+        num += (BDIGIT_DBL)xds[i];
+        zds[i] = BIGLO(num);
+        num = BIGDN(num);
     }
     for (; i < zn; i++) {
       y_is_zero_z:
         if (num == 0) goto num_is_zero_z;
-	zds[i] = BIGLO(num);
-	num = BIGDN(num);
+        zds[i] = BIGLO(num);
+        num = BIGDN(num);
     }
     goto finish;
 
     for (;i < xn; i++) {
       num_is_zero_x:
-	zds[i] = xds[i];
+        zds[i] = xds[i];
     }
     for (; i < zn; i++) {
       num_is_zero_z:
-	zds[i] = 0;
+        zds[i] = 0;
     }
     goto finish;
 
@@ -5798,15 +5869,15 @@ bigadd(VALUE x, VALUE y, int sign)
 
     sign = (sign == BIGNUM_SIGN(y));
     if (BIGNUM_SIGN(x) != sign) {
-	if (sign) return bigsub(y, x);
-	return bigsub(x, y);
+        if (sign) return bigsub(y, x);
+        return bigsub(x, y);
     }
 
     if (BIGNUM_LEN(x) > BIGNUM_LEN(y)) {
-	len = BIGNUM_LEN(x) + 1;
+        len = BIGNUM_LEN(x) + 1;
     }
     else {
-	len = BIGNUM_LEN(y) + 1;
+        len = BIGNUM_LEN(y) + 1;
     }
     z = bignew(len, sign);
 
@@ -5823,26 +5894,26 @@ rb_big_plus(VALUE x, VALUE y)
     long n;
 
     if (FIXNUM_P(y)) {
-	n = FIX2LONG(y);
-	if ((n > 0) != BIGNUM_SIGN(x)) {
-	    if (n < 0) {
-		n = -n;
-	    }
-	    return bigsub_int(x, n);
-	}
-	if (n < 0) {
-	    n = -n;
-	}
-	return bigadd_int(x, n);
+        n = FIX2LONG(y);
+        if ((n > 0) != BIGNUM_SIGN(x)) {
+            if (n < 0) {
+                n = -n;
+            }
+            return bigsub_int(x, n);
+        }
+        if (n < 0) {
+            n = -n;
+        }
+        return bigadd_int(x, n);
     }
     else if (RB_BIGNUM_TYPE_P(y)) {
-	return bignorm(bigadd(x, y, 1));
+        return bignorm(bigadd(x, y, 1));
     }
     else if (RB_FLOAT_TYPE_P(y)) {
-	return DBL2NUM(rb_big2dbl(x) + RFLOAT_VALUE(y));
+        return DBL2NUM(rb_big2dbl(x) + RFLOAT_VALUE(y));
     }
     else {
-	return rb_num_coerce_bin(x, y, '+');
+        return rb_num_coerce_bin(x, y, '+');
     }
 }
 
@@ -5852,26 +5923,26 @@ rb_big_minus(VALUE x, VALUE y)
     long n;
 
     if (FIXNUM_P(y)) {
-	n = FIX2LONG(y);
-	if ((n > 0) != BIGNUM_SIGN(x)) {
-	    if (n < 0) {
-		n = -n;
-	    }
-	    return bigadd_int(x, n);
-	}
-	if (n < 0) {
-	    n = -n;
-	}
-	return bigsub_int(x, n);
+        n = FIX2LONG(y);
+        if ((n > 0) != BIGNUM_SIGN(x)) {
+            if (n < 0) {
+                n = -n;
+            }
+            return bigadd_int(x, n);
+        }
+        if (n < 0) {
+            n = -n;
+        }
+        return bigsub_int(x, n);
     }
     else if (RB_BIGNUM_TYPE_P(y)) {
-	return bignorm(bigadd(x, y, 0));
+        return bignorm(bigadd(x, y, 0));
     }
     else if (RB_FLOAT_TYPE_P(y)) {
-	return DBL2NUM(rb_big2dbl(x) - RFLOAT_VALUE(y));
+        return DBL2NUM(rb_big2dbl(x) - RFLOAT_VALUE(y));
     }
     else {
-	return rb_num_coerce_bin(x, y, '-');
+        return rb_num_coerce_bin(x, y, '-');
     }
 }
 
@@ -5883,6 +5954,8 @@ bigsq(VALUE x)
     BDIGIT *xds, *zds;
 
     xn = BIGNUM_LEN(x);
+    if (MUL_OVERFLOW_LONG_P(2, xn))
+        rb_raise(rb_eArgError, "square overflow");
     zn = 2 * xn;
 
     z = bignew(zn, 1);
@@ -5911,6 +5984,8 @@ bigmul0(VALUE x, VALUE y)
 
     xn = BIGNUM_LEN(x);
     yn = BIGNUM_LEN(y);
+    if (ADD_OVERFLOW_LONG_P(xn, yn))
+        rb_raise(rb_eArgError, "multiplication overflow");
     zn = xn + yn;
 
     z = bignew(zn, BIGNUM_SIGN(x)==BIGNUM_SIGN(y));
@@ -5930,15 +6005,15 @@ VALUE
 rb_big_mul(VALUE x, VALUE y)
 {
     if (FIXNUM_P(y)) {
-	y = rb_int2big(FIX2LONG(y));
+        y = rb_int2big(FIX2LONG(y));
     }
     else if (RB_BIGNUM_TYPE_P(y)) {
     }
     else if (RB_FLOAT_TYPE_P(y)) {
-	return DBL2NUM(rb_big2dbl(x) * RFLOAT_VALUE(y));
+        return DBL2NUM(rb_big2dbl(x) * RFLOAT_VALUE(y));
     }
     else {
-	return rb_num_coerce_bin(x, y, '*');
+        return rb_num_coerce_bin(x, y, '*');
     }
 
     return bignorm(bigmul0(x, y));
@@ -5965,21 +6040,21 @@ bigdivrem(VALUE x, VALUE y, volatile VALUE *divp, volatile VALUE *modp)
     BARY_TRUNC(xds, xn);
 
     if (xn < yn || (xn == yn && xds[xn - 1] < yds[yn - 1])) {
-	if (divp) *divp = rb_int2big(0);
-	if (modp) *modp = x;
-	return Qnil;
+        if (divp) *divp = rb_int2big(0);
+        if (modp) *modp = x;
+        return Qnil;
     }
     if (yn == 1) {
-	dd = yds[0];
-	z = bignew(xn, BIGNUM_SIGN(x)==BIGNUM_SIGN(y));
-	zds = BDIGITS(z);
+        dd = yds[0];
+        z = bignew(xn, BIGNUM_SIGN(x)==BIGNUM_SIGN(y));
+        zds = BDIGITS(z);
         dd = bigdivrem_single(zds, xds, xn, dd);
-	if (modp) {
-	    *modp = rb_uint2big((uintptr_t)dd);
-	    BIGNUM_SET_SIGN(*modp, BIGNUM_SIGN(x));
-	}
-	if (divp) *divp = z;
-	return Qnil;
+        if (modp) {
+            *modp = rb_uint2big((uintptr_t)dd);
+            BIGNUM_SET_SIGN(*modp, BIGNUM_SIGN(x));
+        }
+        if (divp) *divp = z;
+        return Qnil;
     }
     if (xn == 2 && yn == 2) {
         BDIGIT_DBL x0 = bary2bdigitdbl(xds, 2);
@@ -6044,11 +6119,11 @@ bigdivmod(VALUE x, VALUE y, volatile VALUE *divp, volatile VALUE *modp)
 
     bigdivrem(x, y, divp, &mod);
     if (BIGNUM_SIGN(x) != BIGNUM_SIGN(y) && !BIGZEROP(mod)) {
-	if (divp) *divp = bigadd(*divp, rb_int2big(1), 0);
-	if (modp) *modp = bigadd(mod, y, 1);
+        if (divp) *divp = bigadd(*divp, rb_int2big(1), 0);
+        if (modp) *modp = bigadd(mod, y, 1);
     }
     else if (modp) {
-	*modp = mod;
+        *modp = mod;
     }
 }
 
@@ -6059,25 +6134,25 @@ rb_big_divide(VALUE x, VALUE y, ID op)
     VALUE z;
 
     if (FIXNUM_P(y)) {
-	y = rb_int2big(FIX2LONG(y));
+        y = rb_int2big(FIX2LONG(y));
     }
     else if (RB_BIGNUM_TYPE_P(y)) {
     }
     else if (RB_FLOAT_TYPE_P(y)) {
-	if (op == '/') {
+        if (op == '/') {
             double dx = rb_big2dbl(x);
             return rb_flo_div_flo(DBL2NUM(dx), y);
-	}
-	else {
+        }
+        else {
             VALUE v;
-	    double dy = RFLOAT_VALUE(y);
-	    if (dy == 0.0) rb_num_zerodiv();
+            double dy = RFLOAT_VALUE(y);
+            if (dy == 0.0) rb_num_zerodiv();
             v = rb_big_divide(x, y, '/');
             return rb_dbl2big(RFLOAT_VALUE(v));
-	}
+        }
     }
     else {
-	return rb_num_coerce_bin(x, y, op);
+        return rb_num_coerce_bin(x, y, op);
     }
     bigdivmod(x, y, &z, 0);
 
@@ -6102,10 +6177,10 @@ rb_big_modulo(VALUE x, VALUE y)
     VALUE z;
 
     if (FIXNUM_P(y)) {
-	y = rb_int2big(FIX2LONG(y));
+        y = rb_int2big(FIX2LONG(y));
     }
     else if (!RB_BIGNUM_TYPE_P(y)) {
-	return rb_num_coerce_bin(x, y, '%');
+        return rb_num_coerce_bin(x, y, '%');
     }
     bigdivmod(x, y, 0, &z);
 
@@ -6118,10 +6193,10 @@ rb_big_remainder(VALUE x, VALUE y)
     VALUE z;
 
     if (FIXNUM_P(y)) {
-	y = rb_int2big(FIX2LONG(y));
+        y = rb_int2big(FIX2LONG(y));
     }
     else if (!RB_BIGNUM_TYPE_P(y)) {
-	return rb_num_coerce_bin(x, y, rb_intern("remainder"));
+        return rb_num_coerce_bin(x, y, rb_intern("remainder"));
     }
     bigdivrem(x, y, 0, &z);
 
@@ -6134,7 +6209,7 @@ rb_big_divmod(VALUE x, VALUE y)
     VALUE div, mod;
 
     if (FIXNUM_P(y)) {
-	y = rb_int2big(FIX2LONG(y));
+        y = rb_int2big(FIX2LONG(y));
     }
     else if (!RB_BIGNUM_TYPE_P(y)) {
         return rb_num_coerce_bin(x, y, idDivmod);
@@ -6148,9 +6223,9 @@ static VALUE
 big_shift(VALUE x, long n)
 {
     if (n < 0)
-	return big_lshift(x, 1+(unsigned long)(-(n+1)));
+        return big_lshift(x, 1+(unsigned long)(-(n+1)));
     else if (n > 0)
-	return big_rshift(x, (unsigned long)n);
+        return big_rshift(x, (unsigned long)n);
     return x;
 }
 
@@ -6174,9 +6249,9 @@ big_fdiv(VALUE x, VALUE y, long ey)
     l = ex - ey;
 #if SIZEOF_LONG > SIZEOF_INT
     {
-	/* Visual C++ can't be here */
-	if (l > INT_MAX) return HUGE_VAL;
-	if (l < INT_MIN) return 0.0;
+        /* Visual C++ can't be here */
+        if (l > INT_MAX) return HUGE_VAL;
+        if (l < INT_MIN) return 0.0;
     }
 #endif
     return ldexp(big2dbl(z), (int)l);
@@ -6210,19 +6285,19 @@ rb_big_fdiv_double(VALUE x, VALUE y)
 
     dx = big2dbl(x);
     if (FIXNUM_P(y)) {
-	dy = (double)FIX2LONG(y);
-	if (isinf(dx))
-	    return big_fdiv_int(x, rb_int2big(FIX2LONG(y)));
+        dy = (double)FIX2LONG(y);
+        if (isinf(dx))
+            return big_fdiv_int(x, rb_int2big(FIX2LONG(y)));
     }
     else if (RB_BIGNUM_TYPE_P(y)) {
-	return big_fdiv_int(x, y);
+        return big_fdiv_int(x, y);
     }
     else if (RB_FLOAT_TYPE_P(y)) {
-	dy = RFLOAT_VALUE(y);
-	if (isnan(dy))
-	    return dy;
-	if (isinf(dx))
-	    return big_fdiv_float(x, y);
+        dy = RFLOAT_VALUE(y);
+        if (isnan(dy))
+            return dy;
+        if (isinf(dx))
+            return big_fdiv_float(x, y);
     }
     else {
         return NUM2DBL(rb_num_coerce_bin(x, y, idFdiv));
@@ -6247,20 +6322,19 @@ rb_big_pow(VALUE x, VALUE y)
     if (y == INT2FIX(0)) return INT2FIX(1);
     if (y == INT2FIX(1)) return x;
     if (RB_FLOAT_TYPE_P(y)) {
-	d = RFLOAT_VALUE(y);
-	if ((BIGNUM_NEGATIVE_P(x) && !BIGZEROP(x))) {
+        d = RFLOAT_VALUE(y);
+        if ((BIGNUM_NEGATIVE_P(x) && !BIGZEROP(x))) {
             return rb_dbl_complex_new_polar_pi(pow(-rb_big2dbl(x), d), d);
-	}
+        }
     }
     else if (RB_BIGNUM_TYPE_P(y)) {
-	y = bignorm(y);
-	if (FIXNUM_P(y))
-	    goto again;
-	rb_warn("in a**b, b may be too big");
-	d = rb_big2dbl(y);
+        y = bignorm(y);
+        if (FIXNUM_P(y))
+            goto again;
+        rb_raise(rb_eArgError, "exponent is too large");
     }
     else if (FIXNUM_P(y)) {
-	yy = FIX2LONG(y);
+        yy = FIX2LONG(y);
 
         if (yy < 0) {
             x = rb_big_pow(x, LONG2NUM(-yy));
@@ -6269,31 +6343,35 @@ rb_big_pow(VALUE x, VALUE y)
             else
                 return DBL2NUM(1.0 / NUM2DBL(x));
         }
-	else {
-	    VALUE z = 0;
-	    SIGNED_VALUE mask;
+        else {
+            VALUE z = 0;
+            SIGNED_VALUE mask;
             const size_t xbits = rb_absint_numwords(x, 1, NULL);
-	    const size_t BIGLEN_LIMIT = 32*1024*1024;
+#if SIZEOF_SIZE_T == 4
+            const size_t BIGLEN_LIMIT = 1ULL << 31; // 2 GB
+#else // SIZEOF_SIZE_T == 8
+            const size_t BIGLEN_LIMIT = 1ULL << 34; // 16 GB
+#endif
 
-	    if (xbits == (size_t)-1 ||
+            if (xbits == (size_t)-1 ||
                 (xbits > BIGLEN_LIMIT) ||
+                MUL_OVERFLOW_LONG_P(yy, xbits) ||
                 (xbits * yy > BIGLEN_LIMIT)) {
-		rb_warn("in a**b, b may be too big");
-		d = (double)yy;
-	    }
-	    else {
-		for (mask = FIXNUM_MAX + 1; mask; mask >>= 1) {
-		    if (z) z = bigsq(z);
-		    if (yy & mask) {
-			z = z ? bigtrunc(bigmul0(z, x)) : x;
-		    }
-		}
-		return bignorm(z);
-	    }
-	}
+                rb_raise(rb_eArgError, "exponent is too large");
+            }
+            else {
+                for (mask = FIXNUM_MAX + 1; mask; mask >>= 1) {
+                    if (z) z = bigsq(z);
+                    if (yy & mask) {
+                        z = z ? bigtrunc(bigmul0(z, x)) : x;
+                    }
+                }
+                return bignorm(z);
+            }
+        }
     }
     else {
-	return rb_num_coerce_bin(x, y, idPow);
+        return rb_num_coerce_bin(x, y, idPow);
     }
     return DBL2NUM(pow(rb_big2dbl(x), d));
 }
@@ -6308,13 +6386,13 @@ bigand_int(VALUE x, long xn, BDIGIT hibitsx, long y)
     BDIGIT hibitsy;
 
     if (y == 0) return INT2FIX(0);
-    if (xn == 0) return hibitsx ? LONG2NUM(y) : 0;
+    if (xn == 0) return hibitsx ? LONG2NUM(y) : INT2FIX(0);
     hibitsy = 0 <= y ? 0 : BDIGMAX;
     xds = BDIGITS(x);
 #if SIZEOF_BDIGIT >= SIZEOF_LONG
     if (!hibitsy) {
-	y &= xds[0];
-	return LONG2NUM(y);
+        y &= xds[0];
+        return LONG2NUM(y);
     }
 #endif
 
@@ -6343,10 +6421,10 @@ bigand_int(VALUE x, long xn, BDIGIT hibitsx, long y)
     }
 #endif
     for (;i < xn; i++) {
-	zds[i] = xds[i] & hibitsy;
+        zds[i] = xds[i] & hibitsy;
     }
     for (;i < zn; i++) {
-	zds[i] = hibitsx & hibitsy;
+        zds[i] = hibitsx & hibitsy;
     }
     twocomp2abs_bang(z, hibitsx && hibitsy);
     RB_GC_GUARD(x);
@@ -6366,12 +6444,12 @@ rb_big_and(VALUE x, VALUE y)
     long tmpn;
 
     if (!RB_INTEGER_TYPE_P(y)) {
-	return rb_num_coerce_bit(x, y, '&');
+        return rb_num_coerce_bit(x, y, '&');
     }
 
     hibitsx = abs2twocomp(&x, &xn);
     if (FIXNUM_P(y)) {
-	return bigand_int(x, xn, hibitsx, FIX2LONG(y));
+        return bigand_int(x, xn, hibitsx, FIX2LONG(y));
     }
     hibitsy = abs2twocomp(&y, &yn);
     if (xn > yn) {
@@ -6393,10 +6471,10 @@ rb_big_and(VALUE x, VALUE y)
     zds = BDIGITS(z);
 
     for (i=0; i<n1; i++) {
-	zds[i] = ds1[i] & ds2[i];
+        zds[i] = ds1[i] & ds2[i];
     }
     for (; i<n2; i++) {
-	zds[i] = hibits1 & ds2[i];
+        zds[i] = hibits1 & ds2[i];
     }
     twocomp2abs_bang(z, hibits1 && hibits2);
     RB_GC_GUARD(x);
@@ -6485,12 +6563,12 @@ rb_big_or(VALUE x, VALUE y)
     long tmpn;
 
     if (!RB_INTEGER_TYPE_P(y)) {
-	return rb_num_coerce_bit(x, y, '|');
+        return rb_num_coerce_bit(x, y, '|');
     }
 
     hibitsx = abs2twocomp(&x, &xn);
     if (FIXNUM_P(y)) {
-	return bigor_int(x, xn, hibitsx, FIX2LONG(y));
+        return bigor_int(x, xn, hibitsx, FIX2LONG(y));
     }
     hibitsy = abs2twocomp(&y, &yn);
     if (xn > yn) {
@@ -6512,10 +6590,10 @@ rb_big_or(VALUE x, VALUE y)
     zds = BDIGITS(z);
 
     for (i=0; i<n1; i++) {
-	zds[i] = ds1[i] | ds2[i];
+        zds[i] = ds1[i] | ds2[i];
     }
     for (; i<n2; i++) {
-	zds[i] = hibits1 | ds2[i];
+        zds[i] = hibits1 | ds2[i];
     }
     twocomp2abs_bang(z, hibits1 || hibits2);
     RB_GC_GUARD(x);
@@ -6579,12 +6657,12 @@ rb_big_xor(VALUE x, VALUE y)
     long tmpn;
 
     if (!RB_INTEGER_TYPE_P(y)) {
-	return rb_num_coerce_bit(x, y, '^');
+        return rb_num_coerce_bit(x, y, '^');
     }
 
     hibitsx = abs2twocomp(&x, &xn);
     if (FIXNUM_P(y)) {
-	return bigxor_int(x, xn, hibitsx, FIX2LONG(y));
+        return bigxor_int(x, xn, hibitsx, FIX2LONG(y));
     }
     hibitsy = abs2twocomp(&y, &yn);
     if (xn > yn) {
@@ -6603,10 +6681,10 @@ rb_big_xor(VALUE x, VALUE y)
     zds = BDIGITS(z);
 
     for (i=0; i<n1; i++) {
-	zds[i] = ds1[i] ^ ds2[i];
+        zds[i] = ds1[i] ^ ds2[i];
     }
     for (; i<n2; i++) {
-	zds[i] = hibitsx ^ ds2[i];
+        zds[i] = hibitsx ^ ds2[i];
     }
     twocomp2abs_bang(z, (hibits1 ^ hibits2) != 0);
     RB_GC_GUARD(x);
@@ -6622,25 +6700,25 @@ rb_big_lshift(VALUE x, VALUE y)
     int shift_numbits;
 
     for (;;) {
-	if (FIXNUM_P(y)) {
-	    long l = FIX2LONG(y);
+        if (FIXNUM_P(y)) {
+            long l = FIX2LONG(y);
             unsigned long shift;
-	    if (0 <= l) {
-		lshift_p = 1;
+            if (0 <= l) {
+                lshift_p = 1;
                 shift = l;
             }
             else {
-		lshift_p = 0;
-		shift = 1+(unsigned long)(-(l+1));
-	    }
+                lshift_p = 0;
+                shift = 1+(unsigned long)(-(l+1));
+            }
             shift_numbits = (int)(shift & (BITSPERDIG-1));
             shift_numdigits = shift >> bit_length(BITSPERDIG-1);
             return bignorm(big_shift3(x, lshift_p, shift_numdigits, shift_numbits));
-	}
-	else if (RB_BIGNUM_TYPE_P(y)) {
+        }
+        else if (RB_BIGNUM_TYPE_P(y)) {
             return bignorm(big_shift2(x, 1, y));
-	}
-	y = rb_to_int(y);
+        }
+        y = rb_to_int(y);
     }
 }
 
@@ -6652,8 +6730,8 @@ rb_big_rshift(VALUE x, VALUE y)
     int shift_numbits;
 
     for (;;) {
-	if (FIXNUM_P(y)) {
-	    long l = FIX2LONG(y);
+        if (FIXNUM_P(y)) {
+            long l = FIX2LONG(y);
             unsigned long shift;
             if (0 <= l) {
                 lshift_p = 0;
@@ -6661,16 +6739,16 @@ rb_big_rshift(VALUE x, VALUE y)
             }
             else {
                 lshift_p = 1;
-		shift = 1+(unsigned long)(-(l+1));
-	    }
+                shift = 1+(unsigned long)(-(l+1));
+            }
             shift_numbits = (int)(shift & (BITSPERDIG-1));
             shift_numdigits = shift >> bit_length(BITSPERDIG-1);
             return bignorm(big_shift3(x, lshift_p, shift_numdigits, shift_numbits));
-	}
-	else if (RB_BIGNUM_TYPE_P(y)) {
+        }
+        else if (RB_BIGNUM_TYPE_P(y)) {
             return bignorm(big_shift2(x, 0, y));
-	}
-	y = rb_to_int(y);
+        }
+        y = rb_to_int(y);
     }
 }
 
@@ -6684,22 +6762,22 @@ rb_big_aref(VALUE x, VALUE y)
     BDIGIT bit;
 
     if (RB_BIGNUM_TYPE_P(y)) {
-	if (BIGNUM_NEGATIVE_P(y))
-	    return INT2FIX(0);
-	bigtrunc(y);
-	if (BIGSIZE(y) > sizeof(size_t)) {
-	    return BIGNUM_SIGN(x) ? INT2FIX(0) : INT2FIX(1);
-	}
+        if (BIGNUM_NEGATIVE_P(y))
+            return INT2FIX(0);
+        bigtrunc(y);
+        if (BIGSIZE(y) > sizeof(size_t)) {
+            return BIGNUM_SIGN(x) ? INT2FIX(0) : INT2FIX(1);
+        }
 #if SIZEOF_SIZE_T <= SIZEOF_LONG
-	shift = big2ulong(y, "long");
+        shift = big2ulong(y, "long");
 #else
-	shift = big2ull(y, "long long");
+        shift = big2ull(y, "long long");
 #endif
     }
     else {
-	l = NUM2LONG(y);
-	if (l < 0) return INT2FIX(0);
-	shift = (size_t)l;
+        l = NUM2LONG(y);
+        if (l < 0) return INT2FIX(0);
+        shift = (size_t)l;
     }
     s1 = shift/BITSPERDIG;
     s2 = shift%BITSPERDIG;
@@ -6720,6 +6798,73 @@ rb_big_aref(VALUE x, VALUE y)
 }
 
 VALUE
+rb_big_aref2(VALUE x, VALUE beg, VALUE len)
+{
+    BDIGIT *xds, *vds;
+    VALUE v;
+    size_t copy_begin, xn, shift;
+    ssize_t begin, length, end;
+    bool negative_add_one;
+
+    beg = rb_to_int(beg);
+    len = rb_to_int(len);
+    length = NUM2SSIZET(len);
+    begin = NUM2SSIZET(beg);
+    end = NUM2SSIZET(rb_int_plus(beg, len));
+    shift = begin < 0 ? -begin : 0;
+    xn = BIGNUM_LEN(x);
+    xds = BDIGITS(x);
+
+    if (length < 0) return rb_big_rshift(x, beg);
+    if (length == 0 || end <= 0) return INT2FIX(0);
+    if (begin < 0) begin = 0;
+
+    if ((size_t)(end - 1) / BITSPERDIG >= xn) {
+        /* end > xn * BITSPERDIG */
+        end = xn * BITSPERDIG;
+    }
+
+    if ((size_t)begin / BITSPERDIG < xn) {
+        /* begin < xn * BITSPERDIG */
+        size_t shift_bits, copy_end;
+        copy_begin = begin / BITSPERDIG;
+        shift_bits = begin % BITSPERDIG;
+        copy_end = (end - 1) / BITSPERDIG + 1;
+        v = bignew(copy_end - copy_begin, 1);
+        vds = BDIGITS(v);
+        MEMCPY(vds, xds + copy_begin, BDIGIT, copy_end - copy_begin);
+        negative_add_one = (vds[0] & ((1 << shift_bits) - 1)) == 0;
+        v = bignorm(v);
+        if (shift_bits) v = rb_int_rshift(v, SIZET2NUM(shift_bits));
+    }
+    else {
+        /* Out of range */
+        v = INT2FIX(0);
+        negative_add_one = false;
+        copy_begin = begin = end = 0;
+    }
+
+    if (BIGNUM_NEGATIVE_P(x)) {
+        size_t mask_size = length - shift;
+        VALUE mask = rb_int_minus(rb_int_lshift(INT2FIX(1), SIZET2NUM(mask_size)), INT2FIX(1));
+        v = rb_int_xor(v, mask);
+        for (size_t i = 0; negative_add_one && i < copy_begin; i++) {
+            if (xds[i]) negative_add_one = false;
+        }
+        if (negative_add_one) v = rb_int_plus(v, INT2FIX(1));
+        v = rb_int_and(v, mask);
+    }
+    else {
+        size_t mask_size = (size_t)end - begin;
+        VALUE mask = rb_int_minus(rb_int_lshift(INT2FIX(1), SIZET2NUM(mask_size)), INT2FIX(1));
+        v = rb_int_and(v, mask);
+    }
+    RB_GC_GUARD(x);
+    if (shift) v = rb_int_lshift(v, SSIZET2NUM(shift));
+    return v;
+}
+
+VALUE
 rb_big_hash(VALUE x)
 {
     st_index_t hash;
@@ -6760,8 +6905,8 @@ VALUE
 rb_big_abs(VALUE x)
 {
     if (BIGNUM_NEGATIVE_P(x)) {
-	x = rb_big_clone(x);
-	BIGNUM_SET_POSITIVE_SIGN(x);
+        x = rb_big_clone(x);
+        BIGNUM_SET_POSITIVE_SIGN(x);
     }
     return x;
 }
@@ -6835,7 +6980,7 @@ VALUE
 rb_big_even_p(VALUE num)
 {
     if (BIGNUM_LEN(num) != 0 && BDIGITS(num)[0] & 1) {
-	return Qfalse;
+        return Qfalse;
     }
     return Qtrue;
 }
@@ -6853,94 +6998,36 @@ BDIGIT rb_bdigit_dbl_isqrt(BDIGIT_DBL);
 # define BDIGIT_DBL_TO_DOUBLE(n) (double)(n)
 #endif
 
-static BDIGIT *
-estimate_initial_sqrt(VALUE *xp, const size_t xn, const BDIGIT *nds, size_t len)
-{
-    enum {dbl_per_bdig = roomof(DBL_MANT_DIG,BITSPERDIG)};
-    const int zbits = nlz(nds[len-1]);
-    VALUE x = *xp = bignew_1(0, xn, 1); /* division may release the GVL */
-    BDIGIT *xds = BDIGITS(x);
-    BDIGIT_DBL d = bary2bdigitdbl(nds+len-dbl_per_bdig, dbl_per_bdig);
-    BDIGIT lowbits = 1;
-    int rshift = (int)((BITSPERDIG*2-zbits+(len&BITSPERDIG&1) - DBL_MANT_DIG + 1) & ~1);
-    double f;
-
-    if (rshift > 0) {
-	lowbits = (BDIGIT)d & ~(~(BDIGIT)1U << rshift);
-	d >>= rshift;
-    }
-    else if (rshift < 0) {
-	d <<= -rshift;
-	d |= nds[len-dbl_per_bdig-1] >> (BITSPERDIG+rshift);
-    }
-    f = sqrt(BDIGIT_DBL_TO_DOUBLE(d));
-    d = (BDIGIT_DBL)ceil(f);
-    if (BDIGIT_DBL_TO_DOUBLE(d) == f) {
-	if (lowbits || (lowbits = !bary_zero_p(nds, len-dbl_per_bdig)))
-	    ++d;
-    }
-    else {
-	lowbits = 1;
-    }
-    rshift /= 2;
-    rshift += (2-(len&1))*BITSPERDIG/2;
-    if (rshift >= 0) {
-        if (nlz((BDIGIT)d) + rshift >= BITSPERDIG) {
-            /* (d << rshift) does cause overflow.
-             * example: Integer.sqrt(0xffff_ffff_ffff_ffff ** 2)
-             */
-            d = ~(BDIGIT_DBL)0;
-        }
-        else {
-            d <<= rshift;
-        }
-    }
-    BDIGITS_ZERO(xds, xn-2);
-    bdigitdbl2bary(&xds[xn-2], 2, d);
-
-    if (!lowbits) return NULL; /* special case, exact result */
-    return xds;
-}
-
 VALUE
 rb_big_isqrt(VALUE n)
 {
     BDIGIT *nds = BDIGITS(n);
     size_t len = BIGNUM_LEN(n);
-    size_t xn = (len+1) / 2;
-    VALUE x;
-    BDIGIT *xds;
 
     if (len <= 2) {
-	BDIGIT sq = rb_bdigit_dbl_isqrt(bary2bdigitdbl(nds, len));
+        BDIGIT sq = rb_bdigit_dbl_isqrt(bary2bdigitdbl(nds, len));
 #if SIZEOF_BDIGIT > SIZEOF_LONG
-	return ULL2NUM(sq);
+        return ULL2NUM(sq);
 #else
-	return ULONG2NUM(sq);
+        return ULONG2NUM(sq);
 #endif
     }
-    else if ((xds = estimate_initial_sqrt(&x, xn, nds, len)) != 0) {
-	size_t tn = xn + BIGDIVREM_EXTRA_WORDS;
-	VALUE t = bignew_1(0, tn, 1);
-	BDIGIT *tds = BDIGITS(t);
-	tn = BIGNUM_LEN(t);
-
-	/* t = n/x */
-	while (bary_divmod_branch(tds, tn, NULL, 0, nds, len, xds, xn),
-	       bary_cmp(tds, tn, xds, xn) < 0) {
-	    int carry;
-	    BARY_TRUNC(tds, tn);
-	    /* x = (x+t)/2 */
-	    carry = bary_add(xds, xn, xds, xn, tds, tn);
-	    bary_small_rshift(xds, xds, xn, 1, carry);
-	    tn = BIGNUM_LEN(t);
-	}
-    }
-    RBASIC_SET_CLASS_RAW(x, rb_cInteger);
-    return x;
+    else {
+        size_t shift = FIX2LONG(rb_big_bit_length(n)) / 4;
+        VALUE n2 = rb_int_rshift(n, SIZET2NUM(2 * shift));
+        VALUE x = FIXNUM_P(n2) ? LONG2FIX(rb_ulong_isqrt(FIX2ULONG(n2))) : rb_big_isqrt(n2);
+        /* x = (x+n/x)/2 */
+        x = rb_int_plus(rb_int_lshift(x, SIZET2NUM(shift - 1)), rb_int_idiv(rb_int_rshift(n, SIZET2NUM(shift + 1)), x));
+        VALUE xx = rb_int_mul(x, x);
+        while (rb_int_gt(xx, n)) {
+            xx = rb_int_minus(xx, rb_int_minus(rb_int_plus(x, x), INT2FIX(1)));
+            x = rb_int_minus(x, INT2FIX(1));
+        }
+        return x;
+    }
 }
 
-#ifdef USE_GMP
+#if USE_GMP
 static void
 bary_powm_gmp(BDIGIT *zds, size_t zn, const BDIGIT *xds, size_t xn, const BDIGIT *yds, size_t yn, const BDIGIT *mds, size_t mn)
 {
@@ -6966,7 +7053,7 @@ bary_powm_gmp(BDIGIT *zds, size_t zn, const BDIGIT *xds, size_t xn, const BDIGIT
 static VALUE
 int_pow_tmp3(VALUE x, VALUE y, VALUE m, int nega_flg)
 {
-#ifdef USE_GMP
+#if USE_GMP
     VALUE z;
     size_t xn, yn, mn, zn;
 
@@ -6976,14 +7063,14 @@ int_pow_tmp3(VALUE x, VALUE y, VALUE m, int nega_flg)
     if (FIXNUM_P(y)) {
        y = rb_int2big(FIX2LONG(y));
     }
-    assert(RB_BIGNUM_TYPE_P(m));
+    RUBY_ASSERT(RB_BIGNUM_TYPE_P(m));
     xn = BIGNUM_LEN(x);
     yn = BIGNUM_LEN(y);
     mn = BIGNUM_LEN(m);
     zn = mn;
     z = bignew(zn, 1);
     bary_powm_gmp(BDIGITS(z), zn, BDIGITS(x), xn, BDIGITS(y), yn, BDIGITS(m), mn);
-    if (nega_flg & BIGNUM_POSITIVE_P(z)) {
+    if (nega_flg && BIGNUM_POSITIVE_P(z) && !BIGZEROP(z)) {
         z = rb_big_minus(z, m);
     }
     RB_GC_GUARD(x);
@@ -7011,7 +7098,7 @@ int_pow_tmp3(VALUE x, VALUE y, VALUE m, int nega_flg)
         x = rb_int_modulo(x, m);
     }
 
-    if (nega_flg && rb_int_positive_p(tmp)) {
+    if (nega_flg && rb_int_positive_p(tmp) && !rb_int_zero_p(tmp)) {
         tmp = rb_int_minus(tmp, m);
     }
     return tmp;
@@ -7123,6 +7210,11 @@ rb_int_powm(int const argc, VALUE * const argv, VALUE const num)
             rb_raise(rb_eTypeError, "Integer#pow() 2nd argument not allowed unless all arguments are integers");
         }
 
+        if (rb_int_zero_p(a) && !rb_int_zero_p(b)) {
+            /* shortcut; 0**x => 0 except for x == 0 */
+            return INT2FIX(0);
+        }
+
         if (rb_int_negative_p(m)) {
             m = rb_int_uminus(m);
             nega_flg = 1;
@@ -7142,7 +7234,7 @@ rb_int_powm(int const argc, VALUE * const argv, VALUE const num)
         }
         else {
             if (rb_bigzero_p(m)) rb_num_zerodiv();
-	    if (bignorm(m) == INT2FIX(1)) return INT2FIX(0);
+            if (bignorm(m) == INT2FIX(1)) return INT2FIX(0);
             return int_pow_tmp3(rb_int_modulo(a, m), b, m, nega_flg);
         }
     }
@@ -7172,7 +7264,7 @@ Init_Bignum(void)
 {
     rb_define_method(rb_cInteger, "coerce", rb_int_coerce, 1);
 
-#ifdef USE_GMP
+#if USE_GMP
     /* The version of loaded GMP. */
     rb_define_const(rb_cInteger, "GMP_VERSION", rb_sprintf("GMP %s", gmp_version));
 #endif
diff --git a/bin/gem b/bin/gem
index a4ec754abb..3ac1d9e623 100755
--- a/bin/gem
+++ b/bin/gem
@@ -1,25 +1,12 @@
 #!/usr/bin/env ruby
+# frozen_string_literal: true
+
 #--
 # Copyright 2006 by Chad Fowler, Rich Kilmer, Jim Weirich and others.
 # All rights reserved.
 # See LICENSE.txt for permissions.
 #++
 
-require 'rubygems'
-require 'rubygems/gem_runner'
-require 'rubygems/exceptions'
-
-required_version = Gem::Requirement.new ">= 1.8.7"
-
-unless required_version.satisfied_by? Gem.ruby_version then
-  abort "Expected Ruby Version #{required_version}, is #{Gem.ruby_version}"
-end
-
-args = ARGV.clone
-
-begin
-  Gem::GemRunner.new.run args
-rescue Gem::SystemExitException => e
-  exit e.exit_code
-end
+require "rubygems/gem_runner"
 
+Gem::GemRunner.new.run ARGV.clone
diff --git a/bootstraptest/runner.rb b/bootstraptest/runner.rb
index 3d42390254..04de0c93b9 100755
--- a/bootstraptest/runner.rb
+++ b/bootstraptest/runner.rb
@@ -6,7 +6,6 @@
 # Never use optparse in this file.
 # Never use test/unit in this file.
 # Never use Ruby extensions in this file.
-# Maintain Ruby 1.8 compatibility for now
 
 $start_time = Time.now
 
@@ -17,6 +16,7 @@ rescue LoadError
   $:.unshift File.join(File.dirname(__FILE__), '../lib')
   retry
 end
+require_relative '../tool/lib/test/jobserver'
 
 if !Dir.respond_to?(:mktmpdir)
   # copied from lib/tmpdir.rb
@@ -61,7 +61,7 @@ if !Dir.respond_to?(:mktmpdir)
 end
 
 # Configuration
-BT = Struct.new(:ruby,
+bt = Struct.new(:ruby,
                 :verbose,
                 :color,
                 :tty,
@@ -73,9 +73,57 @@ BT = Struct.new(:ruby,
                 :failed,
                 :reset,
                 :columns,
+                :window_width,
                 :width,
+                :indent,
                 :platform,
-                ).new
+                :timeout,
+                :timeout_scale,
+                :launchable_test_reports
+                )
+BT = Class.new(bt) do
+  def indent=(n)
+    super
+    if (self.columns ||= 0) < n
+      $stderr.print(' ' * (n - self.columns))
+    end
+    self.columns = indent
+  end
+
+  def putc(c)
+    unless self.quiet
+      if self.window_width == nil
+        unless w = ENV["COLUMNS"] and (w = w.to_i) > 0
+          w = 80
+        end
+        w -= 1
+        self.window_width = w
+      end
+      if self.window_width and self.columns >= self.window_width
+        $stderr.print "\n", " " * (self.indent ||= 0)
+        self.columns = indent
+      end
+      $stderr.print c
+      $stderr.flush
+      self.columns += 1
+    end
+  end
+
+  def wn=(wn)
+    unless wn == 1
+      wn = Test::JobServer.max_jobs(wn > 0 ? wn : 1024, ENV.delete("MAKEFLAGS")) || wn
+      if wn <= 0
+        require 'etc'
+        wn = [Etc.nprocessors / 2, 1].max
+      end
+    end
+    super wn
+  end
+
+  def apply_timeout_scale(timeout)
+    timeout&.*(timeout_scale)
+  end
+end.new
 
 BT_STATE = Struct.new(:count, :error).new
 
@@ -87,7 +135,13 @@ def main
   BT.color = nil
   BT.tty = nil
   BT.quiet = false
-  BT.wn = 1
+  BT.timeout = 180
+  BT.timeout_scale = 1
+  if (ts = (ENV["RUBY_TEST_TIMEOUT_SCALE"] || ENV["RUBY_TEST_SUBPROCESS_TIMEOUT_SCALE"]).to_i) > 1
+    BT.timeout_scale *= ts
+  end
+
+  # BT.wn = 1
   dir = nil
   quiet = false
   tests = nil
@@ -117,19 +171,18 @@ def main
       warn "unknown --tty argument: #$3" if $3
       BT.tty = !$1 || !$2
       true
-    when /\A(-q|--q(uiet))\z/
+    when /\A(-q|--q(uiet)?)\z/
       quiet = true
       BT.quiet = true
       true
     when /\A-j(\d+)?/
-      wn = $1.to_i
-      if wn <= 0
-        require 'etc'
-        wn = [Etc.nprocessors / 2, 1].max
-      end
-      BT.wn = wn
+      BT.wn = $1.to_i
       true
-    when /\A(-v|--v(erbose))\z/
+    when /\A--timeout=(\d+(?:_\d+)*(?:\.\d+(?:_\d+)*)?)(?::(\d+(?:_\d+)*(?:\.\d+(?:_\d+)*)?))?/
+      BT.timeout = $1.to_f
+      BT.timeout_scale = $2.to_f if defined?($2)
+      true
+    when /\A(-v|--v(erbose)?)\z/
       BT.verbose = true
       BT.quiet = false
       true
@@ -141,6 +194,7 @@ Usage: #{File.basename($0, '.*')} --ruby=PATH [--sets=NAME,NAME,...]
                                     default: /tmp/bootstraptestXXXXX.tmpwd
         --color[=WHEN]              Colorize the output.  WHEN defaults to 'always'
                                     or can be 'never' or 'auto'.
+        --timeout=TIMEOUT           Default timeout in seconds.
     -s, --stress                    stress test.
     -v, --verbose                   Output test name before exec.
     -q, --quiet                     Don\'t print header message.
@@ -149,21 +203,46 @@ End
       exit true
     when /\A-j/
       true
+    when /--launchable-test-reports=(.*)/
+      if File.exist?($1)
+        # To protect files from overwritten, do nothing when the file exists.
+        return true
+      end
+
+      begin
+        require_relative '../tool/lib/launchable'
+      rescue LoadError
+        # The following error sometimes happens, so we're going to skip writing Launchable report files in this case.
+        #
+        # ```
+        # /tmp/tmp.bISss9CtXZ/.ext/common/json/ext.rb:15:in 'Kernel#require':
+        #   /tmp/tmp.bISss9CtXZ/.ext/x86_64-linux/json/ext/parser.so:
+        #     undefined symbol: ruby_abi_version - ruby_abi_version (LoadError)
+        # ```
+        #
+        return true
+      end
+      BT.launchable_test_reports = writer = Launchable::JsonStreamWriter.new($1)
+      writer.write_array('testCases')
+      at_exit {
+        writer.close
+      }
+      true
     else
       false
     end
   }
   if tests and not ARGV.empty?
-    $stderr.puts "--tests and arguments are exclusive"
-    exit false
+    abort "--sets and arguments are exclusive"
   end
   tests ||= ARGV
   tests = Dir.glob("#{File.dirname($0)}/test_*.rb").sort if tests.empty?
-  pathes = tests.map {|path| File.expand_path(path) }
+  paths = tests.map {|path| File.expand_path(path) }
 
   BT.progress = %w[- \\ | /]
   BT.progress_bs = "\b" * BT.progress[0].size
   BT.tty = $stderr.tty? if BT.tty.nil?
+  BT.wn ||= /-j(\d+)?/ =~ (ENV["MAKEFLAGS"] || ENV["MFLAGS"]) ? $1.to_i : 1
 
   case BT.color
   when nil
@@ -192,7 +271,7 @@ End
     if defined?(RUBY_DESCRIPTION)
       puts "Driver is #{RUBY_DESCRIPTION}"
     elsif defined?(RUBY_PATCHLEVEL)
-      puts "Driver is ruby #{RUBY_VERSION} (#{RUBY_RELEASE_DATE}#{RUBY_PLATFORM}) [#{RUBY_PLATFORM}]"
+      puts "Driver is ruby #{RUBY_VERSION} (#{RUBY_RELEASE_DATE}#{RUBY_PATCHLEVEL}) [#{RUBY_PLATFORM}]"
     else
       puts "Driver is ruby #{RUBY_VERSION} (#{RUBY_RELEASE_DATE}) [#{RUBY_PLATFORM}]"
     end
@@ -202,7 +281,7 @@ End
   end
 
   in_temporary_working_directory(dir) do
-    exec_test pathes
+    exec_test paths
   end
 end
 
@@ -214,8 +293,8 @@ def erase(e = true)
   end
 end
 
-def load_test pathes
-  pathes.each do |path|
+def load_test paths
+  paths.each do |path|
     load File.expand_path(path)
   end
 end
@@ -241,19 +320,20 @@ def concurrent_exec_test
     end
   end
 
-  $stderr.print ' ' unless BT.quiet
+  BT.indent = 1
   aq.close
   i = 1
   term_wn = 0
   begin
     while BT.wn != term_wn
       if r = rq.pop
+        BT_STATE.count += 1
         case
         when BT.quiet
         when BT.tty
           $stderr.print "#{BT.progress_bs}#{BT.progress[(i+=1) % BT.progress.size]}"
         else
-          $stderr.print '.'
+          BT.putc '.'
         end
       else
         term_wn += 1
@@ -265,17 +345,70 @@ def concurrent_exec_test
   end
 end
 
-def exec_test(pathes)
+##
+# Module for writing a test file for uploading test results into Launchable.
+# In bootstraptest, we aggregate the test results based on file level.
+module Launchable
+  @@last_test_name = nil
+  @@failure_log = ''
+  @@duration = 0
+
+  def show_progress(message = '')
+    faildesc, t = super
+
+    if writer = BT.launchable_test_reports
+      if faildesc
+        @@failure_log += faildesc
+      end
+      repo_path = File.expand_path("#{__dir__}/../")
+      relative_path = File.join(__dir__, self.path).delete_prefix("#{repo_path}/")
+      if @@last_test_name != nil && @@last_test_name != relative_path
+        # The test path is a URL-encoded representation.
+        # https://github.com/launchableinc/cli/blob/v1.81.0/launchable/testpath.py#L18
+        test_path = "#{encode_test_path_component("file")}=#{encode_test_path_component(@@last_test_name)}"
+        if @@failure_log.size > 0
+          status = 'TEST_FAILED'
+        else
+          status = 'TEST_PASSED'
+        end
+        writer.write_object(
+          {
+            testPath: test_path,
+            status: status,
+            duration: t,
+            createdAt: Time.now.to_s,
+            stderr: @@failure_log,
+            stdout: nil,
+            data: {
+              lineNumber: self.lineno
+            }
+          }
+        )
+        @@duration = 0
+        @@failure_log = ''
+      end
+      @@last_test_name = relative_path
+      @@duration += t
+    end
+  end
+
+  private
+  def encode_test_path_component component
+    component.to_s.gsub('%', '%25').gsub('=', '%3D').gsub('#', '%23').gsub('&', '%26')
+  end
+end
+
+def exec_test(paths)
   # setup
-  load_test pathes
+  load_test paths
   BT_STATE.count = 0
   BT_STATE.error = 0
   BT.columns = 0
-  BT.width = pathes.map {|path| File.basename(path).size}.max + 2
+  BT.width = paths.map {|path| File.basename(path).size}.max + 2
 
   # execute tests
   if BT.wn > 1
-    concurrent_exec_test if BT.wn > 1
+    concurrent_exec_test
   else
     prev_basename = nil
     Assertion.all.each do |basename, assertions|
@@ -341,6 +474,7 @@ def target_platform
 end
 
 class Assertion < Struct.new(:src, :path, :lineno, :proc)
+  prepend Launchable
   @count = 0
   @all = Hash.new{|h, k| h[k] = []}
   @errbuf = []
@@ -364,7 +498,7 @@ class Assertion < Struct.new(:src, :path, :lineno, :proc)
   def initialize(*args)
     super
     self.class.add self
-    @category = self.path.match(/test_(.+)\.rb/)[1]
+    @category = self.path[/\Atest_(.+)\.rb\z/, 1]
   end
 
   def call
@@ -415,9 +549,9 @@ class Assertion < Struct.new(:src, :path, :lineno, :proc)
       $stderr.print "#{BT.progress_bs}#{BT.progress[BT_STATE.count % BT.progress.size]}"
     end
 
-    t = Time.now if BT.verbose
+    t = Time.now if BT.verbose || BT.launchable_test_reports
     faildesc, errout = with_stderr {yield}
-    t = Time.now - t if BT.verbose
+    t = Time.now - t if BT.verbose || BT.launchable_test_reports
 
     if !faildesc
       # success
@@ -428,7 +562,7 @@ class Assertion < Struct.new(:src, :path, :lineno, :proc)
       elsif BT.verbose
         $stderr.printf(". %.3f\n", t)
       else
-        $stderr.print '.'
+        BT.putc '.'
       end
     else
       $stderr.print "#{BT.failed}F"
@@ -444,6 +578,8 @@ class Assertion < Struct.new(:src, :path, :lineno, :proc)
         $stderr.printf("%-*s%s", BT.width, path, BT.progress[BT_STATE.count % BT.progress.size])
       end
     end
+
+    [faildesc, t]
   rescue Interrupt
     $stderr.puts "\##{@id} #{path}:#{lineno}"
     raise
@@ -462,14 +598,22 @@ class Assertion < Struct.new(:src, :path, :lineno, :proc)
     end
   end
 
-  def get_result_string(opt = '', **argh)
+  class Timeout < StandardError; end
+
+  def get_result_string(opt = '', timeout: BT.timeout, **argh)
     if BT.ruby
+      timeout = BT.apply_timeout_scale(timeout)
       filename = make_srcfile(**argh)
       begin
         kw = self.err ? {err: self.err} : {}
         out = IO.popen("#{BT.ruby} -W0 #{opt} #{filename}", **kw)
         pid = out.pid
-        out.read.tap{ Process.waitpid(pid); out.close }
+        th = Thread.new {out.read.tap {Process.waitpid(pid); out.close}}
+        if th.join(timeout)
+          th.value
+        else
+          Timeout.new("timed out after #{timeout} seconds")
+        end
       ensure
         raise Interrupt if $? and $?.signaled? && $?.termsig == Signal.list["INT"]
 
@@ -487,9 +631,14 @@ class Assertion < Struct.new(:src, :path, :lineno, :proc)
   def make_srcfile(frozen_string_literal: nil)
     filename = "bootstraptest.#{self.path}_#{self.lineno}_#{self.id}.rb"
     File.open(filename, 'w') {|f|
-      f.puts "#frozen_string_literal:true" if frozen_string_literal
-      f.puts "GC.stress = true" if $stress
-      f.puts "print(begin; #{self.src}; end)"
+      f.puts "#frozen_string_literal:#{frozen_string_literal}" unless frozen_string_literal.nil?
+      if $stress
+        f.puts "GC.stress = true" if $stress
+      else
+        f.puts ""
+      end
+      f.puts "class BT_Skip < Exception; end; def skip(msg) = raise(BT_Skip, msg.to_s)"
+      f.puts "print(begin; #{self.src}; rescue BT_Skip; $!.message; end)"
     }
     filename
   end
@@ -503,9 +652,9 @@ def add_assertion src, pr
   Assertion.new(src, path, lineno, pr)
 end
 
-def assert_equal(expected, testsrc, message = '', opt = '', **argh)
+def assert_equal(expected, testsrc, message = '', opt = '', **kwargs)
   add_assertion testsrc, -> as do
-    as.assert_check(message, opt, **argh) {|result|
+    as.assert_check(message, opt, **kwargs) {|result|
       if expected == result
         nil
       else
@@ -516,9 +665,9 @@ def assert_equal(expected, testsrc, message = '', opt = '', **argh)
   end
 end
 
-def assert_match(expected_pattern, testsrc, message = '')
+def assert_match(expected_pattern, testsrc, message = '', **argh)
   add_assertion testsrc, -> as do
-    as.assert_check(message) {|result|
+    as.assert_check(message, **argh) {|result|
       if expected_pattern =~ result
         nil
       else
@@ -550,8 +699,9 @@ def assert_valid_syntax(testsrc, message = '')
   end
 end
 
-def assert_normal_exit(testsrc, *rest, timeout: nil, **opt)
+def assert_normal_exit(testsrc, *rest, timeout: BT.timeout, **opt)
   add_assertion testsrc, -> as do
+    timeout = BT.apply_timeout_scale(timeout)
     message, ignore_signals = rest
     message ||= ''
     as.show_progress(message) {
@@ -560,23 +710,19 @@ def assert_normal_exit(testsrc, *rest, timeout: nil, **opt)
       timeout_signaled = false
       logfile = "assert_normal_exit.#{as.path}.#{as.lineno}.log"
 
-      begin
-        err = open(logfile, "w")
-        io = IO.popen("#{BT.ruby} -W0 #{filename}", err: err)
-        pid = io.pid
-        th = Thread.new {
-          io.read
-          io.close
-          $?
-        }
-        if !th.join(timeout)
-          Process.kill :KILL, pid
-          timeout_signaled = true
-        end
-        status = th.value
-      ensure
-        err.close
+      io = IO.popen("#{BT.ruby} -W0 #{filename}", err: logfile)
+      pid = io.pid
+      th = Thread.new {
+        io.read
+        io.close
+        $?
+      }
+      if !th.join(timeout)
+        Process.kill :KILL, pid
+        timeout_signaled = true
       end
+      status = th.value
+
       if status && status.signaled?
         signo = status.termsig
         signame = Signal.list.invert[signo]
@@ -605,9 +751,7 @@ end
 
 def assert_finish(timeout_seconds, testsrc, message = '')
   add_assertion testsrc, -> as do
-    if defined?(RubyVM::MJIT) && RubyVM::MJIT.enabled? # for --jit-wait
-      timeout_seconds *= 3
-    end
+    timeout_seconds = BT.apply_timeout_scale(timeout_seconds)
 
     as.show_progress(message) {
       faildesc = nil
@@ -663,6 +807,8 @@ end
 
 def pretty(src, desc, result)
   src = src.sub(/\A\s*\n/, '')
+  lines = src.lines
+  src = lines[0..20].join + "(...snip)\n" if lines.size > 20
   (/\n/ =~ src ? "\n#{adjust_indent(src)}" : src) + "  #=> #{desc}"
 end
 
@@ -720,4 +866,12 @@ def check_coredump
   end
 end
 
+def yjit_enabled?
+  ENV.key?('RUBY_YJIT_ENABLE') || ENV.fetch('RUN_OPTS', '').include?('yjit') || BT.ruby.include?('yjit')
+end
+
+def zjit_enabled?
+  ENV.key?('RUBY_ZJIT_ENABLE') || ENV.fetch('RUN_OPTS', '').include?('zjit') || BT.ruby.include?('zjit')
+end
+
 exit main
diff --git a/bootstraptest/test_attr.rb b/bootstraptest/test_attr.rb
index 721a847145..3cb9d3eb39 100644
--- a/bootstraptest/test_attr.rb
+++ b/bootstraptest/test_attr.rb
@@ -34,3 +34,19 @@ assert_equal %{ok}, %{
     print "ok"
   end
 }, '[ruby-core:15120]'
+
+assert_equal %{ok}, %{
+  class Big
+    attr_reader :foo
+    def initialize
+      @foo = "ok"
+    end
+  end
+
+  obj = Big.new
+  100.times do |i|
+    obj.instance_variable_set(:"@ivar_\#{i}", i)
+  end
+
+  Big.new.foo
+}
diff --git a/bootstraptest/test_autoload.rb b/bootstraptest/test_autoload.rb
index 9e0850bc52..de66f1f3ee 100644
--- a/bootstraptest/test_autoload.rb
+++ b/bootstraptest/test_autoload.rb
@@ -11,7 +11,7 @@ assert_equal 'ok', %q{
 }, '[ruby-dev:43816]'
 
 assert_equal 'ok', %q{
-  open('zzz2.rb', 'w') {|f| f.puts '' }
+  File.write('zzz2.rb', '')
   instance_eval do
     autoload :ZZZ, './zzz2.rb'
     begin
@@ -23,7 +23,7 @@ assert_equal 'ok', %q{
 }, '[ruby-dev:43816]'
 
 assert_equal 'ok', %q{
-  open('zzz3.rb', 'w') {|f| f.puts 'class ZZZ; def self.ok;:ok;end;end'}
+  File.write('zzz3.rb', "class ZZZ; def self.ok;:ok;end;end\n")
   instance_eval do
     autoload :ZZZ, './zzz3.rb'
     ZZZ.ok
@@ -31,20 +31,20 @@ assert_equal 'ok', %q{
 }, '[ruby-dev:43816]'
 
 assert_equal 'ok', %q{
-  open("zzz4.rb", "w") {|f| f.puts "class ZZZ; def self.ok;:ok;end;end"}
+  File.write("zzz4.rb", "class ZZZ; def self.ok;:ok;end;end\n")
   autoload :ZZZ, "./zzz4.rb"
   ZZZ.ok
 }
 
 assert_equal 'ok', %q{
-  open("zzz5.rb", "w") {|f| f.puts "class ZZZ; def self.ok;:ok;end;end"}
+  File.write("zzz5.rb", "class ZZZ; def self.ok;:ok;end;end\n")
   autoload :ZZZ, "./zzz5.rb"
   require "./zzz5.rb"
   ZZZ.ok
 }
 
 assert_equal 'okok', %q{
-  open("zzz6.rb", "w") {|f| f.puts "class ZZZ; def self.ok;:ok;end;end"}
+  File.write("zzz6.rb", "class ZZZ; def self.ok;:ok;end;end\n")
   autoload :ZZZ, "./zzz6.rb"
   t1 = Thread.new {ZZZ.ok}
   t2 = Thread.new {ZZZ.ok}
@@ -60,7 +60,7 @@ assert_finish 5, %q{
 }, '[ruby-core:21696]'
 
 assert_equal 'A::C', %q{
-  open("zzz7.rb", "w") {}
+  File.write("zzz7.rb", "")
   class A
     autoload :C, "./zzz7"
     class C
diff --git a/bootstraptest/test_eval.rb b/bootstraptest/test_eval.rb
index a9f389c673..20bd9615f4 100644
--- a/bootstraptest/test_eval.rb
+++ b/bootstraptest/test_eval.rb
@@ -217,7 +217,7 @@ assert_equal %q{[10, main]}, %q{
 }
 
 %w[break next redo].each do |keyword|
-  assert_match %r"Can't escape from eval with #{keyword}\b", %{
+  assert_match %r"Invalid #{keyword}\b", %{
     $stderr = STDOUT
     begin
       eval "0 rescue #{keyword}"
@@ -227,6 +227,16 @@ assert_equal %q{[10, main]}, %q{
   }, '[ruby-dev:31372]'
 end
 
+assert_normal_exit %{
+  $stderr = STDOUT
+  5000.times do
+    begin
+      eval "0 rescue break"
+    rescue SyntaxError
+    end
+  end
+}
+
 assert_normal_exit %q{
   $stderr = STDOUT
   class Foo
@@ -354,3 +364,34 @@ assert_normal_exit %q{
   end
 }, 'check escaping the internal value th->base_block'
 
+assert_equal "false", <<~RUBY, "literal strings are mutable", "--disable-frozen-string-literal"
+  eval("'test'").frozen?
+RUBY
+
+assert_equal "false", <<~RUBY, "literal strings are mutable", "--disable-frozen-string-literal", frozen_string_literal: true
+  eval("'test'").frozen?
+RUBY
+
+assert_equal "true", <<~RUBY, "literal strings are frozen", "--enable-frozen-string-literal"
+  eval("'test'").frozen?
+RUBY
+
+assert_equal "true", <<~RUBY, "literal strings are frozen", "--enable-frozen-string-literal", frozen_string_literal: false
+  eval("'test'").frozen?
+RUBY
+
+assert_equal "false", <<~RUBY, "__FILE__ is mutable", "--disable-frozen-string-literal"
+  eval("__FILE__").frozen?
+RUBY
+
+assert_equal "false", <<~RUBY, "__FILE__ is mutable", "--disable-frozen-string-literal", frozen_string_literal: true
+  eval("__FILE__").frozen?
+RUBY
+
+assert_equal "true", <<~RUBY, "__FILE__ is frozen", "--enable-frozen-string-literal"
+  eval("__FILE__").frozen?
+RUBY
+
+assert_equal "true", <<~RUBY, "__FILE__ is frozen", "--enable-frozen-string-literal", frozen_string_literal: false
+  eval("__FILE__").frozen?
+RUBY
diff --git a/bootstraptest/test_exception.rb b/bootstraptest/test_exception.rb
index 0fb6f552b8..decfdc08a3 100644
--- a/bootstraptest/test_exception.rb
+++ b/bootstraptest/test_exception.rb
@@ -370,7 +370,7 @@ assert_equal %q{}, %q{
 }
 
 ##
-assert_match /undefined method `foo\'/, %q{#`
+assert_match /undefined method 'foo\'/, %q{#`
   STDERR.reopen(STDOUT)
   class C
     def inspect
diff --git a/bootstraptest/test_fiber.rb b/bootstraptest/test_fiber.rb
index 2614dd13bf..ae809a5936 100644
--- a/bootstraptest/test_fiber.rb
+++ b/bootstraptest/test_fiber.rb
@@ -37,3 +37,8 @@ assert_normal_exit %q{
 assert_normal_exit %q{
   Fiber.new(&Object.method(:class_eval)).resume("foo")
 }, '[ruby-dev:34128]'
+
+# [Bug #21400]
+assert_normal_exit %q{
+  Thread.new { Fiber.current.kill }.join
+}
diff --git a/bootstraptest/test_finalizer.rb b/bootstraptest/test_finalizer.rb
index 22a16b1220..ccfa0b55d6 100644
--- a/bootstraptest/test_finalizer.rb
+++ b/bootstraptest/test_finalizer.rb
@@ -6,3 +6,11 @@ ObjectSpace.define_finalizer(b1,proc{b1.inspect})
 ObjectSpace.define_finalizer(a2,proc{a1.inspect})
 ObjectSpace.define_finalizer(a1,proc{})
 }, '[ruby-dev:35778]'
+
+assert_equal 'true', %q{
+  obj = Object.new
+  id = obj.object_id
+
+  ObjectSpace.define_finalizer(obj, proc { |i| print(id == i) })
+  nil
+}
diff --git a/bootstraptest/test_flow.rb b/bootstraptest/test_flow.rb
index 35f19db588..15528a4213 100644
--- a/bootstraptest/test_flow.rb
+++ b/bootstraptest/test_flow.rb
@@ -363,7 +363,7 @@ assert_equal %q{[1, 2, 3, 5, 2, 3, 5, 7, 8]}, %q{$a = []; begin;  ; $a << 1
 ; $a << 8
 ; rescue Exception; $a << 99; end; $a}
 assert_equal %q{[1, 2, 6, 3, 5, 7, 8]}, %q{$a = []; begin;  ; $a << 1
-  o = "test"; $a << 2
+  o = "test".dup; $a << 2
   def o.test(a); $a << 3
     return a; $a << 4
   ensure; $a << 5
diff --git a/bootstraptest/test_fork.rb b/bootstraptest/test_fork.rb
index 83923dad97..860ef285d0 100644
--- a/bootstraptest/test_fork.rb
+++ b/bootstraptest/test_fork.rb
@@ -75,3 +75,30 @@ assert_equal '[1, 2]', %q{
   end
 }, '[ruby-dev:44005] [Ruby 1.9 - Bug #4950]'
 
+assert_equal 'ok', %q{
+  def now = Process.clock_gettime(Process::CLOCK_MONOTONIC)
+
+  Thread.new do
+    loop { sleep 0.0001 }
+  end
+
+  10.times do
+    pid = fork{ exit!(0) }
+    deadline = now + 10
+    while true
+      _, status = Process.waitpid2(pid, Process::WNOHANG)
+      break if status
+      if now > deadline
+        Process.kill(:KILL, pid)
+        raise "failed"
+      end
+      sleep 0.001
+    end
+    unless status.success?
+      raise "child exited with status #{status}"
+    end
+  rescue NotImplementedError
+  end
+  :ok
+}, '[Bug #20670]'
+
diff --git a/bootstraptest/test_insns.rb b/bootstraptest/test_insns.rb
index 91fba9b011..9e2c4a52a7 100644
--- a/bootstraptest/test_insns.rb
+++ b/bootstraptest/test_insns.rb
@@ -92,7 +92,7 @@ tests = [
   [ 'intern',                   %q{ :"#{true}" }, ],
 
   [ 'newarray',    %q{ ["true"][0] }, ],
-  [ 'newarraykwsplat', %q{ [**{x:'true'}][0][:x] }, ],
+  [ 'pushtoarraykwsplat', %q{ [**{x:'true'}][0][:x] }, ],
   [ 'duparray',    %q{ [ true ][0] }, ],
   [ 'expandarray', %q{ y = [ true, false, nil ]; x, = y; x }, ],
   [ 'expandarray', %q{ y = [ true, false, nil ]; x, *z = y; x }, ],
@@ -214,9 +214,24 @@ tests = [
     'true'.freeze
   },
 
-  [ 'opt_newarray_max', %q{ [ ].max.nil? }, ],
-  [ 'opt_newarray_max', %q{ [1, x = 2, 3].max == 3 }, ],
-  [ 'opt_newarray_max', <<-'},', ], # {
+  [ 'opt_duparray_send', %q{ x = :a; [:a, :b].include?(x) }, ],
+  [ 'opt_duparray_send', <<-'},', ], # {
+    class Array
+      def include?(i)
+        i == 1
+      end
+    end
+    x = 1
+    [:a, :b].include?(x)
+  },
+
+  [ 'opt_newarray_send', %q{ ![ ].hash.nil? }, ],
+
+  [ 'opt_newarray_send', %q{ v=2; [1, Object.new, 2].include?(v) }, ],
+
+  [ 'opt_newarray_send', %q{ [ ].max.nil? }, ],
+  [ 'opt_newarray_send', %q{ [1, x = 2, 3].max == 3 }, ],
+  [ 'opt_newarray_send', <<-'},', ], # {
     class Array
       def max
         true
@@ -224,9 +239,9 @@ tests = [
     end
     [1, x = 2, 3].max
   },
-  [ 'opt_newarray_min', %q{ [ ].min.nil? }, ],
-  [ 'opt_newarray_min', %q{ [3, x = 2, 1].min == 1 }, ],
-  [ 'opt_newarray_min', <<-'},', ], # {
+  [ 'opt_newarray_send', %q{ [ ].min.nil? }, ],
+  [ 'opt_newarray_send', %q{ [3, x = 2, 1].min == 1 }, ],
+  [ 'opt_newarray_send', <<-'},', ], # {
     class Array
       def min
         true
@@ -234,6 +249,48 @@ tests = [
     end
     [3, x = 2, 1].min
   },
+  [ 'opt_newarray_send', %q{ v = 1.23; [v, v*2].pack("E*").unpack("E*") == [v, v*2] }, ],
+  [ 'opt_newarray_send', %q{ v = 4.56; b = +"x"; [v, v*2].pack("E*", buffer: b); b[1..].unpack("E*") == [v, v*2] }, ],
+  [ 'opt_newarray_send', <<-'},', ], # {
+    v = 7.89;
+    b = +"x";
+    class Array
+      alias _pack pack
+      def pack(s, buffer: nil, prefix: "y")
+        buffer ||= +"b"
+        buffer << prefix
+        _pack(s, buffer: buffer)
+      end
+    end
+    tests = []
+
+    ret = [v].pack("E*", prefix: "z")
+    tests << (ret[0..1] == "bz")
+    tests << (ret[2..].unpack("E*") == [v])
+
+    ret = [v].pack("E*")
+    tests << (ret[0..1] == "by")
+    tests << (ret[2..].unpack("E*") == [v])
+
+    [v, v*2, v*3].pack("E*", buffer: b)
+    tests << (b[0..1] == "xy")
+    tests << (b[2..].unpack("E*") == [v, v*2, v*3])
+
+    class Array
+      def pack(_fmt, buffer:) = buffer
+    end
+
+    b = nil
+    tests << [v].pack("E*", buffer: b).nil?
+
+    class Array
+      def pack(_fmt, **kw) = kw.empty?
+    end
+
+    tests << [v].pack("E*") == true
+
+    tests.all? or puts tests
+  },
 
   [ 'throw',        %q{ false.tap { break true } }, ],
   [ 'branchif',     %q{ x = nil;  x ||= true }, ],
@@ -352,7 +409,7 @@ tests = [
   [ 'opt_ge', %q{ +0.0.next_float >= 0.0 }, ],
   [ 'opt_ge', %q{              ?z >= ?a }, ],
 
-  [ 'opt_ltlt', %q{  '' << 'true' }, ],
+  [ 'opt_ltlt', %q{  +'' << 'true' }, ],
   [ 'opt_ltlt', %q{ ([] << 'true').join }, ],
   [ 'opt_ltlt', %q{ (1 << 31) == 2147483648 }, ],
 
@@ -361,7 +418,7 @@ tests = [
   [ 'opt_aref', %q{ 'true'[0] == ?t }, ],
   [ 'opt_aset', %q{ [][0] = true }, ],
   [ 'opt_aset', %q{ {}[0] = true }, ],
-  [ 'opt_aset', %q{ x = 'frue'; x[0] = 't'; x }, ],
+  [ 'opt_aset', %q{ x = +'frue'; x[0] = 't'; x }, ],
   [ 'opt_aset', <<-'},', ], # {
     # opt_aref / opt_aset mixup situation
     class X; def x; {}; end; end
@@ -369,11 +426,6 @@ tests = [
     x&.x[true] ||= true         # here
   },
 
-  [ 'opt_aref_with', %q{ { 'true' => true }['true'] }, ],
-  [ 'opt_aref_with', %q{ Struct.new(:nil).new['nil'].nil? }, ],
-  [ 'opt_aset_with', %q{ {}['true'] = true }, ],
-  [ 'opt_aset_with', %q{ Struct.new(:true).new['true'] = true }, ],
-
   [ 'opt_length',  %q{   'true'       .length == 4 }, ],
   [ 'opt_length',  %q{   :true        .length == 4 }, ],
   [ 'opt_length',  %q{ [ 'true' ]     .length == 1 }, ],
diff --git a/bootstraptest/test_io.rb b/bootstraptest/test_io.rb
index 73deca8383..4081769a8c 100644
--- a/bootstraptest/test_io.rb
+++ b/bootstraptest/test_io.rb
@@ -1,3 +1,4 @@
+/freebsd/ =~ RUBY_PLATFORM or
 assert_finish 5, %q{
   r, w = IO.pipe
   t1 = Thread.new { r.sysread(1) }
@@ -30,6 +31,7 @@ assert_finish 10, %q{
   end
 }, '[ruby-dev:32566]'
 
+/freebsd/ =~ RUBY_PLATFORM or
 assert_finish 5, %q{
   r, w = IO.pipe
   Thread.new {
@@ -83,12 +85,13 @@ assert_normal_exit %q{
   ARGF.set_encoding "foo"
 }
 
+/(freebsd|mswin)/ =~ RUBY_PLATFORM or
 10.times do
   assert_normal_exit %q{
     at_exit { p :foo }
 
     megacontent = "abc" * 12345678
-    #File.open("megasrc", "w") {|f| f << megacontent }
+    #File.write("megasrc", megacontent)
 
     t0 = Thread.main
     Thread.new { sleep 0.001 until t0.stop?; Process.kill(:INT, $$) }
diff --git a/bootstraptest/test_jump.rb b/bootstraptest/test_jump.rb
index d07c47a56d..8751343b1f 100644
--- a/bootstraptest/test_jump.rb
+++ b/bootstraptest/test_jump.rb
@@ -292,7 +292,7 @@ assert_equal "true", %q{
       end
     end
   end
-  s = "foo"
+  s = +"foo"
   s.return_eigenclass == class << s; self; end
 }, '[ruby-core:21379]'
 
diff --git a/bootstraptest/test_literal.rb b/bootstraptest/test_literal.rb
index a0d4ee08c6..39e6527027 100644
--- a/bootstraptest/test_literal.rb
+++ b/bootstraptest/test_literal.rb
@@ -70,6 +70,7 @@ if /wasi/ !~ target_platform
   assert_equal "foo\n",           %q(`echo foo`)
   assert_equal "foo\n",           %q(s = "foo"; `echo #{s}`)
 end
+assert_equal "ECHO FOO",        %q(def `(s) s.upcase; end; `echo foo`)
 
 # regexp
 assert_equal '',                '//.source'
@@ -116,16 +117,16 @@ assert_equal '1',               'a = [obj = Object.new]; a.size'
 assert_equal 'true',            'a = [obj = Object.new]; a[0] == obj'
 assert_equal '5',               'a = [1,2,3]; a[1] = 5; a[1]'
 assert_equal 'bar',             '[*:foo];:bar'
-assert_equal '[1, 2]',          'def nil.to_a; [2]; end; [1, *nil]'
-assert_equal '[1, 2]',          'def nil.to_a; [1, 2]; end; [*nil]'
-assert_equal '[0, 1, {2=>3}]',  '[0, *[1], 2=>3]', "[ruby-dev:31592]"
+assert_equal '[]',              'def nil.to_a; [1, 2]; end; [*nil]'
+assert_equal '[1]',             'def nil.to_a; [2]; end; [1, *nil]'
+assert_equal '[0, 1, {2 => 3}]', '[0, *[1], 2=>3]', "[ruby-dev:31592]"
 
 
 # hash
 assert_equal 'Hash',            '{}.class'
 assert_equal '{}',              '{}.inspect'
 assert_equal 'Hash',            '{1=>2}.class'
-assert_equal '{1=>2}',          '{1=>2}.inspect'
+assert_equal '{1 => 2}',        '{1=>2}.inspect'
 assert_equal '2',               'h = {1 => 2}; h[1]'
 assert_equal '0',               'h = {1 => 2}; h.delete(1); h.size'
 assert_equal '',                'h = {1 => 2}; h.delete(1); h[1]'
diff --git a/bootstraptest/test_literal_suffix.rb b/bootstraptest/test_literal_suffix.rb
index c36fa7078f..7a4d67d0fa 100644
--- a/bootstraptest/test_literal_suffix.rb
+++ b/bootstraptest/test_literal_suffix.rb
@@ -46,9 +46,9 @@ assert_equal '1',               '1rescue nil'
 assert_equal '10000000000000000001/10000000000000000000',
              '1.0000000000000000001r'
 
-assert_equal 'syntax error, unexpected local variable or method, expecting end-of-input',
-             %q{begin eval('1ir', nil, '', 0); rescue SyntaxError => e; e.message[/\A:(?:\d+:)? (.*)/, 1] end}
-assert_equal 'syntax error, unexpected local variable or method, expecting end-of-input',
-             %q{begin eval('1.2ir', nil, '', 0); rescue SyntaxError => e; e.message[/\A:(?:\d+:)? (.*)/, 1] end}
-assert_equal 'syntax error, unexpected local variable or method, expecting end-of-input',
-             %q{begin eval('1e1r', nil, '', 0); rescue SyntaxError => e; e.message[/\A:(?:\d+:)? (.*)/, 1] end}
+assert_equal 'unexpected local variable or method, expecting end-of-input',
+             %q{begin eval('1ir', nil, '', 0); rescue SyntaxError => e; e.message[/(?:\^~*|\A:(?:\d+:)? syntax error,) (.*)/, 1]; end}
+assert_equal 'unexpected local variable or method, expecting end-of-input',
+             %q{begin eval('1.2ir', nil, '', 0); rescue SyntaxError => e; e.message[/(?:\^~*|\A:(?:\d+:)? syntax error,) (.*)/, 1]; end}
+assert_equal 'unexpected local variable or method, expecting end-of-input',
+             %q{begin eval('1e1r', nil, '', 0); rescue SyntaxError => e; e.message[/(?:\^~*|\A:(?:\d+:)? syntax error,) (.*)/, 1]; end}
diff --git a/bootstraptest/test_load.rb b/bootstraptest/test_load.rb
index e63c93a8f4..fa8d31c098 100644
--- a/bootstraptest/test_load.rb
+++ b/bootstraptest/test_load.rb
@@ -1,9 +1,9 @@
 assert_equal 'ok', %q{
-  open("require-lock-test.rb", "w") {|f|
-    f.puts "sleep 0.1"
-    f.puts "module M"
-    f.puts "end"
-  }
+  File.write("require-lock-test.rb", <<-END)
+    sleep 0.1
+    module M
+    end
+  END
   $:.unshift Dir.pwd
   vs = (1..2).map {|i|
     Thread.start {
@@ -16,7 +16,7 @@ assert_equal 'ok', %q{
 
 assert_equal 'ok', %q{
   %w[a a/foo b].each {|d| Dir.mkdir(d)}
-  open("b/foo", "w") {|f| f.puts "$ok = :ok"}
+  File.write("b/foo", "$ok = :ok\n")
   $:.replace(%w[a b])
   begin
     load "foo"
diff --git a/bootstraptest/test_method.rb b/bootstraptest/test_method.rb
index 04c9eb2d11..78aab73485 100644
--- a/bootstraptest/test_method.rb
+++ b/bootstraptest/test_method.rb
@@ -340,24 +340,6 @@ assert_equal '1',       %q( class C; def m() 7 end; private :m end
 assert_equal '1',       %q( class C; def m() 1 end; private :m end
                             C.new.send(:m) )
 
-# with block
-assert_equal '[[:ok1, :foo], [:ok2, :foo, :bar]]',
-%q{
-  class C
-    def [](a)
-      $ary << [yield, a]
-    end
-    def []=(a, b)
-      $ary << [yield, a, b]
-    end
-  end
-
-  $ary = []
-  C.new[:foo, &lambda{:ok1}]
-  C.new[:foo, &lambda{:ok2}] = :bar
-  $ary
-}
-
 # with
 assert_equal '[:ok1, [:ok2, 11]]', %q{
   class C
@@ -404,7 +386,6 @@ $result
 
 # aset and splat
 assert_equal '4', %q{class Foo;def []=(a,b,c,d);end;end;Foo.new[1,*a=[2,3]]=4}
-assert_equal '4', %q{class Foo;def []=(a,b,c,d);end;end;def m(&blk)Foo.new[1,*a=[2,3],&blk]=4;end;m{}}
 
 # post test
 assert_equal %q{[1, 2, :o1, :o2, [], 3, 4, NilClass, nil, nil]}, %q{
@@ -1107,10 +1088,6 @@ assert_equal 'ok', %q{
     'ok'
   end
 }
-assert_equal 'ok', %q{
-  [0][0, &proc{}] += 21
-  'ok'
-}, '[ruby-core:30534]'
 
 # should not cache when splat
 assert_equal 'ok', %q{
@@ -1190,3 +1167,270 @@ assert_equal 'DC', %q{
   test2 o1, [], block
   $result.join
 }
+
+assert_equal 'ok', %q{
+  def foo
+    binding
+    ["ok"].first
+  end
+  foo
+  foo
+}, '[Bug #20178]'
+
+assert_equal 'ok', %q{
+  def bar(x); x; end
+  def foo(...); bar(...); end
+  foo('ok')
+}
+
+assert_equal 'ok', %q{
+  def bar(x); x; end
+  def foo(z, ...); bar(...); end
+  foo(1, 'ok')
+}
+
+assert_equal 'ok', %q{
+  def bar(x, y); x; end
+  def foo(...); bar("ok", ...); end
+  foo(1)
+}
+
+assert_equal 'ok', %q{
+  def bar(x); x; end
+  def foo(...); 1.times { return bar(...) }; end
+  foo("ok")
+}
+
+assert_equal 'ok', %q{
+  def bar(x); x; end
+  def foo(...); x = nil; 1.times { x = bar(...) }; x; end
+  foo("ok")
+}
+
+assert_equal 'ok', %q{
+  def bar(x); yield; end
+  def foo(...); bar(...); end
+  foo(1) { "ok" }
+}
+
+assert_equal 'ok', %q{
+  def baz(x); x; end
+  def bar(...); baz(...); end
+  def foo(...); bar(...); end
+  foo("ok")
+}
+
+assert_equal '[1, 2, 3, 4]', %q{
+  def baz(a, b, c, d); [a, b, c, d]; end
+  def bar(...); baz(1, ...); end
+  def foo(...); bar(2, ...); end
+  foo(3, 4)
+}
+
+assert_equal 'ok', %q{
+  class Foo; def self.foo(x); x; end; end
+  class Bar < Foo; def self.foo(...); super; end; end
+  Bar.foo('ok')
+}
+
+assert_equal 'ok', %q{
+  class Foo; def self.foo(x); x; end; end
+  class Bar < Foo; def self.foo(...); super(...); end; end
+  Bar.foo('ok')
+}
+
+assert_equal 'ok', %q{
+  class Foo; def self.foo(x, y); x + y; end; end
+  class Bar < Foo; def self.foo(...); super("o", ...); end; end
+  Bar.foo('k')
+}
+
+assert_equal 'ok', %q{
+  def bar(a); a; end
+  def foo(...); lambda { bar(...) }; end
+  foo("ok").call
+}
+
+assert_equal 'ok', %q{
+  class Foo; def self.foo(x, y); x + y; end; end
+  class Bar < Foo; def self.y(&b); b; end; def self.foo(...); y { super("o", ...) }; end; end
+  Bar.foo('k').call
+}
+
+assert_equal 'ok', %q{
+  def baz(n); n; end
+  def foo(...); bar = baz(...); lambda { lambda { bar } }; end
+  foo("ok").call.call
+}
+
+assert_equal 'ok', %q{
+  class A; def self.foo(...); new(...); end; attr_reader :b; def initialize(a, b:"ng"); @a = a; @b = b; end end
+  A.foo(1).b
+  A.foo(1, b: "ok").b
+}
+
+assert_equal 'ok', %q{
+  class A; def initialize; @a = ["ok"]; end; def first(...); @a.first(...); end; end
+  def call x; x.first; end
+  def call1 x; x.first(1); end
+  call(A.new)
+  call1(A.new).first
+}
+
+assert_equal 'ok', %q{
+  class A; def foo; yield("o"); end; end
+  class B < A; def foo(...); super { |x| yield(x + "k") }; end; end
+  B.new.foo { |x| x }
+}
+
+assert_equal "[1, 2, 3, 4]", %q{
+  def foo(*b) = b
+
+  def forward(...)
+    splat = [1,2,3]
+    foo(*splat, ...)
+  end
+
+  forward(4)
+}
+
+assert_equal "[1, 2, 3, 4]", %q{
+class A
+  def foo(*b) = b
+end
+
+class B < A
+  def foo(...)
+    splat = [1,2,3]
+    super(*splat, ...)
+  end
+end
+
+B.new.foo(4)
+}
+
+assert_equal 'ok', %q{
+  class A; attr_reader :iv; def initialize(...) = @iv = "ok"; end
+  A.new("foo", bar: []).iv
+}
+
+assert_equal 'ok', %q{
+  def foo(a, b) = a + b
+  def bar(...) = foo(...)
+  bar(1, 2)
+  bar(1, 2)
+  begin
+    bar(1, 2, 3)
+    "ng"
+  rescue ArgumentError
+    "ok"
+  end
+}
+
+assert_equal 'ok', %q{
+  class C
+    def foo(...) = :ok
+    def bar(...) = __send__(:foo, ...)
+  end
+
+  C.new.bar
+}
+
+assert_equal 'ok', %q{
+  class C
+    def method_missing(...) = :ok
+    def foo(...) = xyzzy(...)
+  end
+
+  C.new.foo
+}
+
+assert_equal 'ok', %q{
+  class C
+    def initialize(a)
+    end
+  end
+
+  def foo(...)
+    C.new(...)
+    :ok
+  end
+
+  foo(*["bar"])
+  foo("baz")
+}
+
+assert_equal 'ok', %q{
+  class C
+    def foo(b:)
+      b
+    end
+  end
+
+  def foo(...)
+    C.new.send(...)
+  end
+
+  foo(:foo, b: :ok)
+  foo(*["foo"], b: :ok)
+}
+
+assert_equal 'ok', %q{
+  Thing = Struct.new(:value)
+
+  Obj = Thing.new("ok")
+
+  def delegate(...)
+    Obj.value(...)
+  end
+
+  def no_args
+    delegate
+  end
+
+  def splat_args(*args)
+    delegate(*args)
+  end
+
+  no_args
+  splat_args
+}
+
+assert_equal 'ok', %q{
+  class A
+    private
+    def foo = "ng"
+  end
+
+  class B
+    def initialize(o)
+      @o = o
+    end
+
+    def foo(...) = @o.foo(...)
+    def internal_foo = foo
+  end
+
+  b = B.new(A.new)
+
+  begin
+    b.internal_foo
+  rescue NoMethodError
+    "ok"
+  end
+}
+
+assert_equal 'ok', <<~RUBY
+  def test(*, kw: false)
+    "ok"
+  end
+
+  test
+RUBY
+
+assert_equal '[1, 2, 3]', %q{
+  def target(*args) = args
+  def x = [1]
+  def forwarder(...) = target(*x, 2, ...)
+  forwarder(3).inspect
+}, '[Bug #21832] post-splat args before forwarding'
diff --git a/bootstraptest/test_ractor.rb b/bootstraptest/test_ractor.rb
index b29db7ab0e..e2a3e8dd5b 100644
--- a/bootstraptest/test_ractor.rb
+++ b/bootstraptest/test_ractor.rb
@@ -67,7 +67,7 @@ assert_equal "#<Ractor:#1 running>", %q{
 # Return id, loc, and status for no-name ractor
 assert_match /^#<Ractor:#([^ ]*?) .+:[0-9]+ terminated>$/, %q{
   r = Ractor.new { '' }
-  r.take
+  r.join
   sleep 0.1 until r.inspect =~ /terminated/
   r.inspect
 }
@@ -75,7 +75,7 @@ assert_match /^#<Ractor:#([^ ]*?) .+:[0-9]+ terminated>$/, %q{
 # Return id, name, loc, and status for named ractor
 assert_match /^#<Ractor:#([^ ]*?) Test Ractor .+:[0-9]+ terminated>$/, %q{
   r = Ractor.new(name: 'Test Ractor') { '' }
-  r.take
+  r.join
   sleep 0.1 until r.inspect =~ /terminated/
   r.inspect
 }
@@ -86,7 +86,7 @@ assert_equal 'ok', %q{
   r = Ractor.new do
     'ok'
   end
-  r.take
+  r.value
 }
 
 # Passed arguments to Ractor.new will be a block parameter
@@ -96,7 +96,7 @@ assert_equal 'ok', %q{
   r = Ractor.new 'ok' do |msg|
     msg
   end
-  r.take
+  r.value
 }
 
 # Pass multiple arguments to Ractor.new
@@ -105,7 +105,7 @@ assert_equal 'ok', %q{
   r =  Ractor.new 'ping', 'pong' do |msg, msg2|
     [msg, msg2]
   end
-  'ok' if r.take == ['ping', 'pong']
+  'ok' if r.value == ['ping', 'pong']
 }
 
 # Ractor#send passes an object with copy to a Ractor
@@ -115,65 +115,23 @@ assert_equal 'ok', %q{
     msg = Ractor.receive
   end
   r.send 'ok'
-  r.take
+  r.value
 }
 
 # Ractor#receive_if can filter the message
-assert_equal '[2, 3, 1]', %q{
-  r = Ractor.new Ractor.current do |main|
-    main << 1
-    main << 2
-    main << 3
-  end
-  a = []
-  a << Ractor.receive_if{|msg| msg == 2}
-  a << Ractor.receive_if{|msg| msg == 3}
-  a << Ractor.receive
-}
-
-# Ractor#receive_if with break
-assert_equal '[2, [1, :break], 3]', %q{
-  r = Ractor.new Ractor.current do |main|
-    main << 1
-    main << 2
-    main << 3
-  end
-
-  a = []
-  a << Ractor.receive_if{|msg| msg == 2}
-  a << Ractor.receive_if{|msg| break [msg, :break]}
-  a << Ractor.receive
-}
+assert_equal '[1, 2, 3]', %q{
+  ports = 3.times.map{Ractor::Port.new}
 
-# Ractor#receive_if can't be called recursively
-assert_equal '[[:e1, 1], [:e2, 2]]', %q{
-  r = Ractor.new Ractor.current do |main|
-    main << 1
-    main << 2
-    main << 3
+  r = Ractor.new ports do |ports|
+    ports[0] << 3
+    ports[1] << 1
+    ports[2] << 2
   end
-
   a = []
-
-  Ractor.receive_if do |msg|
-    begin
-      Ractor.receive
-    rescue Ractor::Error
-      a << [:e1, msg]
-    end
-    true # delete 1 from queue
-  end
-
-  Ractor.receive_if do |msg|
-    begin
-      Ractor.receive_if{}
-    rescue Ractor::Error
-      a << [:e2, msg]
-    end
-    true # delete 2 from queue
-  end
-
-  a #
+  a << ports[1].receive # 1
+  a << ports[2].receive # 2
+  a << ports[0].receive # 3
+  a
 }
 
 # dtoa race condition
@@ -184,73 +142,145 @@ assert_equal '[:ok, :ok, :ok]', %q{
       10_000.times{ rand.to_s }
       :ok
     }
-  }.map(&:take)
+  }.map(&:value)
+}
+
+assert_equal "42", %q{
+  a = 42
+  Ractor.shareable_lambda{ a }.call
 }
 
-# Ractor.make_shareable issue for locals in proc [Bug #18023]
+# Ractor.shareable_proc issue for locals in proc [Bug #18023]
 assert_equal '[:a, :b, :c, :d, :e]', %q{
   v1, v2, v3, v4, v5 = :a, :b, :c, :d, :e
-  closure = Ractor.current.instance_eval{ Proc.new { [v1, v2, v3, v4, v5] } }
+  closure = Proc.new { [v1, v2, v3, v4, v5] }
+  Ractor.shareable_proc(&closure).call
+}
+
+# Ractor.shareable_proc makes a copy of given Proc
+assert_equal '[true, true]', %q{
+  pr1 = Proc.new do
+    self
+  end
+  pr2 = Ractor.shareable_proc(&pr1)
 
-  Ractor.make_shareable(closure).call
+  [pr1.call == self, pr2.call == nil]
 }
 
-# Ractor.make_shareable issue for locals in proc [Bug #18023]
-assert_equal '[:a, :b, :c, :d, :e, :f, :g]', %q{
-  a = :a
-  closure = Ractor.current.instance_eval do
-    -> {
-      b, c, d = :b, :c, :d
-      -> {
-        e, f, g = :e, :f, :g
-        -> { [a, b, c, d, e, f, g] }
-      }.call
-    }.call
+# Ractor.shareable_proc keeps the original Proc intact
+assert_equal '[SyntaxError, [Object, 43, 43], Binding]', %q{
+  a = 42
+  pr1 = Proc.new do
+    [self.class, eval("a"), binding.local_variable_get(:a)]
   end
+  a += 1
+  pr2 = Ractor.shareable_proc(&pr1)
 
-  Ractor.make_shareable(closure).call
+  r = []
+  begin
+    pr2.call
+  rescue SyntaxError
+    r << SyntaxError
+  end
+
+  r << pr1.call << pr1.binding.class
 }
 
-# Now autoload in non-main Ractor is not supported
-assert_equal 'ok', %q{
-  autoload :Foo, 'foo.rb'
-  r = Ractor.new do
-    p Foo
-  rescue Ractor::UnsafeError
-    :ok
+# Ractor.make_shareable mutates the original Proc
+# This is the current behavior, it's currently considered safe enough
+# because in most cases it would raise anyway due to not-shared self or not-shared captured variable value
+assert_equal '[[42, 42], Binding, true, SyntaxError, "Can\'t create Binding from isolated Proc"]', %q{
+  a = 42
+  pr1 = nil.instance_exec do
+    Proc.new do
+      [eval("a"), binding.local_variable_get(:a)]
+    end
+  end
+
+  r = [pr1.call, pr1.binding.class]
+
+  pr2 = Ractor.make_shareable(pr1)
+  r << pr1.equal?(pr2)
+
+  begin
+    pr1.call
+  rescue SyntaxError
+    r << SyntaxError
+  end
+
+  begin
+    r << pr1.binding
+  rescue ArgumentError
+    r << $!.message
+  end
+
+  r
+}
+
+# Ractor::IsolationError cases
+assert_equal '3', %q{
+  ok = 0
+
+  begin
+    a = 1
+    Ractor.shareable_proc{a}
+    a = 2
+  rescue Ractor::IsolationError => e
+    ok += 1
+  end
+
+  begin
+    cond = false
+    b = 1
+    b = 2 if cond
+    Ractor.shareable_proc{b}
+  rescue Ractor::IsolationError => e
+    ok += 1
+  end
+
+  begin
+    1.times{|i|
+      i = 2
+      Ractor.shareable_proc{i}
+    }
+  rescue Ractor::IsolationError => e
+    ok += 1
   end
-  r.take
 }
 
 ###
 ###
 # Ractor still has several memory corruption so skip huge number of tests
-if ENV['GITHUB_WORKFLOW'] &&
-   ENV['GITHUB_WORKFLOW'] == 'Compilations'
+if ENV['GITHUB_WORKFLOW'] == 'Compilations'
    # ignore the follow
 else
 
-# Ractor.select(*ractors) receives a values from a ractors.
-# It is similar to select(2) and Go's select syntax.
-# The return value is [ch, received_value]
+# Ractor.select with a Ractor argument
 assert_equal 'ok', %q{
   # select 1
   r1 = Ractor.new{'r1'}
-  r, obj = Ractor.select(r1)
-  'ok' if r == r1 and obj == 'r1'
+  port, obj = Ractor.select(r1)
+  if port == r1 and obj == 'r1'
+    'ok'
+  else
+    # failed
+    [port, obj].inspect
+  end
 }
 
 # Ractor.select from two ractors.
 assert_equal '["r1", "r2"]', %q{
   # select 2
-  r1 = Ractor.new{'r1'}
-  r2 = Ractor.new{'r2'}
-  rs = [r1, r2]
+  p1 = Ractor::Port.new
+  p2 = Ractor::Port.new
+  r1 = Ractor.new(p1){|p1| p1 << 'r1'}
+  r2 = Ractor.new(p2){|p2| p2 << 'r2'}
+  ps = [p1, p2]
   as = []
-  r, obj = Ractor.select(*rs)
-  rs.delete(r)
+  port, obj = Ractor.select(*ps)
+  ps.delete(port)
   as << obj
-  r, obj = Ractor.select(*rs)
+  port, obj = Ractor.select(*ps)
   as << obj
   as.sort #=> ["r1", "r2"]
 }
@@ -283,11 +313,10 @@ assert_equal 30.times.map { 'ok' }.to_s, %q{
   30.times.map{|i|
     test i
   }
-} unless ENV['RUN_OPTS'] =~ /--jit-min-calls=5/ || # This always fails with --jit-wait --jit-min-calls=5
-  (ENV.key?('TRAVIS') && ENV['TRAVIS_CPU_ARCH'] == 'arm64') # https://bugs.ruby-lang.org/issues/17878
+} unless (ENV.key?('TRAVIS') && ENV['TRAVIS_CPU_ARCH'] == 'arm64') # https://bugs.ruby-lang.org/issues/17878
 
 # Exception for empty select
-assert_match /specify at least one ractor/, %q{
+assert_match /specify at least one Ractor::Port or Ractor/, %q{
   begin
     Ractor.select
   rescue ArgumentError => e
@@ -295,30 +324,12 @@ assert_match /specify at least one ractor/, %q{
   end
 }
 
-# Outgoing port of a ractor will be closed when the Ractor is terminated.
-assert_equal 'ok', %q{
-  r = Ractor.new do
-    'finish'
-  end
-
-  r.take
-  sleep 0.1 until r.inspect =~ /terminated/
-
-  begin
-    o = r.take
-  rescue Ractor::ClosedError
-    'ok'
-  else
-    "ng: #{o}"
-  end
-}
-
 # Raise Ractor::ClosedError when try to send into a terminated ractor
 assert_equal 'ok', %q{
   r = Ractor.new do
   end
 
-  r.take # closed
+  r.join # closed
   sleep 0.1 until r.inspect =~ /terminated/
 
   begin
@@ -330,47 +341,16 @@ assert_equal 'ok', %q{
   end
 }
 
-# Raise Ractor::ClosedError when try to send into a closed actor
-assert_equal 'ok', %q{
-  r = Ractor.new { Ractor.receive }
-  r.close_incoming
-
-  begin
-    r.send(1)
-  rescue Ractor::ClosedError
-    'ok'
-  else
-    'ng'
-  end
-}
-
-# Raise Ractor::ClosedError when try to take from closed actor
-assert_equal 'ok', %q{
-  r = Ractor.new do
-    Ractor.yield 1
-    Ractor.receive
-  end
-
-  r.close_outgoing
-  begin
-    r.take
-  rescue Ractor::ClosedError
-    'ok'
-  else
-    'ng'
-  end
-}
-
-# Can mix with Thread#interrupt and Ractor#take [Bug #17366]
+# Can mix with Thread#interrupt and Ractor#join [Bug #17366]
 assert_equal 'err', %q{
-  Ractor.new{
+  Ractor.new do
     t = Thread.current
     begin
       Thread.new{ t.raise "err" }.join
     rescue => e
       e.message
     end
-  }.take
+  end.value
 }
 
 # Killed Ractor's thread yields nil
@@ -378,34 +358,18 @@ assert_equal 'nil', %q{
   Ractor.new{
     t = Thread.current
     Thread.new{ t.kill }.join
-  }.take.inspect #=> nil
+  }.value.inspect #=> nil
 }
 
-# Ractor.yield raises Ractor::ClosedError when outgoing port is closed.
+# Raise Ractor::ClosedError when try to send into a ractor with closed default port
 assert_equal 'ok', %q{
-  r = Ractor.new Ractor.current do |main|
+  r = Ractor.new {
+    Ractor.current.close
+    Ractor.main << :ok
     Ractor.receive
-    main << true
-    Ractor.yield 1
-  end
-
-  r.close_outgoing
-  r << true
-  Ractor.receive
-
-  begin
-    r.take
-  rescue Ractor::ClosedError
-    'ok'
-  else
-    'ng'
-  end
-}
+  }
 
-# Raise Ractor::ClosedError when try to send into a ractor with closed incoming port
-assert_equal 'ok', %q{
-  r = Ractor.new { Ractor.receive }
-  r.close_incoming
+  Ractor.receive # wait for ok
 
   begin
     r.send(1)
@@ -416,148 +380,82 @@ assert_equal 'ok', %q{
   end
 }
 
-# A ractor with closed incoming port still can send messages out
-assert_equal '[1, 2]', %q{
-  r = Ractor.new do
-    Ractor.yield 1
-    2
-  end
-  r.close_incoming
-
-  [r.take, r.take]
-}
-
-# Raise Ractor::ClosedError when try to take from a ractor with closed outgoing port
-assert_equal 'ok', %q{
-  r = Ractor.new do
-    Ractor.yield 1
-    Ractor.receive
-  end
-
-  sleep 0.01 # wait for Ractor.yield in r
-  r.close_outgoing
-  begin
-    r.take
-  rescue Ractor::ClosedError
-    'ok'
-  else
-    'ng'
-  end
-}
-
-# A ractor with closed outgoing port still can receive messages from incoming port
-assert_equal 'ok', %q{
-  r = Ractor.new do
-    Ractor.receive
-  end
-
-  r.close_outgoing
-  begin
-    r.send(1)
-  rescue Ractor::ClosedError
-    'ng'
-  else
-    'ok'
-  end
-}
-
 # Ractor.main returns main ractor
 assert_equal 'true', %q{
   Ractor.new{
     Ractor.main
-  }.take == Ractor.current
+  }.value == Ractor.current
 }
 
 # a ractor with closed outgoing port should terminate
 assert_equal 'ok', %q{
   Ractor.new do
-    close_outgoing
+    Ractor.current.close
   end
 
   true until Ractor.count == 1
   :ok
 }
 
-# multiple Ractors can receive (wait) from one Ractor
-assert_equal '[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]', %q{
-  pipe = Ractor.new do
-    loop do
-      Ractor.yield Ractor.receive
-    end
+# an exception in a Ractor main thread will be re-raised at Ractor#receive
+assert_equal '[RuntimeError, "ok", true]', %q{
+  r = Ractor.new do
+    raise 'ok' # exception will be transferred receiver
+  end
+  begin
+    r.join
+  rescue Ractor::RemoteError => e
+    [e.cause.class,   #=> RuntimeError
+     e.cause.message, #=> 'ok'
+     e.ractor == r]   #=> true
   end
-
-  RN = 10
-  rs = RN.times.map{|i|
-    Ractor.new pipe, i do |pipe, i|
-      msg = pipe.take
-      msg # ping-pong
-    end
-  }
-  RN.times{|i|
-    pipe << i
-  }
-  RN.times.map{
-    r, n = Ractor.select(*rs)
-    rs.delete r
-    n
-  }.sort
 }
 
-# Ractor.select also support multiple take, receive and yield
-assert_equal '[true, true, true]', %q{
-  RN = 10
-  CR = Ractor.current
-
-  rs = (1..RN).map{
-    Ractor.new do
-      CR.send 'send' + CR.take #=> 'sendyield'
-      'take'
-    end
-  }
-  received = []
-  take = []
-  yielded = []
-  until rs.empty?
-    r, v = Ractor.select(CR, *rs, yield_value: 'yield')
-    case r
-    when :receive
-      received << v
-    when :yield
-      yielded << v
-    else
-      take << v
-      rs.delete r
-    end
+# an exception in a Ractor will be re-raised at Ractor#value
+assert_equal '[RuntimeError, "ok", true]', %q{
+  r = Ractor.new do
+    raise 'ok' # exception will be transferred receiver
+  end
+  begin
+    r.value
+  rescue Ractor::RemoteError => e
+    [e.cause.class,   #=> RuntimeError
+     e.cause.message, #=> 'ok'
+     e.ractor == r]   #=> true
   end
-  [received.all?('sendyield'), yielded.all?(nil), take.all?('take')]
 }
 
-# multiple Ractors can send to one Ractor
-assert_equal '[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]', %q{
-  pipe = Ractor.new do
-    loop do
-      Ractor.yield Ractor.receive
+# an exception in a Ractor non-main thread will not be re-raised at Ractor#receive
+assert_equal 'ok', %q{
+  r = Ractor.new do
+    Thread.new do
+      raise 'ng'
     end
+    sleep 0.1
+    'ok'
   end
-
-  RN = 10
-  RN.times.map{|i|
-    Ractor.new pipe, i do |pipe, i|
-      pipe << i
-    end
-  }
-  RN.times.map{
-    pipe.take
-  }.sort
+  r.value
 }
 
-# an exception in a Ractor will be re-raised at Ractor#receive
-assert_equal '[RuntimeError, "ok", true]', %q{
-  r = Ractor.new do
-    raise 'ok' # exception will be transferred receiver
+# SystemExit from a Ractor is re-raised
+# [Bug #21505]
+assert_equal '[SystemExit, "exit", true]', %q{
+  r = Ractor.new { exit }
+  begin
+    r.value
+  rescue Ractor::RemoteError => e
+    [e.cause.class,   #=> RuntimeError
+     e.cause.message, #=> 'ok'
+     e.ractor == r]   #=> true
   end
+}
+
+# SystemExit from a Thread inside a Ractor is re-raised
+# [Bug #21505]
+assert_equal '[SystemExit, "exit", true]', %q{
+  r = Ractor.new { Thread.new { exit }.join }
   begin
-    r.take
+    r.value
   rescue Ractor::RemoteError => e
     [e.cause.class,   #=> RuntimeError
      e.cause.message, #=> 'ok'
@@ -566,7 +464,7 @@ assert_equal '[RuntimeError, "ok", true]', %q{
 }
 
 # threads in a ractor will killed
-assert_equal '{:ok=>3}', %q{
+assert_equal '{ok: 3}', %q{
   Ractor.new Ractor.current do |main|
     q = Thread::Queue.new
     Thread.new do
@@ -596,7 +494,7 @@ assert_equal '{:ok=>3}', %q{
   end
 
   3.times.map{Ractor.receive}.tally
-}
+} unless yjit_enabled? # YJIT: `[BUG] Bus Error at 0x000000010b7002d0` in jit_exec()
 
 # unshareable object are copied
 assert_equal 'false', %q{
@@ -605,7 +503,7 @@ assert_equal 'false', %q{
     msg.object_id
   end
 
-  obj.object_id == r.take
+  obj.object_id == r.value
 }
 
 # To copy the object, now Marshal#dump is used
@@ -623,11 +521,12 @@ assert_equal "allocator undefined for Thread", %q{
 }
 
 # send shareable and unshareable objects
-assert_equal "ok", %q{
-  echo_ractor = Ractor.new do
+assert_equal "ok", <<~'RUBY', frozen_string_literal: false
+  port = Ractor::Port.new
+  echo_ractor = Ractor.new port do |port|
     loop do
       v = Ractor.receive
-      Ractor.yield v
+      port << v
     end
   end
 
@@ -675,13 +574,13 @@ assert_equal "ok", %q{
 
   shareable_objects.map{|o|
     echo_ractor << o
-    o2 = echo_ractor.take
+    o2 = port.receive
     results << "#{o} is copied" unless o.object_id == o2.object_id
   }
 
   unshareable_objects.map{|o|
     echo_ractor << o
-    o2 = echo_ractor.take
+    o2 = port.receive
     results << "#{o.inspect} is not copied" if o.object_id == o2.object_id
   }
 
@@ -690,10 +589,10 @@ assert_equal "ok", %q{
   else
     results.inspect
   end
-}
+RUBY
 
 # frozen Objects are shareable
-assert_equal [false, true, false].inspect, %q{
+assert_equal [false, true, false].inspect, <<~'RUBY', frozen_string_literal: false
   class C
     def initialize freeze
       @a = 1
@@ -707,7 +606,7 @@ assert_equal [false, true, false].inspect, %q{
   def check obj1
     obj2 = Ractor.new obj1 do |obj|
       obj
-    end.take
+    end.value
 
     obj1.object_id == obj2.object_id
   end
@@ -716,11 +615,11 @@ assert_equal [false, true, false].inspect, %q{
   results << check(C.new(true))         # false
   results << check(C.new(true).freeze)  # true
   results << check(C.new(false).freeze) # false
-}
+RUBY
 
 # move example2: String
 # touching moved object causes an error
-assert_equal 'hello world', %q{
+assert_equal 'hello world', <<~'RUBY', frozen_string_literal: false
   # move
   r = Ractor.new do
     obj = Ractor.receive
@@ -729,7 +628,7 @@ assert_equal 'hello world', %q{
 
   str = 'hello'
   r.send str, move: true
-  modified = r.take
+  modified = r.value
 
   begin
     str << ' exception' # raise Ractor::MovedError
@@ -738,7 +637,7 @@ assert_equal 'hello world', %q{
   else
     raise 'unreachable'
   end
-}
+RUBY
 
 # move example2: Array
 assert_equal '[0, 1]', %q{
@@ -749,7 +648,7 @@ assert_equal '[0, 1]', %q{
 
   a1 = [0]
   r.send a1, move: true
-  a2 = r.take
+  a2 = r.value
   begin
     a1 << 2 # raise Ractor::MovedError
   rescue Ractor::MovedError
@@ -757,70 +656,39 @@ assert_equal '[0, 1]', %q{
   end
 }
 
-# move with yield
-assert_equal 'hello', %q{
-  r = Ractor.new do
-    Thread.current.report_on_exception = false
-    obj = 'hello'
-    Ractor.yield obj, move: true
-    obj << 'world'
-  end
-
-  str = r.take
-  begin
-    r.take
-  rescue Ractor::RemoteError
-    str #=> "hello"
-  end
-}
-
-# yield/move should not make moved object when the yield is not succeeded
-assert_equal '"str"', %q{
-  R = Ractor.new{}
-  M = Ractor.current
-  r = Ractor.new do
-    s = 'str'
-    selected_r, v = Ractor.select R, yield_value: s, move: true
-    raise if selected_r != R # taken from R
-    M.send s.inspect # s should not be a moved object
-  end
-
-  Ractor.receive
-}
-
-# yield/move can fail
-assert_equal "allocator undefined for Thread", %q{
+# unshareable frozen objects should still be frozen in new ractor after move
+assert_equal 'true', %q{
   r = Ractor.new do
-    obj = Thread.new{}
-    Ractor.yield obj
-  rescue => e
-    e.message
+    obj = receive
+    { frozen: obj.frozen? }
   end
-  r.take
+  obj = [Object.new].freeze
+  r.send(obj, move: true)
+  r.value[:frozen]
 }
 
-# Access to global-variables are prohibited
-assert_equal 'can not access global variables $gv from non-main Ractors', %q{
+# Access to global-variables are prohibited (read)
+assert_equal 'can not access global variable $gv from non-main Ractor', %q{
   $gv = 1
   r = Ractor.new do
     $gv
   end
 
   begin
-    r.take
+    r.join
   rescue Ractor::RemoteError => e
     e.cause.message
   end
 }
 
-# Access to global-variables are prohibited
-assert_equal 'can not access global variables $gv from non-main Ractors', %q{
+# Access to global-variables are prohibited (write)
+assert_equal 'can not access global variable $gv from non-main Ractor', %q{
   r = Ractor.new do
     $gv = 1
   end
 
   begin
-    r.take
+    r.join
   rescue Ractor::RemoteError => e
     e.cause.message
   end
@@ -834,7 +702,7 @@ assert_equal 'ok', %q{
     }
   end
 
-  [$stdin, $stdout, $stderr].zip(r.take){|io, (oid, fno)|
+  [$stdin, $stdout, $stderr].zip(r.value){|io, (oid, fno)|
     raise "should not be different object" if io.object_id == oid
     raise "fd should be same" unless io.fileno == fno
   }
@@ -850,7 +718,7 @@ assert_equal 'ok', %q{
     'ok'
   end
 
-  r.take
+  r.value
 }
 
 # $DEBUG, $VERBOSE are Ractor local
@@ -908,7 +776,7 @@ assert_equal 'true', %q{
 
   h = Ractor.new do
     ractor_local_globals
-  end.take
+  end.value
   ractor_local_globals == h #=> true
 }
 
@@ -917,7 +785,8 @@ assert_equal 'false', %q{
   r = Ractor.new do
     self.object_id
   end
-  r.take == self.object_id #=> false
+  ret = r.value
+  ret == self.object_id
 }
 
 # self is a Ractor instance
@@ -925,7 +794,12 @@ assert_equal 'true', %q{
   r = Ractor.new do
     self.object_id
   end
-  r.object_id == r.take #=> true
+  ret = r.value
+  if r.object_id == ret #=> true
+    true
+  else
+    raise [ret, r.object_id].inspect
+  end
 }
 
 # given block Proc will be isolated, so can not access outer variables.
@@ -940,8 +814,39 @@ assert_equal 'ArgumentError', %q{
   end
 }
 
+# eval with outer locals in a Ractor raises SyntaxError
+# [Bug #21522]
+assert_equal 'SyntaxError', %q{
+  outer = 42
+  r = Ractor.new do
+    eval("outer")
+  end
+  begin
+    r.value
+  rescue Ractor::RemoteError => e
+    e.cause.class
+  end
+}
+
+# eval of an undefined name in a Ractor raises NameError
+assert_equal 'NameError', %q{
+  r = Ractor.new do
+    eval("totally_undefined_name")
+  end
+  begin
+    r.value
+  rescue Ractor::RemoteError => e
+    e.cause.class
+  end
+}
+
+# eval of a local defined inside the Ractor works
+assert_equal '99', %q{
+  Ractor.new { inner = 99; eval("inner").to_s }.value
+}
+
 # ivar in shareable-objects are not allowed to access from non-main Ractor
-assert_equal "can not get unshareable values from instance variables of classes/modules from non-main Ractors", %q{
+assert_equal "can not get unshareable values from instance variables of classes/modules from non-main Ractors (@iv from C)", <<~'RUBY', frozen_string_literal: false
   class C
     @iv = 'str'
   end
@@ -952,13 +857,12 @@ assert_equal "can not get unshareable values from instance variables of classes/
     end
   end
 
-
   begin
-    r.take
+    r.value
   rescue Ractor::RemoteError => e
     e.cause.message
   end
-}
+RUBY
 
 # ivar in shareable-objects are not allowed to access from non-main Ractor
 assert_equal 'can not access instance variables of shareable objects from non-main Ractors', %q{
@@ -970,7 +874,7 @@ assert_equal 'can not access instance variables of shareable objects from non-ma
   end
 
   begin
-    r.take
+    r.value
   rescue Ractor::RemoteError => e
     e.cause.message
   end
@@ -996,7 +900,7 @@ assert_equal 'can not access instance variables of shareable objects from non-ma
   end
 
   begin
-    r.take
+    r.value
   rescue Ractor::RemoteError => e
     e.cause.message
   end
@@ -1017,7 +921,7 @@ assert_equal 'can not access instance variables of shareable objects from non-ma
   end
 
   begin
-    r.take
+    r.value
   rescue Ractor::RemoteError => e
     e.cause.message
   end
@@ -1031,7 +935,7 @@ assert_equal '11', %q{
 
     Ractor.new obj do |obj|
       obj.instance_variable_get('@a')
-    end.take.to_s
+    end.value.to_s
   }.join
 }
 
@@ -1057,33 +961,68 @@ assert_equal '333', %q{
     def self.fstr = @fstr
   end
 
-  a = Ractor.new{ C.int }.take
+  a = Ractor.new{ C.int }.value
   b = Ractor.new do
     C.str.to_i
   rescue Ractor::IsolationError
     10
-  end.take
+  end.value
   c = Ractor.new do
     C.fstr.to_i
-  end.take
+  end.value
 
-  d = Ractor.new{ M.int }.take
+  d = Ractor.new{ M.int }.value
   e = Ractor.new do
     M.str.to_i
   rescue Ractor::IsolationError
     20
-  end.take
+  end.value
   f = Ractor.new do
     M.fstr.to_i
-  end.take
+  end.value
 
 
   # 1 + 10 + 100 + 2 + 20 + 200
   a + b + c + d + e + f
 }
 
+assert_equal '["instance-variable", "instance-variable", nil]', %q{
+  class C
+    @iv1 = ""
+    @iv2 = 42
+    def self.iv1 = defined?(@iv1) # "instance-variable"
+    def self.iv2 = defined?(@iv2) # "instance-variable"
+    def self.iv3 = defined?(@iv3) # nil
+  end
+
+  Ractor.new{
+    [C.iv1, C.iv2, C.iv3]
+  }.value
+}
+
+# moved objects have their shape properly set to original object's shape
+assert_equal '1234', %q{
+  class Obj
+    attr_accessor :a, :b, :c, :d
+    def initialize
+      @a = 1
+      @b = 2
+      @c = 3
+    end
+  end
+  r = Ractor.new do
+    obj = receive
+    obj.d = 4
+    [obj.a, obj.b, obj.c, obj.d]
+  end
+  obj = Obj.new
+  r.send(obj, move: true)
+  values = r.value
+  values.join
+}
+
 # cvar in shareable-objects are not allowed to access from non-main Ractor
-assert_equal 'can not access class variables from non-main Ractors', %q{
+assert_equal 'can not access class variables from non-main Ractors (@@cv from C)', %q{
   class C
     @@cv = 'str'
   end
@@ -1095,14 +1034,14 @@ assert_equal 'can not access class variables from non-main Ractors', %q{
   end
 
   begin
-    r.take
+    r.join
   rescue Ractor::RemoteError => e
     e.cause.message
   end
 }
 
 # also cached cvar in shareable-objects are not allowed to access from non-main Ractor
-assert_equal 'can not access class variables from non-main Ractors', %q{
+assert_equal 'can not access class variables from non-main Ractors (@@cv from C)', %q{
   class C
     @@cv = 'str'
     def self.cv
@@ -1117,14 +1056,14 @@ assert_equal 'can not access class variables from non-main Ractors', %q{
   end
 
   begin
-    r.take
+    r.join
   rescue Ractor::RemoteError => e
     e.cause.message
   end
 }
 
 # Getting non-shareable objects via constants by other Ractors is not allowed
-assert_equal 'can not access non-shareable objects in constant C::CONST by non-main Ractor.', %q{
+assert_equal 'can not access non-shareable objects in constant C::CONST by non-main Ractor.', <<~'RUBY', frozen_string_literal: false
   class C
     CONST = 'str'
   end
@@ -1132,44 +1071,58 @@ assert_equal 'can not access non-shareable objects in constant C::CONST by non-m
     C::CONST
   end
   begin
-    r.take
+    r.join
   rescue Ractor::RemoteError => e
     e.cause.message
   end
-}
+  RUBY
 
-# Constant cache should care about non-sharable constants
-assert_equal "can not access non-shareable objects in constant Object::STR by non-main Ractor.", %q{
+# Constant cache should care about non-shareable constants
+assert_equal "can not access non-shareable objects in constant Object::STR by non-main Ractor.", <<~'RUBY', frozen_string_literal: false
   STR = "hello"
   def str; STR; end
   s = str() # fill const cache
   begin
-    Ractor.new{ str() }.take
+    Ractor.new{ str() }.join
   rescue Ractor::RemoteError => e
     e.cause.message
   end
-}
+RUBY
+
+# The correct constant path shall be reported
+assert_equal "can not access non-shareable objects in constant Object::STR by non-main Ractor.", <<~'RUBY', frozen_string_literal: false
+  STR = "hello"
+  module M
+    def self.str; STR; end
+  end
+
+  begin
+    Ractor.new{ M.str }.join
+  rescue Ractor::RemoteError => e
+    e.cause.message
+  end
+RUBY
 
 # Setting non-shareable objects into constants by other Ractors is not allowed
-assert_equal 'can not set constants with non-shareable objects by non-main Ractors', %q{
+assert_equal 'can not set constants with non-shareable objects by non-main Ractors', <<~'RUBY', frozen_string_literal: false
   class C
   end
   r = Ractor.new do
     C::CONST = 'str'
   end
   begin
-    r.take
+    r.join
   rescue Ractor::RemoteError => e
     e.cause.message
   end
-}
+RUBY
 
 # define_method is not allowed
 assert_equal "defined with an un-shareable Proc in a different Ractor", %q{
   str = "foo"
   define_method(:buggy){|i| str << "#{i}"}
   begin
-    Ractor.new{buggy(10)}.take
+    Ractor.new{buggy(10)}.join
   rescue => e
     e.cause.message
   end
@@ -1180,7 +1133,7 @@ assert_equal '[1000, 3]', %q{
   A = Array.new(1000).freeze # [nil, ...]
   H = {a: 1, b: 2, c: 3}.freeze
 
-  Ractor.new{ [A.size, H.size] }.take
+  Ractor.new{ [A.size, H.size] }.value
 }
 
 # Ractor.count
@@ -1190,15 +1143,15 @@ assert_equal '[1, 4, 3, 2, 1]', %q{
   ractors = (1..3).map { Ractor.new { Ractor.receive } }
   counts << Ractor.count
 
-  ractors[0].send('End 0').take
+  ractors[0].send('End 0').join
   sleep 0.1 until ractors[0].inspect =~ /terminated/
   counts << Ractor.count
 
-  ractors[1].send('End 1').take
+  ractors[1].send('End 1').join
   sleep 0.1 until ractors[1].inspect =~ /terminated/
   counts << Ractor.count
 
-  ractors[2].send('End 2').take
+  ractors[2].send('End 2').join
   sleep 0.1 until ractors[2].inspect =~ /terminated/
   counts << Ractor.count
 
@@ -1211,11 +1164,11 @@ assert_equal '0', %q{
     n = 0
     ObjectSpace.each_object{|o| n += 1 unless Ractor.shareable?(o)}
     n
-  }.take
+  }.value
 }
 
 # ObjectSpace._id2ref can not handle unshareable objects with Ractors
-assert_equal 'ok', %q{
+assert_equal 'ok', <<~'RUBY', frozen_string_literal: false
   s = 'hello'
 
   Ractor.new s.object_id do |id ;s|
@@ -1224,11 +1177,29 @@ assert_equal 'ok', %q{
     rescue => e
       :ok
     end
-  end.take
-}
+  end.value
+RUBY
+
+# Inserting into the id2ref table should be Ractor-safe
+assert_equal 'ok', <<~'RUBY'
+  # Force all calls to Kernel#object_id to insert into the id2ref table
+  obj = Object.new
+  ObjectSpace._id2ref(obj.object_id) rescue nil
+
+  10.times.map do
+    Ractor.new do
+      10_000.times do
+        a = Object.new
+        a.object_id
+      end
+    end
+  end.map(&:value)
+
+  :ok
+RUBY
 
 # Ractor.make_shareable(obj)
-assert_equal 'true', %q{
+assert_equal 'true', <<~'RUBY', frozen_string_literal: false
   class C
     def initialize
       @a = 'foo'
@@ -1299,7 +1270,7 @@ assert_equal 'true', %q{
   }
 
   Ractor.shareable?(a)
-}
+RUBY
 
 # Ractor.make_shareable(obj) doesn't freeze shareable objects
 assert_equal 'true', %q{
@@ -1308,19 +1279,42 @@ assert_equal 'true', %q{
   [a.frozen?, a[0].frozen?] == [true, false]
 }
 
-# Ractor.make_shareable(a_proc) makes a proc shareable.
-assert_equal 'true', %q{
-  a = [1, [2, 3], {a: "4"}]
+# Ractor.make_shareable(a_proc) requires a shareable receiver
+assert_equal '[:ok, "Proc\'s self is not shareable:"]', %q{
+  pr1 = nil.instance_exec { Proc.new{} }
+  pr2 = Proc.new{}
 
-  pr = Ractor.current.instance_eval do
-    Proc.new do
-      a
+  [pr1, pr2].map do |pr|
+    begin
+      Ractor.make_shareable(pr)
+    rescue Ractor::Error => e
+      e.message[/^.+?:/]
+    else
+      :ok
     end
   end
+}
+
+# Ractor.make_shareable(Method/UnboundMethod)
+assert_equal 'true', %q{
+  # raise because receiver is unshareable
+  begin
+    _m0 = Ractor.make_shareable(self.method(:__id__))
+  rescue => e
+    raise e unless e.message =~ /can not make shareable object/
+  else
+    raise "no error"
+  end
 
-  Ractor.make_shareable(a) # referred value should be shareable
-  Ractor.make_shareable(pr)
-  Ractor.shareable?(pr)
+  # Method with shareable receiver
+  M1 = Ractor.make_shareable(Object.method(:__id__))
+
+  # UnboundMethod
+  M2 = Ractor.make_shareable(Object.instance_method(:__id__))
+
+  Ractor.new do
+    Object.__id__ == M1.call && M1.call == M2.bind_call(Object)
+  end.value
 }
 
 # Ractor.shareable?(recursive_objects)
@@ -1355,29 +1349,10 @@ assert_equal '[C, M]', %q{
 assert_equal '1', %q{
   class C
     a = 1
-    define_method "foo", Ractor.make_shareable(Proc.new{ a })
-    a = 2
-  end
-
-  Ractor.new{ C.new.foo }.take
-}
-
-# Ractor.make_shareable(a_proc) makes a proc shareable.
-assert_equal 'can not make a Proc shareable because it accesses outer variables (a).', %q{
-  a = b = nil
-  pr = Ractor.current.instance_eval do
-    Proc.new do
-      c = b # assign to a is okay because c is block local variable
-      # reading b is okay
-      a = b # assign to a is not allowed #=> Ractor::Error
-    end
+    define_method "foo", Ractor.shareable_proc{ a }
   end
 
-  begin
-    Ractor.make_shareable(pr)
-  rescue => e
-    e.message
-  end
+  Ractor.new{ C.new.foo }.value
 }
 
 # Ractor.make_shareable(obj, copy: true) makes copied shareable object.
@@ -1396,14 +1371,14 @@ assert_equal '[false, false, true, true]', %q{
 }
 
 # TracePoint with normal Proc should be Ractor local
-assert_equal '[4, 8]', %q{
+assert_equal '[6, 10]', %q{
   rs = []
   TracePoint.new(:line){|tp| rs << tp.lineno if tp.path == __FILE__}.enable do
-    Ractor.new{ # line 4
+    Ractor.new{ # line 5
       a = 1
       b = 2
-    }.take
-    c = 3       # line 8
+    }.value
+    c = 3       # line 9
   end
   rs
 }
@@ -1412,7 +1387,7 @@ assert_equal '[4, 8]', %q{
 assert_equal '[true, false]', %q{
   Ractor.new([[]].freeze) { |ary|
     [ary.frozen?, ary.first.frozen? ]
-  }.take
+  }.value
 }
 
 # Ractor deep copies frozen objects (str)
@@ -1420,7 +1395,7 @@ assert_equal '[true, false]', %q{
   s = String.new.instance_eval { @x = []; freeze}
   Ractor.new(s) { |s|
     [s.frozen?, s.instance_variable_get(:@x).frozen?]
-  }.take
+  }.value
 }
 
 # Can not trap with not isolated Proc on non-main ractor
@@ -1428,33 +1403,85 @@ assert_equal '[:ok, :ok]', %q{
   a = []
   Ractor.new{
     trap(:INT){p :ok}
-  }.take
+  }.join
   a << :ok
 
   begin
     Ractor.new{
       s = 'str'
       trap(:INT){p s}
-    }.take
-  rescue => Ractor::RemoteError
+    }.join
+  rescue Ractor::RemoteError
     a << :ok
   end
 }
 
+# Ractor.select is interruptible
+assert_normal_exit %q{
+  trap(:INT) do
+    exit
+  end
+
+  r = Ractor.new do
+    loop do
+      sleep 1
+    end
+  end
+
+  Thread.new do
+    sleep 0.5
+    Process.kill(:INT, Process.pid)
+  end
+  Ractor.select(r)
+}
+
 # Ractor-local storage
 assert_equal '[nil, "b", "a"]', %q{
   ans = []
   Ractor.current[:key] = 'a'
   r = Ractor.new{
-    Ractor.yield self[:key]
+    Ractor.main << self[:key]
     self[:key] = 'b'
     self[:key]
   }
-  ans << r.take
-  ans << r.take
+  ans << Ractor.receive
+  ans << r.value
   ans << Ractor.current[:key]
 }
 
+assert_equal '1', %q{
+  N = 1_000
+  Ractor.new{
+    a = []
+    1_000.times.map{|i|
+      Thread.new(i){|i|
+        Thread.pass if i < N
+        a << Ractor.store_if_absent(:i){ i }
+        a << Ractor.current[:i]
+      }
+    }.each(&:join)
+    a.uniq.size
+  }.value
+}
+
+# Ractor-local storage
+assert_equal '2', %q{
+  Ractor.new {
+    fails = 0
+    begin
+      Ractor.main[:key] # cannot get ractor local storage from non-main ractor
+    rescue => e
+      fails += 1 if e.message =~ /Cannot get ractor local/
+    end
+    begin
+      Ractor.main[:key] = 'val'
+    rescue => e
+      fails += 1 if e.message =~ /Cannot set ractor local/
+    end
+    fails
+  }.value
+}
+
 ###
 ### Synchronization tests
 ###
@@ -1468,51 +1495,54 @@ assert_equal "#{N}#{N}", %Q{
     Ractor.new{
       N.times{|i| -(i.to_s)}
     }
-  }.map{|r| r.take}.join
+  }.map{|r| r.value}.join
 }
 
-# enc_table
-assert_equal "#{N/10}", %Q{
-  Ractor.new do
-    loop do
-      Encoding.find("test-enc-#{rand(5_000)}").inspect
-    rescue ArgumentError => e
+assert_equal "ok", %Q{
+  N = #{N}
+  a, b = 2.times.map{
+    Ractor.new{
+      N.times.map{|i| -(i.to_s)}
+    }
+  }.map{|r| r.value}
+  N.times do |i|
+    unless a[i].equal?(b[i])
+      raise [a[i], b[i]].inspect
+    end
+    unless a[i] == i.to_s
+      raise [i, a[i], b[i]].inspect
     end
   end
-
-  src = Encoding.find("UTF-8")
-  #{N/10}.times{|i|
-    src.replicate("test-enc-\#{i}")
-  }
+  :ok
 }
 
-# Generic ivtbl
+# Generic fields_tbl
 n = N/2
 assert_equal "#{n}#{n}", %Q{
   2.times.map{
     Ractor.new do
       #{n}.times do
-        obj = ''
+        obj = +''
         obj.instance_variable_set("@a", 1)
         obj.instance_variable_set("@b", 1)
         obj.instance_variable_set("@c", 1)
         obj.instance_variable_defined?("@a")
       end
     end
-  }.map{|r| r.take}.join
+  }.map{|r| r.value}.join
 }
 
-# NameError
-assert_equal "ok", %q{
+# Now NoMethodError is copyable
+assert_equal "NoMethodError", %q{
+  obj = "".freeze # NameError refers the receiver indirectly
   begin
-    bar
+    obj.bar
   rescue => err
   end
-  begin
-    Ractor.new{} << err
-  rescue TypeError
-    'ok'
-  end
+
+  r = Ractor.new{ Ractor.receive }
+  r << err
+  r.value.class
 }
 
 assert_equal "ok", %q{
@@ -1530,53 +1560,997 @@ assert_equal "ok", %q{
 
 # Can yield back values while GC is sweeping [Bug #18117]
 assert_equal "ok", %q{
+  port = Ractor::Port.new
   workers = (0...8).map do
-    Ractor.new do
+    Ractor.new port do |port|
       loop do
         10_000.times.map { Object.new }
-        Ractor.yield Time.now
+        port << Time.now
+        Ractor.receive
       end
     end
   end
 
-  1_000.times { idle_worker, tmp_reporter = Ractor.select(*workers) }
+  100.times {
+    workers.each do
+      port.receive
+    end
+    workers.each do |w|
+      w.send(nil)
+    end
+  }
   "ok"
-}
+} if !yjit_enabled? && ENV['GITHUB_WORKFLOW'] != 'ModGC' # flaky
 
+# check method cache invalidation
 assert_equal "ok", %q{
-  def foo(*); ->{ super }; end
+  module M
+    def foo
+      @foo
+    end
+  end
+
+  class A
+    include M
+
+    def initialize
+      100.times { |i| instance_variable_set(:"@var_#{i}", "bad: #{i}") }
+      @foo = 2
+    end
+  end
+
+  class B
+    include M
+
+    def initialize
+      @foo = 1
+    end
+  end
+
+  Ractor.new do
+    b = B.new
+    100_000.times do
+      raise unless b.foo == 1
+    end
+  end
+
+  a = A.new
+  100_000.times do
+    raise unless a.foo == 2
+  end
+
+  "ok"
+}
+
+# check method cache invalidation
+assert_equal 'true', %q{
+  class C1; def self.foo = 1; end
+  class C2; def self.foo = 2; end
+  class C3; def self.foo = 3; end
+  class C4; def self.foo = 5; end
+  class C5; def self.foo = 7; end
+  class C6; def self.foo = 11; end
+  class C7; def self.foo = 13; end
+  class C8; def self.foo = 17; end
+
+  LN = 10_000
+  RN = 10
+  CS = [C1, C2, C3, C4, C5, C6, C7, C8]
+  rs = RN.times.map{|i|
+    Ractor.new(CS.shuffle){|cs|
+      LN.times.sum{
+        cs.inject(1){|r, c| r * c.foo} # c.foo invalidates method cache entry
+      }
+    }
+  }
+
+  n = CS.inject(1){|r, c| r * c.foo} * LN
+  rs.map{|r| r.value} == Array.new(RN){n}
+}
+
+# check method cache invalidation
+assert_equal 'true', %q{
+  class Foo
+    def hello = nil
+  end
+
+  r1 = Ractor.new do
+    1000.times do
+      class Foo
+        def hello = nil
+      end
+    end
+  end
+
+  r2 = Ractor.new do
+    1000.times do
+      o = Foo.new
+      o.hello
+    end
+  end
+
+  r1.value
+  r2.value
+
+  true
+}
+
+# check experimental warning
+assert_match /\Atest_ractor\.rb:1:\s+warning:\s+Ractor API is experimental/, %q{
+  Warning[:experimental] = $VERBOSE = true
+  STDERR.reopen(STDOUT)
+  eval("Ractor.new{}.value", nil, "test_ractor.rb", 1)
+}, frozen_string_literal: false
+
+# check moved object
+assert_equal 'ok', %q{
+  r = Ractor.new do
+    Ractor.receive
+    GC.start
+    :ok
+  end
+
+  obj = begin
+  raise
+  rescue => e
+    e = Marshal.load(Marshal.dump(e))
+  end
+
+  r.send obj, move: true
+  r.value
+}
+
+## Ractor::Selector
+
+# Selector#empty? returns true
+assert_equal 'true', %q{
+  skip true unless defined? Ractor::Selector
+
+  s = Ractor::Selector.new
+  s.empty?
+}
+
+# Selector#empty? returns false if there is target ractors
+assert_equal 'false', %q{
+  skip false unless defined? Ractor::Selector
+
+  s = Ractor::Selector.new
+  s.add Ractor.new{}
+  s.empty?
+}
+
+# Selector#clear removes all ractors from the waiting list
+assert_equal 'true', %q{
+  skip true unless defined? Ractor::Selector
+
+  s = Ractor::Selector.new
+  s.add Ractor.new{10}
+  s.add Ractor.new{20}
+  s.clear
+  s.empty?
+}
+
+# Selector#wait can wait multiple ractors
+assert_equal '[10, 20, true]', %q{
+  skip [10, 20, true] unless defined? Ractor::Selector
+
+  s = Ractor::Selector.new
+  s.add Ractor.new{10}
+  s.add Ractor.new{20}
+  r, v = s.wait
+  vs = []
+  vs << v
+  r, v = s.wait
+  vs << v
+  [*vs.sort, s.empty?]
+} if defined? Ractor::Selector
+
+# Selector#wait can wait multiple ractors with receiving.
+assert_equal '30', %q{
+  skip 30 unless defined? Ractor::Selector
+
+  RN = 30
+  rs = RN.times.map{
+    Ractor.new{ :v }
+  }
+  s = Ractor::Selector.new(*rs)
+
+  results = []
+  until s.empty?
+    results << s.wait
+
+    # Note that s.wait can raise an exception because other Ractors/Threads
+    # can take from the same ractors in the waiting set.
+    # In this case there is no other takers so `s.wait` doesn't raise an error.
+  end
+
+  results.size
+} if defined? Ractor::Selector
+
+# Selector#wait can support dynamic addition
+assert_equal '600', %q{
+  skip 600 unless defined? Ractor::Selector
+
+  RN = 100
+  s = Ractor::Selector.new
+  port = Ractor::Port.new
+  rs = RN.times.map{
+    Ractor.new{
+      Ractor.main << Ractor.new(port){|port| port << :v3; :v4 }
+      Ractor.main << Ractor.new(port){|port| port << :v5; :v6 }
+      Ractor.yield :v1
+      :v2
+    }
+  }
+
+  rs.each{|r| s.add(r)}
+  h = {v1: 0, v2: 0, v3: 0, v4: 0, v5: 0, v6: 0}
+
+  loop do
+    case s.wait receive: true
+    in :receive, r
+      s.add r
+    in r, v
+      h[v] += 1
+      break if h.all?{|k, v| v == RN}
+    end
+  end
+
+  h.sum{|k, v| v}
+} unless yjit_enabled? # http://ci.rvm.jp/results/trunk-yjit@ruby-sp2-docker/4466770
+
+# Selector should be GCed (free'ed) without trouble
+assert_equal 'ok', %q{
+  skip :ok unless defined? Ractor::Selector
+
+  RN = 30
+  rs = RN.times.map{
+    Ractor.new{ :v }
+  }
+  s = Ractor::Selector.new(*rs)
+  :ok
+}
+
+end # if !ENV['GITHUB_WORKFLOW']
+
+# Chilled strings are not shareable
+assert_equal 'false', %q{
+  Ractor.shareable?("chilled")
+}
+
+# Chilled strings can be made shareable
+assert_equal 'true', %q{
+  shareable = Ractor.make_shareable("chilled")
+  shareable == "chilled" && Ractor.shareable?(shareable)
+}
+
+# require in Ractor
+assert_equal 'true', %q{
+  Module.new do
+    def require feature
+      return Ractor._require(feature) unless Ractor.main?
+      super
+    end
+    Object.prepend self
+    set_temporary_name 'Ractor#require'
+  end
+
+  Ractor.new{
+    begin
+      require 'tempfile'
+      Tempfile.new
+    rescue SystemStackError
+      # prism parser with -O0 build consumes a lot of machine stack
+      Data.define(:fileno).new(1)
+    end
+  }.value.fileno > 0
+}
+
+# require_relative in Ractor
+assert_equal 'true', %q{
+  dummyfile = File.join(__dir__, "dummy#{rand}.rb")
+  return true if File.exist?(dummyfile)
+
   begin
-    Ractor.make_shareable(foo)
-  rescue Ractor::IsolationError
-    "ok"
+    File.write dummyfile, ''
+  rescue Exception
+    # skip on any errors
+    return true
+  end
+
+  begin
+    Ractor.new dummyfile do |f|
+      require_relative File.basename(f)
+    end.value
+  ensure
+    File.unlink dummyfile
   end
 }
 
-assert_equal "ok", %q{
-  def foo(**); ->{ super }; end
+# require_relative in Ractor
+assert_equal 'LoadError', %q{
+  dummyfile = File.join(__dir__, "not_existed_dummy#{rand}.rb")
+  return true if File.exist?(dummyfile)
+
+  Ractor.new dummyfile do |f|
+    begin
+      require_relative File.basename(f)
+    rescue LoadError => e
+      e.class
+    end
+  end.value
+}
+
+# autolaod in Ractor
+assert_equal 'true', %q{
+  autoload :Tempfile, 'tempfile'
+
+  r = Ractor.new do
+    begin
+      Tempfile.new
+    rescue SystemStackError
+      # prism parser with -O0 build consumes a lot of machine stack
+      Data.define(:fileno).new(1)
+    end
+  end
+  r.value.fileno > 0
+}
+
+# failed in autolaod in Ractor
+assert_equal 'LoadError', %q{
+  dummyfile = File.join(__dir__, "not_existed_dummy#{rand}.rb")
+  autoload :Tempfile, dummyfile
+
+  r = Ractor.new do
+    begin
+      Tempfile.new
+    rescue LoadError => e
+      e.class
+    end
+  end
+  r.value
+}
+
+# bind_call in Ractor [Bug #20934]
+assert_equal 'ok', %q{
+  2.times.map do
+    Ractor.new do
+      1000.times do
+        Object.instance_method(:itself).bind_call(self)
+      end
+    end
+  end.each(&:join)
+  GC.start
+  :ok.itself
+}
+
+# moved objects being corrupted if embeded (String)
+assert_equal 'ok', %q{
+  ractor = Ractor.new { Ractor.receive }
+  obj = "foobarbazfoobarbazfoobarbazfoobarbaz"
+  ractor.send(obj.dup, move: true)
+  roundtripped_obj = ractor.value
+  roundtripped_obj == obj ? :ok : roundtripped_obj
+}
+
+# moved objects being corrupted if embeded (Array)
+assert_equal 'ok', %q{
+  ractor = Ractor.new { Ractor.receive }
+  obj = Array.new(10, 42)
+  ractor.send(obj.dup, move: true)
+  roundtripped_obj = ractor.value
+  roundtripped_obj == obj ? :ok : roundtripped_obj
+}
+
+# moved objects being corrupted if embeded (Hash)
+assert_equal 'ok', %q{
+  ractor = Ractor.new { Ractor.receive }
+  obj = { foo: 1, bar: 2 }
+  ractor.send(obj.dup, move: true)
+  roundtripped_obj = ractor.value
+  roundtripped_obj == obj ? :ok : roundtripped_obj
+}
+
+# moved objects being corrupted if embeded (MatchData)
+assert_equal 'ok', %q{
+  ractor = Ractor.new { Ractor.receive }
+  obj = "foo".match(/o/)
+  ractor.send(obj.dup, move: true)
+  roundtripped_obj = ractor.value
+  roundtripped_obj == obj ? :ok : roundtripped_obj
+}
+
+# moved objects being corrupted if embeded (Struct)
+assert_equal 'ok', %q{
+  ractor = Ractor.new { Ractor.receive }
+  obj = Struct.new(:a, :b, :c, :d, :e, :f).new(1, 2, 3, 4, 5, 6)
+  ractor.send(obj.dup, move: true)
+  roundtripped_obj = ractor.value
+  roundtripped_obj == obj ? :ok : roundtripped_obj
+}
+
+# moved objects being corrupted if embeded (Object)
+assert_equal 'ok', %q{
+  ractor = Ractor.new { Ractor.receive }
+  class SomeObject
+    attr_reader :a, :b, :c, :d, :e, :f
+    def initialize
+      @a = @b = @c = @d = @e = @f = 1
+    end
+
+    def ==(o)
+      @a == o.a &&
+      @b == o.b &&
+      @c == o.c &&
+      @d == o.d &&
+      @e == o.e &&
+      @f == o.f
+    end
+  end
+
+  SomeObject.new # initial non-embeded
+
+  obj = SomeObject.new
+  ractor.send(obj.dup, move: true)
+  roundtripped_obj = ractor.value
+  roundtripped_obj == obj ? :ok : roundtripped_obj
+}
+
+# moved arrays can't be used
+assert_equal 'ok', %q{
+  ractor = Ractor.new { Ractor.receive }
+  obj = [1]
+  ractor.send(obj, move: true)
   begin
-    Ractor.make_shareable(foo)
-  rescue Ractor::IsolationError
-    "ok"
+    [].concat(obj)
+  rescue TypeError
+    :ok
+  else
+    :fail
   end
 }
 
-assert_equal "ok", %q{
-  def foo(...); ->{ super }; end
+# moved strings can't be used
+assert_equal 'ok', %q{
+  ractor = Ractor.new { Ractor.receive }
+  obj = "hello"
+  ractor.send(obj, move: true)
   begin
-    Ractor.make_shareable(foo)
-  rescue Ractor::IsolationError
-    "ok"
+    "".replace(obj)
+  rescue TypeError
+    :ok
+  else
+    :fail
   end
 }
 
-assert_equal "ok", %q{
-  def foo((x), (y)); ->{ super }; end
+# moved hashes can't be used
+assert_equal 'ok', %q{
+  ractor = Ractor.new { Ractor.receive }
+  obj = { a: 1 }
+  ractor.send(obj, move: true)
   begin
-    Ractor.make_shareable(foo([], []))
-  rescue Ractor::IsolationError
-    "ok"
+    {}.merge(obj)
+  rescue TypeError
+    :ok
+  else
+    :fail
   end
 }
 
-end # if !ENV['GITHUB_WORKFLOW']
+# move objects inside frozen containers
+assert_equal 'ok', %q{
+  ractor = Ractor.new { Ractor.receive }
+  obj = Array.new(10, 42)
+  original = obj.dup
+  ractor.send([obj].freeze, move: true)
+  roundtripped_obj = ractor.value[0]
+  roundtripped_obj == original ? :ok : roundtripped_obj
+}
+
+# move object with generic ivar
+assert_equal 'ok', %q{
+  ractor = Ractor.new { Ractor.receive }
+  obj = Array.new(10, 42)
+  obj.instance_variable_set(:@array, [1])
+
+  ractor.send(obj, move: true)
+  roundtripped_obj = ractor.value
+  roundtripped_obj.instance_variable_get(:@array) == [1] ? :ok : roundtripped_obj
+}
+
+# move object with many generic ivars
+assert_equal 'ok', %q{
+  ractor = Ractor.new { Ractor.receive }
+  obj = Array.new(10, 42)
+  0.upto(300) do |i|
+    obj.instance_variable_set(:"@array#{i}", [i])
+  end
+
+  ractor.send(obj, move: true)
+  roundtripped_obj = ractor.value
+  roundtripped_obj.instance_variable_get(:@array1) == [1] ? :ok : roundtripped_obj
+}
+
+# move object with complex generic ivars
+assert_equal 'ok', %q{
+  # Make Array too_complex
+  30.times { |i| [].instance_variable_set(:"@complex#{i}", 1) }
+
+  ractor = Ractor.new { Ractor.receive }
+  obj = Array.new(10, 42)
+  obj.instance_variable_set(:@array1, [1])
+
+  ractor.send(obj, move: true)
+  roundtripped_obj = ractor.value
+  roundtripped_obj.instance_variable_get(:@array1) == [1] ? :ok : roundtripped_obj
+}
+
+# move object with generic ivars and existing id2ref table
+# [Bug #21664]
+assert_equal 'ok', %q{
+  obj = [1]
+  obj.instance_variable_set("@field", :ok)
+  ObjectSpace._id2ref(obj.object_id) # build id2ref table
+
+  ractor = Ractor.new { Ractor.receive }
+  ractor.send(obj, move: true)
+  obj = ractor.value
+  obj.instance_variable_get("@field")
+}
+
+# copy object with complex generic ivars
+assert_equal 'ok', %q{
+  # Make Array too_complex
+  30.times { |i| [].instance_variable_set(:"@complex#{i}", 1) }
+
+  ractor = Ractor.new { Ractor.receive }
+  obj = Array.new(10, 42)
+  obj.instance_variable_set(:@array1, [1])
+
+  ractor.send(obj)
+  roundtripped_obj = ractor.value
+  roundtripped_obj.instance_variable_get(:@array1) == [1] ? :ok : roundtripped_obj
+}
+
+# copy object with many generic ivars
+assert_equal 'ok', %q{
+  ractor = Ractor.new { Ractor.receive }
+  obj = Array.new(10, 42)
+  0.upto(300) do |i|
+    obj.instance_variable_set(:"@array#{i}", [i])
+  end
+
+  ractor.send(obj)
+  roundtripped_obj = ractor.value
+  roundtripped_obj.instance_variable_get(:@array1) == [1] ? :ok : roundtripped_obj
+}
+
+# moved composite types move their non-shareable parts properly
+assert_equal 'ok', %q{
+  k, v = String.new("key"), String.new("value")
+  h = { k => v }
+  h.instance_variable_set("@b", String.new("b"))
+  a = [k,v]
+  o_singleton = Object.new
+  def o_singleton.a
+    @a
+  end
+  o_singleton.instance_variable_set("@a", String.new("a"))
+  class MyObject
+    attr_reader :a
+    def initialize(a)
+      @a = a
+    end
+  end
+  struct_class = Struct.new(:a)
+  struct = struct_class.new(String.new('a'))
+  o = MyObject.new(String.new('a'))
+  port = Ractor::Port.new
+
+  r = Ractor.new port do |port|
+    loop do
+      obj = Ractor.receive
+      val = case obj
+      when Hash
+        obj['key'] == 'value' && obj.instance_variable_get("@b") == 'b'
+      when Array
+        obj[0] == 'key'
+      when Struct
+        obj.a == 'a'
+      when Object
+        obj.a == 'a'
+      end
+      port << val
+    end
+  end
+
+  objs = [h, a, o_singleton, o, struct]
+  objs.each_with_index do |obj, i|
+    klass = obj.class
+    parts_moved = {}
+    case obj
+    when Hash
+      parts_moved[klass] = [obj['key'], obj.instance_variable_get("@b")]
+    when Array
+      parts_moved[klass] = obj.dup # the contents
+    when Struct, Object
+      parts_moved[klass] = [obj.a]
+    end
+    r.send(obj, move: true)
+    val = port.receive
+    if val != true
+      raise "bad val in ractor for obj at i:#{i}"
+    end
+    begin
+      p obj
+    rescue
+    else
+      raise "should be moved"
+    end
+    parts_moved.each do |klass, parts|
+      parts.each_with_index do |part, j|
+        case part
+        when Ractor::MovedObject
+        else
+          raise "part for class #{klass} at i:#{j} should be moved"
+        end
+      end
+    end
+  end
+  'ok'
+}
+
+# fork after creating Ractor
+assert_equal 'ok', %q{
+begin
+  Ractor.new { Ractor.receive }
+  _, status = Process.waitpid2 fork { }
+  status.success? ? "ok" : status
+rescue NotImplementedError
+  :ok
+end
+}
+
+# Ractors should be terminated after fork
+assert_equal 'ok', %q{
+begin
+  r = Ractor.new { Ractor.receive }
+  _, status = Process.waitpid2 fork {
+    begin
+      raise if r.value != nil
+    end
+  }
+  r.send(123)
+  raise unless r.value == 123
+  status.success? ? "ok" : status
+rescue NotImplementedError
+  :ok
+end
+}
+
+# Ractors should be terminated after fork
+assert_equal 'ok', %q{
+begin
+  r = Ractor.new { Ractor.receive }
+  _, status = Process.waitpid2 fork {
+    begin
+      r.send(123)
+    rescue Ractor::ClosedError
+    end
+  }
+  r.send(123)
+  raise unless r.value == 123
+  status.success? ? "ok" : status
+rescue NotImplementedError
+  :ok
+end
+}
+
+# Creating classes inside of Ractors
+# [Bug #18119]
+assert_equal 'ok', %q{
+  port = Ractor::Port.new
+  workers = (0...8).map do
+    Ractor.new port do |port|
+      loop do
+        100.times.map { Class.new }
+        port << nil
+      end
+    end
+  end
+
+  100.times { port.receive }
+
+  'ok'
+}
+
+# Using Symbol#to_proc inside ractors
+# [Bug #21354]
+assert_equal 'ok', %q{
+  :inspect.to_proc
+  Ractor.new do
+    # It should not use this cached proc, it should create a new one. If it used
+    # the cached proc, we would get a ractor_confirm_belonging error here.
+    :inspect.to_proc
+  end.join
+  'ok'
+}
+
+# take vm lock when deleting generic ivars from the global table
+assert_equal 'ok', %q{
+  Ractor.new do
+    a = [1, 2, 3]
+    a.object_id
+    a.dup # this deletes generic ivar on dupped object
+    'ok'
+  end.value
+}
+
+## Ractor#monitor
+
+# monitor port returns `:exited` when the monitering Ractor terminated.
+assert_equal 'true', %q{
+  r = Ractor.new do
+    Ractor.main << :ok1
+    :ok2
+  end
+
+  r.monitor port = Ractor::Port.new
+  Ractor.receive # :ok1
+  port.receive == :exited
+}
+
+# monitor port returns `:exited` even if the monitoring Ractor was terminated.
+assert_equal 'true', %q{
+  r = Ractor.new do
+    :ok
+  end
+
+  r.join # wait for r's terminateion
+
+  r.monitor port = Ractor::Port.new
+  port.receive == :exited
+}
+
+# monitor returns false if the monitoring Ractor was terminated.
+assert_equal 'false', %q{
+  r = Ractor.new do
+    :ok
+  end
+
+  r.join # wait for r's terminateion
+
+  r.monitor Ractor::Port.new
+}
+
+# monitor port returns `:aborted` when the monitering Ractor is aborted.
+assert_equal 'true', %q{
+  r = Ractor.new do
+    Ractor.main << :ok1
+    raise 'ok'
+  end
+
+  r.monitor port = Ractor::Port.new
+  Ractor.receive # :ok1
+  port.receive == :aborted
+}
+
+# monitor port returns `:aborted` even if the monitoring Ractor was aborted.
+assert_equal 'true', %q{
+  r = Ractor.new do
+    raise 'ok'
+  end
+
+  begin
+    r.join # wait for r's terminateion
+  rescue Ractor::RemoteError
+    # ignore
+  end
+
+  r.monitor port = Ractor::Port.new
+  port.receive == :aborted
+}
+
+## Ractor#join
+
+# Ractor#join returns self when the Ractor is terminated.
+assert_equal 'true', %q{
+  r = Ractor.new do
+    Ractor.receive
+  end
+
+  r << :ok
+  r.join
+  r.inspect in /terminated/
+} if false # TODO
+
+# Ractor#join raises RemoteError when the remote Ractor aborted with an exception
+assert_equal 'err', %q{
+  r = Ractor.new do
+    raise 'err'
+  end
+
+  begin
+    r.join
+  rescue Ractor::RemoteError => e
+    e.cause.message
+  end
+}
+
+## Ractor#value
+
+# Ractor#value returns the last expression even if it is unshareable
+assert_equal 'true', %q{
+  r = Ractor.new do
+    obj = [1, 2]
+    obj << obj.object_id
+  end
+
+  ret = r.value
+  ret == [1, 2, ret.object_id]
+}
+
+# Only one Ractor can call Ractor#value
+assert_equal '[["Only the successor ractor can take a value", 9], ["ok", 2]]', %q{
+  r = Ractor.new do
+    'ok'
+  end
+
+  RN = 10
+
+  rs = RN.times.map do
+    Ractor.new r do |r|
+      begin
+        Ractor.main << r.value
+        Ractor.main << r.value # this ractor can get same result
+      rescue Ractor::Error => e
+        Ractor.main << e.message
+      end
+    end
+  end
+
+  (RN+1).times.map{
+    Ractor.receive
+  }.tally.sort
+}
+
+# Cause lots of inline CC misses.
+assert_equal 'ok', <<~'RUBY'
+  class A; def test; 1 + 1; end; end
+  class B; def test; 1 + 1; end; end
+  class C; def test; 1 + 1; end; end
+  class D; def test; 1 + 1; end; end
+  class E; def test; 1 + 1; end; end
+  class F; def test; 1 + 1; end; end
+  class G; def test; 1 + 1; end; end
+
+  objs = [A.new, B.new, C.new, D.new, E.new, F.new, G.new].freeze
+
+  def call_test(obj)
+    obj.test
+  end
+
+  ractors = 7.times.map do
+    Ractor.new(objs) do |objs|
+      objs = objs.shuffle
+      100_000.times do
+        objs.each do |o|
+          call_test(o)
+        end
+      end
+    end
+  end
+  ractors.each(&:join)
+  :ok
+RUBY
+
+# This test checks that we do not trigger a GC when we have malloc with Ractor
+# locks. We cannot trigger a GC with Ractor locks because GC requires VM lock
+# and Ractor barrier. If another Ractor is waiting on this Ractor lock, then it
+# will deadlock because the other Ractor will never join the barrier.
+#
+# Creating Ractor::Port requires locking the Ractor and inserting into an
+# st_table, which can call malloc.
+assert_equal 'ok', <<~'RUBY'
+  r = Ractor.new do
+    loop do
+      Ractor::Port.new
+    end
+  end
+
+  10.times do
+    10_000.times do
+      r.send(nil)
+    end
+    sleep(0.01)
+  end
+  :ok
+RUBY
+
+assert_equal 'ok', <<~'RUBY'
+  begin
+    100.times do |i|
+      Ractor.new(i) do |j|
+        1000.times do |i|
+          "#{j}-#{i}"
+        end
+        Ractor.receive
+      end
+      pid = fork { }
+      _, status = Process.waitpid2 pid
+      raise unless status.success?
+    end
+
+    :ok
+  rescue NotImplementedError
+    :ok
+  end
+RUBY
+
+assert_equal 'ok', <<~'RUBY'
+  begin
+    100.times do |i|
+      Ractor.new(i) do |j|
+        1000.times do |i|
+          "#{j}-#{i}"
+        end
+      end
+      pid = fork do
+        GC.verify_internal_consistency
+      end
+      _, status = Process.waitpid2 pid
+      raise unless status.success?
+    end
+
+    :ok
+  rescue NotImplementedError
+    :ok
+  end
+RUBY
+
+# When creating bmethods in Ractors, they should only be usable from their
+# defining ractor, even if it is GC'd
+assert_equal 'ok', <<~'RUBY'
+
+begin
+  CLASSES = 1000.times.map { Class.new }.freeze
+
+  # This would be better to run in parallel, but there's a bug with lambda
+  # creation and YJIT causing crashes in dev mode
+  ractors = CLASSES.map do |klass|
+    Ractor.new(klass) do |klass|
+      Ractor.receive
+      klass.define_method(:foo) {}
+    end
+  end
+
+  ractors.each do |ractor|
+    ractor << nil
+    ractor.join
+  end
+
+  ractors.clear
+  GC.start
+
+  any = 1000.times.map do
+    Ractor.new do
+      CLASSES.any? do |klass|
+        begin
+          klass.new.foo
+          true
+        rescue RuntimeError
+          false
+        end
+      end
+    end
+  end.map(&:value).none? && :ok
+rescue ThreadError => e
+  # ignore limited memory machine
+  if /can\'t create Thread/ =~ e.message
+    :ok
+  else
+    raise
+  end
+end
+RUBY
diff --git a/bootstraptest/test_syntax.rb b/bootstraptest/test_syntax.rb
index 948e2d7809..fbc9c6f62e 100644
--- a/bootstraptest/test_syntax.rb
+++ b/bootstraptest/test_syntax.rb
@@ -528,24 +528,24 @@ assert_equal %q{1}, %q{
   i
 }
 def assert_syntax_error expected, code, message = ''
-  assert_equal "#{expected}",
-    "begin eval(%q{#{code}}, nil, '', 0)"'; rescue SyntaxError => e; e.message[/\A:(?:\d+:)? (.*)/, 1] end', message
+  assert_match /^#{Regexp.escape(expected)}/,
+    "begin eval(%q{#{code}}, nil, '', 0)"'; rescue SyntaxError => e; e.message[/(?:\^~*|\A:(?:\d+:)?(?! syntax errors? found)(?: syntax error,)?) (.*)/, 1] end', message
 end
 assert_syntax_error "unterminated string meets end of file", '().."', '[ruby-dev:29732]'
 assert_equal %q{[]}, %q{$&;[]}, '[ruby-dev:31068]'
-assert_syntax_error "syntax error, unexpected *, expecting '}'", %q{{*0}}, '[ruby-dev:31072]'
-assert_syntax_error "`@0' is not allowed as an instance variable name", %q{@0..0}, '[ruby-dev:31095]'
-assert_syntax_error "identifier $00 is not valid to get", %q{$00..0}, '[ruby-dev:31100]'
-assert_syntax_error "identifier $00 is not valid to set", %q{0..$00=1}
+assert_syntax_error "unexpected *, expecting '}'", %q{{*0}}, '[ruby-dev:31072]'
+assert_syntax_error "'@0' is not allowed as an instance variable name", %q{@0..0}, '[ruby-dev:31095]'
+assert_syntax_error "'$00' is not allowed as a global variable name", %q{$00..0}, '[ruby-dev:31100]'
+assert_syntax_error "'$00' is not allowed as a global variable name", %q{0..$00=1}
 assert_equal %q{0}, %q{[*0];0}, '[ruby-dev:31102]'
-assert_syntax_error "syntax error, unexpected ')'", %q{v0,(*,v1,) = 0}, '[ruby-dev:31104]'
+assert_syntax_error "unexpected ')'", %q{v0,(*,v1,) = 0}, '[ruby-dev:31104]'
 assert_equal %q{1}, %q{
   class << (ary=[]); def []; 0; end; def []=(x); super(0,x);end;end; ary[]+=1
 }, '[ruby-dev:31110]'
 assert_syntax_error "Can't set variable $1", %q{0..$1=1}, '[ruby-dev:31118]'
 assert_valid_syntax %q{1.times{1+(1&&next)}}, '[ruby-dev:31119]'
 assert_valid_syntax %q{x=-1;loop{x+=1&&redo if (x+=1).zero?}}, '[ruby-dev:31119]'
-assert_syntax_error %q{syntax error, unexpected end-of-input}, %q{!}, '[ruby-dev:31243]'
+assert_syntax_error %q{unexpected end-of-input}, %q{!}, '[ruby-dev:31243]'
 assert_equal %q{[nil]}, %q{[()]}, '[ruby-dev:31252]'
 assert_equal %q{true}, %q{!_=()}, '[ruby-dev:31263]'
 assert_equal 'ok', %q{while true; redo; end if 1 == 2; :ok}, '[ruby-dev:31360]'
@@ -629,7 +629,7 @@ assert_equal '2', %q{
 
 assert_match /invalid multibyte char/, %q{
   $stderr = STDOUT
-  eval("\"\xf0".force_encoding("utf-8"))
+  eval("\"\xf0".dup.force_encoding("utf-8"))
 }, '[ruby-dev:32429]'
 
 # method ! and !=
@@ -904,3 +904,35 @@ assert_normal_exit %q{
     Class
   end
 }, '[ruby-core:30293]'
+
+assert_equal "false", <<~RUBY, "literal strings are mutable", "--disable-frozen-string-literal"
+  'test'.frozen?
+RUBY
+
+assert_equal "true", <<~RUBY, "literal strings are frozen", "--disable-frozen-string-literal", frozen_string_literal: true
+  'test'.frozen?
+RUBY
+
+assert_equal "true", <<~RUBY, "literal strings are frozen", "--enable-frozen-string-literal"
+  'test'.frozen?
+RUBY
+
+assert_equal "false", <<~RUBY, "literal strings are mutable", "--enable-frozen-string-literal", frozen_string_literal: false
+  'test'.frozen?
+RUBY
+
+assert_equal "false", <<~RUBY, "__FILE__ is mutable", "--disable-frozen-string-literal"
+  __FILE__.frozen?
+RUBY
+
+assert_equal "true", <<~RUBY, "__FILE__ is frozen", "--disable-frozen-string-literal", frozen_string_literal: true
+  __FILE__.frozen?
+RUBY
+
+assert_equal "true", <<~RUBY, "__FILE__ is frozen", "--enable-frozen-string-literal"
+  __FILE__.frozen?
+RUBY
+
+assert_equal "false", <<~RUBY, "__FILE__ is mutable", "--enable-frozen-string-literal", frozen_string_literal: false
+  __FILE__.frozen?
+RUBY
diff --git a/bootstraptest/test_thread.rb b/bootstraptest/test_thread.rb
index 5361828403..7ff5bb4a38 100644
--- a/bootstraptest/test_thread.rb
+++ b/bootstraptest/test_thread.rb
@@ -242,9 +242,22 @@ assert_equal 'true', %{
   end
 }
 
+assert_equal 'true', %{
+  Thread.new{}.join
+  begin
+    Process.waitpid2 fork{
+      Thread.new{
+        sleep 0.1
+      }.join
+    }
+    true
+  rescue NotImplementedError
+    true
+  end
+}
+
 assert_equal 'ok', %{
-  open("zzz_t1.rb", "w") do |f|
-    f.puts <<-END
+  File.write("zzz_t1.rb", <<-END)
       begin
         Thread.new { fork { GC.start } }.join
         pid, status = Process.wait2
@@ -253,7 +266,6 @@ assert_equal 'ok', %{
         $result = :ok
       end
     END
-  end
   require "./zzz_t1.rb"
   $result
 }
@@ -408,8 +420,7 @@ assert_equal 'ok', %q{
 }
 
 assert_equal 'ok', %{
-  open("zzz_t2.rb", "w") do |f|
-    f.puts <<-'end;' # do
+  File.write("zzz_t2.rb", <<-'end;') # do
       begin
         m = Thread::Mutex.new
         parent = Thread.current
@@ -431,7 +442,6 @@ assert_equal 'ok', %{
         $result = :ok
       end
     end;
-  end
   require "./zzz_t2.rb"
   $result
 }
@@ -484,6 +494,7 @@ assert_equal 'foo', %q{
   GC.start
   f.call.source
 }
+
 assert_normal_exit %q{
   class C
     def inspect
diff --git a/bootstraptest/test_yjit.rb b/bootstraptest/test_yjit.rb
index b0c17229c5..be66395190 100644
--- a/bootstraptest/test_yjit.rb
+++ b/bootstraptest/test_yjit.rb
@@ -1,3 +1,338 @@
+# To run the tests in this file only, with YJIT enabled:
+# make btest BTESTS=bootstraptest/test_yjit.rb RUN_OPTS="--yjit-call-threshold=1"
+
+# regression test for popping before side exit
+assert_equal "ok", %q{
+  def foo(a, *) = a
+
+  def call(args, &)
+    foo(1) # spill at where the block arg will be
+    foo(*args, &)
+  end
+
+  call([1, 2])
+
+  begin
+    call([])
+  rescue ArgumentError
+    :ok
+  end
+}
+
+# regression test for send processing before side exit
+assert_equal "ok", %q{
+  def foo(a, *) = :foo
+
+  def call(args)
+    send(:foo, *args)
+  end
+
+  call([1, 2])
+
+  begin
+    call([])
+  rescue ArgumentError
+    :ok
+  end
+}
+
+# test discarding extra yield arguments
+assert_equal "22131300500015901015", %q{
+  def splat_kw(ary) = yield *ary, a: 1
+
+  def splat(ary) = yield *ary
+
+  def kw = yield 1, 2, a: 3
+
+  def kw_only = yield a: 0
+
+  def simple = yield 0, 1
+
+  def none = yield
+
+  def calls
+    [
+      splat([1, 1, 2]) { |x, y| x + y },
+      splat([1, 1, 2]) { |y, opt = raise| opt + y},
+      splat_kw([0, 1]) { |a:| a },
+      kw { |a:| a },
+      kw { |one| one },
+      kw { |one, a:| a },
+      kw_only { |a:| a },
+      kw_only { |a: 1| a },
+      simple { 5.itself },
+      simple { |a| a },
+      simple { |opt = raise| opt },
+      simple { |*rest| rest },
+      simple { |opt_kw: 5| opt_kw },
+      none { |a: 9| a },
+      # autosplat ineractions
+      [0, 1, 2].yield_self { |a, b| [a, b] },
+      [0, 1, 2].yield_self { |a, opt = raise| [a, opt] },
+      [1].yield_self { |a, opt = 4| a + opt },
+    ]
+  end
+
+  calls.join
+}
+
+# test autosplat with empty splat
+assert_equal "ok", %q{
+  def m(pos, splat) = yield pos, *splat
+
+  m([:ok], []) {|v0,| v0 }
+}
+
+# regression test for send stack shifting
+assert_normal_exit %q{
+  def foo(a, b)
+    a.singleton_methods(b)
+  end
+
+  def call_foo
+    [1, 1, 1, 1, 1, 1, send(:foo, 1, 1)]
+  end
+
+  call_foo
+}
+
+# regression test for keyword splat with yield
+assert_equal 'nil', %q{
+  def splat_kw(kwargs) = yield(**kwargs)
+
+  splat_kw({}) { _1 }.inspect
+}
+
+# regression test for arity check with splat
+assert_equal '[:ae, :ae]', %q{
+  def req_one(a_, b_ = 1) = raise
+
+  def test(args)
+    req_one *args
+  rescue ArgumentError
+    :ae
+  end
+
+  [test(Array.new 5), test([])]
+}
+
+# regression test for arity check with splat and send
+assert_equal '[:ae, :ae]', %q{
+  def two_reqs(a, b_, _ = 1) = a.gsub(a, a)
+
+  def test(name, args)
+    send(name, *args)
+  rescue ArgumentError
+    :ae
+  end
+
+  [test(:two_reqs, ["g", nil, nil, nil]), test(:two_reqs, ["g"])]
+}
+
+# regression test for GC marking stubs in invalidated code
+assert_normal_exit %q{
+  skip true unless GC.respond_to?(:compact)
+  garbage = Array.new(10_000) { [] } # create garbage to cause iseq movement
+  eval(<<~RUBY)
+  def foo(n, garbage)
+    if n == 2
+      # 1.times.each to create a cfunc frame to preserve the JIT frame
+      # which will return to a stub housed in an invalidated block
+      return 1.times.each do
+        Object.define_method(:foo) {}
+        garbage.clear
+        GC.verify_compaction_references(toward: :empty, expand_heap: true)
+      end
+    end
+
+    foo(n + 1, garbage)
+  end
+  RUBY
+
+  foo(1, garbage)
+}
+
+# regression test for callee block handler overlapping with arguments
+assert_equal '3', %q{
+  def foo(_req, *args) = args.last
+
+  def call_foo = foo(0, 1, 2, 3, &->{})
+
+  call_foo
+}
+
+# call leaf builtin with a block argument
+assert_equal '0', "0.abs(&nil)"
+
+# regression test for invokeblock iseq guard
+assert_equal 'ok', %q{
+  skip :ok unless GC.respond_to?(:compact)
+  def foo = yield
+  10.times do |i|
+    ret = eval("foo { #{i} }")
+    raise "failed at #{i}" unless ret == i
+    GC.compact
+  end
+  :ok
+}
+
+# regression test for overly generous guard elision
+assert_equal '[0, :sum, 0, :sum]', %q{
+  # In faulty versions, the following happens:
+  #  1. YJIT puts object on the temp stack with type knowledge
+  #     (CArray or CString) about RBASIC_CLASS(object).
+  #  2. In iter=0, due to the type knowledge, YJIT generates
+  #     a call to sum() without any guard on RBASIC_CLASS(object).
+  #  3. In iter=1, a singleton class is added to the object,
+  #     changing RBASIC_CLASS(object), falsifying the type knowledge.
+  #  4. Because the code from (1) has no class guard, it is incorrectly
+  #     reused and the wrong method is invoked.
+  # Putting a literal is important for gaining type knowledge.
+  def carray(iter)
+    array = []
+    array.sum(iter.times { def array.sum(_) = :sum })
+  end
+
+  def cstring(iter)
+    string = "".dup
+    string.sum(iter.times { def string.sum(_) = :sum })
+  end
+
+  [carray(0), carray(1), cstring(0), cstring(1)]
+}
+
+# regression test for return type of Integer#/
+# It can return a T_BIGNUM when inputs are T_FIXNUM.
+assert_equal 0x3fffffffffffffff.to_s, %q{
+  def call(fixnum_min)
+    (fixnum_min / -1) - 1
+  end
+
+  call(-(2**62))
+}
+
+# regression test for return type of String#<<
+assert_equal 'Sub', %q{
+  def call(sub) = (sub << sub).itself
+
+  class Sub < String; end
+
+  call(Sub.new('o')).class
+}
+
+# String#dup with generic ivars
+assert_equal '["str", "ivar"]', %q{
+  def str_dup(str) = str.dup
+  str = "str"
+  str.instance_variable_set(:@ivar, "ivar")
+  str = str_dup(str)
+  [str, str.instance_variable_get(:@ivar)]
+}
+
+# test splat filling required and feeding rest
+assert_equal '[0, 1, 2, [3, 4]]', %q{
+  public def lead_rest(a, b, *rest)
+    [self, a, b, rest]
+  end
+
+  def call(args) = 0.lead_rest(*args)
+
+  call([1, 2, 3, 4])
+}
+
+# test missing opts are nil initialized
+assert_equal '[[0, 1, nil, 3], [0, 1, nil, 3], [0, 1, nil, 3, []], [0, 1, nil, 3, []]]', %q{
+  public def lead_opts(a, b=binding.local_variable_get(:c), c=3)
+    [self, a, b, c]
+  end
+
+  public def opts_rest(a=raise, b=binding.local_variable_get(:c), c=3, *rest)
+    [self, a, b, c, rest]
+  end
+
+  def call(args)
+    [
+      0.lead_opts(1),
+      0.lead_opts(*args),
+
+      0.opts_rest(1),
+      0.opts_rest(*args),
+    ]
+  end
+
+  call([1])
+}
+
+# test filled optionals with unspecified keyword param
+assert_equal 'ok', %q{
+  def opt_rest_opt_kw(_=1, *, k: :ok) = k
+
+  def call = opt_rest_opt_kw(0)
+
+  call
+}
+
+# test splat empty array with rest param
+assert_equal '[0, 1, 2, []]', %q{
+  public def foo(a=1, b=2, *rest)
+    [self, a, b, rest]
+  end
+
+  def call(args) = 0.foo(*args)
+
+  call([])
+}
+
+# Regression test for yielding with autosplat to block with
+# optional parameters. https://github.com/Shopify/yjit/issues/313
+assert_equal '[:a, :b, :a, :b]', %q{
+  def yielder(arg) = yield(arg) + yield(arg)
+
+  yielder([:a, :b]) do |c = :c, d = :d|
+    [c, d]
+  end
+}
+
+# Regression test for GC mishap while doing shape transition
+assert_equal '[:ok]', %q{
+  # [Bug #19601]
+  class RegressionTest
+    def initialize
+      @a = @b = @fourth_ivar_does_shape_transition = nil
+    end
+
+    def extender
+      @first_extended_ivar = [:ok]
+    end
+  end
+
+  GC.stress = true
+
+  # Used to crash due to GC run in rb_ensure_iv_list_size()
+  # not marking the newly allocated [:ok].
+  RegressionTest.new.extender.itself
+}
+
+assert_equal 'true', %q{
+  # regression test for tracking type of locals for too long
+  def local_setting_cmp(five)
+    victim = 5
+    five.define_singleton_method(:respond_to?) do |_, _|
+      victim = nil
+    end
+
+    # +1 makes YJIT track that victim is a number and
+    # defined? calls respond_to? from above indirectly
+    unless (victim + 1) && defined?(five.something)
+      # Would return wrong result if we still think `five` is a number
+      victim.nil?
+    end
+  end
+
+  local_setting_cmp(Object.new)
+  local_setting_cmp(Object.new)
+}
+
 assert_equal '18374962167983112447', %q{
   # regression test for incorrectly discarding 32 bits of a pointer when it
   # comes to default values.
@@ -14,7 +349,7 @@ assert_equal '18374962167983112447', %q{
 }
 
 assert_normal_exit %q{
-  # regression test for a leak caught by an asert on --yjit-call-threshold=2
+  # regression test for a leak caught by an assert on --yjit-call-threshold=2
   Foo = 1
 
   eval("def foo = [#{(['Foo,']*256).join}]")
@@ -25,6 +360,29 @@ assert_normal_exit %q{
   Object.send(:remove_const, :Foo)
 }
 
+assert_normal_exit %q{
+  # Test to ensure send on overridden c functions
+  # doesn't corrupt the stack
+  class Bar
+    def bar(x)
+      x
+    end
+  end
+
+  class Foo
+    def bar
+      Bar.new
+    end
+  end
+
+  foo = Foo.new
+  # before this change, this line would error
+  # because "s" would still be on the stack
+  # String.to_s is the overridden method here
+  p foo.bar.bar("s".__send__(:to_s))
+}
+
+
 assert_equal '[nil, nil, nil, nil, nil, nil]', %q{
   [NilClass, TrueClass, FalseClass, Integer, Float, Symbol].each do |klass|
     klass.class_eval("def foo = @foo")
@@ -36,88 +394,77 @@ assert_equal '[nil, nil, nil, nil, nil, nil]', %q{
   end
 }
 
-assert_equal '0', %q{
-  # This is a regression test for incomplete invalidation from
-  # opt_setinlinecache. This test might be brittle, so
-  # feel free to remove it in the future if it's too annoying.
-  # This test assumes --yjit-call-threshold=2.
-  module M
-    Foo = 1
-    def foo
-      Foo
-    end
-
-    def pin_self_type_then_foo
-      _ = @foo
-      foo
-    end
-
-    def only_ints
-      1 + self
-      foo
-    end
-  end
-
-  class Integer
-    include M
+assert_equal '[nil, nil, nil, nil, nil, nil]', %q{
+  # Tests defined? on non-heap objects
+  [NilClass, TrueClass, FalseClass, Integer, Float, Symbol].each do |klass|
+    klass.class_eval("def foo = defined?(@foo)")
   end
 
-  class Sub
-    include M
+  [nil, true, false, 0xFABCAFE, 0.42, :cake].map do |instance|
+    instance.foo
+    instance.foo
   end
+}
 
-  foo_method = M.instance_method(:foo)
+assert_equal '[nil, "instance-variable", nil, "instance-variable"]', %q{
+  # defined? on object that changes shape between calls
+  class Foo
+    def foo
+      defined?(@foo)
+    end
 
-  dbg = ->(message) do
-    return # comment this out to get printouts
+    def add
+      @foo = 1
+    end
 
-    $stderr.puts RubyVM::YJIT.disasm(foo_method)
-    $stderr.puts message
+    def remove
+      self.remove_instance_variable(:@foo)
+    end
   end
 
-  2.times { 42.only_ints }
-
-  dbg["There should be two versions of getinlineache"]
-
-  module M
-    remove_const(:Foo)
-  end
+  obj = Foo.new
+  [obj.foo, (obj.add; obj.foo), (obj.remove; obj.foo), (obj.add; obj.foo)]
+}
 
-  dbg["There should be no getinlinecaches"]
+assert_equal '["instance-variable", 5]', %q{
+  # defined? on object too complex for shape information
+  class Foo
+    def initialize
+      100.times { |i| instance_variable_set("@foo#{i}", i) }
+    end
 
-  2.times do
-    42.only_ints
-  rescue NameError => err
-    _ = "caught name error #{err}"
+    def foo
+      [defined?(@foo5), @foo5]
+    end
   end
 
-  dbg["There should be one version of getinlineache"]
-
-  2.times do
-    Sub.new.pin_self_type_then_foo
-  rescue NameError
-    _ = 'second specialization'
-  end
+  Foo.new.foo
+}
 
-  dbg["There should be two versions of getinlineache"]
+# getinstancevariable with shape too complex
+assert_normal_exit %q{
+  class Foo
+    def initialize
+      @a = 1
+    end
 
-  module M
-    Foo = 1
+    def getter
+      @foobar
+    end
   end
 
-  dbg["There should still be two versions of getinlineache"]
-
-  42.only_ints
+  # Initialize ivars in changing order, making the Foo
+  # class have shape too complex
+  100.times do |x|
+    foo = Foo.new
+    foo.instance_variable_set(:"@a#{x}", 1)
+    foo.instance_variable_set(:"@foobar", 777)
 
-  dbg["There should be no getinlinecaches"]
-
-  # Find name of the first VM instruction in M#foo.
-  insns = RubyVM::InstructionSequence.of(foo_method).to_a
-  if defined?(RubyVM::YJIT.blocks_for) && (insns.last.find { Array === _1 }&.first == :opt_getinlinecache)
-    RubyVM::YJIT.blocks_for(RubyVM::InstructionSequence.of(foo_method))
-      .filter { _1.iseq_start_index == 0 }.count
-  else
-    0 # skip the test
+    # The getter method eventually sees shape too complex
+    r = foo.getter
+    if r != 777
+      raise "error"
+    end
   end
 }
 
@@ -178,6 +525,8 @@ assert_equal 'string', %q{
 
 # Check that exceptions work when getting global variable
 assert_equal 'rescued', %q{
+  Warning[:deprecated] = true
+
   module Warning
     def warn(message)
       raise
@@ -331,6 +680,45 @@ assert_equal 'false', %q{
   less_than 2
 }
 
+# BOP redefinition works on Integer#<=
+assert_equal 'false', %q{
+  def le(x, y) = x <= y
+
+  le(2, 2)
+
+  class Integer
+    def <=(_) = false
+  end
+
+  le(2, 2)
+}
+
+# BOP redefinition works on Integer#>
+assert_equal 'false', %q{
+  def gt(x, y) = x > y
+
+  gt(3, 2)
+
+  class Integer
+    def >(_) = false
+  end
+
+  gt(3, 2)
+}
+
+# BOP redefinition works on Integer#>=
+assert_equal 'false', %q{
+  def ge(x, y) = x >= y
+
+  ge(2, 2)
+
+  class Integer
+    def >=(_) = false
+  end
+
+  ge(2, 2)
+}
+
 # Putobject, less-than operator, fixnums
 assert_equal '2', %q{
     def check_index(index)
@@ -774,6 +1162,7 @@ assert_equal 'special', %q{
 
 # Test that object references in generated code get marked and moved
 assert_equal "good", %q{
+  skip :good unless GC.respond_to?(:compact)
   def bar
     "good"
   end
@@ -786,7 +1175,7 @@ assert_equal "good", %q{
   foo
 
   begin
-    GC.verify_compaction_references(double_heap: true, toward: :empty)
+    GC.verify_compaction_references(expand_heap: true, toward: :empty)
   rescue NotImplementedError
     # in case compaction isn't supported
   end
@@ -797,7 +1186,7 @@ assert_equal "good", %q{
 # Test polymorphic getinstancevariable. T_OBJECT -> T_STRING
 assert_equal 'ok', %q{
   @hello = @h1 = @h2 = @h3 = @h4 = 'ok'
-  str = ""
+  str = +""
   str.instance_variable_set(:@hello, 'ok')
 
   public def get
@@ -941,6 +1330,18 @@ assert_equal '[42, :default]', %q{
   ]
 }
 
+# Test default value block for Hash
+assert_equal "false", <<~RUBY, frozen_string_literal: false
+  def index_with_string(h)
+    h["foo"]
+  end
+
+  h = Hash.new { |h, k| k.frozen? }
+
+  index_with_string(h)
+  index_with_string(h)
+RUBY
+
 # A regression test for making sure cfp->sp is proper when
 # hitting stubs. See :stub-sp-flush:
 assert_equal 'ok', %q{
@@ -1098,6 +1499,38 @@ assert_equal '42', %q{
   run
 }
 
+# splatting an empty array on a specialized method
+assert_equal 'ok', %q{
+  def run
+    "ok".to_s(*[])
+  end
+
+  run
+  run
+}
+
+# splatting an single element array on a specialized method
+assert_equal '[1]', %q{
+  def run
+    [].<<(*[1])
+  end
+
+  run
+  run
+}
+
+# specialized method with wrong args
+assert_equal 'ok', %q{
+  def run(x)
+    "bad".to_s(123) if x
+  rescue
+    :ok
+  end
+
+  run(false)
+  run(true)
+}
+
 # getinstancevariable on Symbol
 assert_equal '[nil, nil]', %q{
   # @foo to exercise the getinstancevariable instruction
@@ -1204,6 +1637,19 @@ assert_equal '[1, 2, 42]', %q{
   [foo {1}, foo {2}, foo {42}]
 }
 
+# test calling without block param
+assert_equal '[1, false, 2, false]', %q{
+  def bar
+    block_given? && yield
+  end
+
+  def foo(&block)
+    bar(&block)
+  end
+
+  [foo { 1 }, foo, foo { 2 }, foo]
+}
+
 # test calling block param failing
 assert_equal '42', %q{
   def foo(&block)
@@ -1284,7 +1730,7 @@ assert_equal '{}', %q{
 }
 
 # test building hash with values
-assert_equal '{:foo=>:bar}', %q{
+assert_equal '{foo: :bar}', %q{
   def build_hash(val)
     { foo: val }
   end
@@ -1337,6 +1783,46 @@ assert_equal 'foo123', %q{
   make_str("foo", 123)
 }
 
+# test that invalidation of String#to_s doesn't crash
+assert_equal 'meh', %q{
+  def inval_method
+    "".to_s
+  end
+
+  inval_method
+
+  class String
+    def to_s
+      "meh"
+    end
+  end
+
+  inval_method
+}
+
+# test that overriding to_s on a String subclass works consistently
+assert_equal 'meh', %q{
+  class MyString < String
+    def to_s
+      "meh"
+    end
+  end
+
+  def test_to_s(obj)
+    obj.to_s
+  end
+
+  OBJ = MyString.new
+
+  # Should return '' both times
+  test_to_s("")
+  test_to_s("")
+
+  # Can return '' if YJIT optimises String#to_s too aggressively
+  test_to_s(OBJ)
+  test_to_s(OBJ)
+}
+
 # test string interpolation with overridden to_s
 assert_equal 'foo', %q{
   class String
@@ -1353,6 +1839,228 @@ assert_equal 'foo', %q{
   make_str("foo")
 }
 
+# Test that String unary plus returns the same object ID for an unfrozen string.
+assert_equal 'true', <<~RUBY, frozen_string_literal: false
+  def jittable_method
+    str = "bar"
+
+    old_obj_id = str.object_id
+    uplus_str = +str
+
+    uplus_str.object_id == old_obj_id
+  end
+  jittable_method
+RUBY
+
+# Test that String unary plus returns a different unfrozen string when given a frozen string
+assert_equal 'false', %q{
+  # Logic needs to be inside an ISEQ, such as a method, for YJIT to compile it
+  def jittable_method
+    frozen_str = "foo".freeze
+
+    old_obj_id = frozen_str.object_id
+    uplus_str = +frozen_str
+
+    uplus_str.object_id == old_obj_id || uplus_str.frozen?
+  end
+
+  jittable_method
+}
+
+# String-subclass objects should behave as expected inside string-interpolation via concatstrings
+assert_equal 'monkeys / monkeys, yo!', %q{
+  class MyString < String
+    # This is a terrible idea in production code, but we'd like YJIT to match CRuby
+    def to_s
+      super + ", yo!"
+    end
+  end
+
+  def jittable_method
+    m = MyString.new('monkeys')
+    "#{m} / #{m.to_s}"
+  end
+
+  jittable_method
+}
+
+# String-subclass objects should behave as expected for string equality
+assert_equal 'false', %q{
+  class MyString < String
+    # This is a terrible idea in production code, but we'd like YJIT to match CRuby
+    def ==(b)
+      "#{self}_" == b
+    end
+  end
+
+  def jittable_method
+    ma = MyString.new("a")
+
+    # Check equality with string-subclass receiver
+    ma == "a" || ma != "a_" ||
+      # Check equality with string receiver
+      "a_" == ma || "a" != ma ||
+      # Check equality between string subclasses
+      ma != MyString.new("a_") ||
+      # Make sure "string always equals itself" check isn't used with overridden equality
+      ma == ma
+  end
+  jittable_method
+}
+
+# Test to_s duplicates a string subclass object but not a string
+assert_equal 'false', %q{
+  class MyString < String; end
+
+  def jittable_method
+    a = "a"
+    ma = MyString.new("a")
+
+    a.object_id != a.to_s.object_id ||
+      ma.object_id == ma.to_s.object_id
+  end
+  jittable_method
+}
+
+# Test freeze on string subclass
+assert_equal 'true', %q{
+  class MyString < String; end
+
+  def jittable_method
+    fma = MyString.new("a").freeze
+
+    # Freezing a string subclass should not duplicate it
+    fma.object_id == fma.freeze.object_id
+  end
+  jittable_method
+}
+
+# Test unary minus on string subclass
+assert_equal 'true', %q{
+  class MyString < String; end
+
+  def jittable_method
+    ma = MyString.new("a")
+    fma = MyString.new("a").freeze
+
+    # Unary minus on frozen string subclass should not duplicate it
+    fma.object_id == (-fma).object_id &&
+      # Unary minus on unfrozen string subclass should duplicate it
+      ma.object_id != (-ma).object_id
+  end
+  jittable_method
+}
+
+# Test unary plus on string subclass
+assert_equal 'true', %q{
+  class MyString < String; end
+
+  def jittable_method
+    fma = MyString.new("a").freeze
+
+    # Unary plus on frozen string subclass should not duplicate it
+    fma.object_id != (+fma).object_id
+  end
+  jittable_method
+}
+
+# test getbyte on string class
+assert_equal '[97, :nil, 97, :nil, :raised]', %q{
+  def getbyte(s, i)
+   byte = begin
+    s.getbyte(i)
+   rescue TypeError
+    :raised
+   end
+
+   byte || :nil
+  end
+
+  getbyte("a", 0)
+  getbyte("a", 0)
+
+  [getbyte("a", 0), getbyte("a", 1), getbyte("a", -1), getbyte("a", -2), getbyte("a", "a")]
+}
+
+# Basic test for String#setbyte
+assert_equal 'AoZ', %q{
+  s = +"foo"
+  s.setbyte(0, 65)
+  s.setbyte(-1, 90)
+  s
+}
+
+# String#setbyte IndexError
+assert_equal 'String#setbyte', %q{
+  def ccall = "".setbyte(1, 0)
+  begin
+    ccall
+  rescue => e
+    e.backtrace.first.split("'").last
+  end
+}
+
+# String#setbyte TypeError
+assert_equal 'String#setbyte', %q{
+  def ccall = "".setbyte(nil, 0)
+  begin
+    ccall
+  rescue => e
+    e.backtrace.first.split("'").last
+  end
+}
+
+# String#setbyte FrozenError
+assert_equal 'String#setbyte', %q{
+  def ccall = "a".freeze.setbyte(0, 0)
+  begin
+    ccall
+  rescue => e
+    e.backtrace.first.split("'").last
+  end
+}
+
+# non-leaf String#setbyte
+assert_equal 'String#setbyte', %q{
+  def to_int
+    @caller = caller
+    0
+  end
+
+  def ccall = "a".dup.setbyte(self, 98)
+  ccall
+
+  @caller.first.split("'").last
+}
+
+# non-leaf String#byteslice
+assert_equal 'TypeError', %q{
+  def ccall = "".byteslice(nil, nil)
+  begin
+    ccall
+  rescue => e
+    e.class
+  end
+}
+
+# Test << operator on string subclass
+assert_equal 'abab', %q{
+  class MyString < String; end
+
+  def jittable_method
+    a = -"a"
+    mb = MyString.new("b")
+
+    buf = String.new
+    mbuf = MyString.new
+
+    buf << a << mb
+    mbuf << a << mb
+
+    buf + mbuf
+  end
+  jittable_method
+}
 
 # test invokebuiltin as used in struct assignment
 assert_equal '123', %q{
@@ -1480,6 +2188,34 @@ assert_equal '7', %q{
   foo(5,2)
 }
 
+# regression test for argument registers with invalidation
+assert_equal '[0, 1, 2]', %q{
+  def test(n)
+    ret = n
+    binding
+    ret
+  end
+
+  [0, 1, 2].map do |n|
+    test(n)
+  end
+}
+
+# regression test for argument registers
+assert_equal 'true', %q{
+  class Foo
+    def ==(other)
+      other == nil
+    end
+  end
+
+  def test
+    [Foo.new].include?(Foo.new)
+  end
+
+  test
+}
+
 # test pattern matching
 assert_equal '[:ok, :ok]', %q{
   class C
@@ -1545,6 +2281,20 @@ assert_equal '123', %q{
   foo(Foo)
 }
 
+# Test EP == BP invalidation with moving ISEQs
+assert_equal 'ok', %q{
+  skip :ok unless GC.respond_to?(:compact)
+  def entry
+    ok = proc { :ok } # set #entry as an EP-escaping ISEQ
+    [nil].reverse_each do # avoid exiting the JIT frame on the constant
+      GC.compact # move #entry ISEQ
+    end
+    ok # should be read off of escaped EP
+  end
+
+  entry.call
+}
+
 # invokesuper edge case
 assert_equal '[:A, [:A, :B]]', %q{
   class B
@@ -1701,6 +2451,50 @@ assert_equal '[:A, :Btwo]', %q{
   ins.foo
 }
 
+# invokesuper with a block
+assert_equal 'true', %q{
+  class A
+    def foo = block_given?
+  end
+
+  class B < A
+    def foo = super()
+  end
+
+  B.new.foo { }
+  B.new.foo { }
+}
+
+# invokesuper in a block
+assert_equal '[0, 2]', %q{
+  class A
+    def foo(x) = x * 2
+  end
+
+  class B < A
+    def foo
+      2.times.map do |x|
+        super(x)
+      end
+    end
+  end
+
+  B.new.foo
+  B.new.foo
+}
+
+# invokesuper zsuper in a bmethod
+assert_equal 'ok', %q{
+  class Foo
+    define_method(:itself) { super }
+  end
+  begin
+    Foo.new.itself
+  rescue RuntimeError
+    :ok
+  end
+}
+
 # Call to fixnum
 assert_equal '[true, false]', %q{
   def is_odd(obj)
@@ -1741,6 +2535,16 @@ assert_equal '[true, false, true, false]', %q{
   [is_odd(123), is_odd(456), is_odd(bignum), is_odd(bignum+1)]
 }
 
+# Flonum and Flonum
+assert_equal '[2.0, 0.0, 1.0, 4.0]', %q{
+  [1.0 + 1.0, 1.0 - 1.0, 1.0 * 1.0, 8.0 / 2.0]
+}
+
+# Flonum and Fixnum
+assert_equal '[2.0, 0.0, 1.0, 4.0]', %q{
+  [1.0 + 1, 1.0 - 1, 1.0 * 1, 8.0 / 2]
+}
+
 # Call to static and dynamic symbol
 assert_equal 'bar', %q{
   def to_string(obj)
@@ -1781,6 +2585,30 @@ assert_equal '[1, 2, 3, 4, 5]', %q{
   splatarray
 }
 
+# splatkw
+assert_equal '[1, 2]', %q{
+  def foo(a:) = [a, yield]
+
+  def entry(&block)
+    a = { a: 1 }
+    foo(**a, &block)
+  end
+
+  entry { 2 }
+}
+assert_equal '[1, 2]', %q{
+  def foo(a:) = [a, yield]
+
+  def entry(obj, &block)
+    foo(**obj, &block)
+  end
+
+  entry({ a: 3 }) { 2 }
+  obj = Object.new
+  def obj.to_hash = { a: 1 }
+  entry(obj) { 2 }
+}
+
 assert_equal '[1, 1, 2, 1, 2, 3]', %q{
   def expandarray
     arr = [1, 2, 3]
@@ -1835,6 +2663,39 @@ assert_equal '[:not_array, nil, nil]', %q{
   expandarray_not_array(obj)
 }
 
+assert_equal '[1, 2]', %q{
+  class NilClass
+    private
+    def to_ary
+      [1, 2]
+    end
+  end
+
+  def expandarray_redefined_nilclass
+    a, b = nil
+    [a, b]
+  end
+
+  expandarray_redefined_nilclass
+  expandarray_redefined_nilclass
+}
+
+assert_equal 'not_array', %q{
+  def expandarray_not_array(obj)
+    a, = obj
+    a
+  end
+
+  obj = Object.new
+  def obj.method_missing(m, *args, &block)
+    return [:not_array] if m == :to_ary
+    super
+  end
+
+  expandarray_not_array(obj)
+  expandarray_not_array(obj)
+}
+
 assert_equal '[1, 2, nil]', %q{
   def expandarray_rhs_too_small
     a, b, c = [1, 2]
@@ -1845,6 +2706,17 @@ assert_equal '[1, 2, nil]', %q{
   expandarray_rhs_too_small
 }
 
+assert_equal '[nil, 2, nil]', %q{
+  def foo(arr)
+    a, b, c = arr
+  end
+
+  a, b, c1 = foo([0, 1])
+  a, b, c2 = foo([0, 1, 2])
+  a, b, c3 = foo([0, 1])
+  [c1, c2, c3]
+}
+
 assert_equal '[1, [2]]', %q{
   def expandarray_splat
     a, *b = [1, 2]
@@ -2033,6 +2905,26 @@ assert_equal '[[:c_return, :itself, main]]', %q{
   events
 }
 
+# test c_call invalidation
+assert_equal '[[:c_call, :itself]]', %q{
+  # enable the event once to make sure invalidation
+  # happens the second time we enable it
+  TracePoint.new(:c_call) {}.enable{}
+
+  def compiled
+    itself
+  end
+
+  # assume first call compiles
+  compiled
+
+  events = []
+  tp = TracePoint.new(:c_call) { |tp| events << [tp.event, tp.method_id] }
+  tp.enable { compiled }
+
+  events
+}
+
 # test enabling tracing for a suspended fiber
 assert_equal '[[:return, 42]]', %q{
   def traced_method
@@ -2057,15 +2949,16 @@ assert_equal '[:itself]', %q{
     itself
   end
 
-  tracing_ractor = Ractor.new do
+  port = Ractor::Port.new
+  tracing_ractor = Ractor.new port do |port|
     # 1: start tracing
     events = []
     tp = TracePoint.new(:c_call) { events << _1.method_id }
     tp.enable
-    Ractor.yield(nil)
+    port << nil
 
     # 3: run compiled method on tracing ractor
-    Ractor.yield(nil)
+    port << nil
     traced_method
 
     events
@@ -2073,13 +2966,13 @@ assert_equal '[:itself]', %q{
     tp&.disable
   end
 
-  tracing_ractor.take
+  port.receive
 
   # 2: compile on non tracing ractor
   traced_method
 
-  tracing_ractor.take
-  tracing_ractor.take
+  port.receive
+  tracing_ractor.value
 }
 
 # Try to hit a lazy branch stub while another ractor enables tracing
@@ -2093,17 +2986,18 @@ assert_equal '42', %q{
     end
   end
 
-  ractor = Ractor.new do
+  port = Ractor::Port.new
+  ractor = Ractor.new port do |port|
     compiled(false)
-    Ractor.yield(nil)
+    port << nil
     compiled(41)
   end
 
   tp = TracePoint.new(:line) { itself }
-  ractor.take
+  port.receive
   tp.enable
 
-  ractor.take
+  ractor.value
 }
 
 # Test equality with changing types
@@ -2179,7 +3073,7 @@ assert_equal '42',  %q{
   A.foo
   A.foo
 
-  Ractor.new { A.foo }.take
+  Ractor.new { A.foo }.value
 }
 
 assert_equal '["plain", "special", "sub", "plain"]', %q{
@@ -2431,7 +3325,7 @@ assert_equal '[[1, 2, 3, 4]]', %q{
 }
 
 # cfunc kwargs
-assert_equal '{:foo=>123}', %q{
+assert_equal '{foo: 123}', %q{
   def foo(bar)
     bar.store(:value, foo: 123)
     bar[:value]
@@ -2442,7 +3336,7 @@ assert_equal '{:foo=>123}', %q{
 }
 
 # cfunc kwargs
-assert_equal '{:foo=>123}', %q{
+assert_equal '{foo: 123}', %q{
   def foo(bar)
     bar.replace(foo: 123)
   end
@@ -2452,7 +3346,7 @@ assert_equal '{:foo=>123}', %q{
 }
 
 # cfunc kwargs
-assert_equal '{:foo=>123, :bar=>456}', %q{
+assert_equal '{foo: 123, bar: 456}', %q{
   def foo(bar)
     bar.replace(foo: 123, bar: 456)
   end
@@ -2462,7 +3356,7 @@ assert_equal '{:foo=>123, :bar=>456}', %q{
 }
 
 # variadic cfunc kwargs
-assert_equal '{:foo=>123}', %q{
+assert_equal '{foo: 123}', %q{
   def foo(bar)
     bar.merge(foo: 123)
   end
@@ -2586,7 +3480,7 @@ assert_equal "true", %q{
 }
 
 # duphash
-assert_equal '{:foo=>123}', %q{
+assert_equal '{foo: 123}', %q{
   def foo
     {foo: 123}
   end
@@ -2596,7 +3490,7 @@ assert_equal '{:foo=>123}', %q{
 }
 
 # newhash
-assert_equal '{:foo=>2}', %q{
+assert_equal '{foo: 2}', %q{
   def foo
     {foo: 1+1}
   end
@@ -2685,11 +3579,20 @@ assert_equal 'new', %q{
     foo
   end
 
+  def bar
+    :bar
+  end
+
+
   test
   test
 
   RubyVM::YJIT.simulate_oom! if defined?(RubyVM::YJIT)
 
+  # Old simulat_omm! leaves one byte of space and this fills it up
+  bar
+  bar
+
   def foo
     :new
   end
@@ -2697,6 +3600,74 @@ assert_equal 'new', %q{
   test
 }
 
+# Bug #21257 (infinite jmp)
+assert_equal 'ok', %q{
+  Good = :ok
+
+  def first
+    second
+  end
+
+  def second
+    ::Good
+  end
+
+  # Make `second` side exit on its first instruction
+  trace = TracePoint.new(:line) { }
+  trace.enable(target: method(:second))
+
+  first
+  # Recompile now that the constant cache is populated, so we get a fallthrough from `first` to `second`
+  # (this is need to reproduce with --yjit-call-threshold=1)
+  RubyVM::YJIT.code_gc if defined?(RubyVM::YJIT)
+  first
+
+  # Trigger a constant cache miss in rb_vm_opt_getconstant_path (in `second`) next time it's called
+  module InvalidateConstantCache
+    Good = nil
+  end
+
+  RubyVM::YJIT.simulate_oom! if defined?(RubyVM::YJIT)
+
+  first
+  first
+}
+
+assert_equal 'ok', %q{
+  # Multiple incoming branches into second
+  Good = :ok
+
+  def incoming_one
+    second
+  end
+
+  def incoming_two
+    second
+  end
+
+  def second
+    ::Good
+  end
+
+  # Make `second` side exit on its first instruction
+  trace = TracePoint.new(:line) { }
+  trace.enable(target: method(:second))
+
+  incoming_one
+  # Recompile now that the constant cache is populated, so we get a fallthrough from `incoming_one` to `second`
+  # (this is need to reproduce with --yjit-call-threshold=1)
+  RubyVM::YJIT.code_gc if defined?(RubyVM::YJIT)
+  incoming_one
+  incoming_two
+
+  # Trigger a constant cache miss in rb_vm_opt_getconstant_path (in `second`) next time it's called
+  module InvalidateConstantCache
+    Good = nil
+  end
+
+  incoming_one
+}
+
 assert_equal 'ok', %q{
   # Try to compile new method while OOM
   def foo
@@ -2821,32 +3792,1671 @@ assert_equal '3,12', %q{
   pt_inspect(p)
 }
 
-# Regression test for deadlock between branch_stub_hit and ractor_receive_if
-assert_equal '10', %q{
-  r = Ractor.new Ractor.current do |main|
-    main << 1
-    main << 2
-    main << 3
-    main << 4
-    main << 5
-    main << 6
-    main << 7
-    main << 8
-    main << 9
-    main << 10
+# checktype
+assert_equal 'false', %q{
+    def function()
+        [1, 2] in [Integer, String]
+    end
+    function()
+}
+
+# opt_send_without_block (VM_METHOD_TYPE_ATTRSET)
+assert_equal 'foo', %q{
+    class Foo
+      attr_writer :foo
+
+      def foo()
+        self.foo = "foo"
+      end
+    end
+    foo = Foo.new
+    foo.foo
+}
+
+# anytostring, intern
+assert_equal 'true', %q{
+    def foo()
+      :"#{true}"
+    end
+    foo()
+}
+
+# toregexp, objtostring
+assert_equal '/true/', %q{
+    def foo()
+      /#{true}/
+    end
+    foo().inspect
+}
+
+# concatstrings, objtostring
+assert_equal '9001', %q{
+    def foo()
+      "#{9001}"
+    end
+    foo()
+}
+
+# opt_send_without_block (VM_METHOD_TYPE_CFUNC)
+assert_equal 'nil', %q{
+    def foo
+      nil.inspect # argc: 0
+    end
+    foo
+}
+assert_equal '4', %q{
+    def foo
+      2.pow(2) # argc: 1
+    end
+    foo
+}
+assert_equal 'aba', %q{
+    def foo
+      "abc".tr("c", "a") # argc: 2
+    end
+    foo
+}
+assert_equal 'true', %q{
+    def foo
+      respond_to?(:inspect) # argc: -1
+    end
+    foo
+}
+assert_equal '["a", "b"]', %q{
+    def foo
+      "a\nb".lines(chomp: true) # kwargs
+    end
+    foo
+}
+
+# invokebuiltin
+assert_equal '123', %q{
+  def foo(obj)
+    obj.foo = 123
+  end
+
+  struct = Struct.new(:foo)
+  obj = struct.new
+  foo(obj)
+}
+
+# invokebuiltin_delegate
+assert_equal '.', %q{
+  def foo(path)
+    Dir.open(path).path
+  end
+  foo(".")
+}
+
+# opt_invokebuiltin_delegate_leave
+assert_equal '[0]', %q{"\x00".unpack("c")}
+
+# opt_send_without_block (VM_METHOD_TYPE_ISEQ)
+assert_equal '1', %q{
+  def foo = 1
+  def bar = foo
+  bar
+}
+assert_equal '[1, 2, 3]', %q{
+  def foo(a, b) = [1, a, b]
+  def bar = foo(2, 3)
+  bar
+}
+assert_equal '[1, 2, 3, 4, 5, 6]', %q{
+  def foo(a, b, c:, d:, e: 0, f: 6) = [a, b, c, d, e, f]
+  def bar = foo(1, 2, c: 3, d: 4, e: 5)
+  bar
+}
+assert_equal '[1, 2, 3, 4]', %q{
+  def foo(a, b = 2) = [a, b]
+  def bar = foo(1) + foo(3, 4)
+  bar
+}
+
+assert_equal '1', %q{
+  def foo(a) = a
+  def bar = foo(1) { 2 }
+  bar
+}
+assert_equal '[1, 2]', %q{
+  def foo(a, &block) = [a, block.call]
+  def bar = foo(1) { 2 }
+  bar
+}
+
+# opt_send_without_block (VM_METHOD_TYPE_IVAR)
+assert_equal 'foo', %q{
+  class Foo
+    attr_reader :foo
+
+    def initialize
+      @foo = "foo"
+    end
+  end
+  Foo.new.foo
+}
+
+# opt_send_without_block (VM_METHOD_TYPE_OPTIMIZED)
+assert_equal 'foo', %q{
+  Foo = Struct.new(:bar)
+  Foo.new("bar").bar = "foo"
+}
+assert_equal 'foo', %q{
+  Foo = Struct.new(:bar)
+  Foo.new("foo").bar
+}
+
+# getblockparamproxy
+assert_equal 'foo', %q{
+  def foo(&block)
+    block.call
+  end
+  foo { "foo" }
+}
+
+# getblockparam
+assert_equal 'foo', %q{
+  def foo(&block)
+    block
+  end
+  foo { "foo" }.call
+}
+
+assert_equal '[1, 2]', %q{
+  def foo
+    x = [2]
+    [1, *x]
+  end
+
+  foo
+  foo
+}
+
+# respond_to? with changing symbol
+assert_equal 'false', %q{
+  def foo(name)
+    :sym.respond_to?(name)
+  end
+  foo(:to_s)
+  foo(:to_s)
+  foo(:not_exist)
+}
+
+# respond_to? with method being defined
+assert_equal 'true', %q{
+  def foo
+    :sym.respond_to?(:not_yet_defined)
+  end
+  foo
+  foo
+  module Kernel
+    def not_yet_defined = true
+  end
+  foo
+}
+
+# respond_to? with undef method
+assert_equal 'false', %q{
+  module Kernel
+    def to_be_removed = true
+  end
+  def foo
+    :sym.respond_to?(:to_be_removed)
+  end
+  foo
+  foo
+  class Object
+    undef_method :to_be_removed
+  end
+  foo
+}
+
+# respond_to? with respond_to_missing?
+assert_equal 'true', %q{
+  class Foo
+  end
+  def foo(x)
+    x.respond_to?(:bar)
+  end
+  foo(Foo.new)
+  foo(Foo.new)
+  class Foo
+    def respond_to_missing?(*) = true
+  end
+  foo(Foo.new)
+}
+
+# bmethod
+assert_equal '[1, 2, 3]', %q{
+  one = 1
+  define_method(:foo) do
+    one
+  end
+
+  3.times.map { |i| foo + i }
+}
+
+# return inside bmethod
+assert_equal 'ok', %q{
+  define_method(:foo) do
+    1.tap { return :ok }
+  end
+
+  foo
+}
+
+# bmethod optional and keywords
+assert_equal '[[1, nil, 2]]', %q{
+  define_method(:opt_and_kwargs) do |a = {}, b: nil, c: nil|
+    [a, b, c]
+  end
+
+  5.times.map { opt_and_kwargs(1, c: 2) }.uniq
+}
+
+# bmethod with forwarded block
+assert_equal '2', %q{
+  define_method(:foo) do |&block|
+    block.call
+  end
+
+  def bar(&block)
+    foo(&block)
+  end
+
+  bar { 1 }
+  bar { 2 }
+}
+
+# bmethod with forwarded block and arguments
+assert_equal '5', %q{
+  define_method(:foo) do |n, &block|
+    n + block.call
+  end
+
+  def bar(n, &block)
+    foo(n, &block)
+  end
+
+  bar(0) { 1 }
+  bar(3) { 2 }
+}
+
+# bmethod with forwarded unwanted block
+assert_equal '1', %q{
+  one = 1
+  define_method(:foo) do
+    one
+  end
+
+  def bar(&block)
+    foo(&block)
+  end
+
+  bar { }
+  bar { }
+}
+
+# unshareable bmethod call through Method#to_proc#call
+assert_equal '1000', %q{
+  define_method(:bmethod) do
+    self
+  end
+
+  Ractor.new do
+    errors = 0
+    1000.times do
+      p = method(:bmethod).to_proc
+      begin
+        p.call
+      rescue RuntimeError
+        errors += 1
+      end
+    end
+    errors
+  end.value
+}
+
+# test for return stub lifetime issue
+assert_equal '1', %q{
+  def foo(n)
+    if n == 2
+      return 1.times { Object.define_method(:foo) {} }
+    end
+
+    foo(n + 1)
+  end
+
+  foo(1)
+}
+
+# case-when with redefined ===
+assert_equal 'ok', %q{
+  class Symbol
+    def ===(a)
+      true
+    end
+  end
+
+  def cw(arg)
+    case arg
+    when :b
+      :ok
+    when 4
+      :ng
+    end
+  end
+
+  cw(4)
+}
+
+assert_equal 'threw', %q{
+  def foo(args)
+    wrap(*args)
+  rescue ArgumentError
+    'threw'
+  end
+
+  def wrap(a)
+    [a]
+  end
+
+  foo([Hash.ruby2_keywords_hash({})])
+}
+
+assert_equal 'threw', %q{
+  # C call
+  def bar(args)
+    Array(*args)
+  rescue ArgumentError
+    'threw'
   end
 
+  bar([Hash.ruby2_keywords_hash({})])
+}
+
+# Test instance_of? and is_a?
+assert_equal 'true', %q{
+  1.instance_of?(Integer) && 1.is_a?(Integer)
+}
+
+# Test instance_of? and is_a? for singleton classes
+assert_equal 'true', %q{
+  a = []
+  def a.test = :test
+  a.instance_of?(Array) && a.is_a?(Array)
+}
+
+# Test instance_of? for singleton_class
+# Yes this does really return false
+assert_equal 'false', %q{
+  a = []
+  def a.test = :test
+  a.instance_of?(a.singleton_class)
+}
+
+# Test is_a? for singleton_class
+assert_equal 'true', %q{
   a = []
-  a << Ractor.receive_if{|msg| msg == 10}
-  a << Ractor.receive_if{|msg| msg == 9}
-  a << Ractor.receive_if{|msg| msg == 8}
-  a << Ractor.receive_if{|msg| msg == 7}
-  a << Ractor.receive_if{|msg| msg == 6}
-  a << Ractor.receive_if{|msg| msg == 5}
-  a << Ractor.receive_if{|msg| msg == 4}
-  a << Ractor.receive_if{|msg| msg == 3}
-  a << Ractor.receive_if{|msg| msg == 2}
-  a << Ractor.receive_if{|msg| msg == 1}
-
-  a.length
+  def a.test = :test
+  a.is_a?(a.singleton_class)
+}
+
+# Test send with splat to a cfunc
+assert_equal 'true', %q{
+  1.send(:==, 1, *[])
+}
+
+# Test empty splat with cfunc
+assert_equal '2', %q{
+  def foo
+    Integer.sqrt(4, *[])
+  end
+  # call twice to deal with constant exiting
+  foo
+  foo
+}
+
+# Test non-empty splat with cfunc
+assert_equal 'Hello World', %q{
+  def bar
+    args = ["Hello "]
+    greeting = +"World"
+    greeting.insert(0, *args)
+    greeting
+  end
+  bar
+}
+
+# Regression: this creates a temp stack with > 127 elements
+assert_normal_exit %q{
+  def foo(a)
+    [
+      a, a, a, a, a, a, a, a, a, a,
+      a, a, a, a, a, a, a, a, a, a,
+      a, a, a, a, a, a, a, a, a, a,
+      a, a, a, a, a, a, a, a, a, a,
+      a, a, a, a, a, a, a, a, a, a,
+      a, a, a, a, a, a, a, a, a, a,
+      a, a, a, a, a, a, a, a, a, a,
+      a, a, a, a, a, a, a, a, a, a,
+      a, a, a, a, a, a, a, a, a, a,
+      a, a, a, a, a, a, a, a, a, a,
+      a, a, a, a, a, a, a, a, a, a,
+      a, a, a, a, a, a, a, a, a, a,
+      a, a, a, a, a, a, a, a,
+    ]
+  end
+
+  def entry
+    foo(1)
+  end
+
+  entry
+}
+
+# Test that splat and rest combined
+# properly dupe the array
+assert_equal "[]", %q{
+  def foo(*rest)
+    rest << 1
+  end
+
+  def test(splat)
+    foo(*splat)
+  end
+
+  EMPTY = []
+  custom = Object.new
+  def custom.to_a
+    EMPTY
+  end
+
+  test(custom)
+  test(custom)
+  EMPTY
+}
+
+# Rest with send
+assert_equal '[1, 2, 3]', %q{
+  def bar(x, *rest)
+    rest.insert(0, x)
+  end
+  send(:bar, 1, 2, 3)
+}
+
+# Fix splat block arg bad compilation
+assert_equal "foo", %q{
+  def literal(*args, &block)
+    s = ''.dup
+    literal_append(s, *args, &block)
+    s
+  end
+
+  def literal_append(sql, v)
+    sql << v
+  end
+
+  literal("foo")
+}
+
+# regression test for accidentally having a parameter truncated
+# due to Rust/C signature mismatch. Used to crash with
+# > [BUG] rb_vm_insn_addr2insn: invalid insn address ...
+# or
+# > ... `Err` value: TryFromIntError(())'
+assert_normal_exit %q{
+  n = 16384
+  eval(
+    "def foo(arg); " + "_=arg;" * n + '_=1;' + "Object; end"
+  )
+  foo 1
+}
+
+# Regression test for CantCompile not using starting_ctx
+assert_normal_exit %q{
+  class Integer
+    def ===(other)
+      false
+    end
+  end
+
+  def my_func(x)
+    case x
+    when 1
+      1
+    when 2
+      2
+    else
+      3
+    end
+  end
+
+  my_func(1)
+}
+
+# Regression test for CantCompile not using starting_ctx
+assert_equal "ArgumentError", %q{
+  def literal(*args, &block)
+    s = ''.dup
+    args = [1, 2, 3]
+    literal_append(s, *args, &block)
+    s
+  end
+
+  def literal_append(sql, v)
+    [sql.inspect, v.inspect]
+  end
+
+  begin
+    literal("foo")
+  rescue ArgumentError
+    "ArgumentError"
+  end
+}
+
+# Rest with block
+# Simplified code from railsbench
+assert_equal '[{"/a" => "b", as: :c, via: :post}, [], nil]', %q{
+  def match(path, *rest, &block)
+    [path, rest, block]
+  end
+
+  def map_method(method, args, &block)
+    options = args.last
+    args.pop
+    options[:via] = method
+    match(*args, options, &block)
+  end
+
+  def post(*args, &block)
+    map_method(:post, args, &block)
+  end
+
+  post "/a" => "b", as: :c
+}
+
+# Test rest and kw_args
+assert_equal '[true, true, true, true]', %q{
+  def my_func(*args, base: nil, sort: true)
+    [args, base, sort]
+  end
+
+  def calling_my_func
+    results = []
+    results << (my_func("test") == [["test"], nil, true])
+    results << (my_func("test", base: :base) == [["test"], :base, true])
+    results << (my_func("test", sort: false) == [["test"], nil, false])
+    results << (my_func("test", "other", base: :base) == [["test", "other"], :base, true])
+    results
+  end
+  calling_my_func
+}
+
+# Test Integer#[] with 2 args
+assert_equal '0', %q{
+  3[0, 0]
+}
+
+# unspecified_bits + checkkeyword
+assert_equal '2', %q{
+  def callee = 1
+
+  # checkkeyword should see unspecified_bits=0 (use bar), not Integer 1 (set bar = foo).
+  def foo(foo, bar: foo) = bar
+
+  def entry(&block)
+    # write 1 at stack[3]. Calling #callee spills stack[3].
+    1 + (1 + (1 + (1 + callee)))
+    # &block is written to a register instead of stack[3]. When &block is popped and
+    # unspecified_bits is pushed, it must be written to stack[3], not to a register.
+    foo(1, bar: 2, &block)
+  end
+
+  entry # call branch_stub_hit (spill temps)
+  entry # doesn't call branch_stub_hit (not spill temps)
+}
+
+# Test rest and optional_params
+assert_equal '[true, true, true, true]', %q{
+  def my_func(stuff, base=nil, sort=true, *args)
+    [stuff, base, sort, args]
+  end
+
+  def calling_my_func
+    results = []
+    results << (my_func("test") == ["test", nil, true, []])
+    results << (my_func("test", :base) == ["test", :base, true, []])
+    results << (my_func("test", :base, false) == ["test", :base, false, []])
+    results << (my_func("test", :base, false, "other", "other") == ["test", :base, false, ["other", "other"]])
+    results
+  end
+  calling_my_func
+}
+
+# Test rest and optional_params and splat
+assert_equal '[true, true, true, true, true]', %q{
+  def my_func(stuff, base=nil, sort=true, *args)
+    [stuff, base, sort, args]
+  end
+
+  def calling_my_func
+    results = []
+    splat = ["test"]
+    results << (my_func(*splat) == ["test", nil, true, []])
+    splat = [:base]
+    results << (my_func("test", *splat) == ["test", :base, true, []])
+    splat = [:base, false]
+    results << (my_func("test", *splat) == ["test", :base, false, []])
+    splat = [:base, false, "other", "other"]
+    results << (my_func("test", *splat) == ["test", :base, false, ["other", "other"]])
+    splat = ["test", :base, false, "other", "other"]
+    results << (my_func(*splat) == ["test", :base, false, ["other", "other"]])
+    results
+  end
+  calling_my_func
+}
+
+# Regression test: rest and optional and splat
+assert_equal 'true', %q{
+  def my_func(base=nil, *args)
+    [base, args]
+  end
+
+  def calling_my_func
+    array = []
+    my_func(:base, :rest1, *array) == [:base, [:rest1]]
+  end
+
+  calling_my_func
+}
+
+# Fix failed case for large splat
+assert_equal 'true', %q{
+  def d(a, b=:b)
+  end
+
+  def calling_func
+    ary = 1380888.times;
+    d(*ary)
+  end
+  begin
+    calling_func
+  rescue ArgumentError
+    true
+  end
+}
+
+# Regression test: register allocator on expandarray
+assert_equal '[]', %q{
+  func = proc { [] }
+  proc do
+    _x, _y = func.call
+  end.call
+}
+
+# Catch TAG_BREAK in a non-FINISH frame with JIT code
+assert_equal '1', %q{
+  def entry
+    catch_break
+  end
+
+  def catch_break
+    while_true do
+      break
+    end
+    1
+  end
+
+  def while_true
+    while true
+      yield
+    end
+  end
+
+  entry
+}
+
+assert_equal '6', %q{
+  class Base
+    def number = 1 + yield
+  end
+
+  class Sub < Base
+    def number = super + 2
+  end
+
+  Sub.new.number { 3 }
+}
+
+# Integer multiplication and overflow
+assert_equal '[6, -6, 9671406556917033397649408, -9671406556917033397649408, 21267647932558653966460912964485513216]', %q{
+  def foo(a, b)
+    a * b
+  end
+
+  r1 = foo(2, 3)
+  r2 = foo(2, -3)
+  r3 = foo(2 << 40, 2 << 41)
+  r4 = foo(2 << 40, -2 << 41)
+  r5 = foo(1 << 62, 1 << 62)
+
+  [r1, r2, r3, r4, r5]
+}
+
+# Integer multiplication and overflow (minimized regression test from test-basic)
+assert_equal '8515157028618240000', %q{2128789257154560000 * 4}
+
+# Inlined method calls
+assert_equal 'nil', %q{
+  def putnil = nil
+  def entry = putnil
+  entry.inspect
+}
+assert_equal '1', %q{
+  def putobject_1 = 1
+  def entry = putobject_1
+  entry
+}
+assert_equal 'false', %q{
+  def putobject(_unused_arg1) = false
+  def entry = putobject(nil)
+  entry
+}
+assert_equal 'true', %q{
+  def entry = yield
+  entry { true }
+}
+assert_equal 'sym', %q{
+  def entry = :sym.to_sym
+  entry
+}
+
+assert_normal_exit %q{
+  ivars = 1024.times.map { |i| "@iv_#{i} = #{i}\n" }.join
+  Foo = Class.new
+  Foo.class_eval "def initialize() #{ivars} end"
+  Foo.new
+}
+
+assert_equal '0', %q{
+  def spill
+    1.to_i # not inlined
+  end
+
+  def inline(_stack1, _stack2, _stack3, _stack4, _stack5)
+    0 # inlined
+  end
+
+  def entry
+    # RegTemps is 00111110 prior to the #inline call.
+    # Its return value goes to stack_idx=0, which conflicts with stack_idx=5.
+    inline(spill, 2, 3, 4, 5)
+  end
+
+  entry
+}
+
+# Integer succ and overflow
+assert_equal '[2, 4611686018427387904]', %q{
+  [1.succ, 4611686018427387903.succ]
+}
+
+# Integer pred and overflow
+assert_equal '[0, -4611686018427387905]', %q{
+  [1.pred, -4611686018427387904.pred]
+}
+
+# Integer right shift
+assert_equal '[0, 1, -4]', %q{
+  [0 >> 1, 2 >> 1, -7 >> 1]
+}
+
+# Integer XOR
+assert_equal '[0, 0, 4]', %q{
+  [0 ^ 0, 1 ^ 1, 7 ^ 3]
+}
+
+assert_equal '[nil, "yield"]', %q{
+  def defined_yield = defined?(yield)
+  [defined_yield, defined_yield {}]
+}
+
+# splat with ruby2_keywords into rest parameter
+assert_equal '[[{a: 1}], {}]', %q{
+  ruby2_keywords def foo(*args) = args
+
+  def bar(*args, **kw) = [args, kw]
+
+  def pass_bar(*args) = bar(*args)
+
+  def body
+    args = foo(a: 1)
+    pass_bar(*args)
+  end
+
+  body
+}
+
+# concatarray
+assert_equal '[1, 2]', %q{
+  def foo(a, b) = [a, b]
+  arr = [2]
+  foo(*[1], *arr)
+}
+
+# pushtoarray
+assert_equal '[1, 2]', %q{
+  def foo(a, b) = [a, b]
+  arr = [1]
+  foo(*arr, 2)
+}
+
+# pop before fallback
+assert_normal_exit %q{
+  class Foo
+    attr_reader :foo
+
+    def try = foo(0, &nil)
+  end
+
+  Foo.new.try
+}
+
+# a kwrest case
+assert_equal '[1, 2, {complete: false}]', %q{
+  def rest(foo: 1, bar: 2, **kwrest)
+    [foo, bar, kwrest]
+  end
+
+  def callsite = rest(complete: false)
+
+  callsite
+}
+
+# splat+kw_splat+opt+rest
+assert_equal '[1, []]', %q{
+  def opt_rest(a = 0, *rest) = [a, rest]
+
+  def call_site(args) = opt_rest(*args, **nil)
+
+  call_site([1])
+}
+
+# splat and nil kw_splat
+assert_equal 'ok', %q{
+  def identity(x) = x
+
+  def splat_nil_kw_splat(args) = identity(*args, **nil)
+
+  splat_nil_kw_splat([:ok])
+}
+
+# empty splat and kwsplat into leaf builtins
+assert_equal '[1, 1, 1]', %q{
+  empty = []
+  [1.abs(*empty), 1.abs(**nil), 1.bit_length(*empty, **nil)]
+}
+
+# splat into C methods with -1 arity
+assert_equal '[[1, 2, 3], [0, 2, 3], [1, 2, 3], [2, 2, 3], [], [], [{}]]', %q{
+  class Foo < Array
+    def push(args) = super(1, *args)
+  end
+
+  def test_cfunc_vargs_splat(sub_instance, array_class, empty_kw_hash)
+    splat = [2, 3]
+    kw_splat = [empty_kw_hash]
+    [
+      sub_instance.push(splat),
+      array_class[0, *splat, **nil],
+      array_class[1, *splat, &nil],
+      array_class[2, *splat, **nil, &nil],
+      array_class.send(:[], *kw_splat),
+      # kw_splat disables keywords hash handling
+      array_class[*kw_splat],
+      array_class[*kw_splat, **nil],
+    ]
+  end
+
+  test_cfunc_vargs_splat(Foo.new, Array, Hash.ruby2_keywords_hash({}))
+}
+
+# Class#new (arity=-1), splat, and ruby2_keywords
+assert_equal '[0, {1 => 1}]', %q{
+  class KwInit
+    attr_reader :init_args
+    def initialize(x = 0, **kw)
+      @init_args = [x, kw]
+    end
+  end
+
+  def test(klass, args)
+    klass.new(*args).init_args
+  end
+
+  test(KwInit, [Hash.ruby2_keywords_hash({1 => 1})])
+}
+
+# Chilled string setivar trigger warning
+assert_match(/literal string will be frozen in the future/, %q{
+  Warning[:deprecated] = true
+  $VERBOSE = true
+  $warning = "no-warning"
+  module ::Warning
+    def self.warn(message)
+      $warning = message.split("warning: ").last.strip
+    end
+  end
+
+  class String
+    def setivar!
+      @ivar = 42
+    end
+  end
+
+  def setivar!(str)
+    str.setivar!
+  end
+
+  10.times { setivar!("mutable".dup) }
+  10.times do
+    setivar!("frozen".freeze)
+  rescue FrozenError
+  end
+
+  setivar!("chilled") # Emit warning
+  $warning
+})
+
+# arity=-2 cfuncs
+assert_equal '["", "1/2", [0, [:ok, 1]]]', %q{
+  def test_cases(file, chain)
+    new_chain = chain.allocate # to call initialize directly
+    new_chain.send(:initialize, [0], ok: 1)
+
+    [
+      file.join,
+      file.join("1", "2"),
+      new_chain.to_a,
+    ]
+  end
+
+  test_cases(File, Enumerator::Chain)
+}
+
+# singleton class should invalidate Type::CString assumption
+assert_equal 'foo', %q{
+  def define_singleton(str, define)
+    if define
+      # Wrap a C method frame to avoid exiting JIT code on defineclass
+      [nil].reverse_each do
+        class << str
+          def +(_)
+            "foo"
+          end
+        end
+      end
+    end
+    "bar"
+  end
+
+  def entry(define)
+    str = ""
+    # When `define` is false, #+ compiles to rb_str_plus() without a class guard.
+    # When the code is reused with `define` is true, the class of `str` is changed
+    # to a singleton class, so the block should be invalidated.
+    str + define_singleton(str, define)
+  end
+
+  entry(false)
+  entry(true)
+}
+
+assert_equal 'ok', %q{
+  def ok
+    :ok
+  end
+
+  def delegator(...)
+    ok(...)
+  end
+
+  def caller
+    send(:delegator)
+  end
+
+  caller
+}
+
+# test inlining of simple iseqs
+assert_equal '[:ok, :ok, :ok]', %q{
+  def identity(x) = x
+  def foo(x, _) = x
+  def bar(_, _, _, _, x) = x
+
+  def tests
+    [
+      identity(:ok),
+      foo(:ok, 2),
+      bar(1, 2, 3, 4, :ok),
+    ]
+  end
+
+  tests
+}
+
+# test inlining of simple iseqs with kwargs
+assert_equal '[:ok, :ok, :ok, :ok, :ok]', %q{
+  def optional_unused(x, opt: :not_ok) = x
+  def optional_used(x, opt: :ok) = opt
+  def required_unused(x, req:) = x
+  def required_used(x, req:) = req
+  def unknown(x) = x
+
+  def tests
+    [
+      optional_unused(:ok),
+      optional_used(:not_ok),
+      required_unused(:ok, req: :not_ok),
+      required_used(:not_ok, req: :ok),
+      begin unknown(:not_ok, unknown_kwarg: :not_ok) rescue ArgumentError; :ok end,
+    ]
+  end
+
+  tests
+}
+
+# test simple iseqs not eligible for inlining
+assert_equal '[:ok, :ok, :ok, :ok, :ok]', %q{
+  def identity(x) = x
+  def arg_splat(x, *args) = x
+  def kwarg_splat(x, **kwargs) = x
+  def block_arg(x, &blk) = x
+  def block_iseq(x) = x
+  def call_forwarding(...) = identity(...)
+
+  def tests
+    [
+      arg_splat(:ok),
+      kwarg_splat(:ok),
+      block_arg(:ok, &proc { :not_ok }),
+      block_iseq(:ok) { :not_ok },
+      call_forwarding(:ok),
+    ]
+  end
+
+  tests
+}
+
+# regression test for splat with &proc{} when the target has rest (Bug #21266)
+assert_equal '[]', %q{
+  def foo(args) = bar(*args, &proc { _1 })
+  def bar(_, _, _, _, *rest) = yield rest
+
+  GC.stress = true
+  foo([1,2,3,4])
+  foo([1,2,3,4])
+}
+
+# regression test for invalidating an empty block
+assert_equal '0', %q{
+  def foo = (* = 1).pred
+
+  foo # compile it
+
+  class Integer
+    def to_ary = [] # invalidate
+  end
+
+  foo # try again
+}
+
+# test integer left shift with constant rhs
+assert_equal [0x80000000000, 'a+', :ok].inspect, %q{
+  def shift(val) = val << 43
+
+  def tests
+    int = shift(1)
+    str = shift("a")
+
+    Integer.define_method(:<<) { |_| :ok }
+    redef = shift(1)
+
+    [int, str, redef]
+  end
+
+  tests
+}
+
+# test integer left shift fusion followed by opt_getconstant_path
+assert_equal '33', %q{
+  def test(a)
+    (a << 5) | (Object; a)
+  end
+
+  test(1)
+}
+
+# test String#stebyte with arguments that need conversion
+assert_equal "abc", %q{
+  str = +"a00"
+  def change_bytes(str, one, two)
+    str.setbyte(one, "b".ord)
+    str.setbyte(2, two)
+  end
+
+  to_int_1 = Object.new
+  to_int_99 = Object.new
+  def to_int_1.to_int = 1
+  def to_int_99.to_int = 99
+
+  change_bytes(str, to_int_1, to_int_99)
+  str
+}
+
+# test --yjit-verify-ctx for arrays with a singleton class
+assert_equal "ok", %q{
+  class Array
+    def foo
+      self.singleton_class.define_method(:first) { :ok }
+      first
+    end
+  end
+
+  def test = [].foo
+
+  test
+}
+
+assert_equal '["raised", "Module", "Object"]', %q{
+  def foo(obj)
+    obj.superclass.name
+  end
+
+  ret = []
+
+  begin
+    foo(Class.allocate)
+  rescue TypeError
+    ret << 'raised'
+  end
+
+  ret += [foo(Class), foo(Class.new)]
+}
+
+# test TrueClass#=== before and after redefining TrueClass#==
+assert_equal '[[true, false, false], [true, true, false], [true, :error, :error]]', %q{
+  def true_eqq(x)
+    true === x
+  rescue NoMethodError
+    :error
+  end
+
+  def test
+    [
+      # first one is always true because rb_equal does object comparison before calling #==
+      true_eqq(true),
+      # these will use TrueClass#==
+      true_eqq(false),
+      true_eqq(:truthy),
+    ]
+  end
+
+  results = [test]
+
+  class TrueClass
+    def ==(x)
+      !x
+    end
+  end
+
+  results << test
+
+  class TrueClass
+    undef_method :==
+  end
+
+  results << test
+}
+
+# test FalseClass#=== before and after redefining FalseClass#==
+assert_equal '[[true, false, false], [true, false, true], [true, :error, :error]]', %q{
+  def case_equal(x, y)
+    x === y
+  rescue NoMethodError
+    :error
+  end
+
+  def test
+    [
+      # first one is always true because rb_equal does object comparison before calling #==
+      case_equal(false, false),
+      # these will use #==
+      case_equal(false, true),
+      case_equal(false, nil),
+    ]
+  end
+
+  results = [test]
+
+  class FalseClass
+    def ==(x)
+      !x
+    end
+  end
+
+  results << test
+
+  class FalseClass
+    undef_method :==
+  end
+
+  results << test
+}
+
+# test NilClass#=== before and after redefining NilClass#==
+assert_equal '[[true, false, false], [true, false, true], [true, :error, :error]]', %q{
+  def case_equal(x, y)
+    x === y
+  rescue NoMethodError
+    :error
+  end
+
+  def test
+    [
+      # first one is always true because rb_equal does object comparison before calling #==
+      case_equal(nil, nil),
+      # these will use #==
+      case_equal(nil, true),
+      case_equal(nil, false),
+    ]
+  end
+
+  results = [test]
+
+  class NilClass
+    def ==(x)
+      !x
+    end
+  end
+
+  results << test
+
+  class NilClass
+    undef_method :==
+  end
+
+  results << test
+}
+
+# test struct accessors fire c_call events
+assert_equal '[[:c_call, :x=], [:c_call, :x]]', %q{
+  c = Struct.new(:x)
+  obj = c.new
+
+  events = []
+  TracePoint.new(:c_call) do
+    events << [_1.event, _1.method_id]
+  end.enable do
+    obj.x = 100
+    obj.x
+  end
+
+  events
+}
+
+# regression test for splatting empty array
+assert_equal '1', %q{
+  def callee(foo) = foo
+
+  def test_body(args) = callee(1, *args)
+
+  test_body([])
+  array = Array.new(100)
+  array.clear
+  test_body(array)
+}
+
+# regression test for splatting empty array to cfunc
+assert_normal_exit %q{
+  def test_body(args) = Array(1, *args)
+
+  test_body([])
+  0x100.times do
+    array = Array.new(100)
+    array.clear
+    test_body(array)
+  end
+}
+
+# compiling code shouldn't emit warnings as it may call into more Ruby code
+assert_equal 'ok', <<~'RUBY'
+  # [Bug #20522]
+  $VERBOSE = true
+  Warning[:performance] = true
+
+  module StrictWarnings
+    def warn(msg, **)
+      raise msg
+    end
+  end
+  Warning.singleton_class.prepend(StrictWarnings)
+
+  class A
+    def compiled_method(is_private)
+      @some_ivar = is_private
+    end
+  end
+
+  shape_max_variations = 8
+  if defined?(RubyVM::Shape::SHAPE_MAX_VARIATIONS) && RubyVM::Shape::SHAPE_MAX_VARIATIONS != shape_max_variations
+    raise "Expected SHAPE_MAX_VARIATIONS to be #{shape_max_variations}, got: #{RubyVM::Shape::SHAPE_MAX_VARIATIONS}"
+  end
+
+  100.times do |i|
+    klass = Class.new(A)
+    (shape_max_variations - 1).times do |j|
+      obj = klass.new
+      obj.instance_variable_set("@base_#{i}", 42)
+      obj.instance_variable_set("@ivar_#{j}", 42)
+    end
+    obj = klass.new
+    obj.instance_variable_set("@base_#{i}", 42)
+    begin
+      obj.compiled_method(true)
+    rescue
+      # expected
+    end
+  end
+
+  :ok
+RUBY
+
+assert_equal 'ok', <<~'RUBY'
+  class MyRelation
+    def callee(...)
+      :ok
+    end
+
+    def uncached(...)
+      callee(...)
+    end
+
+    def takes_block(&block)
+      # push blockhandler
+      uncached(&block) # CI1
+    end
+  end
+
+  relation = MyRelation.new
+  relation.takes_block { }
+RUBY
+
+assert_equal 'ok', <<~'RUBY'
+  def _exec_scope(...)
+    instance_exec(...)
+  end
+
+  def ok args, body
+    _exec_scope(*args, &body)
+  end
+
+  ok([], -> { "ok" })
+RUBY
+
+assert_equal 'ok', <<~'RUBY'
+  def _exec_scope(...)
+    instance_exec(...)
+  end
+
+  def ok args, body
+    _exec_scope(*args, &body)
+  end
+
+  ok(["ok"], ->(x) { x })
+RUBY
+
+assert_equal 'ok', <<~'RUBY'
+def baz(a, b)
+  a + b
+end
+
+def bar(...)
+  baz(...)
+end
+
+def foo(a, ...)
+  bar(a, ...)
+end
+
+def test
+  foo("o", "k")
+end
+
+test
+RUBY
+
+# opt_newarray_send pack/buffer
+assert_equal '[true, true]', <<~'RUBY'
+  def pack
+    v = 1.23
+    [v, v*2, v*3].pack("E*").unpack("E*") == [v, v*2, v*3]
+  end
+
+  def with_buffer
+    v = 4.56
+    b = +"x"
+    [v, v*2, v*3].pack("E*", buffer: b)
+    b[1..].unpack("E*") == [v, v*2, v*3]
+  end
+
+  [pack, with_buffer]
+RUBY
+
+# String#[] / String#slice
+assert_equal 'ok', <<~'RUBY'
+  def error(klass)
+    yield
+  rescue klass
+    true
+  end
+
+  def test
+    str = "こんにちは"
+    substr = "にち"
+    failures = []
+
+    # Use many small statements to keep context for each slice call smaller than MAX_CTX_TEMPS
+
+    str[1] == "ん" && str.slice(4) == "は" || failures << :index
+    str[5].nil? && str.slice(5).nil? || failures << :index_end
+
+    str[1, 2] == "んに" && str.slice(2, 1) == "に" || failures << :beg_len
+    str[5, 1] == "" && str.slice(5, 1) == "" || failures << :beg_len_end
+
+    str[1..2] == "んに" && str.slice(2..2) == "に" || failures << :range
+
+    str[/に./] == "にち" && str.slice(/に./) == "にち" || failures << :regexp
+
+    str[/に./, 0] == "にち" && str.slice(/に./, 0) == "にち" || failures << :regexp_cap0
+
+    str[/に(.)/, 1] == "ち" && str.slice(/に(.)/, 1) == "ち" || failures << :regexp_cap1
+
+    str[substr] == substr && str.slice(substr) == substr || failures << :substr
+
+    error(TypeError) { str[Object.new] } && error(TypeError) { str.slice(Object.new, 1) } || failures << :type_error
+    error(RangeError) { str[Float::INFINITY] } && error(RangeError) { str.slice(Float::INFINITY) } || failures << :range_error
+
+    return "ok" if failures.empty?
+    {failures: failures}
+  end
+
+  test
+RUBY
+
+# opt_duparray_send :include?
+assert_equal '[true, false]', <<~'RUBY'
+  def test(x)
+    [:a, :b].include?(x)
+  end
+
+  [
+    test(:b),
+    test(:c),
+  ]
+RUBY
+
+# opt_newarray_send :include?
+assert_equal '[true, false]', <<~'RUBY'
+  def test(x)
+    [Object.new, :a, :b].include?(x.to_sym)
+  end
+
+  [
+    test("b"),
+    test("c"),
+  ]
+RUBY
+
+# YARV: swap and opt_reverse
+assert_equal '["x", "Y", "c", "A", "t", "A", "b", "C", "d"]', <<~'RUBY'
+  class Swap
+    def initialize(s)
+      @a, @b, @c, @d = s.split("")
+    end
+
+    def swap
+      a, b = @a, @b
+      b = b.upcase
+      @a, @b = a, b
+    end
+
+    def reverse_odd
+      a, b, c = @a, @b, @c
+      b = b.upcase
+      @a, @b, @c = a, b, c
+    end
+
+    def reverse_even
+      a, b, c, d = @a, @b, @c, @d
+      a = a.upcase
+      c = c.upcase
+      @a, @b, @c, @d = a, b, c, d
+    end
+  end
+
+  Swap.new("xy").swap + Swap.new("cat").reverse_odd + Swap.new("abcd").reverse_even
+RUBY
+
+assert_normal_exit %{
+  class Bug20997
+    def foo(&) = self.class.name(&)
+
+    new.foo
+  end
+}
+
+# This used to trigger a "try to mark T_NONE"
+# due to an uninitialized local in foo.
+assert_normal_exit %{
+  def foo(...)
+    _local_that_should_nil_on_call = GC.start
+  end
+
+  def test_bug21021
+    puts [], [], [], [], [], []
+    foo []
+  end
+
+  GC.stress = true
+  test_bug21021
+}
+
+assert_equal 'nil', %{
+  def foo(...)
+    _a = _b = _c = binding.local_variable_get(:_c)
+
+    _c
+  end
+
+  # [Bug #21021]
+  def test_local_fill_in_forwardable
+    puts [], [], [], [], []
+    foo []
+  end
+
+  test_local_fill_in_forwardable.inspect
+}
+
+# Test defined?(yield) and block_given? in non-method context.
+# It's good that the body of this runs at true top level and isn't wrapped in a block.
+assert_equal 'false', %{
+  RESULT = []
+  RESULT << defined?(yield)
+  RESULT << block_given?
+
+  1.times do
+    RESULT << defined?(yield)
+    RESULT << block_given?
+  end
+
+  module ModuleContext
+    1.times do
+      RESULT << defined?(yield)
+      RESULT << block_given?
+    end
+  end
+
+  class << self
+    RESULT << defined?(yield)
+    RESULT << block_given?
+  end
+
+  RESULT.any?
+}
+
+# throw and String#dup with GC stress
+assert_equal 'foo', %{
+  GC.stress = true
+
+  def foo
+    1.times { return "foo".dup }
+  end
+
+  10.times.map { foo.dup }.last
+}
+
+# regression test for [Bug #21772]
+# local variable type tracking desync
+assert_normal_exit %q{
+  def some_method = 0
+
+  def test_body(key)
+    some_method
+    key = key.to_s # setting of local relevant
+
+    key == "symbol"
+  end
+
+  def jit_caller = test_body("session_id")
+
+  jit_caller # first iteration, non-escaped environment
+  alias some_method binding # induce environment escape
+  test_body(:symbol)
+}
+
+# regression test for missing check in identity method inlining
+assert_normal_exit %q{
+  # Use dead code (if false) to create a local
+  # without initialization instructions.
+  def foo(a)
+    if false
+      x = nil
+    end
+    x
+  end
+  def test = foo(1)
+  test
+  test
 }
diff --git a/bootstraptest/test_yjit_rust_port.rb b/bootstraptest/test_yjit_rust_port.rb
index e399e0e49e..2dbcebc03a 100644
--- a/bootstraptest/test_yjit_rust_port.rb
+++ b/bootstraptest/test_yjit_rust_port.rb
@@ -374,7 +374,7 @@ assert_equal 'ok', %q{
   r = Ractor.new do
     'ok'
   end
-  r.take
+  r.value
 }
 
 # Passed arguments to Ractor.new will be a block parameter
@@ -384,7 +384,7 @@ assert_equal 'ok', %q{
   r = Ractor.new 'ok' do |msg|
     msg
   end
-  r.take
+  r.value
 }
 
 # Pass multiple arguments to Ractor.new
@@ -393,7 +393,7 @@ assert_equal 'ok', %q{
   r =  Ractor.new 'ping', 'pong' do |msg, msg2|
     [msg, msg2]
   end
-  'ok' if r.take == ['ping', 'pong']
+  'ok' if r.value == ['ping', 'pong']
 }
 
 # Ractor#send passes an object with copy to a Ractor
@@ -403,7 +403,7 @@ assert_equal 'ok', %q{
     msg = Ractor.receive
   end
   r.send 'ok'
-  r.take
+  r.value
 }
 
 assert_equal '[1, 2, 3]', %q{
diff --git a/box.c b/box.c
new file mode 100644
index 0000000000..830172cdd5
--- /dev/null
+++ b/box.c
@@ -0,0 +1,1220 @@
+/* indent-tabs-mode: nil */
+
+#include "eval_intern.h"
+#include "internal.h"
+#include "internal/box.h"
+#include "internal/class.h"
+#include "internal/eval.h"
+#include "internal/error.h"
+#include "internal/file.h"
+#include "internal/gc.h"
+#include "internal/hash.h"
+#include "internal/io.h"
+#include "internal/load.h"
+#include "internal/st.h"
+#include "internal/variable.h"
+#include "iseq.h"
+#include "ruby/internal/globals.h"
+#include "ruby/util.h"
+#include "vm_core.h"
+#include "darray.h"
+
+#include <stdio.h>
+
+#ifdef HAVE_SYS_SENDFILE_H
+# include <sys/sendfile.h>
+#endif
+#ifdef HAVE_COPYFILE_H
+#include <copyfile.h>
+#endif
+
+VALUE rb_cBox = 0;
+VALUE rb_cBoxEntry = 0;
+VALUE rb_mBoxLoader = 0;
+
+static rb_box_t root_box[1]; /* Initialize in initialize_root_box() */
+static rb_box_t *main_box;
+static char *tmp_dir;
+static bool tmp_dir_has_dirsep;
+
+#define BOX_TMP_PREFIX "_ruby_box_"
+
+#ifndef MAXPATHLEN
+# define MAXPATHLEN 1024
+#endif
+
+#if defined(_WIN32)
+# define DIRSEP "\\"
+#else
+# define DIRSEP "/"
+#endif
+
+bool ruby_box_enabled = false; // extern
+bool ruby_box_init_done = false; // extern
+bool ruby_box_crashed = false; // extern, changed only in vm.c
+
+VALUE rb_resolve_feature_path(VALUE klass, VALUE fname);
+static VALUE rb_box_inspect(VALUE obj);
+static void cleanup_all_local_extensions(VALUE libmap);
+
+void
+rb_box_init_done(void)
+{
+    ruby_box_init_done = true;
+}
+
+const rb_box_t *
+rb_root_box(void)
+{
+    return root_box;
+}
+
+const rb_box_t *
+rb_main_box(void)
+{
+    return main_box;
+}
+
+const rb_box_t *
+rb_current_box(void)
+{
+    /*
+     * If RUBY_BOX is not set, the root box is the only available one.
+     *
+     * Until the main_box is not initialized, the root box is
+     * the only valid box.
+     * This early return is to avoid accessing EC before its setup.
+     */
+    if (!main_box)
+        return root_box;
+
+    return rb_vm_current_box(GET_EC());
+}
+
+const rb_box_t *
+rb_loading_box(void)
+{
+    if (!main_box)
+        return root_box;
+
+    return rb_vm_loading_box(GET_EC());
+}
+
+const rb_box_t *
+rb_current_box_in_crash_report(void)
+{
+    if (ruby_box_crashed)
+        return NULL;
+    return rb_current_box();
+}
+
+static long box_id_counter = 0;
+
+static long
+box_generate_id(void)
+{
+    long id;
+    RB_VM_LOCKING() {
+        id = ++box_id_counter;
+    }
+    return id;
+}
+
+static VALUE
+box_main_to_s(VALUE obj)
+{
+    return rb_str_new2("main");
+}
+
+static void
+box_entry_initialize(rb_box_t *box)
+{
+    const rb_box_t *root = rb_root_box();
+
+    // These will be updated immediately
+    box->box_object = 0;
+    box->box_id = 0;
+
+    box->top_self = rb_obj_alloc(rb_cObject);
+    rb_define_singleton_method(box->top_self, "to_s", box_main_to_s, 0);
+    rb_define_alias(rb_singleton_class(box->top_self), "inspect", "to_s");
+    box->load_path = rb_ary_dup(root->load_path);
+    box->expanded_load_path = rb_ary_dup(root->expanded_load_path);
+    box->load_path_snapshot = rb_ary_new();
+    box->load_path_check_cache = 0;
+    box->loaded_features = rb_ary_dup(root->loaded_features);
+    box->loaded_features_snapshot = rb_ary_new();
+    box->loaded_features_index = st_init_numtable();
+    box->loaded_features_realpaths = rb_hash_dup(root->loaded_features_realpaths);
+    box->loaded_features_realpath_map = rb_hash_dup(root->loaded_features_realpath_map);
+    box->loading_table = st_init_strtable();
+    box->ruby_dln_libmap = rb_hash_new_with_size(0);
+    box->gvar_tbl = rb_hash_new_with_size(0);
+    box->classext_cow_classes = st_init_numtable();
+
+    box->is_user = true;
+    box->is_optional = true;
+}
+
+void
+rb_box_gc_update_references(void *ptr)
+{
+    rb_box_t *box = (rb_box_t *)ptr;
+    if (!box) return;
+
+    if (box->box_object)
+        box->box_object = rb_gc_location(box->box_object);
+    if (box->top_self)
+        box->top_self = rb_gc_location(box->top_self);
+    box->load_path = rb_gc_location(box->load_path);
+    box->expanded_load_path = rb_gc_location(box->expanded_load_path);
+    box->load_path_snapshot = rb_gc_location(box->load_path_snapshot);
+    if (box->load_path_check_cache) {
+        box->load_path_check_cache = rb_gc_location(box->load_path_check_cache);
+    }
+    box->loaded_features = rb_gc_location(box->loaded_features);
+    box->loaded_features_snapshot = rb_gc_location(box->loaded_features_snapshot);
+    box->loaded_features_realpaths = rb_gc_location(box->loaded_features_realpaths);
+    box->loaded_features_realpath_map = rb_gc_location(box->loaded_features_realpath_map);
+    box->ruby_dln_libmap = rb_gc_location(box->ruby_dln_libmap);
+    box->gvar_tbl = rb_gc_location(box->gvar_tbl);
+}
+
+void
+rb_box_entry_mark(void *ptr)
+{
+    const rb_box_t *box = (rb_box_t *)ptr;
+    if (!box) return;
+
+    rb_gc_mark(box->box_object);
+    rb_gc_mark(box->top_self);
+    rb_gc_mark(box->load_path);
+    rb_gc_mark(box->expanded_load_path);
+    rb_gc_mark(box->load_path_snapshot);
+    rb_gc_mark(box->load_path_check_cache);
+    rb_gc_mark(box->loaded_features);
+    rb_gc_mark(box->loaded_features_snapshot);
+    rb_gc_mark(box->loaded_features_realpaths);
+    rb_gc_mark(box->loaded_features_realpath_map);
+    if (box->loading_table) {
+        rb_mark_tbl(box->loading_table);
+    }
+    rb_gc_mark(box->ruby_dln_libmap);
+    rb_gc_mark(box->gvar_tbl);
+    if (box->classext_cow_classes) {
+        rb_mark_tbl(box->classext_cow_classes);
+    }
+}
+
+static int
+free_loading_table_entry(st_data_t key, st_data_t value, st_data_t arg)
+{
+    xfree((char *)key);
+    return ST_DELETE;
+}
+
+static int
+free_loaded_feature_index_i(st_data_t key, st_data_t value, st_data_t arg)
+{
+    if (!FIXNUM_P(value)) {
+        rb_darray_free((void *)value);
+    }
+    return ST_CONTINUE;
+}
+
+static void
+box_root_free(void *ptr)
+{
+    rb_box_t *box = (rb_box_t *)ptr;
+    if (box->loading_table) {
+        st_foreach(box->loading_table, free_loading_table_entry, 0);
+        st_free_table(box->loading_table);
+        box->loading_table = 0;
+    }
+
+    if (box->loaded_features_index) {
+        st_foreach(box->loaded_features_index, free_loaded_feature_index_i, 0);
+        st_free_table(box->loaded_features_index);
+    }
+}
+
+static int
+free_classext_for_box(st_data_t _key, st_data_t obj_value, st_data_t box_arg)
+{
+    rb_classext_t *ext;
+    VALUE obj = (VALUE)obj_value;
+    const rb_box_t *box = (const rb_box_t *)box_arg;
+
+    if (RB_TYPE_P(obj, T_CLASS) || RB_TYPE_P(obj, T_MODULE)) {
+        ext = rb_class_unlink_classext(obj, box);
+        rb_class_classext_free(obj, ext, false);
+    }
+    else if (RB_TYPE_P(obj, T_ICLASS)) {
+        ext = rb_class_unlink_classext(obj, box);
+        rb_iclass_classext_free(obj, ext, false);
+    }
+    else {
+        rb_bug("Invalid type of object in classext_cow_classes: %s", rb_type_str(BUILTIN_TYPE(obj)));
+    }
+    return ST_CONTINUE;
+}
+
+static void
+box_entry_free(void *ptr)
+{
+    const rb_box_t *box = (const rb_box_t *)ptr;
+
+    if (box->classext_cow_classes) {
+        st_foreach(box->classext_cow_classes, free_classext_for_box, (st_data_t)box);
+    }
+
+    cleanup_all_local_extensions(box->ruby_dln_libmap);
+
+    box_root_free(ptr);
+    xfree(ptr);
+}
+
+static size_t
+box_entry_memsize(const void *ptr)
+{
+    size_t size = sizeof(rb_box_t);
+    const rb_box_t *box = (const rb_box_t *)ptr;
+    if (box->loaded_features_index) {
+        size += rb_st_memsize(box->loaded_features_index);
+    }
+    if (box->loading_table) {
+        size += rb_st_memsize(box->loading_table);
+    }
+    return size;
+}
+
+static const rb_data_type_t rb_box_data_type = {
+    "Ruby::Box::Entry",
+    {
+        rb_box_entry_mark,
+        box_entry_free,
+        box_entry_memsize,
+        rb_box_gc_update_references,
+    },
+    0, 0, RUBY_TYPED_FREE_IMMEDIATELY // TODO: enable RUBY_TYPED_WB_PROTECTED when inserting write barriers
+};
+
+static const rb_data_type_t rb_root_box_data_type = {
+    "Ruby::Box::Root",
+    {
+        rb_box_entry_mark,
+        box_root_free,
+        box_entry_memsize,
+        rb_box_gc_update_references,
+    },
+    &rb_box_data_type, 0, RUBY_TYPED_FREE_IMMEDIATELY // TODO: enable RUBY_TYPED_WB_PROTECTED when inserting write barriers
+};
+
+VALUE
+rb_box_entry_alloc(VALUE klass)
+{
+    rb_box_t *entry;
+    VALUE obj = TypedData_Make_Struct(klass, rb_box_t, &rb_box_data_type, entry);
+    box_entry_initialize(entry);
+    return obj;
+}
+
+static rb_box_t *
+get_box_struct_internal(VALUE entry)
+{
+    rb_box_t *sval;
+    TypedData_Get_Struct(entry, rb_box_t, &rb_box_data_type, sval);
+    return sval;
+}
+
+rb_box_t *
+rb_get_box_t(VALUE box)
+{
+    VALUE entry;
+    ID id_box_entry;
+
+    VM_ASSERT(box);
+
+    if (NIL_P(box))
+        return root_box;
+
+    VM_ASSERT(BOX_OBJ_P(box));
+
+    CONST_ID(id_box_entry, "__box_entry__");
+    entry = rb_attr_get(box, id_box_entry);
+    return get_box_struct_internal(entry);
+}
+
+VALUE
+rb_get_box_object(rb_box_t *box)
+{
+    VM_ASSERT(box && box->box_object);
+    return box->box_object;
+}
+
+/*
+ *  call-seq:
+ *    Ruby::Box.new -> new_box
+ *
+ *  Returns a new Ruby::Box object.
+ */
+static VALUE
+box_initialize(VALUE box_value)
+{
+    rb_box_t *box;
+    rb_classext_t *object_classext;
+    VALUE entry;
+    ID id_box_entry;
+    CONST_ID(id_box_entry, "__box_entry__");
+
+    if (!rb_box_available()) {
+        rb_raise(rb_eRuntimeError, "Ruby Box is disabled. Set RUBY_BOX=1 environment variable to use Ruby::Box.");
+    }
+
+    entry = rb_class_new_instance_pass_kw(0, NULL, rb_cBoxEntry);
+    box = get_box_struct_internal(entry);
+
+    box->box_object = box_value;
+    box->box_id = box_generate_id();
+    rb_define_singleton_method(box->load_path, "resolve_feature_path", rb_resolve_feature_path, 1);
+
+    // Set the Ruby::Box object unique/consistent from any boxes to have just single
+    // constant table from any view of every (including main) box.
+    // If a code in the box adds a constant, the constant will be visible even from root/main.
+    RCLASS_SET_PRIME_CLASSEXT_WRITABLE(box_value, true);
+
+    // Get a clean constant table of Object even by writable one
+    // because ns was just created, so it has not touched any constants yet.
+    object_classext = RCLASS_EXT_WRITABLE_IN_BOX(rb_cObject, box);
+    RCLASS_SET_CONST_TBL(box_value, RCLASSEXT_CONST_TBL(object_classext), true);
+
+    rb_ivar_set(box_value, id_box_entry, entry);
+
+    return box_value;
+}
+
+/*
+ *  call-seq:
+ *    Ruby::Box.enabled? -> true or false
+ *
+ *  Returns +true+ if Ruby::Box is enabled.
+ */
+static VALUE
+rb_box_s_getenabled(VALUE recv)
+{
+    return RBOOL(rb_box_available());
+}
+
+/*
+ *  call-seq:
+ *    Ruby::Box.current -> box, nil or false
+ *
+ *  Returns the current box.
+ *  Returns +nil+ if Ruby Box is not enabled.
+ */
+static VALUE
+rb_box_s_current(VALUE recv)
+{
+    const rb_box_t *box;
+
+    if (!rb_box_available())
+        return Qnil;
+
+    box = rb_vm_current_box(GET_EC());
+    VM_ASSERT(box && box->box_object);
+    return box->box_object;
+}
+
+/*
+ *  call-seq:
+ *    load_path -> array
+ *
+ *  Returns box local load path.
+ */
+static VALUE
+rb_box_load_path(VALUE box)
+{
+    VM_ASSERT(BOX_OBJ_P(box));
+    return rb_get_box_t(box)->load_path;
+}
+
+#ifdef _WIN32
+UINT rb_w32_system_tmpdir(WCHAR *path, UINT len);
+#endif
+
+/* Copied from mjit.c Ruby 3.0.3 */
+static char *
+system_default_tmpdir(void)
+{
+    // c.f. ext/etc/etc.c:etc_systmpdir()
+#ifdef _WIN32
+    WCHAR tmppath[_MAX_PATH];
+    UINT len = rb_w32_system_tmpdir(tmppath, numberof(tmppath));
+    if (len) {
+        int blen = WideCharToMultiByte(CP_UTF8, 0, tmppath, len, NULL, 0, NULL, NULL);
+        char *tmpdir = xmalloc(blen + 1);
+        WideCharToMultiByte(CP_UTF8, 0, tmppath, len, tmpdir, blen, NULL, NULL);
+        tmpdir[blen] = '\0';
+        return tmpdir;
+    }
+#elif defined _CS_DARWIN_USER_TEMP_DIR
+    char path[MAXPATHLEN];
+    size_t len = confstr(_CS_DARWIN_USER_TEMP_DIR, path, sizeof(path));
+    if (len > 0) {
+        char *tmpdir = xmalloc(len);
+        if (len > sizeof(path)) {
+            confstr(_CS_DARWIN_USER_TEMP_DIR, tmpdir, len);
+        }
+        else {
+            memcpy(tmpdir, path, len);
+        }
+        return tmpdir;
+    }
+#endif
+    return 0;
+}
+
+static int
+check_tmpdir(const char *dir)
+{
+    struct stat st;
+
+    if (!dir) return FALSE;
+    if (stat(dir, &st)) return FALSE;
+#ifndef S_ISDIR
+#   define S_ISDIR(m) (((m) & S_IFMT) == S_IFDIR)
+#endif
+    if (!S_ISDIR(st.st_mode)) return FALSE;
+#ifndef _WIN32
+# ifndef S_IWOTH
+#   define S_IWOTH 002
+# endif
+    if (st.st_mode & S_IWOTH) {
+# ifdef S_ISVTX
+        if (!(st.st_mode & S_ISVTX)) return FALSE;
+# else
+        return FALSE;
+# endif
+    }
+    if (access(dir, W_OK)) return FALSE;
+#endif
+    return TRUE;
+}
+
+static char *
+system_tmpdir(void)
+{
+    char *tmpdir;
+# define RETURN_ENV(name) \
+    if (check_tmpdir(tmpdir = getenv(name))) return ruby_strdup(tmpdir)
+    RETURN_ENV("TMPDIR");
+    RETURN_ENV("TMP");
+    tmpdir = system_default_tmpdir();
+    if (check_tmpdir(tmpdir)) return tmpdir;
+    return ruby_strdup("/tmp");
+# undef RETURN_ENV
+}
+
+/* end of copy */
+
+static int
+sprint_ext_filename(char *str, size_t size, long box_id, const char *prefix, const char *basename)
+{
+    if (tmp_dir_has_dirsep) {
+        return snprintf(str, size, "%s%sp%"PRI_PIDT_PREFIX"u_%ld_%s", tmp_dir, prefix, getpid(), box_id, basename);
+    }
+    return snprintf(str, size, "%s%s%sp%"PRI_PIDT_PREFIX"u_%ld_%s", tmp_dir, DIRSEP, prefix, getpid(), box_id, basename);
+}
+
+enum copy_error_type {
+    COPY_ERROR_NONE,
+    COPY_ERROR_SRC_OPEN,
+    COPY_ERROR_DST_OPEN,
+    COPY_ERROR_SRC_READ,
+    COPY_ERROR_DST_WRITE,
+    COPY_ERROR_SRC_STAT,
+    COPY_ERROR_DST_CHMOD,
+    COPY_ERROR_SYSERR
+};
+
+static const char *
+copy_ext_file_error(char *message, size_t size, int copy_retvalue)
+{
+#ifdef _WIN32
+    int error = GetLastError();
+    char *p = message;
+    size_t len = snprintf(message, size, "%d: ", error);
+
+#define format_message(sublang) FormatMessage(\
+        FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS,	\
+        NULL, error, MAKELANGID(LANG_NEUTRAL, (sublang)),		\
+        message + len, size - len, NULL)
+    if (format_message(SUBLANG_ENGLISH_US) == 0)
+        format_message(SUBLANG_DEFAULT);
+    for (p = message + len; *p; p++) {
+        if (*p == '\n' || *p == '\r')
+            *p = ' ';
+    }
+#else
+    switch (copy_retvalue) {
+      case COPY_ERROR_SRC_OPEN:
+        strlcpy(message, "can't open the extension path", size);
+        break;
+      case COPY_ERROR_DST_OPEN:
+        strlcpy(message, "can't open the file to write", size);
+        break;
+      case COPY_ERROR_SRC_READ:
+        strlcpy(message, "failed to read the extension path", size);
+        break;
+      case COPY_ERROR_DST_WRITE:
+        strlcpy(message, "failed to write the extension path", size);
+        break;
+      case COPY_ERROR_SRC_STAT:
+        strlcpy(message, "failed to stat the extension path to copy permissions", size);
+        break;
+      case COPY_ERROR_DST_CHMOD:
+        strlcpy(message, "failed to set permissions to the copied extension path", size);
+        break;
+      case COPY_ERROR_SYSERR:
+        strlcpy(message, strerror(errno), size);
+        break;
+      case COPY_ERROR_NONE: /* shouldn't be called */
+      default:
+        rb_bug("unknown return value of copy_ext_file: %d", copy_retvalue);
+    }
+#endif
+    return message;
+}
+
+#ifndef _WIN32
+static enum copy_error_type
+copy_stream(int src_fd, int dst_fd)
+{
+    char buffer[1024];
+    ssize_t rsize;
+
+    while ((rsize = read(src_fd, buffer, sizeof(buffer))) != 0) {
+        if (rsize < 0) return COPY_ERROR_SRC_READ;
+        for (size_t written = 0; written < (size_t)rsize;) {
+            ssize_t wsize = write(dst_fd, buffer+written, rsize-written);
+            if (wsize < 0) return COPY_ERROR_DST_WRITE;
+            written += (size_t)wsize;
+        }
+    }
+    return COPY_ERROR_NONE;
+}
+#endif
+
+static enum copy_error_type
+copy_ext_file(const char *src_path, const char *dst_path)
+{
+#if defined(_WIN32)
+    WCHAR *w_src = rb_w32_mbstr_to_wstr(CP_UTF8, src_path, -1, NULL);
+    WCHAR *w_dst = rb_w32_mbstr_to_wstr(CP_UTF8, dst_path, -1, NULL);
+    if (!w_src || !w_dst) {
+        free(w_src);
+        free(w_dst);
+        rb_memerror();
+    }
+
+    enum copy_error_type rvalue = CopyFileW(w_src, w_dst, TRUE) ?
+        COPY_ERROR_NONE : COPY_ERROR_SYSERR;
+    free(w_src);
+    free(w_dst);
+    return rvalue;
+#else
+# ifdef O_BINARY
+    const int bin = O_BINARY;
+# else
+    const int bin = 0;
+# endif
+# ifdef O_CLOEXEC
+    const int cloexec = O_CLOEXEC;
+# else
+    const int cloexec = 0;
+# endif
+    const int src_fd = open(src_path, O_RDONLY|cloexec|bin);
+    if (src_fd < 0) return COPY_ERROR_SRC_OPEN;
+    if (!cloexec) rb_maygvl_fd_fix_cloexec(src_fd);
+
+    struct stat src_st;
+    if (fstat(src_fd, &src_st)) {
+        close(src_fd);
+        return COPY_ERROR_SRC_STAT;
+    }
+
+    const int dst_fd = open(dst_path, O_WRONLY|O_CREAT|O_EXCL|cloexec|bin, S_IRWXU);
+    if (dst_fd < 0) {
+        close(src_fd);
+        return COPY_ERROR_DST_OPEN;
+    }
+    if (!cloexec) rb_maygvl_fd_fix_cloexec(dst_fd);
+
+    enum copy_error_type ret = COPY_ERROR_NONE;
+
+    if (fchmod(dst_fd, src_st.st_mode & 0777)) {
+        ret = COPY_ERROR_DST_CHMOD;
+        goto done;
+    }
+
+    const size_t count_max = (SIZE_MAX >> 1) + 1;
+    (void)count_max;
+
+# ifdef HAVE_COPY_FILE_RANGE
+    for (;;) {
+        ssize_t written = copy_file_range(src_fd, NULL, dst_fd, NULL, count_max, 0);
+        if (written == 0) goto done;
+        if (written < 0) break;
+    }
+# endif
+# ifdef HAVE_FCOPYFILE
+    if (fcopyfile(src_fd, dst_fd, NULL, COPYFILE_DATA) == 0) {
+        goto done;
+    }
+# endif
+# ifdef USE_SENDFILE
+    for (;;) {
+        ssize_t written = sendfile(src_fd, dst_fd, NULL count_max);
+        if (written == 0) goto done;
+        if (written < 0) break;
+    }
+# endif
+    ret = copy_stream(src_fd, dst_fd);
+
+  done:
+    close(src_fd);
+    if (dst_fd >= 0) close(dst_fd);
+    if (ret != COPY_ERROR_NONE) unlink(dst_path);
+    return ret;
+#endif
+}
+
+#if defined __CYGWIN__ || defined DOSISH
+#define isdirsep(x) ((x) == '/' || (x) == '\\')
+#else
+#define isdirsep(x) ((x) == '/')
+#endif
+
+#define IS_SOEXT(e) (strcmp((e), ".so") == 0 || strcmp((e), ".o") == 0)
+#define IS_DLEXT(e) (strcmp((e), DLEXT) == 0)
+
+static void
+fname_without_suffix(const char *fname, char *rvalue, size_t rsize)
+{
+    size_t len = strlen(fname);
+    const char *pos;
+    for (pos = fname + len; pos > fname; pos--) {
+        if (IS_SOEXT(pos) || IS_DLEXT(pos)) {
+            len = pos - fname;
+            break;
+        }
+        if (fname + len - pos > DLEXT_MAXLEN) break;
+    }
+    if (len > rsize - 1) len = rsize - 1;
+    memcpy(rvalue, fname, len);
+    rvalue[len] = '\0';
+}
+
+static void
+escaped_basename(const char *path, const char *fname, char *rvalue, size_t rsize)
+{
+    char *pos;
+    const char *leaf = path, *found;
+    // `leaf + 1` looks uncomfortable (when leaf == path), but fname must not be the top-dir itself
+    while ((found = strstr(leaf + 1, fname)) != NULL) {
+        leaf = found; // find the last occurrence for the path like /etc/my-crazy-lib-dir/etc.so
+    }
+    strlcpy(rvalue, leaf, rsize);
+    for (pos = rvalue; *pos; pos++) {
+        if (isdirsep(*pos)) {
+            *pos = '+';
+        }
+    }
+}
+
+static void
+box_ext_cleanup_mark(void *p)
+{
+    rb_gc_mark((VALUE)p);
+}
+
+static void
+box_ext_cleanup_free(void *p)
+{
+    VALUE path = (VALUE)p;
+    unlink(RSTRING_PTR(path));
+}
+
+static const rb_data_type_t box_ext_cleanup_type = {
+    "box_ext_cleanup",
+    {box_ext_cleanup_mark, box_ext_cleanup_free},
+    .flags = RUBY_TYPED_FREE_IMMEDIATELY,
+};
+
+void
+rb_box_cleanup_local_extension(VALUE cleanup)
+{
+    void *p = DATA_PTR(cleanup);
+    DATA_PTR(cleanup) = NULL;
+#ifndef _WIN32
+    if (p) box_ext_cleanup_free(p);
+#endif
+    (void)p;
+}
+
+static int
+cleanup_local_extension_i(VALUE key, VALUE value, VALUE arg)
+{
+#if defined(_WIN32)
+    HMODULE h = (HMODULE)NUM2PTR(value);
+    WCHAR module_path[MAXPATHLEN];
+    DWORD len = GetModuleFileNameW(h, module_path, numberof(module_path));
+
+    FreeLibrary(h);
+    if (len > 0 && len < numberof(module_path)) DeleteFileW(module_path);
+#endif
+    return ST_DELETE;
+}
+
+static void
+cleanup_all_local_extensions(VALUE libmap)
+{
+    rb_hash_foreach(libmap, cleanup_local_extension_i, 0);
+}
+
+VALUE
+rb_box_local_extension(VALUE box_value, VALUE fname, VALUE path, VALUE *cleanup)
+{
+    char ext_path[MAXPATHLEN], fname2[MAXPATHLEN], basename[MAXPATHLEN];
+    int wrote;
+    const char *src_path = RSTRING_PTR(path), *fname_ptr = RSTRING_PTR(fname);
+    rb_box_t *box = rb_get_box_t(box_value);
+
+    fname_without_suffix(fname_ptr, fname2, sizeof(fname2));
+    escaped_basename(src_path, fname2, basename, sizeof(basename));
+
+    wrote = sprint_ext_filename(ext_path, sizeof(ext_path), box->box_id, BOX_TMP_PREFIX, basename);
+    if (wrote >= (int)sizeof(ext_path)) {
+        rb_bug("Extension file path in the box was too long");
+    }
+    VALUE new_path = rb_str_new_cstr(ext_path);
+    *cleanup = TypedData_Wrap_Struct(0, &box_ext_cleanup_type, NULL);
+    enum copy_error_type copy_error = copy_ext_file(src_path, ext_path);
+    if (copy_error) {
+        char message[1024];
+        copy_ext_file_error(message, sizeof(message), copy_error);
+        rb_raise(rb_eLoadError, "can't prepare the extension file for Ruby Box (%s from %"PRIsVALUE"): %s", ext_path, path, message);
+    }
+    DATA_PTR(*cleanup) = (void *)new_path;
+    return new_path;
+}
+
+static VALUE
+rb_box_load(int argc, VALUE *argv, VALUE box)
+{
+    VALUE fname, wrap;
+    rb_scan_args(argc, argv, "11", &fname, &wrap);
+
+    rb_vm_frame_flag_set_box_require(GET_EC());
+
+    VALUE args = rb_ary_new_from_args(2, fname, wrap);
+    return rb_load_entrypoint(args);
+}
+
+static VALUE
+rb_box_require(VALUE box, VALUE fname)
+{
+    rb_vm_frame_flag_set_box_require(GET_EC());
+
+    return rb_require_string(fname);
+}
+
+static VALUE
+rb_box_require_relative(VALUE box, VALUE fname)
+{
+    rb_vm_frame_flag_set_box_require(GET_EC());
+
+    return rb_require_relative_entrypoint(fname);
+}
+
+static void
+initialize_root_box(void)
+{
+    rb_vm_t *vm = GET_VM();
+    rb_box_t *root = (rb_box_t *)rb_root_box();
+
+    root->load_path = rb_ary_new();
+    root->expanded_load_path = rb_ary_hidden_new(0);
+    root->load_path_snapshot = rb_ary_hidden_new(0);
+    root->load_path_check_cache = 0;
+    rb_define_singleton_method(root->load_path, "resolve_feature_path", rb_resolve_feature_path, 1);
+
+    root->loaded_features = rb_ary_new();
+    root->loaded_features_snapshot = rb_ary_hidden_new(0);
+    root->loaded_features_index = st_init_numtable();
+    root->loaded_features_realpaths = rb_hash_new();
+    rb_obj_hide(root->loaded_features_realpaths);
+    root->loaded_features_realpath_map = rb_hash_new();
+    rb_obj_hide(root->loaded_features_realpath_map);
+
+    root->ruby_dln_libmap = rb_hash_new_with_size(0);
+    root->gvar_tbl = rb_hash_new_with_size(0);
+    root->classext_cow_classes = NULL; // classext CoW never happen on the root box
+
+    vm->root_box = root;
+
+    if (rb_box_available()) {
+        VALUE root_box, entry;
+        ID id_box_entry;
+        CONST_ID(id_box_entry, "__box_entry__");
+
+        root_box = rb_obj_alloc(rb_cBox);
+        RCLASS_SET_PRIME_CLASSEXT_WRITABLE(root_box, true);
+        RCLASS_SET_CONST_TBL(root_box, RCLASSEXT_CONST_TBL(RCLASS_EXT_PRIME(rb_cObject)), true);
+
+        root->box_id = box_generate_id();
+        root->box_object = root_box;
+
+        entry = TypedData_Wrap_Struct(rb_cBoxEntry, &rb_root_box_data_type, root);
+        rb_ivar_set(root_box, id_box_entry, entry);
+    }
+    else {
+        root->box_id = 1;
+        root->box_object = Qnil;
+    }
+}
+
+static VALUE
+rb_box_eval(VALUE box_value, VALUE str)
+{
+    const rb_iseq_t *iseq;
+    const rb_box_t *box;
+
+    StringValue(str);
+
+    iseq = rb_iseq_compile_iseq(str, rb_str_new_cstr("eval"));
+    VM_ASSERT(iseq);
+
+    box = (const rb_box_t *)rb_get_box_t(box_value);
+
+    return rb_iseq_eval(iseq, box);
+}
+
+static int box_experimental_warned = 0;
+
+RUBY_EXTERN const char ruby_api_version_name[];
+
+void
+rb_initialize_main_box(void)
+{
+    rb_box_t *box;
+    VALUE main_box_value;
+    rb_vm_t *vm = GET_VM();
+
+    VM_ASSERT(rb_box_available());
+
+    if (!box_experimental_warned) {
+        rb_category_warn(RB_WARN_CATEGORY_EXPERIMENTAL,
+                         "Ruby::Box is experimental, and the behavior may change in the future!\n"
+                         "See https://docs.ruby-lang.org/en/%s/Ruby/Box.html for known issues, etc.",
+                         ruby_api_version_name);
+        box_experimental_warned = 1;
+    }
+
+    main_box_value = rb_class_new_instance(0, NULL, rb_cBox);
+    VM_ASSERT(BOX_OBJ_P(main_box_value));
+    box = rb_get_box_t(main_box_value);
+    box->box_object = main_box_value;
+    box->is_user = true;
+    box->is_optional = false;
+
+    rb_const_set(rb_cBox, rb_intern("MAIN"), main_box_value);
+
+    vm->main_box = main_box = box;
+
+    // create the writable classext of ::Object explicitly to finalize the set of visible top-level constants
+    RCLASS_EXT_WRITABLE_IN_BOX(rb_cObject, box);
+}
+
+static VALUE
+rb_box_inspect(VALUE obj)
+{
+    rb_box_t *box;
+    VALUE r;
+    if (obj == Qfalse) {
+        r = rb_str_new_cstr("#<Ruby::Box:root>");
+        return r;
+    }
+    box = rb_get_box_t(obj);
+    r = rb_str_new_cstr("#<Ruby::Box:");
+    rb_str_concat(r, rb_funcall(LONG2NUM(box->box_id), rb_intern("to_s"), 0));
+    if (BOX_ROOT_P(box)) {
+        rb_str_cat_cstr(r, ",root");
+    }
+    if (BOX_USER_P(box)) {
+        rb_str_cat_cstr(r, ",user");
+    }
+    if (BOX_MAIN_P(box)) {
+        rb_str_cat_cstr(r, ",main");
+    }
+    else if (BOX_OPTIONAL_P(box)) {
+        rb_str_cat_cstr(r, ",optional");
+    }
+    rb_str_cat_cstr(r, ">");
+    return r;
+}
+
+static VALUE
+rb_box_loading_func(int argc, VALUE *argv, VALUE _self)
+{
+    rb_vm_frame_flag_set_box_require(GET_EC());
+    return rb_call_super(argc, argv);
+}
+
+static void
+box_define_loader_method(const char *name)
+{
+    rb_define_private_method(rb_mBoxLoader, name, rb_box_loading_func, -1);
+    rb_define_singleton_method(rb_mBoxLoader, name, rb_box_loading_func, -1);
+}
+
+void
+Init_root_box(void)
+{
+    root_box->loading_table = st_init_strtable();
+}
+
+void
+Init_enable_box(void)
+{
+    const char *env = getenv("RUBY_BOX");
+    if (env && strlen(env) == 1 && env[0] == '1') {
+        ruby_box_enabled = true;
+    }
+    else {
+        ruby_box_init_done = true;
+    }
+}
+
+/* :nodoc: */
+static VALUE
+rb_box_s_root(VALUE recv)
+{
+    return root_box->box_object;
+}
+
+/* :nodoc: */
+static VALUE
+rb_box_s_main(VALUE recv)
+{
+    return main_box->box_object;
+}
+
+/* :nodoc: */
+static VALUE
+rb_box_root_p(VALUE box_value)
+{
+    const rb_box_t *box = (const rb_box_t *)rb_get_box_t(box_value);
+    return RBOOL(BOX_ROOT_P(box));
+}
+
+/* :nodoc: */
+static VALUE
+rb_box_main_p(VALUE box_value)
+{
+    const rb_box_t *box = (const rb_box_t *)rb_get_box_t(box_value);
+    return RBOOL(BOX_MAIN_P(box));
+}
+
+#if RUBY_DEBUG
+
+static const char *
+classname(VALUE klass)
+{
+    VALUE p;
+    if (!klass) {
+        return "Qfalse";
+    }
+    p = RCLASSEXT_CLASSPATH(RCLASS_EXT_PRIME(klass));
+    if (RTEST(p))
+        return RSTRING_PTR(p);
+    if (RB_TYPE_P(klass, T_CLASS) || RB_TYPE_P(klass, T_MODULE) || RB_TYPE_P(klass, T_ICLASS))
+        return "AnyClassValue";
+    return "NonClassValue";
+}
+
+static enum rb_id_table_iterator_result
+dump_classext_methods_i(ID mid, VALUE _val, void *data)
+{
+    VALUE ary = (VALUE)data;
+    rb_ary_push(ary, rb_id2str(mid));
+    return ID_TABLE_CONTINUE;
+}
+
+static enum rb_id_table_iterator_result
+dump_classext_constants_i(ID mid, VALUE _val, void *data)
+{
+    VALUE ary = (VALUE)data;
+    rb_ary_push(ary, rb_id2str(mid));
+    return ID_TABLE_CONTINUE;
+}
+
+static void
+dump_classext_i(rb_classext_t *ext, bool is_prime, VALUE _recv, void *data)
+{
+    char buf[4096];
+    struct rb_id_table *tbl;
+    VALUE ary, res = (VALUE)data;
+
+    snprintf(buf, 4096, "Ruby::Box %ld:%s classext %p\n",
+             RCLASSEXT_BOX(ext)->box_id, is_prime ? " prime" : "", (void *)ext);
+    rb_str_cat_cstr(res, buf);
+
+    snprintf(buf, 2048, "  Super: %s\n", classname(RCLASSEXT_SUPER(ext)));
+    rb_str_cat_cstr(res, buf);
+
+    tbl = RCLASSEXT_M_TBL(ext);
+    if (tbl) {
+        ary = rb_ary_new_capa((long)rb_id_table_size(tbl));
+        rb_id_table_foreach(RCLASSEXT_M_TBL(ext), dump_classext_methods_i, (void *)ary);
+        rb_ary_sort_bang(ary);
+        snprintf(buf, 4096, "  Methods(%ld): ", RARRAY_LEN(ary));
+        rb_str_cat_cstr(res, buf);
+        rb_str_concat(res, rb_ary_join(ary, rb_str_new_cstr(",")));
+        rb_str_cat_cstr(res, "\n");
+    }
+    else {
+        rb_str_cat_cstr(res, "  Methods(0): .\n");
+    }
+
+    tbl = RCLASSEXT_CONST_TBL(ext);
+    if (tbl) {
+        ary = rb_ary_new_capa((long)rb_id_table_size(tbl));
+        rb_id_table_foreach(tbl, dump_classext_constants_i, (void *)ary);
+        rb_ary_sort_bang(ary);
+        snprintf(buf, 4096, "  Constants(%ld): ", RARRAY_LEN(ary));
+        rb_str_cat_cstr(res, buf);
+        rb_str_concat(res, rb_ary_join(ary, rb_str_new_cstr(",")));
+        rb_str_cat_cstr(res, "\n");
+    }
+    else {
+        rb_str_cat_cstr(res, "  Constants(0): .\n");
+    }
+}
+
+/* :nodoc: */
+static VALUE
+rb_f_dump_classext(VALUE recv, VALUE klass)
+{
+    /*
+     * The desired output String value is:
+     * Class: 0x88800932 (String) [singleton]
+     * Prime classext box(2,main), readable(t), writable(f)
+     * Non-prime classexts: 3
+     * Box 2: prime classext 0x88800933
+     *   Super: Object
+     *   Methods(43): aaaaa, bbbb, cccc, dddd, eeeee, ffff, gggg, hhhhh, ...
+     *   Constants(12): FOO, Bar, ...
+     * Box 5: classext 0x88800934
+     *   Super: Object
+     *   Methods(43): aaaaa, bbbb, cccc, dddd, eeeee, ffff, gggg, hhhhh, ...
+     *   Constants(12): FOO, Bar, ...
+     */
+    char buf[2048];
+    VALUE res;
+    const rb_classext_t *ext;
+    const rb_box_t *box;
+    st_table *classext_tbl;
+
+    if (!(RB_TYPE_P(klass, T_CLASS) || RB_TYPE_P(klass, T_MODULE))) {
+        snprintf(buf, 2048, "Non-class/module value: %p (%s)\n", (void *)klass, rb_type_str(BUILTIN_TYPE(klass)));
+        return rb_str_new_cstr(buf);
+    }
+
+    if (RB_TYPE_P(klass, T_CLASS)) {
+        snprintf(buf, 2048, "Class: %p (%s)%s\n",
+                 (void *)klass, classname(klass), RCLASS_SINGLETON_P(klass) ? " [singleton]" : "");
+    }
+    else {
+        snprintf(buf, 2048, "Module: %p (%s)\n", (void *)klass, classname(klass));
+    }
+    res = rb_str_new_cstr(buf);
+
+    ext = RCLASS_EXT_PRIME(klass);
+    box = RCLASSEXT_BOX(ext);
+    snprintf(buf, 2048, "Prime classext box(%ld,%s), readable(%s), writable(%s)\n",
+             box->box_id,
+             BOX_ROOT_P(box) ? "root" : (BOX_MAIN_P(box) ? "main" : "optional"),
+             RCLASS_PRIME_CLASSEXT_READABLE_P(klass) ? "t" : "f",
+             RCLASS_PRIME_CLASSEXT_WRITABLE_P(klass) ? "t" : "f");
+    rb_str_cat_cstr(res, buf);
+
+    classext_tbl = RCLASS_CLASSEXT_TBL(klass);
+    if (!classext_tbl) {
+        rb_str_cat_cstr(res, "Non-prime classexts: 0\n");
+    }
+    else {
+        snprintf(buf, 2048, "Non-prime classexts: %zu\n", st_table_size(classext_tbl));
+        rb_str_cat_cstr(res, buf);
+    }
+
+    rb_class_classext_foreach(klass, dump_classext_i, (void *)res);
+
+    return res;
+}
+
+#endif /* RUBY_DEBUG */
+
+/*
+ *  Document-class: Ruby::Box
+ *
+ *  :markup: markdown
+ *  :include: doc/language/box.md
+ */
+void
+Init_Box(void)
+{
+    tmp_dir = system_tmpdir();
+    tmp_dir_has_dirsep = (strcmp(tmp_dir + (strlen(tmp_dir) - strlen(DIRSEP)), DIRSEP) == 0);
+
+    VALUE mRuby = rb_define_module("Ruby");
+
+    rb_cBox = rb_define_class_under(mRuby, "Box", rb_cModule);
+    rb_define_method(rb_cBox, "initialize", box_initialize, 0);
+
+    /* :nodoc: */
+    rb_cBoxEntry = rb_define_class_under(rb_cBox, "Entry", rb_cObject);
+    rb_define_alloc_func(rb_cBoxEntry, rb_box_entry_alloc);
+
+    initialize_root_box();
+
+    /* :nodoc: */
+    rb_mBoxLoader = rb_define_module_under(rb_cBox, "Loader");
+    box_define_loader_method("require");
+    box_define_loader_method("require_relative");
+    box_define_loader_method("load");
+
+    if (rb_box_available()) {
+        rb_include_module(rb_cObject, rb_mBoxLoader);
+
+        rb_define_singleton_method(rb_cBox, "root", rb_box_s_root, 0);
+        rb_define_singleton_method(rb_cBox, "main", rb_box_s_main, 0);
+        rb_define_method(rb_cBox, "root?", rb_box_root_p, 0);
+        rb_define_method(rb_cBox, "main?", rb_box_main_p, 0);
+
+#if RUBY_DEBUG
+        rb_define_global_function("dump_classext", rb_f_dump_classext, 1);
+#endif
+    }
+
+    rb_define_singleton_method(rb_cBox, "enabled?", rb_box_s_getenabled, 0);
+    rb_define_singleton_method(rb_cBox, "current", rb_box_s_current, 0);
+
+    rb_define_method(rb_cBox, "load_path", rb_box_load_path, 0);
+    rb_define_method(rb_cBox, "load", rb_box_load, -1);
+    rb_define_method(rb_cBox, "require", rb_box_require, 1);
+    rb_define_method(rb_cBox, "require_relative", rb_box_require_relative, 1);
+    rb_define_method(rb_cBox, "eval", rb_box_eval, 1);
+
+    rb_define_method(rb_cBox, "inspect", rb_box_inspect, 0);
+}
diff --git a/builtin.c b/builtin.c
index 21fff95650..6cc9790466 100644
--- a/builtin.c
+++ b/builtin.c
@@ -3,15 +3,15 @@
 #include "iseq.h"
 #include "builtin.h"
 
-#ifdef CROSS_COMPILING
+#include "builtin_binary.rbbin"
 
-#define INCLUDED_BY_BUILTIN_C 1
+#ifndef BUILTIN_BINARY_SIZE
+
+#define BUILTIN_LOADED(feature_name, iseq) ((void)0)
 #include "mini_builtin.c"
 
 #else
 
-#include "builtin_binary.inc"
-
 static const unsigned char *
 bin4feature(const struct builtin_binary *bb, const char *feature, size_t *psize)
 {
@@ -32,31 +32,43 @@ builtin_lookup(const char *feature, size_t *psize)
     return bin;
 }
 
-void
-rb_load_with_builtin_functions(const char *feature_name, const struct rb_builtin_function *table)
+static void
+load_with_builtin_functions(const char *feature_name, const struct rb_builtin_function *table)
 {
     // search binary
     size_t size;
     const unsigned char *bin = builtin_lookup(feature_name, &size);
     if (! bin) {
-        rb_bug("builtin_lookup: can not find %s\n", feature_name);
+        rb_bug("builtin_lookup: can not find %s", feature_name);
     }
 
     // load binary
     rb_vm_t *vm = GET_VM();
     if (vm->builtin_function_table != NULL) rb_bug("vm->builtin_function_table should be NULL.");
     vm->builtin_function_table = table;
-    vm->builtin_inline_index = 0;
     const rb_iseq_t *iseq = rb_iseq_ibf_load_bytes((const char *)bin, size);
+    ASSUME(iseq); // otherwise an exception should have raised
     vm->builtin_function_table = NULL;
 
     // exec
-    rb_iseq_eval(rb_iseq_check(iseq));
+    rb_iseq_eval(rb_iseq_check(iseq), rb_root_box()); // builtin functions are loaded in the root box
+}
+
+void
+rb_load_with_builtin_functions(const char *feature_name, const struct rb_builtin_function *table)
+{
+    load_with_builtin_functions(feature_name, table);
 }
 
 #endif
 
 void
+rb_free_loaded_builtin_table(void)
+{
+    // do nothing
+}
+
+void
 Init_builtin(void)
 {
     // nothing
@@ -65,5 +77,11 @@ Init_builtin(void)
 void
 Init_builtin_features(void)
 {
-    rb_load_with_builtin_functions("gem_prelude", NULL);
+
+#ifdef BUILTIN_BINARY_SIZE
+
+    load_with_builtin_functions("gem_prelude", NULL);
+
+#endif
+
 }
diff --git a/builtin.h b/builtin.h
index 96339afdb5..fd1c4c307f 100644
--- a/builtin.h
+++ b/builtin.h
@@ -11,17 +11,13 @@ struct rb_builtin_function {
     // for load
     const int index;
     const char * const name;
-
-    // for jit
-    void (*compiler)(FILE *, long, unsigned, bool);
 };
 
-#define RB_BUILTIN_FUNCTION(_i, _name, _fname, _arity, _compiler) {\
-  .name = #_name, \
-  .func_ptr = (void *)_fname, \
+#define RB_BUILTIN_FUNCTION(_i, _name, _fname, _arity) {\
+  .name = _i < 0 ? NULL : #_name, \
+  .func_ptr = (void *)(uintptr_t)_fname, \
   .argc = _arity, \
   .index = _i, \
-  .compiler = _compiler, \
 }
 
 void rb_load_with_builtin_functions(const char *feature_name, const struct rb_builtin_function *table);
@@ -33,28 +29,65 @@ typedef struct rb_execution_context_struct rb_execution_context_t;
 
 /* The following code is generated by the following Ruby script:
 
+typedef = proc {|i, args|
+  "typedef VALUE (*rb_builtin_arity#{i}_function_type)(rb_execution_context_t *ec, VALUE self#{args});"
+}
+puts typedef[0, ""]
+(1..15).each {|i|
+  puts typedef[i, ",\n        " + (0...i).map{"VALUE"}.join(", ")]
+}
 16.times{|i|
-  args = (i > 0 ? ', ' : '') + (0...i).map{"VALUE"}.join(', ')
-  puts "static inline void rb_builtin_function_check_arity#{i}(VALUE (*f)(rb_execution_context_t *ec, VALUE self#{args})){}"
+  puts "static inline void rb_builtin_function_check_arity#{i}(rb_builtin_arity#{i}_function_type f){}"
 }
 */
 
-static inline void rb_builtin_function_check_arity0(VALUE (*f)(rb_execution_context_t *ec, VALUE self)){}
-static inline void rb_builtin_function_check_arity1(VALUE (*f)(rb_execution_context_t *ec, VALUE self, VALUE)){}
-static inline void rb_builtin_function_check_arity2(VALUE (*f)(rb_execution_context_t *ec, VALUE self, VALUE, VALUE)){}
-static inline void rb_builtin_function_check_arity3(VALUE (*f)(rb_execution_context_t *ec, VALUE self, VALUE, VALUE, VALUE)){}
-static inline void rb_builtin_function_check_arity4(VALUE (*f)(rb_execution_context_t *ec, VALUE self, VALUE, VALUE, VALUE, VALUE)){}
-static inline void rb_builtin_function_check_arity5(VALUE (*f)(rb_execution_context_t *ec, VALUE self, VALUE, VALUE, VALUE, VALUE, VALUE)){}
-static inline void rb_builtin_function_check_arity6(VALUE (*f)(rb_execution_context_t *ec, VALUE self, VALUE, VALUE, VALUE, VALUE, VALUE, VALUE)){}
-static inline void rb_builtin_function_check_arity7(VALUE (*f)(rb_execution_context_t *ec, VALUE self, VALUE, VALUE, VALUE, VALUE, VALUE, VALUE, VALUE)){}
-static inline void rb_builtin_function_check_arity8(VALUE (*f)(rb_execution_context_t *ec, VALUE self, VALUE, VALUE, VALUE, VALUE, VALUE, VALUE, VALUE, VALUE)){}
-static inline void rb_builtin_function_check_arity9(VALUE (*f)(rb_execution_context_t *ec, VALUE self, VALUE, VALUE, VALUE, VALUE, VALUE, VALUE, VALUE, VALUE, VALUE)){}
-static inline void rb_builtin_function_check_arity10(VALUE (*f)(rb_execution_context_t *ec, VALUE self, VALUE, VALUE, VALUE, VALUE, VALUE, VALUE, VALUE, VALUE, VALUE, VALUE)){}
-static inline void rb_builtin_function_check_arity11(VALUE (*f)(rb_execution_context_t *ec, VALUE self, VALUE, VALUE, VALUE, VALUE, VALUE, VALUE, VALUE, VALUE, VALUE, VALUE, VALUE)){}
-static inline void rb_builtin_function_check_arity12(VALUE (*f)(rb_execution_context_t *ec, VALUE self, VALUE, VALUE, VALUE, VALUE, VALUE, VALUE, VALUE, VALUE, VALUE, VALUE, VALUE, VALUE)){}
-static inline void rb_builtin_function_check_arity13(VALUE (*f)(rb_execution_context_t *ec, VALUE self, VALUE, VALUE, VALUE, VALUE, VALUE, VALUE, VALUE, VALUE, VALUE, VALUE, VALUE, VALUE, VALUE)){}
-static inline void rb_builtin_function_check_arity14(VALUE (*f)(rb_execution_context_t *ec, VALUE self, VALUE, VALUE, VALUE, VALUE, VALUE, VALUE, VALUE, VALUE, VALUE, VALUE, VALUE, VALUE, VALUE, VALUE)){}
-static inline void rb_builtin_function_check_arity15(VALUE (*f)(rb_execution_context_t *ec, VALUE self, VALUE, VALUE, VALUE, VALUE, VALUE, VALUE, VALUE, VALUE, VALUE, VALUE, VALUE, VALUE, VALUE, VALUE, VALUE)){}
+typedef VALUE (*rb_builtin_arity0_function_type)(rb_execution_context_t *ec, VALUE self);
+typedef VALUE (*rb_builtin_arity1_function_type)(rb_execution_context_t *ec, VALUE self,
+        VALUE);
+typedef VALUE (*rb_builtin_arity2_function_type)(rb_execution_context_t *ec, VALUE self,
+        VALUE, VALUE);
+typedef VALUE (*rb_builtin_arity3_function_type)(rb_execution_context_t *ec, VALUE self,
+        VALUE, VALUE, VALUE);
+typedef VALUE (*rb_builtin_arity4_function_type)(rb_execution_context_t *ec, VALUE self,
+        VALUE, VALUE, VALUE, VALUE);
+typedef VALUE (*rb_builtin_arity5_function_type)(rb_execution_context_t *ec, VALUE self,
+        VALUE, VALUE, VALUE, VALUE, VALUE);
+typedef VALUE (*rb_builtin_arity6_function_type)(rb_execution_context_t *ec, VALUE self,
+        VALUE, VALUE, VALUE, VALUE, VALUE, VALUE);
+typedef VALUE (*rb_builtin_arity7_function_type)(rb_execution_context_t *ec, VALUE self,
+        VALUE, VALUE, VALUE, VALUE, VALUE, VALUE, VALUE);
+typedef VALUE (*rb_builtin_arity8_function_type)(rb_execution_context_t *ec, VALUE self,
+        VALUE, VALUE, VALUE, VALUE, VALUE, VALUE, VALUE, VALUE);
+typedef VALUE (*rb_builtin_arity9_function_type)(rb_execution_context_t *ec, VALUE self,
+        VALUE, VALUE, VALUE, VALUE, VALUE, VALUE, VALUE, VALUE, VALUE);
+typedef VALUE (*rb_builtin_arity10_function_type)(rb_execution_context_t *ec, VALUE self,
+        VALUE, VALUE, VALUE, VALUE, VALUE, VALUE, VALUE, VALUE, VALUE, VALUE);
+typedef VALUE (*rb_builtin_arity11_function_type)(rb_execution_context_t *ec, VALUE self,
+        VALUE, VALUE, VALUE, VALUE, VALUE, VALUE, VALUE, VALUE, VALUE, VALUE, VALUE);
+typedef VALUE (*rb_builtin_arity12_function_type)(rb_execution_context_t *ec, VALUE self,
+        VALUE, VALUE, VALUE, VALUE, VALUE, VALUE, VALUE, VALUE, VALUE, VALUE, VALUE, VALUE);
+typedef VALUE (*rb_builtin_arity13_function_type)(rb_execution_context_t *ec, VALUE self,
+        VALUE, VALUE, VALUE, VALUE, VALUE, VALUE, VALUE, VALUE, VALUE, VALUE, VALUE, VALUE, VALUE);
+typedef VALUE (*rb_builtin_arity14_function_type)(rb_execution_context_t *ec, VALUE self,
+        VALUE, VALUE, VALUE, VALUE, VALUE, VALUE, VALUE, VALUE, VALUE, VALUE, VALUE, VALUE, VALUE, VALUE);
+typedef VALUE (*rb_builtin_arity15_function_type)(rb_execution_context_t *ec, VALUE self,
+        VALUE, VALUE, VALUE, VALUE, VALUE, VALUE, VALUE, VALUE, VALUE, VALUE, VALUE, VALUE, VALUE, VALUE, VALUE);
+static inline void rb_builtin_function_check_arity0(rb_builtin_arity0_function_type f){}
+static inline void rb_builtin_function_check_arity1(rb_builtin_arity1_function_type f){}
+static inline void rb_builtin_function_check_arity2(rb_builtin_arity2_function_type f){}
+static inline void rb_builtin_function_check_arity3(rb_builtin_arity3_function_type f){}
+static inline void rb_builtin_function_check_arity4(rb_builtin_arity4_function_type f){}
+static inline void rb_builtin_function_check_arity5(rb_builtin_arity5_function_type f){}
+static inline void rb_builtin_function_check_arity6(rb_builtin_arity6_function_type f){}
+static inline void rb_builtin_function_check_arity7(rb_builtin_arity7_function_type f){}
+static inline void rb_builtin_function_check_arity8(rb_builtin_arity8_function_type f){}
+static inline void rb_builtin_function_check_arity9(rb_builtin_arity9_function_type f){}
+static inline void rb_builtin_function_check_arity10(rb_builtin_arity10_function_type f){}
+static inline void rb_builtin_function_check_arity11(rb_builtin_arity11_function_type f){}
+static inline void rb_builtin_function_check_arity12(rb_builtin_arity12_function_type f){}
+static inline void rb_builtin_function_check_arity13(rb_builtin_arity13_function_type f){}
+static inline void rb_builtin_function_check_arity14(rb_builtin_arity14_function_type f){}
+static inline void rb_builtin_function_check_arity15(rb_builtin_arity15_function_type f){}
 
 PUREFUNC(VALUE rb_vm_lvar_exposed(rb_execution_context_t *ec, int index));
 VALUE rb_vm_lvar_exposed(rb_execution_context_t *ec, int index);
@@ -73,6 +106,14 @@ rb_vm_lvar(rb_execution_context_t *ec, int index)
 #endif
 }
 
+static inline VALUE
+rb_builtin_basic_definition_p(rb_execution_context_t *ec, VALUE klass, VALUE id_sym)
+{
+    return rb_method_basic_definition_p(klass, rb_sym2id(id_sym)) ? Qtrue : Qfalse;
+}
+
+#define LOCAL_PTR(local) local ## __ptr
+
 // dump/load
 
 struct builtin_binary {
diff --git a/ccan/check_type/check_type.h b/ccan/check_type/check_type.h
index e795ad71d0..659e1a5a83 100644
--- a/ccan/check_type/check_type.h
+++ b/ccan/check_type/check_type.h
@@ -44,7 +44,7 @@
  *		 ((encl_type *)						\
  *		  ((char *)(mbr_ptr) - offsetof(enclosing_type, mbr))))
  */
-#if HAVE_TYPEOF
+#if defined(HAVE_TYPEOF) && HAVE_TYPEOF
 #define ccan_check_type(expr, type)			\
 	((typeof(expr) *)0 != (type *)0)
 
diff --git a/ccan/container_of/container_of.h b/ccan/container_of/container_of.h
index b30c347d57..872bb6ea6e 100644
--- a/ccan/container_of/container_of.h
+++ b/ccan/container_of/container_of.h
@@ -112,7 +112,7 @@ static inline char *container_of_or_null_(void *member_ptr, size_t offset)
  *		return i;
  *	}
  */
-#if HAVE_TYPEOF
+#if defined(HAVE_TYPEOF) && HAVE_TYPEOF
 #define ccan_container_of_var(member_ptr, container_var, member) \
 	ccan_container_of(member_ptr, typeof(*container_var), member)
 #else
@@ -131,7 +131,7 @@ static inline char *container_of_or_null_(void *member_ptr, size_t offset)
  * structure memory layout.
  *
  */
-#if HAVE_TYPEOF
+#if defined(HAVE_TYPEOF) && HAVE_TYPEOF
 #define ccan_container_off_var(var, member)		\
 	ccan_container_off(typeof(*var), member)
 #else
diff --git a/ccan/list/list.h b/ccan/list/list.h
index 91787bfdb3..bf692a6937 100644
--- a/ccan/list/list.h
+++ b/ccan/list/list.h
@@ -635,14 +635,16 @@ static inline void ccan_list_prepend_list_(struct ccan_list_head *to,
 
 /* internal macros, do not use directly */
 #define ccan_list_for_each_off_dir_(h, i, off, dir)				\
-	for (i = ccan_list_node_to_off_(ccan_list_debug(h, CCAN_LIST_LOC)->n.dir,	\
+	for (i = 0, \
+	     i = ccan_list_node_to_off_(ccan_list_debug(h, CCAN_LIST_LOC)->n.dir, \
 				   (off));				\
 	ccan_list_node_from_off_((void *)i, (off)) != &(h)->n;		\
 	i = ccan_list_node_to_off_(ccan_list_node_from_off_((void *)i, (off))->dir, \
 			      (off)))
 
 #define ccan_list_for_each_safe_off_dir_(h, i, nxt, off, dir)		\
-	for (i = ccan_list_node_to_off_(ccan_list_debug(h, CCAN_LIST_LOC)->n.dir,	\
+	for (i = 0, \
+	     i = ccan_list_node_to_off_(ccan_list_debug(h, CCAN_LIST_LOC)->n.dir, \
 				   (off)),				\
 	nxt = ccan_list_node_to_off_(ccan_list_node_from_off_(i, (off))->dir,	\
 				(off));					\
@@ -770,7 +772,7 @@ static inline struct ccan_list_node *ccan_list_node_from_off_(void *ptr, size_t
 	(ccan_container_off_var(var, member) +		\
 	 ccan_check_type(var->member, struct ccan_list_node))
 
-#if HAVE_TYPEOF
+#if defined(HAVE_TYPEOF) && HAVE_TYPEOF
 #define ccan_list_typeof(var) typeof(var)
 #else
 #define ccan_list_typeof(var) void *
diff --git a/class.c b/class.c
index e752cf87d9..9c1bd86dc3 100644
--- a/class.c
+++ b/class.c
@@ -21,6 +21,7 @@
 #include "debug_counter.h"
 #include "id_table.h"
 #include "internal.h"
+#include "internal/box.h"
 #include "internal/class.h"
 #include "internal/eval.h"
 #include "internal/hash.h"
@@ -29,130 +30,700 @@
 #include "internal/variable.h"
 #include "ruby/st.h"
 #include "vm_core.h"
+#include "ruby/ractor.h"
+#include "yjit.h"
+#include "zjit.h"
 
-#define id_attached id__attached__
+/* Flags of T_CLASS
+ *
+ * 0:    RCLASS_IS_ROOT
+ *           The class has been added to the VM roots. Will always be marked and pinned.
+ *           This is done for classes defined from C to allow storing them in global variables.
+ * 1:    RUBY_FL_SINGLETON
+ *           This class is a singleton class.
+ * 2:    RCLASS_PRIME_CLASSEXT_PRIME_WRITABLE
+ *           This class's prime classext is the only classext and writable from any boxes.
+ *           If unset, the prime classext is writable only from the root box.
+ * 3:    RCLASS_IS_INITIALIZED
+ *           Class has been initialized.
+ * 4:    RCLASS_BOXABLE
+ *           Is a builtin class that may be boxed. It larger than a normal class.
+ */
+
+/* Flags of T_ICLASS
+ *
+ * 2:    RCLASS_PRIME_CLASSEXT_PRIME_WRITABLE
+ *           This module's prime classext is the only classext and writable from any boxes.
+ *           If unset, the prime classext is writable only from the root box.
+ * 4:    RCLASS_BOXABLE
+ *           Is a builtin class that may be boxed. It larger than a normal class.
+ */
+
+/* Flags of T_MODULE
+ *
+ * 0:    RCLASS_IS_ROOT
+ *           The class has been added to the VM roots. Will always be marked and pinned.
+ *           This is done for classes defined from C to allow storing them in global variables.
+ * 1:    <reserved>
+ *          Ensures that RUBY_FL_SINGLETON is never set on a T_MODULE. See `rb_class_real`.
+ * 2:    RCLASS_PRIME_CLASSEXT_PRIME_WRITABLE
+ *           This module's prime classext is the only classext and writable from any boxes.
+ *           If unset, the prime classext is writable only from the root box.
+ * 3:    RCLASS_IS_INITIALIZED
+ *           Module has been initialized.
+ * 4:    RCLASS_BOXABLE
+ *           Is a builtin class that may be boxed. It larger than a normal class.
+ * 5:    RMODULE_IS_REFINEMENT
+ *           Module is used for refinements.
+ */
 
 #define METACLASS_OF(k) RBASIC(k)->klass
 #define SET_METACLASS_OF(k, cls) RBASIC_SET_CLASS(k, cls)
 
-RUBY_EXTERN rb_serial_t ruby_vm_global_cvar_state;
+static enum rb_id_table_iterator_result
+cvar_table_free_i(VALUE value, void *ctx)
+{
+    xfree((void *)value);
+    return ID_TABLE_CONTINUE;
+}
 
-static rb_subclass_entry_t *
-push_subclass_entry_to_list(VALUE super, VALUE klass)
+rb_classext_t *
+rb_class_unlink_classext(VALUE klass, const rb_box_t *box)
 {
-    rb_subclass_entry_t *entry, *head;
+    st_data_t ext;
+    st_data_t key = (st_data_t)box->box_object;
+    VALUE obj_id = rb_obj_id(klass);
+    st_delete(box->classext_cow_classes, &obj_id, 0);
+    st_delete(RCLASS_CLASSEXT_TBL(klass), &key, &ext);
+    return (rb_classext_t *)ext;
+}
 
-    entry = ZALLOC(rb_subclass_entry_t);
-    entry->klass = klass;
+void
+rb_class_classext_free(VALUE klass, rb_classext_t *ext, bool is_prime)
+{
+    struct rb_id_table *tbl;
 
-    head = RCLASS_SUBCLASSES(super);
-    if (!head) {
-        head = ZALLOC(rb_subclass_entry_t);
-        RCLASS_SUBCLASSES(super) = head;
+    rb_id_table_free(RCLASSEXT_M_TBL(ext));
+
+    if (!RCLASSEXT_SHARED_CONST_TBL(ext) && (tbl = RCLASSEXT_CONST_TBL(ext)) != NULL) {
+        rb_free_const_table(tbl);
     }
-    entry->next = head->next;
-    entry->prev = head;
 
-    if (head->next) {
-        head->next->prev = entry;
+    if ((tbl = RCLASSEXT_CVC_TBL(ext)) != NULL) {
+        rb_id_table_foreach_values(tbl, cvar_table_free_i, NULL);
+        rb_id_table_free(tbl);
     }
-    head->next = entry;
 
-    return entry;
+    rb_class_classext_free_subclasses(ext, klass, false);
+
+    if (RCLASSEXT_SUPERCLASSES_WITH_SELF(ext)) {
+        RUBY_ASSERT(is_prime); // superclasses should only be used on prime
+        xfree(RCLASSEXT_SUPERCLASSES(ext));
+    }
+
+    if (!is_prime) { // the prime classext will be freed with RClass
+        xfree(ext);
+    }
 }
 
 void
-rb_class_subclass_add(VALUE super, VALUE klass)
+rb_iclass_classext_free(VALUE klass, rb_classext_t *ext, bool is_prime)
 {
-    if (super && super != Qundef) {
-        rb_subclass_entry_t *entry = push_subclass_entry_to_list(super, klass);
-        RCLASS_SUBCLASS_ENTRY(klass) = entry;
+    if (RCLASSEXT_ICLASS_IS_ORIGIN(ext) && !RCLASSEXT_ICLASS_ORIGIN_SHARED_MTBL(ext)) {
+        /* Method table is not shared for origin iclasses of classes */
+        rb_id_table_free(RCLASSEXT_M_TBL(ext));
+    }
+
+    if (RCLASSEXT_CALLABLE_M_TBL(ext) != NULL) {
+        rb_id_table_free(RCLASSEXT_CALLABLE_M_TBL(ext));
+    }
+
+    rb_class_classext_free_subclasses(ext, klass, false);
+
+    if (!is_prime) { // the prime classext will be freed with RClass
+        xfree(ext);
     }
 }
 
 static void
-rb_module_add_to_subclasses_list(VALUE module, VALUE iclass)
+iclass_free_orphan_classext(VALUE klass, rb_classext_t *ext)
 {
-    rb_subclass_entry_t *entry = push_subclass_entry_to_list(module, iclass);
-    RCLASS_MODULE_SUBCLASS_ENTRY(iclass) = entry;
+    if (RCLASSEXT_ICLASS_IS_ORIGIN(ext) && !RCLASSEXT_ICLASS_ORIGIN_SHARED_MTBL(ext)) {
+        /* Method table is not shared for origin iclasses of classes */
+        rb_id_table_free(RCLASSEXT_M_TBL(ext));
+    }
+
+    if (RCLASSEXT_CALLABLE_M_TBL(ext) != NULL) {
+        rb_id_table_free(RCLASSEXT_CALLABLE_M_TBL(ext));
+    }
+
+    rb_class_classext_free_subclasses(ext, klass, true); // replacing this classext with a newer one
+
+    xfree(ext);
 }
 
-void
-rb_class_remove_subclass_head(VALUE klass)
+struct rb_class_set_box_classext_args {
+    VALUE obj;
+    rb_classext_t *ext;
+};
+
+static int
+set_box_classext_update(st_data_t *key_ptr, st_data_t *val_ptr, st_data_t a, int existing)
 {
-    rb_subclass_entry_t *head = RCLASS_SUBCLASSES(klass);
+    struct rb_class_set_box_classext_args *args = (struct rb_class_set_box_classext_args *)a;
 
-    if (head) {
-        if (head->next) {
-            head->next->prev = NULL;
+    if (existing) {
+        if (LIKELY(BUILTIN_TYPE(args->obj) == T_ICLASS)) {
+            iclass_free_orphan_classext(args->obj, (rb_classext_t *)*val_ptr);
+        }
+        else {
+            rb_bug("Updating existing classext for non-iclass never happen");
         }
-        RCLASS_SUBCLASSES(klass) = NULL;
-        xfree(head);
     }
+
+    *val_ptr = (st_data_t)args->ext;
+
+    return ST_CONTINUE;
 }
 
 void
-rb_class_remove_from_super_subclasses(VALUE klass)
+rb_class_set_box_classext(VALUE obj, const rb_box_t *box, rb_classext_t *ext)
 {
-    rb_subclass_entry_t *entry = RCLASS_SUBCLASS_ENTRY(klass);
+    struct rb_class_set_box_classext_args args = {
+        .obj = obj,
+        .ext = ext,
+    };
 
-    if (entry) {
-        rb_subclass_entry_t *prev = entry->prev, *next = entry->next;
+    VM_ASSERT(BOX_USER_P(box));
 
-        if (prev) {
-            prev->next = next;
-        }
-        if (next) {
-            next->prev = prev;
+    st_update(RCLASS_CLASSEXT_TBL(obj), (st_data_t)box->box_object, set_box_classext_update, (st_data_t)&args);
+    st_insert(box->classext_cow_classes, (st_data_t)rb_obj_id(obj), obj);
+
+    // FIXME: This is done here because this is the first time the objects in
+    // the classext are exposed via this class. It's likely that if GC
+    // compaction occurred between the VALUEs being copied in and this
+    // writebarrier trigger the values will be stale.
+    rb_gc_writebarrier_remember(obj);
+}
+
+RUBY_EXTERN rb_serial_t ruby_vm_global_cvar_state;
+
+struct duplicate_id_tbl_data {
+    struct rb_id_table *tbl;
+    VALUE klass;
+};
+
+static enum rb_id_table_iterator_result
+duplicate_classext_id_table_i(ID key, VALUE value, void *data)
+{
+    struct rb_id_table *tbl = (struct rb_id_table *)data;
+    rb_id_table_insert(tbl, key, value);
+    return ID_TABLE_CONTINUE;
+}
+
+static enum rb_id_table_iterator_result
+duplicate_classext_m_tbl_i(ID key, VALUE value, void *data)
+{
+    struct duplicate_id_tbl_data *arg = (struct duplicate_id_tbl_data *)data;
+    rb_method_entry_t *me = (rb_method_entry_t *)value;
+    rb_method_table_insert0(arg->klass, arg->tbl, key, me, false);
+    return ID_TABLE_CONTINUE;
+}
+
+static struct rb_id_table *
+duplicate_classext_m_tbl(struct rb_id_table *orig, VALUE klass, bool init_missing)
+{
+    struct rb_id_table *tbl;
+    if (!orig) {
+        if (init_missing)
+            return rb_id_table_create(0);
+        else
+            return NULL;
+    }
+    tbl = rb_id_table_create(rb_id_table_size(orig));
+    struct duplicate_id_tbl_data data = {
+        .tbl = tbl,
+        .klass = klass,
+    };
+    rb_id_table_foreach(orig, duplicate_classext_m_tbl_i, &data);
+    return tbl;
+}
+
+static struct rb_id_table *
+duplicate_classext_id_table(struct rb_id_table *orig, bool init_missing)
+{
+    struct rb_id_table *tbl;
+
+    if (!orig) {
+        if (init_missing)
+            return rb_id_table_create(0);
+        else
+            return NULL;
+    }
+    tbl = rb_id_table_create(rb_id_table_size(orig));
+    rb_id_table_foreach(orig, duplicate_classext_id_table_i, tbl);
+    return tbl;
+}
+
+static rb_const_entry_t *
+duplicate_classext_const_entry(rb_const_entry_t *src, VALUE klass)
+{
+    // See also: setup_const_entry (variable.c)
+    rb_const_entry_t *dst = ZALLOC(rb_const_entry_t);
+
+    dst->flag = src->flag;
+    dst->line = src->line;
+    RB_OBJ_WRITE(klass, &dst->value, src->value);
+    RB_OBJ_WRITE(klass, &dst->file, src->file);
+
+    return dst;
+}
+
+static enum rb_id_table_iterator_result
+duplicate_classext_const_tbl_i(ID key, VALUE value, void *data)
+{
+    struct duplicate_id_tbl_data *arg = (struct duplicate_id_tbl_data *)data;
+    rb_const_entry_t *entry = duplicate_classext_const_entry((rb_const_entry_t *)value, arg->klass);
+
+    rb_id_table_insert(arg->tbl, key, (VALUE)entry);
+
+    return ID_TABLE_CONTINUE;
+}
+
+static struct rb_id_table *
+duplicate_classext_const_tbl(struct rb_id_table *src, VALUE klass)
+{
+    struct rb_id_table *dst;
+
+    if (!src)
+        return NULL;
+
+    dst = rb_id_table_create(rb_id_table_size(src));
+
+    struct duplicate_id_tbl_data data = {
+        .tbl = dst,
+        .klass = klass,
+    };
+    rb_id_table_foreach(src, duplicate_classext_const_tbl_i, (void *)&data);
+
+    return dst;
+}
+
+static VALUE
+box_subclasses_tbl_key(const rb_box_t *box)
+{
+    if (!box){
+        return 0;
+    }
+    return (VALUE)box->box_id;
+}
+
+static void
+duplicate_classext_subclasses(rb_classext_t *orig, rb_classext_t *copy)
+{
+    rb_subclass_anchor_t *anchor, *orig_anchor;
+    rb_subclass_entry_t *head, *cur, *cdr, *entry, *first = NULL;
+    rb_box_subclasses_t *box_subclasses;
+    struct st_table *tbl;
+
+    if (RCLASSEXT_SUBCLASSES(orig)) {
+        orig_anchor = RCLASSEXT_SUBCLASSES(orig);
+        box_subclasses = orig_anchor->box_subclasses;
+        tbl = ((rb_box_subclasses_t *)box_subclasses)->tbl;
+
+        anchor = ZALLOC(rb_subclass_anchor_t);
+        anchor->box_subclasses = rb_box_subclasses_ref_inc(box_subclasses);
+
+        head = ZALLOC(rb_subclass_entry_t);
+        anchor->head = head;
+
+        RCLASSEXT_SUBCLASSES(copy) = anchor;
+
+        cur = head;
+        entry = orig_anchor->head;
+        RUBY_ASSERT(!entry->klass);
+        // The head entry has NULL klass always. See rb_class_foreach_subclass().
+        entry = entry->next;
+        while (entry) {
+            if (rb_objspace_garbage_object_p(entry->klass)) {
+                entry = entry->next;
+                continue;
+            }
+            cdr = ZALLOC(rb_subclass_entry_t);
+            cdr->klass = entry->klass;
+            cdr->prev = cur;
+            cur->next = cdr;
+            if (!first) {
+                VALUE box_id = box_subclasses_tbl_key(RCLASSEXT_BOX(copy));
+                first = cdr;
+                st_insert(tbl, box_id, (st_data_t)first);
+            }
+            cur = cdr;
+            entry = entry->next;
         }
+    }
+
+    if (RCLASSEXT_BOX_SUPER_SUBCLASSES(orig))
+        RCLASSEXT_BOX_SUPER_SUBCLASSES(copy) = rb_box_subclasses_ref_inc(RCLASSEXT_BOX_SUPER_SUBCLASSES(orig));
+    if (RCLASSEXT_BOX_MODULE_SUBCLASSES(orig))
+        RCLASSEXT_BOX_MODULE_SUBCLASSES(copy) = rb_box_subclasses_ref_inc(RCLASSEXT_BOX_MODULE_SUBCLASSES(orig));
+}
+
+static void
+class_duplicate_iclass_classext(VALUE iclass, rb_classext_t *mod_ext, const rb_box_t *box)
+{
+    RUBY_ASSERT(RB_TYPE_P(iclass, T_ICLASS));
+
+    rb_classext_t *src = RCLASS_EXT_PRIME(iclass);
+    rb_classext_t *ext = RCLASS_EXT_TABLE_LOOKUP_INTERNAL(iclass, box);
+    int first_set = 0;
+
+    if (ext) {
+        // iclass classext for the ns is only for cc/callable_m_tbl if it's created earlier than module's one
+        rb_invalidate_method_caches(RCLASSEXT_CALLABLE_M_TBL(ext), RCLASSEXT_CC_TBL(ext));
+    }
 
-	xfree(entry);
+    ext = ZALLOC(rb_classext_t);
+
+    RCLASSEXT_BOX(ext) = box;
+
+    RCLASSEXT_SUPER(ext) = RCLASSEXT_SUPER(src);
+
+    // See also: rb_include_class_new()
+    if (RCLASSEXT_ICLASS_IS_ORIGIN(src) && !RCLASSEXT_ICLASS_ORIGIN_SHARED_MTBL(src)) {
+        RCLASSEXT_M_TBL(ext) = duplicate_classext_m_tbl(RCLASSEXT_M_TBL(src), iclass, true);
     }
+    else {
+        RCLASSEXT_M_TBL(ext) = RCLASSEXT_M_TBL(mod_ext);
+    }
+
+    RCLASSEXT_CONST_TBL(ext) = RCLASSEXT_CONST_TBL(mod_ext);
+    RCLASSEXT_CVC_TBL(ext) = RCLASSEXT_CVC_TBL(mod_ext);
+
+    // Those are cache and should be recreated when methods are called
+    // RCLASSEXT_CALLABLE_M_TBL(ext) = NULL;
+    // RCLASSEXT_CC_TBL(ext) = NULL;
+
+    // subclasses, box_super_subclasses_tbl, box_module_subclasses_tbl
+    duplicate_classext_subclasses(src, ext);
+
+    RCLASSEXT_SET_ORIGIN(ext, iclass, RCLASSEXT_ORIGIN(src));
+    RCLASSEXT_ICLASS_IS_ORIGIN(ext) = RCLASSEXT_ICLASS_IS_ORIGIN(src);
+    RCLASSEXT_ICLASS_ORIGIN_SHARED_MTBL(ext) = RCLASSEXT_ICLASS_ORIGIN_SHARED_MTBL(src);
+
+    RCLASSEXT_SET_INCLUDER(ext, iclass, RCLASSEXT_INCLUDER(src));
+
+    VM_ASSERT(FL_TEST_RAW(iclass, RCLASS_BOXABLE));
 
-    RCLASS_SUBCLASS_ENTRY(klass) = NULL;
+    first_set = RCLASS_SET_BOX_CLASSEXT(iclass, box, ext);
+    if (first_set) {
+        RCLASS_SET_PRIME_CLASSEXT_WRITABLE(iclass, false);
+    }
+}
+
+rb_classext_t *
+rb_class_duplicate_classext(rb_classext_t *orig, VALUE klass, const rb_box_t *box)
+{
+    VM_ASSERT(RB_TYPE_P(klass, T_CLASS) || RB_TYPE_P(klass, T_MODULE) || RB_TYPE_P(klass, T_ICLASS));
+
+    rb_classext_t *ext = ZALLOC(rb_classext_t);
+    bool dup_iclass = RB_TYPE_P(klass, T_MODULE) ? true : false;
+
+    RCLASSEXT_BOX(ext) = box;
+
+    RCLASSEXT_SUPER(ext) = RCLASSEXT_SUPER(orig);
+
+    RCLASSEXT_M_TBL(ext) = duplicate_classext_m_tbl(RCLASSEXT_M_TBL(orig), klass, dup_iclass);
+    RCLASSEXT_ICLASS_IS_ORIGIN(ext) = true;
+    RCLASSEXT_ICLASS_ORIGIN_SHARED_MTBL(ext) = false;
+
+    if (orig->fields_obj) {
+        RB_OBJ_WRITE(klass, &ext->fields_obj, rb_imemo_fields_clone(orig->fields_obj));
+    }
+
+    if (RCLASSEXT_SHARED_CONST_TBL(orig)) {
+        RCLASSEXT_CONST_TBL(ext) = RCLASSEXT_CONST_TBL(orig);
+        RCLASSEXT_SHARED_CONST_TBL(ext) = true;
+    }
+    else {
+        RCLASSEXT_CONST_TBL(ext) = duplicate_classext_const_tbl(RCLASSEXT_CONST_TBL(orig), klass);
+        RCLASSEXT_SHARED_CONST_TBL(ext) = false;
+    }
+    /*
+     * callable_m_tbl is for `super` chain, and entries will be created when the super chain is called.
+     * so initially, it can be NULL and let it be created lazily.
+     * RCLASSEXT_CALLABLE_M_TBL(ext) = NULL;
+     *
+     * cc_tbl is for method inline cache, and method calls from different boxes never occur on
+     * the same code, so the copied classext should have a different cc_tbl from the prime one.
+     * RCLASSEXT_CC_TBL(copy) = NULL
+     */
+
+    RCLASSEXT_CVC_TBL(ext) = duplicate_classext_id_table(RCLASSEXT_CVC_TBL(orig), dup_iclass);
+
+    // subclasses, subclasses_index
+    duplicate_classext_subclasses(orig, ext);
+
+    RCLASSEXT_SET_ORIGIN(ext, klass, RCLASSEXT_ORIGIN(orig));
+    /*
+     * Members not copied to box's classext values
+     * * refined_class
+     * * as.class.allocator / as.singleton_class.attached_object
+     * * includer
+     * * max IV count
+     * * variation count
+     */
+    RCLASSEXT_PERMANENT_CLASSPATH(ext) = RCLASSEXT_PERMANENT_CLASSPATH(orig);
+    RCLASSEXT_CLONED(ext) = RCLASSEXT_CLONED(orig);
+    RCLASSEXT_CLASSPATH(ext) = RCLASSEXT_CLASSPATH(orig);
+
+    /* For the usual T_CLASS/T_MODULE, iclass flags are always false */
+
+    if (dup_iclass) {
+        VALUE iclass;
+        /*
+         * ICLASS has the same m_tbl/const_tbl/cvc_tbl with the included module.
+         * So the module's classext is copied, its tables should be also referred
+         * by the ICLASS's classext for the box.
+         */
+        rb_subclass_anchor_t *anchor = RCLASSEXT_SUBCLASSES(ext);
+        rb_subclass_entry_t *subclass_entry = anchor->head;
+        while (subclass_entry) {
+            if (subclass_entry->klass && RB_TYPE_P(subclass_entry->klass, T_ICLASS)) {
+                iclass = subclass_entry->klass;
+                VM_ASSERT(RB_TYPE_P(iclass, T_ICLASS));
+                if (RBASIC_CLASS(iclass) == klass) {
+                    // Is the subclass an ICLASS including this module into another class
+                    // If so we need to re-associate it under our box with the new ext
+                    VM_ASSERT(FL_TEST_RAW(iclass, RCLASS_BOXABLE));
+                    class_duplicate_iclass_classext(iclass, ext, box);
+                }
+            }
+            subclass_entry = subclass_entry->next;
+        }
+    }
+
+    return ext;
 }
 
 void
-rb_class_remove_from_module_subclasses(VALUE klass)
+rb_class_ensure_writable(VALUE klass)
+{
+    VM_ASSERT(RB_TYPE_P(klass, T_CLASS) || RB_TYPE_P(klass, T_MODULE) || RB_TYPE_P(klass, T_ICLASS));
+    RCLASS_EXT_WRITABLE(klass);
+}
+
+struct class_classext_foreach_arg {
+    rb_class_classext_foreach_callback_func *func;
+    void * callback_arg;
+};
+
+static int
+class_classext_foreach_i(st_data_t key, st_data_t value, st_data_t arg)
+{
+    struct class_classext_foreach_arg *foreach_arg = (struct class_classext_foreach_arg *)arg;
+    rb_class_classext_foreach_callback_func *func = foreach_arg->func;
+    func((rb_classext_t *)value, false, (VALUE)key, foreach_arg->callback_arg);
+    return ST_CONTINUE;
+}
+
+void
+rb_class_classext_foreach(VALUE klass, rb_class_classext_foreach_callback_func *func, void *arg)
+{
+    st_table *tbl = RCLASS_CLASSEXT_TBL(klass);
+    struct class_classext_foreach_arg foreach_arg;
+    if (tbl) {
+        foreach_arg.func = func;
+        foreach_arg.callback_arg = arg;
+        rb_st_foreach(tbl, class_classext_foreach_i, (st_data_t)&foreach_arg);
+    }
+    func(RCLASS_EXT_PRIME(klass), true, (VALUE)NULL, arg);
+}
+
+VALUE
+rb_class_super_of(VALUE klass)
+{
+    return RCLASS_SUPER(klass);
+}
+
+VALUE
+rb_class_singleton_p(VALUE klass)
+{
+    return RCLASS_SINGLETON_P(klass);
+}
+
+unsigned char
+rb_class_variation_count(VALUE klass)
 {
-    rb_subclass_entry_t *entry = RCLASS_MODULE_SUBCLASS_ENTRY(klass);
+    return RCLASS_VARIATION_COUNT(klass);
+}
 
-    if (entry) {
-        rb_subclass_entry_t *prev = entry->prev, *next = entry->next;
+static void
+push_subclass_entry_to_list(VALUE super, VALUE klass, bool is_module)
+{
+    rb_subclass_entry_t *entry, *head;
+    rb_subclass_anchor_t *anchor;
+    rb_box_subclasses_t *box_subclasses;
+    struct st_table *tbl;
+    const rb_box_t *box = rb_current_box();
 
-        if (prev) {
-            prev->next = next;
+    entry = ZALLOC(rb_subclass_entry_t);
+    entry->klass = klass;
+
+    RB_VM_LOCKING() {
+        anchor = RCLASS_WRITABLE_SUBCLASSES(super);
+        VM_ASSERT(anchor);
+        box_subclasses = (rb_box_subclasses_t *)anchor->box_subclasses;
+        VM_ASSERT(box_subclasses);
+        tbl = box_subclasses->tbl;
+        VM_ASSERT(tbl);
+
+        head = anchor->head;
+        if (head->next) {
+            head->next->prev = entry;
+            entry->next = head->next;
         }
-	if (next) {
-            next->prev = prev;
-	}
+        head->next = entry;
+        entry->prev = head;
+        st_insert(tbl, box_subclasses_tbl_key(box), (st_data_t)entry);
+    }
+
+    if (is_module) {
+        RCLASS_WRITE_BOX_MODULE_SUBCLASSES(klass, anchor->box_subclasses);
+    }
+    else {
+        RCLASS_WRITE_BOX_SUPER_SUBCLASSES(klass, anchor->box_subclasses);
+    }
+}
 
-	xfree(entry);
+void
+rb_class_subclass_add(VALUE super, VALUE klass)
+{
+    if (super && !UNDEF_P(super)) {
+        push_subclass_entry_to_list(super, klass, false);
     }
+}
 
-    RCLASS_MODULE_SUBCLASS_ENTRY(klass) = NULL;
+static void
+rb_module_add_to_subclasses_list(VALUE module, VALUE iclass)
+{
+    if (module && !UNDEF_P(module)) {
+        push_subclass_entry_to_list(module, iclass, true);
+    }
+}
+
+static struct rb_subclass_entry *
+class_get_subclasses_for_ns(struct st_table *tbl, VALUE box_id)
+{
+    st_data_t value;
+    if (st_lookup(tbl, (st_data_t)box_id, &value)) {
+        return (struct rb_subclass_entry *)value;
+    }
+    return NULL;
+}
+
+static int
+remove_class_from_subclasses_replace_first_entry(st_data_t *key, st_data_t *value, st_data_t arg, int existing)
+{
+    *value = arg;
+    return ST_CONTINUE;
+}
+
+static void
+remove_class_from_subclasses(struct st_table *tbl, VALUE box_id, VALUE klass)
+{
+    rb_subclass_entry_t *entry = class_get_subclasses_for_ns(tbl, box_id);
+    bool first_entry = true;
+    while (entry) {
+        if (entry->klass == klass) {
+            rb_subclass_entry_t *prev = entry->prev, *next = entry->next;
+
+            if (prev) {
+                prev->next = next;
+            }
+            if (next) {
+                next->prev = prev;
+            }
+
+            if (first_entry) {
+                if (next) {
+                    st_update(tbl, box_id, remove_class_from_subclasses_replace_first_entry, (st_data_t)next);
+                }
+                else {
+                    // no subclass entries in this ns after the deletion
+                    st_delete(tbl, &box_id, NULL);
+                }
+            }
+
+            xfree(entry);
+
+            break;
+        }
+        else if (first_entry) {
+            first_entry = false;
+        }
+        entry = entry->next;
+    }
 }
 
 void
-rb_class_foreach_subclass(VALUE klass, void (*f)(VALUE, VALUE), VALUE arg)
+rb_class_remove_from_super_subclasses(VALUE klass)
 {
-    // RCLASS_SUBCLASSES should always point to our head element which has NULL klass
-    rb_subclass_entry_t *cur = RCLASS_SUBCLASSES(klass);
-    // if we have a subclasses list, then the head is a placeholder with no valid
-    // class. So ignore it and use the next element in the list (if one exists)
-    if (cur) {
-        RUBY_ASSERT(!cur->klass);
-        cur = cur->next;
+    rb_classext_t *ext = RCLASS_EXT_WRITABLE(klass);
+    rb_box_subclasses_t *box_subclasses = RCLASSEXT_BOX_SUPER_SUBCLASSES(ext);
+
+    if (!box_subclasses) return;
+    remove_class_from_subclasses(box_subclasses->tbl, box_subclasses_tbl_key(RCLASSEXT_BOX(ext)), klass);
+    rb_box_subclasses_ref_dec(box_subclasses);
+    RCLASSEXT_BOX_SUPER_SUBCLASSES(ext) = 0;
+}
+
+void
+rb_class_classext_free_subclasses(rb_classext_t *ext, VALUE klass, bool replacing)
+{
+    rb_subclass_anchor_t *anchor = RCLASSEXT_SUBCLASSES(ext);
+    struct st_table *tbl = anchor->box_subclasses->tbl;
+    VALUE box_id = box_subclasses_tbl_key(RCLASSEXT_BOX(ext));
+    rb_subclass_entry_t *next, *entry = anchor->head;
+
+    while (entry) {
+        next = entry->next;
+        xfree(entry);
+        entry = next;
+    }
+    VM_ASSERT(
+        rb_box_subclasses_ref_count(anchor->box_subclasses) > 0,
+        "box_subclasses refcount (%p) %ld", anchor->box_subclasses, rb_box_subclasses_ref_count(anchor->box_subclasses));
+    st_delete(tbl, &box_id, NULL);
+    rb_box_subclasses_ref_dec(anchor->box_subclasses);
+    xfree(anchor);
+
+    if (RCLASSEXT_BOX_SUPER_SUBCLASSES(ext)) {
+        rb_box_subclasses_t *box_sub = RCLASSEXT_BOX_SUPER_SUBCLASSES(ext);
+        if (!replacing) remove_class_from_subclasses(box_sub->tbl, box_id, klass);
+        rb_box_subclasses_ref_dec(box_sub);
+    }
+    if (RCLASSEXT_BOX_MODULE_SUBCLASSES(ext)) {
+        rb_box_subclasses_t *box_sub = RCLASSEXT_BOX_MODULE_SUBCLASSES(ext);
+        if (!replacing) remove_class_from_subclasses(box_sub->tbl, box_id, klass);
+        rb_box_subclasses_ref_dec(box_sub);
     }
+}
 
+void
+rb_class_foreach_subclass(VALUE klass, void (*f)(VALUE, VALUE), VALUE arg)
+{
+    rb_subclass_entry_t *tmp;
+    rb_subclass_entry_t *cur = RCLASS_SUBCLASSES_FIRST(klass);
     /* do not be tempted to simplify this loop into a for loop, the order of
        operations is important here if `f` modifies the linked list */
     while (cur) {
-	VALUE curklass = cur->klass;
-	cur = cur->next;
+        VALUE curklass = cur->klass;
+        tmp = cur->next;
         // do not trigger GC during f, otherwise the cur will become
         // a dangling pointer if the subclass is collected
-	f(curklass, arg);
+        f(curklass, arg);
+        cur = tmp;
     }
 }
 
@@ -162,107 +733,168 @@ class_detach_subclasses(VALUE klass, VALUE arg)
     rb_class_remove_from_super_subclasses(klass);
 }
 
-void
-rb_class_detach_subclasses(VALUE klass)
-{
-    rb_class_foreach_subclass(klass, class_detach_subclasses, Qnil);
-}
-
 static void
-class_detach_module_subclasses(VALUE klass, VALUE arg)
+class_switch_superclass(VALUE super, VALUE klass)
 {
-    rb_class_remove_from_module_subclasses(klass);
-}
-
-void
-rb_class_detach_module_subclasses(VALUE klass)
-{
-    rb_class_foreach_subclass(klass, class_detach_module_subclasses, Qnil);
+    RB_VM_LOCKING() {
+        class_detach_subclasses(klass, Qnil);
+        rb_class_subclass_add(super, klass);
+    }
 }
 
 /**
- * Allocates a struct RClass for a new class.
+ * Allocates a struct RClass for a new class, iclass, or module.
  *
- * \param flags     initial value for basic.flags of the returned class.
- * \param klass     the class of the returned class.
- * \return          an uninitialized Class object.
- * \pre  \p klass must refer \c Class class or an ancestor of Class.
- * \pre  \code (flags | T_CLASS) != 0  \endcode
- * \post the returned class can safely be \c #initialize 'd.
+ * @param type      The type of the RClass (T_CLASS, T_ICLASS, or T_MODULE)
+ * @param klass     value for basic.klass of the returned object.
+ * @return          an uninitialized Class/IClass/Module object.
+ * @pre  `klass` must refer to a class or module
  *
- * \note this function is not Class#allocate.
+ * @note this function is not Class#allocate.
  */
 static VALUE
-class_alloc(VALUE flags, VALUE klass)
+class_alloc0(enum ruby_value_type type, VALUE klass, bool boxable)
 {
-    size_t alloc_size = sizeof(struct RClass);
+    rb_box_subclasses_t *box_subclasses;
+    rb_subclass_anchor_t *anchor;
+    const rb_box_t *box = rb_current_box();
 
-#if USE_RVARGC
-    alloc_size += sizeof(rb_classext_t);
-#endif
+    if (!ruby_box_init_done) {
+        boxable = true;
+    }
+
+    size_t alloc_size = sizeof(struct RClass_and_rb_classext_t);
+    if (boxable) {
+        alloc_size = sizeof(struct RClass_boxable);
+    }
 
-    flags &= T_MASK;
-    flags |= FL_PROMOTED1 /* start from age == 2 */;
+    // class_alloc is supposed to return a new object that is not promoted yet.
+    // So, we need to avoid GC after NEWOBJ_OF.
+    // To achieve that, we allocate subclass lists before NEWOBJ_OF.
+    //
+    // TODO: Note that this could cause memory leak.
+    // If NEWOBJ_OF fails with out of memory, these buffers will leak.
+    box_subclasses = ZALLOC(rb_box_subclasses_t);
+    box_subclasses->refcount = 1;
+    box_subclasses->tbl = st_init_numtable();
+    anchor = ZALLOC(rb_subclass_anchor_t);
+    anchor->box_subclasses = box_subclasses;
+    anchor->head = ZALLOC(rb_subclass_entry_t);
+
+    RUBY_ASSERT(type == T_CLASS || type == T_ICLASS || type == T_MODULE);
+
+    VALUE flags = type | FL_SHAREABLE;
     if (RGENGC_WB_PROTECTED_CLASS) flags |= FL_WB_PROTECTED;
-    RVARGC_NEWOBJ_OF(obj, struct RClass, klass, flags, alloc_size);
+    if (boxable) flags |= RCLASS_BOXABLE;
 
-#if USE_RVARGC
-    memset(RCLASS_EXT(obj), 0, sizeof(rb_classext_t));
-# if SIZEOF_SERIAL_T != SIZEOF_VALUE
-    RCLASS(obj)->class_serial_ptr = ZALLOC(rb_serial_t);
-# endif
-#else
-    obj->ptr = ZALLOC(rb_classext_t);
-#endif
+    NEWOBJ_OF(obj, struct RClass, klass, flags, alloc_size, 0);
+
+    obj->object_id = 0;
+
+    memset(RCLASS_EXT_PRIME(obj), 0, sizeof(rb_classext_t));
 
     /* ZALLOC
-      RCLASS_IV_TBL(obj) = 0;
       RCLASS_CONST_TBL(obj) = 0;
       RCLASS_M_TBL(obj) = 0;
-      RCLASS_IV_INDEX_TBL(obj) = 0;
+      RCLASS_FIELDS(obj) = 0;
       RCLASS_SET_SUPER((VALUE)obj, 0);
-      RCLASS_SUBCLASSES(obj) = NULL;
-      RCLASS_PARENT_SUBCLASSES(obj) = NULL;
-      RCLASS_MODULE_SUBCLASSES(obj) = NULL;
      */
+
+    if (boxable) {
+        ((struct RClass_boxable *)obj)->box_classext_tbl = NULL;
+    }
+
+    RCLASS_PRIME_BOX((VALUE)obj) = box;
+    // Classes/Modules defined in user boxes are
+    // writable directly because it exists only in a box.
+    RCLASS_SET_PRIME_CLASSEXT_WRITABLE((VALUE)obj, !boxable || BOX_USER_P(box));
+
     RCLASS_SET_ORIGIN((VALUE)obj, (VALUE)obj);
-    RCLASS_SERIAL(obj) = rb_next_class_serial();
-    RB_OBJ_WRITE(obj, &RCLASS_REFINED_CLASS(obj), Qnil);
-    RCLASS_ALLOCATOR(obj) = 0;
+    RCLASS_SET_REFINED_CLASS((VALUE)obj, Qnil);
+
+    RCLASS_SET_SUBCLASSES((VALUE)obj, anchor);
 
     return (VALUE)obj;
 }
 
+static VALUE
+class_alloc(enum ruby_value_type type, VALUE klass)
+{
+    bool boxable = rb_box_available() && BOX_ROOT_P(rb_current_box());
+    return class_alloc0(type, klass, boxable);
+}
+
+static VALUE
+class_associate_super(VALUE klass, VALUE super, bool init)
+{
+    if (super && !UNDEF_P(super)) {
+        class_switch_superclass(super, klass);
+    }
+    if (init) {
+        RCLASS_SET_SUPER(klass, super);
+    }
+    else {
+        RCLASS_WRITE_SUPER(klass, super);
+    }
+    rb_class_update_superclasses(klass);
+    return super;
+}
+
+VALUE
+rb_class_set_super(VALUE klass, VALUE super)
+{
+    return class_associate_super(klass, super, false);
+}
+
 static void
-RCLASS_M_TBL_INIT(VALUE c)
+class_initialize_method_table(VALUE c)
 {
-    RCLASS_M_TBL(c) = rb_id_table_create(0);
+    // initialize the prime classext m_tbl
+    RCLASS_SET_M_TBL(c, rb_id_table_create(0));
 }
 
-/*!
+static void
+class_clear_method_table(VALUE c)
+{
+    RCLASS_WRITE_M_TBL(c, rb_id_table_create(0));
+}
+
+static VALUE
+class_boot_boxable(VALUE super, bool boxable)
+{
+    VALUE klass = class_alloc0(T_CLASS, rb_cClass, boxable);
+
+    // initialize method table prior to class_associate_super()
+    // because class_associate_super() may cause GC and promote klass
+    class_initialize_method_table(klass);
+
+    class_associate_super(klass, super, true);
+    if (super && !UNDEF_P(super)) {
+        rb_class_set_initialized(klass);
+    }
+
+    return (VALUE)klass;
+}
+
+/**
  * A utility function that wraps class_alloc.
  *
  * allocates a class and initializes safely.
- * \param super     a class from which the new class derives.
- * \return          a class object.
- * \pre  \a super must be a class.
- * \post the metaclass of the new class is Class.
+ * @param super     a class from which the new class derives.
+ * @return          a class object.
+ * @pre  `super` must be a class.
+ * @post the metaclass of the new class is Class.
  */
 VALUE
 rb_class_boot(VALUE super)
 {
-    VALUE klass = class_alloc(T_CLASS, rb_cClass);
-
-    RCLASS_SET_SUPER(klass, super);
-    RCLASS_M_TBL_INIT(klass);
-
-    return (VALUE)klass;
+    return class_boot_boxable(super, false);
 }
 
 static VALUE *
 class_superclasses_including_self(VALUE klass)
 {
-    if (FL_TEST_RAW(klass, RCLASS_SUPERCLASSES_INCLUDE_SELF))
+    if (RCLASS_SUPERCLASSES_WITH_SELF_P(klass))
         return RCLASS_SUPERCLASSES(klass);
 
     size_t depth = RCLASS_SUPERCLASS_DEPTH(klass);
@@ -271,18 +903,18 @@ class_superclasses_including_self(VALUE klass)
         memcpy(superclasses, RCLASS_SUPERCLASSES(klass), sizeof(VALUE) * depth);
     superclasses[depth] = klass;
 
-    RCLASS_SUPERCLASSES(klass) = superclasses;
-    FL_SET_RAW(klass, RCLASS_SUPERCLASSES_INCLUDE_SELF);
     return superclasses;
 }
 
 void
 rb_class_update_superclasses(VALUE klass)
 {
+    VALUE *superclasses;
+    size_t super_depth;
     VALUE super = RCLASS_SUPER(klass);
 
     if (!RB_TYPE_P(klass, T_CLASS)) return;
-    if (super == Qundef) return;
+    if (UNDEF_P(super)) return;
 
     // If the superclass array is already built
     if (RCLASS_SUPERCLASSES(klass))
@@ -307,8 +939,17 @@ rb_class_update_superclasses(VALUE klass)
             return;
     }
 
-    RCLASS_SUPERCLASSES(klass) = class_superclasses_including_self(super);
-    RCLASS_SUPERCLASS_DEPTH(klass) = RCLASS_SUPERCLASS_DEPTH(super) + 1;
+    super_depth = RCLASS_SUPERCLASS_DEPTH(super);
+    if (RCLASS_SUPERCLASSES_WITH_SELF_P(super)) {
+        superclasses = RCLASS_SUPERCLASSES(super);
+    }
+    else {
+        superclasses = class_superclasses_including_self(super);
+        RCLASS_WRITE_SUPERCLASSES(super, super_depth, superclasses, true);
+    }
+
+    size_t depth = super_depth == RCLASS_MAX_SUPERCLASS_DEPTH ? super_depth : super_depth + 1;
+    RCLASS_WRITE_SUPERCLASSES(klass, depth, superclasses, false);
 }
 
 void
@@ -316,13 +957,13 @@ rb_check_inheritable(VALUE super)
 {
     if (!RB_TYPE_P(super, T_CLASS)) {
         rb_raise(rb_eTypeError, "superclass must be an instance of Class (given an instance of %"PRIsVALUE")",
-		 rb_obj_class(super));
+                 rb_obj_class(super));
     }
-    if (RBASIC(super)->flags & FL_SINGLETON) {
-	rb_raise(rb_eTypeError, "can't make subclass of singleton class");
+    if (RCLASS_SINGLETON_P(super)) {
+        rb_raise(rb_eTypeError, "can't make subclass of singleton class");
     }
     if (super == rb_cClass) {
-	rb_raise(rb_eTypeError, "can't make subclass of Class");
+        rb_raise(rb_eTypeError, "can't make subclass of Class");
     }
 }
 
@@ -331,7 +972,15 @@ rb_class_new(VALUE super)
 {
     Check_Type(super, T_CLASS);
     rb_check_inheritable(super);
-    return rb_class_boot(super);
+    VALUE klass = rb_class_boot(super);
+
+    if (super != rb_cObject && super != rb_cBasicObject) {
+        RCLASS_SET_MAX_IV_COUNT(klass, RCLASS_MAX_IV_COUNT(super));
+    }
+
+    RUBY_ASSERT(getenv("RUBY_BOX") || RCLASS_PRIME_CLASSEXT_WRITABLE_P(klass));
+
+    return klass;
 }
 
 VALUE
@@ -344,12 +993,11 @@ static void
 clone_method(VALUE old_klass, VALUE new_klass, ID mid, const rb_method_entry_t *me)
 {
     if (me->def->type == VM_METHOD_TYPE_ISEQ) {
-	rb_cref_t *new_cref;
-	rb_vm_rewrite_cref(me->def->body.iseq.cref, old_klass, new_klass, &new_cref);
-	rb_add_method_iseq(new_klass, mid, me->def->body.iseq.iseqptr, new_cref, METHOD_ENTRY_VISI(me));
+        rb_cref_t *new_cref = rb_vm_rewrite_cref(me->def->body.iseq.cref, old_klass, new_klass);
+        rb_add_method_iseq(new_klass, mid, me->def->body.iseq.iseqptr, new_cref, METHOD_ENTRY_VISI(me));
     }
     else {
-	rb_method_entry_set(new_klass, mid, me, METHOD_ENTRY_VISI(me));
+        rb_method_entry_set(new_klass, mid, me, METHOD_ENTRY_VISI(me));
     }
 }
 
@@ -393,72 +1041,88 @@ static void
 class_init_copy_check(VALUE clone, VALUE orig)
 {
     if (orig == rb_cBasicObject) {
-	rb_raise(rb_eTypeError, "can't copy the root class");
+        rb_raise(rb_eTypeError, "can't copy the root class");
     }
-    if (RCLASS_SUPER(clone) != 0 || clone == rb_cBasicObject) {
-	rb_raise(rb_eTypeError, "already initialized class");
+    if (RCLASS_INITIALIZED_P(clone)) {
+        rb_raise(rb_eTypeError, "already initialized class");
     }
-    if (FL_TEST(orig, FL_SINGLETON)) {
-	rb_raise(rb_eTypeError, "can't copy singleton class");
+    if (RCLASS_SINGLETON_P(orig)) {
+        rb_raise(rb_eTypeError, "can't copy singleton class");
     }
 }
 
+struct cvc_table_copy_ctx {
+    VALUE clone;
+    struct rb_id_table * new_table;
+};
+
+static enum rb_id_table_iterator_result
+cvc_table_copy(ID id, VALUE val, void *data)
+{
+    struct cvc_table_copy_ctx *ctx = (struct cvc_table_copy_ctx *)data;
+    struct rb_cvar_class_tbl_entry * orig_entry;
+    orig_entry = (struct rb_cvar_class_tbl_entry *)val;
+
+    struct rb_cvar_class_tbl_entry *ent;
+
+    ent = ALLOC(struct rb_cvar_class_tbl_entry);
+    ent->class_value = ctx->clone;
+    ent->cref = orig_entry->cref;
+    ent->global_cvar_state = orig_entry->global_cvar_state;
+    rb_id_table_insert(ctx->new_table, id, (VALUE)ent);
+
+    RB_OBJ_WRITTEN(ctx->clone, Qundef, ent->cref);
+
+    return ID_TABLE_CONTINUE;
+}
+
 static void
 copy_tables(VALUE clone, VALUE orig)
 {
-    if (RCLASS_IV_TBL(clone)) {
-	st_free_table(RCLASS_IV_TBL(clone));
-	RCLASS_IV_TBL(clone) = 0;
-    }
     if (RCLASS_CONST_TBL(clone)) {
-	rb_free_const_table(RCLASS_CONST_TBL(clone));
-	RCLASS_CONST_TBL(clone) = 0;
+        rb_free_const_table(RCLASS_CONST_TBL(clone));
+        RCLASS_WRITE_CONST_TBL(clone, 0, false);
     }
-    RCLASS_M_TBL(clone) = 0;
-    if (RCLASS_IV_TBL(orig)) {
-	st_data_t id;
+    if (RCLASS_CVC_TBL(orig)) {
+        struct rb_id_table *rb_cvc_tbl = RCLASS_CVC_TBL(orig);
+        struct rb_id_table *rb_cvc_tbl_dup = rb_id_table_create(rb_id_table_size(rb_cvc_tbl));
 
-	rb_iv_tbl_copy(clone, orig);
-	CONST_ID(id, "__tmp_classpath__");
-	st_delete(RCLASS_IV_TBL(clone), &id, 0);
-	CONST_ID(id, "__classpath__");
-	st_delete(RCLASS_IV_TBL(clone), &id, 0);
-	CONST_ID(id, "__classid__");
-	st_delete(RCLASS_IV_TBL(clone), &id, 0);
+        struct cvc_table_copy_ctx ctx;
+        ctx.clone = clone;
+        ctx.new_table = rb_cvc_tbl_dup;
+        rb_id_table_foreach(rb_cvc_tbl, cvc_table_copy, &ctx);
+        RCLASS_WRITE_CVC_TBL(clone, rb_cvc_tbl_dup);
+    }
+    rb_id_table_free(RCLASS_M_TBL(clone));
+    RCLASS_WRITE_M_TBL(clone, 0);
+    if (!RB_TYPE_P(clone, T_ICLASS)) {
+        rb_fields_tbl_copy(clone, orig);
     }
     if (RCLASS_CONST_TBL(orig)) {
-	struct clone_const_arg arg;
-
-	arg.tbl = RCLASS_CONST_TBL(clone) = rb_id_table_create(0);
-	arg.klass = clone;
-	rb_id_table_foreach(RCLASS_CONST_TBL(orig), clone_const_i, &arg);
+        struct clone_const_arg arg;
+        struct rb_id_table *const_tbl;
+        struct rb_id_table *orig_tbl = RCLASS_CONST_TBL(orig);
+        arg.tbl = const_tbl = rb_id_table_create(rb_id_table_size(orig_tbl));
+        arg.klass = clone;
+        rb_id_table_foreach(orig_tbl, clone_const_i, &arg);
+        RCLASS_WRITE_CONST_TBL(clone, const_tbl, false);
     }
 }
 
 static bool ensure_origin(VALUE klass);
 
-/**
- * If this flag is set, that module is allocated but not initialized yet.
- */
-enum {RMODULE_ALLOCATED_BUT_NOT_INITIALIZED = RUBY_FL_USER5};
-
-static inline bool
-RMODULE_UNINITIALIZED(VALUE module)
-{
-    return FL_TEST_RAW(module, RMODULE_ALLOCATED_BUT_NOT_INITIALIZED);
-}
-
 void
-rb_module_set_initialized(VALUE mod)
+rb_class_set_initialized(VALUE klass)
 {
-    FL_UNSET_RAW(mod, RMODULE_ALLOCATED_BUT_NOT_INITIALIZED);
+    RUBY_ASSERT(RB_TYPE_P(klass, T_CLASS) || RB_TYPE_P(klass, T_MODULE));
+    FL_SET_RAW(klass, RCLASS_IS_INITIALIZED);
     /* no more re-initialization */
 }
 
 void
 rb_module_check_initializable(VALUE mod)
 {
-    if (!RMODULE_UNINITIALIZED(mod)) {
+    if (RCLASS_INITIALIZED_P(mod)) {
         rb_raise(rb_eTypeError, "already initialized module");
     }
 }
@@ -467,9 +1131,11 @@ rb_module_check_initializable(VALUE mod)
 VALUE
 rb_mod_init_copy(VALUE clone, VALUE orig)
 {
+    /* Only class or module is valid here, but other classes may enter here and
+     * only hit an exception on the OBJ_INIT_COPY checks
+     */
     switch (BUILTIN_TYPE(clone)) {
       case T_CLASS:
-      case T_ICLASS:
         class_init_copy_check(clone, orig);
         break;
       case T_MODULE:
@@ -480,34 +1146,41 @@ rb_mod_init_copy(VALUE clone, VALUE orig)
     }
     if (!OBJ_INIT_COPY(clone, orig)) return clone;
 
+    RUBY_ASSERT(RB_TYPE_P(orig, T_CLASS) || RB_TYPE_P(orig, T_MODULE));
+    RUBY_ASSERT(BUILTIN_TYPE(clone) == BUILTIN_TYPE(orig));
+
+    rb_class_set_initialized(clone);
+
     /* cloned flag is refer at constant inline cache
      * see vm_get_const_key_cref() in vm_insnhelper.c
      */
-    FL_SET(clone, RCLASS_CLONED);
-    FL_SET(orig , RCLASS_CLONED);
+    RCLASS_SET_CLONED(clone, true);
+    RCLASS_SET_CLONED(orig, true);
 
-    if (!FL_TEST(CLASS_OF(clone), FL_SINGLETON)) {
+    if (!RCLASS_SINGLETON_P(CLASS_OF(clone))) {
         RBASIC_SET_CLASS(clone, rb_singleton_class_clone(orig));
         rb_singleton_class_attached(METACLASS_OF(clone), (VALUE)clone);
     }
-    RCLASS_ALLOCATOR(clone) = RCLASS_ALLOCATOR(orig);
+    if (BUILTIN_TYPE(clone) == T_CLASS) {
+        RCLASS_SET_ALLOCATOR(clone, RCLASS_ALLOCATOR(orig));
+    }
     copy_tables(clone, orig);
     if (RCLASS_M_TBL(orig)) {
-	struct clone_method_arg arg;
-	arg.old_klass = orig;
-	arg.new_klass = clone;
-	RCLASS_M_TBL_INIT(clone);
-	rb_id_table_foreach(RCLASS_M_TBL(orig), clone_method_i, &arg);
+        struct clone_method_arg arg;
+        arg.old_klass = orig;
+        arg.new_klass = clone;
+        class_initialize_method_table(clone);
+        rb_id_table_foreach(RCLASS_M_TBL(orig), clone_method_i, &arg);
     }
 
     if (RCLASS_ORIGIN(orig) == orig) {
-        RCLASS_SET_SUPER(clone, RCLASS_SUPER(orig));
+        rb_class_set_super(clone, RCLASS_SUPER(orig));
     }
     else {
         VALUE p = RCLASS_SUPER(orig);
         VALUE orig_origin = RCLASS_ORIGIN(orig);
         VALUE prev_clone_p = clone;
-        VALUE origin_stack = rb_ary_tmp_new(2);
+        VALUE origin_stack = rb_ary_hidden_new(2);
         VALUE origin[2];
         VALUE clone_p = 0;
         long origin_len;
@@ -521,13 +1194,11 @@ rb_mod_init_copy(VALUE clone, VALUE orig)
             if (BUILTIN_TYPE(p) != T_ICLASS) {
                 rb_bug("non iclass between module/class and origin");
             }
-            clone_p = class_alloc(RBASIC(p)->flags, METACLASS_OF(p));
-            RCLASS_SET_SUPER(prev_clone_p, clone_p);
+            clone_p = class_alloc(T_ICLASS, METACLASS_OF(p));
+            RCLASS_SET_M_TBL(clone_p, RCLASS_M_TBL(p));
+            rb_class_set_super(prev_clone_p, clone_p);
             prev_clone_p = clone_p;
-            RCLASS_M_TBL(clone_p) = RCLASS_M_TBL(p);
-            RCLASS_CONST_TBL(clone_p) = RCLASS_CONST_TBL(p);
-            RCLASS_IV_TBL(clone_p) = RCLASS_IV_TBL(p);
-            RCLASS_ALLOCATOR(clone_p) = RCLASS_ALLOCATOR(p);
+            RCLASS_SET_CONST_TBL(clone_p, RCLASS_CONST_TBL(p), false);
             if (RB_TYPE_P(clone, T_CLASS)) {
                 RCLASS_SET_INCLUDER(clone_p, clone);
             }
@@ -539,8 +1210,8 @@ rb_mod_init_copy(VALUE clone, VALUE orig)
             }
             else if ((origin_len = RARRAY_LEN(origin_stack)) > 1 &&
                      RARRAY_AREF(origin_stack, origin_len - 1) == p) {
-                RCLASS_SET_ORIGIN(RARRAY_AREF(origin_stack, (origin_len -= 2)), clone_p);
-                RICLASS_SET_ORIGIN_SHARED_MTBL(clone_p);
+                RCLASS_WRITE_ORIGIN(RARRAY_AREF(origin_stack, (origin_len -= 2)), clone_p);
+                RICLASS_WRITE_ORIGIN_SHARED_MTBL(clone_p);
                 rb_ary_resize(origin_stack, origin_len);
                 add_subclass = FALSE;
             }
@@ -552,15 +1223,15 @@ rb_mod_init_copy(VALUE clone, VALUE orig)
 
         if (p == orig_origin) {
             if (clone_p) {
-                RCLASS_SET_SUPER(clone_p, clone_origin);
-                RCLASS_SET_SUPER(clone_origin, RCLASS_SUPER(orig_origin));
+                rb_class_set_super(clone_p, clone_origin);
+                rb_class_set_super(clone_origin, RCLASS_SUPER(orig_origin));
             }
             copy_tables(clone_origin, orig_origin);
             if (RCLASS_M_TBL(orig_origin)) {
                 struct clone_method_arg arg;
                 arg.old_klass = orig;
                 arg.new_klass = clone;
-                RCLASS_M_TBL_INIT(clone_origin);
+                class_initialize_method_table(clone_origin);
                 rb_id_table_foreach(RCLASS_M_TBL(orig_origin), clone_method_i, &arg);
             }
         }
@@ -590,62 +1261,64 @@ rb_singleton_class_clone_and_attach(VALUE obj, VALUE attach)
     // attached to an object other than `obj`. In which case `obj` does not have
     // a material singleton class attached yet and there is no singleton class
     // to clone.
-    if (!(FL_TEST(klass, FL_SINGLETON) && rb_attr_get(klass, id_attached) == obj)) {
+    if (!(RCLASS_SINGLETON_P(klass) && RCLASS_ATTACHED_OBJECT(klass) == obj)) {
         // nothing to clone
         return klass;
     }
     else {
-	/* copy singleton(unnamed) class */
+        /* copy singleton(unnamed) class */
         bool klass_of_clone_is_new;
-	VALUE clone = class_alloc(RBASIC(klass)->flags, 0);
+        RUBY_ASSERT(RB_TYPE_P(klass, T_CLASS));
+        VALUE clone = class_alloc(T_CLASS, 0);
 
-	if (BUILTIN_TYPE(obj) == T_CLASS) {
+        if (BUILTIN_TYPE(obj) == T_CLASS) {
             klass_of_clone_is_new = true;
-	    RBASIC_SET_CLASS(clone, clone);
-	}
-	else {
+            RBASIC_SET_CLASS(clone, clone);
+        }
+        else {
             VALUE klass_metaclass_clone = rb_singleton_class_clone(klass);
             // When `METACLASS_OF(klass) == klass_metaclass_clone`, it means the
             // recursive call did not clone `METACLASS_OF(klass)`.
             klass_of_clone_is_new = (METACLASS_OF(klass) != klass_metaclass_clone);
             RBASIC_SET_CLASS(clone, klass_metaclass_clone);
-	}
-
-	RCLASS_SET_SUPER(clone, RCLASS_SUPER(klass));
-	RCLASS_ALLOCATOR(clone) = RCLASS_ALLOCATOR(klass);
-	if (RCLASS_IV_TBL(klass)) {
-	    rb_iv_tbl_copy(clone, klass);
-	}
-	if (RCLASS_CONST_TBL(klass)) {
-	    struct clone_const_arg arg;
-	    arg.tbl = RCLASS_CONST_TBL(clone) = rb_id_table_create(0);
-	    arg.klass = clone;
-	    rb_id_table_foreach(RCLASS_CONST_TBL(klass), clone_const_i, &arg);
-	}
-	if (attach != Qundef) {
-	    rb_singleton_class_attached(clone, attach);
-	}
-	RCLASS_M_TBL_INIT(clone);
-	{
-	    struct clone_method_arg arg;
-	    arg.old_klass = klass;
-	    arg.new_klass = clone;
-	    rb_id_table_foreach(RCLASS_M_TBL(klass), clone_method_i, &arg);
-	}
+        }
+
+        // initialize method table before any GC chance
+        class_initialize_method_table(clone);
+
+        rb_class_set_super(clone, RCLASS_SUPER(klass));
+        rb_fields_tbl_copy(clone, klass);
+        if (RCLASS_CONST_TBL(klass)) {
+            struct clone_const_arg arg;
+            struct rb_id_table *table;
+            arg.tbl = table = rb_id_table_create(rb_id_table_size(RCLASS_CONST_TBL(klass)));
+            arg.klass = clone;
+            rb_id_table_foreach(RCLASS_CONST_TBL(klass), clone_const_i, &arg);
+            RCLASS_SET_CONST_TBL(clone, table, false);
+        }
+        if (!UNDEF_P(attach)) {
+            rb_singleton_class_attached(clone, attach);
+        }
+        {
+            struct clone_method_arg arg;
+            arg.old_klass = klass;
+            arg.new_klass = clone;
+            rb_id_table_foreach(RCLASS_M_TBL(klass), clone_method_i, &arg);
+        }
         if (klass_of_clone_is_new) {
             rb_singleton_class_attached(METACLASS_OF(clone), clone);
         }
-	FL_SET(clone, FL_SINGLETON);
+        FL_SET(clone, FL_SINGLETON);
 
-	return clone;
+        return clone;
     }
 }
 
 void
 rb_singleton_class_attached(VALUE klass, VALUE obj)
 {
-    if (FL_TEST(klass, FL_SINGLETON)) {
-	rb_class_ivar_set(klass, id_attached, obj);
+    if (RCLASS_SINGLETON_P(klass)) {
+        RCLASS_SET_ATTACHED_OBJECT(klass, obj);
     }
 }
 
@@ -659,17 +1332,17 @@ rb_singleton_class_attached(VALUE klass, VALUE obj)
 static int
 rb_singleton_class_has_metaclass_p(VALUE sklass)
 {
-    return rb_attr_get(METACLASS_OF(sklass), id_attached) == sklass;
+    return RCLASS_ATTACHED_OBJECT(METACLASS_OF(sklass)) == sklass;
 }
 
 int
 rb_singleton_class_internal_p(VALUE sklass)
 {
-    return (RB_TYPE_P(rb_attr_get(sklass, id_attached), T_CLASS) &&
-	    !rb_singleton_class_has_metaclass_p(sklass));
+    return (RB_TYPE_P(RCLASS_ATTACHED_OBJECT(sklass), T_CLASS) &&
+            !rb_singleton_class_has_metaclass_p(sklass));
 }
 
-/*!
+/**
  * whether k has a metaclass
  * @retval 1 if \a k has a metaclass
  * @retval 0 otherwise
@@ -678,48 +1351,49 @@ rb_singleton_class_internal_p(VALUE sklass)
     (FL_TEST(METACLASS_OF(k), FL_SINGLETON) && \
      rb_singleton_class_has_metaclass_p(k))
 
-/*!
- * ensures \a klass belongs to its own eigenclass.
- * @return the eigenclass of \a klass
- * @post \a klass belongs to the returned eigenclass.
- *       i.e. the attached object of the eigenclass is \a klass.
+/**
+ * ensures `klass` belongs to its own eigenclass.
+ * @return the eigenclass of `klass`
+ * @post `klass` belongs to the returned eigenclass.
+ *       i.e. the attached object of the eigenclass is `klass`.
  * @note this macro creates a new eigenclass if necessary.
  */
 #define ENSURE_EIGENCLASS(klass) \
     (HAVE_METACLASS_P(klass) ? METACLASS_OF(klass) : make_metaclass(klass))
 
 
-/*!
- * Creates a metaclass of \a klass
- * \param klass     a class
- * \return          created metaclass for the class
- * \pre \a klass is a Class object
- * \pre \a klass has no singleton class.
- * \post the class of \a klass is the returned class.
- * \post the returned class is meta^(n+1)-class when \a klass is a meta^(n)-klass for n >= 0
+/**
+ * Creates a metaclass of `klass`
+ * @param klass     a class
+ * @return          created metaclass for the class
+ * @pre `klass` is a Class object
+ * @pre `klass` has no singleton class.
+ * @post the class of `klass` is the returned class.
+ * @post the returned class is meta^(n+1)-class when `klass` is a meta^(n)-klass for n >= 0
  */
 static inline VALUE
 make_metaclass(VALUE klass)
 {
     VALUE super;
-    VALUE metaclass = rb_class_boot(Qundef);
+    VALUE metaclass = class_boot_boxable(Qundef, FL_TEST_RAW(klass, RCLASS_BOXABLE));
 
     FL_SET(metaclass, FL_SINGLETON);
     rb_singleton_class_attached(metaclass, klass);
 
     if (META_CLASS_OF_CLASS_CLASS_P(klass)) {
-	SET_METACLASS_OF(klass, metaclass);
-	SET_METACLASS_OF(metaclass, metaclass);
+        SET_METACLASS_OF(klass, metaclass);
+        SET_METACLASS_OF(metaclass, metaclass);
     }
     else {
-	VALUE tmp = METACLASS_OF(klass); /* for a meta^(n)-class klass, tmp is meta^(n)-class of Class class */
-	SET_METACLASS_OF(klass, metaclass);
-	SET_METACLASS_OF(metaclass, ENSURE_EIGENCLASS(tmp));
+        VALUE tmp = METACLASS_OF(klass); /* for a meta^(n)-class klass, tmp is meta^(n)-class of Class class */
+        SET_METACLASS_OF(klass, metaclass);
+        SET_METACLASS_OF(metaclass, ENSURE_EIGENCLASS(tmp));
     }
 
     super = RCLASS_SUPER(klass);
     while (RB_TYPE_P(super, T_ICLASS)) super = RCLASS_SUPER(super);
-    RCLASS_SET_SUPER(metaclass, super ? ENSURE_EIGENCLASS(super) : rb_cClass);
+    class_associate_super(metaclass, super ? ENSURE_EIGENCLASS(super) : rb_cClass, true);
+    rb_class_set_initialized(klass);
 
     // Full class ancestry may not have been filled until we reach here.
     rb_class_update_superclasses(METACLASS_OF(metaclass));
@@ -727,21 +1401,23 @@ make_metaclass(VALUE klass)
     return metaclass;
 }
 
-/*!
- * Creates a singleton class for \a obj.
- * \pre \a obj must not a immediate nor a special const.
- * \pre \a obj must not a Class object.
- * \pre \a obj has no singleton class.
+/**
+ * Creates a singleton class for `obj`.
+ * @pre `obj` must not be an immediate nor a special const.
+ * @pre `obj` must not be a Class object.
+ * @pre `obj` has no singleton class.
  */
 static inline VALUE
 make_singleton_class(VALUE obj)
 {
     VALUE orig_class = METACLASS_OF(obj);
-    VALUE klass = rb_class_boot(orig_class);
+    VALUE klass = class_boot_boxable(orig_class, FL_TEST_RAW(orig_class, RCLASS_BOXABLE));
 
     FL_SET(klass, FL_SINGLETON);
     RBASIC_SET_CLASS(obj, klass);
     rb_singleton_class_attached(klass, obj);
+    rb_yjit_invalidate_no_singleton_class(orig_class);
+    rb_zjit_invalidate_no_singleton_class(orig_class);
 
     SET_METACLASS_OF(klass, METACLASS_OF(rb_class_real(orig_class)));
     return klass;
@@ -755,7 +1431,7 @@ boot_defclass(const char *name, VALUE super)
     ID id = rb_intern(name);
 
     rb_const_set((rb_cObject ? rb_cObject : obj), id, obj);
-    rb_vm_add_root_module(obj);
+    rb_vm_register_global_object(obj);
     return obj;
 }
 
@@ -811,12 +1487,33 @@ refinement_import_methods(int argc, VALUE *argv, VALUE refinement)
 }
 # endif
 
+/*!
+ *--
+ * \private
+ * Initializes the world of objects and classes.
+ *
+ * At first, the function bootstraps the class hierarchy.
+ * It initializes the most fundamental classes and their metaclasses.
+ * - \c BasicObject
+ * - \c Object
+ * - \c Module
+ * - \c Class
+ * After the bootstrap step, the class hierarchy becomes as the following
+ * diagram.
+ *
+ * \image html boottime-classes.png
+ *
+ * Then, the function defines classes, modules and methods as usual.
+ * \ingroup class
+ *++
+ */
+
 void
 Init_class_hierarchy(void)
 {
     rb_cBasicObject = boot_defclass("BasicObject", 0);
     rb_cObject = boot_defclass("Object", rb_cBasicObject);
-    rb_gc_register_mark_object(rb_cObject);
+    rb_vm_register_global_object(rb_cObject);
 
     /* resolve class name ASAP for order-independence */
     rb_set_class_path_string(rb_cObject, rb_cObject, rb_fstring_lit("Object"));
@@ -841,24 +1538,24 @@ Init_class_hierarchy(void)
 }
 
 
-/*!
- * \internal
+/**
+ * @internal
  * Creates a new *singleton class* for an object.
  *
- * \pre \a obj has no singleton class.
- * \note DO NOT USE the function in an extension libraries. Use \ref rb_singleton_class.
- * \param obj     An object.
- * \param unused  ignored.
- * \return        The singleton class of the object.
+ * @pre `obj` has no singleton class.
+ * @note DO NOT USE the function in an extension libraries. Use @ref rb_singleton_class.
+ * @param obj     An object.
+ * @param unused  ignored.
+ * @return        The singleton class of the object.
  */
 VALUE
 rb_make_metaclass(VALUE obj, VALUE unused)
 {
     if (BUILTIN_TYPE(obj) == T_CLASS) {
-	return make_metaclass(obj);
+        return make_metaclass(obj);
     }
     else {
-	return make_singleton_class(obj);
+        return make_singleton_class(obj);
     }
 }
 
@@ -875,15 +1572,15 @@ rb_define_class_id(ID id, VALUE super)
 }
 
 
-/*!
+/**
  * Calls Class#inherited.
- * \param super  A class which will be called #inherited.
+ * @param super  A class which will be called #inherited.
  *               NULL means Object class.
- * \param klass  A Class object which derived from \a super
- * \return the value \c Class#inherited's returns
- * \pre Each of \a super and \a klass must be a \c Class object.
+ * @param klass  A Class object which derived from `super`
+ * @return the value `Class#inherited` returns
+ * @pre Each of `super` and `klass` must be a `Class` object.
  */
-MJIT_FUNC_EXPORTED VALUE
+VALUE
 rb_class_inherited(VALUE super, VALUE klass)
 {
     ID inherited;
@@ -896,28 +1593,27 @@ VALUE
 rb_define_class(const char *name, VALUE super)
 {
     VALUE klass;
-    ID id;
+    ID id = rb_intern(name);
 
-    id = rb_intern(name);
     if (rb_const_defined(rb_cObject, id)) {
-	klass = rb_const_get(rb_cObject, id);
-	if (!RB_TYPE_P(klass, T_CLASS)) {
-	    rb_raise(rb_eTypeError, "%s is not a class (%"PRIsVALUE")",
-		     name, rb_obj_class(klass));
-	}
-	if (rb_class_real(RCLASS_SUPER(klass)) != super) {
-	    rb_raise(rb_eTypeError, "superclass mismatch for class %s", name);
-	}
+        klass = rb_const_get(rb_cObject, id);
+        if (!RB_TYPE_P(klass, T_CLASS)) {
+            rb_raise(rb_eTypeError, "%s is not a class (%"PRIsVALUE")",
+                     name, rb_obj_class(klass));
+        }
+        if (rb_class_real(RCLASS_SUPER(klass)) != super) {
+            rb_raise(rb_eTypeError, "superclass mismatch for class %s", name);
+        }
 
         /* Class may have been defined in Ruby and not pin-rooted */
-        rb_vm_add_root_module(klass);
-	return klass;
+        rb_vm_register_global_object(klass);
+        return klass;
     }
     if (!super) {
-	rb_raise(rb_eArgError, "no super class for `%s'", name);
+        rb_raise(rb_eArgError, "no super class for '%s'", name);
     }
     klass = rb_define_class_id(id, super);
-    rb_vm_add_root_module(klass);
+    rb_vm_register_global_object(klass);
     rb_const_set(rb_cObject, id, klass);
     rb_class_inherited(super, klass);
 
@@ -931,47 +1627,51 @@ rb_define_class_under(VALUE outer, const char *name, VALUE super)
 }
 
 VALUE
-rb_define_class_id_under(VALUE outer, ID id, VALUE super)
+rb_define_class_id_under_no_pin(VALUE outer, ID id, VALUE super)
 {
     VALUE klass;
 
     if (rb_const_defined_at(outer, id)) {
-	klass = rb_const_get_at(outer, id);
-	if (!RB_TYPE_P(klass, T_CLASS)) {
-	    rb_raise(rb_eTypeError, "%"PRIsVALUE"::%"PRIsVALUE" is not a class"
-		     " (%"PRIsVALUE")",
-		     outer, rb_id2str(id), rb_obj_class(klass));
-	}
-	if (rb_class_real(RCLASS_SUPER(klass)) != super) {
-	    rb_raise(rb_eTypeError, "superclass mismatch for class "
-		     "%"PRIsVALUE"::%"PRIsVALUE""
-		     " (%"PRIsVALUE" is given but was %"PRIsVALUE")",
-		     outer, rb_id2str(id), RCLASS_SUPER(klass), super);
-	}
-        /* Class may have been defined in Ruby and not pin-rooted */
-        rb_vm_add_root_module(klass);
+        klass = rb_const_get_at(outer, id);
+        if (!RB_TYPE_P(klass, T_CLASS)) {
+            rb_raise(rb_eTypeError, "%"PRIsVALUE"::%"PRIsVALUE" is not a class"
+                     " (%"PRIsVALUE")",
+                     outer, rb_id2str(id), rb_obj_class(klass));
+        }
+        if (rb_class_real(RCLASS_SUPER(klass)) != super) {
+            rb_raise(rb_eTypeError, "superclass mismatch for class "
+                     "%"PRIsVALUE"::%"PRIsVALUE""
+                     " (%"PRIsVALUE" is given but was %"PRIsVALUE")",
+                     outer, rb_id2str(id), RCLASS_SUPER(klass), super);
+        }
 
-	return klass;
+        return klass;
     }
     if (!super) {
-	rb_raise(rb_eArgError, "no super class for `%"PRIsVALUE"::%"PRIsVALUE"'",
-		 rb_class_path(outer), rb_id2str(id));
+        rb_raise(rb_eArgError, "no super class for '%"PRIsVALUE"::%"PRIsVALUE"'",
+                 rb_class_path(outer), rb_id2str(id));
     }
     klass = rb_define_class_id(id, super);
     rb_set_class_path_string(klass, outer, rb_id2str(id));
     rb_const_set(outer, id, klass);
     rb_class_inherited(super, klass);
-    rb_vm_add_root_module(klass);
 
     return klass;
 }
 
 VALUE
+rb_define_class_id_under(VALUE outer, ID id, VALUE super)
+{
+    VALUE klass = rb_define_class_id_under_no_pin(outer, id, super);
+    rb_vm_register_global_object(klass);
+    return klass;
+}
+
+VALUE
 rb_module_s_alloc(VALUE klass)
 {
     VALUE mod = class_alloc(T_MODULE, klass);
-    RCLASS_M_TBL_INIT(mod);
-    FL_SET(mod, RMODULE_ALLOCATED_BUT_NOT_INITIALIZED);
+    class_initialize_method_table(mod);
     return mod;
 }
 
@@ -979,7 +1679,7 @@ static inline VALUE
 module_new(VALUE klass)
 {
     VALUE mdl = class_alloc(T_MODULE, klass);
-    RCLASS_M_TBL_INIT(mdl);
+    class_initialize_method_table(mdl);
     return (VALUE)mdl;
 }
 
@@ -1006,21 +1706,20 @@ VALUE
 rb_define_module(const char *name)
 {
     VALUE module;
-    ID id;
+    ID id = rb_intern(name);
 
-    id = rb_intern(name);
     if (rb_const_defined(rb_cObject, id)) {
-	module = rb_const_get(rb_cObject, id);
-	if (!RB_TYPE_P(module, T_MODULE)) {
-	    rb_raise(rb_eTypeError, "%s is not a module (%"PRIsVALUE")",
-		     name, rb_obj_class(module));
-	}
+        module = rb_const_get(rb_cObject, id);
+        if (!RB_TYPE_P(module, T_MODULE)) {
+            rb_raise(rb_eTypeError, "%s is not a module (%"PRIsVALUE")",
+                     name, rb_obj_class(module));
+        }
         /* Module may have been defined in Ruby and not pin-rooted */
-        rb_vm_add_root_module(module);
-	return module;
+        rb_vm_register_global_object(module);
+        return module;
     }
     module = rb_module_new();
-    rb_vm_add_root_module(module);
+    rb_vm_register_global_object(module);
     rb_const_set(rb_cObject, id, module);
 
     return module;
@@ -1038,20 +1737,20 @@ rb_define_module_id_under(VALUE outer, ID id)
     VALUE module;
 
     if (rb_const_defined_at(outer, id)) {
-	module = rb_const_get_at(outer, id);
-	if (!RB_TYPE_P(module, T_MODULE)) {
-	    rb_raise(rb_eTypeError, "%"PRIsVALUE"::%"PRIsVALUE" is not a module"
-		     " (%"PRIsVALUE")",
-		     outer, rb_id2str(id), rb_obj_class(module));
-	}
+        module = rb_const_get_at(outer, id);
+        if (!RB_TYPE_P(module, T_MODULE)) {
+            rb_raise(rb_eTypeError, "%"PRIsVALUE"::%"PRIsVALUE" is not a module"
+                     " (%"PRIsVALUE")",
+                     outer, rb_id2str(id), rb_obj_class(module));
+        }
         /* Module may have been defined in Ruby and not pin-rooted */
-        rb_gc_register_mark_object(module);
-	return module;
+        rb_vm_register_global_object(module);
+        return module;
     }
     module = rb_module_new();
     rb_const_set(outer, id, module);
     rb_set_class_path_string(module, outer, rb_id2str(id));
-    rb_gc_register_mark_object(module);
+    rb_vm_register_global_object(module);
 
     return module;
 }
@@ -1061,24 +1760,24 @@ rb_include_class_new(VALUE module, VALUE super)
 {
     VALUE klass = class_alloc(T_ICLASS, rb_cClass);
 
-    RCLASS_M_TBL(klass) = RCLASS_M_TBL(module);
+    RCLASS_SET_M_TBL(klass, RCLASS_WRITABLE_M_TBL(module));
 
     RCLASS_SET_ORIGIN(klass, klass);
     if (BUILTIN_TYPE(module) == T_ICLASS) {
-	module = METACLASS_OF(module);
+        module = METACLASS_OF(module);
     }
     RUBY_ASSERT(!RB_TYPE_P(module, T_ICLASS));
-    if (!RCLASS_IV_TBL(module)) {
-	RCLASS_IV_TBL(module) = st_init_numtable();
+    if (RCLASS_WRITABLE_CONST_TBL(module)) {
+        RCLASS_SET_CONST_TBL(klass, RCLASS_WRITABLE_CONST_TBL(module), true);
     }
-    if (!RCLASS_CONST_TBL(module)) {
-	RCLASS_CONST_TBL(module) = rb_id_table_create(0);
+    else {
+        RCLASS_WRITE_CONST_TBL(module, rb_id_table_create(0), false);
+        RCLASS_SET_CONST_TBL(klass, RCLASS_WRITABLE_CONST_TBL(module), true);
     }
-    RCLASS_IV_TBL(klass) = RCLASS_IV_TBL(module);
-    RCLASS_CVC_TBL(klass) = RCLASS_CVC_TBL(module);
-    RCLASS_CONST_TBL(klass) = RCLASS_CONST_TBL(module);
 
-    RCLASS_SET_SUPER(klass, super);
+    RCLASS_SET_CVC_TBL(klass, RCLASS_WRITABLE_CVC_TBL(module));
+
+    class_associate_super(klass, super, true);
     RBASIC_SET_CLASS(klass, module);
 
     return (VALUE)klass;
@@ -1091,9 +1790,9 @@ ensure_includable(VALUE klass, VALUE module)
 {
     rb_class_modify_check(klass);
     Check_Type(module, T_MODULE);
-    rb_module_set_initialized(module);
+    rb_class_set_initialized(module);
     if (!NIL_P(rb_refinement_module_get_refined_class(module))) {
-	rb_raise(rb_eArgError, "refinement module is not allowed");
+        rb_raise(rb_eArgError, "refinement module is not allowed");
     }
 }
 
@@ -1106,18 +1805,12 @@ rb_include_module(VALUE klass, VALUE module)
 
     changed = include_modules_at(klass, RCLASS_ORIGIN(klass), module, TRUE);
     if (changed < 0)
-	rb_raise(rb_eArgError, "cyclic include detected");
+        rb_raise(rb_eArgError, "cyclic include detected");
 
     if (RB_TYPE_P(klass, T_MODULE)) {
-        rb_subclass_entry_t *iclass = RCLASS_SUBCLASSES(klass);
-        // skip the placeholder subclass entry at the head of the list
-        if (iclass) {
-            RUBY_ASSERT(!iclass->klass);
-            iclass = iclass->next;
-        }
-
-        int do_include = 1;
+        rb_subclass_entry_t *iclass = RCLASS_SUBCLASSES_FIRST(klass);
         while (iclass) {
+            int do_include = 1;
             VALUE check_class = iclass->klass;
             /* During lazy sweeping, iclass->klass could be a dead object that
              * has not yet been swept. */
@@ -1184,7 +1877,7 @@ static int
 do_include_modules_at(const VALUE klass, VALUE c, VALUE module, int search_super, bool check_cyclic)
 {
     VALUE p, iclass, origin_stack = 0;
-    int method_changed = 0, add_subclass;
+    int method_changed = 0;
     long origin_len;
     VALUE klass_origin = RCLASS_ORIGIN(klass);
     VALUE original_klass = klass;
@@ -1194,8 +1887,8 @@ do_include_modules_at(const VALUE klass, VALUE c, VALUE module, int search_super
 
     while (module) {
         int c_seen = FALSE;
-	int superclass_seen = FALSE;
-	struct rb_id_table *tbl;
+        int superclass_seen = FALSE;
+        struct rb_id_table *tbl;
 
         if (klass == c) {
             c_seen = TRUE;
@@ -1245,42 +1938,38 @@ do_include_modules_at(const VALUE klass, VALUE c, VALUE module, int search_super
         }
 
         // setup T_ICLASS for the include/prepend module
-	iclass = rb_include_class_new(module, super_class);
-	c = RCLASS_SET_SUPER(c, iclass);
+        iclass = rb_include_class_new(module, super_class);
+        c = rb_class_set_super(c, iclass);
         RCLASS_SET_INCLUDER(iclass, klass);
-        add_subclass = TRUE;
         if (module != RCLASS_ORIGIN(module)) {
-            if (!origin_stack) origin_stack = rb_ary_tmp_new(2);
+            if (!origin_stack) origin_stack = rb_ary_hidden_new(2);
             VALUE origin[2] = {iclass, RCLASS_ORIGIN(module)};
             rb_ary_cat(origin_stack, origin, 2);
         }
         else if (origin_stack && (origin_len = RARRAY_LEN(origin_stack)) > 1 &&
                  RARRAY_AREF(origin_stack, origin_len - 1) == module) {
-            RCLASS_SET_ORIGIN(RARRAY_AREF(origin_stack, (origin_len -= 2)), iclass);
-            RICLASS_SET_ORIGIN_SHARED_MTBL(iclass);
+            RCLASS_WRITE_ORIGIN(RARRAY_AREF(origin_stack, (origin_len -= 2)), iclass);
+            RICLASS_WRITE_ORIGIN_SHARED_MTBL(iclass);
             rb_ary_resize(origin_stack, origin_len);
-            add_subclass = FALSE;
         }
 
-	if (add_subclass) {
-	    VALUE m = module;
-            if (BUILTIN_TYPE(m) == T_ICLASS) m = METACLASS_OF(m);
-            rb_module_add_to_subclasses_list(m, iclass);
-	}
+        VALUE m = module;
+        if (BUILTIN_TYPE(m) == T_ICLASS) m = METACLASS_OF(m);
+        rb_module_add_to_subclasses_list(m, iclass);
 
-	if (FL_TEST(klass, RMODULE_IS_REFINEMENT)) {
-	    VALUE refined_class =
-		rb_refinement_module_get_refined_class(klass);
+        if (BUILTIN_TYPE(klass) == T_MODULE && FL_TEST(klass, RMODULE_IS_REFINEMENT)) {
+            VALUE refined_class =
+                rb_refinement_module_get_refined_class(klass);
 
             rb_id_table_foreach(RCLASS_M_TBL(module), add_refined_method_entry_i, (void *)refined_class);
-	    FL_SET(c, RMODULE_INCLUDED_INTO_REFINEMENT);
-	}
+            RUBY_ASSERT(BUILTIN_TYPE(c) == T_MODULE);
+        }
 
         tbl = RCLASS_CONST_TBL(module);
-	if (tbl && rb_id_table_size(tbl))
-	    rb_id_table_foreach(tbl, clear_constant_cache_i, NULL);
+        if (tbl && rb_id_table_size(tbl))
+            rb_id_table_foreach(tbl, clear_constant_cache_i, NULL);
       skip:
-	module = RCLASS_SUPER(module);
+        module = RCLASS_SUPER(module);
     }
 
     return method_changed;
@@ -1299,23 +1988,23 @@ move_refined_method(ID key, VALUE value, void *data)
 
     if (me->def->type == VM_METHOD_TYPE_REFINED) {
         VALUE klass = (VALUE)data;
-        struct rb_id_table *tbl = RCLASS_M_TBL(klass);
+        struct rb_id_table *tbl = RCLASS_WRITABLE_M_TBL(klass);
 
         if (me->def->body.refined.orig_me) {
-	    const rb_method_entry_t *orig_me = me->def->body.refined.orig_me, *new_me;
-	    RB_OBJ_WRITE(me, &me->def->body.refined.orig_me, NULL);
-	    new_me = rb_method_entry_clone(me);
+            const rb_method_entry_t *orig_me = me->def->body.refined.orig_me, *new_me;
+            RB_OBJ_WRITE(me, &me->def->body.refined.orig_me, NULL);
+            new_me = rb_method_entry_clone(me);
             rb_method_table_insert(klass, tbl, key, new_me);
-	    rb_method_entry_copy(me, orig_me);
-	    return ID_TABLE_CONTINUE;
-	}
-	else {
+            rb_method_entry_copy(me, orig_me);
+            return ID_TABLE_CONTINUE;
+        }
+        else {
             rb_method_table_insert(klass, tbl, key, me);
-	    return ID_TABLE_DELETE;
-	}
+            return ID_TABLE_DELETE;
+        }
     }
     else {
-	return ID_TABLE_CONTINUE;
+        return ID_TABLE_CONTINUE;
     }
 }
 
@@ -1339,14 +2028,19 @@ ensure_origin(VALUE klass)
 {
     VALUE origin = RCLASS_ORIGIN(klass);
     if (origin == klass) {
-	origin = class_alloc(T_ICLASS, klass);
-	RCLASS_SET_SUPER(origin, RCLASS_SUPER(klass));
-	RCLASS_SET_SUPER(klass, origin);
-	RCLASS_SET_ORIGIN(klass, origin);
-	RCLASS_M_TBL(origin) = RCLASS_M_TBL(klass);
-	RCLASS_M_TBL_INIT(klass);
+        origin = class_alloc(T_ICLASS, klass);
+        RCLASS_SET_M_TBL(origin, RCLASS_M_TBL(klass));
+        rb_class_set_super(origin, RCLASS_SUPER(klass));
+        rb_class_set_super(klass, origin); // writes origin into RCLASS_SUPER(klass)
+        RCLASS_WRITE_ORIGIN(klass, origin);
+
+        // RCLASS_WRITE_ORIGIN marks origin as an origin, so this is the first
+        // point that it sees M_TBL and may mark it
+        rb_gc_writebarrier_remember(origin);
+
+        class_clear_method_table(klass);
         rb_id_table_foreach(RCLASS_M_TBL(origin), cache_clear_refined_method, (void *)klass);
-	rb_id_table_foreach(RCLASS_M_TBL(origin), move_refined_method, (void *)klass);
+        rb_id_table_foreach(RCLASS_M_TBL(origin), move_refined_method, (void *)klass);
         return true;
     }
     return false;
@@ -1366,16 +2060,10 @@ rb_prepend_module(VALUE klass, VALUE module)
     changed = do_include_modules_at(klass, klass, module, FALSE, false);
     RUBY_ASSERT(changed >= 0); // already checked for cyclic prepend above
     if (changed) {
-	rb_vm_check_redefinition_by_prepend(klass);
+        rb_vm_check_redefinition_by_prepend(klass);
     }
     if (RB_TYPE_P(klass, T_MODULE)) {
-        rb_subclass_entry_t *iclass = RCLASS_SUBCLASSES(klass);
-        // skip the placeholder subclass entry at the head of the list if it exists
-        if (iclass) {
-            RUBY_ASSERT(!iclass->klass);
-            iclass = iclass->next;
-        }
-
+        rb_subclass_entry_t *iclass = RCLASS_SUBCLASSES_FIRST(klass);
         VALUE klass_origin = RCLASS_ORIGIN(klass);
         struct rb_id_table *klass_m_tbl = RCLASS_M_TBL(klass);
         struct rb_id_table *klass_origin_m_tbl = RCLASS_M_TBL(klass_origin);
@@ -1387,11 +2075,11 @@ rb_prepend_module(VALUE klass, VALUE module)
                 if (klass_had_no_origin && klass_origin_m_tbl == RCLASS_M_TBL(subclass)) {
                     // backfill an origin iclass to handle refinements and future prepends
                     rb_id_table_foreach(RCLASS_M_TBL(subclass), clear_module_cache_i, (void *)subclass);
-                    RCLASS_M_TBL(subclass) = klass_m_tbl;
+                    RCLASS_WRITE_M_TBL(subclass, klass_m_tbl);
                     VALUE origin = rb_include_class_new(klass_origin, RCLASS_SUPER(subclass));
-                    RCLASS_SET_SUPER(subclass, origin);
+                    rb_class_set_super(subclass, origin);
                     RCLASS_SET_INCLUDER(origin, RCLASS_INCLUDER(subclass));
-                    RCLASS_SET_ORIGIN(subclass, origin);
+                    RCLASS_WRITE_ORIGIN(subclass, origin);
                     RICLASS_SET_ORIGIN_SHARED_MTBL(origin);
                 }
                 include_modules_at(subclass, subclass, module, FALSE);
@@ -1433,10 +2121,10 @@ rb_mod_included_modules(VALUE mod)
 
     for (p = RCLASS_SUPER(mod); p; p = RCLASS_SUPER(p)) {
         if (p != origin && RCLASS_ORIGIN(p) == p && BUILTIN_TYPE(p) == T_ICLASS) {
-	    VALUE m = METACLASS_OF(p);
-	    if (RB_TYPE_P(m, T_MODULE))
-		rb_ary_push(ary, m);
-	}
+            VALUE m = METACLASS_OF(p);
+            if (RB_TYPE_P(m, T_MODULE))
+                rb_ary_push(ary, m);
+        }
     }
     return ary;
 }
@@ -1467,9 +2155,9 @@ rb_mod_include_p(VALUE mod, VALUE mod2)
 
     Check_Type(mod2, T_MODULE);
     for (p = RCLASS_SUPER(mod); p; p = RCLASS_SUPER(p)) {
-        if (BUILTIN_TYPE(p) == T_ICLASS && !FL_TEST(p, RICLASS_IS_ORIGIN)) {
-	    if (METACLASS_OF(p) == mod2) return Qtrue;
-	}
+        if (BUILTIN_TYPE(p) == T_ICLASS && !RICLASS_IS_ORIGIN_P(p)) {
+            if (METACLASS_OF(p) == mod2) return Qtrue;
+        }
     }
     return Qfalse;
 }
@@ -1497,19 +2185,19 @@ rb_mod_ancestors(VALUE mod)
 {
     VALUE p, ary = rb_ary_new();
     VALUE refined_class = Qnil;
-    if (FL_TEST(mod, RMODULE_IS_REFINEMENT)) {
+    if (BUILTIN_TYPE(mod) == T_MODULE && FL_TEST(mod, RMODULE_IS_REFINEMENT)) {
         refined_class = rb_refinement_module_get_refined_class(mod);
     }
 
     for (p = mod; p; p = RCLASS_SUPER(p)) {
         if (p == refined_class) break;
         if (p != RCLASS_ORIGIN(p)) continue;
-	if (BUILTIN_TYPE(p) == T_ICLASS) {
-	    rb_ary_push(ary, METACLASS_OF(p));
-	}
+        if (BUILTIN_TYPE(p) == T_ICLASS) {
+            rb_ary_push(ary, METACLASS_OF(p));
+        }
         else {
-	    rb_ary_push(ary, p);
-	}
+            rb_ary_push(ary, p);
+        }
     }
     return ary;
 }
@@ -1527,7 +2215,7 @@ class_descendants_recursive(VALUE klass, VALUE v)
 {
     struct subclass_traverse_data *data = (struct subclass_traverse_data *) v;
 
-    if (BUILTIN_TYPE(klass) == T_CLASS && !FL_TEST(klass, FL_SINGLETON)) {
+    if (BUILTIN_TYPE(klass) == T_CLASS && !RCLASS_SINGLETON_P(klass)) {
         if (data->buffer && data->count < data->maxcount && !rb_objspace_garbage_object_p(klass)) {
             // assumes that this does not cause GC as long as the length does not exceed the capacity
             rb_ary_push(data->buffer, klass);
@@ -1583,6 +2271,27 @@ class_descendants(VALUE klass, bool immediate_only)
  *     A.subclasses        #=> [D, B]
  *     B.subclasses        #=> [C]
  *     C.subclasses        #=> []
+ *
+ *  Anonymous subclasses (not associated with a constant) are
+ *  returned, too:
+ *
+ *     c = Class.new(A)
+ *     A.subclasses        # => [#<Class:0x00007f003c77bd78>, D, B]
+ *
+ *  Note that the parent does not hold references to subclasses
+ *  and doesn't prevent them from being garbage collected. This
+ *  means that the subclass might disappear when all references
+ *  to it are dropped:
+ *
+ *     # drop the reference to subclass, it can be garbage-collected now
+ *     c = nil
+ *
+ *     A.subclasses
+ *     # It can be
+ *     #  => [#<Class:0x00007f003c77bd78>, D, B]
+ *     # ...or just
+ *     #  => [D, B]
+ *     # ...depending on whether garbage collector was run
  */
 
 VALUE
@@ -1591,6 +2300,33 @@ rb_class_subclasses(VALUE klass)
     return class_descendants(klass, true);
 }
 
+/*
+ *  call-seq:
+ *     attached_object -> object
+ *
+ *  Returns the object for which the receiver is the singleton class.
+ *
+ *  Raises an TypeError if the class is not a singleton class.
+ *
+ *     class Foo; end
+ *
+ *     Foo.singleton_class.attached_object        #=> Foo
+ *     Foo.attached_object                        #=> TypeError: `Foo' is not a singleton class
+ *     Foo.new.singleton_class.attached_object    #=> #<Foo:0x000000010491a370>
+ *     TrueClass.attached_object                  #=> TypeError: `TrueClass' is not a singleton class
+ *     NilClass.attached_object                   #=> TypeError: `NilClass' is not a singleton class
+ */
+
+VALUE
+rb_class_attached_object(VALUE klass)
+{
+    if (!RCLASS_SINGLETON_P(klass)) {
+        rb_raise(rb_eTypeError, "'%"PRIsVALUE"' is not a singleton class", klass);
+    }
+
+    return RCLASS_ATTACHED_OBJECT(klass);
+}
+
 static void
 ins_methods_push(st_data_t name, st_data_t ary)
 {
@@ -1603,10 +2339,10 @@ ins_methods_i(st_data_t name, st_data_t type, st_data_t ary)
     switch ((rb_method_visibility_t)type) {
       case METHOD_VISI_UNDEF:
       case METHOD_VISI_PRIVATE:
-	break;
+        break;
       default: /* everything but private */
-	ins_methods_push(name, ary);
-	break;
+        ins_methods_push(name, ary);
+        break;
     }
     return ST_CONTINUE;
 }
@@ -1615,7 +2351,7 @@ static int
 ins_methods_type_i(st_data_t name, st_data_t type, st_data_t ary, rb_method_visibility_t visi)
 {
     if ((rb_method_visibility_t)type == visi) {
-	ins_methods_push(name, ary);
+        ins_methods_push(name, ary);
     }
     return ST_CONTINUE;
 }
@@ -1638,6 +2374,12 @@ ins_methods_pub_i(st_data_t name, st_data_t type, st_data_t ary)
     return ins_methods_type_i(name, type, ary, METHOD_VISI_PUBLIC);
 }
 
+static int
+ins_methods_undef_i(st_data_t name, st_data_t type, st_data_t ary)
+{
+    return ins_methods_type_i(name, type, ary, METHOD_VISI_UNDEF);
+}
+
 struct method_entry_arg {
     st_table *list;
     int recur;
@@ -1651,20 +2393,20 @@ method_entry_i(ID key, VALUE value, void *data)
     rb_method_visibility_t type;
 
     if (me->def->type == VM_METHOD_TYPE_REFINED) {
-	VALUE owner = me->owner;
-	me = rb_resolve_refined_method(Qnil, me);
-	if (!me) return ID_TABLE_CONTINUE;
-	if (!arg->recur && me->owner != owner) return ID_TABLE_CONTINUE;
+        VALUE owner = me->owner;
+        me = rb_resolve_refined_method(Qnil, me);
+        if (!me) return ID_TABLE_CONTINUE;
+        if (!arg->recur && me->owner != owner) return ID_TABLE_CONTINUE;
     }
     if (!st_is_member(arg->list, key)) {
-	if (UNDEFINED_METHOD_ENTRY_P(me)) {
-	    type = METHOD_VISI_UNDEF; /* none */
-	}
-	else {
-	    type = METHOD_ENTRY_VISI(me);
-	    RUBY_ASSERT(type != METHOD_VISI_UNDEF);
-	}
-	st_add_direct(arg->list, key, (st_data_t)type);
+        if (UNDEFINED_METHOD_ENTRY_P(me)) {
+            type = METHOD_VISI_UNDEF; /* none */
+        }
+        else {
+            type = METHOD_ENTRY_VISI(me);
+            RUBY_ASSERT(type != METHOD_VISI_UNDEF);
+        }
+        st_add_direct(arg->list, key, (st_data_t)type);
     }
     return ID_TABLE_CONTINUE;
 }
@@ -1681,7 +2423,7 @@ static bool
 particular_class_p(VALUE mod)
 {
     if (!mod) return false;
-    if (FL_TEST(mod, FL_SINGLETON)) return true;
+    if (RCLASS_SINGLETON_P(mod)) return true;
     if (BUILTIN_TYPE(mod) == T_ICLASS) return true;
     return false;
 }
@@ -1705,14 +2447,14 @@ class_instance_method_list(int argc, const VALUE *argv, VALUE mod, int obj, int
     }
 
     if (!recur && RCLASS_ORIGIN(mod) != mod) {
-	mod = RCLASS_ORIGIN(mod);
-	prepended = 1;
+        mod = RCLASS_ORIGIN(mod);
+        prepended = 1;
     }
 
     for (; mod; mod = RCLASS_SUPER(mod)) {
         add_instance_method_list(mod, &me_arg);
-	if (BUILTIN_TYPE(mod) == T_ICLASS && !prepended) continue;
-	if (!recur) break;
+        if (BUILTIN_TYPE(mod) == T_ICLASS && !prepended) continue;
+        if (!recur) break;
     }
     ary = rb_ary_new2(me_arg.list->num_entries);
     st_foreach(me_arg.list, func, ary);
@@ -1746,6 +2488,15 @@ class_instance_method_list(int argc, const VALUE *argv, VALUE mod, int obj, int
  *     B.instance_methods(true).include?(:method1) #=> true
  *     C.instance_methods(false)                   #=> [:method3]
  *     C.instance_methods.include?(:method2)       #=> true
+ *
+ *  Note that method visibility changes in the current class, as well as aliases,
+ *  are considered as methods of the current class by this method:
+ *
+ *     class C < B
+ *       alias method4 method2
+ *       protected :method2
+ *     end
+ *     C.instance_methods(false).sort               #=> [:method2, :method3, :method4]
  */
 
 VALUE
@@ -1809,6 +2560,21 @@ rb_class_public_instance_methods(int argc, const VALUE *argv, VALUE mod)
 
 /*
  *  call-seq:
+ *     mod.undefined_instance_methods   -> array
+ *
+ *  Returns a list of the undefined instance methods defined in <i>mod</i>.
+ *  The undefined methods of any ancestors are not included.
+ */
+
+VALUE
+rb_class_undefined_instance_methods(VALUE mod)
+{
+    VALUE include_super = Qfalse;
+    return class_instance_method_list(1, &include_super, mod, 0, ins_methods_undef_i);
+}
+
+/*
+ *  call-seq:
  *     obj.methods(regular=true)    -> array
  *
  *  Returns a list of the names of public and protected methods of
@@ -1842,7 +2608,7 @@ rb_obj_methods(int argc, const VALUE *argv, VALUE obj)
 {
     rb_check_arity(argc, 0, 1);
     if (argc > 0 && !RTEST(argv[0])) {
-	return rb_obj_singleton_methods(argc, argv, obj);
+        return rb_obj_singleton_methods(argc, argv, obj);
     }
     return class_instance_method_list(argc, argv, CLASS_OF(obj), 1, ins_methods_i);
 }
@@ -1934,22 +2700,22 @@ rb_obj_singleton_methods(int argc, const VALUE *argv, VALUE obj)
     int recur = TRUE;
 
     if (rb_check_arity(argc, 0, 1)) recur = RTEST(argv[0]);
-    if (RB_TYPE_P(obj, T_CLASS) && FL_TEST(obj, FL_SINGLETON)) {
+    if (RCLASS_SINGLETON_P(obj)) {
         rb_singleton_class(obj);
     }
     klass = CLASS_OF(obj);
     origin = RCLASS_ORIGIN(klass);
     me_arg.list = st_init_numtable();
     me_arg.recur = recur;
-    if (klass && FL_TEST(klass, FL_SINGLETON)) {
-	if ((mtbl = RCLASS_M_TBL(origin)) != 0) rb_id_table_foreach(mtbl, method_entry_i, &me_arg);
-	klass = RCLASS_SUPER(klass);
+    if (klass && RCLASS_SINGLETON_P(klass)) {
+        if ((mtbl = RCLASS_M_TBL(origin)) != 0) rb_id_table_foreach(mtbl, method_entry_i, &me_arg);
+        klass = RCLASS_SUPER(klass);
     }
     if (recur) {
-	while (klass && (FL_TEST(klass, FL_SINGLETON) || RB_TYPE_P(klass, T_ICLASS))) {
-	    if (klass != origin && (mtbl = RCLASS_M_TBL(klass)) != 0) rb_id_table_foreach(mtbl, method_entry_i, &me_arg);
-	    klass = RCLASS_SUPER(klass);
-	}
+        while (klass && (RCLASS_SINGLETON_P(klass) || RB_TYPE_P(klass, T_ICLASS))) {
+            if (klass != origin && (mtbl = RCLASS_M_TBL(klass)) != 0) rb_id_table_foreach(mtbl, method_entry_i, &me_arg);
+            klass = RCLASS_SUPER(klass);
+        }
     }
     ary = rb_ary_new2(me_arg.list->num_entries);
     st_foreach(me_arg.list, ins_methods_i, ary);
@@ -2021,7 +2787,7 @@ rb_undef_methods_from(VALUE klass, VALUE super)
 {
     struct rb_id_table *mtbl = RCLASS_M_TBL(super);
     if (mtbl) {
-	rb_id_table_foreach(mtbl, undef_method_i, (void *)klass);
+        rb_id_table_foreach(mtbl, undef_method_i, (void *)klass);
     }
 }
 
@@ -2050,17 +2816,17 @@ rb_special_singleton_class(VALUE obj)
     return special_singleton_class_of(obj);
 }
 
-/*!
- * \internal
- * Returns the singleton class of \a obj. Creates it if necessary.
+/**
+ * @internal
+ * Returns the singleton class of `obj`. Creates it if necessary.
  *
- * \note DO NOT expose the returned singleton class to
+ * @note DO NOT expose the returned singleton class to
  *       outside of class.c.
- *       Use \ref rb_singleton_class instead for
+ *       Use @ref rb_singleton_class instead for
  *       consistency of the metaclass hierarchy.
  */
 static VALUE
-singleton_class_of(VALUE obj)
+singleton_class_of(VALUE obj, bool ensure_eigenclass)
 {
     VALUE klass;
 
@@ -2069,31 +2835,45 @@ singleton_class_of(VALUE obj)
       case T_BIGNUM:
       case T_FLOAT:
       case T_SYMBOL:
-	rb_raise(rb_eTypeError, "can't define singleton");
+        rb_raise(rb_eTypeError, "can't define singleton");
 
       case T_FALSE:
       case T_TRUE:
       case T_NIL:
-	klass = special_singleton_class_of(obj);
-	if (NIL_P(klass))
-	    rb_bug("unknown immediate %p", (void *)obj);
-	return klass;
+        klass = special_singleton_class_of(obj);
+        if (NIL_P(klass))
+            rb_bug("unknown immediate %p", (void *)obj);
+        return klass;
 
       case T_STRING:
-        if (FL_TEST_RAW(obj, RSTRING_FSTR)) {
+        if (CHILLED_STRING_P(obj)) {
+            CHILLED_STRING_MUTATED(obj);
+        }
+        else if (FL_TEST_RAW(obj, RSTRING_FSTR)) {
             rb_raise(rb_eTypeError, "can't define singleton");
         }
     }
 
-    klass = METACLASS_OF(obj);
-    if (!(FL_TEST(klass, FL_SINGLETON) &&
-          rb_attr_get(klass, id_attached) == obj)) {
-	rb_serial_t serial = RCLASS_SERIAL(klass);
-	klass = rb_make_metaclass(obj, klass);
-	RCLASS_SERIAL(klass) = serial;
+    bool needs_lock = rb_multi_ractor_p() && rb_ractor_shareable_p(obj);
+    unsigned int lev;
+    if (needs_lock) {
+        RB_VM_LOCK_ENTER_LEV(&lev);
+    }
+    {
+        klass = METACLASS_OF(obj);
+        if (!(RCLASS_SINGLETON_P(klass) &&
+            RCLASS_ATTACHED_OBJECT(klass) == obj)) {
+            klass = rb_make_metaclass(obj, klass);
+        }
+        RB_FL_SET_RAW(klass, RB_OBJ_FROZEN_RAW(obj));
+        if (ensure_eigenclass && RB_TYPE_P(obj, T_CLASS)) {
+            /* ensures an exposed class belongs to its own eigenclass */
+            (void)ENSURE_EIGENCLASS(klass);
+        }
+    }
+    if (needs_lock) {
+        RB_VM_LOCK_LEAVE_LEV(&lev);
     }
-
-    RB_FL_SET_RAW(klass, RB_OBJ_FROZEN_RAW(obj));
 
     return klass;
 }
@@ -2102,21 +2882,22 @@ void
 rb_freeze_singleton_class(VALUE x)
 {
     /* should not propagate to meta-meta-class, and so on */
-    if (!(RBASIC(x)->flags & FL_SINGLETON)) {
-	VALUE klass = RBASIC_CLASS(x);
-	if (klass && (klass = RCLASS_ORIGIN(klass)) != 0 &&
-	    FL_TEST(klass, (FL_SINGLETON|FL_FREEZE)) == FL_SINGLETON) {
-	    OBJ_FREEZE_RAW(klass);
-	}
+    if (!RCLASS_SINGLETON_P(x)) {
+        VALUE klass = RBASIC_CLASS(x);
+        if (klass && // no class when hidden from ObjectSpace
+            FL_TEST_RAW(klass, FL_SINGLETON) &&
+            !OBJ_FROZEN_RAW(klass)) {
+            OBJ_FREEZE(klass);
+        }
     }
 }
 
-/*!
- * Returns the singleton class of \a obj, or nil if obj is not a
+/**
+ * Returns the singleton class of `obj`, or nil if obj is not a
  * singleton object.
  *
- * \param obj an arbitrary object.
- * \return the singleton class or nil.
+ * @param obj an arbitrary object.
+ * @return the singleton class or nil.
  */
 VALUE
 rb_singleton_class_get(VALUE obj)
@@ -2124,23 +2905,18 @@ rb_singleton_class_get(VALUE obj)
     VALUE klass;
 
     if (SPECIAL_CONST_P(obj)) {
-	return rb_special_singleton_class(obj);
+        return rb_special_singleton_class(obj);
     }
     klass = METACLASS_OF(obj);
-    if (!FL_TEST(klass, FL_SINGLETON)) return Qnil;
-    if (rb_attr_get(klass, id_attached) != obj) return Qnil;
+    if (!RCLASS_SINGLETON_P(klass)) return Qnil;
+    if (RCLASS_ATTACHED_OBJECT(klass) != obj) return Qnil;
     return klass;
 }
 
 VALUE
 rb_singleton_class(VALUE obj)
 {
-    VALUE klass = singleton_class_of(obj);
-
-    /* ensures an exposed class belongs to its own eigenclass */
-    if (RB_TYPE_P(obj, T_CLASS)) (void)ENSURE_EIGENCLASS(klass);
-
-    return klass;
+    return singleton_class_of(obj, true);
 }
 
 /*!
@@ -2158,7 +2934,7 @@ rb_singleton_class(VALUE obj)
 void
 rb_define_singleton_method(VALUE obj, const char *name, VALUE (*func)(ANYARGS), int argc)
 {
-    rb_define_method(singleton_class_of(obj), name, func, argc);
+    rb_define_method(singleton_class_of(obj, false), name, func, argc);
 }
 
 #ifdef rb_define_module_function
@@ -2192,20 +2968,20 @@ rb_define_attr(VALUE klass, const char *name, int read, int write)
     rb_attr(klass, rb_intern(name), read, write, FALSE);
 }
 
-MJIT_FUNC_EXPORTED VALUE
+VALUE
 rb_keyword_error_new(const char *error, VALUE keys)
 {
     long i = 0, len = RARRAY_LEN(keys);
     VALUE error_message = rb_sprintf("%s keyword%.*s", error, len > 1, "s");
 
     if (len > 0) {
-	rb_str_cat_cstr(error_message, ": ");
-	while (1) {
+        rb_str_cat_cstr(error_message, ": ");
+        while (1) {
             const VALUE k = RARRAY_AREF(keys, i);
-	    rb_str_append(error_message, rb_inspect(k));
-	    if (++i >= len) break;
-	    rb_str_cat_cstr(error_message, ", ");
-	}
+            rb_str_append(error_message, rb_inspect(k));
+            if (++i >= len) break;
+            rb_str_cat_cstr(error_message, ", ");
+        }
     }
 
     return rb_exc_new_str(rb_eArgError, error_message);
@@ -2224,7 +3000,7 @@ unknown_keyword_error(VALUE hash, const ID *table, int keywords)
 {
     int i;
     for (i = 0; i < keywords; i++) {
-	st_data_t key = ID2SYM(table[i]);
+        st_data_t key = ID2SYM(table[i]);
         rb_hash_stlike_delete(hash, &key, NULL);
     }
     rb_keyword_error("unknown", rb_hash_keys(hash));
@@ -2248,8 +3024,8 @@ rb_extract_keywords(VALUE *orighash)
     VALUE hash = *orighash;
 
     if (RHASH_EMPTY_P(hash)) {
-	*orighash = 0;
-	return hash;
+        *orighash = 0;
+        return hash;
     }
     rb_hash_foreach(hash, separate_symbol, (st_data_t)&parthash);
     *orighash = parthash[1];
@@ -2275,36 +3051,36 @@ rb_get_kwargs(VALUE keyword_hash, const ID *table, int required, int optional, V
     if (NIL_P(keyword_hash)) keyword_hash = 0;
 
     if (optional < 0) {
-	rest = 1;
-	optional = -1-optional;
+        rest = 1;
+        optional = -1-optional;
     }
     if (required) {
-	for (; i < required; i++) {
-	    VALUE keyword = ID2SYM(table[i]);
-	    if (keyword_hash) {
+        for (; i < required; i++) {
+            VALUE keyword = ID2SYM(table[i]);
+            if (keyword_hash) {
                 if (extract_kwarg(keyword, values[i])) {
-		    continue;
-		}
-	    }
-	    if (NIL_P(missing)) missing = rb_ary_tmp_new(1);
-	    rb_ary_push(missing, keyword);
-	}
-	if (!NIL_P(missing)) {
-	    rb_keyword_error("missing", missing);
-	}
+                    continue;
+                }
+            }
+            if (NIL_P(missing)) missing = rb_ary_hidden_new(1);
+            rb_ary_push(missing, keyword);
+        }
+        if (!NIL_P(missing)) {
+            rb_keyword_error("missing", missing);
+        }
     }
     j = i;
     if (optional && keyword_hash) {
-	for (i = 0; i < optional; i++) {
+        for (i = 0; i < optional; i++) {
             if (extract_kwarg(ID2SYM(table[required+i]), values[required+i])) {
-		j++;
-	    }
-	}
+                j++;
+            }
+        }
     }
     if (!rest && keyword_hash) {
-	if (RHASH_SIZE(keyword_hash) > (unsigned int)(values ? 0 : j)) {
-	    unknown_keyword_error(keyword_hash, table, required+optional);
-	}
+        if (RHASH_SIZE(keyword_hash) > (unsigned int)(values ? 0 : j)) {
+            unknown_keyword_error(keyword_hash, table, required+optional);
+        }
     }
     if (values && !keyword_hash) {
         for (i = 0; i < required + optional; i++) {
@@ -2335,30 +3111,30 @@ rb_scan_args_parse(int kw_flag, const char *fmt, struct rb_scan_args_t *arg)
 
     if (ISDIGIT(*p)) {
         arg->n_lead = *p - '0';
-	p++;
-	if (ISDIGIT(*p)) {
+        p++;
+        if (ISDIGIT(*p)) {
             arg->n_opt = *p - '0';
-	    p++;
-	}
+            p++;
+        }
     }
     if (*p == '*') {
         arg->f_var = 1;
-	p++;
+        p++;
     }
     if (ISDIGIT(*p)) {
         arg->n_trail = *p - '0';
-	p++;
+        p++;
     }
     if (*p == ':') {
         arg->f_hash = 1;
-	p++;
+        p++;
     }
     if (*p == '&') {
         arg->f_block = 1;
-	p++;
+        p++;
     }
     if (*p != '\0') {
-	rb_fatal("bad scan arg format: %s", fmt);
+        rb_fatal("bad scan arg format: %s", fmt);
     }
 }
 
@@ -2394,37 +3170,37 @@ rb_scan_args_assign(const struct rb_scan_args_t *arg, int argc, const VALUE *con
     for (i = 0; i < n_lead; i++) {
         var = rb_scan_args_next_param();
         if (var) *var = argv[argi];
-	argi++;
+        argi++;
     }
     /* capture optional arguments */
     for (i = 0; i < n_opt; i++) {
         var = rb_scan_args_next_param();
         if (argi < argc - n_trail) {
             if (var) *var = argv[argi];
-	    argi++;
-	}
-	else {
-	    if (var) *var = Qnil;
-	}
+            argi++;
+        }
+        else {
+            if (var) *var = Qnil;
+        }
     }
     /* capture variable length arguments */
     if (f_var) {
         int n_var = argc - argi - n_trail;
 
         var = rb_scan_args_next_param();
-	if (0 < n_var) {
+        if (0 < n_var) {
             if (var) *var = rb_ary_new_from_values(n_var, &argv[argi]);
-	    argi += n_var;
-	}
-	else {
-	    if (var) *var = rb_ary_new();
-	}
+            argi += n_var;
+        }
+        else {
+            if (var) *var = rb_ary_new();
+        }
     }
     /* capture trailing mandatory arguments */
     for (i = 0; i < n_trail; i++) {
         var = rb_scan_args_next_param();
         if (var) *var = argv[argi];
-	argi++;
+        argi++;
     }
     /* capture an option hash - phase 2: assignment */
     if (f_hash) {
@@ -2434,12 +3210,12 @@ rb_scan_args_assign(const struct rb_scan_args_t *arg, int argc, const VALUE *con
     /* capture iterator block */
     if (f_block) {
         var = rb_scan_args_next_param();
-	if (rb_block_given_p()) {
-	    *var = rb_block_proc();
-	}
-	else {
-	    *var = Qnil;
-	}
+        if (rb_block_given_p()) {
+            *var = rb_block_proc();
+        }
+        else {
+            *var = Qnil;
+        }
     }
 
     if (argi == argc) {
diff --git a/common.mk b/common.mk
index 905bb929c9..8891b65ed9 100644
--- a/common.mk
+++ b/common.mk
@@ -1,10 +1,12 @@
 # -*- mode: makefile-gmake; indent-tabs-mode: t -*-
+# This fragment can be used with nmake.exe and with bsdmake.
+# Avoid features specific to GNU Make.
 
 bin: $(PROGRAM) $(WPROGRAM)
 lib: $(LIBRUBY)
 dll: $(LIBRUBY_SO)
 
-.SUFFIXES: .rbinc .rb .inc .h .c .y .i .$(ASMEXT) .$(DTRACE_EXT)
+.SUFFIXES: .rbinc .rbbin .rb .inc .h .c .y .i .$(ASMEXT) .$(DTRACE_EXT)
 
 # V=0 quiet, V=1 verbose.  other values don't work.
 V = 0
@@ -16,10 +18,13 @@ ECHO = @$(ECHO0)
 
 mflags = $(MFLAGS)
 gnumake_recursive =
+sequential = $(gnumake:yes=-sequential)
 enable_shared = $(ENABLE_SHARED:no=)
 
-UNICODE_VERSION = 14.0.0
-UNICODE_EMOJI_VERSION = 14.0
+UNICODE_VERSION = 17.0.0
+UNICODE_EMOJI_VERSION_0 = $(UNICODE_VERSION)///
+UNICODE_EMOJI_VERSION_1 = $(UNICODE_EMOJI_VERSION_0:.0///=)
+UNICODE_EMOJI_VERSION = $(UNICODE_EMOJI_VERSION_1:///=)
 UNICODE_BETA = NO
 
 ### set the following environment variable or uncomment the line if
@@ -39,22 +44,21 @@ RUBYLIB       = $(PATH_SEPARATOR)
 RUBYOPT       = -
 RUN_OPTS      = --disable-gems
 
+GIT_IN_SRC    = $(GIT) -C $(srcdir)
+GIT_LOG       = $(GIT_IN_SRC) log --no-show-signature
+GIT_LOG_FORMAT = $(GIT_LOG) "--pretty=format:"
+
 # GITPULLOPTIONS = --no-tags
 
-INCFLAGS = -I. -I$(arch_hdrdir) -I$(hdrdir) -I$(srcdir) -I$(UNICODE_HDR_DIR)
+PRISM_SRCDIR = $(srcdir)/prism
+INCFLAGS = -I. -I$(arch_hdrdir) -I$(ext_hdrdir) -I$(hdrdir) -I$(srcdir) -I$(PRISM_SRCDIR) -I$(UNICODE_HDR_DIR) $(incflags)
 
 GEM_HOME =
 GEM_PATH =
 GEM_VENDOR =
 
 BENCHMARK_DRIVER_GIT_URL = https://github.com/benchmark-driver/benchmark-driver
-BENCHMARK_DRIVER_GIT_REF = v0.15.17
-SIMPLECOV_GIT_URL = https://github.com/colszowka/simplecov.git
-SIMPLECOV_GIT_REF = v0.17.0
-SIMPLECOV_HTML_GIT_URL = https://github.com/colszowka/simplecov-html.git
-SIMPLECOV_HTML_GIT_REF = v0.10.2
-DOCLIE_GIT_URL = https://github.com/ms-ati/docile.git
-DOCLIE_GIT_REF = v1.3.2
+BENCHMARK_DRIVER_GIT_REF = v0.16.3
 
 STATIC_RUBY   = static-ruby
 
@@ -65,32 +69,62 @@ LIBRUBY_EXTS  = ./.libruby-with-ext.time
 REVISION_H    = ./.revision.time
 PLATFORM_D    = $(TIMESTAMPDIR)/.$(PLATFORM_DIR).time
 ENC_TRANS_D   = $(TIMESTAMPDIR)/.enc-trans.time
-RDOC          = $(XRUBY) "$(srcdir)/libexec/rdoc" --root "$(srcdir)" --encoding=UTF-8 --all
+RDOC          = $(XRUBY) "$(tooldir)/rdoc-srcdir"
 RDOCOUT       = $(EXTOUT)/rdoc
 HTMLOUT       = $(EXTOUT)/html
 CAPIOUT       = doc/capi
 INSTALL_DOC_OPTS = --rdoc-output="$(RDOCOUT)" --html-output="$(HTMLOUT)"
-RDOC_GEN_OPTS = --page-dir "$(srcdir)/doc" --no-force-update \
-	--title "Documentation for Ruby $(RUBY_API_VERSION)" \
-	--main README.md
+RDOC_GEN_OPTS = --no-force-update \
+	$(empty)
 
 INITOBJS      = dmyext.$(OBJEXT) dmyenc.$(OBJEXT)
 NORMALMAINOBJ = main.$(OBJEXT)
 MAINOBJ       = $(NORMALMAINOBJ)
 DLDOBJS	      = $(INITOBJS)
 EXTSOLIBS     =
-MINIOBJS      = $(ARCHMINIOBJS) miniinit.$(OBJEXT) dmyext.$(OBJEXT)
+MINIOBJS      = $(ARCHMINIOBJS) miniinit.$(OBJEXT)
 ENC_MK        = enc.mk
 MAKE_ENC      = -f $(ENC_MK) V="$(V)" UNICODE_HDR_DIR="$(UNICODE_HDR_DIR)" \
-		RUBY="$(MINIRUBY)" MINIRUBY="$(MINIRUBY)" $(mflags)
-
-COMMONOBJS    = array.$(OBJEXT) \
+		RUBY="$(BOOTSTRAPRUBY)" MINIRUBY="$(BOOTSTRAPRUBY)" $(mflags)
+
+PRISM_BUILD_DIR = prism
+
+PRISM_FILES = prism/api_node.$(OBJEXT) \
+		prism/api_pack.$(OBJEXT) \
+		prism/diagnostic.$(OBJEXT) \
+		prism/encoding.$(OBJEXT) \
+		prism/extension.$(OBJEXT) \
+		prism/node.$(OBJEXT) \
+		prism/options.$(OBJEXT) \
+		prism/pack.$(OBJEXT) \
+		prism/prettyprint.$(OBJEXT) \
+		prism/regexp.$(OBJEXT) \
+		prism/serialize.$(OBJEXT) \
+		prism/static_literals.$(OBJEXT) \
+		prism/token_type.$(OBJEXT) \
+		prism/util/pm_buffer.$(OBJEXT) \
+		prism/util/pm_char.$(OBJEXT) \
+		prism/util/pm_constant_pool.$(OBJEXT) \
+		prism/util/pm_integer.$(OBJEXT) \
+		prism/util/pm_list.$(OBJEXT) \
+		prism/util/pm_memchr.$(OBJEXT) \
+		prism/util/pm_newline_list.$(OBJEXT) \
+		prism/util/pm_string.$(OBJEXT) \
+		prism/util/pm_strncasecmp.$(OBJEXT) \
+		prism/util/pm_strpbrk.$(OBJEXT) \
+		prism/prism.$(OBJEXT) \
+		prism_init.$(OBJEXT)
+
+COMMONOBJS    = \
+		array.$(OBJEXT) \
 		ast.$(OBJEXT) \
 		bignum.$(OBJEXT) \
+		box.$(OBJEXT) \
 		class.$(OBJEXT) \
 		compar.$(OBJEXT) \
 		compile.$(OBJEXT) \
 		complex.$(OBJEXT) \
+		concurrent_set.$(OBJEXT) \
 		cont.$(OBJEXT) \
 		debug.$(OBJEXT) \
 		debug_counter.$(OBJEXT) \
@@ -104,6 +138,7 @@ COMMONOBJS    = array.$(OBJEXT) \
 		file.$(OBJEXT) \
 		gc.$(OBJEXT) \
 		hash.$(OBJEXT) \
+		imemo.$(OBJEXT) \
 		inits.$(OBJEXT) \
 		io.$(OBJEXT) \
 		io_buffer.$(OBJEXT) \
@@ -112,13 +147,14 @@ COMMONOBJS    = array.$(OBJEXT) \
 		marshal.$(OBJEXT) \
 		math.$(OBJEXT) \
 		memory_view.$(OBJEXT) \
-		mjit.$(OBJEXT) \
-		mjit_compile.$(OBJEXT) \
 		node.$(OBJEXT) \
+		node_dump.$(OBJEXT) \
 		numeric.$(OBJEXT) \
 		object.$(OBJEXT) \
 		pack.$(OBJEXT) \
+		pathname.$(OBJEXT) \
 		parse.$(OBJEXT) \
+		parser_st.$(OBJEXT) \
 		proc.$(OBJEXT) \
 		process.$(OBJEXT) \
 		ractor.$(OBJEXT) \
@@ -133,7 +169,10 @@ COMMONOBJS    = array.$(OBJEXT) \
 		regparse.$(OBJEXT) \
 		regsyntax.$(OBJEXT) \
 		ruby.$(OBJEXT) \
+		ruby_parser.$(OBJEXT) \
 		scheduler.$(OBJEXT) \
+		set.$(OBJEXT) \
+		shape.$(OBJEXT) \
 		signal.$(OBJEXT) \
 		sprintf.$(OBJEXT) \
 		st.$(OBJEXT) \
@@ -144,7 +183,6 @@ COMMONOBJS    = array.$(OBJEXT) \
 		thread.$(OBJEXT) \
 		time.$(OBJEXT) \
 		transcode.$(OBJEXT) \
-		transient_heap.$(OBJEXT) \
 		util.$(OBJEXT) \
 		variable.$(OBJEXT) \
 		version.$(OBJEXT) \
@@ -153,20 +191,31 @@ COMMONOBJS    = array.$(OBJEXT) \
 		vm_dump.$(OBJEXT) \
 		vm_sync.$(OBJEXT) \
 		vm_trace.$(OBJEXT) \
+		weakmap.$(OBJEXT) \
+		$(PRISM_FILES) \
 		$(YJIT_OBJ) \
+		$(ZJIT_OBJ) \
+		$(JIT_OBJ) \
+		$(RUST_LIBOBJ) \
 		$(COROUTINE_OBJ) \
 		$(DTRACE_OBJ) \
 		$(BUILTIN_ENCOBJS) \
 		$(BUILTIN_TRANSOBJS) \
 		$(MISSING)
 
+$(PRISM_FILES): $(PRISM_BUILD_DIR)/.time $(PRISM_BUILD_DIR)/util/.time
+
+$(PRISM_BUILD_DIR)/.time $(PRISM_BUILD_DIR)/util/.time:
+	$(Q) $(MAKEDIRS) $(@D)
+	@$(NULLCMD) > $@
+
 EXPORTOBJS    = $(DLNOBJ) \
 		localeinit.$(OBJEXT) \
 		loadpath.$(OBJEXT) \
 		$(COMMONOBJS)
 
 OBJS          = $(EXPORTOBJS) builtin.$(OBJEXT)
-ALLOBJS       = $(NORMALMAINOBJ) $(MINIOBJS) $(COMMONOBJS) $(INITOBJS)
+ALLOBJS       = $(OBJS) $(MINIOBJS) $(INITOBJS) $(MAINOBJ)
 
 GOLFOBJS      = goruby.$(OBJEXT)
 
@@ -174,7 +223,7 @@ DEFAULT_PRELUDES = $(GEM_PRELUDE)
 PRELUDE_SCRIPTS = $(DEFAULT_PRELUDES)
 GEM_PRELUDE   =
 PRELUDES      = {$(srcdir)}miniprelude.c
-GOLFPRELUDES  = {$(srcdir)}golf_prelude.c
+GOLFPRELUDES  = golf_prelude.rbbin
 
 SCRIPT_ARGS   =	--dest-dir="$(DESTDIR)" \
 		--extout="$(EXTOUT)" \
@@ -195,9 +244,10 @@ INSTRUBY_ARGS =	$(SCRIPT_ARGS) \
 INSTALL_PROG_MODE = 0755
 INSTALL_DATA_MODE = 0644
 
+BOOTSTRAPRUBY_COMMAND = $(BOOTSTRAPRUBY) $(BOOTSTRAPRUBY_OPT)
 TESTSDIR      = $(srcdir)/test
 TOOL_TESTSDIR = $(tooldir)/test
-TEST_EXCLUDES = --excludes-dir=$(TESTSDIR)/excludes --name=!/memory_leak/
+TEST_EXCLUDES = --excludes-dir=$(TESTSDIR)/.excludes --name=!/memory_leak/
 TESTWORKDIR   = testwork
 TESTOPTS      = $(RUBY_TESTOPTS)
 
@@ -216,43 +266,26 @@ MAKE_LINK = $(MINIRUBY) -rfileutils -e "include FileUtils::Verbose" \
 	  -e "noraise {ln(src, dest)} or" \
 	  -e "cp(src, dest)"
 
+# For release builds
+YJIT_RUSTC_ARGS = --crate-name=yjit \
+	$(JIT_RUST_FLAGS) \
+	$(RUSTC_FLAGS) \
+	--edition=2021 \
+	'--out-dir=$(CARGO_TARGET_DIR)/release/' \
+	'$(top_srcdir)/yjit/src/lib.rs'
 
-all: $(SHOWFLAGS) main docs
+ZJIT_RUSTC_ARGS = --crate-name=zjit \
+	$(JIT_RUST_FLAGS) \
+	$(RUSTC_FLAGS) \
+	--edition=2024 \
+	'--out-dir=$(CARGO_TARGET_DIR)/release/' \
+	'$(top_srcdir)/zjit/src/lib.rs'
+
+all: $(SHOWFLAGS) main
 
 main: $(SHOWFLAGS) exts $(ENCSTATIC:static=lib)encs
 	@$(NULLCMD)
 
-mjit-headers: $(MJIT_SUPPORT)-mjit-headers
-no-mjit-headers: PHONY
-yes-mjit-headers: mjit_config.h PHONY
-
-mjit.$(OBJEXT): mjit_config.h
-mjit_config.h: Makefile
-
-
-# These rules using MJIT_HEADER_SUFFIX must be in common.mk, not
-# Makefile.in, in order to override the macro in defs/universal.mk.
-
-# Other `-Dxxx`s preceding `-DMJIT_HEADER` will be removed in transform_mjit_header.rb.
-# So `-DMJIT_HEADER` should be passed first when rb_mjit_header.h is generated.
-$(TIMESTAMPDIR)/$(MJIT_HEADER:.h=)$(MJIT_HEADER_SUFFIX).time: probes.h vm.$(OBJEXT) \
-		$(TIMESTAMPDIR)/$(arch)/.time $(tooldir)/mjit_tabs.rb $(PREP) $(RBCONFIG)
-	$(ECHO) building $(@F:.time=.h)
-	$(Q)$(MINIRUBY) $(tooldir)/mjit_tabs.rb "$(MJIT_TABS)" \
-		$(CPP) -DMJIT_HEADER $(MJIT_HEADER_FLAGS) $(CFLAGS) $(XCFLAGS) $(CPPFLAGS) $(srcdir)/vm.c $(CPPOUTFLAG)$(@F:.time=.h).new
-	$(Q) $(IFCHANGE) "--timestamp=$@" $(@F:.time=.h) $(@F:.time=.h).new
-
-$(MJIT_HEADER:.h=)$(MJIT_HEADER_SUFFIX).h: $(TIMESTAMPDIR)/$(MJIT_HEADER:.h=)$(MJIT_HEADER_SUFFIX).time
-
-$(MJIT_MIN_HEADER:.h=)$(MJIT_HEADER_SUFFIX).h: \
-		$(TIMESTAMPDIR)/$(MJIT_HEADER:.h=)$(MJIT_HEADER_SUFFIX).time \
-		$(tooldir)/transform_mjit_header.rb $(PREP) \
-		$(MJIT_HEADER:.h=)$(MJIT_HEADER_SUFFIX).h
-	$(ECHO) building $@
-	$(Q)$(MINIRUBY) $(tooldir)/transform_mjit_header.rb "$(CC) $(CFLAGS) -w" $(MJIT_HEADER:.h=)$(MJIT_HEADER_ARCH).h $@
-	$(Q) $(MAKEDIRS) $(MJIT_HEADER_INSTALL_DIR)
-	$(Q) $(MAKE_LINK) $@ $(MJIT_HEADER_INSTALL_DIR)/$(@F)
-
 .PHONY: showflags
 exts enc trans: $(SHOWFLAGS)
 showflags:
@@ -270,6 +303,9 @@ showflags:
 	"	LC_ALL = $(LC_ALL)" \
 	"	LC_CTYPE = $(LC_CTYPE)" \
 	"	MFLAGS = $(MFLAGS)" \
+	"	RUSTC = $(RUSTC)" \
+	"	YJIT_RUSTC_ARGS = $(YJIT_RUSTC_ARGS)" \
+	"	ZJIT_RUSTC_ARGS = $(ZJIT_RUSTC_ARGS)" \
 	$(MESSAGE_END)
 	-@$(CC_VERSION)
 
@@ -305,7 +341,8 @@ configure-ext: $(EXTS_MK)
 
 build-ext: $(EXTS_MK)
 	$(Q)$(MAKE) -f $(EXTS_MK) $(mflags) libdir="$(libdir)" LIBRUBY_EXTS=$(LIBRUBY_EXTS) \
-	    EXTENCS="$(ENCOBJS)" MINIRUBY="$(MINIRUBY)" UPDATE_LIBRARIES=no $(EXTSTATIC)
+	    EXTENCS="$(ENCOBJS)" BASERUBY="$(BASERUBY)" MINIRUBY="$(MINIRUBY)" \
+	    $(EXTSTATIC)
 	$(Q)$(MAKE) $(EXTS_NOTE)
 
 exts-note: $(EXTS_MK)
@@ -321,7 +358,7 @@ programs: $(PROGRAM) $(WPROGRAM) $(arch)-fake.rb
 
 $(PREP): $(MKFILES)
 
-miniruby$(EXEEXT): config.status $(ALLOBJS) $(ARCHFILE)
+miniruby$(EXEEXT): config.status $(NORMALMAINOBJ) $(MINIOBJS) $(COMMONOBJS) $(ARCHFILE)
 
 objs: $(ALLOBJS)
 
@@ -348,8 +385,8 @@ Doxyfile: $(srcdir)/template/Doxyfile.tmpl $(PREP) $(tooldir)/generic_erb.rb $(R
 	$(Q) $(MINIRUBY) $(tooldir)/generic_erb.rb -o $@ $(srcdir)/template/Doxyfile.tmpl \
 	--srcdir="$(srcdir)" --miniruby="$(MINIRUBY)"
 
-program: $(SHOWFLAGS) $(PROGRAM)
-wprogram: $(SHOWFLAGS) $(WPROGRAM)
+program: $(SHOWFLAGS) $(DOT_WAIT) $(PROGRAM)
+wprogram: $(SHOWFLAGS) $(DOT_WAIT) $(WPROGRAM)
 mini: PHONY miniruby$(EXEEXT)
 
 $(PROGRAM) $(WPROGRAM): $(LIBRUBY) $(MAINOBJ) $(OBJS) $(EXTOBJS) $(SETUP) $(PREP)
@@ -369,27 +406,27 @@ ruby.imp: $(COMMONOBJS)
 	$(Q){ \
 	$(NM) -Pgp $(COMMONOBJS) | \
 	awk 'BEGIN{print "#!"}; $$2~/^[A-TV-Z]$$/&&$$1!~/^$(SYMBOL_PREFIX)(Init_|InitVM_|ruby_static_id_|.*_threadptr_|rb_ec_)|^\./{print $$1}'; \
-	($(CHDIR) $(srcdir) && \
-	 exec sed -n '/^MJIT_FUNC_EXPORTED/!d;N;s/.*\n\(rb_[a-zA-Z_0-9]*\).*/$(SYMBOL_PREFIX)\1/p' cont.c gc.c thread*c vm*.c) \
 	} | \
 	sort -u -o $@
 
 install: install-$(INSTALLDOC)
-docs: $(DOCTARGETS)
+docs: srcs-doc $(DOCTARGETS)
 pkgconfig-data: $(ruby_pc)
 $(ruby_pc): $(srcdir)/template/ruby.pc.in config.status
 
-install-all: docs pre-install-all do-install-all post-install-all
+INSTALL_ALL = all
+
+install-all: pre-install-all do-install-all post-install-all
 pre-install-all:: all pre-install-local pre-install-ext pre-install-gem pre-install-doc
-do-install-all: pre-install-all
-	$(INSTRUBY) --make="$(MAKE)" $(INSTRUBY_ARGS) --install=all $(INSTALL_DOC_OPTS)
+do-install-all: pre-install-all $(DOT_WAIT) docs
+	$(INSTRUBY) --make="$(MAKE)" $(INSTRUBY_ARGS) --install=$(INSTALL_ALL) $(INSTALL_DOC_OPTS)
 post-install-all:: post-install-local post-install-ext post-install-gem post-install-doc
 	@$(NULLCMD)
 
 install-nodoc: pre-install-nodoc do-install-nodoc post-install-nodoc
 pre-install-nodoc:: pre-install-local pre-install-ext pre-install-gem
 do-install-nodoc: main pre-install-nodoc
-	$(INSTRUBY) --make="$(MAKE)" $(INSTRUBY_ARGS) --install=all --exclude=doc
+	$(INSTRUBY) --make="$(MAKE)" $(INSTRUBY_ARGS) --install=$(INSTALL_ALL) --exclude=doc
 post-install-nodoc:: post-install-local post-install-ext post-install-gem
 
 install-local: pre-install-local do-install-local post-install-local
@@ -464,7 +501,7 @@ what-where-all: no-install-all
 no-install-all: pre-no-install-all dont-install-all post-no-install-all
 pre-no-install-all:: pre-no-install-local pre-no-install-ext pre-no-install-doc
 dont-install-all: $(PROGRAM)
-	$(INSTRUBY) -n --make="$(MAKE)" $(INSTRUBY_ARGS) --install=all $(INSTALL_DOC_OPTS)
+	$(INSTRUBY) -n --make="$(MAKE)" $(INSTRUBY_ARGS) --install=$(INSTALL_ALL) $(INSTALL_DOC_OPTS)
 post-no-install-all:: post-no-install-local post-no-install-ext post-no-install-doc
 	@$(NULLCMD)
 
@@ -569,17 +606,30 @@ do-install-dbg: $(PROGRAM) pre-install-dbg
 post-install-dbg::
 	@$(NULLCMD)
 
-rdoc: PHONY main
+srcs-doc: prepare-gems
+
+rdoc: PHONY main srcs-doc
 	@echo Generating RDoc documentation
-	$(Q) $(RDOC) --ri --op "$(RDOCOUT)" $(RDOC_GEN_OPTS) $(RDOCFLAGS) "$(srcdir)"
+	$(Q) $(RDOC) --ri --op "$(RDOCOUT)" $(RDOC_GEN_OPTS) $(RDOCFLAGS) .
 
-html: PHONY main
+html: PHONY main srcs-doc
 	@echo Generating RDoc HTML files
-	$(Q) $(RDOC) --op "$(HTMLOUT)" $(RDOC_GEN_OPTS) $(RDOCFLAGS) "$(srcdir)"
+	$(Q) $(RDOC) --op "$(HTMLOUT)" $(RDOC_GEN_OPTS) $(RDOCFLAGS) .
+
+RDOC_COVERAGE_EXCLUDES = -x ^ext/json -x ^ext/openssl -x ^ext/psych \
+	-x ^lib/bundler -x ^lib/rubygems \
+	-x ^lib/did_you_mean -x ^lib/error_highlight -x ^lib/syntax_suggest
 
-rdoc-coverage: PHONY main
+rdoc-coverage: PHONY main srcs-doc
 	@echo Generating RDoc coverage report
-	$(Q) $(RDOC) --quiet -C $(RDOCFLAGS) "$(srcdir)"
+	$(Q) $(RDOC) --quiet -C $(RDOCFLAGS) $(RDOC_COVERAGE_EXCLUDES) .
+
+undocumented: PHONY main srcs-doc
+	$(Q) $(RDOC) --quiet -C $(RDOCFLAGS) $(RDOC_COVERAGE_EXCLUDES) . | \
+	sed -n \
+	-e '/^ *# in file /{' -e 's///;N;s/\n/: /p' -e '}' \
+	-e 's/^ *\(.*[^ ]\) *# in file \(.*\)/\2: \1/p' | \
+	sort -t: -k1,1 -k2n,2
 
 RDOCBENCHOUT=/tmp/rdocbench
 
@@ -608,21 +658,27 @@ install-prereq: $(CLEAR_INSTALLED_LIST) yes-fake sudo-precheck PHONY
 clear-installed-list: PHONY
 	@> $(INSTALLED_LIST) set MAKE="$(MAKE)"
 
-clean: clean-ext clean-enc clean-golf clean-docs clean-extout clean-local clean-platform clean-spec
+clean: clean-ext clean-enc clean-golf clean-docs clean-extout clean-modular-gc clean-local clean-platform clean-spec
 clean-local:: clean-runnable
-	$(Q)$(RM) $(OBJS) $(MINIOBJS) $(MAINOBJ) $(LIBRUBY_A) $(LIBRUBY_SO) $(LIBRUBY) $(LIBRUBY_ALIASES)
+	$(Q)$(RM) $(ALLOBJS) $(LIBRUBY_A) $(LIBRUBY_SO) $(LIBRUBY) $(LIBRUBY_ALIASES)
 	$(Q)$(RM) $(PROGRAM) $(WPROGRAM) miniruby$(EXEEXT) dmyext.$(OBJEXT) dmyenc.$(OBJEXT) $(ARCHFILE) .*.time
 	$(Q)$(RM) y.tab.c y.output encdb.h transdb.h config.log rbconfig.rb $(ruby_pc) $(COROUTINE_H:/Context.h=/.time)
 	$(Q)$(RM) probes.h probes.$(OBJEXT) probes.stamp ruby-glommed.$(OBJEXT) ruby.imp ChangeLog $(STATIC_RUBY)$(EXEEXT)
-	$(Q)$(RM) GNUmakefile.old Makefile.old $(arch)-fake.rb bisect.sh $(ENC_TRANS_D) builtin_binary.inc
-	-$(Q) $(RMDIR) enc/jis enc/trans enc $(COROUTINE_H:/Context.h=) coroutine 2> $(NULL) || $(NULLCMD)
+	$(Q)$(RM) GNUmakefile.old Makefile.old $(arch)-fake.rb bisect.sh $(ENC_TRANS_D) builtin_binary.rbbin
+	$(Q)$(RM) $(PRISM_BUILD_DIR)/.time $(PRISM_BUILD_DIR)/*/.time yjit_exit_locations.dump
+	-$(Q)$(RMALL) target
+	-$(Q) $(RMDIR) enc/jis enc/trans enc $(COROUTINE_H:/Context.h=) coroutine target \
+	  $(PRISM_BUILD_DIR)/*/ $(PRISM_BUILD_DIR) tmp \
+	2> $(NULL) || $(NULLCMD)
 
 bin/clean-runnable:: PHONY
 	$(Q)$(CHDIR) bin 2>$(NULL) && $(RM) $(PROGRAM) $(WPROGRAM) $(GORUBY)$(EXEEXT) bin/*.$(DLEXT) 2>$(NULL) || $(NULLCMD)
 lib/clean-runnable:: PHONY
-	$(Q)$(CHDIR) lib 2>$(NULL) && $(RM) $(LIBRUBY_A) $(LIBRUBY) $(LIBRUBY_ALIASES) $(RUBY_BASE_NAME)/$(RUBY_PROGRAM_VERSION) $(RUBY_BASE_NAME)/vendor_ruby 2>$(NULL) || $(NULLCMD)
+	$(Q)$(CHDIR) lib 2>$(NULL) && $(RM) $(LIBRUBY_A) $(LIBRUBY) $(LIBRUBY_ALIASES) $(RUBY_BASE_NAME)/$(ruby_version) $(RUBY_BASE_NAME)/vendor_ruby 2>$(NULL) || $(NULLCMD)
 clean-runnable:: bin/clean-runnable lib/clean-runnable PHONY
 	$(Q)$(RMDIR) lib/$(RUBY_BASE_NAME) lib bin 2>$(NULL) || $(NULLCMD)
+	-$(Q)$(RM) $(EXTOUT)/$(arch)/rbconfig.rb $(EXTOUT)/common/$(arch)
+	-$(Q)$(RMALL) exe/
 clean-ext:: PHONY
 clean-golf: PHONY
 	$(Q)$(RM) $(GORUBY)$(EXEEXT) $(GOLFOBJS)
@@ -636,13 +692,14 @@ clean-docs: clean-rdoc clean-html clean-capi
 clean-spec: PHONY
 clean-rubyspec: clean-spec
 
-distclean: distclean-ext distclean-enc distclean-golf distclean-docs distclean-extout distclean-local distclean-platform distclean-spec
+distclean: distclean-ext distclean-enc distclean-golf distclean-docs distclean-extout distclean-modular-gc distclean-local distclean-platform distclean-spec
 distclean-local:: clean-local
-	$(Q)$(RM) $(MKFILES) yasmdata.rb *.inc $(PRELUDES) *.rbinc
+	$(Q)$(RM) $(MKFILES) *.inc $(PRELUDES) *.rbinc *.rbbin
 	$(Q)$(RM) config.cache config.status config.status.lineno
 	$(Q)$(RM) *~ *.bak *.stackdump core *.core gmon.out $(PREP)
 	-$(Q)$(RMALL) $(srcdir)/autom4te.cache
-distclean-ext:: PHONY
+distclean-local:: distclean-srcs-local
+distclean-ext:: distclean-srcs-ext
 distclean-golf: clean-golf
 distclean-rdoc: clean-rdoc
 distclean-html: clean-html
@@ -657,23 +714,26 @@ realclean:: realclean-ext realclean-local realclean-enc realclean-golf realclean
 realclean-local:: distclean-local realclean-srcs-local
 
 clean-srcs:: clean-srcs-local clean-srcs-ext
+distclean-srcs:: distclean-srcs-local distclean-srcs-ext
 realclean-srcs:: realclean-srcs-local realclean-srcs-ext
 
 clean-srcs-local::
 	$(Q)$(RM) parse.c parse.h lex.c enc/trans/newline.c revision.h
 	$(Q)$(RM) id.c id.h probes.dmyh probes.h
 	$(Q)$(RM) encdb.h transdb.h verconf.h ruby-runner.h
-	$(Q)$(RM) mjit_config.h rb_mjit_header.h
-	$(Q)$(RM) $(MJIT_MIN_HEADER) $(MJIT_MIN_HEADER:.h=)$(MJIT_HEADER_SUFFIX:%=*).h
 
-realclean-srcs-local:: clean-srcs-local
+distclean-srcs-local:: clean-srcs-local
+
+realclean-srcs-local:: distclean-srcs-local
 	$(Q)$(CHDIR) $(srcdir) && $(RM) \
 	  parse.c parse.h lex.c enc/trans/newline.c $(PRELUDES) revision.h \
-	  id.c id.h probes.dmyh configure aclocal.m4 tool/config.guess tool/config.sub gems/*.gem \
+	  id.c id.h probes.dmyh configure aclocal.m4 tool/config.guess tool/config.sub \
+	  $(PRISM_SRCDIR)/srcs.mk gems/*.gem \
 	|| $(NULLCMD)
 
 clean-srcs-ext::
-realclean-srcs-ext:: clean-srcs-ext
+distclean-srcs-ext:: clean-srcs-ext
+realclean-srcs-ext:: distclean-srcs-ext
 
 realclean-ext:: PHONY
 realclean-golf: distclean-golf
@@ -687,18 +747,18 @@ realclean-platform: distclean-platform
 realclean-spec: distclean-spec
 realclean-rubyspec: realclean-spec
 
-clean-ext:: ext/clean gems/clean timestamp/clean
-distclean-ext:: ext/distclean gems/distclean timestamp/distclean
-realclean-ext:: ext/realclean gems/realclean timestamp/realclean
+clean-ext:: ext/clean .bundle/clean timestamp/clean
+distclean-ext:: ext/distclean .bundle/distclean timestamp/distclean
+realclean-ext:: ext/realclean .bundle/realclean timestamp/realclean
 
 ext/clean.mk ext/distclean.mk ext/realclean.mk::
 ext/clean:: ext/clean.mk
 ext/distclean:: ext/distclean.mk
 ext/realclean:: ext/realclean.mk
 
-timestamp/clean:: ext/clean gems/clean
-timestamp/distclean:: ext/distclean gems/distclean
-timestamp/realclean:: ext/realclean gems/realclean
+timestamp/clean:: ext/clean .bundle/clean
+timestamp/distclean:: ext/distclean .bundle/distclean
+timestamp/realclean:: ext/realclean .bundle/realclean
 
 timestamp/clean timestamp/distclean timestamp/realclean::
 	$(Q)$(RM) $(TIMESTAMPDIR)/.*.time $(TIMESTAMPDIR)/$(arch)/.time
@@ -733,15 +793,22 @@ clean-capi distclean-capi realclean-capi:
 
 clean-platform distclean-platform realclean-platform:
 	$(Q) $(RM) $(PLATFORM_D)
-	-$(Q) $(RMDIR) $(PLATFORM_DIR) 2> $(NULL) || $(NULLCMD)
+	-$(Q) $(RMDIR) $(PLATFORM_DIR) $(TIMESTAMPDIR) 2> $(NULL) || $(NULLCMD)
 
 RUBYSPEC_CAPIEXT = spec/ruby/optional/capi/ext
+RUBYSPEC_CAPIEXT_SRCDIR = $(srcdir)/$(RUBYSPEC_CAPIEXT)
+RUBYSPEC_CAPIEXT_DEPS = $(RUBYSPEC_CAPIEXT_SRCDIR)/rubyspec.h $(RUBY_H_INCLUDES) {$(VPATH)}internal/abi.h $(LIBRUBY)
+RUBYSPEC_CAPIEXT_BUILD = $(enable_shared:yes=rubyspec-capiext)
+
+rubyspec-capiext: build-ext $(DOT_WAIT)
+# make-dependent rules should be included after this and built after build-ext.
+
 clean-spec: PHONY
 	-$(Q) $(RM) $(RUBYSPEC_CAPIEXT)/*.$(OBJEXT) $(RUBYSPEC_CAPIEXT)/*.$(DLEXT)
 	-$(Q) $(RMDIRS) $(RUBYSPEC_CAPIEXT) 2> $(NULL) || $(NULLCMD)
 	-$(Q) $(RMALL) rubyspec_temp
 
-check: main test test-tool test-all test-spec
+check: main $(DOT_WAIT) test $(DOT_WAIT) test-tool $(DOT_WAIT) test-all
 	$(ECHO) check succeeded
 	-$(Q) : : "run only on sh"; \
 	if [ x"$(GIT)" != x ] && $(CHDIR) "$(srcdir)" && \
@@ -755,26 +822,42 @@ fake: $(CROSS_COMPILING)-fake
 yes-fake: $(arch)-fake.rb $(RBCONFIG) PHONY
 no-fake -fake: PHONY
 
-# really doesn't depend on .o, just ensure newer than headers which
-# version.o depends on.
-$(arch)-fake.rb: $(srcdir)/template/fake.rb.in $(tooldir)/generic_erb.rb version.$(OBJEXT) miniruby$(EXEEXT)
+$(HAVE_BASERUBY:no=)$(arch)-fake.rb: miniruby$(EXEEXT)
+
+# actually depending on other headers more.
+$(arch:noarch=ignore)-fake.rb: $(top_srcdir)/revision.h $(top_srcdir)/version.h $(srcdir)/version.c
+$(arch:noarch=ignore)-fake.rb: {$(VPATH)}id.h {$(VPATH)}vm_opts.h $(REVISION_H)
+
+$(arch:noarch=ignore)-fake.rb: $(srcdir)/template/fake.rb.in $(tooldir)/generic_erb.rb
 	$(ECHO) generating $@
 	$(Q) $(CPP) -DRUBY_EXPORT $(INCFLAGS) $(CPPFLAGS) "$(srcdir)/version.c" | \
 	$(BOOTSTRAPRUBY) "$(tooldir)/generic_erb.rb" -o $@ "$(srcdir)/template/fake.rb.in" \
-		i=- srcdir="$(srcdir)" BASERUBY="$(BASERUBY)"
+	    i=- srcdir="$(srcdir)" BASERUBY="$(BASERUBY)" \
+	    LIBPATHENV="$(LIBPATHENV)" PRELOADENV="$(PRELOADENV)" LIBRUBY_SO="$(LIBRUBY_SO)"
 
+noarch-fake.rb: # prerequisite of yes-fake
+	$(Q) exit > $@
+
+# runner: BASERUBY, target: miniruby
 btest: $(TEST_RUNNABLE)-btest
 no-btest: PHONY
 yes-btest: yes-fake miniruby$(EXEEXT) PHONY
 	$(ACTIONS_GROUP)
-	$(Q)$(exec) $(BOOTSTRAPRUBY) "$(srcdir)/bootstraptest/runner.rb" --ruby="$(BTESTRUBY) $(RUN_OPTS)" $(OPTS) $(TESTOPTS) $(BTESTS)
+	$(Q)$(gnumake_recursive)$(exec) $(BOOTSTRAPRUBY) "$(srcdir)/bootstraptest/runner.rb" --ruby="$(BTESTRUBY) $(RUN_OPTS)" $(OPTS) $(TESTOPTS) $(BTESTS)
 	$(ACTIONS_ENDGROUP)
 
+# runner: ruby, target: ruby
 btest-ruby: $(TEST_RUNNABLE)-btest-ruby
 no-btest-ruby: PHONY
 yes-btest-ruby: prog PHONY
 	$(ACTIONS_GROUP)
-	$(Q)$(exec) $(RUNRUBY) "$(srcdir)/bootstraptest/runner.rb" --ruby="$(PROGRAM) -I$(srcdir)/lib $(RUN_OPTS)" -q $(OPTS) $(TESTOPTS) $(BTESTS)
+	$(Q)$(gnumake_recursive)$(exec) $(RUNRUBY) "$(srcdir)/bootstraptest/runner.rb" --ruby="$(PROGRAM) -I$(srcdir)/lib $(RUN_OPTS)" $(OPTS) $(TESTOPTS) $(BTESTS)
+	$(ACTIONS_ENDGROUP)
+
+# runner: BASERUBY, target: ruby
+btest-bruby: prog PHONY
+	$(ACTIONS_GROUP)
+	$(Q)$(gnumake_recursive)$(exec) $(BOOTSTRAPRUBY) "$(srcdir)/bootstraptest/runner.rb" --ruby="$(PROGRAM) -I$(srcdir)/lib $(RUN_OPTS)" $(OPTS) $(TESTOPTS) $(BTESTS)
 	$(ACTIONS_ENDGROUP)
 
 rtest: yes-fake miniruby$(EXEEXT) PHONY
@@ -807,24 +890,36 @@ no-test-testframework: PHONY
 test-tool: $(TEST_RUNNABLE)-test-tool
 yes-test-tool: prog PHONY
 	$(ACTIONS_GROUP)
-	$(gnumake_recursive)$(Q)$(exec) $(RUNRUBY) "$(TOOL_TESTSDIR)/runner.rb" --ruby="$(RUNRUBY)" $(TESTOPTS)
+	$(gnumake_recursive)$(Q)$(exec) $(RUNRUBY) "$(TOOL_TESTSDIR)/runner.rb" --ruby="$(RUNRUBY)" $(TESTOPTS) $(TESTS)
 	$(ACTIONS_ENDGROUP)
 no-test-tool: PHONY
 
 test-sample: test-basic # backward compatibility for mswin-build
-test-short: btest-ruby test-knownbug test-basic
+test-short: btest-ruby $(DOT_WAIT) test-knownbug $(DOT_WAIT) test-basic
 test: test-short
 
+# Separate to skip updating encs and exts by `make -o test-precheck`
+# for GNU make.
+test-precheck: $(ENCSTATIC:static=lib)encs $(RUBYSPEC_CAPIEXT_BUILD) exts PHONY $(DOT_WAIT)
+yes-test-all-precheck: programs $(DOT_WAIT) test-precheck
+
+PRECHECK_TEST_ALL = yes-test-all-precheck
+
 # $ make test-all TESTOPTS="--help" displays more detail
 # for example, make test-all TESTOPTS="-j2 -v -n test-name -- test-file-name"
 test-all: $(TEST_RUNNABLE)-test-all
-yes-test-all: programs PHONY
+yes-test-all: $(PRECHECK_TEST_ALL)
 	$(ACTIONS_GROUP)
-	$(gnumake_recursive)$(Q)$(exec) $(RUNRUBY) "$(TESTSDIR)/runner.rb" --ruby="$(RUNRUBY)" $(TEST_EXCLUDES) $(TESTOPTS) $(TESTS)
+	$(gnumake_recursive)$(Q)$(exec) $(RUNRUBY) -r$(tooldir)/lib/_tmpdir \
+	"$(TESTSDIR)/runner.rb" --ruby="$(RUNRUBY)" \
+	$(TEST_EXCLUDES) $(TESTOPTS) $(TESTS)
 	$(ACTIONS_ENDGROUP)
 TESTS_BUILD = mkmf
 no-test-all: PHONY
-	$(gnumake_recursive)$(MINIRUBY) -I"$(srcdir)/lib" "$(TESTSDIR)/runner.rb" $(TESTOPTS) $(TESTS_BUILD)
+	$(ACTIONS_GROUP)
+	$(gnumake_recursive)$(MINIRUBY) -I"$(srcdir)/lib" -r$(tooldir)/lib/_tmpdir \
+	"$(TESTSDIR)/runner.rb" $(TESTOPTS) $(TESTS_BUILD)
+	$(ACTIONS_ENDGROUP)
 
 test-almost: test-all
 yes-test-almost: yes-test-all
@@ -839,7 +934,10 @@ extconf: $(PREP)
 	$(Q) $(MAKEDIRS) "$(EXTCONFDIR)"
 	$(RUNRUBY) -C "$(EXTCONFDIR)" $(EXTCONF) $(EXTCONFARGS)
 
-$(RBCONFIG): $(tooldir)/mkconfig.rb config.status $(srcdir)/version.h
+rbconfig.rb: $(RBCONFIG)
+
+$(HAVE_BASERUBY:no=)$(RBCONFIG)$(HAVE_BASERUBY:no=): $(PREP)
+$(RBCONFIG): $(tooldir)/mkconfig.rb config.status $(srcdir)/version.h $(srcdir)/common.mk
 	$(Q)$(BOOTSTRAPRUBY) -n \
 	-e 'BEGIN{version=ARGV.shift;mis=ARGV.dup}' \
 	-e 'END{abort "UNICODE version mismatch: #{mis}" unless mis.empty?}' \
@@ -857,21 +955,32 @@ $(RBCONFIG): $(tooldir)/mkconfig.rb config.status $(srcdir)/version.h
 test-rubyspec: test-spec
 yes-test-rubyspec: yes-test-spec
 
-test-spec-precheck: programs
+yes-test-spec-precheck: yes-test-all-precheck yes-fake
 
 test-spec: $(TEST_RUNNABLE)-test-spec
-yes-test-spec: test-spec-precheck
+yes-test-spec: yes-test-spec-precheck
 	$(ACTIONS_GROUP)
 	$(gnumake_recursive)$(Q) \
-	$(RUNRUBY) -r./$(arch)-fake $(srcdir)/spec/mspec/bin/mspec run -B $(srcdir)/spec/default.mspec $(MSPECOPT) $(SPECOPTS)
+	$(RUNRUBY) -r./$(arch)-fake -r$(tooldir)/lib/_tmpdir \
+		$(srcdir)/spec/mspec/bin/mspec run -B $(srcdir)/spec/default.mspec $(MSPECOPT) $(SPECOPTS)
 	$(ACTIONS_ENDGROUP)
 no-test-spec:
 
+check: $(DOT_WAIT) test-spec
+
 RUNNABLE = $(LIBRUBY_RELATIVE:no=un)-runnable
-runnable: $(RUNNABLE) prog $(tooldir)/mkrunnable.rb PHONY
+runnable: $(RUNNABLE)
+runnable-golf: golf
+runnable $(enable_shared:yes=runnable-golf): prog $(tooldir)/mkrunnable.rb PHONY
 	$(Q) $(MINIRUBY) $(tooldir)/mkrunnable.rb -v $(EXTOUT)
 yes-runnable: PHONY
 
+hello: $(TEST_RUNNABLE)-hello
+yes-hello: runnable-golf
+	./$(enable_shared:yes=bin/)$(GORUBY) -veh
+no-hello: runnable-golf
+	$(ECHO) Run ./$(enable_shared:yes=bin/)$(GORUBY) -veh
+
 encs: enc trans
 libencs: libenc libtrans
 encs enc trans libencs libenc libtrans: $(SHOWFLAGS) $(ENC_MK) $(LIBRUBY) $(PREP) PHONY
@@ -885,9 +994,10 @@ libtrans trans: {$(VPATH)}transdb.h
 ENC_HEADERS = $(srcdir)/enc/jis/props.h
 # Use MINIRUBY which loads fake.rb for cross compiling
 $(ENC_MK): $(srcdir)/enc/make_encmake.rb $(srcdir)/enc/Makefile.in $(srcdir)/enc/depend \
-	   $(srcdir)/enc/encinit.c.erb $(ENC_HEADERS) $(srcdir)/lib/mkmf.rb $(RBCONFIG) fake
+	   $(srcdir)/enc/encinit.c.erb $(ENC_HEADERS) $(srcdir)/lib/mkmf.rb $(RBCONFIG) $(HAVE_BASERUBY)-fake
 	$(ECHO) generating $@
-	$(Q) $(MINIRUBY) $(srcdir)/enc/make_encmake.rb --builtin-encs="$(BUILTIN_ENCOBJS)" --builtin-transes="$(BUILTIN_TRANSOBJS)" --module$(ENCSTATIC) $(ENCS) $@
+	$(Q) $(BOOTSTRAPRUBY_COMMAND) $(srcdir)/enc/make_encmake.rb \
+	  --builtin-encs="$(BUILTIN_ENCOBJS)" --builtin-transes="$(BUILTIN_TRANSOBJS)" --module$(ENCSTATIC) $(ENCS) $@
 
 .PRECIOUS: $(MKFILES)
 
@@ -895,8 +1005,11 @@ $(ENC_MK): $(srcdir)/enc/make_encmake.rb $(srcdir)/enc/Makefile.in $(srcdir)/enc
 .PHONY: test install install-nodoc install-doc dist
 .PHONY: loadpath golf capi rdoc install-prereq clear-installed-list
 .PHONY: clean clean-ext clean-local clean-enc clean-golf clean-rdoc clean-html clean-extout
+.PHONY: clean-srcs clean-srcs-local clean-srcs-ext
 .PHONY: distclean distclean-ext distclean-local distclean-enc distclean-golf distclean-extout
+.PHONY: distclean-srcs distclean-srcs-local distclean-srcs-ext
 .PHONY: realclean realclean-ext realclean-local realclean-enc realclean-golf realclean-extout
+.PHONY: realclean-srcs realclean-srcs-local realclean-srcs-ext
 .PHONY: exam check test test-short test-all btest btest-ruby test-basic test-knownbug
 .PHONY: run runruby parse benchmark gdb gdb-ruby
 .PHONY: update-mspec update-rubyspec test-rubyspec test-spec
@@ -904,30 +1017,24 @@ $(ENC_MK): $(srcdir)/enc/make_encmake.rb $(srcdir)/enc/Makefile.in $(srcdir)/enc
 
 PHONY:
 
-{$(VPATH)}parse.c: {$(VPATH)}parse.y $(tooldir)/ytab.sed {$(VPATH)}id.h
+{$(VPATH)}parse.c: {$(VPATH)}parse.y {$(VPATH)}id.h
 {$(VPATH)}parse.h: {$(VPATH)}parse.c
 
 {$(srcdir)}.y.c:
 	$(ECHO) generating $@
-	$(Q)$(BASERUBY) $(tooldir)/id2token.rb --path-separator=.$(PATH_SEPARATOR)./ --vpath=$(VPATH) id.h $(SRC_FILE) > parse.tmp.y
-	$(Q)$(BASERUBY) $(tooldir)/pure_parser.rb parse.tmp.y $(YACC)
-	$(Q)$(RM) parse.tmp.y.bak
-	$(Q)$(YACC) -d $(YFLAGS) -o y.tab.c parse.tmp.y
-	$(Q)$(RM) parse.tmp.y
-	$(Q)sed -f $(tooldir)/ytab.sed -e "/^#/s|parse\.tmp\.[iy]|$(SRC_FILE)|" -e "/^#/s!y\.tab\.c!$@!" y.tab.c > $@.new
-	$(Q)$(MV) $@.new $@
-	$(Q)sed -e "/^#line.*y\.tab\.h/d;/^#line.*parse.*\.y/d" y.tab.h > $(@:.c=.h)
-	$(Q)$(RM) y.tab.c y.tab.h
+	$(Q)$(BASERUBY) $(tooldir)/id2token.rb $(SRC_FILE) | \
+	$(LRAMA) $(YFLAGS) -o$@ -H$*.h - parse.y
 
 $(PLATFORM_D):
 	$(Q) $(MAKEDIRS) $(PLATFORM_DIR) $(@D)
 	@$(NULLCMD) > $@
 
-exe/$(PROGRAM): ruby-runner.c ruby-runner.h exe/.time miniruby$(EXEEXT) {$(VPATH)}config.h
+exe/$(PROGRAM): $(TIMESTAMPDIR)/$(arch)/.time
+exe/$(PROGRAM): ruby-runner.c ruby-runner.h exe/.time $(PREP) {$(VPATH)}config.h
 	$(Q) $(CC) $(CFLAGS) $(INCFLAGS) $(CPPFLAGS) -DRUBY_INSTALL_NAME=$(@F) $(COUTFLAG)ruby-runner.$(OBJEXT) -c $(CSRCFLAG)$(srcdir)/ruby-runner.c
 	$(Q) $(PURIFY) $(CC) $(CFLAGS) $(LDFLAGS) $(OUTFLAG)$@ ruby-runner.$(OBJEXT) $(LIBS)
 	$(Q) $(POSTLINK)
-	$(Q) ./miniruby$(EXEEXT) \
+	$(Q) $(BOOTSTRAPRUBY) \
 	    -e 'prog, dest, inst = ARGV; dest += "/ruby"' \
 	    -e 'exit unless prog==inst' \
 	    -e 'unless prog=="ruby"' \
@@ -935,6 +1042,8 @@ exe/$(PROGRAM): ruby-runner.c ruby-runner.h exe/.time miniruby$(EXEEXT) {$(VPATH
 	    -e '  File.symlink(prog, dest)' \
 	    -e 'end' \
 	$(@F) $(@D) $(RUBY_INSTALL_NAME)$(EXEEXT)
+	$(Q) $(BOOTSTRAPRUBY) -r$(srcdir)/lib/fileutils \
+	    -e 'FileUtils::Verbose.ln_sr(*ARGV, force: true)' rbconfig.rb $(EXTOUT)/$(arch)
 
 exe/.time:
 	$(Q) $(MAKEDIRS) $(@D)
@@ -1002,7 +1111,7 @@ parse.$(OBJEXT): {$(VPATH)}parse.c
 miniprelude.$(OBJEXT): {$(VPATH)}miniprelude.c
 
 # dependencies for optional sources.
-compile.$(OBJEXT): {$(VPATH)}opt_sc.inc {$(VPATH)}optunifs.inc
+compile.$(OBJEXT): {$(VPATH)}optunifs.inc
 
 win32/win32.$(OBJEXT): {$(VPATH)}win32/win32.c {$(VPATH)}win32/file.h \
   {$(VPATH)}dln.h {$(VPATH)}dln_find.c {$(VPATH)}encindex.h \
@@ -1029,7 +1138,6 @@ INSNS2VMOPT = --srcdir="$(srcdir)"
 srcs_vpath = {$(VPATH)}
 
 inc_common_headers = $(tooldir)/ruby_vm/views/_copyright.erb $(tooldir)/ruby_vm/views/_notice.erb
-$(srcs_vpath)opt_sc.inc: $(tooldir)/ruby_vm/views/opt_sc.inc.erb $(inc_common_headers)
 $(srcs_vpath)optinsn.inc: $(tooldir)/ruby_vm/views/optinsn.inc.erb $(inc_common_headers)
 $(srcs_vpath)optunifs.inc: $(tooldir)/ruby_vm/views/optunifs.inc.erb $(inc_common_headers)
 $(srcs_vpath)insns.inc: $(tooldir)/ruby_vm/views/insns.inc.erb $(inc_common_headers)
@@ -1037,15 +1145,11 @@ $(srcs_vpath)insns_info.inc: $(tooldir)/ruby_vm/views/insns_info.inc.erb $(inc_c
   $(tooldir)/ruby_vm/views/_insn_type_chars.erb $(tooldir)/ruby_vm/views/_insn_name_info.erb \
   $(tooldir)/ruby_vm/views/_insn_len_info.erb $(tooldir)/ruby_vm/views/_insn_operand_info.erb \
   $(tooldir)/ruby_vm/views/_attributes.erb $(tooldir)/ruby_vm/views/_comptime_insn_stack_increase.erb \
-  $(tooldir)/ruby_vm/views/_insn_sp_pc_dependency.erb
+  $(tooldir)/ruby_vm/views/_zjit_helpers.erb $(tooldir)/ruby_vm/views/_insn_leaf_info.erb
 $(srcs_vpath)vmtc.inc: $(tooldir)/ruby_vm/views/vmtc.inc.erb $(inc_common_headers)
 $(srcs_vpath)vm.inc: $(tooldir)/ruby_vm/views/vm.inc.erb $(inc_common_headers) \
-  $(tooldir)/ruby_vm/views/_insn_entry.erb $(tooldir)/ruby_vm/views/_trace_instruction.erb
-$(srcs_vpath)mjit_compile.inc: $(tooldir)/ruby_vm/views/mjit_compile.inc.erb $(inc_common_headers) \
-  $(tooldir)/ruby_vm/views/_mjit_compile_insn.erb $(tooldir)/ruby_vm/views/_mjit_compile_send.erb \
-  $(tooldir)/ruby_vm/views/_mjit_compile_ivar.erb \
-  $(tooldir)/ruby_vm/views/_mjit_compile_insn_body.erb $(tooldir)/ruby_vm/views/_mjit_compile_pc_and_sp.erb \
-  $(tooldir)/ruby_vm/views/_mjit_compile_invokebuiltin.erb $(tooldir)/ruby_vm/views/_mjit_compile_getinlinecache.erb
+  $(tooldir)/ruby_vm/views/_insn_entry.erb $(tooldir)/ruby_vm/views/_trace_instruction.erb \
+  $(tooldir)/ruby_vm/views/_zjit_instruction.erb
 
 BUILTIN_RB_SRCS = \
 		$(srcdir)/ast.rb \
@@ -1058,25 +1162,39 @@ BUILTIN_RB_SRCS = \
 		$(srcdir)/trace_point.rb \
 		$(srcdir)/warning.rb \
 		$(srcdir)/array.rb \
+		$(srcdir)/hash.rb \
 		$(srcdir)/kernel.rb \
+		$(srcdir)/pathname_builtin.rb \
 		$(srcdir)/ractor.rb \
+		$(srcdir)/symbol.rb \
 		$(srcdir)/timev.rb \
+		$(srcdir)/thread_sync.rb \
 		$(srcdir)/nilclass.rb \
 		$(srcdir)/prelude.rb \
 		$(srcdir)/gem_prelude.rb \
+		$(srcdir)/jit_hook.rb \
+		$(srcdir)/jit_undef.rb \
 		$(srcdir)/yjit.rb \
+		$(srcdir)/zjit.rb \
 		$(empty)
 BUILTIN_RB_INCS = $(BUILTIN_RB_SRCS:.rb=.rbinc)
 
 common-srcs: $(srcs_vpath)parse.c $(srcs_vpath)lex.c $(srcs_vpath)enc/trans/newline.c $(srcs_vpath)id.c \
 	     $(BUILTIN_RB_INCS) \
-	     srcs-lib srcs-ext incs
+	     srcs-lib srcs-ext incs preludes
 
 missing-srcs: $(srcdir)/missing/des_tables.c
 
-srcs: common-srcs missing-srcs srcs-enc
+srcs: common-srcs missing-srcs srcs-enc srcs-doc
+
+RIPPER_SRCS = $(srcdir)/ext/ripper/ripper.c \
+	      $(srcdir)/ext/ripper/ripper_init.c \
+	      $(srcdir)/ext/ripper/eventids1.h \
+	      $(srcdir)/ext/ripper/eventids1.c \
+	      $(srcdir)/ext/ripper/eventids2table.c \
+	      # RIPPER_SRCS
 
-EXT_SRCS = $(srcdir)/ext/ripper/ripper.c \
+EXT_SRCS = ripper_srcs \
 	   $(srcdir)/ext/rbconfig/sizeof/sizes.c \
 	   $(srcdir)/ext/rbconfig/sizeof/limits.c \
 	   $(srcdir)/ext/socket/constdefs.c \
@@ -1087,7 +1205,7 @@ srcs-ext: $(EXT_SRCS)
 realclean-srcs-ext::
 	$(Q)$(RM) $(EXT_SRCS)
 
-EXTRA_SRCS = $(srcdir)/ext/json/parser/parser.c \
+EXTRA_SRCS = \
 	     $(srcdir)/ext/date/zonetab.h \
 	     $(empty)
 
@@ -1103,7 +1221,7 @@ srcs-enc: $(ENC_MK)
 	$(ECHO) making srcs under enc
 	$(Q) $(MAKE) $(MAKE_ENC) srcs
 
-all-incs: incs {$(VPATH)}encdb.h {$(VPATH)}transdb.h
+all-incs: incs {$(VPATH)}encdb.h {$(VPATH)}transdb.h {$(VPATH)}probes.h
 incs: $(INSNS) {$(VPATH)}node_name.inc {$(VPATH)}known_errors.inc \
       {$(VPATH)}vm_call_iseq_optimized.inc $(srcdir)/revision.h \
       $(REVISION_H) \
@@ -1122,17 +1240,17 @@ id.c: $(tooldir)/generic_erb.rb $(srcdir)/template/id.c.tmpl $(srcdir)/defs/id.d
 	$(Q) $(BASERUBY) $(tooldir)/generic_erb.rb --output=$@ \
 		$(srcdir)/template/id.c.tmpl
 
-node_name.inc: $(tooldir)/node_name.rb $(srcdir)/node.h
+node_name.inc: $(tooldir)/node_name.rb $(srcdir)/rubyparser.h
 	$(ECHO) generating $@
-	$(Q) $(BASERUBY) -n $(tooldir)/node_name.rb < $(srcdir)/node.h > $@
+	$(Q) $(BASERUBY) -n $(tooldir)/node_name.rb < $(srcdir)/rubyparser.h > $@
 
-encdb.h: $(PREP) $(tooldir)/generic_erb.rb $(srcdir)/template/encdb.h.tmpl
+encdb.h: $(RBCONFIG) $(tooldir)/generic_erb.rb $(srcdir)/template/encdb.h.tmpl
 	$(ECHO) generating $@
-	$(Q) $(MINIRUBY) $(tooldir)/generic_erb.rb -c -o $@ $(srcdir)/template/encdb.h.tmpl $(srcdir)/enc enc
+	$(Q) $(BOOTSTRAPRUBY) $(tooldir)/generic_erb.rb -c -o $@ $(srcdir)/template/encdb.h.tmpl $(srcdir)/enc enc
 
-transdb.h: $(PREP) srcs-enc $(tooldir)/generic_erb.rb $(srcdir)/template/transdb.h.tmpl
+transdb.h: $(RBCONFIG) srcs-enc $(tooldir)/generic_erb.rb $(srcdir)/template/transdb.h.tmpl
 	$(ECHO) generating $@
-	$(Q) $(MINIRUBY) $(tooldir)/generic_erb.rb -c -o $@ $(srcdir)/template/transdb.h.tmpl $(srcdir)/enc/trans enc/trans
+	$(Q) $(BOOTSTRAPRUBY) $(tooldir)/generic_erb.rb -c -o $@ $(srcdir)/template/transdb.h.tmpl $(srcdir)/enc/trans enc/trans
 
 enc/encinit.c: $(ENC_MK) $(srcdir)/enc/encinit.c.erb
 
@@ -1149,10 +1267,7 @@ $(MINIPRELUDE_C): $(COMPILE_PRELUDE) $(BUILTIN_RB_SRCS)
 	$(Q) $(BASERUBY) $(tooldir)/generic_erb.rb -I$(srcdir) -o $@ \
 		$(srcdir)/template/prelude.c.tmpl $(BUILTIN_RB_SRCS)
 
-$(GOLF_PRELUDE_C): $(COMPILE_PRELUDE) {$(srcdir)}golf_prelude.rb
-	$(ECHO) generating $@
-	$(Q) $(BASERUBY) $(tooldir)/generic_erb.rb -I$(srcdir) -c -o $@ \
-		$(srcdir)/template/prelude.c.tmpl golf_prelude.rb
+golf_prelude.rbbin: {$(srcdir)}golf_prelude.rb $(tooldir)/mk_rbbin.rb $(PREP)
 
 MAINCPPFLAGS = $(ENABLE_DEBUG_ENV:yes=-DRUBY_DEBUG_ENV=1)
 
@@ -1170,43 +1285,52 @@ probes.h: {$(VPATH)}probes.$(DTRACE_EXT)
 prereq: incs srcs preludes PHONY
 
 preludes: {$(VPATH)}miniprelude.c
-preludes: {$(srcdir)}golf_prelude.c
+
+{$(srcdir)}.rb.rbbin:
+	$(ECHO) making $@
+	$(Q) $(MINIRUBY) $(tooldir)/mk_rbbin.rb $(SRC_FILE) > $(OS_DEST_FILE)
 
 {$(srcdir)}.rb.rbinc:
 	$(ECHO) making $@
-	$(Q) $(BASERUBY) $(tooldir)/mk_builtin_loader.rb $<
+	$(Q) $(BASERUBY) $(tooldir)/mk_builtin_loader.rb $(SRC_FILE)
 
-builtin_binary.inc: $(PREP) $(BUILTIN_RB_SRCS) $(srcdir)/template/builtin_binary.inc.tmpl
+$(BUILTIN_BINARY:yes=built)in_binary.rbbin: $(PREP) $(BUILTIN_RB_SRCS) $(srcdir)/template/builtin_binary.rbbin.tmpl
 	$(Q) $(MINIRUBY) $(tooldir)/generic_erb.rb -o $@ \
-		$(srcdir)/template/builtin_binary.inc.tmpl -- --cross=$(CROSS_COMPILING)
+		$(srcdir)/template/builtin_binary.rbbin.tmpl
+	-$(Q) sha256sum $@ 2> $(NULL) || $(NULLCMD)
+
+$(BUILTIN_BINARY:no=builtin)_binary.rbbin:
+	$(Q) echo> $@ // empty $(@F)
 
 $(BUILTIN_RB_INCS): $(top_srcdir)/tool/mk_builtin_loader.rb
 
-$(srcdir)/revision.h:
-$(srcdir)/revision.h$(gnumake:yes=-nongnumake):
-	$(Q)$(RM) $(@F)
-	$(Q)$(NULLCMD) > $@ || $(NULLCMD) > $(@F)
+$(srcdir)/revision.h$(no_baseruby:no=~disabled~): $(REVISION_H)
+
+$(REVISION_H)$(no_baseruby:no=~disabled~):
+	$(Q) $(BASERUBY) $(tooldir)/file2lastrev.rb -q --revision.h --srcdir="$(srcdir)" --output=revision.h --timestamp=$@
+$(REVISION_H)$(yes_baseruby:yes=~disabled~):
+	$(Q) exit > $@
 
-revision.tmp::
-	$(Q) $(NULLCMD) > $@
-revision.$(HAVE_BASERUBY:yes=tmp):: $(srcdir)/version.h $(tooldir)/file2lastrev.rb $(REVISION_FORCE)
-	$(Q) $(BASERUBY) $(tooldir)/file2lastrev.rb -q --revision.h --srcdir="$(srcdir)" > $@
+# uncommon.mk: $(REVISION_H)
+# $(MKFILES): $(REVISION_H)
 
-$(REVISION_H): revision.tmp
-	$(Q)$(IFCHANGE) "--timestamp=$@" "$(srcdir)/revision.h" revision.tmp
+# $(common_mk_includes) is set by config.status or GNUmakefile
+common_mk__$(gnumake:yes=artifact)_ = uncommon.mk
+common_mk_$(gnumake)_artifact_ = $(MKFILES)
+$(common_mk__artifact_): $(srcdir)/common.mk $(common_mk_includes)
 
-$(srcdir)/ext/ripper/ripper.c: $(srcdir)/ext/ripper/tools/preproc.rb $(srcdir)/parse.y id.h $(srcdir)/ext/ripper/depend
+ripper_srcs: $(RIPPER_SRCS)
+
+$(RIPPER_SRCS): $(srcdir)/parse.y $(srcdir)/defs/id.def
+$(RIPPER_SRCS): $(srcdir)/ext/ripper/depend $(srcdir)/ext/ripper/extconf.rb
+$(RIPPER_SRCS): $(srcdir)/ext/ripper/tools/preproc.rb $(srcdir)/ext/ripper/tools/dsl.rb
+$(RIPPER_SRCS): $(srcdir)/ext/ripper/ripper_init.c.tmpl $(srcdir)/ext/ripper/eventids2.c
 	$(ECHO) generating $@
 	$(Q) $(CHDIR) $(@D) && \
-	sed -e 's/{\$$([^(){}]*)[^{}]*}//g' -e /AUTOGENERATED/q depend | \
+	$(CAT_DEPEND) depend | \
 	$(exec) $(MAKE) -f - $(mflags) \
-		Q=$(Q) ECHO=$(ECHO) RM="$(RM1)" BISON=$(YACC) top_srcdir=../.. srcdir=. VPATH=../.. \
-		RUBY="$(BASERUBY)" PATH_SEPARATOR="$(PATH_SEPARATOR)" LANG=C
-
-$(srcdir)/ext/json/parser/parser.c: $(srcdir)/ext/json/parser/parser.rl $(srcdir)/ext/json/parser/prereq.mk
-	$(ECHO) generating $@
-	$(Q) $(CHDIR) $(@D) && $(exec) $(MAKE) -f prereq.mk $(mflags) \
-		Q=$(Q) ECHO=$(ECHO) top_srcdir=../../.. srcdir=. VPATH=../../.. BASERUBY="$(BASERUBY)"
+		Q=$(Q) ECHO=$(ECHO) RM="$(RM1)" top_srcdir=../.. srcdir=. VPATH=../.. \
+		RUBY="$(BASERUBY)" BASERUBY="$(BASERUBY)" PATH_SEPARATOR="$(PATH_SEPARATOR)" LANG=C
 
 $(srcdir)/ext/date/zonetab.h: $(srcdir)/ext/date/zonetab.list $(srcdir)/ext/date/prereq.mk
 	$(ECHO) generating $@
@@ -1217,7 +1341,7 @@ $(srcdir)/ext/rbconfig/sizeof/sizes.c: $(srcdir)/ext/rbconfig/sizeof/depend \
 		$(tooldir)/generic_erb.rb $(srcdir)/template/sizes.c.tmpl $(srcdir)/configure.ac
 	$(ECHO) generating $@
 	$(Q) $(CHDIR) $(@D) && \
-	sed '/AUTOGENERATED/q' depend | \
+	$(CAT_DEPEND) depend | \
 	$(exec) $(MAKE) -f - $(mflags) \
 		Q=$(Q) ECHO=$(ECHO) top_srcdir=../../.. srcdir=. VPATH=../../.. RUBY="$(BASERUBY)" $(@F)
 
@@ -1225,19 +1349,19 @@ $(srcdir)/ext/rbconfig/sizeof/limits.c: $(srcdir)/ext/rbconfig/sizeof/depend \
 		$(tooldir)/generic_erb.rb $(srcdir)/template/limits.c.tmpl
 	$(ECHO) generating $@
 	$(Q) $(CHDIR) $(@D) && \
-	sed '/AUTOGENERATED/q' depend | \
+	$(CAT_DEPEND) depend | \
 	$(exec) $(MAKE) -f - $(mflags) \
 		Q=$(Q) ECHO=$(ECHO) top_srcdir=../../.. srcdir=. VPATH=../../.. RUBY="$(BASERUBY)" $(@F)
 
-$(srcdir)/ext/socket/constdefs.c: $(srcdir)/ext/socket/depend
+$(srcdir)/ext/socket/constdefs.c: $(srcdir)/ext/socket/depend $(srcdir)/ext/socket/mkconstants.rb
 	$(Q) $(CHDIR) $(@D) && \
-	sed '/AUTOGENERATED/q' depend | \
+	$(CAT_DEPEND) depend | \
 	$(exec) $(MAKE) -f - $(mflags) \
 		Q=$(Q) ECHO=$(ECHO) top_srcdir=../.. srcdir=. VPATH=../.. RUBY="$(BASERUBY)"
 
 $(srcdir)/ext/etc/constdefs.h: $(srcdir)/ext/etc/depend
 	$(Q) $(CHDIR) $(@D) && \
-	sed '/AUTOGENERATED/q' depend | \
+	$(CAT_DEPEND) depend | \
 	$(exec) $(MAKE) -f - $(mflags) \
 		Q=$(Q) ECHO=$(ECHO) top_srcdir=../.. srcdir=. VPATH=../.. RUBY="$(BASERUBY)"
 
@@ -1249,8 +1373,8 @@ run: yes-fake miniruby$(EXEEXT) PHONY
 runruby: $(PROGRAM) PHONY
 	RUBY_ON_BUG='gdb -x $(srcdir)/.gdbinit -p' $(RUNRUBY) $(RUNOPT0) $(TESTRUN_SCRIPT) $(RUNOPT)
 
-runirb: $(PROGRAM) PHONY
-	RUBY_ON_BUG='gdb -x $(srcdir)/.gdbinit -p' $(RUNRUBY) $(RUNOPT0) -r irb -e 'IRB.start("make runirb")' $(RUNOPT)
+runirb: $(PROGRAM) update-default-gemspecs
+	RUBY_ON_BUG='gdb -x $(srcdir)/.gdbinit -p' $(RUNRUBY) $(RUNOPT0) -rrubygems -r irb -e 'IRB.start("make runirb")' $(RUNOPT)
 
 parse: yes-fake miniruby$(EXEEXT) PHONY
 	$(BTESTRUBY) --dump=parsetree_with_comment,insns $(TESTRUN_SCRIPT)
@@ -1291,9 +1415,10 @@ run.gdb:
 	echo '  quit'                         >> run.gdb
 	echo end                              >> run.gdb
 
+GDB = gdb
 
 gdb: miniruby$(EXEEXT) run.gdb PHONY
-	gdb -x run.gdb --quiet --args $(MINIRUBY) $(RUNOPT0) $(TESTRUN_SCRIPT) $(RUNOPT)
+	$(GDB) -x run.gdb --quiet --args $(MINIRUBY) $(RUNOPT0) $(TESTRUN_SCRIPT) $(RUNOPT)
 
 gdb-ruby: $(PROGRAM) run.gdb PHONY
 	$(Q) $(RUNRUBY_COMMAND) $(RUNRUBY_DEBUGGER) -- $(RUNOPT0) $(TESTRUN_SCRIPT) $(RUNOPT)
@@ -1309,23 +1434,28 @@ lldb-ruby: $(PROGRAM) PHONY
 DISTPKGS = gzip,zip,all
 PKGSDIR = tmp
 dist:
-	$(BASERUBY) $(tooldir)/make-snapshot \
+	$(BASERUBY) $(V0:1=-v) $(tooldir)/make-snapshot \
 	-srcdir=$(srcdir) -packages=$(DISTPKGS) \
 	-unicode-version=$(UNICODE_VERSION) \
 	$(DISTOPTS) $(PKGSDIR) $(RELNAME)
 
 up:: update-remote
 
-up::
+up$(DOT_WAIT)::
 	-$(Q)$(MAKE) $(mflags) Q=$(Q) REVISION_FORCE=PHONY ALWAYS_UPDATE_UNICODE= after-update
 
 yes::
 no::
 
+after-update:: common-srcs
 after-update:: $(REVISION_H)
 after-update:: extract-extlibs
 after-update:: extract-gems
 
+update-src::
+	$(Q) $(RM) $(REVISION_H) revision.h "$(srcdir)/$(REVISION_H)" "$(srcdir)/revision.h"
+	$(Q) exit > "$(srcdir)/revision.h"
+
 update-remote:: update-src update-download
 update-download:: $(ALWAYS_UPDATE_UNICODE:yes=update-unicode)
 update-download:: update-gems
@@ -1338,15 +1468,26 @@ update-config_files: PHONY
 	$(Q) $(BASERUBY) -C "$(srcdir)" tool/downloader.rb -d tool --cache-dir=$(CACHE_DIR) -e gnu \
 	    config.guess config.sub
 
+update-coverage: main PHONY
+	$(XRUBY) -C "$(srcdir)" bin/gem install --no-document \
+		--install-dir .bundle --conservative "simplecov"
+
 refresh-gems: update-bundled_gems prepare-gems
+# can't recall exactly, but `make` somewhere (not GNU or nmake)
+# couldn't handle spaces in replacement strings; i.e.,
+# `$(HAVE_BASERUBY:yes=word word ...)` didn't work.
 prepare-gems: $(HAVE_BASERUBY:yes=update-gems) $(HAVE_BASERUBY:yes=extract-gems)
+extract-gems: $(HAVE_BASERUBY:yes=update-gems) $(HAVE_BASERUBY:yes=outdate-bundled-gems)
+update-gems: $(HAVE_BASERUBY:yes=outdate-bundled-gems)
 
-update-gems$(gnumake:yes=-nongnumake): PHONY
+split_option = -F"\s+|$(HASH_SIGN).*"
+
+update-gems$(sequential): PHONY
 	$(ECHO) Downloading bundled gem files...
 	$(Q) $(BASERUBY) -C "$(srcdir)" \
-	    -I./tool -rdownloader -answ \
+	    -I./tool -rdownloader $(split_option) -answ \
 	    -e 'gem, ver = *$$F' \
-	    -e 'next if !ver or /^#/=~gem' \
+	    -e 'next if !ver' \
 	    -e 'old = Dir.glob("gems/#{gem}-*.gem")' \
 	    -e 'gem = "#{gem}-#{ver}.gem"' \
 	    -e 'Downloader::RubyGems.download(gem, "gems", nil) and' \
@@ -1355,98 +1496,174 @@ update-gems$(gnumake:yes=-nongnumake): PHONY
 	    -e 'FileUtils.rm_rf(old.map{'"|n|"'n.chomp(".gem")})' \
 	    gems/bundled_gems
 
-extract-gems$(gnumake:yes=-nongnumake): PHONY
+extract-gems$(sequential): PHONY
 	$(ECHO) Extracting bundled gem files...
-	$(Q) $(RUNRUBY) -C "$(srcdir)" \
-	    -Itool -rfileutils -rgem-unpack -answ \
-	    -e 'BEGIN {FileUtils.mkdir_p(d = ".bundle/gems")}' \
-	    -e 'BEGIN {FileUtils.mkdir_p(s = ".bundle/specifications")}' \
-	    -e 'gem, ver = *$$F' \
-	    -e 'next if !ver or /^#/=~gem' \
+	$(Q) $(BASERUBY) -C "$(srcdir)" \
+	    -Itool/lib -rfileutils -rbundled_gem $(split_option) -answ \
+	    -e 'BEGIN {d = ".bundle/gems"}' \
+	    -e 'gem, ver, _, rev = *$$F' \
+	    -e 'next if !ver' \
 	    -e 'g = "#{gem}-#{ver}"' \
-	    -e 'File.directory?("#{d}/#{g}") or Gem.unpack("gems/#{g}.gem", d, s)' \
-	    -e 'FileUtils.rm_rf("#{d}/#{g}/.github")' \
+	    -e 'unless File.directory?("#{d}/#{g}")' \
+	    -e   'if rev and File.exist?(gs = "gems/src/#{gem}/#{gem}.gemspec")' \
+	    -e     'BundledGem.build(gs, ver, "gems")' \
+	    -e   'end' \
+	    -e   'BundledGem.unpack("gems/#{g}.gem", ".bundle")' \
+	    -e 'end' \
 	    gems/bundled_gems
 
+extract-gems$(sequential): $(HAVE_GIT:yes=clone-bundled-gems-src)
+
+flush-gems: outdate-bundled-gems
+outdate-bundled-gems: PHONY
+	$(Q) $(BASERUBY) $(tooldir)/$@.rb --make="$(MAKE)" --mflags="$(MFLAGS)" \
+	--ruby-platform=$(arch) --ruby-version=$(ruby_version) \
+	"$(srcdir)"
+
 update-bundled_gems: PHONY
 	$(Q) $(RUNRUBY) -rrubygems \
 	     $(tooldir)/update-bundled_gems.rb \
 	     "$(srcdir)/gems/bundled_gems" | \
 	$(IFCHANGE) "$(srcdir)/gems/bundled_gems" -
-	git -C "$(srcdir)" diff --no-ext-diff --ignore-submodules --exit-code || \
-	git -C "$(srcdir)" commit -m "Update bundled_gems" gems/bundled_gems
+	$(GIT_IN_SRC) diff --no-ext-diff --ignore-submodules --exit-code || \
+	$(GIT_IN_SRC) commit -m "Update bundled_gems" gems/bundled_gems
 
-PRECHECK_BUNDLED_GEMS = test-bundled-gems-precheck
+PRECHECK_BUNDLED_GEMS = yes
 test-bundled-gems-precheck: $(TEST_RUNNABLE)-test-bundled-gems-precheck
-yes-test-bundled-gems-precheck: main
+yes-test-bundled-gems-precheck: $(PRECHECK_BUNDLED_GEMS:yes=main)
 no-test-bundled-gems-precheck:
 
+update-default-gemspecs: $(TEST_RUNNABLE)-update-default-gemspecs
+no-update-default-gemspecs:
+yes-update-default-gemspecs: $(PRECHECK_BUNDLED_GEMS:yes=main)
+	@$(MAKEDIRS) $(srcdir)/.bundle/specifications
+	@$(XRUBY) -W0 -C "$(srcdir)" -rrubygems \
+	    -e "destdir = ARGV.shift" \
+	    -e "ARGV.each do |basedir|" \
+	    -e   "Dir.glob(basedir+'/**/*.gemspec') do |g|" \
+	    -e     "dir, base = File.split(g)" \
+	    -e     "spec = Dir.chdir(dir) {Gem::Specification.load(base)} ||" \
+	    -e         "Gem::Specification.load(g)" \
+	    -e     "unless spec" \
+	    -e       "puts %[Ignoring #{g}]" \
+	    -e       "next" \
+	    -e     "end" \
+	    -e     "spec.files.clear" \
+	    -e     "spec.extensions.clear" \
+	    -e     "File.binwrite(File.join(destdir, spec.full_name+'.gemspec'), spec.to_ruby)" \
+	    -e   "end" \
+	    -e "end" \
+	    -- .bundle/specifications lib ext
+
+install-for-test-bundled-gems: $(TEST_RUNNABLE)-install-for-test-bundled-gems
+no-install-for-test-bundled-gems: no-update-default-gemspecs
+yes-install-for-test-bundled-gems: yes-update-default-gemspecs
+	$(XRUBY) -C "$(srcdir)" -r./tool/lib/gem_env.rb bin/gem \
+		install --no-document --conservative \
+		"hoe" "json-schema:5.1.0" "test-unit-rr" "simplecov" "simplecov-html" "simplecov-json" "rspec" "zeitwerk" \
+		"sinatra" "rack" "tilt" "mustermann" "base64" "compact_index" "rack-test" "logger" "kpeg" "tracer" "minitest-mock"
+
 test-bundled-gems-fetch: yes-test-bundled-gems-fetch
-yes-test-bundled-gems-fetch: $(PREP)
-	$(ACTIONS_GROUP)
-	$(Q) $(BASERUBY) -C $(srcdir)/gems ../tool/fetch-bundled_gems.rb src bundled_gems
-	$(ACTIONS_ENDGROUP)
+yes-test-bundled-gems-fetch: clone-bundled-gems-src
+clone-bundled-gems-src: PHONY
+	$(Q) $(BASERUBY) -C $(srcdir) tool/fetch-bundled_gems.rb BUNDLED_GEMS="$(BUNDLED_GEMS)" gems/src gems/bundled_gems
 no-test-bundled-gems-fetch:
 
-test-bundled-gems-prepare: $(PRECHECK_BUNDLED_GEMS) test-bundled-gems-fetch
 test-bundled-gems-prepare: $(TEST_RUNNABLE)-test-bundled-gems-prepare
-no-test-bundled-gems-prepare: no-test-bundled-gems-precheck
-yes-test-bundled-gems-prepare: yes-test-bundled-gems-precheck
+no-test-bundled-gems-prepare: no-test-bundled-gems-precheck no-test-bundled-gems-fetch
+Preparing-test-bundled-gems:
 	$(ACTIONS_GROUP)
-	$(XRUBY) -C "$(srcdir)" bin/gem install --no-document \
-		--install-dir .bundle --conservative "bundler" "minitest:~> 5" "test-unit" "rake" "hoe" "yard" "pry" "packnga" "rexml" "json-schema" "test-unit-rr"
+yes-test-bundled-gems-prepare: Preparing-test-bundled-gems $(DOT_WAIT)
 	$(ACTIONS_ENDGROUP)
+yes-test-bundled-gems-prepare: yes-test-bundled-gems-precheck $(DOT_WAIT)
+yes-test-bundled-gems-prepare: yes-install-for-test-bundled-gems $(DOT_WAIT)
+yes-test-bundled-gems-prepare: yes-test-bundled-gems-fetch $(DOT_WAIT)
+yes-test-bundled-gems-precheck: Preparing-test-bundled-gems
+yes-install-for-test-bundled-gems: Preparing-test-bundled-gems
+yes-test-bundled-gems-fetch: Preparing-test-bundled-gems
 
 PREPARE_BUNDLED_GEMS = test-bundled-gems-prepare
-test-bundled-gems: $(TEST_RUNNABLE)-test-bundled-gems
+test-bundled-gems: $(TEST_RUNNABLE)-test-bundled-gems $(DOT_WAIT) $(TEST_RUNNABLE)-test-bundled-gems-spec
 yes-test-bundled-gems: test-bundled-gems-run
 no-test-bundled-gems:
 
+bundled_gems_spec-run: install-for-test-bundled-gems
+	$(XRUBY) -C $(srcdir) .bundle/bin/rspec spec/bundled_gems_spec.rb
+
 # Override this to allow failure of specific gems on CI
 # TEST_BUNDLED_GEMS_ALLOW_FAILURES =
 
 BUNDLED_GEMS =
-test-bundled-gems-run: $(PREPARE_BUNDLED_GEMS)
-	$(Q) $(XRUBY) $(tooldir)/test-bundled-gems.rb $(BUNDLED_GEMS)
+test-bundled-gems-run: $(TEST_RUNNABLE)-test-bundled-gems-run
+yes-test-bundled-gems-run: $(PREPARE_BUNDLED_GEMS)
+	$(gnumake_recursive)$(Q) $(XRUBY) $(tooldir)/test-bundled-gems.rb $(BUNDLED_GEMS)
+no-test-bundled-gems-run: $(PREPARE_BUNDLED_GEMS)
+
+test-bundled-gems-spec: $(TEST_RUNNABLE)-test-bundled-gems-spec
+yes-test-bundled-gems-spec: yes-test-spec-precheck $(PREPARE_BUNDLED_GEMS)
+	$(ACTIONS_GROUP)
+	$(gnumake_recursive)$(Q) \
+	$(RUNRUBY) -r./$(arch)-fake -r$(tooldir)/lib/_tmpdir \
+		$(srcdir)/spec/mspec/bin/mspec run --env BUNDLED_GEMS=$(BUNDLED_GEMS) -B $(srcdir)/spec/bundled_gems.mspec \
+		$(MSPECOPT) $(SPECOPTS)
+	$(ACTIONS_ENDGROUP)
+no-test-bundled-gems-spec:
+
+
+test-syntax-suggest:
+
+check: $(DOT_WAIT) $(PREPARE_SYNTAX_SUGGEST) test-syntax-suggest
+
+RAKER = $(XRUBY) -I$(srcdir)/gems/lib$(PATH_SEPARATOR)$(srcdir)/.bundle/lib \
+	-rrubygems $(srcdir)/.bundle/bin/rake
+rake:
+	$(RAKER) $(RAKE_OPTS) $(RAKE)
 
 test-bundler-precheck: $(TEST_RUNNABLE)-test-bundler-precheck
 no-test-bundler-precheck:
-yes-test-bundler-precheck: main
+yes-test-bundler-precheck: main $(arch)-fake.rb
+yes-test-bundler-parallel-precheck: yes-test-bundler-precheck
 
+test-bundler-prepare: $(TEST_RUNNABLE)-test-bundler-prepare
 no-test-bundler-prepare: no-test-bundler-precheck
 yes-test-bundler-prepare: yes-test-bundler-precheck
 	$(ACTIONS_GROUP)
-	$(XRUBY) -C $(srcdir) -Ilib \
-		-e 'ENV["GEM_HOME"] = File.expand_path(".bundle")' \
-		-e 'ENV["BUNDLE_APP_CONFIG"] = File.expand_path(".bundle")' \
-		-e 'ENV["BUNDLE_PATH__SYSTEM"] = "true"' \
-		-e 'ENV["BUNDLE_WITHOUT"] = "lint doc"' \
-		-e 'load "spec/bundler/support/bundle.rb"' -- install --gemfile=tool/bundler/dev_gems.rb
+	$(XRUBY) -C $(srcdir) -Ilib -r./tool/lib/bundle_env.rb \
+		spec/bin/bundle install --quiet --gemfile=tool/bundler/dev_gems.rb
 	$(ACTIONS_ENDGROUP)
 
-RSPECOPTS =
+RSPECOPTS = -r formatter_overrides
 BUNDLER_SPECS =
+PREPARE_BUNDLER = $(TEST_RUNNABLE)-test-bundler-prepare
 test-bundler: $(TEST_RUNNABLE)-test-bundler
-yes-test-bundler: yes-test-bundler-prepare
-	$(XRUBY) -C $(srcdir) -Ispec/bundler .bundle/bin/rspec \
-		--require spec_helper $(RSPECOPTS) spec/bundler/$(BUNDLER_SPECS)
+yes-test-bundler: $(PREPARE_BUNDLER)
+	$(gnumake_recursive)$(XRUBY) \
+		-r./$(arch)-fake \
+		-C $(srcdir) -Ispec/bundler -Ispec/lib spec/bin/rspec \
+		-r spec_helper $(RSPECOPTS) spec/bundler/$(BUNDLER_SPECS)
 no-test-bundler:
 
 PARALLELRSPECOPTS = --runtime-log $(srcdir)/tmp/parallel_runtime_rspec.log
 test-bundler-parallel: $(TEST_RUNNABLE)-test-bundler-parallel
-yes-test-bundler-parallel: yes-test-bundler-prepare
-	$(XRUBY) \
+yes-test-bundler-parallel: $(PREPARE_BUNDLER)
+	$(gnumake_recursive)$(XRUBY) \
+		-r./$(arch)-fake \
+		-I$(srcdir)/spec/bundler \
+		-e "ruby = ENV['RUBY']" \
 		-e "ARGV[-1] = File.expand_path(ARGV[-1])" \
-		-e "exec(*ARGV)" -- \
-		$(XRUBY) -I$(srcdir)/spec/bundler \
-		-e "ENV['PARALLEL_TESTS_EXECUTABLE'] = ARGV.shift" \
+		-e "ENV['RSPEC_EXECUTABLE'] = ruby + ARGV.shift" \
 		-e "load ARGV.shift" \
-		"$(XRUBY) -C $(srcdir) -Ispec/bundler .bundle/bin/rspec" \
-		$(srcdir)/.bundle/bin/parallel_rspec \
-		-o "--require spec_helper" \
+		" -C $(srcdir) -Ispec/bundler -Ispec/lib .bundle/bin/rspec -r spec_helper" \
+		$(srcdir)/spec/bin/parallel_rspec $(RSPECOPTS) \
 		$(PARALLELRSPECOPTS) $(srcdir)/spec/bundler/$(BUNDLER_SPECS)
 no-test-bundler-parallel:
 
+# The annocheck supports ELF format binaries compiled for any OS and for any
+# architecture. It is designed to be independent of the host OS and the
+# architecture. The test-annocheck.sh requires docker or podman.
+test-annocheck: $(PROGRAM) $(LIBRUBY_SO)
+	$(tooldir)/test-annocheck.sh $(PROGRAM) $(LIBRUBY_SO)
+
 GEM = up
 sync-default-gems:
 	$(Q) $(XRUBY) -C "$(srcdir)" tool/sync_default_gems.rb $(GEM)
@@ -1458,7 +1675,7 @@ UNICODE_FILES = $(UNICODE_SRC_DATA_DIR)/UnicodeData.txt \
 		$(UNICODE_SRC_DATA_DIR)/SpecialCasing.txt \
 		$(empty)
 
-UNICODE_PROPERTY_FILES =  \
+UNICODE_PROPERTY_FILES = \
 		$(UNICODE_SRC_DATA_DIR)/Blocks.txt \
 		$(UNICODE_SRC_DATA_DIR)/DerivedAge.txt \
 		$(UNICODE_SRC_DATA_DIR)/DerivedCoreProperties.txt \
@@ -1468,7 +1685,7 @@ UNICODE_PROPERTY_FILES =  \
 		$(UNICODE_SRC_DATA_DIR)/Scripts.txt \
 		$(empty)
 
-UNICODE_AUXILIARY_FILES =  \
+UNICODE_AUXILIARY_FILES = \
 		$(UNICODE_SRC_DATA_DIR)/auxiliary/GraphemeBreakProperty.txt \
 		$(UNICODE_SRC_DATA_DIR)/auxiliary/GraphemeBreakTest.txt \
 		$(empty)
@@ -1488,61 +1705,71 @@ update-unicode: $(UNICODE_FILES) $(UNICODE_PROPERTY_FILES) \
 		$(UNICODE_AUXILIARY_FILES) $(UNICODE_UCD_EMOJI_FILES) $(UNICODE_EMOJI_FILES)
 
 CACHE_DIR = $(srcdir)/.downloaded-cache
-UNICODE_DOWNLOAD = \
+UNICODE_DOWNLOADER_ALWAYS_UPDATE = $(ALWAYS_UPDATE_UNICODE:yes=--always)
+UNICODE_DOWNLOADER = \
 	$(BASERUBY) $(tooldir)/downloader.rb \
 	    --cache-dir=$(CACHE_DIR) \
-	    --unicode-beta $(UNICODE_BETA) \
+	    --exist $(UNICODE_DOWNLOADER_ALWAYS_UPDATE:no=) \
+	    unicode --unicode-beta=$(UNICODE_BETA)
+UNICODE_DOWNLOAD = \
+	$(UNICODE_DOWNLOADER) \
 	    -d $(UNICODE_SRC_DATA_DIR) \
-	    -p $(UNICODE_VERSION)/ucd \
-	    -e $(ALWAYS_UPDATE_UNICODE:yes=-a) unicode
+	    -p $(UNICODE_VERSION)/ucd
 UNICODE_AUXILIARY_DOWNLOAD = \
-	$(BASERUBY) $(tooldir)/downloader.rb \
-	    --cache-dir=$(CACHE_DIR) \
-	    --unicode-beta $(UNICODE_BETA) \
+	$(UNICODE_DOWNLOADER) \
 	    -d $(UNICODE_SRC_DATA_DIR)/auxiliary \
-	    -p $(UNICODE_VERSION)/ucd/auxiliary \
-	    -e $(ALWAYS_UPDATE_UNICODE:yes=-a) unicode
+	    -p $(UNICODE_VERSION)/ucd/auxiliary
 UNICODE_UCD_EMOJI_DOWNLOAD = \
-	$(BASERUBY) $(tooldir)/downloader.rb \
-	    --cache-dir=$(CACHE_DIR) \
-	    --unicode-beta $(UNICODE_BETA) \
+	$(UNICODE_DOWNLOADER) \
 	    -d $(UNICODE_SRC_DATA_DIR)/emoji \
-	    -p $(UNICODE_VERSION)/ucd/emoji \
-	    -e $(ALWAYS_UPDATE_UNICODE:yes=-a) unicode
+	    -p $(UNICODE_VERSION)/ucd/emoji
 UNICODE_EMOJI_DOWNLOAD = \
-	$(BASERUBY) $(tooldir)/downloader.rb \
-	    --cache-dir=$(CACHE_DIR) \
-	    --unicode-beta $(UNICODE_BETA) \
+	$(UNICODE_DOWNLOADER) \
 	    -d $(UNICODE_SRC_EMOJI_DATA_DIR) \
-	    -p emoji/$(UNICODE_EMOJI_VERSION) \
-	    -e $(ALWAYS_UPDATE_UNICODE:yes=-a) unicode
+	    -p $(UNICODE_VERSION)/emoji
 
-$(UNICODE_FILES) $(UNICODE_PROPERTY_FILES): update-unicode-files
 update-unicode-files:
 	$(ECHO) Downloading Unicode $(UNICODE_VERSION) data and property files...
 	$(Q) $(MAKEDIRS) "$(UNICODE_SRC_DATA_DIR)"
 	$(Q) $(UNICODE_DOWNLOAD) $(UNICODE_FILES) $(UNICODE_PROPERTY_FILES)
 
-$(UNICODE_AUXILIARY_FILES): update-unicode-auxiliary-files
 update-unicode-auxiliary-files:
 	$(ECHO) Downloading Unicode $(UNICODE_VERSION) auxiliary files...
 	$(Q) $(MAKEDIRS) "$(UNICODE_SRC_DATA_DIR)/auxiliary"
 	$(Q) $(UNICODE_AUXILIARY_DOWNLOAD) $(UNICODE_AUXILIARY_FILES)
 
-$(UNICODE_UCD_EMOJI_FILES): update-unicode-ucd-emoji-files
 update-unicode-ucd-emoji-files:
 	$(ECHO) Downloading Unicode UCD emoji $(UNICODE_EMOJI_VERSION) files...
 	$(Q) $(MAKEDIRS) "$(UNICODE_SRC_DATA_DIR)/emoji"
 	$(Q) $(UNICODE_UCD_EMOJI_DOWNLOAD) $(UNICODE_UCD_EMOJI_FILES)
 
-$(UNICODE_EMOJI_FILES): update-unicode-emoji-files
 update-unicode-emoji-files:
 	$(ECHO) Downloading Unicode emoji $(UNICODE_EMOJI_VERSION) files...
 	$(Q) $(MAKEDIRS) "$(UNICODE_SRC_EMOJI_DATA_DIR)"
 	$(Q) $(UNICODE_EMOJI_DOWNLOAD) $(UNICODE_EMOJI_FILES)
 
-$(srcdir)/lib/unicode_normalize/$(ALWAYS_UPDATE_UNICODE:yes=tables.rb): \
-	$(UNICODE_SRC_DATA_DIR)/$(HAVE_BASERUBY:yes=.unicode-tables.time)
+$(UNICODE_FILES) $(UNICODE_PROPERTY_FILES):
+	$(ECHO) Downloading Unicode $(UNICODE_VERSION) data and property files...
+	$(Q) $(MAKEDIRS) "$(UNICODE_SRC_DATA_DIR)"
+	$(Q) $(UNICODE_DOWNLOAD) $@
+
+$(UNICODE_AUXILIARY_FILES):
+	$(ECHO) Downloading Unicode $(UNICODE_VERSION) auxiliary files...
+	$(Q) $(MAKEDIRS) "$(UNICODE_SRC_DATA_DIR)/auxiliary"
+	$(Q) $(UNICODE_AUXILIARY_DOWNLOAD) $@
+
+$(UNICODE_UCD_EMOJI_FILES):
+	$(ECHO) Downloading Unicode UCD emoji $(UNICODE_EMOJI_VERSION) files...
+	$(Q) $(MAKEDIRS) "$(UNICODE_SRC_DATA_DIR)/emoji"
+	$(Q) $(UNICODE_UCD_EMOJI_DOWNLOAD) $@
+
+$(UNICODE_EMOJI_FILES):
+	$(ECHO) Downloading Unicode emoji $(UNICODE_EMOJI_VERSION) files...
+	$(Q) $(MAKEDIRS) "$(UNICODE_SRC_EMOJI_DATA_DIR)"
+	$(Q) $(UNICODE_EMOJI_DOWNLOAD) $@
+
+$(srcdir)/lib/unicode_normalize/$(HAVE_BASERUBY:yes=tables.rb): \
+	$(UNICODE_SRC_DATA_DIR)/.unicode-tables.time
 
 $(UNICODE_SRC_DATA_DIR)/$(ALWAYS_UPDATE_UNICODE:yes=.unicode-tables.time): \
 	$(UNICODE_FILES) $(UNICODE_PROPERTY_FILES) \
@@ -1550,13 +1777,25 @@ $(UNICODE_SRC_DATA_DIR)/$(ALWAYS_UPDATE_UNICODE:yes=.unicode-tables.time): \
 
 touch-unicode-files:
 	$(MAKEDIRS) $(UNICODE_SRC_DATA_DIR)
-	touch $(UNICODE_SRC_DATA_DIR)/.unicode-tables.time $(UNICODE_DATA_HEADERS)
+	$(Q) $(TOUCH) $(UNICODE_SRC_DATA_DIR)/.unicode-tables.time $(UNICODE_DATA_HEADERS)
 
+UNICODE_TABLES_DATA_FILES = \
+	$(UNICODE_SRC_DATA_DIR)/UnicodeData.txt \
+	$(UNICODE_SRC_DATA_DIR)/CompositionExclusions.txt \
+	$(empty)
+
+UNICODE_TABLES_DEPENDENTS_1 = none$(ALWAYS_UPDATE_UNICODE)
+UNICODE_TABLES_DEPENDENTS = $(UNICODE_TABLES_DEPENDENTS_1:noneyes=force)
 UNICODE_TABLES_TIMESTAMP = yes
-$(UNICODE_SRC_DATA_DIR)/.unicode-tables.time: $(tooldir)/generic_erb.rb \
+$(UNICODE_SRC_DATA_DIR)/.unicode-tables.$(UNICODE_TABLES_DEPENDENTS:none=time):
+	$(Q) $(MAKEDIRS) $(@D)
+	$(Q) exit > $(@) || $(NULLCMD)
+$(UNICODE_SRC_DATA_DIR)/.unicode-tables.$(UNICODE_TABLES_DEPENDENTS:force=time): \
+		$(tooldir)/generic_erb.rb \
 		$(srcdir)/template/unicode_norm_gen.tmpl \
-		$(ALWAYS_UPDATE_UNICODE:yes=update-unicode)
-	$(Q) $(MAKE) $(@D)
+		$(UNICODE_TABLES_DATA_FILES) \
+	$(order_only) \
+		$(UNICODE_SRC_DATA_DIR)
 	$(Q) $(BASERUBY) $(tooldir)/generic_erb.rb \
 		-c $(UNICODE_TABLES_TIMESTAMP:yes=-t$@) \
 		-o $(srcdir)/lib/unicode_normalize/tables.rb \
@@ -1581,20 +1820,30 @@ $(UNICODE_HDR_DIR)/name2ctype.h:
 		$(UNICODE_SRC_DATA_DIR) $(UNICODE_SRC_EMOJI_DATA_DIR) > $@.new
 	$(MV) $@.new $@
 
+srcs-doc: $(srcdir)/doc/language/regexp/unicode_properties.rdoc
+$(srcdir)/doc/language/regexp/$(ALWAYS_UPDATE_UNICODE:yes=unicode_properties.rdoc): \
+	$(UNICODE_HDR_DIR)/name2ctype.h $(UNICODE_PROPERTY_FILES)
+
+$(srcdir)/doc/language/regexp/unicode_properties.rdoc:
+	$(Q) $(BOOTSTRAPRUBY) $(tooldir)/generic_erb.rb -c -o $@ \
+		$(srcdir)/template/unicode_properties.rdoc.tmpl \
+		$(UNICODE_SRC_DATA_DIR) $(UNICODE_HDR_DIR)/name2ctype.h || \
+	$(TOUCH) $@
+
 # the next non-comment line was:
-# $(UNICODE_HDR_DIR)/casefold.h: $(srcdir)/enc/unicode/case-folding.rb \
+# $(UNICODE_HDR_DIR)/casefold.h: $(tooldir)/enc-case-folding.rb \
 # but was changed to make sure CI works on systems that don't have gperf
 unicode-up: $(UNICODE_DATA_HEADERS)
 
 $(UNICODE_HDR_DIR)/$(ALWAYS_UPDATE_UNICODE:yes=casefold.h): \
-		$(srcdir)/enc/unicode/case-folding.rb \
+		$(tooldir)/enc-case-folding.rb \
 		$(UNICODE_SRC_DATA_DIR)/UnicodeData.txt \
 		$(UNICODE_SRC_DATA_DIR)/SpecialCasing.txt \
 		$(UNICODE_SRC_DATA_DIR)/CaseFolding.txt
 
 $(UNICODE_HDR_DIR)/casefold.h:
 	$(MAKEDIRS) $(@D)
-	$(Q) $(BASERUBY) $(srcdir)/enc/unicode/case-folding.rb \
+	$(Q) $(BASERUBY) $(tooldir)/enc-case-folding.rb \
 		--output-file=$@ \
 		--mapping-data-directory=$(UNICODE_SRC_DATA_DIR)
 
@@ -1612,6 +1861,9 @@ clean-gems:
 
 CLEAN_CACHE = clean-extlibs
 
+prepare-package: prereq after-update
+clean-cache: $(CLEAN_CACHE)
+
 info: info-program info-libruby_a info-libruby_so info-arch
 info-program: PHONY
 	@echo PROGRAM=$(PROGRAM)
@@ -1623,6 +1875,9 @@ info-arch: PHONY
 	@echo arch=$(arch)
 
 exam: check
+exam: $(DOT_WAIT) test-bundler-parallel
+exam: $(DOT_WAIT) bundled_gems_spec-run
+exam: $(DOT_WAIT) test-bundled-gems
 
 love: sudo-precheck up all test exam install
 	@echo love is all you need
@@ -1644,16129 +1899,102 @@ update-man-date: PHONY
 ChangeLog:
 	$(ECHO) Generating $@
 	-$(Q) $(BASERUBY) -I"$(tooldir)/lib" -rvcs \
-	-e 'VCS.detect(ARGV[0]).export_changelog("@", nil, nil, ARGV[1])' \
+	-e 'VCS.detect(ARGV[0]).export_changelog(path: ARGV[1])' \
 	"$(srcdir)" $@
 
+# CAUTION: If using GNU make 3 which does not support `.WAIT`, this
+# recipe with multiple jobs makes build and `git reset` run
+# simultaneously, and will cause inconsistent results.  Run with `-j1`
+# or update GNU make.
+nightly: yesterday $(DOT_WAIT) install
+	$(NULLCMD)
+
+# Rewind to the last commit "yesterday".  "Yesterday" means here the
+# period where `RUBY_RELEASE_DATE` is the day before the date to be
+# generated now.  In short, the yesterday in JST-9 time zone.
+yesterday: rewindable
+
+rewindable:
+	$(GIT_IN_SRC) status --porcelain
+	$(GIT_IN_SRC) diff --quiet
+
 HELP_EXTRA_TASKS = ""
 
+gc/Makefile:
+	$(MAKEDIRS) $(@D)
+	$(MESSAGE_BEGIN) \
+	"all:" \
+	"	@echo You must specify MODULAR_GC with the GC to build" \
+	"	@exit 1" \
+	$(MESSAGE_END) > $@
+gc/distclean gc/realclean::
+	-$(Q) $(RM) gc/Makefile
+
+modular-gc-precheck:
+modular-gc: probes.h gc/Makefile
+	$(Q) $(RUNRUBY) $(srcdir)/ext/extmk.rb \
+		$(SCRIPT_ARGS) \
+		--make='$(MAKE)' --make-flags="V=$(V) MINIRUBY='$(MINIRUBY)'" \
+		--gnumake=$(gnumake) --extflags="$(EXTLDFLAGS)" \
+		--ext-build-dir=gc --command-output=gc/$(MODULAR_GC)/exts.mk -- \
+		configure gc/$(MODULAR_GC)
+	$(CHDIR) gc/$(MODULAR_GC) && $(exec) $(MAKE) TARGET_SO_DIR=./
+install-modular-gc: modular-gc modular-gc-precheck
+	$(Q) $(MAKEDIRS) $(modular_gc_dir)
+	$(CP) gc/$(MODULAR_GC)/librubygc.$(MODULAR_GC).$(DLEXT) $(modular_gc_dir)
+
+clean-modular-gc: gc/clean
+distclean-modular-gc: gc/distclean
+realclean-modular-gc: gc/realclean
+distclean-modular-gc realclean-modular-gc:
+	-$(Q) $(RMDIR) gc
+
 help: PHONY
 	$(MESSAGE_BEGIN) \
 	"                Makefile of Ruby" \
 	"" \
 	"targets:" \
-	"  all (default):       builds all of below" \
-	"  miniruby:            builds only miniruby" \
-	"  encs:                builds encodings" \
-	"  exts:                builds extensions" \
-	"  main:                builds encodings, extensions and ruby" \
-	"  docs:                builds documents" \
-	"  install-capi:        builds C API documents" \
-	"  run:                 runs test.rb by miniruby" \
-	"  runruby:             runs test.rb by ruby you just built" \
-	"  gdb:                 runs test.rb by miniruby under gdb" \
-	"  gdb-ruby:            runs test.rb by ruby under gdb" \
-	"  check:               equals make test test-tool test-all test-spec" \
-	"  test:                ruby core tests [BTESTS=<bootstraptest files>]" \
-	"  test-all:            all ruby tests [TESTOPTS=-j4 TESTS=<test files>]" \
-	"  test-spec:           run the Ruby spec suite [SPECOPTS=<specs, opts>]" \
-	"  test-bundler:        run the Bundler spec" \
-	"  test-bundled-gems:   run the test suite of bundled gems" \
-	"  test-tool:           tests under the tool/test" \
-	"  update-gems:         download files of the bundled gems" \
-	"  update-bundled_gems: update the latest version of bundled gems" \
-	"  sync-default-gems:   sync default gems from upstream [GEM=<gem_name git_ref>]" \
-	"  up:                  update local copy and autogenerated files" \
-	"  benchmark:           benchmark this ruby and COMPARE_RUBY." \
-	"  gcbench:             gc benchmark [GCBENCH_ITEM=<item_name>]" \
-	"  install:             install all ruby distributions" \
-	"  install-nodoc:       install without rdoc" \
-	"  install-cross:       install cross compiling stuff" \
-	"  clean:               clean for tarball" \
-	"  distclean:           clean for repository" \
-	"  golf:                build goruby for golfers" \
+	"  all (default):         builds all of below" \
+	"  miniruby:              builds only miniruby" \
+	"  encs:                  builds encodings" \
+	"  exts:                  builds extensions" \
+	"  main:                  builds encodings, extensions and ruby" \
+	"  docs:                  builds documents" \
+	"  install-capi:          builds C API documents" \
+	"  run:                   runs test.rb by miniruby" \
+	"  runruby:               runs test.rb by ruby you just built" \
+	"  gdb:                   runs test.rb by miniruby under gdb" \
+	"  gdb-ruby:              runs test.rb by ruby under gdb" \
+	"  runirb:                starts irb on built ruby (not installed ruby)" \
+	"  exam:                  equals make check test-bundler-parallel test-bundled-gems" \
+	"  check:                 equals make test test-tool test-all test-spec test-syntax-suggest" \
+	"  test:                  ruby core tests [BTESTS=<bootstraptest files>]" \
+	"  test-all:              all ruby tests [TESTOPTS=-j4 TESTS=<test files>]" \
+	"  test-spec:             run the Ruby spec suite [SPECOPTS=<specs, opts>]" \
+	"  test-bundler:          run the Bundler spec" \
+	"  test-bundler-parallel: run the Bundler spec with parallel" \
+	"  test-syntax-suggest:   run the SyntaxSuggest spec" \
+	"  test-bundled-gems:     run the test suite of bundled gems [BUNDLED_GEMS=<gems>]" \
+	"  test-tool:             tests under the tool/test" \
+	"  update-gems:           download files of the bundled gems" \
+	"  update-bundled_gems:   update the latest version of bundled gems" \
+	"  sync-default-gems:     sync default gems from upstream [GEM=<gem_name git_ref>]" \
+	"  up:                    update local copy and autogenerated files" \
+	"  benchmark:             benchmark this ruby and COMPARE_RUBY." \
+	"  gcbench:               gc benchmark [GCBENCH_ITEM=<item_name>]" \
+	"  install:               install all ruby distributions" \
+	"  install-nodoc:         install without rdoc" \
+	"  install-cross:         install cross compiling stuff" \
+	"  clean:                 clean up to the state before build" \
+	"  distclean:             clean up to the state before configure" \
+	"  golf:                  build goruby for golfers" \
 	$(HELP_EXTRA_TASKS) \
 	"see DeveloperHowto for more detail: " \
-	"  https://bugs.ruby-lang.org/projects/ruby/wiki/DeveloperHowto" \
+	"  https://github.com/ruby/ruby/wiki/Developer-How-To" \
 	$(MESSAGE_END)
 
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-yjit.$(OBJEXT): {$(VPATH)}yjit.rb
-yjit.$(OBJEXT): {$(VPATH)}yjit.rbinc
-# AUTOGENERATED DEPENDENCIES END
+$(CROSS_COMPILING:yes=)builtin.$(OBJEXT): {$(VPATH)}mini_builtin.c
+$(CROSS_COMPILING:yes=)builtin.$(OBJEXT): {$(VPATH)}miniprelude.c
+
+!include $(srcdir)/prism/srcs.mk
+!include $(srcdir)/depend
diff --git a/compar.c b/compar.c
index 9f47a3fa62..142cb12a0c 100644
--- a/compar.c
+++ b/compar.c
@@ -30,13 +30,13 @@ rb_cmperr(VALUE x, VALUE y)
     VALUE classname;
 
     if (SPECIAL_CONST_P(y) || BUILTIN_TYPE(y) == T_FLOAT) {
-	classname = rb_inspect(y);
+        classname = rb_inspect(y);
     }
     else {
-	classname = rb_obj_class(y);
+        classname = rb_obj_class(y);
     }
     rb_raise(rb_eArgError, "comparison of %"PRIsVALUE" with %"PRIsVALUE" failed",
-	     rb_obj_class(x), classname);
+             rb_obj_class(x), classname);
 }
 
 static VALUE
@@ -50,12 +50,12 @@ VALUE
 rb_invcmp(VALUE x, VALUE y)
 {
     VALUE invcmp = rb_exec_recursive(invcmp_recursive, x, y);
-    if (invcmp == Qundef || NIL_P(invcmp)) {
-	return Qnil;
+    if (NIL_OR_UNDEF_P(invcmp)) {
+        return Qnil;
     }
     else {
-	int result = -rb_cmpint(invcmp, x, y);
-	return INT2FIX(result);
+        int result = -rb_cmpint(invcmp, x, y);
+        return INT2FIX(result);
     }
 }
 
@@ -95,10 +95,13 @@ cmpint(VALUE x, VALUE y)
 
 /*
  *  call-seq:
- *     obj > other    -> true or false
+ *    self > other -> true or false
  *
- *  Compares two objects based on the receiver's <code><=></code>
- *  method, returning true if it returns a value greater than 0.
+ *  Returns whether +self+ is "greater than" +other+;
+ *  equivalent to <tt>(self <=> other) > 0</tt>:
+ *
+ *    'foo' > 'foo'  # => false
+ *    'food' > 'foo' # => true
  */
 
 static VALUE
@@ -109,10 +112,15 @@ cmp_gt(VALUE x, VALUE y)
 
 /*
  *  call-seq:
- *     obj >= other    -> true or false
+ *    self >= other -> true or false
+ *
+ *  Returns whether +self+ is "greater than or equal to" +other+;
+ *  equivalent to <tt>(self <=> other) >= 0</tt>:
+ *
+ *    'food' >= 'foo'  # => true
+ *    'foo'  >= 'foo'  # => true
+ *    'foo'  >= 'food' # => false
  *
- *  Compares two objects based on the receiver's <code><=></code>
- *  method, returning true if it returns a value greater than or equal to 0.
  */
 
 static VALUE
@@ -123,10 +131,14 @@ cmp_ge(VALUE x, VALUE y)
 
 /*
  *  call-seq:
- *     obj < other    -> true or false
+ *    self < other -> true or false
+ *
+ *  Returns whether +self+ is "less than" +other+;
+ *  equivalent to <tt>(self <=> other) < 0</tt>:
+ *
+ *    'foo' < 'foo'  # => false
+ *    'foo' < 'food' # => true
  *
- *  Compares two objects based on the receiver's <code><=></code>
- *  method, returning true if it returns a value less than 0.
  */
 
 static VALUE
@@ -137,10 +149,15 @@ cmp_lt(VALUE x, VALUE y)
 
 /*
  *  call-seq:
- *     obj <= other    -> true or false
+ *    self <= other -> true or false
+ *
+ *  Returns whether +self+ is "less than or equal to" +other+;
+ *  equivalent to <tt>(self <=> other) <= 0</tt>:
+ *
+ *    'foo' <= 'foo'  # => true
+ *    'foo' <= 'food' # => true
+ *    'food' <= 'foo' # => false
  *
- *  Compares two objects based on the receiver's <code><=></code>
- *  method, returning true if it returns a value less than or equal to 0.
  */
 
 static VALUE
@@ -167,9 +184,7 @@ cmp_le(VALUE x, VALUE y)
 static VALUE
 cmp_between(VALUE x, VALUE min, VALUE max)
 {
-    if (cmpint(x, min) < 0) return Qfalse;
-    if (cmpint(x, max) > 0) return Qfalse;
-    return Qtrue;
+    return RBOOL((cmpint(x, min) >= 0 && cmpint(x, max) <= 0));
 }
 
 /*
@@ -189,6 +204,12 @@ cmp_between(VALUE x, VALUE min, VALUE max)
  *     'd'.clamp('a', 'f')      #=> 'd'
  *     'z'.clamp('a', 'f')      #=> 'f'
  *
+ * If _min_ is +nil+, it is considered smaller than _obj_,
+ * and if _max_ is +nil+, it is considered greater than _obj_.
+ *
+ *     -20.clamp(0, nil)           #=> 0
+ *     523.clamp(nil, 100)         #=> 100
+ *
  * In <code>(range)</code> form, returns _range.begin_ if _obj_
  * <code><=></code> _range.begin_ is less than zero, _range.end_
  * if _obj_ <code><=></code> _range.end_ is greater than zero, and
@@ -231,7 +252,7 @@ cmp_clamp(int argc, VALUE *argv, VALUE x)
         }
     }
     if (!NIL_P(min) && !NIL_P(max) && cmpint(min, max) > 0) {
-	rb_raise(rb_eArgError, "min argument must be smaller than max argument");
+        rb_raise(rb_eArgError, "min argument must be less than or equal to max argument");
     }
 
     if (!NIL_P(min)) {
@@ -259,25 +280,28 @@ cmp_clamp(int argc, VALUE *argv, VALUE x)
  *  <code>==</code>, <code>>=</code>, and <code>></code>) and the
  *  method <code>between?</code>.
  *
- *     class SizeMatters
+ *     class StringSorter
  *       include Comparable
+ *
  *       attr :str
  *       def <=>(other)
  *         str.size <=> other.str.size
  *       end
+ *
  *       def initialize(str)
  *         @str = str
  *       end
+ *
  *       def inspect
  *         @str
  *       end
  *     end
  *
- *     s1 = SizeMatters.new("Z")
- *     s2 = SizeMatters.new("YY")
- *     s3 = SizeMatters.new("XXX")
- *     s4 = SizeMatters.new("WWWW")
- *     s5 = SizeMatters.new("VVVVV")
+ *     s1 = StringSorter.new("Z")
+ *     s2 = StringSorter.new("YY")
+ *     s3 = StringSorter.new("XXX")
+ *     s4 = StringSorter.new("WWWW")
+ *     s5 = StringSorter.new("VVVVV")
  *
  *     s1 < s2                       #=> true
  *     s4.between?(s1, s3)           #=> false
@@ -286,13 +310,13 @@ cmp_clamp(int argc, VALUE *argv, VALUE x)
  *
  *  == What's Here
  *
- *  \Module \Comparable provides these methods, all of which use method <tt><=></tt>:
+ *  Module \Comparable provides these methods, all of which use method <tt>#<=></tt>:
  *
  *  - #<: Returns whether +self+ is less than the given object.
  *  - #<=: Returns whether +self+ is less than or equal to the given object.
  *  - #==: Returns whether +self+ is equal to the given object.
- *  - #>: Returns whether +self+ is greater than or equal to the given object.
- *  - #>=: Returns whether +self+ is greater than the given object.
+ *  - #>: Returns whether +self+ is greater than the given object.
+ *  - #>=: Returns whether +self+ is greater than or equal to the given object.
  *  - #between?: Returns +true+ if +self+ is between two given objects.
  *  - #clamp: For given objects +min+ and +max+, or range <tt>(min..max)</tt>, returns:
  *
diff --git a/compile.c b/compile.c
index 67641fcfb6..b7d6b07090 100644
--- a/compile.c
+++ b/compile.c
@@ -17,7 +17,6 @@
 #endif
 
 #include "encindex.h"
-#include "gc.h"
 #include "id_table.h"
 #include "internal.h"
 #include "internal/array.h"
@@ -25,37 +24,38 @@
 #include "internal/complex.h"
 #include "internal/encoding.h"
 #include "internal/error.h"
+#include "internal/gc.h"
 #include "internal/hash.h"
+#include "internal/io.h"
 #include "internal/numeric.h"
 #include "internal/object.h"
 #include "internal/rational.h"
 #include "internal/re.h"
+#include "internal/ruby_parser.h"
 #include "internal/symbol.h"
 #include "internal/thread.h"
 #include "internal/variable.h"
 #include "iseq.h"
+#include "ruby/ractor.h"
 #include "ruby/re.h"
 #include "ruby/util.h"
 #include "vm_core.h"
 #include "vm_callinfo.h"
 #include "vm_debug.h"
+#include "yjit.h"
 
 #include "builtin.h"
 #include "insns.inc"
 #include "insns_info.inc"
 
-#undef RUBY_UNTYPED_DATA_WARNING
-#define RUBY_UNTYPED_DATA_WARNING 0
-
 #define FIXNUM_INC(n, i) ((n)+(INT2FIX(i)&~FIXNUM_FLAG))
-#define FIXNUM_OR(n, i) ((n)|INT2FIX(i))
 
 typedef struct iseq_link_element {
     enum {
-	ISEQ_ELEMENT_ANCHOR,
-	ISEQ_ELEMENT_LABEL,
-	ISEQ_ELEMENT_INSN,
-	ISEQ_ELEMENT_ADJUST,
+        ISEQ_ELEMENT_ANCHOR,
+        ISEQ_ELEMENT_LABEL,
+        ISEQ_ELEMENT_INSN,
+        ISEQ_ELEMENT_ADJUST,
         ISEQ_ELEMENT_TRACE,
     } type;
     struct iseq_link_element *next;
@@ -93,9 +93,9 @@ typedef struct iseq_insn_data {
     int sc_state;
     VALUE *operands;
     struct {
-	int line_no;
+        int line_no;
         int node_id;
-	rb_event_flag_t events;
+        rb_event_flag_t events;
     } insn_info;
 } INSN;
 
@@ -118,7 +118,7 @@ struct ensure_range {
 };
 
 struct iseq_compile_data_ensure_node_stack {
-    const NODE *ensure_node;
+    const void *ensure_node;
     struct iseq_compile_data_ensure_node_stack *prev;
     struct ensure_range *erange;
 };
@@ -213,36 +213,43 @@ const ID rb_iseq_shared_exc_local_tbl[] = {idERROR_INFO};
 #define NEW_CHILD_ISEQ(node, name, type, line_no) \
   new_child_iseq(iseq, (node), rb_fstring(name), iseq, (type), (line_no))
 
+#define NEW_CHILD_ISEQ_WITH_CALLBACK(callback_func, name, type, line_no) \
+  new_child_iseq_with_callback(iseq, (callback_func), (name), iseq, (type), (line_no))
+
 /* add instructions */
 #define ADD_SEQ(seq1, seq2) \
   APPEND_LIST((seq1), (seq2))
 
 /* add an instruction */
 #define ADD_INSN(seq, line_node, insn) \
-  ADD_ELEM((seq), (LINK_ELEMENT *) new_insn_body(iseq, (line_node), BIN(insn), 0))
+  ADD_ELEM((seq), (LINK_ELEMENT *) new_insn_body(iseq, nd_line(line_node), nd_node_id(line_node), BIN(insn), 0))
+
+/* add an instruction with the given line number and node id */
+#define ADD_SYNTHETIC_INSN(seq, line_no, node_id, insn) \
+  ADD_ELEM((seq), (LINK_ELEMENT *) new_insn_body(iseq, (line_no), (node_id), BIN(insn), 0))
 
 /* insert an instruction before next */
-#define INSERT_BEFORE_INSN(next, line_node, insn) \
-  ELEM_INSERT_PREV(&(next)->link, (LINK_ELEMENT *) new_insn_body(iseq, (line_node), BIN(insn), 0))
+#define INSERT_BEFORE_INSN(next, line_no, node_id, insn) \
+  ELEM_INSERT_PREV(&(next)->link, (LINK_ELEMENT *) new_insn_body(iseq, line_no, node_id, BIN(insn), 0))
 
 /* insert an instruction after prev */
-#define INSERT_AFTER_INSN(prev, line_node, insn) \
-  ELEM_INSERT_NEXT(&(prev)->link, (LINK_ELEMENT *) new_insn_body(iseq, (line_node), BIN(insn), 0))
+#define INSERT_AFTER_INSN(prev, line_no, node_id, insn) \
+  ELEM_INSERT_NEXT(&(prev)->link, (LINK_ELEMENT *) new_insn_body(iseq, line_no, node_id, BIN(insn), 0))
 
 /* add an instruction with some operands (1, 2, 3, 5) */
 #define ADD_INSN1(seq, line_node, insn, op1) \
   ADD_ELEM((seq), (LINK_ELEMENT *) \
-           new_insn_body(iseq, (line_node), BIN(insn), 1, (VALUE)(op1)))
+           new_insn_body(iseq, nd_line(line_node), nd_node_id(line_node), BIN(insn), 1, (VALUE)(op1)))
 
 /* insert an instruction with some operands (1, 2, 3, 5) before next */
-#define INSERT_BEFORE_INSN1(next, line_node, insn, op1) \
+#define INSERT_BEFORE_INSN1(next, line_no, node_id, insn, op1) \
   ELEM_INSERT_PREV(&(next)->link, (LINK_ELEMENT *) \
-           new_insn_body(iseq, (line_node), BIN(insn), 1, (VALUE)(op1)))
+           new_insn_body(iseq, line_no, node_id, BIN(insn), 1, (VALUE)(op1)))
 
 /* insert an instruction with some operands (1, 2, 3, 5) after prev */
-#define INSERT_AFTER_INSN1(prev, line_node, insn, op1) \
+#define INSERT_AFTER_INSN1(prev, line_no, node_id, insn, op1) \
   ELEM_INSERT_NEXT(&(prev)->link, (LINK_ELEMENT *) \
-           new_insn_body(iseq, (line_node), BIN(insn), 1, (VALUE)(op1)))
+           new_insn_body(iseq, line_no, node_id, BIN(insn), 1, (VALUE)(op1)))
 
 #define LABEL_REF(label) ((label)->refcnt++)
 
@@ -251,11 +258,11 @@ const ID rb_iseq_shared_exc_local_tbl[] = {idERROR_INFO};
 
 #define ADD_INSN2(seq, line_node, insn, op1, op2) \
   ADD_ELEM((seq), (LINK_ELEMENT *) \
-           new_insn_body(iseq, (line_node), BIN(insn), 2, (VALUE)(op1), (VALUE)(op2)))
+           new_insn_body(iseq, nd_line(line_node), nd_node_id(line_node), BIN(insn), 2, (VALUE)(op1), (VALUE)(op2)))
 
 #define ADD_INSN3(seq, line_node, insn, op1, op2, op3) \
   ADD_ELEM((seq), (LINK_ELEMENT *) \
-           new_insn_body(iseq, (line_node), BIN(insn), 3, (VALUE)(op1), (VALUE)(op2), (VALUE)(op3)))
+           new_insn_body(iseq, nd_line(line_node), nd_node_id(line_node), BIN(insn), 3, (VALUE)(op1), (VALUE)(op2), (VALUE)(op3)))
 
 /* Specific Insn factory */
 #define ADD_SEND(seq, line_node, id, argc) \
@@ -277,7 +284,7 @@ const ID rb_iseq_shared_exc_local_tbl[] = {idERROR_INFO};
   ADD_SEND_R((seq), (line_node), (id), (argc), (block), (VALUE)INT2FIX(VM_CALL_FCALL), NULL)
 
 #define ADD_SEND_R(seq, line_node, id, argc, block, flag, keywords) \
-  ADD_ELEM((seq), (LINK_ELEMENT *) new_insn_send(iseq, (line_node), (id), (VALUE)(argc), (block), (VALUE)(flag), (keywords)))
+  ADD_ELEM((seq), (LINK_ELEMENT *) new_insn_send(iseq, nd_line(line_node), nd_node_id(line_node), (id), (VALUE)(argc), (block), (VALUE)(flag), (keywords)))
 
 #define ADD_TRACE(seq, event) \
   ADD_ELEM((seq), (LINK_ELEMENT *)new_trace_body(iseq, (event), 0))
@@ -307,13 +314,13 @@ static void iseq_add_setlocal(rb_iseq_t *iseq, LINK_ANCHOR *const seq, const NOD
     ((label) ? (LABEL_REF(label), (label)->unremovable=1) : 0)
 #define ADD_CATCH_ENTRY(type, ls, le, iseqv, lc) do {				\
     VALUE _e = rb_ary_new3(5, (type),						\
-			   (VALUE)(ls) | 1, (VALUE)(le) | 1,			\
-			   (VALUE)(iseqv), (VALUE)(lc) | 1);			\
+                           (VALUE)(ls) | 1, (VALUE)(le) | 1,			\
+                           (VALUE)(iseqv), (VALUE)(lc) | 1);			\
     LABEL_UNREMOVABLE(ls);							\
     LABEL_REF(le);								\
     LABEL_REF(lc);								\
     if (NIL_P(ISEQ_COMPILE_DATA(iseq)->catch_table_ary)) \
-        RB_OBJ_WRITE(iseq, &ISEQ_COMPILE_DATA(iseq)->catch_table_ary, rb_ary_tmp_new(3)); \
+        RB_OBJ_WRITE(iseq, &ISEQ_COMPILE_DATA(iseq)->catch_table_ary, rb_ary_hidden_new(3)); \
     rb_ary_push(ISEQ_COMPILE_DATA(iseq)->catch_table_ary, freeze_hide_obj(_e));	\
 } while (0)
 
@@ -332,10 +339,10 @@ static void iseq_add_setlocal(rb_iseq_t *iseq, LINK_ANCHOR *const seq, const NOD
   (debug_compile("== " desc "\n", \
                  iseq_compile_each(iseq, (anchor), (node), (popped))))
 
-#define COMPILE_RECV(anchor, desc, node) \
+#define COMPILE_RECV(anchor, desc, node, recv) \
     (private_recv_p(node) ? \
      (ADD_INSN(anchor, node, putself), VM_CALL_FCALL) : \
-     COMPILE(anchor, desc, node->nd_recv) ? 0 : -1)
+     COMPILE(anchor, desc, recv) ? 0 : -1)
 
 #define OPERAND_AT(insn, idx) \
   (((INSN*)(insn))->operands[(idx)])
@@ -368,11 +375,11 @@ append_compile_error(const rb_iseq_t *iseq, int line, const char *fmt, ...)
     err = rb_syntax_error_append(err, file, line, -1, NULL, fmt, args);
     va_end(args);
     if (NIL_P(err_info)) {
-	RB_OBJ_WRITE(iseq, &ISEQ_COMPILE_DATA(iseq)->err_info, err);
-	rb_set_errinfo(err);
+        RB_OBJ_WRITE(iseq, &ISEQ_COMPILE_DATA(iseq)->err_info, err);
+        rb_set_errinfo(err);
     }
     else if (!err_info) {
-	RB_OBJ_WRITE(iseq, &ISEQ_COMPILE_DATA(iseq)->err_info, Qtrue);
+        RB_OBJ_WRITE(iseq, &ISEQ_COMPILE_DATA(iseq)->err_info, Qtrue);
     }
     if (compile_debug) {
         if (SPECIAL_CONST_P(err)) err = rb_eSyntaxError;
@@ -402,17 +409,17 @@ do { \
     const NODE *error_node = (node); \
     enum node_type error_type = nd_type(error_node); \
     if (error_type != (ndtype)) { \
-	COMPILE_ERROR(ERROR_ARGS_AT(error_node) \
-		      prefix ": " #ndtype " is expected, but %s", \
-		      ruby_node_name(error_type)); \
-	return errval; \
+        COMPILE_ERROR(ERROR_ARGS_AT(error_node) \
+                      prefix ": " #ndtype " is expected, but %s", \
+                      ruby_node_name(error_type)); \
+        return errval; \
     } \
 } while (0)
 
 #define EXPECT_NODE_NONULL(prefix, parent, ndtype, errval) \
 do { \
     COMPILE_ERROR(ERROR_ARGS_AT(parent) \
-		  prefix ": must be " #ndtype ", but 0"); \
+                  prefix ": must be " #ndtype ", but 0"); \
     return errval; \
 } while (0)
 
@@ -420,7 +427,7 @@ do { \
 do { \
     const NODE *error_node = (node); \
     COMPILE_ERROR(ERROR_ARGS_AT(error_node) prefix ": unknown node (%s)", \
-		  ruby_node_name(nd_type(error_node))); \
+                  ruby_node_name(nd_type(error_node))); \
     return errval; \
 } while (0)
 
@@ -431,12 +438,10 @@ do { \
 #define NO_CHECK(sub) (void)(sub)
 #define BEFORE_RETURN
 
-/* leave name uninitialized so that compiler warn if INIT_ANCHOR is
- * missing */
 #define DECL_ANCHOR(name) \
-    LINK_ANCHOR name[1] = {{{ISEQ_ELEMENT_ANCHOR,},}}
+    LINK_ANCHOR name[1] = {{{ISEQ_ELEMENT_ANCHOR,},&name[0].anchor}}
 #define INIT_ANCHOR(name) \
-    (name->last = &name->anchor)
+    ((name->last = &name->anchor)->next = NULL) /* re-initialize */
 
 static inline VALUE
 freeze_hide_obj(VALUE obj)
@@ -470,7 +475,7 @@ static void dump_disasm_list(const LINK_ELEMENT *elem);
 static int insn_data_length(INSN *iobj);
 static int calc_sp_depth(int depth, INSN *iobj);
 
-static INSN *new_insn_body(rb_iseq_t *iseq, const NODE *const line_node, enum ruby_vminsn_type insn_id, int argc, ...);
+static INSN *new_insn_body(rb_iseq_t *iseq, int line_no, int node_id, enum ruby_vminsn_type insn_id, int argc, ...);
 static LABEL *new_label_body(rb_iseq_t *iseq, long line);
 static ADJUST *new_adjust_body(rb_iseq_t *iseq, LABEL *label, int line);
 static TRACE *new_trace_body(rb_iseq_t *iseq, rb_event_flag_t event, long data);
@@ -482,16 +487,16 @@ static int iseq_setup_insn(rb_iseq_t *iseq, LINK_ANCHOR *const anchor);
 static int iseq_optimize(rb_iseq_t *iseq, LINK_ANCHOR *const anchor);
 static int iseq_insns_unification(rb_iseq_t *iseq, LINK_ANCHOR *const anchor);
 
-static int iseq_set_local_table(rb_iseq_t *iseq, const rb_ast_id_table_t *tbl);
+static int iseq_set_local_table(rb_iseq_t *iseq, const rb_ast_id_table_t *tbl, const NODE *const node_args);
 static int iseq_set_exception_local_table(rb_iseq_t *iseq);
 static int iseq_set_arguments(rb_iseq_t *iseq, LINK_ANCHOR *const anchor, const NODE *const node);
 
-static int iseq_set_sequence_stackcaching(rb_iseq_t *iseq, LINK_ANCHOR *const anchor);
 static int iseq_set_sequence(rb_iseq_t *iseq, LINK_ANCHOR *const anchor);
 static int iseq_set_exception_table(rb_iseq_t *iseq);
 static int iseq_set_optargs_table(rb_iseq_t *iseq);
+static int iseq_set_parameters_lvar_state(const rb_iseq_t *iseq);
 
-static int compile_defined_expr(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE *const node, VALUE needstr);
+static int compile_defined_expr(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE *const node, VALUE needstr, bool ignore);
 static int compile_hash(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE *node, int method_call_keywords, int popped);
 
 /*
@@ -510,19 +515,19 @@ verify_list(ISEQ_ARG_DECLARE const char *info, LINK_ANCHOR *const anchor)
     list = anchor->anchor.next;
     plist = &anchor->anchor;
     while (list) {
-	if (plist != list->prev) {
-	    flag += 1;
-	}
-	plist = list;
-	list = list->next;
+        if (plist != list->prev) {
+            flag += 1;
+        }
+        plist = list;
+        list = list->next;
     }
 
     if (anchor->last != plist && anchor->last != 0) {
-	flag |= 0x70000;
+        flag |= 0x70000;
     }
 
     if (flag != 0) {
-	rb_bug("list verify error: %08x (%s)", flag, info);
+        rb_bug("list verify error: %08x (%s)", flag, info);
     }
 #endif
 }
@@ -606,12 +611,25 @@ branch_coverage_valid_p(rb_iseq_t *iseq, int first_line)
 }
 
 static VALUE
-decl_branch_base(rb_iseq_t *iseq, const NODE *node, const char *type)
+setup_branch(const rb_code_location_t *loc, const char *type, VALUE structure, VALUE key)
 {
-    const int first_lineno = nd_first_lineno(node), first_column = nd_first_column(node);
-    const int last_lineno = nd_last_lineno(node), last_column = nd_last_column(node);
+    const int first_lineno = loc->beg_pos.lineno, first_column = loc->beg_pos.column;
+    const int last_lineno = loc->end_pos.lineno, last_column = loc->end_pos.column;
+    VALUE branch = rb_ary_hidden_new(6);
 
-    if (!branch_coverage_valid_p(iseq, first_lineno)) return Qundef;
+    rb_hash_aset(structure, key, branch);
+    rb_ary_push(branch, ID2SYM(rb_intern(type)));
+    rb_ary_push(branch, INT2FIX(first_lineno));
+    rb_ary_push(branch, INT2FIX(first_column));
+    rb_ary_push(branch, INT2FIX(last_lineno));
+    rb_ary_push(branch, INT2FIX(last_column));
+    return branch;
+}
+
+static VALUE
+decl_branch_base(rb_iseq_t *iseq, VALUE key, const rb_code_location_t *loc, const char *type)
+{
+    if (!branch_coverage_valid_p(iseq, loc->beg_pos.lineno)) return Qundef;
 
     /*
      * if !structure[node]
@@ -622,18 +640,11 @@ decl_branch_base(rb_iseq_t *iseq, const NODE *node, const char *type)
      */
 
     VALUE structure = RARRAY_AREF(ISEQ_BRANCH_COVERAGE(iseq), 0);
-    VALUE key = (VALUE)node | 1; // FIXNUM for hash key
     VALUE branch_base = rb_hash_aref(structure, key);
     VALUE branches;
 
     if (NIL_P(branch_base)) {
-        branch_base = rb_ary_tmp_new(6);
-        rb_hash_aset(structure, key, branch_base);
-        rb_ary_push(branch_base, ID2SYM(rb_intern(type)));
-        rb_ary_push(branch_base, INT2FIX(first_lineno));
-        rb_ary_push(branch_base, INT2FIX(first_column));
-        rb_ary_push(branch_base, INT2FIX(last_lineno));
-        rb_ary_push(branch_base, INT2FIX(last_column));
+        branch_base = setup_branch(loc, type, structure, key);
         branches = rb_hash_new();
         rb_obj_hide(branches);
         rb_ary_push(branch_base, branches);
@@ -655,12 +666,9 @@ generate_dummy_line_node(int lineno, int node_id)
 }
 
 static void
-add_trace_branch_coverage(rb_iseq_t *iseq, LINK_ANCHOR *const seq, const NODE *node, int branch_id, const char *type, VALUE branches)
+add_trace_branch_coverage(rb_iseq_t *iseq, LINK_ANCHOR *const seq, const rb_code_location_t *loc, int node_id, int branch_id, const char *type, VALUE branches)
 {
-    const int first_lineno = nd_first_lineno(node), first_column = nd_first_column(node);
-    const int last_lineno = nd_last_lineno(node), last_column = nd_last_column(node);
-
-    if (!branch_coverage_valid_p(iseq, first_lineno)) return;
+    if (!branch_coverage_valid_p(iseq, loc->beg_pos.lineno)) return;
 
     /*
      * if !branches[branch_id]
@@ -675,13 +683,7 @@ add_trace_branch_coverage(rb_iseq_t *iseq, LINK_ANCHOR *const seq, const NODE *n
     long counter_idx;
 
     if (NIL_P(branch)) {
-        branch = rb_ary_tmp_new(6);
-        rb_hash_aset(branches, key, branch);
-        rb_ary_push(branch, ID2SYM(rb_intern(type)));
-        rb_ary_push(branch, INT2FIX(first_lineno));
-        rb_ary_push(branch, INT2FIX(first_column));
-        rb_ary_push(branch, INT2FIX(last_lineno));
-        rb_ary_push(branch, INT2FIX(last_column));
+        branch = setup_branch(loc, type, branches, key);
         VALUE counters = RARRAY_AREF(ISEQ_BRANCH_COVERAGE(iseq), 1);
         counter_idx = RARRAY_LEN(counters);
         rb_ary_push(branch, LONG2FIX(counter_idx));
@@ -692,9 +694,7 @@ add_trace_branch_coverage(rb_iseq_t *iseq, LINK_ANCHOR *const seq, const NODE *n
     }
 
     ADD_TRACE_WITH_DATA(seq, RUBY_EVENT_COVERAGE_BRANCH, counter_idx);
-
-    NODE dummy_line_node = generate_dummy_line_node(last_lineno, nd_node_id(node));
-    ADD_INSN(seq, &dummy_line_node, nop);
+    ADD_SYNTHETIC_INSN(seq, loc->end_pos.lineno, node_id, nop);
 }
 
 #define ISEQ_LAST_LINE(iseq) (ISEQ_COMPILE_DATA(iseq)->last_line)
@@ -705,11 +705,11 @@ validate_label(st_data_t name, st_data_t label, st_data_t arg)
     rb_iseq_t *iseq = (rb_iseq_t *)arg;
     LABEL *lobj = (LABEL *)label;
     if (!lobj->link.next) {
-	do {
-	    COMPILE_ERROR(iseq, lobj->position,
-			  "%"PRIsVALUE": undefined label",
-			  rb_sym2str((VALUE)name));
-	} while (0);
+        do {
+            COMPILE_ERROR(iseq, lobj->position,
+                          "%"PRIsVALUE": undefined label",
+                          rb_sym2str((VALUE)name));
+        } while (0);
     }
     return ST_CONTINUE;
 }
@@ -721,6 +721,129 @@ validate_labels(rb_iseq_t *iseq, st_table *labels_table)
     st_free_table(labels_table);
 }
 
+static NODE *
+get_nd_recv(const NODE *node)
+{
+    switch (nd_type(node)) {
+      case NODE_CALL:
+        return RNODE_CALL(node)->nd_recv;
+      case NODE_OPCALL:
+        return RNODE_OPCALL(node)->nd_recv;
+      case NODE_FCALL:
+        return 0;
+      case NODE_QCALL:
+        return RNODE_QCALL(node)->nd_recv;
+      case NODE_VCALL:
+        return 0;
+      case NODE_ATTRASGN:
+        return RNODE_ATTRASGN(node)->nd_recv;
+      case NODE_OP_ASGN1:
+        return RNODE_OP_ASGN1(node)->nd_recv;
+      case NODE_OP_ASGN2:
+        return RNODE_OP_ASGN2(node)->nd_recv;
+      default:
+        rb_bug("unexpected node: %s", ruby_node_name(nd_type(node)));
+    }
+}
+
+static ID
+get_node_call_nd_mid(const NODE *node)
+{
+    switch (nd_type(node)) {
+      case NODE_CALL:
+        return RNODE_CALL(node)->nd_mid;
+      case NODE_OPCALL:
+        return RNODE_OPCALL(node)->nd_mid;
+      case NODE_FCALL:
+        return RNODE_FCALL(node)->nd_mid;
+      case NODE_QCALL:
+        return RNODE_QCALL(node)->nd_mid;
+      case NODE_VCALL:
+        return RNODE_VCALL(node)->nd_mid;
+      case NODE_ATTRASGN:
+        return RNODE_ATTRASGN(node)->nd_mid;
+      default:
+        rb_bug("unexpected node: %s", ruby_node_name(nd_type(node)));
+    }
+}
+
+static NODE *
+get_nd_args(const NODE *node)
+{
+    switch (nd_type(node)) {
+      case NODE_CALL:
+        return RNODE_CALL(node)->nd_args;
+      case NODE_OPCALL:
+        return RNODE_OPCALL(node)->nd_args;
+      case NODE_FCALL:
+        return RNODE_FCALL(node)->nd_args;
+      case NODE_QCALL:
+        return RNODE_QCALL(node)->nd_args;
+      case NODE_VCALL:
+        return 0;
+      case NODE_ATTRASGN:
+        return RNODE_ATTRASGN(node)->nd_args;
+      default:
+        rb_bug("unexpected node: %s", ruby_node_name(nd_type(node)));
+    }
+}
+
+static ID
+get_node_colon_nd_mid(const NODE *node)
+{
+    switch (nd_type(node)) {
+      case NODE_COLON2:
+        return RNODE_COLON2(node)->nd_mid;
+      case NODE_COLON3:
+        return RNODE_COLON3(node)->nd_mid;
+      default:
+        rb_bug("unexpected node: %s", ruby_node_name(nd_type(node)));
+    }
+}
+
+static ID
+get_nd_vid(const NODE *node)
+{
+    switch (nd_type(node)) {
+      case NODE_LASGN:
+        return RNODE_LASGN(node)->nd_vid;
+      case NODE_DASGN:
+        return RNODE_DASGN(node)->nd_vid;
+      case NODE_IASGN:
+        return RNODE_IASGN(node)->nd_vid;
+      case NODE_CVASGN:
+        return RNODE_CVASGN(node)->nd_vid;
+      default:
+        rb_bug("unexpected node: %s", ruby_node_name(nd_type(node)));
+    }
+}
+
+static NODE *
+get_nd_value(const NODE *node)
+{
+    switch (nd_type(node)) {
+      case NODE_LASGN:
+        return RNODE_LASGN(node)->nd_value;
+      case NODE_DASGN:
+        return RNODE_DASGN(node)->nd_value;
+      default:
+        rb_bug("unexpected node: %s", ruby_node_name(nd_type(node)));
+    }
+}
+
+static VALUE
+get_string_value(const NODE *node)
+{
+    switch (nd_type(node)) {
+      case NODE_STR:
+        return RB_OBJ_SET_SHAREABLE(rb_node_str_string_val(node));
+      case NODE_FILE:
+        return RB_OBJ_SET_SHAREABLE(rb_node_file_path_val(node));
+      default:
+        rb_bug("unexpected node: %s", ruby_node_name(nd_type(node)));
+    }
+}
+
 VALUE
 rb_iseq_compile_callback(rb_iseq_t *iseq, const struct rb_iseq_new_with_callback_callback_func * ifunc)
 {
@@ -729,127 +852,123 @@ rb_iseq_compile_callback(rb_iseq_t *iseq, const struct rb_iseq_new_with_callback
 
     (*ifunc->func)(iseq, ret, ifunc->data);
 
-    NODE dummy_line_node = generate_dummy_line_node(ISEQ_COMPILE_DATA(iseq)->last_line, -1);
-    ADD_INSN(ret, &dummy_line_node, leave);
+    ADD_SYNTHETIC_INSN(ret, ISEQ_COMPILE_DATA(iseq)->last_line, -1, leave);
 
     CHECK(iseq_setup_insn(iseq, ret));
     return iseq_setup(iseq, ret);
 }
 
+static bool drop_unreachable_return(LINK_ANCHOR *ret);
+
 VALUE
 rb_iseq_compile_node(rb_iseq_t *iseq, const NODE *node)
 {
     DECL_ANCHOR(ret);
     INIT_ANCHOR(ret);
 
-    if (IMEMO_TYPE_P(node, imemo_ifunc)) {
-        rb_raise(rb_eArgError, "unexpected imemo_ifunc");
-    }
-
     if (node == 0) {
         NO_CHECK(COMPILE(ret, "nil", node));
-	iseq_set_local_table(iseq, 0);
+        iseq_set_local_table(iseq, 0, 0);
     }
     /* assume node is T_NODE */
     else if (nd_type_p(node, NODE_SCOPE)) {
-	/* iseq type of top, method, class, block */
-	iseq_set_local_table(iseq, node->nd_tbl);
-	iseq_set_arguments(iseq, ret, node->nd_args);
+        /* iseq type of top, method, class, block */
+        iseq_set_local_table(iseq, RNODE_SCOPE(node)->nd_tbl, (NODE *)RNODE_SCOPE(node)->nd_args);
+        iseq_set_arguments(iseq, ret, (NODE *)RNODE_SCOPE(node)->nd_args);
+        iseq_set_parameters_lvar_state(iseq);
 
         switch (ISEQ_BODY(iseq)->type) {
-	  case ISEQ_TYPE_BLOCK:
-	    {
-		LABEL *start = ISEQ_COMPILE_DATA(iseq)->start_label = NEW_LABEL(0);
-		LABEL *end = ISEQ_COMPILE_DATA(iseq)->end_label = NEW_LABEL(0);
-
-		start->rescued = LABEL_RESCUE_BEG;
-		end->rescued = LABEL_RESCUE_END;
-
-		ADD_TRACE(ret, RUBY_EVENT_B_CALL);
-                NODE dummy_line_node = generate_dummy_line_node(FIX2INT(ISEQ_BODY(iseq)->location.first_lineno), -1);
-		ADD_INSN (ret, &dummy_line_node, nop);
-		ADD_LABEL(ret, start);
-		CHECK(COMPILE(ret, "block body", node->nd_body));
-		ADD_LABEL(ret, end);
-		ADD_TRACE(ret, RUBY_EVENT_B_RETURN);
+          case ISEQ_TYPE_BLOCK:
+            {
+                LABEL *start = ISEQ_COMPILE_DATA(iseq)->start_label = NEW_LABEL(0);
+                LABEL *end = ISEQ_COMPILE_DATA(iseq)->end_label = NEW_LABEL(0);
+
+                start->rescued = LABEL_RESCUE_BEG;
+                end->rescued = LABEL_RESCUE_END;
+
+                ADD_TRACE(ret, RUBY_EVENT_B_CALL);
+                ADD_SYNTHETIC_INSN(ret, ISEQ_BODY(iseq)->location.first_lineno, -1, nop);
+                ADD_LABEL(ret, start);
+                CHECK(COMPILE(ret, "block body", RNODE_SCOPE(node)->nd_body));
+                ADD_LABEL(ret, end);
+                ADD_TRACE(ret, RUBY_EVENT_B_RETURN);
                 ISEQ_COMPILE_DATA(iseq)->last_line = ISEQ_BODY(iseq)->location.code_location.end_pos.lineno;
 
-		/* wide range catch handler must put at last */
-		ADD_CATCH_ENTRY(CATCH_TYPE_REDO, start, end, NULL, start);
-		ADD_CATCH_ENTRY(CATCH_TYPE_NEXT, start, end, NULL, end);
-		break;
-	    }
-	  case ISEQ_TYPE_CLASS:
-	    {
-		ADD_TRACE(ret, RUBY_EVENT_CLASS);
-		CHECK(COMPILE(ret, "scoped node", node->nd_body));
-		ADD_TRACE(ret, RUBY_EVENT_END);
-		ISEQ_COMPILE_DATA(iseq)->last_line = nd_line(node);
-		break;
-	    }
-	  case ISEQ_TYPE_METHOD:
-	    {
-                ISEQ_COMPILE_DATA(iseq)->root_node = node->nd_body;
-		ADD_TRACE(ret, RUBY_EVENT_CALL);
-		CHECK(COMPILE(ret, "scoped node", node->nd_body));
-                ISEQ_COMPILE_DATA(iseq)->root_node = node->nd_body;
-		ADD_TRACE(ret, RUBY_EVENT_RETURN);
-		ISEQ_COMPILE_DATA(iseq)->last_line = nd_line(node);
-		break;
-	    }
-	  default: {
-	    CHECK(COMPILE(ret, "scoped node", node->nd_body));
-	    break;
-	  }
-	}
+                /* wide range catch handler must put at last */
+                ADD_CATCH_ENTRY(CATCH_TYPE_REDO, start, end, NULL, start);
+                ADD_CATCH_ENTRY(CATCH_TYPE_NEXT, start, end, NULL, end);
+                break;
+            }
+          case ISEQ_TYPE_CLASS:
+            {
+                ADD_TRACE(ret, RUBY_EVENT_CLASS);
+                CHECK(COMPILE(ret, "scoped node", RNODE_SCOPE(node)->nd_body));
+                ADD_TRACE(ret, RUBY_EVENT_END);
+                ISEQ_COMPILE_DATA(iseq)->last_line = nd_line(node);
+                break;
+            }
+          case ISEQ_TYPE_METHOD:
+            {
+                ISEQ_COMPILE_DATA(iseq)->root_node = RNODE_SCOPE(node)->nd_body;
+                ADD_TRACE(ret, RUBY_EVENT_CALL);
+                CHECK(COMPILE(ret, "scoped node", RNODE_SCOPE(node)->nd_body));
+                ISEQ_COMPILE_DATA(iseq)->root_node = RNODE_SCOPE(node)->nd_body;
+                ADD_TRACE(ret, RUBY_EVENT_RETURN);
+                ISEQ_COMPILE_DATA(iseq)->last_line = nd_line(node);
+                break;
+            }
+          default: {
+            CHECK(COMPILE(ret, "scoped node", RNODE_SCOPE(node)->nd_body));
+            break;
+          }
+        }
     }
     else {
-	const char *m;
+        const char *m;
 #define INVALID_ISEQ_TYPE(type) \
-	ISEQ_TYPE_##type: m = #type; goto invalid_iseq_type
+        ISEQ_TYPE_##type: m = #type; goto invalid_iseq_type
         switch (ISEQ_BODY(iseq)->type) {
-	  case INVALID_ISEQ_TYPE(METHOD);
-	  case INVALID_ISEQ_TYPE(CLASS);
-	  case INVALID_ISEQ_TYPE(BLOCK);
-	  case INVALID_ISEQ_TYPE(EVAL);
-	  case INVALID_ISEQ_TYPE(MAIN);
-	  case INVALID_ISEQ_TYPE(TOP);
+          case INVALID_ISEQ_TYPE(METHOD);
+          case INVALID_ISEQ_TYPE(CLASS);
+          case INVALID_ISEQ_TYPE(BLOCK);
+          case INVALID_ISEQ_TYPE(EVAL);
+          case INVALID_ISEQ_TYPE(MAIN);
+          case INVALID_ISEQ_TYPE(TOP);
 #undef INVALID_ISEQ_TYPE /* invalid iseq types end */
-	  case ISEQ_TYPE_RESCUE:
-	    iseq_set_exception_local_table(iseq);
-	    CHECK(COMPILE(ret, "rescue", node));
-	    break;
-	  case ISEQ_TYPE_ENSURE:
-	    iseq_set_exception_local_table(iseq);
-	    CHECK(COMPILE_POPPED(ret, "ensure", node));
-	    break;
-	  case ISEQ_TYPE_PLAIN:
-	    CHECK(COMPILE(ret, "ensure", node));
-	    break;
-	  default:
+          case ISEQ_TYPE_RESCUE:
+            iseq_set_exception_local_table(iseq);
+            CHECK(COMPILE(ret, "rescue", node));
+            break;
+          case ISEQ_TYPE_ENSURE:
+            iseq_set_exception_local_table(iseq);
+            CHECK(COMPILE_POPPED(ret, "ensure", node));
+            break;
+          case ISEQ_TYPE_PLAIN:
+            CHECK(COMPILE(ret, "ensure", node));
+            break;
+          default:
             COMPILE_ERROR(ERROR_ARGS "unknown scope: %d", ISEQ_BODY(iseq)->type);
-	    return COMPILE_NG;
-	  invalid_iseq_type:
-	    COMPILE_ERROR(ERROR_ARGS "compile/ISEQ_TYPE_%s should not be reached", m);
-	    return COMPILE_NG;
-	}
+            return COMPILE_NG;
+          invalid_iseq_type:
+            COMPILE_ERROR(ERROR_ARGS "compile/ISEQ_TYPE_%s should not be reached", m);
+            return COMPILE_NG;
+        }
     }
 
     if (ISEQ_BODY(iseq)->type == ISEQ_TYPE_RESCUE || ISEQ_BODY(iseq)->type == ISEQ_TYPE_ENSURE) {
         NODE dummy_line_node = generate_dummy_line_node(0, -1);
-	ADD_GETLOCAL(ret, &dummy_line_node, LVAR_ERRINFO, 0);
-	ADD_INSN1(ret, &dummy_line_node, throw, INT2FIX(0) /* continue throw */ );
+        ADD_GETLOCAL(ret, &dummy_line_node, LVAR_ERRINFO, 0);
+        ADD_INSN1(ret, &dummy_line_node, throw, INT2FIX(0) /* continue throw */ );
     }
-    else {
-        NODE dummy_line_node = generate_dummy_line_node(ISEQ_COMPILE_DATA(iseq)->last_line, -1);
-	ADD_INSN(ret, &dummy_line_node, leave);
+    else if (!drop_unreachable_return(ret)) {
+        ADD_SYNTHETIC_INSN(ret, ISEQ_COMPILE_DATA(iseq)->last_line, -1, leave);
     }
 
 #if OPT_SUPPORT_JOKE
     if (ISEQ_COMPILE_DATA(iseq)->labels_table) {
-	st_table *labels_table = ISEQ_COMPILE_DATA(iseq)->labels_table;
-	ISEQ_COMPILE_DATA(iseq)->labels_table = 0;
-	validate_labels(iseq, labels_table);
+        st_table *labels_table = ISEQ_COMPILE_DATA(iseq)->labels_table;
+        ISEQ_COMPILE_DATA(iseq)->labels_table = 0;
+        validate_labels(iseq, labels_table);
     }
 #endif
     CHECK(iseq_setup_insn(iseq, ret));
@@ -866,12 +985,18 @@ rb_iseq_translate_threaded_code(rb_iseq_t *iseq)
 
     for (i = 0; i < ISEQ_BODY(iseq)->iseq_size; /* */ ) {
         int insn = (int)ISEQ_BODY(iseq)->iseq_encoded[i];
-	int len = insn_len(insn);
-	encoded[i] = (VALUE)table[insn];
-	i += len;
+        int len = insn_len(insn);
+        encoded[i] = (VALUE)table[insn];
+        i += len;
     }
     FL_SET((VALUE)iseq, ISEQ_TRANSLATED);
 #endif
+
+#if USE_YJIT
+    rb_yjit_live_iseq_count++;
+    rb_yjit_iseq_alloc_count++;
+#endif
+
     return COMPILE_OK;
 }
 
@@ -886,15 +1011,15 @@ rb_iseq_original_iseq(const rb_iseq_t *iseq) /* cold path */
 
 #if OPT_DIRECT_THREADED_CODE || OPT_CALL_THREADED_CODE
     {
-	unsigned int i;
+        unsigned int i;
 
         for (i = 0; i < ISEQ_BODY(iseq)->iseq_size; /* */ ) {
-	    const void *addr = (const void *)original_code[i];
-	    const int insn = rb_vm_insn_addr2insn(addr);
+            const void *addr = (const void *)original_code[i];
+            const int insn = rb_vm_insn_addr2insn(addr);
 
-	    original_code[i] = insn;
-	    i += insn_len(insn);
-	}
+            original_code[i] = insn;
+            i += insn_len(insn);
+        }
     }
 #endif
     return original_code;
@@ -976,18 +1101,18 @@ compile_data_alloc_with_arena(struct iseq_compile_data_storage **arena, size_t s
 
     if (size >= INT_MAX - padding) rb_memerror();
     if (storage->pos + size + padding > storage->size) {
-	unsigned int alloc_size = storage->size;
-
-	while (alloc_size < size + PADDING_SIZE_MAX) {
-	    if (alloc_size >= INT_MAX / 2) rb_memerror();
-	    alloc_size *= 2;
-	}
-	storage->next = (void *)ALLOC_N(char, alloc_size +
-					offsetof(struct iseq_compile_data_storage, buff));
-	storage = *arena = storage->next;
-	storage->next = 0;
-	storage->pos = 0;
-	storage->size = alloc_size;
+        unsigned int alloc_size = storage->size;
+
+        while (alloc_size < size + PADDING_SIZE_MAX) {
+            if (alloc_size >= INT_MAX / 2) rb_memerror();
+            alloc_size *= 2;
+        }
+        storage->next = (void *)ALLOC_N(char, alloc_size +
+                                        offsetof(struct iseq_compile_data_storage, buff));
+        storage = *arena = storage->next;
+        storage->next = 0;
+        storage->pos = 0;
+        storage->size = alloc_size;
 #ifdef STRICT_ALIGNMENT
         padding = calc_padding((void *)&storage->buff[storage->pos], size);
 #endif /* STRICT_ALIGNMENT */
@@ -1060,7 +1185,7 @@ ELEM_INSERT_NEXT(LINK_ELEMENT *elem1, LINK_ELEMENT *elem2)
     elem2->prev = elem1;
     elem1->next = elem2;
     if (elem2->next) {
-	elem2->next->prev = elem2;
+        elem2->next->prev = elem2;
     }
 }
 
@@ -1074,7 +1199,7 @@ ELEM_INSERT_PREV(LINK_ELEMENT *elem1, LINK_ELEMENT *elem2)
     elem2->next = elem1;
     elem1->prev = elem2;
     if (elem2->prev) {
-	elem2->prev->next = elem2;
+        elem2->prev->next = elem2;
     }
 }
 
@@ -1087,10 +1212,10 @@ ELEM_REPLACE(LINK_ELEMENT *elem1, LINK_ELEMENT *elem2)
     elem2->prev = elem1->prev;
     elem2->next = elem1->next;
     if (elem1->prev) {
-	elem1->prev->next = elem2;
+        elem1->prev->next = elem2;
     }
     if (elem1->next) {
-	elem1->next->prev = elem2;
+        elem1->next->prev = elem2;
     }
 }
 
@@ -1099,7 +1224,7 @@ ELEM_REMOVE(LINK_ELEMENT *elem)
 {
     elem->prev->next = elem->next;
     if (elem->next) {
-	elem->next->prev = elem->prev;
+        elem->next->prev = elem->prev;
     }
 }
 
@@ -1119,13 +1244,13 @@ static LINK_ELEMENT *
 ELEM_FIRST_INSN(LINK_ELEMENT *elem)
 {
     while (elem) {
-	switch (elem->type) {
-	  case ISEQ_ELEMENT_INSN:
-	  case ISEQ_ELEMENT_ADJUST:
-	    return elem;
-	  default:
-	    elem = elem->next;
-	}
+        switch (elem->type) {
+          case ISEQ_ELEMENT_INSN:
+          case ISEQ_ELEMENT_ADJUST:
+            return elem;
+          default:
+            elem = elem->next;
+        }
     }
     return NULL;
 }
@@ -1135,11 +1260,11 @@ LIST_INSN_SIZE_ONE(const LINK_ANCHOR *const anchor)
 {
     LINK_ELEMENT *first_insn = ELEM_FIRST_INSN(FIRST_ELEMENT(anchor));
     if (first_insn != NULL &&
-	ELEM_FIRST_INSN(first_insn->next) == NULL) {
-	return TRUE;
+        ELEM_FIRST_INSN(first_insn->next) == NULL) {
+        return TRUE;
     }
     else {
-	return FALSE;
+        return FALSE;
     }
 }
 
@@ -1147,10 +1272,10 @@ static int
 LIST_INSN_SIZE_ZERO(const LINK_ANCHOR *const anchor)
 {
     if (ELEM_FIRST_INSN(FIRST_ELEMENT(anchor)) == NULL) {
-	return TRUE;
+        return TRUE;
     }
     else {
-	return FALSE;
+        return FALSE;
     }
 }
 
@@ -1165,9 +1290,14 @@ static void
 APPEND_LIST(ISEQ_ARG_DECLARE LINK_ANCHOR *const anc1, LINK_ANCHOR *const anc2)
 {
     if (anc2->anchor.next) {
-	anc1->last->next = anc2->anchor.next;
-	anc2->anchor.next->prev = anc1->last;
-	anc1->last = anc2->last;
+        /* LINK_ANCHOR must not loop */
+        RUBY_ASSERT(anc2->last != &anc2->anchor);
+        anc1->last->next = anc2->anchor.next;
+        anc2->anchor.next->prev = anc1->last;
+        anc1->last = anc2->last;
+    }
+    else {
+        RUBY_ASSERT(anc2->last == &anc2->anchor);
     }
     verify_list("append", anc1);
 }
@@ -1182,11 +1312,11 @@ debug_list(ISEQ_ARG_DECLARE LINK_ANCHOR *const anchor, LINK_ELEMENT *cur)
     LINK_ELEMENT *list = FIRST_ELEMENT(anchor);
     printf("----\n");
     printf("anch: %p, frst: %p, last: %p\n", (void *)&anchor->anchor,
-	   (void *)anchor->anchor.next, (void *)anchor->last);
+           (void *)anchor->anchor.next, (void *)anchor->last);
     while (list) {
-	printf("curr: %p, next: %p, prev: %p, type: %d\n", (void *)list, (void *)list->next,
-	       (void *)list->prev, (int)list->type);
-	list = list->next;
+        printf("curr: %p, next: %p, prev: %p, type: %d\n", (void *)list, (void *)list->next,
+               (void *)list->prev, (int)list->type);
+        list = list->next;
     }
     printf("----\n");
 
@@ -1228,6 +1358,7 @@ new_label_body(rb_iseq_t *iseq, long line)
     labelobj->set = 0;
     labelobj->rescued = LABEL_RESCUE_NONE;
     labelobj->unremovable = 0;
+    labelobj->position = -1;
     return labelobj;
 }
 
@@ -1243,9 +1374,37 @@ new_adjust_body(rb_iseq_t *iseq, LABEL *label, int line)
     return adjust;
 }
 
+static void
+iseq_insn_each_markable_object(INSN *insn, void (*func)(VALUE *, VALUE), VALUE data)
+{
+    const char *types = insn_op_types(insn->insn_id);
+    for (int j = 0; types[j]; j++) {
+        char type = types[j];
+        switch (type) {
+          case TS_CDHASH:
+          case TS_ISEQ:
+          case TS_VALUE:
+          case TS_IC: // constant path array
+          case TS_CALLDATA: // ci is stored.
+            func(&OPERAND_AT(insn, j), data);
+            break;
+          default:
+            break;
+        }
+    }
+}
+
+static void
+iseq_insn_each_object_write_barrier(VALUE * obj, VALUE iseq)
+{
+    RB_OBJ_WRITTEN(iseq, Qundef, *obj);
+    RUBY_ASSERT(SPECIAL_CONST_P(*obj) ||
+                RBASIC_CLASS(*obj) == 0 || // hidden
+                RB_OBJ_SHAREABLE_P(*obj));
+}
+
 static INSN *
-new_insn_core(rb_iseq_t *iseq, const NODE *line_node,
-	      int insn_id, int argc, VALUE *argv)
+new_insn_core(rb_iseq_t *iseq, int line_no, int node_id, int insn_id, int argc, VALUE *argv)
 {
     INSN *iobj = compile_data_alloc_insn(iseq);
 
@@ -1254,31 +1413,58 @@ new_insn_core(rb_iseq_t *iseq, const NODE *line_node,
     iobj->link.type = ISEQ_ELEMENT_INSN;
     iobj->link.next = 0;
     iobj->insn_id = insn_id;
-    iobj->insn_info.line_no = nd_line(line_node);
-    iobj->insn_info.node_id = nd_node_id(line_node);
+    iobj->insn_info.line_no = line_no;
+    iobj->insn_info.node_id = node_id;
     iobj->insn_info.events = 0;
     iobj->operands = argv;
     iobj->operand_size = argc;
     iobj->sc_state = 0;
+
+    iseq_insn_each_markable_object(iobj, iseq_insn_each_object_write_barrier, (VALUE)iseq);
+
     return iobj;
 }
 
 static INSN *
-new_insn_body(rb_iseq_t *iseq, const NODE *const line_node, enum ruby_vminsn_type insn_id, int argc, ...)
+new_insn_body(rb_iseq_t *iseq, int line_no, int node_id, enum ruby_vminsn_type insn_id, int argc, ...)
+{
+    VALUE *operands = 0;
+    va_list argv;
+    if (argc > 0) {
+        int i;
+        va_start(argv, argc);
+        operands = compile_data_alloc2(iseq, sizeof(VALUE), argc);
+        for (i = 0; i < argc; i++) {
+            VALUE v = va_arg(argv, VALUE);
+            operands[i] = v;
+        }
+        va_end(argv);
+    }
+    return new_insn_core(iseq, line_no, node_id, insn_id, argc, operands);
+}
+
+static INSN *
+insn_replace_with_operands(rb_iseq_t *iseq, INSN *iobj, enum ruby_vminsn_type insn_id, int argc, ...)
 {
     VALUE *operands = 0;
     va_list argv;
     if (argc > 0) {
-	int i;
+        int i;
         va_start(argv, argc);
         operands = compile_data_alloc2(iseq, sizeof(VALUE), argc);
-	for (i = 0; i < argc; i++) {
-	    VALUE v = va_arg(argv, VALUE);
-	    operands[i] = v;
-	}
-	va_end(argv);
+        for (i = 0; i < argc; i++) {
+            VALUE v = va_arg(argv, VALUE);
+            operands[i] = v;
+        }
+        va_end(argv);
     }
-    return new_insn_core(iseq, line_node, insn_id, argc, operands);
+
+    iobj->insn_id = insn_id;
+    iobj->operand_size = argc;
+    iobj->operands = operands;
+    iseq_insn_each_markable_object(iobj, iseq_insn_each_object_write_barrier, (VALUE)iseq);
+
+    return iobj;
 }
 
 static const struct rb_callinfo *
@@ -1286,16 +1472,16 @@ new_callinfo(rb_iseq_t *iseq, ID mid, int argc, unsigned int flag, struct rb_cal
 {
     VM_ASSERT(argc >= 0);
 
-    if (!(flag & (VM_CALL_ARGS_SPLAT | VM_CALL_ARGS_BLOCKARG | VM_CALL_KW_SPLAT)) &&
-        kw_arg == NULL && !has_blockiseq) {
-        flag |= VM_CALL_ARGS_SIMPLE;
-    }
-
     if (kw_arg) {
         flag |= VM_CALL_KWARG;
         argc += kw_arg->keyword_len;
     }
 
+    if (!(flag & (VM_CALL_ARGS_SPLAT | VM_CALL_ARGS_BLOCKARG | VM_CALL_KWARG | VM_CALL_KW_SPLAT | VM_CALL_FORWARDING))
+        && !has_blockiseq) {
+        flag |= VM_CALL_ARGS_SIMPLE;
+    }
+
     ISEQ_BODY(iseq)->ci_size++;
     const struct rb_callinfo *ci = vm_ci_new(mid, flag, argc, kw_arg);
     RB_OBJ_WRITTEN(iseq, Qundef, ci);
@@ -1303,7 +1489,7 @@ new_callinfo(rb_iseq_t *iseq, ID mid, int argc, unsigned int flag, struct rb_cal
 }
 
 static INSN *
-new_insn_send(rb_iseq_t *iseq, const NODE *const line_node, ID id, VALUE argc, const rb_iseq_t *blockiseq, VALUE flag, struct rb_callinfo_kwarg *keywords)
+new_insn_send(rb_iseq_t *iseq, int line_no, int node_id, ID id, VALUE argc, const rb_iseq_t *blockiseq, VALUE flag, struct rb_callinfo_kwarg *keywords)
 {
     VALUE *operands = compile_data_calloc2(iseq, sizeof(VALUE), 2);
     VALUE ci = (VALUE)new_callinfo(iseq, id, FIX2INT(argc), FIX2INT(flag), keywords, blockiseq != NULL);
@@ -1312,7 +1498,16 @@ new_insn_send(rb_iseq_t *iseq, const NODE *const line_node, ID id, VALUE argc, c
     if (blockiseq) {
         RB_OBJ_WRITTEN(iseq, Qundef, blockiseq);
     }
-    INSN *insn = new_insn_core(iseq, line_node, BIN(send), 2, operands);
+
+    INSN *insn;
+
+    if (vm_ci_flag((struct rb_callinfo *)ci) & VM_CALL_FORWARDING) {
+        insn = new_insn_core(iseq, line_no, node_id, BIN(sendforward), 2, operands);
+    }
+    else {
+        insn = new_insn_core(iseq, line_no, node_id, BIN(send), 2, operands);
+    }
+
     RB_OBJ_WRITTEN(iseq, Qundef, ci);
     RB_GC_GUARD(ci);
     return insn;
@@ -1320,58 +1515,58 @@ new_insn_send(rb_iseq_t *iseq, const NODE *const line_node, ID id, VALUE argc, c
 
 static rb_iseq_t *
 new_child_iseq(rb_iseq_t *iseq, const NODE *const node,
-	       VALUE name, const rb_iseq_t *parent, enum iseq_type type, int line_no)
+               VALUE name, const rb_iseq_t *parent, enum rb_iseq_type type, int line_no)
 {
     rb_iseq_t *ret_iseq;
-    rb_ast_body_t ast;
-
-    ast.root = node;
-    ast.compile_option = 0;
-    ast.script_lines = ISEQ_BODY(iseq)->variable.script_lines;
+    VALUE ast_value = rb_ruby_ast_new(node);
 
     debugs("[new_child_iseq]> ---------------------------------------\n");
     int isolated_depth = ISEQ_COMPILE_DATA(iseq)->isolated_depth;
-    ret_iseq = rb_iseq_new_with_opt(&ast, name,
-				    rb_iseq_path(iseq), rb_iseq_realpath(iseq),
-                                    INT2FIX(line_no), parent,
+    ret_iseq = rb_iseq_new_with_opt(ast_value, name,
+                                    rb_iseq_path(iseq), rb_iseq_realpath(iseq),
+                                    line_no, parent,
                                     isolated_depth ? isolated_depth + 1 : 0,
-                                    type, ISEQ_COMPILE_DATA(iseq)->option);
+                                    type, ISEQ_COMPILE_DATA(iseq)->option,
+                                    ISEQ_BODY(iseq)->variable.script_lines);
     debugs("[new_child_iseq]< ---------------------------------------\n");
     return ret_iseq;
 }
 
 static rb_iseq_t *
 new_child_iseq_with_callback(rb_iseq_t *iseq, const struct rb_iseq_new_with_callback_callback_func *ifunc,
-		     VALUE name, const rb_iseq_t *parent, enum iseq_type type, int line_no)
+                     VALUE name, const rb_iseq_t *parent, enum rb_iseq_type type, int line_no)
 {
     rb_iseq_t *ret_iseq;
 
     debugs("[new_child_iseq_with_callback]> ---------------------------------------\n");
     ret_iseq = rb_iseq_new_with_callback(ifunc, name,
-				 rb_iseq_path(iseq), rb_iseq_realpath(iseq),
-				 INT2FIX(line_no), parent, type, ISEQ_COMPILE_DATA(iseq)->option);
+                                 rb_iseq_path(iseq), rb_iseq_realpath(iseq),
+                                 line_no, parent, type, ISEQ_COMPILE_DATA(iseq)->option);
     debugs("[new_child_iseq_with_callback]< ---------------------------------------\n");
     return ret_iseq;
 }
 
 static void
-set_catch_except_p(struct rb_iseq_constant_body *body)
+set_catch_except_p(rb_iseq_t *iseq)
 {
-    body->catch_except_p = TRUE;
-    if (body->parent_iseq != NULL) {
-        set_catch_except_p(ISEQ_BODY(body->parent_iseq));
+    RUBY_ASSERT(ISEQ_COMPILE_DATA(iseq));
+    ISEQ_COMPILE_DATA(iseq)->catch_except_p = true;
+    if (ISEQ_BODY(iseq)->parent_iseq != NULL) {
+        if (ISEQ_COMPILE_DATA(ISEQ_BODY(iseq)->parent_iseq)) {
+          set_catch_except_p((rb_iseq_t *) ISEQ_BODY(iseq)->parent_iseq);
+        }
     }
 }
 
-/* Set body->catch_except_p to TRUE if the ISeq may catch an exception. If it is FALSE,
-   JIT-ed code may be optimized.  If we are extremely conservative, we should set TRUE
+/* Set body->catch_except_p to true if the ISeq may catch an exception. If it is false,
+   JIT-ed code may be optimized.  If we are extremely conservative, we should set true
    if catch table exists.  But we want to optimize while loop, which always has catch
    table entries for break/next/redo.
 
-   So this function sets TRUE for limited ISeqs with break/next/redo catch table entries
+   So this function sets true for limited ISeqs with break/next/redo catch table entries
    whose child ISeq would really raise an exception. */
 static void
-update_catch_except_flags(struct rb_iseq_constant_body *body)
+update_catch_except_flags(rb_iseq_t *iseq, struct rb_iseq_constant_body *body)
 {
     unsigned int pos;
     size_t i;
@@ -1384,7 +1579,7 @@ update_catch_except_flags(struct rb_iseq_constant_body *body)
     while (pos < body->iseq_size) {
         insn = rb_vm_insn_decode(body->iseq_encoded[pos]);
         if (insn == BIN(throw)) {
-            set_catch_except_p(body);
+            set_catch_except_p(iseq);
             break;
         }
         pos += insn_len(insn);
@@ -1399,7 +1594,8 @@ update_catch_except_flags(struct rb_iseq_constant_body *body)
         if (entry->type != CATCH_TYPE_BREAK
             && entry->type != CATCH_TYPE_NEXT
             && entry->type != CATCH_TYPE_REDO) {
-            body->catch_except_p = TRUE;
+            RUBY_ASSERT(ISEQ_COMPILE_DATA(iseq));
+            ISEQ_COMPILE_DATA(iseq)->catch_except_p = true;
             break;
         }
     }
@@ -1411,14 +1607,14 @@ iseq_insert_nop_between_end_and_cont(rb_iseq_t *iseq)
     VALUE catch_table_ary = ISEQ_COMPILE_DATA(iseq)->catch_table_ary;
     if (NIL_P(catch_table_ary)) return;
     unsigned int i, tlen = (unsigned int)RARRAY_LEN(catch_table_ary);
-    const VALUE *tptr = RARRAY_CONST_PTR_TRANSIENT(catch_table_ary);
+    const VALUE *tptr = RARRAY_CONST_PTR(catch_table_ary);
     for (i = 0; i < tlen; i++) {
-        const VALUE *ptr = RARRAY_CONST_PTR_TRANSIENT(tptr[i]);
+        const VALUE *ptr = RARRAY_CONST_PTR(tptr[i]);
         LINK_ELEMENT *end = (LINK_ELEMENT *)(ptr[2] & ~1);
         LINK_ELEMENT *cont = (LINK_ELEMENT *)(ptr[4] & ~1);
         LINK_ELEMENT *e;
 
-        enum catch_type ct = (enum catch_type)(ptr[0] & 0xffff);
+        enum rb_catch_type ct = (enum rb_catch_type)(ptr[0] & 0xffff);
 
         if (ct != CATCH_TYPE_BREAK
             && ct != CATCH_TYPE_NEXT
@@ -1426,45 +1622,39 @@ iseq_insert_nop_between_end_and_cont(rb_iseq_t *iseq)
 
             for (e = end; e && (IS_LABEL(e) || IS_TRACE(e)); e = e->next) {
                 if (e == cont) {
-                    NODE dummy_line_node = generate_dummy_line_node(0, -1);
-                    INSN *nop = new_insn_core(iseq, &dummy_line_node, BIN(nop), 0, 0);
+                    INSN *nop = new_insn_core(iseq, 0, -1, BIN(nop), 0, 0);
                     ELEM_INSERT_NEXT(end, &nop->link);
                     break;
                 }
             }
         }
     }
+
+    RB_GC_GUARD(catch_table_ary);
 }
 
 static int
 iseq_setup_insn(rb_iseq_t *iseq, LINK_ANCHOR *const anchor)
 {
     if (RTEST(ISEQ_COMPILE_DATA(iseq)->err_info))
-	return COMPILE_NG;
+        return COMPILE_NG;
 
     /* debugs("[compile step 2] (iseq_array_to_linkedlist)\n"); */
 
     if (compile_debug > 5)
-	dump_disasm_list(FIRST_ELEMENT(anchor));
+        dump_disasm_list(FIRST_ELEMENT(anchor));
 
     debugs("[compile step 3.1 (iseq_optimize)]\n");
     iseq_optimize(iseq, anchor);
 
     if (compile_debug > 5)
-	dump_disasm_list(FIRST_ELEMENT(anchor));
+        dump_disasm_list(FIRST_ELEMENT(anchor));
 
     if (ISEQ_COMPILE_DATA(iseq)->option->instructions_unification) {
-	debugs("[compile step 3.2 (iseq_insns_unification)]\n");
-	iseq_insns_unification(iseq, anchor);
-	if (compile_debug > 5)
-	    dump_disasm_list(FIRST_ELEMENT(anchor));
-    }
-
-    if (ISEQ_COMPILE_DATA(iseq)->option->stack_caching) {
-	debugs("[compile step 3.3 (iseq_set_sequence_stackcaching)]\n");
-	iseq_set_sequence_stackcaching(iseq, anchor);
-	if (compile_debug > 5)
-	    dump_disasm_list(FIRST_ELEMENT(anchor));
+        debugs("[compile step 3.2 (iseq_insns_unification)]\n");
+        iseq_insns_unification(iseq, anchor);
+        if (compile_debug > 5)
+            dump_disasm_list(FIRST_ELEMENT(anchor));
     }
 
     debugs("[compile step 3.4 (iseq_insert_nop_between_end_and_cont)]\n");
@@ -1484,7 +1674,7 @@ iseq_setup(rb_iseq_t *iseq, LINK_ANCHOR *const anchor)
     debugs("[compile step 4.1 (iseq_set_sequence)]\n");
     if (!iseq_set_sequence(iseq, anchor)) return COMPILE_NG;
     if (compile_debug > 5)
-	dump_disasm_list(FIRST_ELEMENT(anchor));
+        dump_disasm_list(FIRST_ELEMENT(anchor));
 
     debugs("[compile step 4.2 (iseq_set_exception_table)]\n");
     if (!iseq_set_exception_table(iseq)) return COMPILE_NG;
@@ -1496,10 +1686,12 @@ iseq_setup(rb_iseq_t *iseq, LINK_ANCHOR *const anchor)
     if (!rb_iseq_translate_threaded_code(iseq)) return COMPILE_NG;
 
     debugs("[compile step 6 (update_catch_except_flags)] \n");
-    update_catch_except_flags(ISEQ_BODY(iseq));
+    RUBY_ASSERT(ISEQ_COMPILE_DATA(iseq));
+    update_catch_except_flags(iseq, ISEQ_BODY(iseq));
 
     debugs("[compile step 6.1 (remove unused catch tables)] \n");
-    if (!ISEQ_BODY(iseq)->catch_except_p && ISEQ_BODY(iseq)->catch_table) {
+    RUBY_ASSERT(ISEQ_COMPILE_DATA(iseq));
+    if (!ISEQ_COMPILE_DATA(iseq)->catch_except_p && ISEQ_BODY(iseq)->catch_table) {
         xfree(ISEQ_BODY(iseq)->catch_table);
         ISEQ_BODY(iseq)->catch_table = NULL;
     }
@@ -1512,8 +1704,8 @@ iseq_setup(rb_iseq_t *iseq, LINK_ANCHOR *const anchor)
 #endif
 
     if (compile_debug > 1) {
-	VALUE str = rb_iseq_disasm(iseq);
-	printf("%s\n", StringValueCStr(str));
+        VALUE str = rb_iseq_disasm(iseq);
+        printf("%s\n", StringValueCStr(str));
     }
     verify_call_cache(iseq);
     debugs("[compile step: finish]\n");
@@ -1526,6 +1718,7 @@ iseq_set_exception_local_table(rb_iseq_t *iseq)
 {
     ISEQ_BODY(iseq)->local_table_size = numberof(rb_iseq_shared_exc_local_tbl);
     ISEQ_BODY(iseq)->local_table = rb_iseq_shared_exc_local_tbl;
+    ISEQ_BODY(iseq)->lvar_states = NULL; // $! is read-only, so don't need lvar_states
     return COMPILE_OK;
 }
 
@@ -1534,7 +1727,7 @@ get_lvar_level(const rb_iseq_t *iseq)
 {
     int lev = 0;
     while (iseq != ISEQ_BODY(iseq)->local_iseq) {
-	lev++;
+        lev++;
         iseq = ISEQ_BODY(iseq)->parent_iseq;
     }
     return lev;
@@ -1547,8 +1740,8 @@ get_dyna_var_idx_at_raw(const rb_iseq_t *iseq, ID id)
 
     for (i = 0; i < ISEQ_BODY(iseq)->local_table_size; i++) {
         if (ISEQ_BODY(iseq)->local_table[i] == id) {
-	    return (int)i;
-	}
+            return (int)i;
+        }
     }
     return -1;
 }
@@ -1573,12 +1766,12 @@ get_dyna_var_idx(const rb_iseq_t *iseq, ID id, int *level, int *ls)
     const rb_iseq_t *const topmost_iseq = iseq;
 
     while (iseq) {
-	idx = get_dyna_var_idx_at_raw(iseq, id);
-	if (idx >= 0) {
-	    break;
-	}
+        idx = get_dyna_var_idx_at_raw(iseq, id);
+        if (idx >= 0) {
+            break;
+        }
         iseq = ISEQ_BODY(iseq)->parent_iseq;
-	lv++;
+        lv++;
     }
 
     if (idx < 0) {
@@ -1597,16 +1790,16 @@ iseq_local_block_param_p(const rb_iseq_t *iseq, unsigned int idx, unsigned int l
     const struct rb_iseq_constant_body *body;
     while (level > 0) {
         iseq = ISEQ_BODY(iseq)->parent_iseq;
-	level--;
+        level--;
     }
     body = ISEQ_BODY(iseq);
     if (body->local_iseq == iseq && /* local variables */
-	body->param.flags.has_block &&
-	body->local_table_size - body->param.block_start == idx) {
-	return TRUE;
+        body->param.flags.has_block &&
+        body->local_table_size - body->param.block_start == idx) {
+        return TRUE;
     }
     else {
-	return FALSE;
+        return FALSE;
     }
 }
 
@@ -1616,12 +1809,12 @@ iseq_block_param_id_p(const rb_iseq_t *iseq, ID id, int *pidx, int *plevel)
     int level, ls;
     int idx = get_dyna_var_idx(iseq, id, &level, &ls);
     if (iseq_local_block_param_p(iseq, ls - idx, level)) {
-	*pidx = ls - idx;
-	*plevel = level;
-	return TRUE;
+        *pidx = ls - idx;
+        *plevel = level;
+        return TRUE;
     }
     else {
-	return FALSE;
+        return FALSE;
     }
 }
 
@@ -1635,7 +1828,7 @@ access_outer_variables(const rb_iseq_t *iseq, int level, ID id, bool write)
             COMPILE_ERROR(iseq, ISEQ_LAST_LINE(iseq), "can not yield from isolated Proc");
         }
         else {
-            COMPILE_ERROR(iseq, ISEQ_LAST_LINE(iseq), "can not access variable `%s' from isolated Proc", rb_id2name(id));
+            COMPILE_ERROR(iseq, ISEQ_LAST_LINE(iseq), "can not access variable '%s' from isolated Proc", rb_id2name(id));
         }
     }
 
@@ -1673,13 +1866,53 @@ iseq_lvar_id(const rb_iseq_t *iseq, int idx, int level)
 }
 
 static void
+update_lvar_state(const rb_iseq_t *iseq, int level, int idx)
+{
+    for (int i=0; i<level; i++) {
+        iseq = ISEQ_BODY(iseq)->parent_iseq;
+    }
+
+    enum lvar_state *states = ISEQ_BODY(iseq)->lvar_states;
+    int table_idx = ISEQ_BODY(iseq)->local_table_size - idx;
+    switch (states[table_idx]) {
+      case lvar_uninitialized:
+        states[table_idx] = lvar_initialized;
+        break;
+      case lvar_initialized:
+        states[table_idx] = lvar_reassigned;
+        break;
+      case lvar_reassigned:
+        /* nothing */
+        break;
+      default:
+        rb_bug("unreachable");
+    }
+}
+
+static int
+iseq_set_parameters_lvar_state(const rb_iseq_t *iseq)
+{
+    for (unsigned int i=0; i<ISEQ_BODY(iseq)->param.size; i++) {
+        ISEQ_BODY(iseq)->lvar_states[i] = lvar_initialized;
+    }
+
+    int lead_num = ISEQ_BODY(iseq)->param.lead_num;
+    int opt_num = ISEQ_BODY(iseq)->param.opt_num;
+    for (int i=0; i<opt_num; i++) {
+        ISEQ_BODY(iseq)->lvar_states[lead_num + i] = lvar_uninitialized;
+    }
+
+    return COMPILE_OK;
+}
+
+static void
 iseq_add_getlocal(rb_iseq_t *iseq, LINK_ANCHOR *const seq, const NODE *const line_node, int idx, int level)
 {
     if (iseq_local_block_param_p(iseq, idx, level)) {
-	ADD_INSN2(seq, line_node, getblockparam, INT2FIX((idx) + VM_ENV_DATA_SIZE - 1), INT2FIX(level));
+        ADD_INSN2(seq, line_node, getblockparam, INT2FIX((idx) + VM_ENV_DATA_SIZE - 1), INT2FIX(level));
     }
     else {
-	ADD_INSN2(seq, line_node, getlocal, INT2FIX((idx) + VM_ENV_DATA_SIZE - 1), INT2FIX(level));
+        ADD_INSN2(seq, line_node, getlocal, INT2FIX((idx) + VM_ENV_DATA_SIZE - 1), INT2FIX(level));
     }
     if (level > 0) access_outer_variables(iseq, level, iseq_lvar_id(iseq, idx, level), Qfalse);
 }
@@ -1688,11 +1921,12 @@ static void
 iseq_add_setlocal(rb_iseq_t *iseq, LINK_ANCHOR *const seq, const NODE *const line_node, int idx, int level)
 {
     if (iseq_local_block_param_p(iseq, idx, level)) {
-	ADD_INSN2(seq, line_node, setblockparam, INT2FIX((idx) + VM_ENV_DATA_SIZE - 1), INT2FIX(level));
+        ADD_INSN2(seq, line_node, setblockparam, INT2FIX((idx) + VM_ENV_DATA_SIZE - 1), INT2FIX(level));
     }
     else {
-	ADD_INSN2(seq, line_node, setlocal, INT2FIX((idx) + VM_ENV_DATA_SIZE - 1), INT2FIX(level));
+        ADD_INSN2(seq, line_node, setlocal, INT2FIX((idx) + VM_ENV_DATA_SIZE - 1), INT2FIX(level));
     }
+    update_lvar_state(iseq, level, idx);
     if (level > 0) access_outer_variables(iseq, level, iseq_lvar_id(iseq, idx, level), Qtrue);
 }
 
@@ -1703,47 +1937,47 @@ iseq_calc_param_size(rb_iseq_t *iseq)
 {
     struct rb_iseq_constant_body *const body = ISEQ_BODY(iseq);
     if (body->param.flags.has_opt ||
-	body->param.flags.has_post ||
-	body->param.flags.has_rest ||
-	body->param.flags.has_block ||
-	body->param.flags.has_kw ||
-	body->param.flags.has_kwrest) {
-
-	if (body->param.flags.has_block) {
-	    body->param.size = body->param.block_start + 1;
-	}
-	else if (body->param.flags.has_kwrest) {
-	    body->param.size = body->param.keyword->rest_start + 1;
-	}
-	else if (body->param.flags.has_kw) {
-	    body->param.size = body->param.keyword->bits_start + 1;
-	}
-	else if (body->param.flags.has_post) {
-	    body->param.size = body->param.post_start + body->param.post_num;
-	}
-	else if (body->param.flags.has_rest) {
-	    body->param.size = body->param.rest_start + 1;
-	}
-	else if (body->param.flags.has_opt) {
-	    body->param.size = body->param.lead_num + body->param.opt_num;
-	}
-	else {
+        body->param.flags.has_post ||
+        body->param.flags.has_rest ||
+        body->param.flags.has_block ||
+        body->param.flags.has_kw ||
+        body->param.flags.has_kwrest) {
+
+        if (body->param.flags.has_block) {
+            body->param.size = body->param.block_start + 1;
+        }
+        else if (body->param.flags.has_kwrest) {
+            body->param.size = body->param.keyword->rest_start + 1;
+        }
+        else if (body->param.flags.has_kw) {
+            body->param.size = body->param.keyword->bits_start + 1;
+        }
+        else if (body->param.flags.has_post) {
+            body->param.size = body->param.post_start + body->param.post_num;
+        }
+        else if (body->param.flags.has_rest) {
+            body->param.size = body->param.rest_start + 1;
+        }
+        else if (body->param.flags.has_opt) {
+            body->param.size = body->param.lead_num + body->param.opt_num;
+        }
+        else {
             UNREACHABLE;
-	}
+        }
     }
     else {
-	body->param.size = body->param.lead_num;
+        body->param.size = body->param.lead_num;
     }
 }
 
 static int
 iseq_set_arguments_keywords(rb_iseq_t *iseq, LINK_ANCHOR *const optargs,
-			    const struct rb_args_info *args, int arg_size)
+                            const struct rb_args_info *args, int arg_size)
 {
-    const NODE *node = args->kw_args;
+    const rb_node_kw_arg_t *node = args->kw_args;
     struct rb_iseq_constant_body *const body = ISEQ_BODY(iseq);
     struct rb_iseq_param_keyword *keyword;
-    const VALUE default_values = rb_ary_tmp_new(1);
+    const VALUE default_values = rb_ary_hidden_new(1);
     const VALUE complex_mark = rb_str_tmp_new(0);
     int kw = 0, rkw = 0, di = 0, i;
 
@@ -1751,72 +1985,110 @@ iseq_set_arguments_keywords(rb_iseq_t *iseq, LINK_ANCHOR *const optargs,
     body->param.keyword = keyword = ZALLOC_N(struct rb_iseq_param_keyword, 1);
 
     while (node) {
-	kw++;
-	node = node->nd_next;
+        kw++;
+        node = node->nd_next;
     }
     arg_size += kw;
     keyword->bits_start = arg_size++;
 
     node = args->kw_args;
     while (node) {
-	const NODE *val_node = node->nd_body->nd_value;
-	VALUE dv;
+        const NODE *val_node = get_nd_value(node->nd_body);
+        VALUE dv;
 
         if (val_node == NODE_SPECIAL_REQUIRED_KEYWORD) {
-	    ++rkw;
-	}
-	else {
-	    switch (nd_type(val_node)) {
-	      case NODE_LIT:
-		dv = val_node->nd_lit;
-		break;
-	      case NODE_NIL:
-		dv = Qnil;
-		break;
-	      case NODE_TRUE:
-		dv = Qtrue;
-		break;
-	      case NODE_FALSE:
-		dv = Qfalse;
-		break;
-	      default:
-                NO_CHECK(COMPILE_POPPED(optargs, "kwarg", node)); /* nd_type_p(node, NODE_KW_ARG) */
-		dv = complex_mark;
-	    }
-
-	    keyword->num = ++di;
-	    rb_ary_push(default_values, dv);
-	}
-
-	node = node->nd_next;
+            ++rkw;
+        }
+        else {
+            switch (nd_type(val_node)) {
+              case NODE_SYM:
+                dv = rb_node_sym_string_val(val_node);
+                break;
+              case NODE_REGX:
+                dv = rb_node_regx_string_val(val_node);
+                break;
+              case NODE_LINE:
+                dv = rb_node_line_lineno_val(val_node);
+                break;
+              case NODE_INTEGER:
+                dv = rb_node_integer_literal_val(val_node);
+                break;
+              case NODE_FLOAT:
+                dv = rb_node_float_literal_val(val_node);
+                break;
+              case NODE_RATIONAL:
+                dv = rb_node_rational_literal_val(val_node);
+                break;
+              case NODE_IMAGINARY:
+                dv = rb_node_imaginary_literal_val(val_node);
+                break;
+              case NODE_ENCODING:
+                dv = rb_node_encoding_val(val_node);
+                break;
+              case NODE_NIL:
+                dv = Qnil;
+                break;
+              case NODE_TRUE:
+                dv = Qtrue;
+                break;
+              case NODE_FALSE:
+                dv = Qfalse;
+                break;
+              default:
+                NO_CHECK(COMPILE_POPPED(optargs, "kwarg", RNODE(node))); /* nd_type_p(node, NODE_KW_ARG) */
+                dv = complex_mark;
+            }
+
+            keyword->num = ++di;
+            rb_ary_push(default_values, dv);
+        }
+
+        node = node->nd_next;
     }
 
     keyword->num = kw;
 
-    if (args->kw_rest_arg->nd_vid != 0) {
-	keyword->rest_start = arg_size++;
-	body->param.flags.has_kwrest = TRUE;
+    if (RNODE_DVAR(args->kw_rest_arg)->nd_vid != 0) {
+        ID kw_id = ISEQ_BODY(iseq)->local_table[arg_size];
+        keyword->rest_start = arg_size++;
+        body->param.flags.has_kwrest = TRUE;
+
+        if (kw_id == idPow) body->param.flags.anon_kwrest = TRUE;
     }
     keyword->required_num = rkw;
     keyword->table = &body->local_table[keyword->bits_start - keyword->num];
 
-    {
-	VALUE *dvs = ALLOC_N(VALUE, RARRAY_LEN(default_values));
+    if (RARRAY_LEN(default_values)) {
+        VALUE *dvs = ALLOC_N(VALUE, RARRAY_LEN(default_values));
 
-	for (i = 0; i < RARRAY_LEN(default_values); i++) {
-	    VALUE dv = RARRAY_AREF(default_values, i);
-	    if (dv == complex_mark) dv = Qundef;
-	    if (!SPECIAL_CONST_P(dv)) {
-		RB_OBJ_WRITTEN(iseq, Qundef, dv);
-	    }
-	    dvs[i] = dv;
-	}
+        for (i = 0; i < RARRAY_LEN(default_values); i++) {
+            VALUE dv = RARRAY_AREF(default_values, i);
+            if (dv == complex_mark) dv = Qundef;
+            if (!SPECIAL_CONST_P(dv)) rb_ractor_make_shareable(dv);
+            RB_OBJ_WRITE(iseq, &dvs[i], dv);
+        }
 
-	keyword->default_values = dvs;
+        keyword->default_values = dvs;
     }
     return arg_size;
 }
 
+static void
+iseq_set_use_block(rb_iseq_t *iseq)
+{
+    struct rb_iseq_constant_body *const body = ISEQ_BODY(iseq);
+    if (!body->param.flags.use_block) {
+        body->param.flags.use_block = 1;
+
+        rb_vm_t *vm = GET_VM();
+
+        if (!rb_warning_category_enabled_p(RB_WARN_CATEGORY_STRICT_UNUSED_BLOCK)) {
+            st_data_t key = (st_data_t)rb_intern_str(body->location.label); // String -> ID
+            set_insert(vm->unused_block_warning_table, key);
+        }
+    }
+}
+
 static int
 iseq_set_arguments(rb_iseq_t *iseq, LINK_ANCHOR *const optargs, const NODE *const node_args)
 {
@@ -1824,133 +2096,175 @@ iseq_set_arguments(rb_iseq_t *iseq, LINK_ANCHOR *const optargs, const NODE *cons
 
     if (node_args) {
         struct rb_iseq_constant_body *const body = ISEQ_BODY(iseq);
-	struct rb_args_info *args = node_args->nd_ainfo;
-	ID rest_id = 0;
-	int last_comma = 0;
-	ID block_id = 0;
-	int arg_size;
+        struct rb_args_info *args = &RNODE_ARGS(node_args)->nd_ainfo;
+        ID rest_id = 0;
+        int last_comma = 0;
+        ID block_id = 0;
+        int arg_size;
 
-	EXPECT_NODE("iseq_set_arguments", node_args, NODE_ARGS, COMPILE_NG);
+        EXPECT_NODE("iseq_set_arguments", node_args, NODE_ARGS, COMPILE_NG);
 
-        body->param.flags.ruby2_keywords = args->ruby2_keywords;
-	body->param.lead_num = arg_size = (int)args->pre_args_num;
-	if (body->param.lead_num > 0) body->param.flags.has_lead = TRUE;
-	debugs("  - argc: %d\n", body->param.lead_num);
+        body->param.lead_num = arg_size = (int)args->pre_args_num;
+        if (body->param.lead_num > 0) body->param.flags.has_lead = TRUE;
+        debugs("  - argc: %d\n", body->param.lead_num);
 
-	rest_id = args->rest_arg;
+        rest_id = args->rest_arg;
         if (rest_id == NODE_SPECIAL_EXCESSIVE_COMMA) {
-	    last_comma = 1;
-	    rest_id = 0;
-	}
-	block_id = args->block_arg;
-
-	if (args->opt_args) {
-	    const NODE *node = args->opt_args;
-	    LABEL *label;
-	    VALUE labels = rb_ary_tmp_new(1);
-	    VALUE *opt_table;
-	    int i = 0, j;
-
-	    while (node) {
-		label = NEW_LABEL(nd_line(node));
-		rb_ary_push(labels, (VALUE)label | 1);
-		ADD_LABEL(optargs, label);
+            last_comma = 1;
+            rest_id = 0;
+        }
+        block_id = args->block_arg;
+
+        bool optimized_forward = (args->forwarding && args->pre_args_num == 0 && !args->opt_args);
+
+        if (optimized_forward) {
+            rest_id = 0;
+            block_id = 0;
+        }
+
+        if (args->opt_args) {
+            const rb_node_opt_arg_t *node = args->opt_args;
+            LABEL *label;
+            VALUE labels = rb_ary_hidden_new(1);
+            VALUE *opt_table;
+            int i = 0, j;
+
+            while (node) {
+                label = NEW_LABEL(nd_line(RNODE(node)));
+                rb_ary_push(labels, (VALUE)label | 1);
+                ADD_LABEL(optargs, label);
                 NO_CHECK(COMPILE_POPPED(optargs, "optarg", node->nd_body));
-		node = node->nd_next;
-		i += 1;
-	    }
-
-	    /* last label */
-	    label = NEW_LABEL(nd_line(node_args));
-	    rb_ary_push(labels, (VALUE)label | 1);
-	    ADD_LABEL(optargs, label);
-
-	    opt_table = ALLOC_N(VALUE, i+1);
-
-            MEMCPY(opt_table, RARRAY_CONST_PTR_TRANSIENT(labels), VALUE, i+1);
-	    for (j = 0; j < i+1; j++) {
-		opt_table[j] &= ~1;
-	    }
-	    rb_ary_clear(labels);
-
-	    body->param.flags.has_opt = TRUE;
-	    body->param.opt_num = i;
-	    body->param.opt_table = opt_table;
-	    arg_size += i;
-	}
-
-	if (rest_id) {
-	    body->param.rest_start = arg_size++;
-	    body->param.flags.has_rest = TRUE;
-	    assert(body->param.rest_start != -1);
-	}
-
-	if (args->first_post_arg) {
-	    body->param.post_start = arg_size;
-	    body->param.post_num = args->post_args_num;
-	    body->param.flags.has_post = TRUE;
-	    arg_size += args->post_args_num;
-
-	    if (body->param.flags.has_rest) { /* TODO: why that? */
-		body->param.post_start = body->param.rest_start + 1;
-	    }
-	}
-
-	if (args->kw_args) {
-	    arg_size = iseq_set_arguments_keywords(iseq, optargs, args, arg_size);
-	}
-	else if (args->kw_rest_arg) {
-	    struct rb_iseq_param_keyword *keyword = ZALLOC_N(struct rb_iseq_param_keyword, 1);
-	    keyword->rest_start = arg_size++;
-	    body->param.keyword = keyword;
-	    body->param.flags.has_kwrest = TRUE;
-	}
-	else if (args->no_kwarg) {
-	    body->param.flags.accepts_no_kwarg = TRUE;
-	}
-
-	if (block_id) {
-	    body->param.block_start = arg_size++;
-	    body->param.flags.has_block = TRUE;
-	}
-
-	iseq_calc_param_size(iseq);
-	body->param.size = arg_size;
-
-	if (args->pre_init) { /* m_init */
+                node = node->nd_next;
+                i += 1;
+            }
+
+            /* last label */
+            label = NEW_LABEL(nd_line(node_args));
+            rb_ary_push(labels, (VALUE)label | 1);
+            ADD_LABEL(optargs, label);
+
+            opt_table = ALLOC_N(VALUE, i+1);
+
+            MEMCPY(opt_table, RARRAY_CONST_PTR(labels), VALUE, i+1);
+            for (j = 0; j < i+1; j++) {
+                opt_table[j] &= ~1;
+            }
+            rb_ary_clear(labels);
+
+            body->param.flags.has_opt = TRUE;
+            body->param.opt_num = i;
+            body->param.opt_table = opt_table;
+            arg_size += i;
+        }
+
+        if (rest_id) {
+            body->param.rest_start = arg_size++;
+            body->param.flags.has_rest = TRUE;
+            if (rest_id == '*') body->param.flags.anon_rest = TRUE;
+            RUBY_ASSERT(body->param.rest_start != -1);
+        }
+
+        if (args->first_post_arg) {
+            body->param.post_start = arg_size;
+            body->param.post_num = args->post_args_num;
+            body->param.flags.has_post = TRUE;
+            arg_size += args->post_args_num;
+
+            if (body->param.flags.has_rest) { /* TODO: why that? */
+                body->param.post_start = body->param.rest_start + 1;
+            }
+        }
+
+        if (args->kw_args) {
+            arg_size = iseq_set_arguments_keywords(iseq, optargs, args, arg_size);
+        }
+        else if (args->kw_rest_arg && !optimized_forward) {
+            ID kw_id = ISEQ_BODY(iseq)->local_table[arg_size];
+            struct rb_iseq_param_keyword *keyword = ZALLOC_N(struct rb_iseq_param_keyword, 1);
+            keyword->rest_start = arg_size++;
+            body->param.keyword = keyword;
+            body->param.flags.has_kwrest = TRUE;
+
+            static ID anon_kwrest = 0;
+            if (!anon_kwrest) anon_kwrest = rb_intern("**");
+            if (kw_id == anon_kwrest) body->param.flags.anon_kwrest = TRUE;
+        }
+        else if (args->no_kwarg) {
+            body->param.flags.accepts_no_kwarg = TRUE;
+        }
+
+        if (block_id) {
+            body->param.block_start = arg_size++;
+            body->param.flags.has_block = TRUE;
+            iseq_set_use_block(iseq);
+        }
+
+        // Only optimize specifically methods like this: `foo(...)`
+        if (optimized_forward) {
+            body->param.flags.use_block = 1;
+            body->param.flags.forwardable = TRUE;
+            arg_size = 1;
+        }
+
+        iseq_calc_param_size(iseq);
+        body->param.size = arg_size;
+
+        if (args->pre_init) { /* m_init */
             NO_CHECK(COMPILE_POPPED(optargs, "init arguments (m)", args->pre_init));
-	}
-	if (args->post_init) { /* p_init */
+        }
+        if (args->post_init) { /* p_init */
             NO_CHECK(COMPILE_POPPED(optargs, "init arguments (p)", args->post_init));
-	}
+        }
 
-	if (body->type == ISEQ_TYPE_BLOCK) {
-	    if (body->param.flags.has_opt    == FALSE &&
-		body->param.flags.has_post   == FALSE &&
-		body->param.flags.has_rest   == FALSE &&
-		body->param.flags.has_kw     == FALSE &&
-		body->param.flags.has_kwrest == FALSE) {
+        if (body->type == ISEQ_TYPE_BLOCK) {
+            if (body->param.flags.has_opt    == FALSE &&
+                body->param.flags.has_post   == FALSE &&
+                body->param.flags.has_rest   == FALSE &&
+                body->param.flags.has_kw     == FALSE &&
+                body->param.flags.has_kwrest == FALSE) {
 
-		if (body->param.lead_num == 1 && last_comma == 0) {
-		    /* {|a|} */
-		    body->param.flags.ambiguous_param0 = TRUE;
-		}
-	    }
-	}
+                if (body->param.lead_num == 1 && last_comma == 0) {
+                    /* {|a|} */
+                    body->param.flags.ambiguous_param0 = TRUE;
+                }
+            }
+        }
     }
 
     return COMPILE_OK;
 }
 
 static int
-iseq_set_local_table(rb_iseq_t *iseq, const rb_ast_id_table_t *tbl)
+iseq_set_local_table(rb_iseq_t *iseq, const rb_ast_id_table_t *tbl, const NODE *const node_args)
 {
     unsigned int size = tbl ? tbl->size : 0;
+    unsigned int offset = 0;
+
+    if (node_args) {
+        struct rb_args_info *args = &RNODE_ARGS(node_args)->nd_ainfo;
+
+        // If we have a function that only has `...` as the parameter,
+        // then its local table should only be `...`
+        // FIXME: I think this should be fixed in the AST rather than special case here.
+        if (args->forwarding && args->pre_args_num == 0 && !args->opt_args) {
+            CHECK(size >= 3);
+            size -= 3;
+            offset += 3;
+        }
+    }
 
     if (size > 0) {
-	ID *ids = (ID *)ALLOC_N(ID, size);
-	MEMCPY(ids, tbl->ids, ID, size);
+        ID *ids = ALLOC_N(ID, size);
+        MEMCPY(ids, tbl->ids + offset, ID, size);
         ISEQ_BODY(iseq)->local_table = ids;
+
+        enum lvar_state *states = ALLOC_N(enum lvar_state, size);
+        // fprintf(stderr, "iseq:%p states:%p size:%d\n", iseq, states, (int)size);
+        for (unsigned int i=0; i<size; i++) {
+            states[i] = lvar_uninitialized;
+            // fprintf(stderr, "id:%s\n", rb_id2name(ISEQ_BODY(iseq)->local_table[i]));
+        }
+        ISEQ_BODY(iseq)->lvar_states = states;
     }
     ISEQ_BODY(iseq)->local_table_size = size;
 
@@ -2058,18 +2372,24 @@ cdhash_set_label_i(VALUE key, VALUE val, VALUE ptr)
 static inline VALUE
 get_ivar_ic_value(rb_iseq_t *iseq,ID id)
 {
+    return INT2FIX(ISEQ_BODY(iseq)->ivc_size++);
+}
+
+static inline VALUE
+get_cvar_ic_value(rb_iseq_t *iseq,ID id)
+{
     VALUE val;
     struct rb_id_table *tbl = ISEQ_COMPILE_DATA(iseq)->ivar_cache_table;
     if (tbl) {
-	if (rb_id_table_lookup(tbl,id,&val)) {
-	    return val;
-	}
+        if (rb_id_table_lookup(tbl,id,&val)) {
+            return val;
+        }
     }
     else {
-	tbl = rb_id_table_create(1);
-	ISEQ_COMPILE_DATA(iseq)->ivar_cache_table = tbl;
+        tbl = rb_id_table_create(1);
+        ISEQ_COMPILE_DATA(iseq)->ivar_cache_table = tbl;
     }
-    val = INT2FIX(ISEQ_BODY(iseq)->is_size++);
+    val = INT2FIX(ISEQ_BODY(iseq)->icvarc_size++);
     rb_id_table_insert(tbl,id,val);
     return val;
 }
@@ -2090,113 +2410,113 @@ fix_sp_depth(rb_iseq_t *iseq, LINK_ANCHOR *const anchor)
     LINK_ELEMENT *list;
 
     for (list = FIRST_ELEMENT(anchor); list; list = list->next) {
-	if (IS_LABEL(list)) {
-	    LABEL *lobj = (LABEL *)list;
-	    lobj->set = TRUE;
-	}
+        if (IS_LABEL(list)) {
+            LABEL *lobj = (LABEL *)list;
+            lobj->set = TRUE;
+        }
     }
 
     for (list = FIRST_ELEMENT(anchor); list; list = list->next) {
-	switch (list->type) {
-	  case ISEQ_ELEMENT_INSN:
-	    {
-		int j, len, insn;
-		const char *types;
-		VALUE *operands;
-		INSN *iobj = (INSN *)list;
-
-		/* update sp */
-		sp = calc_sp_depth(sp, iobj);
-		if (sp < 0) {
-		    BADINSN_DUMP(anchor, list, NULL);
-		    COMPILE_ERROR(iseq, iobj->insn_info.line_no,
-				  "argument stack underflow (%d)", sp);
-		    return -1;
-		}
-		if (sp > stack_max) {
-		    stack_max = sp;
-		}
-
-		line = iobj->insn_info.line_no;
-		/* fprintf(stderr, "insn: %-16s, sp: %d\n", insn_name(iobj->insn_id), sp); */
-		operands = iobj->operands;
-		insn = iobj->insn_id;
-		types = insn_op_types(insn);
-		len = insn_len(insn);
-
-		/* operand check */
-		if (iobj->operand_size != len - 1) {
-		    /* printf("operand size miss! (%d, %d)\n", iobj->operand_size, len); */
-		    BADINSN_DUMP(anchor, list, NULL);
-		    COMPILE_ERROR(iseq, iobj->insn_info.line_no,
-				  "operand size miss! (%d for %d)",
-				  iobj->operand_size, len - 1);
-		    return -1;
-		}
-
-		for (j = 0; types[j]; j++) {
-		    if (types[j] == TS_OFFSET) {
-			/* label(destination position) */
-			LABEL *lobj = (LABEL *)operands[j];
-			if (!lobj->set) {
-			    BADINSN_DUMP(anchor, list, NULL);
-			    COMPILE_ERROR(iseq, iobj->insn_info.line_no,
-					  "unknown label: "LABEL_FORMAT, lobj->label_no);
-			    return -1;
-			}
-			if (lobj->sp == -1) {
-			    lobj->sp = sp;
+        switch (list->type) {
+          case ISEQ_ELEMENT_INSN:
+            {
+                int j, len, insn;
+                const char *types;
+                VALUE *operands;
+                INSN *iobj = (INSN *)list;
+
+                /* update sp */
+                sp = calc_sp_depth(sp, iobj);
+                if (sp < 0) {
+                    BADINSN_DUMP(anchor, list, NULL);
+                    COMPILE_ERROR(iseq, iobj->insn_info.line_no,
+                                  "argument stack underflow (%d)", sp);
+                    return -1;
+                }
+                if (sp > stack_max) {
+                    stack_max = sp;
+                }
+
+                line = iobj->insn_info.line_no;
+                /* fprintf(stderr, "insn: %-16s, sp: %d\n", insn_name(iobj->insn_id), sp); */
+                operands = iobj->operands;
+                insn = iobj->insn_id;
+                types = insn_op_types(insn);
+                len = insn_len(insn);
+
+                /* operand check */
+                if (iobj->operand_size != len - 1) {
+                    /* printf("operand size miss! (%d, %d)\n", iobj->operand_size, len); */
+                    BADINSN_DUMP(anchor, list, NULL);
+                    COMPILE_ERROR(iseq, iobj->insn_info.line_no,
+                                  "operand size miss! (%d for %d)",
+                                  iobj->operand_size, len - 1);
+                    return -1;
+                }
+
+                for (j = 0; types[j]; j++) {
+                    if (types[j] == TS_OFFSET) {
+                        /* label(destination position) */
+                        LABEL *lobj = (LABEL *)operands[j];
+                        if (!lobj->set) {
+                            BADINSN_DUMP(anchor, list, NULL);
+                            COMPILE_ERROR(iseq, iobj->insn_info.line_no,
+                                          "unknown label: "LABEL_FORMAT, lobj->label_no);
+                            return -1;
+                        }
+                        if (lobj->sp == -1) {
+                            lobj->sp = sp;
                         }
                         else if (lobj->sp != sp) {
                             debugs("%s:%d: sp inconsistency found but ignored (" LABEL_FORMAT " sp: %d, calculated sp: %d)\n",
                                    RSTRING_PTR(rb_iseq_path(iseq)), line,
                                    lobj->label_no, lobj->sp, sp);
                         }
-		    }
-		}
-		break;
-	    }
-	  case ISEQ_ELEMENT_LABEL:
-	    {
-		LABEL *lobj = (LABEL *)list;
-		if (lobj->sp == -1) {
-		    lobj->sp = sp;
-		}
-		else {
+                    }
+                }
+                break;
+            }
+          case ISEQ_ELEMENT_LABEL:
+            {
+                LABEL *lobj = (LABEL *)list;
+                if (lobj->sp == -1) {
+                    lobj->sp = sp;
+                }
+                else {
                     if (lobj->sp != sp) {
                         debugs("%s:%d: sp inconsistency found but ignored (" LABEL_FORMAT " sp: %d, calculated sp: %d)\n",
                                 RSTRING_PTR(rb_iseq_path(iseq)), line,
                                 lobj->label_no, lobj->sp, sp);
                     }
-		    sp = lobj->sp;
-		}
-		break;
-	    }
-	  case ISEQ_ELEMENT_TRACE:
-	    {
-		/* ignore */
-		break;
-	    }
-	  case ISEQ_ELEMENT_ADJUST:
-	    {
-		ADJUST *adjust = (ADJUST *)list;
-		int orig_sp = sp;
-
-		sp = adjust->label ? adjust->label->sp : 0;
-		if (adjust->line_no != -1 && orig_sp - sp < 0) {
-		    BADINSN_DUMP(anchor, list, NULL);
-		    COMPILE_ERROR(iseq, adjust->line_no,
-				  "iseq_set_sequence: adjust bug %d < %d",
-				  orig_sp, sp);
-		    return -1;
-		}
-		break;
-	    }
-	  default:
-	    BADINSN_DUMP(anchor, list, NULL);
-	    COMPILE_ERROR(iseq, line, "unknown list type: %d", list->type);
-	    return -1;
-	}
+                    sp = lobj->sp;
+                }
+                break;
+            }
+          case ISEQ_ELEMENT_TRACE:
+            {
+                /* ignore */
+                break;
+            }
+          case ISEQ_ELEMENT_ADJUST:
+            {
+                ADJUST *adjust = (ADJUST *)list;
+                int orig_sp = sp;
+
+                sp = adjust->label ? adjust->label->sp : 0;
+                if (adjust->line_no != -1 && orig_sp - sp < 0) {
+                    BADINSN_DUMP(anchor, list, NULL);
+                    COMPILE_ERROR(iseq, adjust->line_no,
+                                  "iseq_set_sequence: adjust bug %d < %d",
+                                  orig_sp, sp);
+                    return -1;
+                }
+                break;
+            }
+          default:
+            BADINSN_DUMP(anchor, list, NULL);
+            COMPILE_ERROR(iseq, line, "unknown list type: %d", list->type);
+            return -1;
+        }
     }
     return stack_max;
 }
@@ -2226,14 +2546,35 @@ static int
 add_adjust_info(struct iseq_insn_info_entry *insns_info, unsigned int *positions,
                 int insns_info_index, int code_index, const ADJUST *adjust)
 {
-    if (insns_info_index > 0 ||
-        insns_info[insns_info_index-1].line_no != adjust->line_no) {
-        insns_info[insns_info_index].line_no    = adjust->line_no;
-        insns_info[insns_info_index].events     = 0;
-        positions[insns_info_index]             = code_index;
-        return TRUE;
+    insns_info[insns_info_index].line_no    = adjust->line_no;
+    insns_info[insns_info_index].node_id    = -1;
+    insns_info[insns_info_index].events     = 0;
+    positions[insns_info_index]             = code_index;
+    return TRUE;
+}
+
+static ID *
+array_to_idlist(VALUE arr)
+{
+    RUBY_ASSERT(RB_TYPE_P(arr, T_ARRAY));
+    long size = RARRAY_LEN(arr);
+    ID *ids = (ID *)ALLOC_N(ID, size + 1);
+    for (long i = 0; i < size; i++) {
+        VALUE sym = RARRAY_AREF(arr, i);
+        ids[i] = SYM2ID(sym);
     }
-    return FALSE;
+    ids[size] = 0;
+    return ids;
+}
+
+static VALUE
+idlist_to_array(const ID *ids)
+{
+    VALUE arr = rb_ary_new();
+    while (*ids) {
+        rb_ary_push(arr, ID2SYM(*ids++));
+    }
+    return arr;
 }
 
 /**
@@ -2242,7 +2583,6 @@ add_adjust_info(struct iseq_insn_info_entry *insns_info, unsigned int *positions
 static int
 iseq_set_sequence(rb_iseq_t *iseq, LINK_ANCHOR *const anchor)
 {
-    VALUE iseqv = (VALUE)iseq;
     struct iseq_insn_info_entry *insns_info;
     struct rb_iseq_constant_body *const body = ISEQ_BODY(iseq);
     unsigned int *positions;
@@ -2259,20 +2599,20 @@ iseq_set_sequence(rb_iseq_t *iseq, LINK_ANCHOR *const anchor)
     /* fix label position */
     insn_num = code_index = 0;
     for (list = FIRST_ELEMENT(anchor); list; list = list->next) {
-	switch (list->type) {
-	  case ISEQ_ELEMENT_INSN:
-	    {
-		INSN *iobj = (INSN *)list;
-		/* update sp */
-		sp = calc_sp_depth(sp, iobj);
-		insn_num++;
+        switch (list->type) {
+          case ISEQ_ELEMENT_INSN:
+            {
+                INSN *iobj = (INSN *)list;
+                /* update sp */
+                sp = calc_sp_depth(sp, iobj);
+                insn_num++;
                 events = iobj->insn_info.events |= events;
                 if (ISEQ_COVERAGE(iseq)) {
                     if (ISEQ_LINE_COVERAGE(iseq) && (events & RUBY_EVENT_COVERAGE_LINE) &&
                         !(rb_get_coverage_mode() & COVERAGE_TARGET_ONESHOT_LINES)) {
-                        int line = iobj->insn_info.line_no;
-                        if (line >= 1) {
-                            RARRAY_ASET(ISEQ_LINE_COVERAGE(iseq), line - 1, INT2FIX(0));
+                        int line = iobj->insn_info.line_no - 1;
+                        if (line >= 0 && line < RARRAY_LEN(ISEQ_LINE_COVERAGE(iseq))) {
+                            RARRAY_ASET(ISEQ_LINE_COVERAGE(iseq), line, INT2FIX(0));
                         }
                     }
                     if (ISEQ_BRANCH_COVERAGE(iseq) && (events & RUBY_EVENT_COVERAGE_BRANCH)) {
@@ -2281,233 +2621,316 @@ iseq_set_sequence(rb_iseq_t *iseq, LINK_ANCHOR *const anchor)
                         }
                         RARRAY_ASET(ISEQ_PC2BRANCHINDEX(iseq), code_index, INT2FIX(data));
                     }
-		}
+                }
                 code_index += insn_data_length(iobj);
-		events = 0;
+                events = 0;
                 data = 0;
-		break;
-	    }
-	  case ISEQ_ELEMENT_LABEL:
-	    {
-		LABEL *lobj = (LABEL *)list;
-		lobj->position = code_index;
+                break;
+            }
+          case ISEQ_ELEMENT_LABEL:
+            {
+                LABEL *lobj = (LABEL *)list;
+                lobj->position = code_index;
                 if (lobj->sp != sp) {
                     debugs("%s: sp inconsistency found but ignored (" LABEL_FORMAT " sp: %d, calculated sp: %d)\n",
                            RSTRING_PTR(rb_iseq_path(iseq)),
                            lobj->label_no, lobj->sp, sp);
                 }
-		sp = lobj->sp;
-		break;
-	    }
-	  case ISEQ_ELEMENT_TRACE:
-	    {
-		TRACE *trace = (TRACE *)list;
-		events |= trace->event;
+                sp = lobj->sp;
+                break;
+            }
+          case ISEQ_ELEMENT_TRACE:
+            {
+                TRACE *trace = (TRACE *)list;
+                events |= trace->event;
                 if (trace->event & RUBY_EVENT_COVERAGE_BRANCH) data = trace->data;
-		break;
-	    }
-	  case ISEQ_ELEMENT_ADJUST:
-	    {
-		ADJUST *adjust = (ADJUST *)list;
-		if (adjust->line_no != -1) {
-		    int orig_sp = sp;
-		    sp = adjust->label ? adjust->label->sp : 0;
-		    if (orig_sp - sp > 0) {
-			if (orig_sp - sp > 1) code_index++; /* 1 operand */
-			code_index++; /* insn */
-			insn_num++;
-		    }
-		}
-		break;
-	    }
-	  default: break;
-	}
+                break;
+            }
+          case ISEQ_ELEMENT_ADJUST:
+            {
+                ADJUST *adjust = (ADJUST *)list;
+                if (adjust->line_no != -1) {
+                    int orig_sp = sp;
+                    sp = adjust->label ? adjust->label->sp : 0;
+                    if (orig_sp - sp > 0) {
+                        if (orig_sp - sp > 1) code_index++; /* 1 operand */
+                        code_index++; /* insn */
+                        insn_num++;
+                    }
+                }
+                break;
+            }
+          default: break;
+        }
     }
 
     /* make instruction sequence */
     generated_iseq = ALLOC_N(VALUE, code_index);
     insns_info = ALLOC_N(struct iseq_insn_info_entry, insn_num);
     positions = ALLOC_N(unsigned int, insn_num);
-    body->is_entries = ZALLOC_N(union iseq_inline_storage_entry, body->is_size);
-    body->call_data = ZALLOC_N(struct rb_call_data, body->ci_size);
+    if (ISEQ_IS_SIZE(body)) {
+        body->is_entries = ZALLOC_N(union iseq_inline_storage_entry, ISEQ_IS_SIZE(body));
+    }
+    else {
+        body->is_entries = NULL;
+    }
+
+    if (body->ci_size) {
+        body->call_data = ZALLOC_N(struct rb_call_data, body->ci_size);
+    }
+    else {
+        body->call_data = NULL;
+    }
     ISEQ_COMPILE_DATA(iseq)->ci_index = 0;
 
+    // Calculate the bitmask buffer size.
+    // Round the generated_iseq size up to the nearest multiple
+    // of the number of bits in an unsigned long.
+
+    // Allocate enough room for the bitmask list
+    iseq_bits_t * mark_offset_bits;
+    int code_size = code_index;
+
+    bool needs_bitmap = false;
+
+    if (ISEQ_MBITS_BUFLEN(code_index) == 1) {
+        mark_offset_bits = &ISEQ_COMPILE_DATA(iseq)->mark_bits.single;
+        ISEQ_COMPILE_DATA(iseq)->is_single_mark_bit = true;
+    }
+    else {
+        mark_offset_bits = ZALLOC_N(iseq_bits_t, ISEQ_MBITS_BUFLEN(code_index));
+        ISEQ_COMPILE_DATA(iseq)->mark_bits.list = mark_offset_bits;
+        ISEQ_COMPILE_DATA(iseq)->is_single_mark_bit = false;
+    }
+
+    ISEQ_COMPILE_DATA(iseq)->iseq_encoded = (void *)generated_iseq;
+    ISEQ_COMPILE_DATA(iseq)->iseq_size = code_index;
+
     list = FIRST_ELEMENT(anchor);
     insns_info_index = code_index = sp = 0;
 
     while (list) {
-	switch (list->type) {
-	  case ISEQ_ELEMENT_INSN:
-	    {
-		int j, len, insn;
-		const char *types;
-		VALUE *operands;
-		INSN *iobj = (INSN *)list;
-
-		/* update sp */
-		sp = calc_sp_depth(sp, iobj);
-		/* fprintf(stderr, "insn: %-16s, sp: %d\n", insn_name(iobj->insn_id), sp); */
-		operands = iobj->operands;
-		insn = iobj->insn_id;
-		generated_iseq[code_index] = insn;
-		types = insn_op_types(insn);
-		len = insn_len(insn);
-
-		for (j = 0; types[j]; j++) {
-		    char type = types[j];
-		    /* printf("--> [%c - (%d-%d)]\n", type, k, j); */
-		    switch (type) {
-		      case TS_OFFSET:
-			{
-			    /* label(destination position) */
-			    LABEL *lobj = (LABEL *)operands[j];
-			    generated_iseq[code_index + 1 + j] = lobj->position - (code_index + len);
-			    break;
-			}
-		      case TS_CDHASH:
-			{
-			    VALUE map = operands[j];
-			    struct cdhash_set_label_struct data;
+        switch (list->type) {
+          case ISEQ_ELEMENT_INSN:
+            {
+                int j, len, insn;
+                const char *types;
+                VALUE *operands;
+                INSN *iobj = (INSN *)list;
+
+                /* update sp */
+                sp = calc_sp_depth(sp, iobj);
+                /* fprintf(stderr, "insn: %-16s, sp: %d\n", insn_name(iobj->insn_id), sp); */
+                operands = iobj->operands;
+                insn = iobj->insn_id;
+                generated_iseq[code_index] = insn;
+                types = insn_op_types(insn);
+                len = insn_len(insn);
+
+                for (j = 0; types[j]; j++) {
+                    char type = types[j];
+
+                    /* printf("--> [%c - (%d-%d)]\n", type, k, j); */
+                    switch (type) {
+                      case TS_OFFSET:
+                        {
+                            /* label(destination position) */
+                            LABEL *lobj = (LABEL *)operands[j];
+                            generated_iseq[code_index + 1 + j] = lobj->position - (code_index + len);
+                            break;
+                        }
+                      case TS_CDHASH:
+                        {
+                            VALUE map = operands[j];
+                            struct cdhash_set_label_struct data;
                             data.hash = map;
                             data.pos = code_index;
                             data.len = len;
-			    rb_hash_foreach(map, cdhash_set_label_i, (VALUE)&data);
-
-			    rb_hash_rehash(map);
-			    freeze_hide_obj(map);
-			    generated_iseq[code_index + 1 + j] = map;
-			    RB_OBJ_WRITTEN(iseq, Qundef, map);
-                            FL_SET(iseqv, ISEQ_MARKABLE_ISEQ);
-			    break;
-			}
-		      case TS_LINDEX:
-		      case TS_NUM:	/* ulong */
-			generated_iseq[code_index + 1 + j] = FIX2INT(operands[j]);
-			break;
-		      case TS_VALUE:	/* VALUE */
-		      case TS_ISEQ:	/* iseq */
-			{
-			    VALUE v = operands[j];
-			    generated_iseq[code_index + 1 + j] = v;
-			    /* to mark ruby object */
-			    if (!SPECIAL_CONST_P(v)) {
-				RB_OBJ_WRITTEN(iseq, Qundef, v);
-                                FL_SET(iseqv, ISEQ_MARKABLE_ISEQ);
-			    }
-			    break;
-			}
-		      case TS_IC: /* inline cache */
-		      case TS_ISE: /* inline storage entry */
-              case TS_ICVARC: /* inline cvar cache */
-		      case TS_IVC: /* inline ivar cache */
-			{
-			    unsigned int ic_index = FIX2UINT(operands[j]);
-			    IC ic = (IC)&body->is_entries[ic_index];
-			    if (UNLIKELY(ic_index >= body->is_size)) {
+                            rb_hash_foreach(map, cdhash_set_label_i, (VALUE)&data);
+
+                            rb_hash_rehash(map);
+                            freeze_hide_obj(map);
+                            rb_ractor_make_shareable(map);
+                            generated_iseq[code_index + 1 + j] = map;
+                            ISEQ_MBITS_SET(mark_offset_bits, code_index + 1 + j);
+                            RB_OBJ_WRITTEN(iseq, Qundef, map);
+                            needs_bitmap = true;
+                            break;
+                        }
+                      case TS_LINDEX:
+                      case TS_NUM:	/* ulong */
+                        generated_iseq[code_index + 1 + j] = FIX2INT(operands[j]);
+                        break;
+                      case TS_ISEQ:	/* iseq */
+                      case TS_VALUE:	/* VALUE */
+                        {
+                            VALUE v = operands[j];
+                            generated_iseq[code_index + 1 + j] = v;
+                            /* to mark ruby object */
+                            if (!SPECIAL_CONST_P(v)) {
+                                RB_OBJ_WRITTEN(iseq, Qundef, v);
+                                ISEQ_MBITS_SET(mark_offset_bits, code_index + 1 + j);
+                                needs_bitmap = true;
+                            }
+                            break;
+                        }
+                      /* [ TS_IVC | TS_ICVARC | TS_ISE | TS_IC ] */
+                      case TS_IC: /* inline cache: constants */
+                        {
+                            unsigned int ic_index = ISEQ_COMPILE_DATA(iseq)->ic_index++;
+                            IC ic = &ISEQ_IS_ENTRY_START(body, type)[ic_index].ic_cache;
+                            if (UNLIKELY(ic_index >= body->ic_size)) {
+                                BADINSN_DUMP(anchor, &iobj->link, 0);
+                                COMPILE_ERROR(iseq, iobj->insn_info.line_no,
+                                              "iseq_set_sequence: ic_index overflow: index: %d, size: %d",
+                                              ic_index, ISEQ_IS_SIZE(body));
+                            }
+
+                            ic->segments = array_to_idlist(operands[j]);
+
+                            generated_iseq[code_index + 1 + j] = (VALUE)ic;
+                        }
+                        break;
+                      case TS_IVC: /* inline ivar cache */
+                        {
+                            unsigned int ic_index = FIX2UINT(operands[j]);
+
+                            IVC cache = ((IVC)&body->is_entries[ic_index]);
+
+                            if (insn == BIN(setinstancevariable)) {
+                                cache->iv_set_name = SYM2ID(operands[j - 1]);
+                            }
+                            else {
+                                cache->iv_set_name = 0;
+                            }
+
+                            vm_ic_attr_index_initialize(cache, INVALID_SHAPE_ID);
+                        }
+                      case TS_ISE: /* inline storage entry: `once` insn */
+                      case TS_ICVARC: /* inline cvar cache */
+                        {
+                            unsigned int ic_index = FIX2UINT(operands[j]);
+                            IC ic = &ISEQ_IS_ENTRY_START(body, type)[ic_index].ic_cache;
+                            if (UNLIKELY(ic_index >= ISEQ_IS_SIZE(body))) {
                                 BADINSN_DUMP(anchor, &iobj->link, 0);
                                 COMPILE_ERROR(iseq, iobj->insn_info.line_no,
                                               "iseq_set_sequence: ic_index overflow: index: %d, size: %d",
-                                              ic_index, body->is_size);
-			    }
-			    generated_iseq[code_index + 1 + j] = (VALUE)ic;
-                            FL_SET(iseqv, ISEQ_MARKABLE_ISEQ);
-
-                            if (insn == BIN(opt_getinlinecache) && type == TS_IC) {
-                                // Store the instruction index for opt_getinlinecache on the IC for
-                                // YJIT to invalidate code when opt_setinlinecache runs.
-                                ic->get_insn_idx = (unsigned int)code_index;
+                                              ic_index, ISEQ_IS_SIZE(body));
                             }
-			    break;
-			}
-                        case TS_CALLDATA:
+                            generated_iseq[code_index + 1 + j] = (VALUE)ic;
+
+                            break;
+                        }
+                      case TS_CALLDATA:
                         {
                             const struct rb_callinfo *source_ci = (const struct rb_callinfo *)operands[j];
+                            RUBY_ASSERT(ISEQ_COMPILE_DATA(iseq)->ci_index <= body->ci_size);
                             struct rb_call_data *cd = &body->call_data[ISEQ_COMPILE_DATA(iseq)->ci_index++];
-                            assert(ISEQ_COMPILE_DATA(iseq)->ci_index <= body->ci_size);
                             cd->ci = source_ci;
                             cd->cc = vm_cc_empty();
                             generated_iseq[code_index + 1 + j] = (VALUE)cd;
                             break;
                         }
-		      case TS_ID: /* ID */
-			generated_iseq[code_index + 1 + j] = SYM2ID(operands[j]);
-			break;
-		      case TS_FUNCPTR:
-			generated_iseq[code_index + 1 + j] = operands[j];
-			break;
+                      case TS_ID: /* ID */
+                        generated_iseq[code_index + 1 + j] = SYM2ID(operands[j]);
+                        break;
+                      case TS_FUNCPTR:
+                        generated_iseq[code_index + 1 + j] = operands[j];
+                        break;
                       case TS_BUILTIN:
                         generated_iseq[code_index + 1 + j] = operands[j];
                         break;
-		      default:
-			BADINSN_ERROR(iseq, iobj->insn_info.line_no,
-				      "unknown operand type: %c", type);
-			return COMPILE_NG;
-		    }
-		}
-		if (add_insn_info(insns_info, positions, insns_info_index, code_index, iobj)) insns_info_index++;
-		code_index += len;
-		break;
-	    }
-	  case ISEQ_ELEMENT_LABEL:
-	    {
-		LABEL *lobj = (LABEL *)list;
+                      default:
+                        BADINSN_ERROR(iseq, iobj->insn_info.line_no,
+                                      "unknown operand type: %c", type);
+                        return COMPILE_NG;
+                    }
+                }
+                if (add_insn_info(insns_info, positions, insns_info_index, code_index, iobj)) insns_info_index++;
+                code_index += len;
+                break;
+            }
+          case ISEQ_ELEMENT_LABEL:
+            {
+                LABEL *lobj = (LABEL *)list;
                 if (lobj->sp != sp) {
                     debugs("%s: sp inconsistency found but ignored (" LABEL_FORMAT " sp: %d, calculated sp: %d)\n",
                            RSTRING_PTR(rb_iseq_path(iseq)),
                            lobj->label_no, lobj->sp, sp);
                 }
-		sp = lobj->sp;
-		break;
-	    }
-	  case ISEQ_ELEMENT_ADJUST:
-	    {
-		ADJUST *adjust = (ADJUST *)list;
-		int orig_sp = sp;
-
-		if (adjust->label) {
-		    sp = adjust->label->sp;
-		}
-		else {
-		    sp = 0;
-		}
-
-		if (adjust->line_no != -1) {
-		    const int diff = orig_sp - sp;
-		    if (diff > 0) {
-			if (add_adjust_info(insns_info, positions, insns_info_index, code_index, adjust)) insns_info_index++;
-		    }
-		    if (diff > 1) {
-			generated_iseq[code_index++] = BIN(adjuststack);
-			generated_iseq[code_index++] = orig_sp - sp;
-		    }
-		    else if (diff == 1) {
-			generated_iseq[code_index++] = BIN(pop);
-		    }
-		    else if (diff < 0) {
-			int label_no = adjust->label ? adjust->label->label_no : -1;
-			xfree(generated_iseq);
-			xfree(insns_info);
-			xfree(positions);
-			debug_list(anchor, list);
-			COMPILE_ERROR(iseq, adjust->line_no,
-				      "iseq_set_sequence: adjust bug to %d %d < %d",
-				      label_no, orig_sp, sp);
-			return COMPILE_NG;
-		    }
-		}
-		break;
-	    }
-	  default:
-	    /* ignore */
-	    break;
-	}
-	list = list->next;
+                sp = lobj->sp;
+                break;
+            }
+          case ISEQ_ELEMENT_ADJUST:
+            {
+                ADJUST *adjust = (ADJUST *)list;
+                int orig_sp = sp;
+
+                if (adjust->label) {
+                    sp = adjust->label->sp;
+                }
+                else {
+                    sp = 0;
+                }
+
+                if (adjust->line_no != -1) {
+                    const int diff = orig_sp - sp;
+                    if (diff > 0) {
+                        if (insns_info_index == 0) {
+                            COMPILE_ERROR(iseq, adjust->line_no,
+                                          "iseq_set_sequence: adjust bug (ISEQ_ELEMENT_ADJUST must not be the first in iseq)");
+                        }
+                        if (add_adjust_info(insns_info, positions, insns_info_index, code_index, adjust)) insns_info_index++;
+                    }
+                    if (diff > 1) {
+                        generated_iseq[code_index++] = BIN(adjuststack);
+                        generated_iseq[code_index++] = orig_sp - sp;
+                    }
+                    else if (diff == 1) {
+                        generated_iseq[code_index++] = BIN(pop);
+                    }
+                    else if (diff < 0) {
+                        int label_no = adjust->label ? adjust->label->label_no : -1;
+                        xfree(generated_iseq);
+                        xfree(insns_info);
+                        xfree(positions);
+                        if (ISEQ_MBITS_BUFLEN(code_size) > 1) {
+                            xfree(mark_offset_bits);
+                        }
+                        debug_list(anchor, list);
+                        COMPILE_ERROR(iseq, adjust->line_no,
+                                      "iseq_set_sequence: adjust bug to %d %d < %d",
+                                      label_no, orig_sp, sp);
+                        return COMPILE_NG;
+                    }
+                }
+                break;
+            }
+          default:
+            /* ignore */
+            break;
+        }
+        list = list->next;
     }
 
     body->iseq_encoded = (void *)generated_iseq;
     body->iseq_size = code_index;
     body->stack_max = stack_max;
 
+    if (ISEQ_COMPILE_DATA(iseq)->is_single_mark_bit) {
+        body->mark_bits.single = ISEQ_COMPILE_DATA(iseq)->mark_bits.single;
+    }
+    else {
+        if (needs_bitmap) {
+            body->mark_bits.list = mark_offset_bits;
+        }
+        else {
+            body->mark_bits.list = NULL;
+            ISEQ_COMPILE_DATA(iseq)->mark_bits.list = NULL;
+            ruby_xfree(mark_offset_bits);
+        }
+    }
+
     /* get rid of memory leak when REALLOC failed */
     body->insns_info.body = insns_info;
     body->insns_info.positions = positions;
@@ -2541,44 +2964,54 @@ iseq_set_exception_table(rb_iseq_t *iseq)
     struct iseq_catch_table_entry *entry;
 
     ISEQ_BODY(iseq)->catch_table = NULL;
-    if (NIL_P(ISEQ_COMPILE_DATA(iseq)->catch_table_ary)) return COMPILE_OK;
-    tlen = (int)RARRAY_LEN(ISEQ_COMPILE_DATA(iseq)->catch_table_ary);
-    tptr = RARRAY_CONST_PTR_TRANSIENT(ISEQ_COMPILE_DATA(iseq)->catch_table_ary);
+
+    VALUE catch_table_ary = ISEQ_COMPILE_DATA(iseq)->catch_table_ary;
+    if (NIL_P(catch_table_ary)) return COMPILE_OK;
+    tlen = (int)RARRAY_LEN(catch_table_ary);
+    tptr = RARRAY_CONST_PTR(catch_table_ary);
 
     if (tlen > 0) {
-	struct iseq_catch_table *table = xmalloc(iseq_catch_table_bytes(tlen));
-	table->size = tlen;
-
-	for (i = 0; i < table->size; i++) {
-            ptr = RARRAY_CONST_PTR_TRANSIENT(tptr[i]);
-	    entry = UNALIGNED_MEMBER_PTR(table, entries[i]);
-	    entry->type = (enum catch_type)(ptr[0] & 0xffff);
-	    entry->start = label_get_position((LABEL *)(ptr[1] & ~1));
-	    entry->end = label_get_position((LABEL *)(ptr[2] & ~1));
-	    entry->iseq = (rb_iseq_t *)ptr[3];
-	    RB_OBJ_WRITTEN(iseq, Qundef, entry->iseq);
-
-	    /* stack depth */
-	    if (ptr[4]) {
-		LABEL *lobj = (LABEL *)(ptr[4] & ~1);
-		entry->cont = label_get_position(lobj);
-		entry->sp = label_get_sp(lobj);
-
-		/* TODO: Dirty Hack!  Fix me */
-		if (entry->type == CATCH_TYPE_RESCUE ||
-		    entry->type == CATCH_TYPE_BREAK ||
-		    entry->type == CATCH_TYPE_NEXT) {
-		    entry->sp--;
-		}
-	    }
-	    else {
-		entry->cont = 0;
-	    }
-	}
+        struct iseq_catch_table *table = xmalloc(iseq_catch_table_bytes(tlen));
+        table->size = tlen;
+
+        for (i = 0; i < table->size; i++) {
+            int pos;
+            ptr = RARRAY_CONST_PTR(tptr[i]);
+            entry = UNALIGNED_MEMBER_PTR(table, entries[i]);
+            entry->type = (enum rb_catch_type)(ptr[0] & 0xffff);
+            pos = label_get_position((LABEL *)(ptr[1] & ~1));
+            RUBY_ASSERT(pos >= 0);
+            entry->start = (unsigned int)pos;
+            pos = label_get_position((LABEL *)(ptr[2] & ~1));
+            RUBY_ASSERT(pos >= 0);
+            entry->end = (unsigned int)pos;
+            entry->iseq = (rb_iseq_t *)ptr[3];
+            RB_OBJ_WRITTEN(iseq, Qundef, entry->iseq);
+
+            /* stack depth */
+            if (ptr[4]) {
+                LABEL *lobj = (LABEL *)(ptr[4] & ~1);
+                entry->cont = label_get_position(lobj);
+                entry->sp = label_get_sp(lobj);
+
+                /* TODO: Dirty Hack!  Fix me */
+                if (entry->type == CATCH_TYPE_RESCUE ||
+                    entry->type == CATCH_TYPE_BREAK ||
+                    entry->type == CATCH_TYPE_NEXT) {
+                    RUBY_ASSERT(entry->sp > 0);
+                    entry->sp--;
+                }
+            }
+            else {
+                entry->cont = 0;
+            }
+        }
         ISEQ_BODY(iseq)->catch_table = table;
-	RB_OBJ_WRITE(iseq, &ISEQ_COMPILE_DATA(iseq)->catch_table_ary, 0); /* free */
+        RB_OBJ_WRITE(iseq, &ISEQ_COMPILE_DATA(iseq)->catch_table_ary, 0); /* free */
     }
 
+    RB_GC_GUARD(catch_table_ary);
+
     return COMPILE_OK;
 }
 
@@ -2599,8 +3032,8 @@ iseq_set_optargs_table(rb_iseq_t *iseq)
 
     if (ISEQ_BODY(iseq)->param.flags.has_opt) {
         for (i = 0; i < ISEQ_BODY(iseq)->param.opt_num + 1; i++) {
-	    opt_table[i] = label_get_position((LABEL *)opt_table[i]);
-	}
+            opt_table[i] = label_get_position((LABEL *)opt_table[i]);
+        }
     }
     return COMPILE_OK;
 }
@@ -2614,27 +3047,27 @@ get_destination_insn(INSN *iobj)
 
     list = lobj->link.next;
     while (list) {
-	switch (list->type) {
-	  case ISEQ_ELEMENT_INSN:
-	  case ISEQ_ELEMENT_ADJUST:
-	    goto found;
-	  case ISEQ_ELEMENT_LABEL:
-	    /* ignore */
-	    break;
-	  case ISEQ_ELEMENT_TRACE:
-	    {
-		TRACE *trace = (TRACE *)list;
-		events |= trace->event;
-	    }
-	    break;
-	  default: break;
-	}
-	list = list->next;
+        switch (list->type) {
+          case ISEQ_ELEMENT_INSN:
+          case ISEQ_ELEMENT_ADJUST:
+            goto found;
+          case ISEQ_ELEMENT_LABEL:
+            /* ignore */
+            break;
+          case ISEQ_ELEMENT_TRACE:
+            {
+                TRACE *trace = (TRACE *)list;
+                events |= trace->event;
+            }
+            break;
+          default: break;
+        }
+        list = list->next;
     }
   found:
     if (list && IS_INSN(list)) {
-	INSN *iobj = (INSN *)list;
-	iobj->insn_info.events |= events;
+        INSN *iobj = (INSN *)list;
+        iobj->insn_info.events |= events;
     }
     return list;
 }
@@ -2645,10 +3078,10 @@ get_next_insn(INSN *iobj)
     LINK_ELEMENT *list = iobj->link.next;
 
     while (list) {
-	if (IS_INSN(list) || IS_ADJUST(list)) {
-	    return list;
-	}
-	list = list->next;
+        if (IS_INSN(list) || IS_ADJUST(list)) {
+            return list;
+        }
+        list = list->next;
     }
     return 0;
 }
@@ -2659,10 +3092,10 @@ get_prev_insn(INSN *iobj)
     LINK_ELEMENT *list = iobj->link.prev;
 
     while (list) {
-	if (IS_INSN(list) || IS_ADJUST(list)) {
-	    return list;
-	}
-	list = list->prev;
+        if (IS_INSN(list) || IS_ADJUST(list)) {
+            return list;
+        }
+        list = list->prev;
     }
     return 0;
 }
@@ -2675,16 +3108,18 @@ unref_destination(INSN *iobj, int pos)
     if (!lobj->refcnt) ELEM_REMOVE(&lobj->link);
 }
 
-static void
+static bool
 replace_destination(INSN *dobj, INSN *nobj)
 {
     VALUE n = OPERAND_AT(nobj, 0);
     LABEL *dl = (LABEL *)OPERAND_AT(dobj, 0);
     LABEL *nl = (LABEL *)n;
+    if (dl == nl) return false;
     --dl->refcnt;
     ++nl->refcnt;
     OPERAND_AT(dobj, 0) = n;
     if (!dl->refcnt) ELEM_REMOVE(&dl->link);
+    return true;
 }
 
 static LABEL*
@@ -2692,9 +3127,9 @@ find_destination(INSN *i)
 {
     int pos, len = insn_len(i->insn_id);
     for (pos = 0; pos < len; ++pos) {
-	if (insn_op_types(i->insn_id)[pos] == TS_OFFSET) {
-	    return (LABEL *)OPERAND_AT(i, pos);
-	}
+        if (insn_op_types(i->insn_id)[pos] == TS_OFFSET) {
+            return (LABEL *)OPERAND_AT(i, pos);
+        }
     }
     return 0;
 }
@@ -2710,53 +3145,51 @@ remove_unreachable_chunk(rb_iseq_t *iseq, LINK_ELEMENT *i)
     MEMZERO(unref_counts, int, nlabels);
     end = i;
     do {
-	LABEL *lab;
-	if (IS_INSN(i)) {
-	    if (IS_INSN_ID(i, leave)) {
-		end = i;
-		break;
-	    }
-	    else if ((lab = find_destination((INSN *)i)) != 0) {
-		if (lab->unremovable) break;
-		unref_counts[lab->label_no]++;
-	    }
-	}
-	else if (IS_LABEL(i)) {
-	    lab = (LABEL *)i;
-	    if (lab->unremovable) return 0;
-	    if (lab->refcnt > unref_counts[lab->label_no]) {
-		if (i == first) return 0;
-		break;
-	    }
-	    continue;
-	}
-	else if (IS_TRACE(i)) {
-	    /* do nothing */
-	}
-	else if (IS_ADJUST(i)) {
-	    LABEL *dest = ((ADJUST *)i)->label;
-	    if (dest && dest->unremovable) return 0;
-	}
-	end = i;
+        LABEL *lab;
+        if (IS_INSN(i)) {
+            if (IS_INSN_ID(i, leave)) {
+                end = i;
+                break;
+            }
+            else if ((lab = find_destination((INSN *)i)) != 0) {
+                unref_counts[lab->label_no]++;
+            }
+        }
+        else if (IS_LABEL(i)) {
+            lab = (LABEL *)i;
+            if (lab->unremovable) return 0;
+            if (lab->refcnt > unref_counts[lab->label_no]) {
+                if (i == first) return 0;
+                break;
+            }
+            continue;
+        }
+        else if (IS_TRACE(i)) {
+            /* do nothing */
+        }
+        else if (IS_ADJUST(i)) {
+            return 0;
+        }
+        end = i;
     } while ((i = i->next) != 0);
     i = first;
     do {
-	if (IS_INSN(i)) {
+        if (IS_INSN(i)) {
             struct rb_iseq_constant_body *body = ISEQ_BODY(iseq);
-	    VALUE insn = INSN_OF(i);
-	    int pos, len = insn_len(insn);
-	    for (pos = 0; pos < len; ++pos) {
-		switch (insn_op_types(insn)[pos]) {
-		  case TS_OFFSET:
-		    unref_destination((INSN *)i, pos);
-		    break;
+            VALUE insn = INSN_OF(i);
+            int pos, len = insn_len(insn);
+            for (pos = 0; pos < len; ++pos) {
+                switch (insn_op_types(insn)[pos]) {
+                  case TS_OFFSET:
+                    unref_destination((INSN *)i, pos);
+                    break;
                   case TS_CALLDATA:
                     --(body->ci_size);
-		    break;
-		}
-	    }
-	}
-	ELEM_REMOVE(i);
+                    break;
+                }
+            }
+        }
+        ELEM_REMOVE(i);
     } while ((i != end) && (i = i->next) != 0);
     return 1;
 }
@@ -2766,21 +3199,21 @@ iseq_pop_newarray(rb_iseq_t *iseq, INSN *iobj)
 {
     switch (OPERAND_AT(iobj, 0)) {
       case INT2FIX(0): /* empty array */
-	ELEM_REMOVE(&iobj->link);
-	return TRUE;
+        ELEM_REMOVE(&iobj->link);
+        return TRUE;
       case INT2FIX(1): /* single element array */
-	ELEM_REMOVE(&iobj->link);
-	return FALSE;
+        ELEM_REMOVE(&iobj->link);
+        return FALSE;
       default:
-	iobj->insn_id = BIN(adjuststack);
-	return TRUE;
+        iobj->insn_id = BIN(adjuststack);
+        return TRUE;
     }
 }
 
 static int
 is_frozen_putstring(INSN *insn, VALUE *op)
 {
-    if (IS_INSN_ID(insn, putstring)) {
+    if (IS_INSN_ID(insn, putstring) || IS_INSN_ID(insn, putchilledstring)) {
         *op = OPERAND_AT(insn, 0);
         return 1;
     }
@@ -2792,6 +3225,25 @@ is_frozen_putstring(INSN *insn, VALUE *op)
 }
 
 static int
+insn_has_label_before(LINK_ELEMENT *elem)
+{
+    LINK_ELEMENT *prev = elem->prev;
+    while (prev) {
+        if (prev->type == ISEQ_ELEMENT_LABEL) {
+            LABEL *label = (LABEL *)prev;
+            if (label->refcnt > 0) {
+                return 1;
+            }
+        }
+        else if (prev->type == ISEQ_ELEMENT_INSN) {
+            break;
+        }
+        prev = prev->prev;
+    }
+    return 0;
+}
+
+static int
 optimize_checktype(rb_iseq_t *iseq, INSN *iobj)
 {
     /*
@@ -2822,59 +3274,59 @@ optimize_checktype(rb_iseq_t *iseq, INSN *iobj)
 
     switch (INSN_OF(iobj)) {
       case BIN(putstring):
-	type = INT2FIX(T_STRING);
-	break;
+      case BIN(putchilledstring):
+        type = INT2FIX(T_STRING);
+        break;
       case BIN(putnil):
-	type = INT2FIX(T_NIL);
-	break;
+        type = INT2FIX(T_NIL);
+        break;
       case BIN(putobject):
-	type = INT2FIX(TYPE(OPERAND_AT(iobj, 0)));
-	break;
+        type = INT2FIX(TYPE(OPERAND_AT(iobj, 0)));
+        break;
       default: return FALSE;
     }
 
     ciobj = (INSN *)get_next_insn(iobj);
     if (IS_INSN_ID(ciobj, jump)) {
-	ciobj = (INSN *)get_next_insn((INSN*)OPERAND_AT(ciobj, 0));
+        ciobj = (INSN *)get_next_insn((INSN*)OPERAND_AT(ciobj, 0));
     }
     if (IS_INSN_ID(ciobj, dup)) {
-	ciobj = (INSN *)get_next_insn(dup = ciobj);
+        ciobj = (INSN *)get_next_insn(dup = ciobj);
     }
     if (!ciobj || !IS_INSN_ID(ciobj, checktype)) return FALSE;
     niobj = (INSN *)get_next_insn(ciobj);
     if (!niobj) {
-	/* TODO: putobject true/false */
-	return FALSE;
+        /* TODO: putobject true/false */
+        return FALSE;
     }
     switch (INSN_OF(niobj)) {
       case BIN(branchif):
-	if (OPERAND_AT(ciobj, 0) == type) {
-	    dest = (LABEL *)OPERAND_AT(niobj, 0);
-	}
-	break;
+        if (OPERAND_AT(ciobj, 0) == type) {
+            dest = (LABEL *)OPERAND_AT(niobj, 0);
+        }
+        break;
       case BIN(branchunless):
-	if (OPERAND_AT(ciobj, 0) != type) {
-	    dest = (LABEL *)OPERAND_AT(niobj, 0);
-	}
-	break;
+        if (OPERAND_AT(ciobj, 0) != type) {
+            dest = (LABEL *)OPERAND_AT(niobj, 0);
+        }
+        break;
       default:
         return FALSE;
     }
     line = ciobj->insn_info.line_no;
     node_id = ciobj->insn_info.node_id;
-    NODE dummy_line_node = generate_dummy_line_node(line, node_id);
     if (!dest) {
-	if (niobj->link.next && IS_LABEL(niobj->link.next)) {
-	    dest = (LABEL *)niobj->link.next; /* reuse label */
-	}
-	else {
-	    dest = NEW_LABEL(line);
-	    ELEM_INSERT_NEXT(&niobj->link, &dest->link);
-	}
-    }
-    INSERT_AFTER_INSN1(iobj, &dummy_line_node, jump, dest);
+        if (niobj->link.next && IS_LABEL(niobj->link.next)) {
+            dest = (LABEL *)niobj->link.next; /* reuse label */
+        }
+        else {
+            dest = NEW_LABEL(line);
+            ELEM_INSERT_NEXT(&niobj->link, &dest->link);
+        }
+    }
+    INSERT_AFTER_INSN1(iobj, line, node_id, jump, dest);
     LABEL_REF(dest);
-    if (!dup) INSERT_AFTER_INSN(iobj, &dummy_line_node, pop);
+    if (!dup) INSERT_AFTER_INSN(iobj, line, node_id, pop);
     return TRUE;
 }
 
@@ -2900,6 +3352,8 @@ ci_argc_set(const rb_iseq_t *iseq, const struct rb_callinfo *ci, int argc)
     return nci;
 }
 
+#define vm_ci_simple(ci) (vm_ci_flag(ci) & VM_CALL_ARGS_SIMPLE)
+
 static int
 iseq_peephole_optimize(rb_iseq_t *iseq, LINK_ELEMENT *list, const int do_tailcallopt)
 {
@@ -2910,112 +3364,111 @@ iseq_peephole_optimize(rb_iseq_t *iseq, LINK_ELEMENT *list, const int do_tailcal
 
     if (IS_INSN_ID(iobj, jump)) {
         INSN *niobj, *diobj, *piobj;
-	diobj = (INSN *)get_destination_insn(iobj);
-	niobj = (INSN *)get_next_insn(iobj);
-
-	if (diobj == niobj) {
-	    /*
-	     *   jump LABEL
-	     *  LABEL:
-	     * =>
-	     *   LABEL:
-	     */
-	    unref_destination(iobj, 0);
-	    ELEM_REMOVE(&iobj->link);
-	    return COMPILE_OK;
-	}
+        diobj = (INSN *)get_destination_insn(iobj);
+        niobj = (INSN *)get_next_insn(iobj);
+
+        if (diobj == niobj) {
+            /*
+             *   jump LABEL
+             *  LABEL:
+             * =>
+             *   LABEL:
+             */
+            unref_destination(iobj, 0);
+            ELEM_REMOVE(&iobj->link);
+            return COMPILE_OK;
+        }
         else if (iobj != diobj && IS_INSN(&diobj->link) &&
                  IS_INSN_ID(diobj, jump) &&
-		 OPERAND_AT(iobj, 0) != OPERAND_AT(diobj, 0) &&
+                 OPERAND_AT(iobj, 0) != OPERAND_AT(diobj, 0) &&
                  diobj->insn_info.events == 0) {
-	    /*
-	     *  useless jump elimination:
-	     *     jump LABEL1
-	     *     ...
-	     *   LABEL1:
-	     *     jump LABEL2
-	     *
-	     *   => in this case, first jump instruction should jump to
-	     *      LABEL2 directly
-	     */
-	    replace_destination(iobj, diobj);
-	    remove_unreachable_chunk(iseq, iobj->link.next);
-	    goto again;
-	}
+            /*
+             *  useless jump elimination:
+             *     jump LABEL1
+             *     ...
+             *   LABEL1:
+             *     jump LABEL2
+             *
+             *   => in this case, first jump instruction should jump to
+             *      LABEL2 directly
+             */
+            if (replace_destination(iobj, diobj)) {
+                remove_unreachable_chunk(iseq, iobj->link.next);
+                goto again;
+            }
+        }
         else if (IS_INSN_ID(diobj, leave)) {
-	    /*
-	     *  jump LABEL
-	     *  ...
-	     * LABEL:
-	     *  leave
-	     * =>
-	     *  leave
-	     *  ...
-	     * LABEL:
-	     *  leave
-	     */
-	    /* replace */
-	    unref_destination(iobj, 0);
+            /*
+             *  jump LABEL
+             *  ...
+             * LABEL:
+             *  leave
+             * =>
+             *  leave
+             *  ...
+             * LABEL:
+             *  leave
+             */
+            /* replace */
+            unref_destination(iobj, 0);
             iobj->insn_id = BIN(leave);
-	    iobj->operand_size = 0;
-	    iobj->insn_info = diobj->insn_info;
-	    goto again;
-	}
+            iobj->operand_size = 0;
+            iobj->insn_info = diobj->insn_info;
+            goto again;
+        }
         else if (IS_INSN(iobj->link.prev) &&
                  (piobj = (INSN *)iobj->link.prev) &&
-		 (IS_INSN_ID(piobj, branchif) ||
-		  IS_INSN_ID(piobj, branchunless))) {
-	    INSN *pdiobj = (INSN *)get_destination_insn(piobj);
-	    if (niobj == pdiobj) {
-		int refcnt = IS_LABEL(piobj->link.next) ?
-		    ((LABEL *)piobj->link.next)->refcnt : 0;
-		/*
-		 * useless jump elimination (if/unless destination):
-		 *   if   L1
-		 *   jump L2
-		 * L1:
-		 *   ...
-		 * L2:
-		 *
-		 * ==>
-		 *   unless L2
-		 * L1:
-		 *   ...
-		 * L2:
-		 */
-		piobj->insn_id = (IS_INSN_ID(piobj, branchif))
-		  ? BIN(branchunless) : BIN(branchif);
-		replace_destination(piobj, iobj);
-		if (refcnt <= 1) {
-		    ELEM_REMOVE(&iobj->link);
-		}
-		else {
-		    /* TODO: replace other branch destinations too */
-		}
-		return COMPILE_OK;
-	    }
-	    else if (diobj == pdiobj) {
-		/*
-		 * useless jump elimination (if/unless before jump):
-		 * L1:
-		 *   ...
-		 *   if   L1
-		 *   jump L1
-		 *
-		 * ==>
-		 * L1:
-		 *   ...
-		 *   pop
-		 *   jump L1
-		 */
-                NODE dummy_line_node = generate_dummy_line_node(iobj->insn_info.line_no, iobj->insn_info.node_id);
-		INSN *popiobj = new_insn_core(iseq, &dummy_line_node, BIN(pop), 0, 0);
-		ELEM_REPLACE(&piobj->link, &popiobj->link);
-	    }
-	}
-	if (remove_unreachable_chunk(iseq, iobj->link.next)) {
-	    goto again;
-	}
+                 (IS_INSN_ID(piobj, branchif) ||
+                  IS_INSN_ID(piobj, branchunless))) {
+            INSN *pdiobj = (INSN *)get_destination_insn(piobj);
+            if (niobj == pdiobj) {
+                int refcnt = IS_LABEL(piobj->link.next) ?
+                    ((LABEL *)piobj->link.next)->refcnt : 0;
+                /*
+                 * useless jump elimination (if/unless destination):
+                 *   if   L1
+                 *   jump L2
+                 * L1:
+                 *   ...
+                 * L2:
+                 *
+                 * ==>
+                 *   unless L2
+                 * L1:
+                 *   ...
+                 * L2:
+                 */
+                piobj->insn_id = (IS_INSN_ID(piobj, branchif))
+                  ? BIN(branchunless) : BIN(branchif);
+                if (replace_destination(piobj, iobj) && refcnt <= 1) {
+                    ELEM_REMOVE(&iobj->link);
+                }
+                else {
+                    /* TODO: replace other branch destinations too */
+                }
+                return COMPILE_OK;
+            }
+            else if (diobj == pdiobj) {
+                /*
+                 * useless jump elimination (if/unless before jump):
+                 * L1:
+                 *   ...
+                 *   if   L1
+                 *   jump L1
+                 *
+                 * ==>
+                 * L1:
+                 *   ...
+                 *   pop
+                 *   jump L1
+                 */
+                INSN *popiobj = new_insn_core(iseq, iobj->insn_info.line_no, iobj->insn_info.node_id, BIN(pop), 0, 0);
+                ELEM_REPLACE(&piobj->link, &popiobj->link);
+            }
+        }
+        if (remove_unreachable_chunk(iseq, iobj->link.next)) {
+            goto again;
+        }
     }
 
     /*
@@ -3035,50 +3488,134 @@ iseq_peephole_optimize(rb_iseq_t *iseq, LINK_ELEMENT *list, const int do_tailcal
         if ((end = (INSN *)get_prev_insn(range)) != 0 &&
                 is_frozen_putstring(end, &str_end) &&
                 (beg = (INSN *)get_prev_insn(end)) != 0 &&
-                is_frozen_putstring(beg, &str_beg)) {
-	    int excl = FIX2INT(OPERAND_AT(range, 0));
-	    VALUE lit_range = rb_range_new(str_beg, str_end, excl);
-
-	    ELEM_REMOVE(&beg->link);
-	    ELEM_REMOVE(&end->link);
-	    range->insn_id = BIN(putobject);
-	    OPERAND_AT(range, 0) = lit_range;
-	    RB_OBJ_WRITTEN(iseq, Qundef, lit_range);
-	}
+                is_frozen_putstring(beg, &str_beg) &&
+                !(insn_has_label_before(&beg->link) || insn_has_label_before(&end->link))) {
+            int excl = FIX2INT(OPERAND_AT(range, 0));
+            VALUE lit_range = RB_OBJ_SET_SHAREABLE(rb_range_new(str_beg, str_end, excl));
+
+            ELEM_REMOVE(&beg->link);
+            ELEM_REMOVE(&end->link);
+            range->insn_id = BIN(putobject);
+            OPERAND_AT(range, 0) = lit_range;
+            RB_OBJ_WRITTEN(iseq, Qundef, lit_range);
+        }
     }
 
     if (IS_INSN_ID(iobj, leave)) {
-	remove_unreachable_chunk(iseq, iobj->link.next);
+        remove_unreachable_chunk(iseq, iobj->link.next);
     }
 
     /*
      *  ...
      *  duparray [...]
-     *  concatarray
+     *  concatarray | concattoarray
      * =>
      *  ...
      *  putobject [...]
-     *  concatarray
+     *  concatarray | concattoarray
      */
     if (IS_INSN_ID(iobj, duparray)) {
         LINK_ELEMENT *next = iobj->link.next;
-        if (IS_INSN(next) && IS_INSN_ID(next, concatarray)) {
+        if (IS_INSN(next) && (IS_INSN_ID(next, concatarray) || IS_INSN_ID(next, concattoarray))) {
             iobj->insn_id = BIN(putobject);
         }
     }
 
+    /*
+     * duparray [...]
+     * send     <calldata!mid:freeze, argc:0, ARGS_SIMPLE>, nil
+     * =>
+     * opt_ary_freeze [...], <calldata!mid:freeze, argc:0, ARGS_SIMPLE>
+     */
+    if (IS_INSN_ID(iobj, duparray)) {
+        LINK_ELEMENT *next = iobj->link.next;
+        if (IS_INSN(next) && (IS_INSN_ID(next, send))) {
+            const struct rb_callinfo *ci = (struct rb_callinfo *)OPERAND_AT(next, 0);
+            const rb_iseq_t *blockiseq = (rb_iseq_t *)OPERAND_AT(next, 1);
+
+            if (vm_ci_simple(ci) && vm_ci_argc(ci) == 0 && blockiseq == NULL && vm_ci_mid(ci) == idFreeze) {
+                VALUE ary = iobj->operands[0];
+                rb_obj_reveal(ary, rb_cArray);
+
+                insn_replace_with_operands(iseq, iobj, BIN(opt_ary_freeze), 2, ary, (VALUE)ci);
+                ELEM_REMOVE(next);
+            }
+        }
+    }
+
+    /*
+     * duphash {...}
+     * send     <calldata!mid:freeze, argc:0, ARGS_SIMPLE>, nil
+     * =>
+     * opt_hash_freeze {...}, <calldata!mid:freeze, argc:0, ARGS_SIMPLE>
+     */
+    if (IS_INSN_ID(iobj, duphash)) {
+        LINK_ELEMENT *next = iobj->link.next;
+        if (IS_INSN(next) && (IS_INSN_ID(next, send))) {
+            const struct rb_callinfo *ci = (struct rb_callinfo *)OPERAND_AT(next, 0);
+            const rb_iseq_t *blockiseq = (rb_iseq_t *)OPERAND_AT(next, 1);
+
+            if (vm_ci_simple(ci) && vm_ci_argc(ci) == 0 && blockiseq == NULL && vm_ci_mid(ci) == idFreeze) {
+                VALUE hash = iobj->operands[0];
+                rb_obj_reveal(hash, rb_cHash);
+                RB_OBJ_SET_SHAREABLE(hash);
+
+                insn_replace_with_operands(iseq, iobj, BIN(opt_hash_freeze), 2, hash, (VALUE)ci);
+                ELEM_REMOVE(next);
+            }
+        }
+    }
+
+    /*
+     * newarray 0
+     * send     <calldata!mid:freeze, argc:0, ARGS_SIMPLE>, nil
+     * =>
+     * opt_ary_freeze [], <calldata!mid:freeze, argc:0, ARGS_SIMPLE>
+     */
+    if (IS_INSN_ID(iobj, newarray) && iobj->operands[0] == INT2FIX(0)) {
+        LINK_ELEMENT *next = iobj->link.next;
+        if (IS_INSN(next) && (IS_INSN_ID(next, send))) {
+            const struct rb_callinfo *ci = (struct rb_callinfo *)OPERAND_AT(next, 0);
+            const rb_iseq_t *blockiseq = (rb_iseq_t *)OPERAND_AT(next, 1);
+
+            if (vm_ci_simple(ci) && vm_ci_argc(ci) == 0 && blockiseq == NULL && vm_ci_mid(ci) == idFreeze) {
+                insn_replace_with_operands(iseq, iobj, BIN(opt_ary_freeze), 2, rb_cArray_empty_frozen, (VALUE)ci);
+                ELEM_REMOVE(next);
+            }
+        }
+    }
+
+    /*
+     * newhash 0
+     * send     <calldata!mid:freeze, argc:0, ARGS_SIMPLE>, nil
+     * =>
+     * opt_hash_freeze {}, <calldata!mid:freeze, argc:0, ARGS_SIMPLE>
+     */
+    if (IS_INSN_ID(iobj, newhash) && iobj->operands[0] == INT2FIX(0)) {
+        LINK_ELEMENT *next = iobj->link.next;
+        if (IS_INSN(next) && (IS_INSN_ID(next, send))) {
+            const struct rb_callinfo *ci = (struct rb_callinfo *)OPERAND_AT(next, 0);
+            const rb_iseq_t *blockiseq = (rb_iseq_t *)OPERAND_AT(next, 1);
+
+            if (vm_ci_simple(ci) && vm_ci_argc(ci) == 0 && blockiseq == NULL && vm_ci_mid(ci) == idFreeze) {
+                insn_replace_with_operands(iseq, iobj, BIN(opt_hash_freeze), 2, rb_cHash_empty_frozen, (VALUE)ci);
+                ELEM_REMOVE(next);
+            }
+        }
+    }
+
     if (IS_INSN_ID(iobj, branchif) ||
-	IS_INSN_ID(iobj, branchnil) ||
-	IS_INSN_ID(iobj, branchunless)) {
-	/*
-	 *   if L1
-	 *   ...
-	 * L1:
-	 *   jump L2
-	 * =>
-	 *   if L2
-	 */
-	INSN *nobj = (INSN *)get_destination_insn(iobj);
+        IS_INSN_ID(iobj, branchnil) ||
+        IS_INSN_ID(iobj, branchunless)) {
+        /*
+         *   if L1
+         *   ...
+         * L1:
+         *   jump L2
+         * =>
+         *   if L2
+         */
+        INSN *nobj = (INSN *)get_destination_insn(iobj);
 
         /* This is super nasty hack!!!
          *
@@ -3101,10 +3638,10 @@ iseq_peephole_optimize(rb_iseq_t *iseq, LINK_ELEMENT *list, const int do_tailcal
          * This should be fixed in future.
          */
         int stop_optimization =
-	    ISEQ_COVERAGE(iseq) && ISEQ_LINE_COVERAGE(iseq) &&
+            ISEQ_COVERAGE(iseq) && ISEQ_LINE_COVERAGE(iseq) &&
             nobj->link.type == ISEQ_ELEMENT_INSN &&
             nobj->insn_info.events;
-	if (!stop_optimization) {
+        if (!stop_optimization) {
             INSN *pobj = (INSN *)iobj->link.prev;
             int prev_dup = 0;
             if (pobj) {
@@ -3116,7 +3653,7 @@ iseq_peephole_optimize(rb_iseq_t *iseq, LINK_ELEMENT *list, const int do_tailcal
 
             for (;;) {
                 if (IS_INSN(&nobj->link) && IS_INSN_ID(nobj, jump)) {
-                    replace_destination(iobj, nobj);
+                    if (!replace_destination(iobj, nobj)) break;
                 }
                 else if (prev_dup && IS_INSN_ID(nobj, dup) &&
                          !!(nobj = (INSN *)nobj->link.next) &&
@@ -3137,7 +3674,7 @@ iseq_peephole_optimize(rb_iseq_t *iseq, LINK_ELEMENT *list, const int do_tailcal
                      *   dup
                      *   if L2
                      */
-                    replace_destination(iobj, nobj);
+                    if (!replace_destination(iobj, nobj)) break;
                 }
                 else if (pobj) {
                     /*
@@ -3188,14 +3725,12 @@ iseq_peephole_optimize(rb_iseq_t *iseq, LINK_ELEMENT *list, const int do_tailcal
                         ELEM_REMOVE(iobj->link.prev);
                     }
                     else if (!iseq_pop_newarray(iseq, pobj)) {
-                        NODE dummy_line_node = generate_dummy_line_node(pobj->insn_info.line_no, pobj->insn_info.node_id);
-                        pobj = new_insn_core(iseq, &dummy_line_node, BIN(pop), 0, NULL);
+                        pobj = new_insn_core(iseq, pobj->insn_info.line_no, pobj->insn_info.node_id, BIN(pop), 0, NULL);
                         ELEM_INSERT_PREV(&iobj->link, &pobj->link);
                     }
                     if (cond) {
                         if (prev_dup) {
-                            NODE dummy_line_node = generate_dummy_line_node(pobj->insn_info.line_no, pobj->insn_info.node_id);
-                            pobj = new_insn_core(iseq, &dummy_line_node, BIN(putnil), 0, NULL);
+                            pobj = new_insn_core(iseq, pobj->insn_info.line_no, pobj->insn_info.node_id, BIN(putnil), 0, NULL);
                             ELEM_INSERT_NEXT(&iobj->link, &pobj->link);
                         }
                         iobj->insn_id = BIN(jump);
@@ -3214,235 +3749,440 @@ iseq_peephole_optimize(rb_iseq_t *iseq, LINK_ELEMENT *list, const int do_tailcal
     }
 
     if (IS_INSN_ID(iobj, pop)) {
-	/*
-	 *  putself / putnil / putobject obj / putstring "..."
-	 *  pop
-	 * =>
-	 *  # do nothing
-	 */
-	LINK_ELEMENT *prev = iobj->link.prev;
-	if (IS_INSN(prev)) {
-	    enum ruby_vminsn_type previ = ((INSN *)prev)->insn_id;
-	    if (previ == BIN(putobject) || previ == BIN(putnil) ||
-		previ == BIN(putself) || previ == BIN(putstring) ||
-		previ == BIN(dup) ||
-		previ == BIN(getlocal) ||
-		previ == BIN(getblockparam) ||
-		previ == BIN(getblockparamproxy) ||
-		/* getinstancevariable may issue a warning */
-		previ == BIN(duparray)) {
-		/* just push operand or static value and pop soon, no
-		 * side effects */
-		ELEM_REMOVE(prev);
-		ELEM_REMOVE(&iobj->link);
-	    }
-	    else if (previ == BIN(newarray) && iseq_pop_newarray(iseq, (INSN*)prev)) {
-		ELEM_REMOVE(&iobj->link);
-	    }
-	    else if (previ == BIN(concatarray)) {
-		INSN *piobj = (INSN *)prev;
-                NODE dummy_line_node = generate_dummy_line_node(piobj->insn_info.line_no, piobj->insn_info.node_id);
-		INSERT_BEFORE_INSN1(piobj, &dummy_line_node, splatarray, Qfalse);
-		INSN_OF(piobj) = BIN(pop);
-	    }
-	    else if (previ == BIN(concatstrings)) {
-		if (OPERAND_AT(prev, 0) == INT2FIX(1)) {
-		    ELEM_REMOVE(prev);
-		}
-		else {
-		    ELEM_REMOVE(&iobj->link);
-		    INSN_OF(prev) = BIN(adjuststack);
-		}
-	    }
-	}
+        /*
+         *  putself / putnil / putobject obj / putstring "..."
+         *  pop
+         * =>
+         *  # do nothing
+         */
+        LINK_ELEMENT *prev = iobj->link.prev;
+        if (IS_INSN(prev)) {
+            enum ruby_vminsn_type previ = ((INSN *)prev)->insn_id;
+            if (previ == BIN(putobject) || previ == BIN(putnil) ||
+                previ == BIN(putself) || previ == BIN(putstring) ||
+                previ == BIN(putchilledstring) ||
+                previ == BIN(dup) ||
+                previ == BIN(getlocal) ||
+                previ == BIN(getblockparam) ||
+                previ == BIN(getblockparamproxy) ||
+                previ == BIN(getinstancevariable) ||
+                previ == BIN(duparray)) {
+                /* just push operand or static value and pop soon, no
+                 * side effects */
+                ELEM_REMOVE(prev);
+                ELEM_REMOVE(&iobj->link);
+            }
+            else if (previ == BIN(newarray) && iseq_pop_newarray(iseq, (INSN*)prev)) {
+                ELEM_REMOVE(&iobj->link);
+            }
+            else if (previ == BIN(concatarray)) {
+                INSN *piobj = (INSN *)prev;
+                INSERT_BEFORE_INSN1(piobj, piobj->insn_info.line_no, piobj->insn_info.node_id, splatarray, Qfalse);
+                INSN_OF(piobj) = BIN(pop);
+            }
+            else if (previ == BIN(concatstrings)) {
+                if (OPERAND_AT(prev, 0) == INT2FIX(1)) {
+                    ELEM_REMOVE(prev);
+                }
+                else {
+                    ELEM_REMOVE(&iobj->link);
+                    INSN_OF(prev) = BIN(adjuststack);
+                }
+            }
+        }
     }
 
     if (IS_INSN_ID(iobj, newarray) ||
-	IS_INSN_ID(iobj, duparray) ||
-	IS_INSN_ID(iobj, expandarray) ||
-	IS_INSN_ID(iobj, concatarray) ||
-	IS_INSN_ID(iobj, splatarray) ||
-	0) {
-	/*
-	 *  newarray N
-	 *  splatarray
-	 * =>
-	 *  newarray N
-	 * newarray always puts an array
-	 */
-	LINK_ELEMENT *next = iobj->link.next;
-	if (IS_INSN(next) && IS_INSN_ID(next, splatarray)) {
-	    /* remove splatarray following always-array insn */
-	    ELEM_REMOVE(next);
-	}
+        IS_INSN_ID(iobj, duparray) ||
+        IS_INSN_ID(iobj, concatarray) ||
+        IS_INSN_ID(iobj, splatarray) ||
+        0) {
+        /*
+         *  newarray N
+         *  splatarray
+         * =>
+         *  newarray N
+         * newarray always puts an array
+         */
+        LINK_ELEMENT *next = iobj->link.next;
+        if (IS_INSN(next) && IS_INSN_ID(next, splatarray)) {
+            /* remove splatarray following always-array insn */
+            ELEM_REMOVE(next);
+        }
+    }
+
+    if (IS_INSN_ID(iobj, newarray)) {
+        LINK_ELEMENT *next = iobj->link.next;
+        if (IS_INSN(next) && IS_INSN_ID(next, expandarray) &&
+            OPERAND_AT(next, 1) == INT2FIX(0)) {
+            VALUE op1, op2;
+            op1 = OPERAND_AT(iobj, 0);
+            op2 = OPERAND_AT(next, 0);
+            ELEM_REMOVE(next);
+
+            if (op1 == op2) {
+                /*
+                 *  newarray 2
+                 *  expandarray 2, 0
+                 * =>
+                 *  swap
+                 */
+                if (op1 == INT2FIX(2)) {
+                    INSN_OF(iobj) = BIN(swap);
+                    iobj->operand_size = 0;
+                }
+                /*
+                 *  newarray X
+                 *  expandarray X, 0
+                 * =>
+                 *  opt_reverse X
+                 */
+                else {
+                    INSN_OF(iobj) = BIN(opt_reverse);
+                }
+            }
+            else {
+                long diff = FIX2LONG(op1) - FIX2LONG(op2);
+                INSN_OF(iobj) = BIN(opt_reverse);
+                OPERAND_AT(iobj, 0) = OPERAND_AT(next, 0);
+
+                if (op1 > op2) {
+                    /* X > Y
+                     *  newarray X
+                     *  expandarray Y, 0
+                     * =>
+                     *  pop * (Y-X)
+                     *  opt_reverse Y
+                     */
+                    for (; diff > 0; diff--) {
+                        INSERT_BEFORE_INSN(iobj, iobj->insn_info.line_no, iobj->insn_info.node_id, pop);
+                    }
+                }
+                else { /* (op1 < op2) */
+                    /* X < Y
+                     *  newarray X
+                     *  expandarray Y, 0
+                     * =>
+                     *  putnil * (Y-X)
+                     *  opt_reverse Y
+                     */
+                    for (; diff < 0; diff++) {
+                        INSERT_BEFORE_INSN(iobj, iobj->insn_info.line_no, iobj->insn_info.node_id, putnil);
+                    }
+                }
+            }
+        }
+    }
+
+    if (IS_INSN_ID(iobj, duparray)) {
+        LINK_ELEMENT *next = iobj->link.next;
+        /*
+         *  duparray obj
+         *  expandarray X, 0
+         * =>
+         *  putobject obj
+         *  expandarray X, 0
+         */
+        if (IS_INSN(next) && IS_INSN_ID(next, expandarray)) {
+            INSN_OF(iobj) = BIN(putobject);
+        }
     }
 
     if (IS_INSN_ID(iobj, anytostring)) {
-	LINK_ELEMENT *next = iobj->link.next;
-	/*
+        LINK_ELEMENT *next = iobj->link.next;
+        /*
          *  anytostring
-	 *  concatstrings 1
-	 * =>
+         *  concatstrings 1
+         * =>
          *  anytostring
-	 */
-	if (IS_INSN(next) && IS_INSN_ID(next, concatstrings) &&
-	    OPERAND_AT(next, 0) == INT2FIX(1)) {
-	    ELEM_REMOVE(next);
-	}
-    }
-
-    if (IS_INSN_ID(iobj, putstring) ||
-	(IS_INSN_ID(iobj, putobject) && RB_TYPE_P(OPERAND_AT(iobj, 0), T_STRING))) {
-	/*
-	 *  putstring ""
-	 *  concatstrings N
-	 * =>
-	 *  concatstrings N-1
-	 */
-	if (IS_NEXT_INSN_ID(&iobj->link, concatstrings) &&
-	    RSTRING_LEN(OPERAND_AT(iobj, 0)) == 0) {
-	    INSN *next = (INSN *)iobj->link.next;
-	    if ((OPERAND_AT(next, 0) = FIXNUM_INC(OPERAND_AT(next, 0), -1)) == INT2FIX(1)) {
-		ELEM_REMOVE(&next->link);
-	    }
-	    ELEM_REMOVE(&iobj->link);
-	}
+         */
+        if (IS_INSN(next) && IS_INSN_ID(next, concatstrings) &&
+            OPERAND_AT(next, 0) == INT2FIX(1)) {
+            ELEM_REMOVE(next);
+        }
+    }
+
+    if (IS_INSN_ID(iobj, putstring) || IS_INSN_ID(iobj, putchilledstring) ||
+        (IS_INSN_ID(iobj, putobject) && RB_TYPE_P(OPERAND_AT(iobj, 0), T_STRING))) {
+        /*
+         *  putstring ""
+         *  concatstrings N
+         * =>
+         *  concatstrings N-1
+         */
+        if (IS_NEXT_INSN_ID(&iobj->link, concatstrings) &&
+            RSTRING_LEN(OPERAND_AT(iobj, 0)) == 0) {
+            INSN *next = (INSN *)iobj->link.next;
+            if ((OPERAND_AT(next, 0) = FIXNUM_INC(OPERAND_AT(next, 0), -1)) == INT2FIX(1)) {
+                ELEM_REMOVE(&next->link);
+            }
+            ELEM_REMOVE(&iobj->link);
+        }
+        if (IS_NEXT_INSN_ID(&iobj->link, toregexp)) {
+            INSN *next = (INSN *)iobj->link.next;
+            if (OPERAND_AT(next, 1) == INT2FIX(1)) {
+                VALUE src = OPERAND_AT(iobj, 0);
+                int opt = (int)FIX2LONG(OPERAND_AT(next, 0));
+                VALUE path = rb_iseq_path(iseq);
+                int line = iobj->insn_info.line_no;
+                VALUE errinfo = rb_errinfo();
+                VALUE re = rb_reg_compile(src, opt, RSTRING_PTR(path), line);
+                if (NIL_P(re)) {
+                    VALUE message = rb_attr_get(rb_errinfo(), idMesg);
+                    rb_set_errinfo(errinfo);
+                    COMPILE_ERROR(iseq, line, "%" PRIsVALUE, message);
+                }
+                else {
+                    RB_OBJ_SET_SHAREABLE(re);
+                }
+                RB_OBJ_WRITE(iseq, &OPERAND_AT(iobj, 0), re);
+                ELEM_REMOVE(iobj->link.next);
+            }
+        }
     }
 
     if (IS_INSN_ID(iobj, concatstrings)) {
-	/*
-	 *  concatstrings N
-	 *  concatstrings M
-	 * =>
-	 *  concatstrings N+M-1
-	 */
-	LINK_ELEMENT *next = iobj->link.next;
-	INSN *jump = 0;
-	if (IS_INSN(next) && IS_INSN_ID(next, jump))
-	    next = get_destination_insn(jump = (INSN *)next);
-	if (IS_INSN(next) && IS_INSN_ID(next, concatstrings)) {
-	    int n = FIX2INT(OPERAND_AT(iobj, 0)) + FIX2INT(OPERAND_AT(next, 0)) - 1;
-	    OPERAND_AT(iobj, 0) = INT2FIX(n);
-	    if (jump) {
-		LABEL *label = ((LABEL *)OPERAND_AT(jump, 0));
-		if (!--label->refcnt) {
-		    ELEM_REMOVE(&label->link);
-		}
-		else {
-		    label = NEW_LABEL(0);
-		    OPERAND_AT(jump, 0) = (VALUE)label;
-		}
-		label->refcnt++;
-		ELEM_INSERT_NEXT(next, &label->link);
-		CHECK(iseq_peephole_optimize(iseq, get_next_insn(jump), do_tailcallopt));
-	    }
-	    else {
-		ELEM_REMOVE(next);
-	    }
-	}
+        /*
+         *  concatstrings N
+         *  concatstrings M
+         * =>
+         *  concatstrings N+M-1
+         */
+        LINK_ELEMENT *next = iobj->link.next;
+        INSN *jump = 0;
+        if (IS_INSN(next) && IS_INSN_ID(next, jump))
+            next = get_destination_insn(jump = (INSN *)next);
+        if (IS_INSN(next) && IS_INSN_ID(next, concatstrings)) {
+            int n = FIX2INT(OPERAND_AT(iobj, 0)) + FIX2INT(OPERAND_AT(next, 0)) - 1;
+            OPERAND_AT(iobj, 0) = INT2FIX(n);
+            if (jump) {
+                LABEL *label = ((LABEL *)OPERAND_AT(jump, 0));
+                if (!--label->refcnt) {
+                    ELEM_REMOVE(&label->link);
+                }
+                else {
+                    label = NEW_LABEL(0);
+                    OPERAND_AT(jump, 0) = (VALUE)label;
+                }
+                label->refcnt++;
+                ELEM_INSERT_NEXT(next, &label->link);
+                CHECK(iseq_peephole_optimize(iseq, get_next_insn(jump), do_tailcallopt));
+            }
+            else {
+                ELEM_REMOVE(next);
+            }
+        }
     }
 
     if (do_tailcallopt &&
-	(IS_INSN_ID(iobj, send) ||
-	 IS_INSN_ID(iobj, opt_aref_with) ||
-	 IS_INSN_ID(iobj, opt_aset_with) ||
-	 IS_INSN_ID(iobj, invokesuper))) {
-	/*
-	 *  send ...
-	 *  leave
-	 * =>
-	 *  send ..., ... | VM_CALL_TAILCALL, ...
-	 *  leave # unreachable
-	 */
-	INSN *piobj = NULL;
-	if (iobj->link.next) {
-	    LINK_ELEMENT *next = iobj->link.next;
-	    do {
-		if (!IS_INSN(next)) {
-		    next = next->next;
-		    continue;
-		}
-		switch (INSN_OF(next)) {
-		  case BIN(nop):
-		    next = next->next;
-		    break;
-		  case BIN(jump):
-		    /* if cond
-		     *   return tailcall
-		     * end
-		     */
-		    next = get_destination_insn((INSN *)next);
-		    break;
-		  case BIN(leave):
-		    piobj = iobj;
+        (IS_INSN_ID(iobj, send) ||
+         IS_INSN_ID(iobj, invokesuper))) {
+        /*
+         *  send ...
+         *  leave
+         * =>
+         *  send ..., ... | VM_CALL_TAILCALL, ...
+         *  leave # unreachable
+         */
+        INSN *piobj = NULL;
+        if (iobj->link.next) {
+            LINK_ELEMENT *next = iobj->link.next;
+            do {
+                if (!IS_INSN(next)) {
+                    next = next->next;
+                    continue;
+                }
+                switch (INSN_OF(next)) {
+                  case BIN(nop):
+                    next = next->next;
+                    break;
+                  case BIN(jump):
+                    /* if cond
+                     *   return tailcall
+                     * end
+                     */
+                    next = get_destination_insn((INSN *)next);
+                    break;
+                  case BIN(leave):
+                    piobj = iobj;
                     /* fall through */
-		  default:
-		    next = NULL;
-		    break;
-		}
-	    } while (next);
-	}
-
-	if (piobj) {
+                  default:
+                    next = NULL;
+                    break;
+                }
+            } while (next);
+        }
+
+        if (piobj) {
             const struct rb_callinfo *ci = (struct rb_callinfo *)OPERAND_AT(piobj, 0);
-	    if (IS_INSN_ID(piobj, send) ||
+            if (IS_INSN_ID(piobj, send) ||
                 IS_INSN_ID(piobj, invokesuper)) {
                 if (OPERAND_AT(piobj, 1) == 0) { /* no blockiseq */
                     ci = ci_flag_set(iseq, ci, VM_CALL_TAILCALL);
                     OPERAND_AT(piobj, 0) = (VALUE)ci;
                     RB_OBJ_WRITTEN(iseq, Qundef, ci);
-		}
-	    }
-	    else {
+                }
+            }
+            else {
                 ci = ci_flag_set(iseq, ci, VM_CALL_TAILCALL);
                 OPERAND_AT(piobj, 0) = (VALUE)ci;
                 RB_OBJ_WRITTEN(iseq, Qundef, ci);
-	    }
-	}
+            }
+        }
     }
 
     if (IS_INSN_ID(iobj, dup)) {
-	if (IS_NEXT_INSN_ID(&iobj->link, setlocal)) {
-	    LINK_ELEMENT *set1 = iobj->link.next, *set2 = NULL;
-	    if (IS_NEXT_INSN_ID(set1, setlocal)) {
-		set2 = set1->next;
-		if (OPERAND_AT(set1, 0) == OPERAND_AT(set2, 0) &&
-		    OPERAND_AT(set1, 1) == OPERAND_AT(set2, 1)) {
-		    ELEM_REMOVE(set1);
-		    ELEM_REMOVE(&iobj->link);
-		}
-	    }
-	    else if (IS_NEXT_INSN_ID(set1, dup) &&
-		     IS_NEXT_INSN_ID(set1->next, setlocal)) {
-		set2 = set1->next->next;
-		if (OPERAND_AT(set1, 0) == OPERAND_AT(set2, 0) &&
-		    OPERAND_AT(set1, 1) == OPERAND_AT(set2, 1)) {
-		    ELEM_REMOVE(set1->next);
-		    ELEM_REMOVE(set2);
-		}
-	    }
-	}
+        if (IS_NEXT_INSN_ID(&iobj->link, setlocal)) {
+            LINK_ELEMENT *set1 = iobj->link.next, *set2 = NULL;
+
+            /*
+            *  dup
+            *  setlocal x, y
+            *  setlocal x, y
+            * =>
+            *  dup
+            *  setlocal x, y
+            */
+            if (IS_NEXT_INSN_ID(set1, setlocal)) {
+                set2 = set1->next;
+                if (OPERAND_AT(set1, 0) == OPERAND_AT(set2, 0) &&
+                    OPERAND_AT(set1, 1) == OPERAND_AT(set2, 1)) {
+                    ELEM_REMOVE(set1);
+                    ELEM_REMOVE(&iobj->link);
+                }
+            }
+
+            /*
+            *  dup
+            *  setlocal x, y
+            *  dup
+            *  setlocal x, y
+            * =>
+            *  dup
+            *  setlocal x, y
+            */
+            else if (IS_NEXT_INSN_ID(set1, dup) &&
+                     IS_NEXT_INSN_ID(set1->next, setlocal)) {
+                set2 = set1->next->next;
+                if (OPERAND_AT(set1, 0) == OPERAND_AT(set2, 0) &&
+                    OPERAND_AT(set1, 1) == OPERAND_AT(set2, 1)) {
+                    ELEM_REMOVE(set1->next);
+                    ELEM_REMOVE(set2);
+                }
+            }
+        }
     }
 
+    /*
+    *  getlocal x, y
+    *  dup
+    *  setlocal x, y
+    * =>
+    *  dup
+    */
     if (IS_INSN_ID(iobj, getlocal)) {
-	LINK_ELEMENT *niobj = &iobj->link;
-	if (IS_NEXT_INSN_ID(niobj, dup)) {
-	    niobj = niobj->next;
-	}
-	if (IS_NEXT_INSN_ID(niobj, setlocal)) {
-	    LINK_ELEMENT *set1 = niobj->next;
-	    if (OPERAND_AT(iobj, 0) == OPERAND_AT(set1, 0) &&
-		OPERAND_AT(iobj, 1) == OPERAND_AT(set1, 1)) {
-		ELEM_REMOVE(set1);
-		ELEM_REMOVE(niobj);
-	    }
-	}
+        LINK_ELEMENT *niobj = &iobj->link;
+        if (IS_NEXT_INSN_ID(niobj, dup)) {
+            niobj = niobj->next;
+        }
+        if (IS_NEXT_INSN_ID(niobj, setlocal)) {
+            LINK_ELEMENT *set1 = niobj->next;
+            if (OPERAND_AT(iobj, 0) == OPERAND_AT(set1, 0) &&
+                OPERAND_AT(iobj, 1) == OPERAND_AT(set1, 1)) {
+                ELEM_REMOVE(set1);
+                ELEM_REMOVE(niobj);
+            }
+        }
     }
 
+    /*
+    *  opt_invokebuiltin_delegate
+    *  trace
+    *  leave
+    * =>
+    *  opt_invokebuiltin_delegate_leave
+    *  trace
+    *  leave
+    */
     if (IS_INSN_ID(iobj, opt_invokebuiltin_delegate)) {
         if (IS_TRACE(iobj->link.next)) {
             if (IS_NEXT_INSN_ID(iobj->link.next, leave)) {
                 iobj->insn_id = BIN(opt_invokebuiltin_delegate_leave);
+                const struct rb_builtin_function *bf = (const struct rb_builtin_function *)iobj->operands[0];
+                if (iobj == (INSN *)list && bf->argc == 0 && (ISEQ_BODY(iseq)->builtin_attrs & BUILTIN_ATTR_LEAF)) {
+                    ISEQ_BODY(iseq)->builtin_attrs |= BUILTIN_ATTR_SINGLE_NOARG_LEAF;
+                }
+            }
+        }
+    }
+
+    /*
+    *  getblockparam
+    *  branchif / branchunless
+    * =>
+    *  getblockparamproxy
+    *  branchif / branchunless
+    */
+    if (IS_INSN_ID(iobj, getblockparam)) {
+        if (IS_NEXT_INSN_ID(&iobj->link, branchif) || IS_NEXT_INSN_ID(&iobj->link, branchunless)) {
+            iobj->insn_id = BIN(getblockparamproxy);
+        }
+    }
+
+    if (IS_INSN_ID(iobj, splatarray) && OPERAND_AT(iobj, 0) == false) {
+        LINK_ELEMENT *niobj = &iobj->link;
+        if (IS_NEXT_INSN_ID(niobj, duphash)) {
+            niobj = niobj->next;
+            LINK_ELEMENT *siobj;
+            unsigned int set_flags = 0, unset_flags = 0;
+
+            /*
+            * Eliminate hash allocation for f(*a, kw: 1)
+            *
+            *  splatarray false
+            *  duphash
+            *  send ARGS_SPLAT|KW_SPLAT|KW_SPLAT_MUT and not ARGS_BLOCKARG
+            * =>
+            *  splatarray false
+            *  putobject
+            *  send ARGS_SPLAT|KW_SPLAT
+            */
+            if (IS_NEXT_INSN_ID(niobj, send)) {
+                siobj = niobj->next;
+                set_flags = VM_CALL_ARGS_SPLAT|VM_CALL_KW_SPLAT|VM_CALL_KW_SPLAT_MUT;
+                unset_flags = VM_CALL_ARGS_BLOCKARG;
+            }
+            /*
+            * Eliminate hash allocation for f(*a, kw: 1, &{arg,lvar,@iv})
+            *
+            *  splatarray false
+            *  duphash
+            *  getlocal / getinstancevariable / getblockparamproxy
+            *  send ARGS_SPLAT|KW_SPLAT|KW_SPLAT_MUT|ARGS_BLOCKARG
+            * =>
+            *  splatarray false
+            *  putobject
+            *  getlocal / getinstancevariable / getblockparamproxy
+            *  send ARGS_SPLAT|KW_SPLAT|ARGS_BLOCKARG
+            */
+            else if ((IS_NEXT_INSN_ID(niobj, getlocal) || IS_NEXT_INSN_ID(niobj, getinstancevariable) ||
+                        IS_NEXT_INSN_ID(niobj, getblockparamproxy)) && (IS_NEXT_INSN_ID(niobj->next, send))) {
+                siobj = niobj->next->next;
+                set_flags = VM_CALL_ARGS_SPLAT|VM_CALL_KW_SPLAT|VM_CALL_KW_SPLAT_MUT|VM_CALL_ARGS_BLOCKARG;
+            }
+
+            if (set_flags) {
+                const struct rb_callinfo *ci = (const struct rb_callinfo *)OPERAND_AT(siobj, 0);
+                unsigned int flags = vm_ci_flag(ci);
+                if ((flags & set_flags) == set_flags && !(flags & unset_flags)) {
+                    ((INSN*)niobj)->insn_id = BIN(putobject);
+                    RB_OBJ_WRITE(iseq, &OPERAND_AT(niobj, 0), RB_OBJ_SET_SHAREABLE(rb_hash_freeze(rb_hash_resurrect(OPERAND_AT(niobj, 0)))));
+
+                    const struct rb_callinfo *nci = vm_ci_new(vm_ci_mid(ci),
+                        flags & ~VM_CALL_KW_SPLAT_MUT, vm_ci_argc(ci), vm_ci_kwarg(ci));
+                    RB_OBJ_WRITTEN(iseq, ci, nci);
+                    OPERAND_AT(siobj, 0) = (VALUE)nci;
+                }
             }
         }
     }
@@ -3453,17 +4193,16 @@ iseq_peephole_optimize(rb_iseq_t *iseq, LINK_ELEMENT *list, const int do_tailcal
 static int
 insn_set_specialized_instruction(rb_iseq_t *iseq, INSN *iobj, int insn_id)
 {
-    iobj->insn_id = insn_id;
-    iobj->operand_size = insn_len(insn_id) - 1;
-    iobj->insn_info.events |= RUBY_EVENT_C_CALL | RUBY_EVENT_C_RETURN;
-
     if (insn_id == BIN(opt_neq)) {
         VALUE original_ci = iobj->operands[0];
-        iobj->operand_size = 2;
-        iobj->operands = compile_data_calloc2(iseq, iobj->operand_size, sizeof(VALUE));
-        iobj->operands[0] = (VALUE)new_callinfo(iseq, idEq, 1, 0, NULL, FALSE);
-        iobj->operands[1] = original_ci;
+        VALUE new_ci = (VALUE)new_callinfo(iseq, idEq, 1, 0, NULL, FALSE);
+        insn_replace_with_operands(iseq, iobj, insn_id, 2, new_ci, original_ci);
+    }
+    else {
+        iobj->insn_id = insn_id;
+        iobj->operand_size = insn_len(insn_id) - 1;
     }
+    iobj->insn_info.events |= RUBY_EVENT_C_CALL | RUBY_EVENT_C_RETURN;
 
     return COMPILE_OK;
 }
@@ -3472,77 +4211,190 @@ static int
 iseq_specialized_instruction(rb_iseq_t *iseq, INSN *iobj)
 {
     if (IS_INSN_ID(iobj, newarray) && iobj->link.next &&
-	IS_INSN(iobj->link.next)) {
-	/*
-	 *   [a, b, ...].max/min -> a, b, c, opt_newarray_max/min
-	 */
-	INSN *niobj = (INSN *)iobj->link.next;
-	if (IS_INSN_ID(niobj, send)) {
+        IS_INSN(iobj->link.next)) {
+        /*
+         *   [a, b, ...].max/min -> a, b, c, opt_newarray_send max/min
+         */
+        INSN *niobj = (INSN *)iobj->link.next;
+        if (IS_INSN_ID(niobj, send)) {
             const struct rb_callinfo *ci = (struct rb_callinfo *)OPERAND_AT(niobj, 0);
-            if ((vm_ci_flag(ci) & VM_CALL_ARGS_SIMPLE) && vm_ci_argc(ci) == 0) {
-		switch (vm_ci_mid(ci)) {
-		  case idMax:
-		    iobj->insn_id = BIN(opt_newarray_max);
-		    ELEM_REMOVE(&niobj->link);
-		    return COMPILE_OK;
-		  case idMin:
-		    iobj->insn_id = BIN(opt_newarray_min);
-		    ELEM_REMOVE(&niobj->link);
-		    return COMPILE_OK;
-		}
-	    }
-	}
+            if (vm_ci_simple(ci) && vm_ci_argc(ci) == 0) {
+                VALUE method = INT2FIX(0);
+                switch (vm_ci_mid(ci)) {
+                  case idMax:
+                      method = INT2FIX(VM_OPT_NEWARRAY_SEND_MAX);
+                      break;
+                  case idMin:
+                      method = INT2FIX(VM_OPT_NEWARRAY_SEND_MIN);
+                      break;
+                  case idHash:
+                      method = INT2FIX(VM_OPT_NEWARRAY_SEND_HASH);
+                      break;
+                }
+
+                if (method != INT2FIX(0)) {
+                    VALUE num = iobj->operands[0];
+                    insn_replace_with_operands(iseq, iobj, BIN(opt_newarray_send), 2, num, method);
+                    ELEM_REMOVE(&niobj->link);
+                    return COMPILE_OK;
+                }
+            }
+        }
+        else if ((IS_INSN_ID(niobj, putstring) || IS_INSN_ID(niobj, putchilledstring) ||
+                  (IS_INSN_ID(niobj, putobject) && RB_TYPE_P(OPERAND_AT(niobj, 0), T_STRING))) &&
+                 IS_NEXT_INSN_ID(&niobj->link, send)) {
+            const struct rb_callinfo *ci = (struct rb_callinfo *)OPERAND_AT((INSN *)niobj->link.next, 0);
+            if (vm_ci_simple(ci) && vm_ci_argc(ci) == 1 && vm_ci_mid(ci) == idPack) {
+                VALUE num = iobj->operands[0];
+                insn_replace_with_operands(iseq, iobj, BIN(opt_newarray_send), 2, FIXNUM_INC(num, 1), INT2FIX(VM_OPT_NEWARRAY_SEND_PACK));
+                ELEM_REMOVE(&iobj->link);
+                ELEM_REMOVE(niobj->link.next);
+                ELEM_INSERT_NEXT(&niobj->link, &iobj->link);
+                return COMPILE_OK;
+            }
+        }
+        // newarray n, putchilledstring "E", getlocal b, send :pack with {buffer: b}
+        // -> putchilledstring "E", getlocal b, opt_newarray_send n+2, :pack, :buffer
+        else if ((IS_INSN_ID(niobj, putstring) || IS_INSN_ID(niobj, putchilledstring) ||
+                  (IS_INSN_ID(niobj, putobject) && RB_TYPE_P(OPERAND_AT(niobj, 0), T_STRING))) &&
+                 IS_NEXT_INSN_ID(&niobj->link, getlocal) &&
+                 (niobj->link.next && IS_NEXT_INSN_ID(niobj->link.next, send))) {
+            const struct rb_callinfo *ci = (struct rb_callinfo *)OPERAND_AT((INSN *)(niobj->link.next)->next, 0);
+            const struct rb_callinfo_kwarg *kwarg = vm_ci_kwarg(ci);
+            if (vm_ci_mid(ci) == idPack && vm_ci_argc(ci) == 2 &&
+                    (kwarg && kwarg->keyword_len == 1 && kwarg->keywords[0] == rb_id2sym(idBuffer))) {
+                VALUE num = iobj->operands[0];
+                insn_replace_with_operands(iseq, iobj, BIN(opt_newarray_send), 2, FIXNUM_INC(num, 2), INT2FIX(VM_OPT_NEWARRAY_SEND_PACK_BUFFER));
+                // Remove the "send" insn.
+                ELEM_REMOVE((niobj->link.next)->next);
+                // Remove the modified insn from its original "newarray" position...
+                ELEM_REMOVE(&iobj->link);
+                // and insert it after the buffer insn.
+                ELEM_INSERT_NEXT(niobj->link.next, &iobj->link);
+                return COMPILE_OK;
+            }
+        }
+
+        // Break the "else if" chain since some prior checks abort after sub-ifs.
+        // We already found "newarray".  To match `[...].include?(arg)` we look for
+        // the instruction(s) representing the argument followed by a "send".
+        if ((IS_INSN_ID(niobj, putstring) || IS_INSN_ID(niobj, putchilledstring) ||
+                  IS_INSN_ID(niobj, putobject) ||
+                  IS_INSN_ID(niobj, putself) ||
+                  IS_INSN_ID(niobj, getlocal) ||
+                  IS_INSN_ID(niobj, getinstancevariable)) &&
+                 IS_NEXT_INSN_ID(&niobj->link, send)) {
+
+            LINK_ELEMENT *sendobj = &(niobj->link); // Below we call ->next;
+            const struct rb_callinfo *ci;
+            // Allow any number (0 or more) of simple method calls on the argument
+            // (as in `[...].include?(arg.method1.method2)`.
+            do {
+                sendobj = sendobj->next;
+                ci = (struct rb_callinfo *)OPERAND_AT(sendobj, 0);
+            } while (vm_ci_simple(ci) && vm_ci_argc(ci) == 0 && IS_NEXT_INSN_ID(sendobj, send));
+
+            // If this send is for .include? with one arg we can do our opt.
+            if (vm_ci_simple(ci) && vm_ci_argc(ci) == 1 && vm_ci_mid(ci) == idIncludeP) {
+                VALUE num = iobj->operands[0];
+                INSN *sendins = (INSN *)sendobj;
+                insn_replace_with_operands(iseq, sendins, BIN(opt_newarray_send), 2, FIXNUM_INC(num, 1), INT2FIX(VM_OPT_NEWARRAY_SEND_INCLUDE_P));
+                // Remove the original "newarray" insn.
+                ELEM_REMOVE(&iobj->link);
+                return COMPILE_OK;
+            }
+        }
     }
 
+    /*
+     * duparray [...]
+     * some insn for the arg...
+     * send     <calldata!mid:include?, argc:1, ARGS_SIMPLE>, nil
+     * =>
+     * arg insn...
+     * opt_duparray_send [...], :include?, 1
+     */
+    if (IS_INSN_ID(iobj, duparray) && iobj->link.next && IS_INSN(iobj->link.next)) {
+        INSN *niobj = (INSN *)iobj->link.next;
+        if ((IS_INSN_ID(niobj, getlocal) ||
+             IS_INSN_ID(niobj, getinstancevariable) ||
+             IS_INSN_ID(niobj, putself)) &&
+            IS_NEXT_INSN_ID(&niobj->link, send)) {
+
+            LINK_ELEMENT *sendobj = &(niobj->link); // Below we call ->next;
+            const struct rb_callinfo *ci;
+            // Allow any number (0 or more) of simple method calls on the argument
+            // (as in `[...].include?(arg.method1.method2)`.
+            do {
+                sendobj = sendobj->next;
+                ci = (struct rb_callinfo *)OPERAND_AT(sendobj, 0);
+            } while (vm_ci_simple(ci) && vm_ci_argc(ci) == 0 && IS_NEXT_INSN_ID(sendobj, send));
+
+            if (vm_ci_simple(ci) && vm_ci_argc(ci) == 1 && vm_ci_mid(ci) == idIncludeP) {
+                // Move the array arg from duparray to opt_duparray_send.
+                VALUE ary = iobj->operands[0];
+                rb_obj_reveal(ary, rb_cArray);
+
+                INSN *sendins = (INSN *)sendobj;
+                insn_replace_with_operands(iseq, sendins, BIN(opt_duparray_send), 3, ary, rb_id2sym(idIncludeP), INT2FIX(1));
+
+                // Remove the duparray insn.
+                ELEM_REMOVE(&iobj->link);
+                return COMPILE_OK;
+            }
+        }
+    }
+
+
     if (IS_INSN_ID(iobj, send)) {
         const struct rb_callinfo *ci = (struct rb_callinfo *)OPERAND_AT(iobj, 0);
         const rb_iseq_t *blockiseq = (rb_iseq_t *)OPERAND_AT(iobj, 1);
 
 #define SP_INSN(opt) insn_set_specialized_instruction(iseq, iobj, BIN(opt_##opt))
-	if (vm_ci_flag(ci) & VM_CALL_ARGS_SIMPLE) {
-	    switch (vm_ci_argc(ci)) {
-	      case 0:
-		switch (vm_ci_mid(ci)) {
-		  case idLength: SP_INSN(length); return COMPILE_OK;
-		  case idSize:	 SP_INSN(size);	  return COMPILE_OK;
-		  case idEmptyP: SP_INSN(empty_p);return COMPILE_OK;
+        if (vm_ci_simple(ci)) {
+            switch (vm_ci_argc(ci)) {
+              case 0:
+                switch (vm_ci_mid(ci)) {
+                  case idLength: SP_INSN(length); return COMPILE_OK;
+                  case idSize:	 SP_INSN(size);	  return COMPILE_OK;
+                  case idEmptyP: SP_INSN(empty_p);return COMPILE_OK;
                   case idNilP:   SP_INSN(nil_p);  return COMPILE_OK;
-		  case idSucc:	 SP_INSN(succ);	  return COMPILE_OK;
-		  case idNot:	 SP_INSN(not);	  return COMPILE_OK;
-		}
-		break;
-	      case 1:
-		switch (vm_ci_mid(ci)) {
-		  case idPLUS:	 SP_INSN(plus);	  return COMPILE_OK;
-		  case idMINUS:	 SP_INSN(minus);  return COMPILE_OK;
-		  case idMULT:	 SP_INSN(mult);	  return COMPILE_OK;
-		  case idDIV:	 SP_INSN(div);	  return COMPILE_OK;
-		  case idMOD:	 SP_INSN(mod);	  return COMPILE_OK;
-		  case idEq:	 SP_INSN(eq);	  return COMPILE_OK;
-		  case idNeq:	 SP_INSN(neq);	  return COMPILE_OK;
-		  case idEqTilde:SP_INSN(regexpmatch2);return COMPILE_OK;
-		  case idLT:	 SP_INSN(lt);	  return COMPILE_OK;
-		  case idLE:	 SP_INSN(le);	  return COMPILE_OK;
-		  case idGT:	 SP_INSN(gt);	  return COMPILE_OK;
-		  case idGE:	 SP_INSN(ge);	  return COMPILE_OK;
-		  case idLTLT:	 SP_INSN(ltlt);	  return COMPILE_OK;
-		  case idAREF:	 SP_INSN(aref);	  return COMPILE_OK;
+                  case idSucc:	 SP_INSN(succ);	  return COMPILE_OK;
+                  case idNot:	 SP_INSN(not);	  return COMPILE_OK;
+                }
+                break;
+              case 1:
+                switch (vm_ci_mid(ci)) {
+                  case idPLUS:	 SP_INSN(plus);	  return COMPILE_OK;
+                  case idMINUS:	 SP_INSN(minus);  return COMPILE_OK;
+                  case idMULT:	 SP_INSN(mult);	  return COMPILE_OK;
+                  case idDIV:	 SP_INSN(div);	  return COMPILE_OK;
+                  case idMOD:	 SP_INSN(mod);	  return COMPILE_OK;
+                  case idEq:	 SP_INSN(eq);	  return COMPILE_OK;
+                  case idNeq:	 SP_INSN(neq);	  return COMPILE_OK;
+                  case idEqTilde:SP_INSN(regexpmatch2);return COMPILE_OK;
+                  case idLT:	 SP_INSN(lt);	  return COMPILE_OK;
+                  case idLE:	 SP_INSN(le);	  return COMPILE_OK;
+                  case idGT:	 SP_INSN(gt);	  return COMPILE_OK;
+                  case idGE:	 SP_INSN(ge);	  return COMPILE_OK;
+                  case idLTLT:	 SP_INSN(ltlt);	  return COMPILE_OK;
+                  case idAREF:	 SP_INSN(aref);	  return COMPILE_OK;
                   case idAnd:    SP_INSN(and);    return COMPILE_OK;
                   case idOr:     SP_INSN(or);    return COMPILE_OK;
-		}
-		break;
-	      case 2:
-		switch (vm_ci_mid(ci)) {
-		  case idASET:	 SP_INSN(aset);	  return COMPILE_OK;
-		}
-		break;
-	    }
-	}
-
-	if ((vm_ci_flag(ci) & VM_CALL_ARGS_BLOCKARG) == 0 && blockiseq == NULL) {
-	    iobj->insn_id = BIN(opt_send_without_block);
-	    iobj->operand_size = insn_len(iobj->insn_id) - 1;
-	}
+                }
+                break;
+              case 2:
+                switch (vm_ci_mid(ci)) {
+                  case idASET:	 SP_INSN(aset);	  return COMPILE_OK;
+                }
+                break;
+            }
+        }
+
+        if ((vm_ci_flag(ci) & (VM_CALL_ARGS_BLOCKARG | VM_CALL_FORWARDING)) == 0 && blockiseq == NULL) {
+            iobj->insn_id = BIN(opt_send_without_block);
+            iobj->operand_size = insn_len(iobj->insn_id) - 1;
+        }
     }
 #undef SP_INSN
 
@@ -3556,13 +4408,13 @@ tailcallable_p(rb_iseq_t *iseq)
       case ISEQ_TYPE_TOP:
       case ISEQ_TYPE_EVAL:
       case ISEQ_TYPE_MAIN:
-	/* not tail callable because cfp will be over popped */
+        /* not tail callable because cfp will be over popped */
       case ISEQ_TYPE_RESCUE:
       case ISEQ_TYPE_ENSURE:
-	/* rescue block can't tail call because of errinfo */
-	return FALSE;
+        /* rescue block can't tail call because of errinfo */
+        return FALSE;
       default:
-	return TRUE;
+        return TRUE;
     }
 }
 
@@ -3572,7 +4424,7 @@ iseq_optimize(rb_iseq_t *iseq, LINK_ANCHOR *const anchor)
     LINK_ELEMENT *list;
     const int do_peepholeopt = ISEQ_COMPILE_DATA(iseq)->option->peephole_optimization;
     const int do_tailcallopt = tailcallable_p(iseq) &&
-	ISEQ_COMPILE_DATA(iseq)->option->tailcall_optimization;
+        ISEQ_COMPILE_DATA(iseq)->option->tailcall_optimization;
     const int do_si = ISEQ_COMPILE_DATA(iseq)->option->specialized_instruction;
     const int do_ou = ISEQ_COMPILE_DATA(iseq)->option->operands_unification;
     int rescue_level = 0;
@@ -3581,42 +4433,69 @@ iseq_optimize(rb_iseq_t *iseq, LINK_ANCHOR *const anchor)
     list = FIRST_ELEMENT(anchor);
 
     int do_block_optimization = 0;
+    LABEL * block_loop_label = NULL;
 
-    if (ISEQ_BODY(iseq)->type == ISEQ_TYPE_BLOCK && !ISEQ_BODY(iseq)->catch_except_p) {
+    // If we're optimizing a block
+    if (ISEQ_BODY(iseq)->type == ISEQ_TYPE_BLOCK) {
         do_block_optimization = 1;
+
+        // If the block starts with a nop and a label,
+        // record the label so we can detect if it's a jump target
+        LINK_ELEMENT * le = FIRST_ELEMENT(anchor)->next;
+        if (IS_INSN(le) && IS_INSN_ID((INSN *)le, nop) && IS_LABEL(le->next)) {
+            block_loop_label = (LABEL *)le->next;
+        }
     }
 
     while (list) {
-	if (IS_INSN(list)) {
-	    if (do_peepholeopt) {
-		iseq_peephole_optimize(iseq, list, tailcallopt);
-	    }
-	    if (do_si) {
-		iseq_specialized_instruction(iseq, (INSN *)list);
-	    }
-	    if (do_ou) {
-		insn_operands_unification((INSN *)list);
-	    }
+        if (IS_INSN(list)) {
+            if (do_peepholeopt) {
+                iseq_peephole_optimize(iseq, list, tailcallopt);
+            }
+            if (do_si) {
+                iseq_specialized_instruction(iseq, (INSN *)list);
+            }
+            if (do_ou) {
+                insn_operands_unification((INSN *)list);
+            }
 
             if (do_block_optimization) {
                 INSN * item = (INSN *)list;
-                if (IS_INSN_ID(item, jump)) {
+                // Give up if there is a throw
+                if (IS_INSN_ID(item, throw)) {
                     do_block_optimization = 0;
                 }
+                else {
+                    // If the instruction has a jump target, check if the
+                    // jump target is the block loop label
+                    const char *types = insn_op_types(item->insn_id);
+                    for (int j = 0; types[j]; j++) {
+                        if (types[j] == TS_OFFSET) {
+                            // If the jump target is equal to the block loop
+                            // label, then we can't do the optimization because
+                            // the leading `nop` instruction fires the block
+                            // entry tracepoint
+                            LABEL * target = (LABEL *)OPERAND_AT(item, j);
+                            if (target == block_loop_label) {
+                                do_block_optimization = 0;
+                            }
+                        }
+                    }
+                }
+            }
+        }
+        if (IS_LABEL(list)) {
+            switch (((LABEL *)list)->rescued) {
+              case LABEL_RESCUE_BEG:
+                rescue_level++;
+                tailcallopt = FALSE;
+                break;
+              case LABEL_RESCUE_END:
+                if (!--rescue_level) tailcallopt = do_tailcallopt;
+                break;
             }
-	}
-	if (IS_LABEL(list)) {
-	    switch (((LABEL *)list)->rescued) {
-	      case LABEL_RESCUE_BEG:
-		rescue_level++;
-		tailcallopt = FALSE;
-		break;
-	      case LABEL_RESCUE_END:
-		if (!--rescue_level) tailcallopt = do_tailcallopt;
-		break;
-	    }
-	}
-	list = list->next;
+        }
+        list = list->next;
     }
 
     if (do_block_optimization) {
@@ -3631,7 +4510,7 @@ iseq_optimize(rb_iseq_t *iseq, LINK_ANCHOR *const anchor)
 #if OPT_INSTRUCTIONS_UNIFICATION
 static INSN *
 new_unified_insn(rb_iseq_t *iseq,
-		 int insn_id, int size, LINK_ELEMENT *seq_list)
+                 int insn_id, int size, LINK_ELEMENT *seq_list)
 {
     INSN *iobj = 0;
     LINK_ELEMENT *list = seq_list;
@@ -3641,26 +4520,25 @@ new_unified_insn(rb_iseq_t *iseq,
 
     /* count argc */
     for (i = 0; i < size; i++) {
-	iobj = (INSN *)list;
-	argc += iobj->operand_size;
-	list = list->next;
+        iobj = (INSN *)list;
+        argc += iobj->operand_size;
+        list = list->next;
     }
 
     if (argc > 0) {
-	ptr = operands = compile_data_alloc2(iseq, sizeof(VALUE), argc);
+        ptr = operands = compile_data_alloc2(iseq, sizeof(VALUE), argc);
     }
 
     /* copy operands */
     list = seq_list;
     for (i = 0; i < size; i++) {
-	iobj = (INSN *)list;
-	MEMCPY(ptr, iobj->operands, VALUE, iobj->operand_size);
-	ptr += iobj->operand_size;
-	list = list->next;
+        iobj = (INSN *)list;
+        MEMCPY(ptr, iobj->operands, VALUE, iobj->operand_size);
+        ptr += iobj->operand_size;
+        list = list->next;
     }
 
-    NODE dummy_line_node = generate_dummy_line_node(iobj->insn_info.line_no, iobj->insn_info.node_id);
-    return new_insn_core(iseq, &dummy_line_node, insn_id, argc, operands);
+    return new_insn_core(iseq, iobj->insn_info.line_no, iobj->insn_info.node_id, insn_id, argc, operands);
 }
 #endif
 
@@ -3680,271 +4558,154 @@ iseq_insns_unification(rb_iseq_t *iseq, LINK_ANCHOR *const anchor)
 
     list = FIRST_ELEMENT(anchor);
     while (list) {
-	if (IS_INSN(list)) {
-	    iobj = (INSN *)list;
-	    id = iobj->insn_id;
-	    if (unified_insns_data[id] != 0) {
-		const int *const *entry = unified_insns_data[id];
-		for (j = 1; j < (intptr_t)entry[0]; j++) {
-		    const int *unified = entry[j];
-		    LINK_ELEMENT *li = list->next;
-		    for (k = 2; k < unified[1]; k++) {
-			if (!IS_INSN(li) ||
-			    ((INSN *)li)->insn_id != unified[k]) {
-			    goto miss;
-			}
-			li = li->next;
-		    }
-		    /* matched */
-		    niobj =
-			new_unified_insn(iseq, unified[0], unified[1] - 1,
-					 list);
-
-		    /* insert to list */
-		    niobj->link.prev = (LINK_ELEMENT *)iobj->link.prev;
-		    niobj->link.next = li;
-		    if (li) {
-			li->prev = (LINK_ELEMENT *)niobj;
-		    }
-
-		    list->prev->next = (LINK_ELEMENT *)niobj;
-		    list = (LINK_ELEMENT *)niobj;
-		    break;
-		  miss:;
-		}
-	    }
-	}
-	list = list->next;
+        if (IS_INSN(list)) {
+            iobj = (INSN *)list;
+            id = iobj->insn_id;
+            if (unified_insns_data[id] != 0) {
+                const int *const *entry = unified_insns_data[id];
+                for (j = 1; j < (intptr_t)entry[0]; j++) {
+                    const int *unified = entry[j];
+                    LINK_ELEMENT *li = list->next;
+                    for (k = 2; k < unified[1]; k++) {
+                        if (!IS_INSN(li) ||
+                            ((INSN *)li)->insn_id != unified[k]) {
+                            goto miss;
+                        }
+                        li = li->next;
+                    }
+                    /* matched */
+                    niobj =
+                        new_unified_insn(iseq, unified[0], unified[1] - 1,
+                                         list);
+
+                    /* insert to list */
+                    niobj->link.prev = (LINK_ELEMENT *)iobj->link.prev;
+                    niobj->link.next = li;
+                    if (li) {
+                        li->prev = (LINK_ELEMENT *)niobj;
+                    }
+
+                    list->prev->next = (LINK_ELEMENT *)niobj;
+                    list = (LINK_ELEMENT *)niobj;
+                    break;
+                  miss:;
+                }
+            }
+        }
+        list = list->next;
     }
 #endif
     return COMPILE_OK;
 }
 
-#if OPT_STACK_CACHING
-
-#define SC_INSN(insn, stat) sc_insn_info[(insn)][(stat)]
-#define SC_NEXT(insn)       sc_insn_next[(insn)]
-
-#include "opt_sc.inc"
-
 static int
-insn_set_sc_state(rb_iseq_t *iseq, const LINK_ELEMENT *anchor, INSN *iobj, int state)
+all_string_result_p(const NODE *node)
 {
-    int nstate;
-    int insn_id;
-
-    insn_id = iobj->insn_id;
-    iobj->insn_id = SC_INSN(insn_id, state);
-    nstate = SC_NEXT(iobj->insn_id);
-
-    if (insn_id == BIN(jump) ||
-	insn_id == BIN(branchif) || insn_id == BIN(branchunless)) {
-	LABEL *lobj = (LABEL *)OPERAND_AT(iobj, 0);
-
-	if (lobj->sc_state != 0) {
-	    if (lobj->sc_state != nstate) {
-		BADINSN_DUMP(anchor, iobj, lobj);
-		COMPILE_ERROR(iseq, iobj->insn_info.line_no,
-			      "insn_set_sc_state error: %d at "LABEL_FORMAT
-			      ", %d expected\n",
-			      lobj->sc_state, lobj->label_no, nstate);
-		return COMPILE_NG;
-	    }
-	}
-	else {
-	    lobj->sc_state = nstate;
-	}
-	if (insn_id == BIN(jump)) {
-	    nstate = SCS_XX;
-	}
-    }
-    else if (insn_id == BIN(leave)) {
-	nstate = SCS_XX;
+    if (!node) return FALSE;
+    switch (nd_type(node)) {
+      case NODE_STR: case NODE_DSTR: case NODE_FILE:
+        return TRUE;
+      case NODE_IF: case NODE_UNLESS:
+        if (!RNODE_IF(node)->nd_body || !RNODE_IF(node)->nd_else) return FALSE;
+        if (all_string_result_p(RNODE_IF(node)->nd_body))
+            return all_string_result_p(RNODE_IF(node)->nd_else);
+        return FALSE;
+      case NODE_AND: case NODE_OR:
+        if (!RNODE_AND(node)->nd_2nd)
+            return all_string_result_p(RNODE_AND(node)->nd_1st);
+        if (!all_string_result_p(RNODE_AND(node)->nd_1st))
+            return FALSE;
+        return all_string_result_p(RNODE_AND(node)->nd_2nd);
+      default:
+        return FALSE;
     }
-
-    return nstate;
 }
 
+struct dstr_ctxt {
+    rb_iseq_t *const iseq;
+    LINK_ANCHOR *const ret;
+    VALUE lit;
+    const NODE *lit_node;
+    int cnt;
+    int dregx;
+};
+
 static int
-label_set_sc_state(LABEL *lobj, int state)
+append_dstr_fragment(struct dstr_ctxt *args, const NODE *const node, rb_parser_string_t *str)
 {
-    if (lobj->sc_state != 0) {
-	if (lobj->sc_state != state) {
-	    state = lobj->sc_state;
-	}
+    VALUE s = rb_str_new_mutable_parser_string(str);
+    if (args->dregx) {
+        VALUE error = rb_reg_check_preprocess(s);
+        if (!NIL_P(error)) {
+            COMPILE_ERROR(args->iseq, nd_line(node), "%" PRIsVALUE, error);
+            return COMPILE_NG;
+        }
+    }
+    if (NIL_P(args->lit)) {
+        args->lit = s;
+        args->lit_node = node;
     }
     else {
-	lobj->sc_state = state;
+        rb_str_buf_append(args->lit, s);
     }
-
-    return state;
+    return COMPILE_OK;
 }
 
-
-#endif
+static void
+flush_dstr_fragment(struct dstr_ctxt *args)
+{
+    if (!NIL_P(args->lit)) {
+        rb_iseq_t *iseq = args->iseq;
+        VALUE lit = args->lit;
+        args->lit = Qnil;
+        lit = rb_fstring(lit);
+        ADD_INSN1(args->ret, args->lit_node, putobject, lit);
+        RB_OBJ_WRITTEN(args->iseq, Qundef, lit);
+        args->cnt++;
+    }
+}
 
 static int
-iseq_set_sequence_stackcaching(rb_iseq_t *iseq, LINK_ANCHOR *const anchor)
+compile_dstr_fragments_0(struct dstr_ctxt *args, const NODE *const node)
 {
-#if OPT_STACK_CACHING
-    LINK_ELEMENT *list;
-    int state, insn_id;
+    const struct RNode_LIST *list = RNODE_DSTR(node)->nd_next;
+    rb_parser_string_t *str = RNODE_DSTR(node)->string;
 
-    /* initialize */
-    state = SCS_XX;
-    list = FIRST_ELEMENT(anchor);
-    /* dump_disasm_list(list); */
+    if (str) {
+        CHECK(append_dstr_fragment(args, node, str));
+    }
 
-    /* for each list element */
     while (list) {
-      redo_point:
-	switch (list->type) {
-	  case ISEQ_ELEMENT_INSN:
-	    {
-		INSN *iobj = (INSN *)list;
-		insn_id = iobj->insn_id;
-
-		/* dump_disasm_list(list); */
-
-		switch (insn_id) {
-		  case BIN(nop):
-		    {
-			/* exception merge point */
-			if (state != SCS_AX) {
-                            NODE dummy_line_node = generate_dummy_line_node(0, -1);
-			    INSN *rpobj =
-				new_insn_body(iseq, &dummy_line_node, BIN(reput), 0);
-
-			    /* replace this insn */
-			    ELEM_REPLACE(list, (LINK_ELEMENT *)rpobj);
-			    list = (LINK_ELEMENT *)rpobj;
-			    goto redo_point;
-			}
-			break;
-		    }
-		  case BIN(swap):
-		    {
-			if (state == SCS_AB || state == SCS_BA) {
-			    state = (state == SCS_AB ? SCS_BA : SCS_AB);
-
-			    ELEM_REMOVE(list);
-			    list = list->next;
-			    goto redo_point;
-			}
-			break;
-		    }
-		  case BIN(pop):
-		    {
-			switch (state) {
-			  case SCS_AX:
-			  case SCS_BX:
-			    state = SCS_XX;
-			    break;
-			  case SCS_AB:
-			    state = SCS_AX;
-			    break;
-			  case SCS_BA:
-			    state = SCS_BX;
-			    break;
-			  case SCS_XX:
-			    goto normal_insn;
-			  default:
-			    COMPILE_ERROR(iseq, iobj->insn_info.line_no,
-					  "unreachable");
-			    return COMPILE_NG;
-			}
-			/* remove useless pop */
-			ELEM_REMOVE(list);
-			list = list->next;
-			goto redo_point;
-		    }
-		  default:;
-		    /* none */
-		}		/* end of switch */
-	      normal_insn:
-		state = insn_set_sc_state(iseq, anchor, iobj, state);
-		break;
-	    }
-	  case ISEQ_ELEMENT_LABEL:
-	    {
-		LABEL *lobj;
-		lobj = (LABEL *)list;
-
-		state = label_set_sc_state(lobj, state);
-	    }
-	  default:
-	    break;
-	}
-	list = list->next;
+        const NODE *const head = list->nd_head;
+        if (nd_type_p(head, NODE_STR)) {
+            CHECK(append_dstr_fragment(args, node, RNODE_STR(head)->string));
+        }
+        else if (nd_type_p(head, NODE_DSTR)) {
+            CHECK(compile_dstr_fragments_0(args, head));
+        }
+        else {
+            flush_dstr_fragment(args);
+            rb_iseq_t *iseq = args->iseq;
+            CHECK(COMPILE(args->ret, "each string", head));
+            args->cnt++;
+        }
+        list = (struct RNode_LIST *)list->nd_next;
     }
-#endif
     return COMPILE_OK;
 }
 
 static int
-all_string_result_p(const NODE *node)
+compile_dstr_fragments(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE *const node, int *cntp, int dregx)
 {
-    if (!node) return FALSE;
-    switch (nd_type(node)) {
-      case NODE_STR: case NODE_DSTR:
-	return TRUE;
-      case NODE_IF: case NODE_UNLESS:
-	if (!node->nd_body || !node->nd_else) return FALSE;
-	if (all_string_result_p(node->nd_body))
-	    return all_string_result_p(node->nd_else);
-	return FALSE;
-      case NODE_AND: case NODE_OR:
-	if (!node->nd_2nd)
-	    return all_string_result_p(node->nd_1st);
-	if (!all_string_result_p(node->nd_1st))
-	    return FALSE;
-	return all_string_result_p(node->nd_2nd);
-      default:
-	return FALSE;
-    }
-}
-
-static int
-compile_dstr_fragments(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE *const node, int *cntp)
-{
-    const NODE *list = node->nd_next;
-    VALUE lit = node->nd_lit;
-    LINK_ELEMENT *first_lit = 0;
-    int cnt = 0;
+    struct dstr_ctxt args = {
+        .iseq = iseq, .ret = ret,
+        .lit = Qnil, .lit_node = NULL,
+        .cnt = 0, .dregx = dregx,
+    };
+    CHECK(compile_dstr_fragments_0(&args, node));
+    flush_dstr_fragment(&args);
 
-    debugp_param("nd_lit", lit);
-    if (!NIL_P(lit)) {
-	cnt++;
-	if (!RB_TYPE_P(lit, T_STRING)) {
-	    COMPILE_ERROR(ERROR_ARGS "dstr: must be string: %s",
-			  rb_builtin_type_name(TYPE(lit)));
-	    return COMPILE_NG;
-	}
-	lit = rb_fstring(lit);
-	ADD_INSN1(ret, node, putobject, lit);
-        RB_OBJ_WRITTEN(iseq, Qundef, lit);
-	if (RSTRING_LEN(lit) == 0) first_lit = LAST_ELEMENT(ret);
-    }
-
-    while (list) {
-	const NODE *const head = list->nd_head;
-	if (nd_type_p(head, NODE_STR)) {
-	    lit = rb_fstring(head->nd_lit);
-	    ADD_INSN1(ret, head, putobject, lit);
-            RB_OBJ_WRITTEN(iseq, Qundef, lit);
-	    lit = Qnil;
-	}
-	else {
-	    CHECK(COMPILE(ret, "each string", head));
-	}
-	cnt++;
-	list = list->nd_next;
-    }
-    if (NIL_P(lit) && first_lit) {
-	ELEM_REMOVE(first_lit);
-	--cnt;
-    }
-    *cntp = cnt;
+    *cntp = args.cnt;
 
     return COMPILE_OK;
 }
@@ -3953,12 +4714,12 @@ static int
 compile_block(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE *node, int popped)
 {
     while (node && nd_type_p(node, NODE_BLOCK)) {
-        CHECK(COMPILE_(ret, "BLOCK body", node->nd_head,
-                       (node->nd_next ? 1 : popped)));
-        node = node->nd_next;
+        CHECK(COMPILE_(ret, "BLOCK body", RNODE_BLOCK(node)->nd_head,
+                       (RNODE_BLOCK(node)->nd_next ? 1 : popped)));
+        node = RNODE_BLOCK(node)->nd_next;
     }
     if (node) {
-        CHECK(COMPILE_(ret, "BLOCK next", node->nd_next, popped));
+        CHECK(COMPILE_(ret, "BLOCK next", RNODE_BLOCK(node)->nd_next, popped));
     }
     return COMPILE_OK;
 }
@@ -3967,52 +4728,71 @@ static int
 compile_dstr(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE *const node)
 {
     int cnt;
-    if (!node->nd_next) {
-        VALUE lit = rb_fstring(node->nd_lit);
+    if (!RNODE_DSTR(node)->nd_next) {
+        VALUE lit = rb_node_dstr_string_val(node);
         ADD_INSN1(ret, node, putstring, lit);
+        RB_OBJ_SET_SHAREABLE(lit);
         RB_OBJ_WRITTEN(iseq, Qundef, lit);
     }
     else {
-        CHECK(compile_dstr_fragments(iseq, ret, node, &cnt));
+        CHECK(compile_dstr_fragments(iseq, ret, node, &cnt, FALSE));
         ADD_INSN1(ret, node, concatstrings, INT2FIX(cnt));
     }
     return COMPILE_OK;
 }
 
 static int
-compile_dregx(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE *const node)
+compile_dregx(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE *const node, int popped)
 {
     int cnt;
-    CHECK(compile_dstr_fragments(iseq, ret, node, &cnt));
-    ADD_INSN2(ret, node, toregexp, INT2FIX(node->nd_cflag), INT2FIX(cnt));
+    int cflag = (int)RNODE_DREGX(node)->as.nd_cflag;
+
+    if (!RNODE_DREGX(node)->nd_next) {
+        if (!popped) {
+            VALUE src = rb_node_dregx_string_val(node);
+            VALUE match = rb_reg_compile(src, cflag, NULL, 0);
+            RB_OBJ_SET_SHAREABLE(match);
+            ADD_INSN1(ret, node, putobject, match);
+            RB_OBJ_WRITTEN(iseq, Qundef, match);
+        }
+        return COMPILE_OK;
+    }
+
+    CHECK(compile_dstr_fragments(iseq, ret, node, &cnt, TRUE));
+    ADD_INSN2(ret, node, toregexp, INT2FIX(cflag), INT2FIX(cnt));
+
+    if (popped) {
+        ADD_INSN(ret, node, pop);
+    }
+
     return COMPILE_OK;
 }
 
 static int
 compile_flip_flop(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE *const node, int again,
-		  LABEL *then_label, LABEL *else_label)
+                  LABEL *then_label, LABEL *else_label)
 {
     const int line = nd_line(node);
     LABEL *lend = NEW_LABEL(line);
     rb_num_t cnt = ISEQ_FLIP_CNT_INCREMENT(ISEQ_BODY(iseq)->local_iseq)
-	+ VM_SVAR_FLIPFLOP_START;
+        + VM_SVAR_FLIPFLOP_START;
     VALUE key = INT2FIX(cnt);
 
     ADD_INSN2(ret, node, getspecial, key, INT2FIX(0));
     ADD_INSNL(ret, node, branchif, lend);
 
     /* *flip == 0 */
-    CHECK(COMPILE(ret, "flip2 beg", node->nd_beg));
+    CHECK(COMPILE(ret, "flip2 beg", RNODE_FLIP2(node)->nd_beg));
     ADD_INSNL(ret, node, branchunless, else_label);
     ADD_INSN1(ret, node, putobject, Qtrue);
     ADD_INSN1(ret, node, setspecial, key);
     if (!again) {
-	ADD_INSNL(ret, node, jump, then_label);
+        ADD_INSNL(ret, node, jump, then_label);
     }
 
     /* *flip == 1 */
     ADD_LABEL(ret, lend);
-    CHECK(COMPILE(ret, "flip2 end", node->nd_end));
+    CHECK(COMPILE(ret, "flip2 end", RNODE_FLIP2(node)->nd_end));
     ADD_INSNL(ret, node, branchunless, then_label);
     ADD_INSN1(ret, node, putobject, Qfalse);
     ADD_INSN1(ret, node, setspecial, key);
@@ -4022,68 +4802,122 @@ compile_flip_flop(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE *const nod
 }
 
 static int
-compile_branch_condition(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE *cond,
-			 LABEL *then_label, LABEL *else_label)
+compile_branch_condition(rb_iseq_t *iseq, LINK_ANCHOR *ret, const NODE *cond,
+                         LABEL *then_label, LABEL *else_label);
+
+#define COMPILE_SINGLE 2
+static int
+compile_logical(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE *cond,
+                LABEL *then_label, LABEL *else_label)
+{
+    DECL_ANCHOR(seq);
+    INIT_ANCHOR(seq);
+    LABEL *label = NEW_LABEL(nd_line(cond));
+    if (!then_label) then_label = label;
+    else if (!else_label) else_label = label;
+
+    CHECK(compile_branch_condition(iseq, seq, cond, then_label, else_label));
+
+    if (LIST_INSN_SIZE_ONE(seq)) {
+        INSN *insn = (INSN *)ELEM_FIRST_INSN(FIRST_ELEMENT(seq));
+        if (insn->insn_id == BIN(jump) && (LABEL *)(insn->operands[0]) == label)
+            return COMPILE_OK;
+    }
+    if (!label->refcnt) {
+        return COMPILE_SINGLE;
+    }
+    ADD_LABEL(seq, label);
+    ADD_SEQ(ret, seq);
+    return COMPILE_OK;
+}
+
+static int
+compile_branch_condition(rb_iseq_t *iseq, LINK_ANCHOR *ret, const NODE *cond,
+                         LABEL *then_label, LABEL *else_label)
 {
+    int ok;
+    DECL_ANCHOR(ignore);
+
   again:
     switch (nd_type(cond)) {
       case NODE_AND:
-	{
-	    LABEL *label = NEW_LABEL(nd_line(cond));
-	    CHECK(compile_branch_condition(iseq, ret, cond->nd_1st, label,
-					   else_label));
-            if (!label->refcnt) {
-                ADD_INSN(ret, cond, putnil);
-                break;
-            }
-	    ADD_LABEL(ret, label);
-	    cond = cond->nd_2nd;
-	    goto again;
-	}
+        CHECK(ok = compile_logical(iseq, ret, RNODE_AND(cond)->nd_1st, NULL, else_label));
+        cond = RNODE_AND(cond)->nd_2nd;
+        if (ok == COMPILE_SINGLE) {
+            INIT_ANCHOR(ignore);
+            ret = ignore;
+            then_label = NEW_LABEL(nd_line(cond));
+        }
+        goto again;
       case NODE_OR:
-	{
-	    LABEL *label = NEW_LABEL(nd_line(cond));
-	    CHECK(compile_branch_condition(iseq, ret, cond->nd_1st, then_label,
-					   label));
-            if (!label->refcnt) {
-                ADD_INSN(ret, cond, putnil);
-                break;
-            }
-	    ADD_LABEL(ret, label);
-	    cond = cond->nd_2nd;
-	    goto again;
-	}
-      case NODE_LIT:		/* NODE_LIT is always true */
+        CHECK(ok = compile_logical(iseq, ret, RNODE_OR(cond)->nd_1st, then_label, NULL));
+        cond = RNODE_OR(cond)->nd_2nd;
+        if (ok == COMPILE_SINGLE) {
+            INIT_ANCHOR(ignore);
+            ret = ignore;
+            else_label = NEW_LABEL(nd_line(cond));
+        }
+        goto again;
+      case NODE_SYM:
+      case NODE_LINE:
+      case NODE_FILE:
+      case NODE_ENCODING:
+      case NODE_INTEGER:    /* NODE_INTEGER is always true */
+      case NODE_FLOAT:      /* NODE_FLOAT is always true */
+      case NODE_RATIONAL:   /* NODE_RATIONAL is always true */
+      case NODE_IMAGINARY:  /* NODE_IMAGINARY is always true */
       case NODE_TRUE:
       case NODE_STR:
+      case NODE_REGX:
       case NODE_ZLIST:
       case NODE_LAMBDA:
-	/* printf("useless condition eliminate (%s)\n",  ruby_node_name(nd_type(cond))); */
-	ADD_INSNL(ret, cond, jump, then_label);
+        /* printf("useless condition eliminate (%s)\n",  ruby_node_name(nd_type(cond))); */
+        ADD_INSNL(ret, cond, jump, then_label);
         return COMPILE_OK;
       case NODE_FALSE:
       case NODE_NIL:
-	/* printf("useless condition eliminate (%s)\n", ruby_node_name(nd_type(cond))); */
-	ADD_INSNL(ret, cond, jump, else_label);
+        /* printf("useless condition eliminate (%s)\n", ruby_node_name(nd_type(cond))); */
+        ADD_INSNL(ret, cond, jump, else_label);
         return COMPILE_OK;
       case NODE_LIST:
       case NODE_ARGSCAT:
       case NODE_DREGX:
       case NODE_DSTR:
-	CHECK(COMPILE_POPPED(ret, "branch condition", cond));
-	ADD_INSNL(ret, cond, jump, then_label);
+        CHECK(COMPILE_POPPED(ret, "branch condition", cond));
+        ADD_INSNL(ret, cond, jump, then_label);
         return COMPILE_OK;
       case NODE_FLIP2:
-	CHECK(compile_flip_flop(iseq, ret, cond, TRUE, then_label, else_label));
+        CHECK(compile_flip_flop(iseq, ret, cond, TRUE, then_label, else_label));
         return COMPILE_OK;
       case NODE_FLIP3:
-	CHECK(compile_flip_flop(iseq, ret, cond, FALSE, then_label, else_label));
+        CHECK(compile_flip_flop(iseq, ret, cond, FALSE, then_label, else_label));
         return COMPILE_OK;
       case NODE_DEFINED:
-	CHECK(compile_defined_expr(iseq, ret, cond, Qfalse));
+        CHECK(compile_defined_expr(iseq, ret, cond, Qfalse, ret == ignore));
         break;
       default:
-	CHECK(COMPILE(ret, "branch condition", cond));
+        {
+            DECL_ANCHOR(cond_seq);
+            INIT_ANCHOR(cond_seq);
+
+            CHECK(COMPILE(cond_seq, "branch condition", cond));
+
+            if (LIST_INSN_SIZE_ONE(cond_seq)) {
+                INSN *insn = (INSN *)ELEM_FIRST_INSN(FIRST_ELEMENT(cond_seq));
+                if (insn->insn_id == BIN(putobject)) {
+                    if (RTEST(insn->operands[0])) {
+                        ADD_INSNL(ret, cond, jump, then_label);
+                        // maybe unreachable
+                        return COMPILE_OK;
+                    }
+                    else {
+                        ADD_INSNL(ret, cond, jump, else_label);
+                        return COMPILE_OK;
+                    }
+                }
+            }
+            ADD_SEQ(ret, cond_seq);
+        }
         break;
     }
 
@@ -4097,33 +4931,68 @@ compile_branch_condition(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE *co
 static int
 keyword_node_p(const NODE *const node)
 {
-    return nd_type_p(node, NODE_HASH) && (node->nd_brace & HASH_BRACE) != HASH_BRACE;
+    return nd_type_p(node, NODE_HASH) && (RNODE_HASH(node)->nd_brace & HASH_BRACE) != HASH_BRACE;
+}
+
+static VALUE
+get_symbol_value(rb_iseq_t *iseq, const NODE *node)
+{
+    switch (nd_type(node)) {
+      case NODE_SYM:
+        return rb_node_sym_string_val(node);
+      default:
+        UNKNOWN_NODE("get_symbol_value", node, Qnil);
+    }
+}
+
+static VALUE
+node_hash_unique_key_index(rb_iseq_t *iseq, rb_node_hash_t *node_hash, int *count_ptr)
+{
+    NODE *node = node_hash->nd_head;
+    VALUE hash = rb_hash_new();
+    VALUE ary = rb_ary_new();
+
+    for (int i = 0; node != NULL; i++, node = RNODE_LIST(RNODE_LIST(node)->nd_next)->nd_next) {
+        VALUE key = get_symbol_value(iseq, RNODE_LIST(node)->nd_head);
+        VALUE idx = rb_hash_aref(hash, key);
+        if (!NIL_P(idx)) {
+            rb_ary_store(ary, FIX2INT(idx), Qfalse);
+            (*count_ptr)--;
+        }
+        rb_hash_aset(hash, key, INT2FIX(i));
+        rb_ary_store(ary, i, Qtrue);
+        (*count_ptr)++;
+    }
+
+    return ary;
 }
 
 static int
 compile_keyword_arg(rb_iseq_t *iseq, LINK_ANCHOR *const ret,
-			  const NODE *const root_node,
-			  struct rb_callinfo_kwarg **const kw_arg_ptr,
-			  unsigned int *flag)
+                    const NODE *const root_node,
+                    struct rb_callinfo_kwarg **const kw_arg_ptr,
+                    unsigned int *flag)
 {
-    if (kw_arg_ptr == NULL) return FALSE;
+    RUBY_ASSERT(nd_type_p(root_node, NODE_HASH));
+    RUBY_ASSERT(kw_arg_ptr != NULL);
+    RUBY_ASSERT(flag != NULL);
 
-    if (root_node->nd_head && nd_type_p(root_node->nd_head, NODE_LIST)) {
-	const NODE *node = root_node->nd_head;
+    if (RNODE_HASH(root_node)->nd_head && nd_type_p(RNODE_HASH(root_node)->nd_head, NODE_LIST)) {
+        const NODE *node = RNODE_HASH(root_node)->nd_head;
         int seen_nodes = 0;
 
-	while (node) {
-	    const NODE *key_node = node->nd_head;
+        while (node) {
+            const NODE *key_node = RNODE_LIST(node)->nd_head;
             seen_nodes++;
 
-	    assert(nd_type_p(node, NODE_LIST));
-            if (key_node && nd_type_p(key_node, NODE_LIT) && SYMBOL_P(key_node->nd_lit)) {
-		/* can be keywords */
-	    }
-	    else {
+            RUBY_ASSERT(nd_type_p(node, NODE_LIST));
+            if (key_node && nd_type_p(key_node, NODE_SYM)) {
+                /* can be keywords */
+            }
+            else {
                 if (flag) {
                     *flag |= VM_CALL_KW_SPLAT;
-                    if (seen_nodes > 1 || node->nd_next->nd_next) {
+                    if (seen_nodes > 1 || RNODE_LIST(RNODE_LIST(node)->nd_next)->nd_next) {
                         /* A new hash will be created for the keyword arguments
                          * in this case, so mark the method as passing mutable
                          * keyword splat.
@@ -4131,77 +5000,94 @@ compile_keyword_arg(rb_iseq_t *iseq, LINK_ANCHOR *const ret,
                         *flag |= VM_CALL_KW_SPLAT_MUT;
                     }
                 }
-		return FALSE;
-	    }
-	    node = node->nd_next; /* skip value node */
-	    node = node->nd_next;
-	}
-
-	/* may be keywords */
-	node = root_node->nd_head;
-	{
-	    int len = (int)node->nd_alen / 2;
+                return FALSE;
+            }
+            node = RNODE_LIST(node)->nd_next; /* skip value node */
+            node = RNODE_LIST(node)->nd_next;
+        }
+
+        /* may be keywords */
+        node = RNODE_HASH(root_node)->nd_head;
+        {
+            int len = 0;
+            VALUE key_index = node_hash_unique_key_index(iseq, RNODE_HASH(root_node), &len);
             struct rb_callinfo_kwarg *kw_arg =
                 rb_xmalloc_mul_add(len, sizeof(VALUE), sizeof(struct rb_callinfo_kwarg));
-	    VALUE *keywords = kw_arg->keywords;
-	    int i = 0;
-	    kw_arg->keyword_len = len;
-
-	    *kw_arg_ptr = kw_arg;
-
-	    for (i=0; node != NULL; i++, node = node->nd_next->nd_next) {
-		const NODE *key_node = node->nd_head;
-		const NODE *val_node = node->nd_next->nd_head;
-		keywords[i] = key_node->nd_lit;
-                NO_CHECK(COMPILE(ret, "keyword values", val_node));
-	    }
-	    assert(i == len);
-	    return TRUE;
-	}
+            VALUE *keywords = kw_arg->keywords;
+            int i = 0;
+            int j = 0;
+            kw_arg->references = 0;
+            kw_arg->keyword_len = len;
+
+            *kw_arg_ptr = kw_arg;
+
+            for (i=0; node != NULL; i++, node = RNODE_LIST(RNODE_LIST(node)->nd_next)->nd_next) {
+                const NODE *key_node = RNODE_LIST(node)->nd_head;
+                const NODE *val_node = RNODE_LIST(RNODE_LIST(node)->nd_next)->nd_head;
+                int popped = TRUE;
+                if (rb_ary_entry(key_index, i)) {
+                    keywords[j] = get_symbol_value(iseq, key_node);
+                    j++;
+                    popped = FALSE;
+                }
+                NO_CHECK(COMPILE_(ret, "keyword values", val_node, popped));
+            }
+            RUBY_ASSERT(j == len);
+            return TRUE;
+        }
     }
     return FALSE;
 }
 
 static int
-compile_args(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE *node,
-                   struct rb_callinfo_kwarg **keywords_ptr, unsigned int *flag)
+compile_args(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE *node, NODE **kwnode_ptr)
 {
     int len = 0;
 
-    for (; node; len++, node = node->nd_next) {
+    for (; node; len++, node = RNODE_LIST(node)->nd_next) {
         if (CPDEBUG > 0) {
             EXPECT_NODE("compile_args", node, NODE_LIST, -1);
         }
 
-        if (node->nd_next == NULL && keyword_node_p(node->nd_head)) { /* last node */
-            if (compile_keyword_arg(iseq, ret, node->nd_head, keywords_ptr, flag)) {
-                len--;
-            }
-            else {
-                compile_hash(iseq, ret, node->nd_head, TRUE, FALSE);
-            }
+        if (RNODE_LIST(node)->nd_next == NULL && keyword_node_p(RNODE_LIST(node)->nd_head)) { /* last node is kwnode */
+            *kwnode_ptr = RNODE_LIST(node)->nd_head;
         }
         else {
-            NO_CHECK(COMPILE_(ret, "array element", node->nd_head, FALSE));
+            RUBY_ASSERT(!keyword_node_p(RNODE_LIST(node)->nd_head));
+            NO_CHECK(COMPILE_(ret, "array element", RNODE_LIST(node)->nd_head, FALSE));
         }
     }
 
     return len;
 }
 
-static inline int
-static_literal_node_p(const NODE *node, const rb_iseq_t *iseq)
+static inline bool
+frozen_string_literal_p(const rb_iseq_t *iseq)
+{
+    return ISEQ_COMPILE_DATA(iseq)->option->frozen_string_literal > 0;
+}
+
+static inline bool
+static_literal_node_p(const NODE *node, const rb_iseq_t *iseq, bool hash_key)
 {
     switch (nd_type(node)) {
-      case NODE_LIT:
+      case NODE_SYM:
+      case NODE_REGX:
+      case NODE_LINE:
+      case NODE_ENCODING:
+      case NODE_INTEGER:
+      case NODE_FLOAT:
+      case NODE_RATIONAL:
+      case NODE_IMAGINARY:
       case NODE_NIL:
       case NODE_TRUE:
       case NODE_FALSE:
-	return TRUE;
+        return TRUE;
       case NODE_STR:
-        return ISEQ_COMPILE_DATA(iseq)->option->frozen_string_literal;
+      case NODE_FILE:
+        return hash_key || frozen_string_literal_p(iseq);
       default:
-	return FALSE;
+        return FALSE;
     }
 }
 
@@ -4209,45 +5095,69 @@ static inline VALUE
 static_literal_value(const NODE *node, rb_iseq_t *iseq)
 {
     switch (nd_type(node)) {
+      case NODE_INTEGER:
+        {
+            VALUE lit = rb_node_integer_literal_val(node);
+            if (!SPECIAL_CONST_P(lit)) RB_OBJ_SET_SHAREABLE(lit);
+            return lit;
+        }
+      case NODE_FLOAT:
+        {
+            VALUE lit = rb_node_float_literal_val(node);
+            if (!SPECIAL_CONST_P(lit)) RB_OBJ_SET_SHAREABLE(lit);
+            return lit;
+        }
+      case NODE_RATIONAL:
+        return rb_ractor_make_shareable(rb_node_rational_literal_val(node));
+      case NODE_IMAGINARY:
+        return rb_ractor_make_shareable(rb_node_imaginary_literal_val(node));
       case NODE_NIL:
-	return Qnil;
+        return Qnil;
       case NODE_TRUE:
-	return Qtrue;
+        return Qtrue;
       case NODE_FALSE:
-	return Qfalse;
+        return Qfalse;
+      case NODE_SYM:
+        return rb_node_sym_string_val(node);
+      case NODE_REGX:
+        return RB_OBJ_SET_SHAREABLE(rb_node_regx_string_val(node));
+      case NODE_LINE:
+        return rb_node_line_lineno_val(node);
+      case NODE_ENCODING:
+        return rb_node_encoding_val(node);
+      case NODE_FILE:
       case NODE_STR:
         if (ISEQ_COMPILE_DATA(iseq)->option->debug_frozen_string_literal || RTEST(ruby_debug)) {
-            VALUE lit;
-            VALUE debug_info = rb_ary_new_from_args(2, rb_iseq_path(iseq), INT2FIX((int)nd_line(node)));
-            lit = rb_str_dup(node->nd_lit);
-            rb_ivar_set(lit, id_debug_created_info, rb_obj_freeze(debug_info));
-            return rb_str_freeze(lit);
+            VALUE lit = get_string_value(node);
+            VALUE str = rb_str_with_debug_created_info(lit, rb_iseq_path(iseq), (int)nd_line(node));
+            RB_OBJ_SET_SHAREABLE(str);
+            return str;
         }
         else {
-            return rb_fstring(node->nd_lit);
+            return get_string_value(node);
         }
       default:
-	return node->nd_lit;
+        rb_bug("unexpected node: %s", ruby_node_name(nd_type(node)));
     }
 }
 
 static int
-compile_array(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE *node, int popped)
+compile_array(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE *node, int popped, bool first_chunk)
 {
     const NODE *line_node = node;
 
     if (nd_type_p(node, NODE_ZLIST)) {
-	if (!popped) {
-	    ADD_INSN1(ret, line_node, newarray, INT2FIX(0));
-	}
+        if (!popped) {
+            ADD_INSN1(ret, line_node, newarray, INT2FIX(0));
+        }
         return 0;
     }
 
     EXPECT_NODE("compile_array", node, NODE_LIST, -1);
 
     if (popped) {
-        for (; node; node = node->nd_next) {
-            NO_CHECK(COMPILE_(ret, "array element", node->nd_head, popped));
+        for (; node; node = RNODE_LIST(node)->nd_next) {
+            NO_CHECK(COMPILE_(ret, "array element", RNODE_LIST(node)->nd_head, popped));
         }
         return 1;
     }
@@ -4267,8 +5177,8 @@ compile_array(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE *node, int pop
      *
      *   [x1,x2,...,x10000] =>
      *     push x1  ; push x2  ; ...; push x256; newarray 256;
-     *     push x257; push x258; ...; push x512; newarray 256; concatarray;
-     *     push x513; push x514; ...; push x768; newarray 256; concatarray;
+     *     push x257; push x258; ...; push x512; pushtoarray 256;
+     *     push x513; push x514; ...; push x768; pushtoarray 256;
      *     ...
      *
      * - Long subarray can be optimized by pre-allocating a hidden array.
@@ -4278,111 +5188,101 @@ compile_array(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE *node, int pop
      *
      *   [x, 1,2,3,...,100, z] =>
      *     push x; newarray 1;
-     *     putobject [1,2,3,...,100] (<- hidden array); concatarray;
-     *     push z; newarray 1; concatarray
+     *     putobject [1,2,3,...,100] (<- hidden array); concattoarray;
+     *     push z; pushtoarray 1;
      *
-     * - If the last element is a keyword, newarraykwsplat should be emitted
-     *   to check and remove empty keyword arguments hash from array.
+     * - If the last element is a keyword, pushtoarraykwsplat should be emitted
+     *   to only push it onto the array if it is not empty
      *   (Note: a keyword is NODE_HASH which is not static_literal_node_p.)
      *
      *   [1,2,3,**kw] =>
-     *     putobject 1; putobject 2; putobject 3; push kw; newarraykwsplat
+     *     putobject 1; putobject 2; putobject 3; newarray 3; ...; pushtoarraykwsplat kw
      */
 
     const int max_stack_len = 0x100;
     const int min_tmp_ary_len = 0x40;
     int stack_len = 0;
-    int first_chunk = 1;
 
-    /* Convert pushed elements to an array, and concatarray if needed */
-#define FLUSH_CHUNK(newarrayinsn)                               \
+    /* Either create a new array, or push to the existing array */
+#define FLUSH_CHUNK \
     if (stack_len) {                                            \
-        ADD_INSN1(ret, line_node, newarrayinsn, INT2FIX(stack_len)); \
-        if (!first_chunk) ADD_INSN(ret, line_node, concatarray);     \
-        first_chunk = stack_len = 0;                            \
+        if (first_chunk) ADD_INSN1(ret, line_node, newarray, INT2FIX(stack_len)); \
+        else ADD_INSN1(ret, line_node, pushtoarray, INT2FIX(stack_len));     \
+        first_chunk = FALSE; \
+        stack_len = 0;                            \
     }
 
     while (node) {
         int count = 1;
 
         /* pre-allocation check (this branch can be omittable) */
-        if (static_literal_node_p(node->nd_head, iseq)) {
+        if (static_literal_node_p(RNODE_LIST(node)->nd_head, iseq, false)) {
             /* count the elements that are optimizable */
-            const NODE *node_tmp = node->nd_next;
-            for (; node_tmp && static_literal_node_p(node_tmp->nd_head, iseq); node_tmp = node_tmp->nd_next)
+            const NODE *node_tmp = RNODE_LIST(node)->nd_next;
+            for (; node_tmp && static_literal_node_p(RNODE_LIST(node_tmp)->nd_head, iseq, false); node_tmp = RNODE_LIST(node_tmp)->nd_next)
                 count++;
 
             if ((first_chunk && stack_len == 0 && !node_tmp) || count >= min_tmp_ary_len) {
                 /* The literal contains only optimizable elements, or the subarray is long enough */
-                VALUE ary = rb_ary_tmp_new(count);
+                VALUE ary = rb_ary_hidden_new(count);
 
                 /* Create a hidden array */
-                for (; count; count--, node = node->nd_next)
-                    rb_ary_push(ary, static_literal_value(node->nd_head, iseq));
-                OBJ_FREEZE(ary);
+                for (; count; count--, node = RNODE_LIST(node)->nd_next)
+                    rb_ary_push(ary, static_literal_value(RNODE_LIST(node)->nd_head, iseq));
+                RB_OBJ_SET_FROZEN_SHAREABLE(ary);
 
                 /* Emit optimized code */
-                FLUSH_CHUNK(newarray);
+                FLUSH_CHUNK;
                 if (first_chunk) {
                     ADD_INSN1(ret, line_node, duparray, ary);
-                    first_chunk = 0;
+                    first_chunk = FALSE;
                 }
                 else {
                     ADD_INSN1(ret, line_node, putobject, ary);
-                    ADD_INSN(ret, line_node, concatarray);
+                    ADD_INSN(ret, line_node, concattoarray);
                 }
+                RB_OBJ_SET_SHAREABLE(ary);
                 RB_OBJ_WRITTEN(iseq, Qundef, ary);
             }
         }
 
         /* Base case: Compile "count" elements */
-        for (; count; count--, node = node->nd_next) {
+        for (; count; count--, node = RNODE_LIST(node)->nd_next) {
             if (CPDEBUG > 0) {
                 EXPECT_NODE("compile_array", node, NODE_LIST, -1);
             }
 
-            NO_CHECK(COMPILE_(ret, "array element", node->nd_head, 0));
-            stack_len++;
-
-            if (!node->nd_next && keyword_node_p(node->nd_head)) {
-                /* Reached the end, and the last element is a keyword */
-                FLUSH_CHUNK(newarraykwsplat);
+            if (!RNODE_LIST(node)->nd_next && keyword_node_p(RNODE_LIST(node)->nd_head)) {
+                /* Create array or push existing non-keyword elements onto array */
+                if (stack_len == 0 && first_chunk) {
+                    ADD_INSN1(ret, line_node, newarray, INT2FIX(0));
+                }
+                else {
+                    FLUSH_CHUNK;
+                }
+                NO_CHECK(COMPILE_(ret, "array element", RNODE_LIST(node)->nd_head, 0));
+                ADD_INSN(ret, line_node, pushtoarraykwsplat);
                 return 1;
             }
+            else {
+                NO_CHECK(COMPILE_(ret, "array element", RNODE_LIST(node)->nd_head, 0));
+                stack_len++;
+            }
 
             /* If there are many pushed elements, flush them to avoid stack overflow */
-            if (stack_len >= max_stack_len) FLUSH_CHUNK(newarray);
+            if (stack_len >= max_stack_len) FLUSH_CHUNK;
         }
     }
 
-    FLUSH_CHUNK(newarray);
+    FLUSH_CHUNK;
 #undef FLUSH_CHUNK
     return 1;
 }
 
-/* Compile an array containing the single element represented by node */
-static int
-compile_array_1(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE *node)
-{
-    if (static_literal_node_p(node, iseq)) {
-        VALUE ary = rb_ary_tmp_new(1);
-        rb_ary_push(ary, static_literal_value(node, iseq));
-        OBJ_FREEZE(ary);
-
-        ADD_INSN1(ret, node, duparray, ary);
-    }
-    else {
-        CHECK(COMPILE_(ret, "array element", node, FALSE));
-        ADD_INSN1(ret, node, newarray, INT2FIX(1));
-    }
-
-    return 1;
-}
-
 static inline int
 static_literal_node_pair_p(const NODE *node, const rb_iseq_t *iseq)
 {
-    return node->nd_head && static_literal_node_p(node->nd_head, iseq) && static_literal_node_p(node->nd_next->nd_head, iseq);
+    return RNODE_LIST(node)->nd_head && static_literal_node_p(RNODE_LIST(node)->nd_head, iseq, true) && static_literal_node_p(RNODE_LIST(RNODE_LIST(node)->nd_next)->nd_head, iseq, false);
 }
 
 static int
@@ -4390,20 +5290,20 @@ compile_hash(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE *node, int meth
 {
     const NODE *line_node = node;
 
-    node = node->nd_head;
+    node = RNODE_HASH(node)->nd_head;
 
     if (!node || nd_type_p(node, NODE_ZLIST)) {
-	if (!popped) {
-	    ADD_INSN1(ret, line_node, newhash, INT2FIX(0));
-	}
+        if (!popped) {
+            ADD_INSN1(ret, line_node, newhash, INT2FIX(0));
+        }
         return 0;
     }
 
     EXPECT_NODE("compile_hash", node, NODE_LIST, -1);
 
     if (popped) {
-        for (; node; node = node->nd_next) {
-            NO_CHECK(COMPILE_(ret, "hash element", node->nd_head, popped));
+        for (; node; node = RNODE_LIST(node)->nd_next) {
+            NO_CHECK(COMPILE_(ret, "hash element", RNODE_LIST(node)->nd_head, popped));
         }
         return 1;
     }
@@ -4456,25 +5356,26 @@ compile_hash(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE *node, int meth
         /* pre-allocation check (this branch can be omittable) */
         if (static_literal_node_pair_p(node, iseq)) {
             /* count the elements that are optimizable */
-            const NODE *node_tmp = node->nd_next->nd_next;
-            for (; node_tmp && static_literal_node_pair_p(node_tmp, iseq); node_tmp = node_tmp->nd_next->nd_next)
+            const NODE *node_tmp = RNODE_LIST(RNODE_LIST(node)->nd_next)->nd_next;
+            for (; node_tmp && static_literal_node_pair_p(node_tmp, iseq); node_tmp = RNODE_LIST(RNODE_LIST(node_tmp)->nd_next)->nd_next)
                 count++;
 
             if ((first_chunk && stack_len == 0 && !node_tmp) || count >= min_tmp_hash_len) {
                 /* The literal contains only optimizable elements, or the subsequence is long enough */
-                VALUE ary = rb_ary_tmp_new(count);
+                VALUE ary = rb_ary_hidden_new(count);
 
                 /* Create a hidden hash */
-                for (; count; count--, node = node->nd_next->nd_next) {
+                for (; count; count--, node = RNODE_LIST(RNODE_LIST(node)->nd_next)->nd_next) {
                     VALUE elem[2];
-                    elem[0] = static_literal_value(node->nd_head, iseq);
-                    elem[1] = static_literal_value(node->nd_next->nd_head, iseq);
+                    elem[0] = static_literal_value(RNODE_LIST(node)->nd_head, iseq);
+                    if (!RB_SPECIAL_CONST_P(elem[0])) RB_OBJ_SET_FROZEN_SHAREABLE(elem[0]);
+                    elem[1] = static_literal_value(RNODE_LIST(RNODE_LIST(node)->nd_next)->nd_head, iseq);
+                    if (!RB_SPECIAL_CONST_P(elem[1])) RB_OBJ_SET_FROZEN_SHAREABLE(elem[1]);
                     rb_ary_cat(ary, elem, 2);
                 }
                 VALUE hash = rb_hash_new_with_size(RARRAY_LEN(ary) / 2);
-                rb_hash_bulk_insert(RARRAY_LEN(ary), RARRAY_CONST_PTR_TRANSIENT(ary), hash);
-                hash = rb_obj_hide(hash);
-                OBJ_FREEZE(hash);
+                rb_hash_bulk_insert(RARRAY_LEN(ary), RARRAY_CONST_PTR(ary), hash);
+                hash = RB_OBJ_SET_FROZEN_SHAREABLE(rb_obj_hide(hash));
 
                 /* Emit optimized code */
                 FLUSH_CHUNK();
@@ -4495,16 +5396,16 @@ compile_hash(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE *node, int meth
         }
 
         /* Base case: Compile "count" elements */
-        for (; count; count--, node = node->nd_next->nd_next) {
+        for (; count; count--, node = RNODE_LIST(RNODE_LIST(node)->nd_next)->nd_next) {
 
             if (CPDEBUG > 0) {
                 EXPECT_NODE("compile_hash", node, NODE_LIST, -1);
             }
 
-            if (node->nd_head) {
+            if (RNODE_LIST(node)->nd_head) {
                 /* Normal key-value pair */
-                NO_CHECK(COMPILE_(anchor, "hash key element", node->nd_head, 0));
-                NO_CHECK(COMPILE_(anchor, "hash value element", node->nd_next->nd_head, 0));
+                NO_CHECK(COMPILE_(anchor, "hash key element", RNODE_LIST(node)->nd_head, 0));
+                NO_CHECK(COMPILE_(anchor, "hash value element", RNODE_LIST(RNODE_LIST(node)->nd_next)->nd_head, 0));
                 stack_len += 2;
 
                 /* If there are many pushed elements, flush them to avoid stack overflow */
@@ -4514,12 +5415,13 @@ compile_hash(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE *node, int meth
                 /* kwsplat case: foo(..., **kw, ...) */
                 FLUSH_CHUNK();
 
-                const NODE *kw = node->nd_next->nd_head;
-                int empty_kw = nd_type_p(kw, NODE_LIT) && RB_TYPE_P(kw->nd_lit, T_HASH); /* foo(  ..., **{}, ...) */
+                const NODE *kw = RNODE_LIST(RNODE_LIST(node)->nd_next)->nd_head;
+                int empty_kw = nd_type_p(kw, NODE_HASH) && (!RNODE_HASH(kw)->nd_head); /* foo(  ..., **{}, ...) */
                 int first_kw = first_chunk && stack_len == 0; /* foo(1,2,3, **kw, ...) */
-                int last_kw = !node->nd_next->nd_next;        /* foo(  ..., **kw) */
+                int last_kw = !RNODE_LIST(RNODE_LIST(node)->nd_next)->nd_next; /* foo(  ..., **kw) */
                 int only_kw = last_kw && first_kw;            /* foo(1,2,3, **kw) */
 
+                empty_kw = empty_kw || nd_type_p(kw, NODE_NIL); /* foo(  ..., **nil, ...) */
                 if (empty_kw) {
                     if (only_kw && method_call_keywords) {
                         /* **{} appears at the only keyword argument in method call,
@@ -4579,63 +5481,68 @@ VALUE
 rb_node_case_when_optimizable_literal(const NODE *const node)
 {
     switch (nd_type(node)) {
-      case NODE_LIT: {
-	VALUE v = node->nd_lit;
-	double ival;
-	if (RB_FLOAT_TYPE_P(v) &&
-	    modf(RFLOAT_VALUE(v), &ival) == 0.0) {
-	    return FIXABLE(ival) ? LONG2FIX((long)ival) : rb_dbl2big(ival);
-	}
-        if (RB_TYPE_P(v, T_RATIONAL) || RB_TYPE_P(v, T_COMPLEX)) {
-            return Qundef;
-        }
-	if (SYMBOL_P(v) || rb_obj_is_kind_of(v, rb_cNumeric)) {
-	    return v;
-	}
-	break;
+      case NODE_INTEGER:
+        return rb_node_integer_literal_val(node);
+      case NODE_FLOAT: {
+        VALUE v = rb_node_float_literal_val(node);
+        double ival;
+
+        if (modf(RFLOAT_VALUE(v), &ival) == 0.0) {
+            return FIXABLE(ival) ? LONG2FIX((long)ival) : rb_dbl2big(ival);
+        }
+        return v;
       }
+      case NODE_RATIONAL:
+      case NODE_IMAGINARY:
+        return Qundef;
       case NODE_NIL:
-	return Qnil;
+        return Qnil;
       case NODE_TRUE:
-	return Qtrue;
+        return Qtrue;
       case NODE_FALSE:
-	return Qfalse;
+        return Qfalse;
+      case NODE_SYM:
+        return rb_node_sym_string_val(node);
+      case NODE_LINE:
+        return rb_node_line_lineno_val(node);
       case NODE_STR:
-	return rb_fstring(node->nd_lit);
+        return rb_node_str_string_val(node);
+      case NODE_FILE:
+        return rb_node_file_path_val(node);
     }
     return Qundef;
 }
 
 static int
 when_vals(rb_iseq_t *iseq, LINK_ANCHOR *const cond_seq, const NODE *vals,
-	  LABEL *l1, int only_special_literals, VALUE literals)
+          LABEL *l1, int only_special_literals, VALUE literals)
 {
     while (vals) {
-	const NODE *val = vals->nd_head;
+        const NODE *val = RNODE_LIST(vals)->nd_head;
         VALUE lit = rb_node_case_when_optimizable_literal(val);
 
-	if (lit == Qundef) {
-	    only_special_literals = 0;
-	}
+        if (UNDEF_P(lit)) {
+            only_special_literals = 0;
+        }
         else if (NIL_P(rb_hash_lookup(literals, lit))) {
             rb_hash_aset(literals, lit, (VALUE)(l1) | 1);
-	}
+        }
 
-	if (nd_type_p(val, NODE_STR)) {
-	    debugp_param("nd_lit", val->nd_lit);
-	    lit = rb_fstring(val->nd_lit);
-	    ADD_INSN1(cond_seq, val, putobject, lit);
+        if (nd_type_p(val, NODE_STR) || nd_type_p(val, NODE_FILE)) {
+            debugp_param("nd_lit", get_string_value(val));
+            lit = get_string_value(val);
+            ADD_INSN1(cond_seq, val, putobject, lit);
             RB_OBJ_WRITTEN(iseq, Qundef, lit);
-	}
-	else {
-	    if (!COMPILE(cond_seq, "when cond", val)) return -1;
-	}
+        }
+        else {
+            if (!COMPILE(cond_seq, "when cond", val)) return -1;
+        }
 
-        // Emit patern === target
+        // Emit pattern === target
         ADD_INSN1(cond_seq, vals, topn, INT2FIX(1));
         ADD_CALL(cond_seq, vals, idEqq, INT2FIX(1));
-	ADD_INSNL(cond_seq, val, branchif, l1);
-	vals = vals->nd_next;
+        ADD_INSNL(cond_seq, val, branchif, l1);
+        vals = RNODE_LIST(vals)->nd_next;
     }
     return only_special_literals;
 }
@@ -4653,19 +5560,19 @@ when_splat_vals(rb_iseq_t *iseq, LINK_ANCHOR *const cond_seq, const NODE *vals,
         break;
       case NODE_SPLAT:
         ADD_INSN (cond_seq, line_node, dup);
-        CHECK(COMPILE(cond_seq, "when splat", vals->nd_head));
+        CHECK(COMPILE(cond_seq, "when splat", RNODE_SPLAT(vals)->nd_head));
         ADD_INSN1(cond_seq, line_node, splatarray, Qfalse);
         ADD_INSN1(cond_seq, line_node, checkmatch, INT2FIX(VM_CHECKMATCH_TYPE_CASE | VM_CHECKMATCH_ARRAY));
         ADD_INSNL(cond_seq, line_node, branchif, l1);
         break;
       case NODE_ARGSCAT:
-        CHECK(when_splat_vals(iseq, cond_seq, vals->nd_head, l1, only_special_literals, literals));
-        CHECK(when_splat_vals(iseq, cond_seq, vals->nd_body, l1, only_special_literals, literals));
+        CHECK(when_splat_vals(iseq, cond_seq, RNODE_ARGSCAT(vals)->nd_head, l1, only_special_literals, literals));
+        CHECK(when_splat_vals(iseq, cond_seq, RNODE_ARGSCAT(vals)->nd_body, l1, only_special_literals, literals));
         break;
       case NODE_ARGSPUSH:
-        CHECK(when_splat_vals(iseq, cond_seq, vals->nd_head, l1, only_special_literals, literals));
+        CHECK(when_splat_vals(iseq, cond_seq, RNODE_ARGSPUSH(vals)->nd_head, l1, only_special_literals, literals));
         ADD_INSN (cond_seq, line_node, dup);
-        CHECK(COMPILE(cond_seq, "when argspush body", vals->nd_body));
+        CHECK(COMPILE(cond_seq, "when argspush body", RNODE_ARGSPUSH(vals)->nd_body));
         ADD_INSN1(cond_seq, line_node, checkmatch, INT2FIX(VM_CHECKMATCH_TYPE_CASE));
         ADD_INSNL(cond_seq, line_node, branchif, l1);
         break;
@@ -4782,7 +5689,8 @@ struct masgn_state {
 };
 
 static int
-add_masgn_lhs_node(struct masgn_state *state, int lhs_pos, const NODE *line_node, int argc, INSN *before_insn) {
+add_masgn_lhs_node(struct masgn_state *state, int lhs_pos, const NODE *line_node, int argc, INSN *before_insn)
+{
     if (!state) {
         rb_bug("no masgn_state");
     }
@@ -4818,17 +5726,22 @@ compile_massign_lhs(rb_iseq_t *iseq, LINK_ANCHOR *const pre, LINK_ANCHOR *const
 {
     switch (nd_type(node)) {
       case NODE_ATTRASGN: {
-	INSN *iobj;
+        INSN *iobj;
         const NODE *line_node = node;
 
         CHECK(COMPILE_POPPED(pre, "masgn lhs (NODE_ATTRASGN)", node));
 
+        bool safenav_call = false;
         LINK_ELEMENT *insn_element = LAST_ELEMENT(pre);
         iobj = (INSN *)get_prev_insn((INSN *)insn_element); /* send insn */
-	ASSUME(iobj);
-        ELEM_REMOVE(LAST_ELEMENT(pre));
-        ELEM_REMOVE((LINK_ELEMENT *)iobj);
-        pre->last = iobj->link.prev;
+        ASSUME(iobj);
+        ELEM_REMOVE(insn_element);
+        if (!IS_INSN_ID(iobj, send)) {
+            safenav_call = true;
+            iobj = (INSN *)get_prev_insn(iobj);
+            ELEM_INSERT_NEXT(&iobj->link, insn_element);
+        }
+        (pre->last = iobj->link.prev)->next = 0;
 
         const struct rb_callinfo *ci = (struct rb_callinfo *)OPERAND_AT(iobj, 0);
         int argc = vm_ci_argc(ci) + 1;
@@ -4847,23 +5760,51 @@ compile_massign_lhs(rb_iseq_t *iseq, LINK_ANCHOR *const pre, LINK_ANCHOR *const
             return COMPILE_NG;
         }
 
-        ADD_ELEM(lhs, (LINK_ELEMENT *)iobj);
-	if (vm_ci_flag(ci) & VM_CALL_ARGS_SPLAT) {
+        iobj->link.prev = lhs->last;
+        lhs->last->next = &iobj->link;
+        for (lhs->last = &iobj->link; lhs->last->next; lhs->last = lhs->last->next);
+        if (vm_ci_flag(ci) & VM_CALL_ARGS_SPLAT) {
             int argc = vm_ci_argc(ci);
+            bool dupsplat = false;
             ci = ci_argc_set(iseq, ci, argc - 1);
+            if (!(vm_ci_flag(ci) & VM_CALL_ARGS_SPLAT_MUT)) {
+                /* Given h[*a], _ = ary
+                 * setup_args sets VM_CALL_ARGS_SPLAT and not VM_CALL_ARGS_SPLAT_MUT
+                 * `a` must be dupped, because it will be appended with ary[0]
+                 * Since you are dupping `a`, you can set VM_CALL_ARGS_SPLAT_MUT
+                 */
+                dupsplat = true;
+                ci = ci_flag_set(iseq, ci, VM_CALL_ARGS_SPLAT_MUT);
+            }
             OPERAND_AT(iobj, 0) = (VALUE)ci;
             RB_OBJ_WRITTEN(iseq, Qundef, iobj);
-            INSERT_BEFORE_INSN1(iobj, line_node, newarray, INT2FIX(1));
-	    INSERT_BEFORE_INSN(iobj, line_node, concatarray);
-	}
-        ADD_INSN(lhs, line_node, pop);
-        if (argc != 1) {
+
+            /* Given: h[*a], h[*b, 1] = ary
+             *  h[*a] uses splatarray false and does not set VM_CALL_ARGS_SPLAT_MUT,
+             *    so this uses splatarray true on a to dup it before using pushtoarray
+             *  h[*b, 1] uses splatarray true and sets VM_CALL_ARGS_SPLAT_MUT,
+             *    so you can use pushtoarray directly
+             */
+            int line_no = nd_line(line_node);
+            int node_id = nd_node_id(line_node);
+
+            if (dupsplat) {
+                INSERT_BEFORE_INSN(iobj, line_no, node_id, swap);
+                INSERT_BEFORE_INSN1(iobj, line_no, node_id, splatarray, Qtrue);
+                INSERT_BEFORE_INSN(iobj, line_no, node_id, swap);
+            }
+            INSERT_BEFORE_INSN1(iobj, line_no, node_id, pushtoarray, INT2FIX(1));
+        }
+        if (!safenav_call) {
             ADD_INSN(lhs, line_node, pop);
+            if (argc != 1) {
+                ADD_INSN(lhs, line_node, pop);
+            }
         }
         for (int i=0; i < argc; i++) {
             ADD_INSN(post, line_node, pop);
         }
-	break;
+        break;
       }
       case NODE_MASGN: {
         DECL_ANCHOR(nest_rhs);
@@ -4881,10 +5822,10 @@ compile_massign_lhs(rb_iseq_t *iseq, LINK_ANCHOR *const pre, LINK_ANCHOR *const
 
         ADD_SEQ(lhs, nest_rhs);
         ADD_SEQ(lhs, nest_lhs);
-	break;
+        break;
       }
       case NODE_CDECL:
-        if (!node->nd_vid) {
+        if (!RNODE_CDECL(node)->nd_vid) {
             /* Special handling only needed for expr::C, not for C */
             INSN *iobj;
 
@@ -4907,10 +5848,10 @@ compile_massign_lhs(rb_iseq_t *iseq, LINK_ANCHOR *const pre, LINK_ANCHOR *const
         }
         /* Fallthrough */
       default: {
-	DECL_ANCHOR(anchor);
-	INIT_ANCHOR(anchor);
-	CHECK(COMPILE_POPPED(anchor, "masgn lhs", node));
-	ELEM_REMOVE(FIRST_ELEMENT(anchor));
+        DECL_ANCHOR(anchor);
+        INIT_ANCHOR(anchor);
+        CHECK(COMPILE_POPPED(anchor, "masgn lhs", node));
+        ELEM_REMOVE(FIRST_ELEMENT(anchor));
         ADD_SEQ(lhs, anchor);
       }
     }
@@ -4922,15 +5863,15 @@ static int
 compile_massign_opt_lhs(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE *lhsn)
 {
     if (lhsn) {
-	CHECK(compile_massign_opt_lhs(iseq, ret, lhsn->nd_next));
-        CHECK(compile_massign_lhs(iseq, ret, ret, ret, ret, lhsn->nd_head, NULL, 0));
+        CHECK(compile_massign_opt_lhs(iseq, ret, RNODE_LIST(lhsn)->nd_next));
+        CHECK(compile_massign_lhs(iseq, ret, ret, ret, ret, RNODE_LIST(lhsn)->nd_head, NULL, 0));
     }
     return COMPILE_OK;
 }
 
 static int
 compile_massign_opt(rb_iseq_t *iseq, LINK_ANCHOR *const ret,
-		    const NODE *rhsn, const NODE *orig_lhsn)
+                    const NODE *rhsn, const NODE *orig_lhsn)
 {
     VALUE mem[64];
     const int memsize = numberof(mem);
@@ -4943,48 +5884,46 @@ compile_massign_opt(rb_iseq_t *iseq, LINK_ANCHOR *const ret,
     int i; \
     if (memindex == memsize) return 0; \
     for (i=0; i<memindex; i++) { \
-	if (mem[i] == (v)) return 0; \
+        if (mem[i] == (v)) return 0; \
     } \
     mem[memindex++] = (v); \
 }
 
     if (rhsn == 0 || !nd_type_p(rhsn, NODE_LIST)) {
-	return 0;
+        return 0;
     }
 
     while (lhsn) {
-	const NODE *ln = lhsn->nd_head;
-	switch (nd_type(ln)) {
-	  case NODE_LASGN:
-	    MEMORY(ln->nd_vid);
-	    break;
-	  case NODE_DASGN:
-	  case NODE_IASGN:
-	  case NODE_CVASGN:
-	    MEMORY(ln->nd_vid);
-	    break;
-	  default:
-	    return 0;
-	}
-	lhsn = lhsn->nd_next;
-	llen++;
+        const NODE *ln = RNODE_LIST(lhsn)->nd_head;
+        switch (nd_type(ln)) {
+          case NODE_LASGN:
+          case NODE_DASGN:
+          case NODE_IASGN:
+          case NODE_CVASGN:
+            MEMORY(get_nd_vid(ln));
+            break;
+          default:
+            return 0;
+        }
+        lhsn = RNODE_LIST(lhsn)->nd_next;
+        llen++;
     }
 
     while (rhsn) {
-	if (llen <= rlen) {
-            NO_CHECK(COMPILE_POPPED(ret, "masgn val (popped)", rhsn->nd_head));
-	}
-	else {
-            NO_CHECK(COMPILE(ret, "masgn val", rhsn->nd_head));
-	}
-	rhsn = rhsn->nd_next;
-	rlen++;
+        if (llen <= rlen) {
+            NO_CHECK(COMPILE_POPPED(ret, "masgn val (popped)", RNODE_LIST(rhsn)->nd_head));
+        }
+        else {
+            NO_CHECK(COMPILE(ret, "masgn val", RNODE_LIST(rhsn)->nd_head));
+        }
+        rhsn = RNODE_LIST(rhsn)->nd_next;
+        rlen++;
     }
 
     if (llen > rlen) {
-	for (i=0; i<llen-rlen; i++) {
-	    ADD_INSN(ret, orig_lhsn, putnil);
-	}
+        for (i=0; i<llen-rlen; i++) {
+            ADD_INSN(ret, orig_lhsn, putnil);
+        }
     }
 
     compile_massign_opt_lhs(iseq, ret, orig_lhsn);
@@ -4994,32 +5933,31 @@ compile_massign_opt(rb_iseq_t *iseq, LINK_ANCHOR *const ret,
 static int
 compile_massign0(rb_iseq_t *iseq, LINK_ANCHOR *const pre, LINK_ANCHOR *const rhs, LINK_ANCHOR *const lhs, LINK_ANCHOR *const post, const NODE *const node, struct masgn_state *state, int popped)
 {
-    const NODE *rhsn = node->nd_value;
-    const NODE *splatn = node->nd_args;
-    const NODE *lhsn = node->nd_head;
+    const NODE *rhsn = RNODE_MASGN(node)->nd_value;
+    const NODE *splatn = RNODE_MASGN(node)->nd_args;
+    const NODE *lhsn = RNODE_MASGN(node)->nd_head;
     const NODE *lhsn_count = lhsn;
     int lhs_splat = (splatn && NODE_NAMED_REST_P(splatn)) ? 1 : 0;
 
     int llen = 0;
     int lpos = 0;
-    int expand = 1;
 
     while (lhsn_count) {
         llen++;
-        lhsn_count = lhsn_count->nd_next;
+        lhsn_count = RNODE_LIST(lhsn_count)->nd_next;
     }
     while (lhsn) {
-        CHECK(compile_massign_lhs(iseq, pre, rhs, lhs, post, lhsn->nd_head, state, (llen - lpos) + lhs_splat + state->lhs_level));
+        CHECK(compile_massign_lhs(iseq, pre, rhs, lhs, post, RNODE_LIST(lhsn)->nd_head, state, (llen - lpos) + lhs_splat + state->lhs_level));
         lpos++;
-        lhsn = lhsn->nd_next;
+        lhsn = RNODE_LIST(lhsn)->nd_next;
     }
 
     if (lhs_splat) {
         if (nd_type_p(splatn, NODE_POSTARG)) {
             /*a, b, *r, p1, p2 */
-            const NODE *postn = splatn->nd_2nd;
-            const NODE *restn = splatn->nd_1st;
-            int plen = (int)postn->nd_alen;
+            const NODE *postn = RNODE_POSTARG(splatn)->nd_2nd;
+            const NODE *restn = RNODE_POSTARG(splatn)->nd_1st;
+            int plen = (int)RNODE_LIST(postn)->as.nd_alen;
             int ppos = 0;
             int flag = 0x02 | (NODE_NAMED_REST_P(restn) ? 0x01 : 0x00);
 
@@ -5029,9 +5967,9 @@ compile_massign0(rb_iseq_t *iseq, LINK_ANCHOR *const pre, LINK_ANCHOR *const rhs
                 CHECK(compile_massign_lhs(iseq, pre, rhs, lhs, post, restn, state, 1 + plen + state->lhs_level));
             }
             while (postn) {
-                CHECK(compile_massign_lhs(iseq, pre, rhs, lhs, post, postn->nd_head, state, (plen - ppos) + state->lhs_level));
+                CHECK(compile_massign_lhs(iseq, pre, rhs, lhs, post, RNODE_LIST(postn)->nd_head, state, (plen - ppos) + state->lhs_level));
                 ppos++;
-                postn = postn->nd_next;
+                postn = RNODE_LIST(postn)->nd_next;
             }
         }
         else {
@@ -5040,7 +5978,6 @@ compile_massign0(rb_iseq_t *iseq, LINK_ANCHOR *const pre, LINK_ANCHOR *const rhs
         }
     }
 
-
     if (!state->nested) {
         NO_CHECK(COMPILE(rhs, "normal masgn rhs", rhsn));
     }
@@ -5048,16 +5985,14 @@ compile_massign0(rb_iseq_t *iseq, LINK_ANCHOR *const pre, LINK_ANCHOR *const rhs
     if (!popped) {
         ADD_INSN(rhs, node, dup);
     }
-    if (expand) {
-        ADD_INSN2(rhs, node, expandarray, INT2FIX(llen), INT2FIX(lhs_splat));
-    }
+    ADD_INSN2(rhs, node, expandarray, INT2FIX(llen), INT2FIX(lhs_splat));
     return COMPILE_OK;
 }
 
 static int
 compile_massign(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE *const node, int popped)
 {
-    if (!popped || node->nd_args || !compile_massign_opt(iseq, ret, node->nd_value, node->nd_head)) {
+    if (!popped || RNODE_MASGN(node)->nd_args || !compile_massign_opt(iseq, ret, RNODE_MASGN(node)->nd_value, RNODE_MASGN(node)->nd_head)) {
         struct masgn_state state;
         state.lhs_level = popped ? 0 : 1;
         state.nested = 0;
@@ -5079,7 +6014,7 @@ compile_massign(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE *const node,
         while (memo) {
             VALUE topn_arg = INT2FIX((state.num_args - memo->argn) + memo->lhs_pos);
             for (int i = 0; i < memo->num_args; i++) {
-                INSERT_BEFORE_INSN1(memo->before_insn, memo->line_node, topn, topn_arg);
+                INSERT_BEFORE_INSN1(memo->before_insn, nd_line(memo->line_node), nd_node_id(memo->line_node), topn, topn_arg);
             }
             tmp_memo = memo->next;
             free(memo);
@@ -5099,32 +6034,57 @@ compile_massign(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE *const node,
     return COMPILE_OK;
 }
 
+static VALUE
+collect_const_segments(rb_iseq_t *iseq, const NODE *node)
+{
+    VALUE arr = rb_ary_new();
+    for (;;) {
+        switch (nd_type(node)) {
+          case NODE_CONST:
+            rb_ary_unshift(arr, ID2SYM(RNODE_CONST(node)->nd_vid));
+            RB_OBJ_SET_SHAREABLE(arr);
+            return arr;
+          case NODE_COLON3:
+            rb_ary_unshift(arr, ID2SYM(RNODE_COLON3(node)->nd_mid));
+            rb_ary_unshift(arr, ID2SYM(idNULL));
+            RB_OBJ_SET_SHAREABLE(arr);
+            return arr;
+          case NODE_COLON2:
+            rb_ary_unshift(arr, ID2SYM(RNODE_COLON2(node)->nd_mid));
+            node = RNODE_COLON2(node)->nd_head;
+            break;
+          default:
+            return Qfalse;
+        }
+    }
+}
+
 static int
 compile_const_prefix(rb_iseq_t *iseq, const NODE *const node,
-		     LINK_ANCHOR *const pref, LINK_ANCHOR *const body)
+                     LINK_ANCHOR *const pref, LINK_ANCHOR *const body)
 {
     switch (nd_type(node)) {
       case NODE_CONST:
-	debugi("compile_const_prefix - colon", node->nd_vid);
+        debugi("compile_const_prefix - colon", RNODE_CONST(node)->nd_vid);
         ADD_INSN1(body, node, putobject, Qtrue);
-        ADD_INSN1(body, node, getconstant, ID2SYM(node->nd_vid));
-	break;
+        ADD_INSN1(body, node, getconstant, ID2SYM(RNODE_CONST(node)->nd_vid));
+        break;
       case NODE_COLON3:
-	debugi("compile_const_prefix - colon3", node->nd_mid);
-	ADD_INSN(body, node, pop);
-	ADD_INSN1(body, node, putobject, rb_cObject);
+        debugi("compile_const_prefix - colon3", RNODE_COLON3(node)->nd_mid);
+        ADD_INSN(body, node, pop);
+        ADD_INSN1(body, node, putobject, rb_cObject);
         ADD_INSN1(body, node, putobject, Qtrue);
-        ADD_INSN1(body, node, getconstant, ID2SYM(node->nd_mid));
-	break;
+        ADD_INSN1(body, node, getconstant, ID2SYM(RNODE_COLON3(node)->nd_mid));
+        break;
       case NODE_COLON2:
-	CHECK(compile_const_prefix(iseq, node->nd_head, pref, body));
-	debugi("compile_const_prefix - colon2", node->nd_mid);
+        CHECK(compile_const_prefix(iseq, RNODE_COLON2(node)->nd_head, pref, body));
+        debugi("compile_const_prefix - colon2", RNODE_COLON2(node)->nd_mid);
         ADD_INSN1(body, node, putobject, Qfalse);
-        ADD_INSN1(body, node, getconstant, ID2SYM(node->nd_mid));
-	break;
+        ADD_INSN1(body, node, getconstant, ID2SYM(RNODE_COLON2(node)->nd_mid));
+        break;
       default:
-	CHECK(COMPILE(pref, "const colon2 prefix", node));
-	break;
+        CHECK(COMPILE(pref, "const colon2 prefix", node));
+        break;
     }
     return COMPILE_OK;
 }
@@ -5133,36 +6093,36 @@ static int
 compile_cpath(LINK_ANCHOR *const ret, rb_iseq_t *iseq, const NODE *cpath)
 {
     if (nd_type_p(cpath, NODE_COLON3)) {
-	/* toplevel class ::Foo */
-	ADD_INSN1(ret, cpath, putobject, rb_cObject);
-	return VM_DEFINECLASS_FLAG_SCOPED;
+        /* toplevel class ::Foo */
+        ADD_INSN1(ret, cpath, putobject, rb_cObject);
+        return VM_DEFINECLASS_FLAG_SCOPED;
     }
-    else if (cpath->nd_head) {
-	/* Bar::Foo */
-        NO_CHECK(COMPILE(ret, "nd_else->nd_head", cpath->nd_head));
-	return VM_DEFINECLASS_FLAG_SCOPED;
+    else if (nd_type_p(cpath, NODE_COLON2) && RNODE_COLON2(cpath)->nd_head) {
+        /* Bar::Foo */
+        NO_CHECK(COMPILE(ret, "nd_else->nd_head", RNODE_COLON2(cpath)->nd_head));
+        return VM_DEFINECLASS_FLAG_SCOPED;
     }
     else {
-	/* class at cbase Foo */
-	ADD_INSN1(ret, cpath, putspecialobject,
-		  INT2FIX(VM_SPECIAL_OBJECT_CONST_BASE));
-	return 0;
+        /* class at cbase Foo */
+        ADD_INSN1(ret, cpath, putspecialobject,
+                  INT2FIX(VM_SPECIAL_OBJECT_CONST_BASE));
+        return 0;
     }
 }
 
 static inline int
 private_recv_p(const NODE *node)
 {
-    if (nd_type_p(node->nd_recv, NODE_SELF)) {
-        NODE *self = node->nd_recv;
-        return self->nd_state != 0;
+    NODE *recv = get_nd_recv(node);
+    if (recv && nd_type_p(recv, NODE_SELF)) {
+        return RNODE_SELF(recv)->nd_state != 0;
     }
     return 0;
 }
 
 static void
 defined_expr(rb_iseq_t *iseq, LINK_ANCHOR *const ret,
-	     const NODE *const node, LABEL **lfinish, VALUE needstr);
+             const NODE *const node, LABEL **lfinish, VALUE needstr, bool ignore);
 
 static int
 compile_call(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE *const node, const enum node_type type, const NODE *const line_node, int popped, bool assume_receiver);
@@ -5179,106 +6139,127 @@ defined_expr0(rb_iseq_t *iseq, LINK_ANCHOR *const ret,
 
     switch (type = nd_type(node)) {
 
-	/* easy literals */
+        /* easy literals */
       case NODE_NIL:
-	expr_type = DEFINED_NIL;
-	break;
+        expr_type = DEFINED_NIL;
+        break;
       case NODE_SELF:
-	expr_type = DEFINED_SELF;
-	break;
+        expr_type = DEFINED_SELF;
+        break;
       case NODE_TRUE:
-	expr_type = DEFINED_TRUE;
-	break;
+        expr_type = DEFINED_TRUE;
+        break;
       case NODE_FALSE:
-	expr_type = DEFINED_FALSE;
-	break;
+        expr_type = DEFINED_FALSE;
+        break;
 
+      case NODE_HASH:
       case NODE_LIST:{
-	const NODE *vals = node;
+        const NODE *vals = (nd_type(node) == NODE_HASH) ? RNODE_HASH(node)->nd_head : node;
 
-	do {
-            defined_expr0(iseq, ret, vals->nd_head, lfinish, Qfalse, false);
+        if (vals) {
+            do {
+                if (RNODE_LIST(vals)->nd_head) {
+                    defined_expr0(iseq, ret, RNODE_LIST(vals)->nd_head, lfinish, Qfalse, false);
 
-	    if (!lfinish[1]) {
-                lfinish[1] = NEW_LABEL(line);
-	    }
-            ADD_INSNL(ret, line_node, branchunless, lfinish[1]);
-	} while ((vals = vals->nd_next) != NULL);
+                    if (!lfinish[1]) {
+                        lfinish[1] = NEW_LABEL(line);
+                    }
+                    ADD_INSNL(ret, line_node, branchunless, lfinish[1]);
+                }
+            } while ((vals = RNODE_LIST(vals)->nd_next) != NULL);
+        }
       }
         /* fall through */
       case NODE_STR:
-      case NODE_LIT:
+      case NODE_SYM:
+      case NODE_REGX:
+      case NODE_LINE:
+      case NODE_FILE:
+      case NODE_ENCODING:
+      case NODE_INTEGER:
+      case NODE_FLOAT:
+      case NODE_RATIONAL:
+      case NODE_IMAGINARY:
       case NODE_ZLIST:
       case NODE_AND:
       case NODE_OR:
       default:
-	expr_type = DEFINED_EXPR;
-	break;
+        expr_type = DEFINED_EXPR;
+        break;
 
-	/* variables */
+      case NODE_SPLAT:
+        defined_expr0(iseq, ret, RNODE_LIST(node)->nd_head, lfinish, Qfalse, false);
+        if (!lfinish[1]) {
+            lfinish[1] = NEW_LABEL(line);
+        }
+        ADD_INSNL(ret, line_node, branchunless, lfinish[1]);
+        expr_type = DEFINED_EXPR;
+        break;
+
+        /* variables */
       case NODE_LVAR:
       case NODE_DVAR:
-	expr_type = DEFINED_LVAR;
-	break;
+        expr_type = DEFINED_LVAR;
+        break;
 
 #define PUSH_VAL(type) (needstr == Qfalse ? Qtrue : rb_iseq_defined_string(type))
       case NODE_IVAR:
-        ADD_INSN(ret, line_node, putnil);
-        ADD_INSN3(ret, line_node, defined, INT2FIX(DEFINED_IVAR),
-		  ID2SYM(node->nd_vid), PUSH_VAL(DEFINED_IVAR));
+        ADD_INSN3(ret, line_node, definedivar,
+                  ID2SYM(RNODE_IVAR(node)->nd_vid), get_ivar_ic_value(iseq,RNODE_IVAR(node)->nd_vid), PUSH_VAL(DEFINED_IVAR));
         return;
 
       case NODE_GVAR:
         ADD_INSN(ret, line_node, putnil);
         ADD_INSN3(ret, line_node, defined, INT2FIX(DEFINED_GVAR),
-		  ID2SYM(node->nd_entry), PUSH_VAL(DEFINED_GVAR));
+                  ID2SYM(RNODE_GVAR(node)->nd_vid), PUSH_VAL(DEFINED_GVAR));
         return;
 
       case NODE_CVAR:
         ADD_INSN(ret, line_node, putnil);
         ADD_INSN3(ret, line_node, defined, INT2FIX(DEFINED_CVAR),
-		  ID2SYM(node->nd_vid), PUSH_VAL(DEFINED_CVAR));
+                  ID2SYM(RNODE_CVAR(node)->nd_vid), PUSH_VAL(DEFINED_CVAR));
         return;
 
       case NODE_CONST:
         ADD_INSN(ret, line_node, putnil);
         ADD_INSN3(ret, line_node, defined, INT2FIX(DEFINED_CONST),
-		  ID2SYM(node->nd_vid), PUSH_VAL(DEFINED_CONST));
+                  ID2SYM(RNODE_CONST(node)->nd_vid), PUSH_VAL(DEFINED_CONST));
         return;
       case NODE_COLON2:
-	if (!lfinish[1]) {
+        if (!lfinish[1]) {
             lfinish[1] = NEW_LABEL(line);
-	}
-        defined_expr0(iseq, ret, node->nd_head, lfinish, Qfalse, false);
+        }
+        defined_expr0(iseq, ret, RNODE_COLON2(node)->nd_head, lfinish, Qfalse, false);
         ADD_INSNL(ret, line_node, branchunless, lfinish[1]);
-        NO_CHECK(COMPILE(ret, "defined/colon2#nd_head", node->nd_head));
+        NO_CHECK(COMPILE(ret, "defined/colon2#nd_head", RNODE_COLON2(node)->nd_head));
 
-        if (rb_is_const_id(node->nd_mid)) {
+        if (rb_is_const_id(RNODE_COLON2(node)->nd_mid)) {
             ADD_INSN3(ret, line_node, defined, INT2FIX(DEFINED_CONST_FROM),
-                    ID2SYM(node->nd_mid), PUSH_VAL(DEFINED_CONST));
+                    ID2SYM(RNODE_COLON2(node)->nd_mid), PUSH_VAL(DEFINED_CONST));
         }
         else {
             ADD_INSN3(ret, line_node, defined, INT2FIX(DEFINED_METHOD),
-                    ID2SYM(node->nd_mid), PUSH_VAL(DEFINED_METHOD));
+                    ID2SYM(RNODE_COLON2(node)->nd_mid), PUSH_VAL(DEFINED_METHOD));
         }
         return;
       case NODE_COLON3:
         ADD_INSN1(ret, line_node, putobject, rb_cObject);
         ADD_INSN3(ret, line_node, defined,
-		  INT2FIX(DEFINED_CONST_FROM), ID2SYM(node->nd_mid), PUSH_VAL(DEFINED_CONST));
+                  INT2FIX(DEFINED_CONST_FROM), ID2SYM(RNODE_COLON3(node)->nd_mid), PUSH_VAL(DEFINED_CONST));
         return;
 
-	/* method dispatch */
+        /* method dispatch */
       case NODE_CALL:
       case NODE_OPCALL:
       case NODE_VCALL:
       case NODE_FCALL:
       case NODE_ATTRASGN:{
-	const int explicit_receiver =
-	    (type == NODE_CALL || type == NODE_OPCALL ||
-	     (type == NODE_ATTRASGN && !private_recv_p(node)));
+        const int explicit_receiver =
+            (type == NODE_CALL || type == NODE_OPCALL ||
+             (type == NODE_ATTRASGN && !private_recv_p(node)));
 
-        if (node->nd_args || explicit_receiver) {
+        if (get_nd_args(node) || explicit_receiver) {
             if (!lfinish[1]) {
                 lfinish[1] = NEW_LABEL(line);
             }
@@ -5286,62 +6267,63 @@ defined_expr0(rb_iseq_t *iseq, LINK_ANCHOR *const ret,
                 lfinish[2] = NEW_LABEL(line);
             }
         }
-	if (node->nd_args) {
-            defined_expr0(iseq, ret, node->nd_args, lfinish, Qfalse, false);
+        if (get_nd_args(node)) {
+            defined_expr0(iseq, ret, get_nd_args(node), lfinish, Qfalse, false);
             ADD_INSNL(ret, line_node, branchunless, lfinish[1]);
-	}
-	if (explicit_receiver) {
-            defined_expr0(iseq, ret, node->nd_recv, lfinish, Qfalse, true);
-            switch (nd_type(node->nd_recv)) {
+        }
+        if (explicit_receiver) {
+            defined_expr0(iseq, ret, get_nd_recv(node), lfinish, Qfalse, true);
+            switch (nd_type(get_nd_recv(node))) {
               case NODE_CALL:
               case NODE_OPCALL:
               case NODE_VCALL:
               case NODE_FCALL:
               case NODE_ATTRASGN:
                 ADD_INSNL(ret, line_node, branchunless, lfinish[2]);
-                compile_call(iseq, ret, node->nd_recv, nd_type(node->nd_recv), line_node, 0, true);
+                compile_call(iseq, ret, get_nd_recv(node), nd_type(get_nd_recv(node)), line_node, 0, true);
                 break;
               default:
                 ADD_INSNL(ret, line_node, branchunless, lfinish[1]);
-                NO_CHECK(COMPILE(ret, "defined/recv", node->nd_recv));
+                NO_CHECK(COMPILE(ret, "defined/recv", get_nd_recv(node)));
                 break;
             }
             if (keep_result) {
                 ADD_INSN(ret, line_node, dup);
             }
             ADD_INSN3(ret, line_node, defined, INT2FIX(DEFINED_METHOD),
-		      ID2SYM(node->nd_mid), PUSH_VAL(DEFINED_METHOD));
-	}
-	else {
+                      ID2SYM(get_node_call_nd_mid(node)), PUSH_VAL(DEFINED_METHOD));
+        }
+        else {
             ADD_INSN(ret, line_node, putself);
             if (keep_result) {
                 ADD_INSN(ret, line_node, dup);
             }
             ADD_INSN3(ret, line_node, defined, INT2FIX(DEFINED_FUNC),
-		      ID2SYM(node->nd_mid), PUSH_VAL(DEFINED_METHOD));
-	}
+                      ID2SYM(get_node_call_nd_mid(node)), PUSH_VAL(DEFINED_METHOD));
+        }
         return;
       }
 
       case NODE_YIELD:
         ADD_INSN(ret, line_node, putnil);
         ADD_INSN3(ret, line_node, defined, INT2FIX(DEFINED_YIELD), 0,
-		  PUSH_VAL(DEFINED_YIELD));
+                  PUSH_VAL(DEFINED_YIELD));
+        iseq_set_use_block(ISEQ_BODY(iseq)->local_iseq);
         return;
 
       case NODE_BACK_REF:
       case NODE_NTH_REF:
         ADD_INSN(ret, line_node, putnil);
         ADD_INSN3(ret, line_node, defined, INT2FIX(DEFINED_REF),
-		  INT2FIX((node->nd_nth << 1) | (type == NODE_BACK_REF)),
-		  PUSH_VAL(DEFINED_GVAR));
+                  INT2FIX((RNODE_BACK_REF(node)->nd_nth << 1) | (type == NODE_BACK_REF)),
+                  PUSH_VAL(DEFINED_GVAR));
         return;
 
       case NODE_SUPER:
       case NODE_ZSUPER:
         ADD_INSN(ret, line_node, putnil);
         ADD_INSN3(ret, line_node, defined, INT2FIX(DEFINED_ZSUPER), 0,
-		  PUSH_VAL(DEFINED_ZSUPER));
+                  PUSH_VAL(DEFINED_ZSUPER));
         return;
 
 #undef PUSH_VAL
@@ -5356,11 +6338,12 @@ defined_expr0(rb_iseq_t *iseq, LINK_ANCHOR *const ret,
       case NODE_IASGN:
       case NODE_CDECL:
       case NODE_CVASGN:
-	expr_type = DEFINED_ASGN;
-	break;
+      case NODE_OP_CDECL:
+        expr_type = DEFINED_ASGN;
+        break;
     }
 
-    assert(expr_type != DEFINED_NOT_DEFINED);
+    RUBY_ASSERT(expr_type != DEFINED_NOT_DEFINED);
 
     if (needstr != Qfalse) {
         VALUE str = rb_iseq_defined_string(expr_type);
@@ -5374,62 +6357,63 @@ defined_expr0(rb_iseq_t *iseq, LINK_ANCHOR *const ret,
 static void
 build_defined_rescue_iseq(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const void *unused)
 {
-    NODE dummy_line_node = generate_dummy_line_node(0, -1);
-    ADD_INSN(ret, &dummy_line_node, putnil);
+    ADD_SYNTHETIC_INSN(ret, 0, -1, putnil);
     iseq_set_exception_local_table(iseq);
 }
 
 static void
 defined_expr(rb_iseq_t *iseq, LINK_ANCHOR *const ret,
-	     const NODE *const node, LABEL **lfinish, VALUE needstr)
+             const NODE *const node, LABEL **lfinish, VALUE needstr, bool ignore)
 {
     LINK_ELEMENT *lcur = ret->last;
     defined_expr0(iseq, ret, node, lfinish, needstr, false);
     if (lfinish[1]) {
-	int line = nd_line(node);
-	LABEL *lstart = NEW_LABEL(line);
-	LABEL *lend = NEW_LABEL(line);
-	const rb_iseq_t *rescue;
+        int line = nd_line(node);
+        LABEL *lstart = NEW_LABEL(line);
+        LABEL *lend = NEW_LABEL(line);
+        const rb_iseq_t *rescue;
         struct rb_iseq_new_with_callback_callback_func *ifunc =
             rb_iseq_new_with_callback_new_callback(build_defined_rescue_iseq, NULL);
-        rescue = new_child_iseq_with_callback(iseq, ifunc,
+        rescue = NEW_CHILD_ISEQ_WITH_CALLBACK(ifunc,
                                               rb_str_concat(rb_str_new2("defined guard in "),
                                                             ISEQ_BODY(iseq)->location.label),
-                                              iseq, ISEQ_TYPE_RESCUE, 0);
-	lstart->rescued = LABEL_RESCUE_BEG;
-	lend->rescued = LABEL_RESCUE_END;
-	APPEND_LABEL(ret, lcur, lstart);
-	ADD_LABEL(ret, lend);
-	ADD_CATCH_ENTRY(CATCH_TYPE_RESCUE, lstart, lend, rescue, lfinish[1]);
+                                              ISEQ_TYPE_RESCUE, 0);
+        lstart->rescued = LABEL_RESCUE_BEG;
+        lend->rescued = LABEL_RESCUE_END;
+        APPEND_LABEL(ret, lcur, lstart);
+        ADD_LABEL(ret, lend);
+        if (!ignore) {
+            ADD_CATCH_ENTRY(CATCH_TYPE_RESCUE, lstart, lend, rescue, lfinish[1]);
+        }
     }
 }
 
 static int
-compile_defined_expr(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE *const node, VALUE needstr)
+compile_defined_expr(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE *const node, VALUE needstr, bool ignore)
 {
     const int line = nd_line(node);
     const NODE *line_node = node;
-    if (!node->nd_head) {
-	VALUE str = rb_iseq_defined_string(DEFINED_NIL);
-	ADD_INSN1(ret, line_node, putobject, str);
+    if (!RNODE_DEFINED(node)->nd_head) {
+        VALUE str = rb_iseq_defined_string(DEFINED_NIL);
+        ADD_INSN1(ret, line_node, putobject, str);
     }
     else {
         LABEL *lfinish[3];
-	LINK_ELEMENT *last = ret->last;
-	lfinish[0] = NEW_LABEL(line);
-	lfinish[1] = 0;
+        LINK_ELEMENT *last = ret->last;
+        lfinish[0] = NEW_LABEL(line);
+        lfinish[1] = 0;
         lfinish[2] = 0;
-	defined_expr(iseq, ret, node->nd_head, lfinish, needstr);
-	if (lfinish[1]) {
-	    ELEM_INSERT_NEXT(last, &new_insn_body(iseq, line_node, BIN(putnil), 0)->link);
-	    ADD_INSN(ret, line_node, swap);
+        defined_expr(iseq, ret, RNODE_DEFINED(node)->nd_head, lfinish, needstr, ignore);
+        if (lfinish[1]) {
+            ELEM_INSERT_NEXT(last, &new_insn_body(iseq, nd_line(line_node), nd_node_id(line_node), BIN(putnil), 0)->link);
+            ADD_INSN(ret, line_node, swap);
             if (lfinish[2]) {
                 ADD_LABEL(ret, lfinish[2]);
             }
-	    ADD_INSN(ret, line_node, pop);
-	    ADD_LABEL(ret, lfinish[1]);
-	}
-	ADD_LABEL(ret, lfinish[0]);
+            ADD_INSN(ret, line_node, pop);
+            ADD_LABEL(ret, lfinish[1]);
+        }
+        ADD_LABEL(ret, lfinish[0]);
     }
     return COMPILE_OK;
 }
@@ -5443,10 +6427,10 @@ make_name_for_block(const rb_iseq_t *orig_iseq)
     if (ISEQ_BODY(orig_iseq)->parent_iseq != 0) {
         while (ISEQ_BODY(orig_iseq)->local_iseq != iseq) {
             if (ISEQ_BODY(iseq)->type == ISEQ_TYPE_BLOCK) {
-		level++;
-	    }
+                level++;
+            }
             iseq = ISEQ_BODY(iseq)->parent_iseq;
-	}
+        }
     }
 
     if (level == 1) {
@@ -5459,8 +6443,8 @@ make_name_for_block(const rb_iseq_t *orig_iseq)
 
 static void
 push_ensure_entry(rb_iseq_t *iseq,
-		  struct iseq_compile_data_ensure_node_stack *enl,
-		  struct ensure_range *er, const NODE *const node)
+                  struct iseq_compile_data_ensure_node_stack *enl,
+                  struct ensure_range *er, const void *const node)
 {
     enl->ensure_node = node;
     enl->prev = ISEQ_COMPILE_DATA(iseq)->ensure_node_stack;	/* prev */
@@ -5470,13 +6454,13 @@ push_ensure_entry(rb_iseq_t *iseq,
 
 static void
 add_ensure_range(rb_iseq_t *iseq, struct ensure_range *erange,
-		 LABEL *lstart, LABEL *lend)
+                 LABEL *lstart, LABEL *lend)
 {
     struct ensure_range *ne =
-	compile_data_alloc(iseq, sizeof(struct ensure_range));
+        compile_data_alloc(iseq, sizeof(struct ensure_range));
 
     while (erange->next != 0) {
-	erange = erange->next;
+        erange = erange->next;
     }
     ne->next = 0;
     ne->begin = lend;
@@ -5502,127 +6486,342 @@ can_add_ensure_iseq(const rb_iseq_t *iseq)
 static void
 add_ensure_iseq(LINK_ANCHOR *const ret, rb_iseq_t *iseq, int is_return)
 {
-    assert(can_add_ensure_iseq(iseq));
+    RUBY_ASSERT(can_add_ensure_iseq(iseq));
 
     struct iseq_compile_data_ensure_node_stack *enlp =
-	ISEQ_COMPILE_DATA(iseq)->ensure_node_stack;
+        ISEQ_COMPILE_DATA(iseq)->ensure_node_stack;
     struct iseq_compile_data_ensure_node_stack *prev_enlp = enlp;
     DECL_ANCHOR(ensure);
 
     INIT_ANCHOR(ensure);
     while (enlp) {
-	if (enlp->erange != NULL) {
-	    DECL_ANCHOR(ensure_part);
-	    LABEL *lstart = NEW_LABEL(0);
-	    LABEL *lend = NEW_LABEL(0);
-	    INIT_ANCHOR(ensure_part);
+        if (enlp->erange != NULL) {
+            DECL_ANCHOR(ensure_part);
+            LABEL *lstart = NEW_LABEL(0);
+            LABEL *lend = NEW_LABEL(0);
+            INIT_ANCHOR(ensure_part);
 
-	    add_ensure_range(iseq, enlp->erange, lstart, lend);
+            add_ensure_range(iseq, enlp->erange, lstart, lend);
 
-	    ISEQ_COMPILE_DATA(iseq)->ensure_node_stack = enlp->prev;
-	    ADD_LABEL(ensure_part, lstart);
+            ISEQ_COMPILE_DATA(iseq)->ensure_node_stack = enlp->prev;
+            ADD_LABEL(ensure_part, lstart);
             NO_CHECK(COMPILE_POPPED(ensure_part, "ensure part", enlp->ensure_node));
-	    ADD_LABEL(ensure_part, lend);
-	    ADD_SEQ(ensure, ensure_part);
-	}
-	else {
-	    if (!is_return) {
-		break;
-	    }
-	}
-	enlp = enlp->prev;
+            ADD_LABEL(ensure_part, lend);
+            ADD_SEQ(ensure, ensure_part);
+        }
+        else {
+            if (!is_return) {
+                break;
+            }
+        }
+        enlp = enlp->prev;
     }
     ISEQ_COMPILE_DATA(iseq)->ensure_node_stack = prev_enlp;
     ADD_SEQ(ret, ensure);
 }
 
+#if RUBY_DEBUG
 static int
 check_keyword(const NODE *node)
 {
     /* This check is essentially a code clone of compile_keyword_arg. */
 
     if (nd_type_p(node, NODE_LIST)) {
-        while (node->nd_next) {
-            node = node->nd_next;
+        while (RNODE_LIST(node)->nd_next) {
+            node = RNODE_LIST(node)->nd_next;
         }
-        node = node->nd_head;
+        node = RNODE_LIST(node)->nd_head;
     }
 
     return keyword_node_p(node);
 }
+#endif
 
-static VALUE
+static bool
+keyword_node_single_splat_p(NODE *kwnode)
+{
+    RUBY_ASSERT(keyword_node_p(kwnode));
+
+    NODE *node = RNODE_HASH(kwnode)->nd_head;
+    return RNODE_LIST(node)->nd_head == NULL &&
+           RNODE_LIST(RNODE_LIST(node)->nd_next)->nd_next == NULL;
+}
+
+static void
+compile_single_keyword_splat_mutable(rb_iseq_t *iseq, LINK_ANCHOR *const args, const NODE *argn,
+                                     NODE *kwnode, unsigned int *flag_ptr)
+{
+    *flag_ptr |= VM_CALL_KW_SPLAT_MUT;
+    ADD_INSN1(args, argn, putspecialobject, INT2FIX(VM_SPECIAL_OBJECT_VMCORE));
+    ADD_INSN1(args, argn, newhash, INT2FIX(0));
+    compile_hash(iseq, args, kwnode, TRUE, FALSE);
+    ADD_SEND(args, argn, id_core_hash_merge_kwd, INT2FIX(2));
+}
+
+#define SPLATARRAY_FALSE 0
+#define SPLATARRAY_TRUE 1
+#define DUP_SINGLE_KW_SPLAT 2
+
+static int
 setup_args_core(rb_iseq_t *iseq, LINK_ANCHOR *const args, const NODE *argn,
-                int dup_rest, unsigned int *flag, struct rb_callinfo_kwarg **keywords)
+                unsigned int *dup_rest, unsigned int *flag_ptr, struct rb_callinfo_kwarg **kwarg_ptr)
 {
-    if (argn) {
-        switch (nd_type(argn)) {
-          case NODE_SPLAT: {
-            NO_CHECK(COMPILE(args, "args (splat)", argn->nd_head));
-            ADD_INSN1(args, argn, splatarray, RBOOL(dup_rest));
-            if (flag) *flag |= VM_CALL_ARGS_SPLAT;
-            return INT2FIX(1);
-          }
-          case NODE_ARGSCAT:
-          case NODE_ARGSPUSH: {
-            int next_is_list = (nd_type_p(argn->nd_head, NODE_LIST));
-            VALUE argc = setup_args_core(iseq, args, argn->nd_head, 1, NULL, NULL);
-            if (nd_type_p(argn->nd_body, NODE_LIST)) {
-                /* This branch is needed to avoid "newarraykwsplat" [Bug #16442] */
-                int rest_len = compile_args(iseq, args, argn->nd_body, NULL, NULL);
-                ADD_INSN1(args, argn, newarray, INT2FIX(rest_len));
+    if (!argn) return 0;
+
+    NODE *kwnode = NULL;
+
+    switch (nd_type(argn)) {
+      case NODE_LIST: {
+        // f(x, y, z)
+        int len = compile_args(iseq, args, argn, &kwnode);
+        RUBY_ASSERT(flag_ptr == NULL || (*flag_ptr & VM_CALL_ARGS_SPLAT) == 0);
+
+        if (kwnode) {
+            if (compile_keyword_arg(iseq, args, kwnode, kwarg_ptr, flag_ptr)) {
+                len -= 1;
             }
             else {
-                NO_CHECK(COMPILE(args, "args (cat: splat)", argn->nd_body));
-            }
-            if (flag) {
-                *flag |= VM_CALL_ARGS_SPLAT;
-                /* This is a dirty hack.  It traverses the AST twice.
-                 * In a long term, it should be fixed by a redesign of keyword arguments */
-                if (check_keyword(argn->nd_body))
-                    *flag |= VM_CALL_KW_SPLAT;
-            }
-            if (nd_type_p(argn, NODE_ARGSCAT)) {
-                if (next_is_list) {
-                    ADD_INSN1(args, argn, splatarray, Qtrue);
-                    return INT2FIX(FIX2INT(argc) + 1);
+                if (keyword_node_single_splat_p(kwnode) && (*dup_rest & DUP_SINGLE_KW_SPLAT)) {
+                    compile_single_keyword_splat_mutable(iseq, args, argn, kwnode, flag_ptr);
                 }
                 else {
-                    ADD_INSN1(args, argn, splatarray, Qfalse);
-                    ADD_INSN(args, argn, concatarray);
-                    return argc;
+                    compile_hash(iseq, args, kwnode, TRUE, FALSE);
                 }
             }
+        }
+
+        return len;
+      }
+      case NODE_SPLAT: {
+        // f(*a)
+        NO_CHECK(COMPILE(args, "args (splat)", RNODE_SPLAT(argn)->nd_head));
+        ADD_INSN1(args, argn, splatarray, RBOOL(*dup_rest & SPLATARRAY_TRUE));
+        if (*dup_rest & SPLATARRAY_TRUE) *dup_rest &= ~SPLATARRAY_TRUE;
+        if (flag_ptr) *flag_ptr |= VM_CALL_ARGS_SPLAT;
+        RUBY_ASSERT(flag_ptr == NULL || (*flag_ptr & VM_CALL_KW_SPLAT) == 0);
+        return 1;
+      }
+      case NODE_ARGSCAT: {
+        if (flag_ptr) *flag_ptr |= VM_CALL_ARGS_SPLAT;
+        int argc = setup_args_core(iseq, args, RNODE_ARGSCAT(argn)->nd_head, dup_rest, NULL, NULL);
+        bool args_pushed = false;
+
+        if (nd_type_p(RNODE_ARGSCAT(argn)->nd_body, NODE_LIST)) {
+            int rest_len = compile_args(iseq, args, RNODE_ARGSCAT(argn)->nd_body, &kwnode);
+            if (kwnode) rest_len--;
+            ADD_INSN1(args, argn, pushtoarray, INT2FIX(rest_len));
+            args_pushed = true;
+        }
+        else {
+            RUBY_ASSERT(!check_keyword(RNODE_ARGSCAT(argn)->nd_body));
+            NO_CHECK(COMPILE(args, "args (cat: splat)", RNODE_ARGSCAT(argn)->nd_body));
+        }
+
+        if (nd_type_p(RNODE_ARGSCAT(argn)->nd_head, NODE_LIST)) {
+            ADD_INSN1(args, argn, splatarray, RBOOL(*dup_rest & SPLATARRAY_TRUE));
+            if (*dup_rest & SPLATARRAY_TRUE) *dup_rest &= ~SPLATARRAY_TRUE;
+            argc += 1;
+        }
+        else if (!args_pushed) {
+            ADD_INSN(args, argn, concattoarray);
+        }
+
+        // f(..., *a, ..., k1:1, ...) #=> f(..., *[*a, ...], **{k1:1, ...})
+        if (kwnode) {
+            // kwsplat
+            *flag_ptr |= VM_CALL_KW_SPLAT;
+            compile_hash(iseq, args, kwnode, TRUE, FALSE);
+            argc += 1;
+        }
+
+        return argc;
+      }
+      case NODE_ARGSPUSH: {
+        if (flag_ptr) *flag_ptr |= VM_CALL_ARGS_SPLAT;
+        int argc = setup_args_core(iseq, args, RNODE_ARGSPUSH(argn)->nd_head, dup_rest, NULL, NULL);
+
+        if (nd_type_p(RNODE_ARGSPUSH(argn)->nd_body, NODE_LIST)) {
+            int rest_len = compile_args(iseq, args, RNODE_ARGSPUSH(argn)->nd_body, &kwnode);
+            if (kwnode) rest_len--;
+            ADD_INSN1(args, argn, newarray, INT2FIX(rest_len));
+            ADD_INSN1(args, argn, pushtoarray, INT2FIX(1));
+        }
+        else {
+            if (keyword_node_p(RNODE_ARGSPUSH(argn)->nd_body)) {
+                kwnode = RNODE_ARGSPUSH(argn)->nd_body;
+            }
             else {
-                ADD_INSN1(args, argn, newarray, INT2FIX(1));
-                ADD_INSN(args, argn, concatarray);
-                return argc;
+                NO_CHECK(COMPILE(args, "args (cat: splat)", RNODE_ARGSPUSH(argn)->nd_body));
+                ADD_INSN1(args, argn, pushtoarray, INT2FIX(1));
             }
-          }
-          case NODE_LIST: {
-            int len = compile_args(iseq, args, argn, keywords, flag);
-            return INT2FIX(len);
-          }
-          default: {
-            UNKNOWN_NODE("setup_arg", argn, Qnil);
-          }
         }
+
+        if (kwnode) {
+            // f(*a, k:1)
+            *flag_ptr |= VM_CALL_KW_SPLAT;
+            if (!keyword_node_single_splat_p(kwnode)) {
+                *flag_ptr |= VM_CALL_KW_SPLAT_MUT;
+                compile_hash(iseq, args, kwnode, TRUE, FALSE);
+            }
+            else if (*dup_rest & DUP_SINGLE_KW_SPLAT) {
+                compile_single_keyword_splat_mutable(iseq, args, argn, kwnode, flag_ptr);
+            }
+            else {
+                compile_hash(iseq, args, kwnode, TRUE, FALSE);
+            }
+            argc += 1;
+        }
+
+        return argc;
+      }
+      default: {
+        UNKNOWN_NODE("setup_arg", argn, Qnil);
+      }
+    }
+}
+
+static void
+setup_args_splat_mut(unsigned int *flag, int dup_rest, int initial_dup_rest)
+{
+    if ((*flag & VM_CALL_ARGS_SPLAT) && dup_rest != initial_dup_rest) {
+        *flag |= VM_CALL_ARGS_SPLAT_MUT;
+    }
+}
+
+static bool
+setup_args_dup_rest_p(const NODE *argn)
+{
+    switch(nd_type(argn)) {
+      case NODE_LVAR:
+      case NODE_DVAR:
+      case NODE_GVAR:
+      case NODE_IVAR:
+      case NODE_CVAR:
+      case NODE_CONST:
+      case NODE_COLON3:
+      case NODE_INTEGER:
+      case NODE_FLOAT:
+      case NODE_RATIONAL:
+      case NODE_IMAGINARY:
+      case NODE_STR:
+      case NODE_SYM:
+      case NODE_REGX:
+      case NODE_SELF:
+      case NODE_NIL:
+      case NODE_TRUE:
+      case NODE_FALSE:
+      case NODE_LAMBDA:
+      case NODE_NTH_REF:
+      case NODE_BACK_REF:
+        return false;
+      case NODE_COLON2:
+        return setup_args_dup_rest_p(RNODE_COLON2(argn)->nd_head);
+      case NODE_LIST:
+        while (argn) {
+            if (setup_args_dup_rest_p(RNODE_LIST(argn)->nd_head)) {
+                return true;
+            }
+            argn = RNODE_LIST(argn)->nd_next;
+        }
+        return false;
+      default:
+        return true;
     }
-    return INT2FIX(0);
 }
 
 static VALUE
 setup_args(rb_iseq_t *iseq, LINK_ANCHOR *const args, const NODE *argn,
-	   unsigned int *flag, struct rb_callinfo_kwarg **keywords)
+           unsigned int *flag, struct rb_callinfo_kwarg **keywords)
 {
     VALUE ret;
+    unsigned int dup_rest = SPLATARRAY_TRUE, initial_dup_rest;
+
+    if (argn) {
+        const NODE *check_arg = nd_type_p(argn, NODE_BLOCK_PASS) ?
+            RNODE_BLOCK_PASS(argn)->nd_head : argn;
+
+        if (check_arg) {
+            switch(nd_type(check_arg)) {
+              case(NODE_SPLAT):
+                // avoid caller side array allocation for f(*arg)
+                dup_rest = SPLATARRAY_FALSE;
+                break;
+              case(NODE_ARGSCAT):
+                // avoid caller side array allocation for f(1, *arg)
+                dup_rest = !nd_type_p(RNODE_ARGSCAT(check_arg)->nd_head, NODE_LIST);
+                break;
+              case(NODE_ARGSPUSH):
+                // avoid caller side array allocation for f(*arg, **hash) and f(1, *arg, **hash)
+                dup_rest = !((nd_type_p(RNODE_ARGSPUSH(check_arg)->nd_head, NODE_SPLAT) ||
+                    (nd_type_p(RNODE_ARGSPUSH(check_arg)->nd_head, NODE_ARGSCAT) &&
+                     nd_type_p(RNODE_ARGSCAT(RNODE_ARGSPUSH(check_arg)->nd_head)->nd_head, NODE_LIST))) &&
+                    nd_type_p(RNODE_ARGSPUSH(check_arg)->nd_body, NODE_HASH) &&
+                    !RNODE_HASH(RNODE_ARGSPUSH(check_arg)->nd_body)->nd_brace);
+
+                if (dup_rest == SPLATARRAY_FALSE) {
+                    // require allocation for keyword key/value/splat that may modify splatted argument
+                    NODE *node = RNODE_HASH(RNODE_ARGSPUSH(check_arg)->nd_body)->nd_head;
+                    while (node) {
+                        NODE *key_node = RNODE_LIST(node)->nd_head;
+                        if (key_node && setup_args_dup_rest_p(key_node)) {
+                            dup_rest = SPLATARRAY_TRUE;
+                            break;
+                        }
+
+                        node = RNODE_LIST(node)->nd_next;
+                        NODE *value_node = RNODE_LIST(node)->nd_head;
+                        if (setup_args_dup_rest_p(value_node)) {
+                            dup_rest = SPLATARRAY_TRUE;
+                            break;
+                        }
+
+                        node = RNODE_LIST(node)->nd_next;
+                    }
+                }
+                break;
+              default:
+                break;
+            }
+        }
+
+        if (check_arg != argn && setup_args_dup_rest_p(RNODE_BLOCK_PASS(argn)->nd_body)) {
+            // for block pass that may modify splatted argument, dup rest and kwrest if given
+            dup_rest = SPLATARRAY_TRUE | DUP_SINGLE_KW_SPLAT;
+        }
+    }
+    initial_dup_rest = dup_rest;
+
     if (argn && nd_type_p(argn, NODE_BLOCK_PASS)) {
-        unsigned int dup_rest = 1;
         DECL_ANCHOR(arg_block);
         INIT_ANCHOR(arg_block);
-        NO_CHECK(COMPILE(arg_block, "block", argn->nd_body));
 
-        *flag |= VM_CALL_ARGS_BLOCKARG;
+        if (RNODE_BLOCK_PASS(argn)->forwarding && ISEQ_BODY(ISEQ_BODY(iseq)->local_iseq)->param.flags.forwardable) {
+            int idx = ISEQ_BODY(ISEQ_BODY(iseq)->local_iseq)->local_table_size;// - get_local_var_idx(iseq, idDot3);
+
+            RUBY_ASSERT(nd_type_p(RNODE_BLOCK_PASS(argn)->nd_head, NODE_ARGSPUSH));
+            const NODE * arg_node =
+                RNODE_ARGSPUSH(RNODE_BLOCK_PASS(argn)->nd_head)->nd_head;
+
+            int argc = 0;
+
+            // Only compile leading args:
+            //   foo(x, y, ...)
+            //       ^^^^
+            if (nd_type_p(arg_node, NODE_ARGSCAT)) {
+                argc += setup_args_core(iseq, args, RNODE_ARGSCAT(arg_node)->nd_head, &dup_rest, flag, keywords);
+            }
+
+            *flag |= VM_CALL_FORWARDING;
+
+            ADD_GETLOCAL(args, argn, idx, get_lvar_level(iseq));
+            setup_args_splat_mut(flag, dup_rest, initial_dup_rest);
+            return INT2FIX(argc);
+        }
+        else {
+            *flag |= VM_CALL_ARGS_BLOCKARG;
+
+            NO_CHECK(COMPILE(arg_block, "block", RNODE_BLOCK_PASS(argn)->nd_body));
+        }
 
         if (LIST_INSN_SIZE_ONE(arg_block)) {
             LINK_ELEMENT *elem = FIRST_ELEMENT(arg_block);
@@ -5631,15 +6830,15 @@ setup_args(rb_iseq_t *iseq, LINK_ANCHOR *const args, const NODE *argn,
                 if (iobj->insn_id == BIN(getblockparam)) {
                     iobj->insn_id = BIN(getblockparamproxy);
                 }
-                dup_rest = 0;
             }
         }
-        ret = setup_args_core(iseq, args, argn->nd_head, dup_rest, flag, keywords);
+        ret = INT2FIX(setup_args_core(iseq, args, RNODE_BLOCK_PASS(argn)->nd_head, &dup_rest, flag, keywords));
         ADD_SEQ(args, arg_block);
     }
     else {
-        ret = setup_args_core(iseq, args, argn, 0, flag, keywords);
+        ret = INT2FIX(setup_args_core(iseq, args, argn, &dup_rest, flag, keywords));
     }
+    setup_args_splat_mut(flag, dup_rest, initial_dup_rest);
     return ret;
 }
 
@@ -5654,7 +6853,7 @@ build_postexe_iseq(rb_iseq_t *iseq, LINK_ANCHOR *ret, const void *ptr)
     ADD_INSN1(ret, body, putspecialobject, INT2FIX(VM_SPECIAL_OBJECT_VMCORE));
     ADD_CALL_WITH_BLOCK(ret, body, id_core_set_postexe, argc, block);
     RB_OBJ_WRITTEN(iseq, Qundef, (VALUE)block);
-    iseq_set_local_table(iseq, 0);
+    iseq_set_local_table(iseq, 0, 0);
 }
 
 static void
@@ -5674,45 +6873,45 @@ compile_named_capture_assign(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE
     ADD_INSN(ret, line_node, dup);
     ADD_INSNL(ret, line_node, branchunless, fail_label);
 
-    for (vars = node; vars; vars = vars->nd_next) {
-	INSN *cap;
-	if (vars->nd_next) {
-	    ADD_INSN(ret, line_node, dup);
-	}
-	last = ret->last;
-        NO_CHECK(COMPILE_POPPED(ret, "capture", vars->nd_head));
-	last = last->next; /* putobject :var */
-	cap = new_insn_send(iseq, line_node, idAREF, INT2FIX(1),
-			    NULL, INT2FIX(0), NULL);
-	ELEM_INSERT_PREV(last->next, (LINK_ELEMENT *)cap);
+    for (vars = node; vars; vars = RNODE_BLOCK(vars)->nd_next) {
+        INSN *cap;
+        if (RNODE_BLOCK(vars)->nd_next) {
+            ADD_INSN(ret, line_node, dup);
+        }
+        last = ret->last;
+        NO_CHECK(COMPILE_POPPED(ret, "capture", RNODE_BLOCK(vars)->nd_head));
+        last = last->next; /* putobject :var */
+        cap = new_insn_send(iseq, nd_line(line_node), nd_node_id(line_node), idAREF, INT2FIX(1),
+                            NULL, INT2FIX(0), NULL);
+        ELEM_INSERT_PREV(last->next, (LINK_ELEMENT *)cap);
 #if !defined(NAMED_CAPTURE_SINGLE_OPT) || NAMED_CAPTURE_SINGLE_OPT-0
-	if (!vars->nd_next && vars == node) {
-	    /* only one name */
-	    DECL_ANCHOR(nom);
+        if (!RNODE_BLOCK(vars)->nd_next && vars == node) {
+            /* only one name */
+            DECL_ANCHOR(nom);
 
-	    INIT_ANCHOR(nom);
-	    ADD_INSNL(nom, line_node, jump, end_label);
-	    ADD_LABEL(nom, fail_label);
+            INIT_ANCHOR(nom);
+            ADD_INSNL(nom, line_node, jump, end_label);
+            ADD_LABEL(nom, fail_label);
 # if 0				/* $~ must be MatchData or nil */
-	    ADD_INSN(nom, line_node, pop);
-	    ADD_INSN(nom, line_node, putnil);
+            ADD_INSN(nom, line_node, pop);
+            ADD_INSN(nom, line_node, putnil);
 # endif
-	    ADD_LABEL(nom, end_label);
-	    (nom->last->next = cap->link.next)->prev = nom->last;
-	    (cap->link.next = nom->anchor.next)->prev = &cap->link;
-	    return;
-	}
+            ADD_LABEL(nom, end_label);
+            (nom->last->next = cap->link.next)->prev = nom->last;
+            (cap->link.next = nom->anchor.next)->prev = &cap->link;
+            return;
+        }
 #endif
     }
     ADD_INSNL(ret, line_node, jump, end_label);
     ADD_LABEL(ret, fail_label);
     ADD_INSN(ret, line_node, pop);
-    for (vars = node; vars; vars = vars->nd_next) {
-	last = ret->last;
-        NO_CHECK(COMPILE_POPPED(ret, "capture", vars->nd_head));
-	last = last->next; /* putobject :var */
-	((INSN*)last)->insn_id = BIN(putnil);
-	((INSN*)last)->operand_size = 0;
+    for (vars = node; vars; vars = RNODE_BLOCK(vars)->nd_next) {
+        last = ret->last;
+        NO_CHECK(COMPILE_POPPED(ret, "capture", RNODE_BLOCK(vars)->nd_head));
+        last = last->next; /* putobject :var */
+        ((INSN*)last)->insn_id = BIN(putnil);
+        ((INSN*)last)->operand_size = 0;
     }
     ADD_LABEL(ret, end_label);
 }
@@ -5722,8 +6921,10 @@ optimizable_range_item_p(const NODE *n)
 {
     if (!n) return FALSE;
     switch (nd_type(n)) {
-      case NODE_LIT:
-        return RB_INTEGER_TYPE_P(n->nd_lit);
+      case NODE_LINE:
+        return TRUE;
+      case NODE_INTEGER:
+        return TRUE;
       case NODE_NIL:
         return TRUE;
       default:
@@ -5731,97 +6932,105 @@ optimizable_range_item_p(const NODE *n)
     }
 }
 
+static VALUE
+optimized_range_item(const NODE *n)
+{
+    switch (nd_type(n)) {
+      case NODE_LINE:
+        return rb_node_line_lineno_val(n);
+      case NODE_INTEGER:
+        return rb_node_integer_literal_val(n);
+      case NODE_FLOAT:
+        return rb_node_float_literal_val(n);
+      case NODE_RATIONAL:
+        return rb_node_rational_literal_val(n);
+      case NODE_IMAGINARY:
+        return rb_node_imaginary_literal_val(n);
+      case NODE_NIL:
+        return Qnil;
+      default:
+        rb_bug("unexpected node: %s", ruby_node_name(nd_type(n)));
+    }
+}
+
 static int
 compile_if(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE *const node, int popped, const enum node_type type)
 {
-    struct rb_iseq_constant_body *const body = ISEQ_BODY(iseq);
-    const NODE *const node_body = type == NODE_IF ? node->nd_body : node->nd_else;
-    const NODE *const node_else = type == NODE_IF ? node->nd_else : node->nd_body;
+    const NODE *const node_body = type == NODE_IF ? RNODE_IF(node)->nd_body : RNODE_UNLESS(node)->nd_else;
+    const NODE *const node_else = type == NODE_IF ? RNODE_IF(node)->nd_else : RNODE_UNLESS(node)->nd_body;
 
     const int line = nd_line(node);
     const NODE *line_node = node;
     DECL_ANCHOR(cond_seq);
-    DECL_ANCHOR(then_seq);
-    DECL_ANCHOR(else_seq);
     LABEL *then_label, *else_label, *end_label;
     VALUE branches = Qfalse;
-    int ci_size;
-    VALUE catch_table = ISEQ_COMPILE_DATA(iseq)->catch_table_ary;
-    long catch_table_size = NIL_P(catch_table) ? 0 : RARRAY_LEN(catch_table);
 
     INIT_ANCHOR(cond_seq);
-    INIT_ANCHOR(then_seq);
-    INIT_ANCHOR(else_seq);
     then_label = NEW_LABEL(line);
     else_label = NEW_LABEL(line);
     end_label = 0;
 
-    compile_branch_condition(iseq, cond_seq, node->nd_cond,
-			     then_label, else_label);
-
-    ci_size = body->ci_size;
-    CHECK(COMPILE_(then_seq, "then", node_body, popped));
-    catch_table = ISEQ_COMPILE_DATA(iseq)->catch_table_ary;
-    if (!then_label->refcnt) {
-        body->ci_size = ci_size;
-        if (!NIL_P(catch_table)) rb_ary_set_len(catch_table, catch_table_size);
-    }
-    else {
-        if (!NIL_P(catch_table)) catch_table_size = RARRAY_LEN(catch_table);
-    }
-
-    ci_size = body->ci_size;
-    CHECK(COMPILE_(else_seq, "else", node_else, popped));
-    catch_table = ISEQ_COMPILE_DATA(iseq)->catch_table_ary;
-    if (!else_label->refcnt) {
-        body->ci_size = ci_size;
-        if (!NIL_P(catch_table)) rb_ary_set_len(catch_table, catch_table_size);
-    }
-    else {
-        if (!NIL_P(catch_table)) catch_table_size = RARRAY_LEN(catch_table);
+    NODE *cond = RNODE_IF(node)->nd_cond;
+    if (nd_type(cond) == NODE_BLOCK) {
+        cond = RNODE_BLOCK(cond)->nd_head;
     }
 
+    CHECK(compile_branch_condition(iseq, cond_seq, cond, then_label, else_label));
     ADD_SEQ(ret, cond_seq);
 
     if (then_label->refcnt && else_label->refcnt) {
-	branches = decl_branch_base(iseq, node, type == NODE_IF ? "if" : "unless");
+        branches = decl_branch_base(iseq, PTR2NUM(node), nd_code_loc(node), type == NODE_IF ? "if" : "unless");
     }
 
     if (then_label->refcnt) {
-	ADD_LABEL(ret, then_label);
-	if (else_label->refcnt) {
-	    add_trace_branch_coverage(
+        ADD_LABEL(ret, then_label);
+
+        DECL_ANCHOR(then_seq);
+        INIT_ANCHOR(then_seq);
+        CHECK(COMPILE_(then_seq, "then", node_body, popped));
+
+        if (else_label->refcnt) {
+            const NODE *const coverage_node = node_body ? node_body : node;
+            add_trace_branch_coverage(
                 iseq,
-		ret,
-                node_body ? node_body : node,
+                ret,
+                nd_code_loc(coverage_node),
+                nd_node_id(coverage_node),
                 0,
-		type == NODE_IF ? "then" : "else",
-		branches);
-	    end_label = NEW_LABEL(line);
-	    ADD_INSNL(then_seq, line_node, jump, end_label);
+                type == NODE_IF ? "then" : "else",
+                branches);
+            end_label = NEW_LABEL(line);
+            ADD_INSNL(then_seq, line_node, jump, end_label);
             if (!popped) {
                 ADD_INSN(then_seq, line_node, pop);
             }
-	}
-	ADD_SEQ(ret, then_seq);
+        }
+        ADD_SEQ(ret, then_seq);
     }
 
     if (else_label->refcnt) {
-	ADD_LABEL(ret, else_label);
-	if (then_label->refcnt) {
-	    add_trace_branch_coverage(
+        ADD_LABEL(ret, else_label);
+
+        DECL_ANCHOR(else_seq);
+        INIT_ANCHOR(else_seq);
+        CHECK(COMPILE_(else_seq, "else", node_else, popped));
+
+        if (then_label->refcnt) {
+            const NODE *const coverage_node = node_else ? node_else : node;
+            add_trace_branch_coverage(
                 iseq,
-		ret,
-                node_else ? node_else : node,
+                ret,
+                nd_code_loc(coverage_node),
+                nd_node_id(coverage_node),
                 1,
-		type == NODE_IF ? "else" : "then",
-		branches);
-	}
-	ADD_SEQ(ret, else_seq);
+                type == NODE_IF ? "else" : "then",
+                branches);
+        }
+        ADD_SEQ(ret, else_seq);
     }
 
     if (end_label) {
-	ADD_LABEL(ret, end_label);
+        ADD_LABEL(ret, end_label);
     }
 
     return COMPILE_OK;
@@ -5850,11 +7059,11 @@ compile_case(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE *const orig_nod
 
     RHASH_TBL_RAW(literals)->type = &cdhash_type;
 
-    CHECK(COMPILE(head, "case base", node->nd_head));
+    CHECK(COMPILE(head, "case base", RNODE_CASE(node)->nd_head));
 
-    branches = decl_branch_base(iseq, node, "case");
+    branches = decl_branch_base(iseq, PTR2NUM(node), nd_code_loc(node), "case");
 
-    node = node->nd_body;
+    node = RNODE_CASE(node)->nd_body;
     EXPECT_NODE("NODE_CASE", node, NODE_WHEN, COMPILE_NG);
     type = nd_type(node);
     line = nd_line(node);
@@ -5866,74 +7075,79 @@ compile_case(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE *const orig_nod
     ADD_SEQ(ret, head);	/* case VAL */
 
     while (type == NODE_WHEN) {
-	LABEL *l1;
+        LABEL *l1;
+
+        l1 = NEW_LABEL(line);
+        ADD_LABEL(body_seq, l1);
+        ADD_INSN(body_seq, line_node, pop);
 
-	l1 = NEW_LABEL(line);
-	ADD_LABEL(body_seq, l1);
-	ADD_INSN(body_seq, line_node, pop);
-	add_trace_branch_coverage(
+        const NODE *const coverage_node = RNODE_WHEN(node)->nd_body ? RNODE_WHEN(node)->nd_body : node;
+        add_trace_branch_coverage(
                 iseq,
-		body_seq,
-                node->nd_body ? node->nd_body : node,
+                body_seq,
+                nd_code_loc(coverage_node),
+                nd_node_id(coverage_node),
                 branch_id++,
-		"when",
-		branches);
-	CHECK(COMPILE_(body_seq, "when body", node->nd_body, popped));
-	ADD_INSNL(body_seq, line_node, jump, endlabel);
-
-	vals = node->nd_head;
-	if (vals) {
-	    switch (nd_type(vals)) {
-	      case NODE_LIST:
-		only_special_literals = when_vals(iseq, cond_seq, vals, l1, only_special_literals, literals);
-		if (only_special_literals < 0) return COMPILE_NG;
-		break;
-	      case NODE_SPLAT:
-	      case NODE_ARGSCAT:
-	      case NODE_ARGSPUSH:
-		only_special_literals = 0;
-		CHECK(when_splat_vals(iseq, cond_seq, vals, l1, only_special_literals, literals));
-		break;
-	      default:
-		UNKNOWN_NODE("NODE_CASE", vals, COMPILE_NG);
-	    }
-	}
-	else {
-	    EXPECT_NODE_NONULL("NODE_CASE", node, NODE_LIST, COMPILE_NG);
-	}
-
-	node = node->nd_next;
-	if (!node) {
-	    break;
-	}
-	type = nd_type(node);
-	line = nd_line(node);
+                "when",
+                branches);
+
+        CHECK(COMPILE_(body_seq, "when body", RNODE_WHEN(node)->nd_body, popped));
+        ADD_INSNL(body_seq, line_node, jump, endlabel);
+
+        vals = RNODE_WHEN(node)->nd_head;
+        if (vals) {
+            switch (nd_type(vals)) {
+              case NODE_LIST:
+                only_special_literals = when_vals(iseq, cond_seq, vals, l1, only_special_literals, literals);
+                if (only_special_literals < 0) return COMPILE_NG;
+                break;
+              case NODE_SPLAT:
+              case NODE_ARGSCAT:
+              case NODE_ARGSPUSH:
+                only_special_literals = 0;
+                CHECK(when_splat_vals(iseq, cond_seq, vals, l1, only_special_literals, literals));
+                break;
+              default:
+                UNKNOWN_NODE("NODE_CASE", vals, COMPILE_NG);
+            }
+        }
+        else {
+            EXPECT_NODE_NONULL("NODE_CASE", node, NODE_LIST, COMPILE_NG);
+        }
+
+        node = RNODE_WHEN(node)->nd_next;
+        if (!node) {
+            break;
+        }
+        type = nd_type(node);
+        line = nd_line(node);
         line_node = node;
     }
     /* else */
     if (node) {
-	ADD_LABEL(cond_seq, elselabel);
-	ADD_INSN(cond_seq, line_node, pop);
-	add_trace_branch_coverage(iseq, cond_seq, node, branch_id, "else", branches);
-	CHECK(COMPILE_(cond_seq, "else", node, popped));
-	ADD_INSNL(cond_seq, line_node, jump, endlabel);
+        ADD_LABEL(cond_seq, elselabel);
+        ADD_INSN(cond_seq, line_node, pop);
+        add_trace_branch_coverage(iseq, cond_seq, nd_code_loc(node), nd_node_id(node), branch_id, "else", branches);
+        CHECK(COMPILE_(cond_seq, "else", node, popped));
+        ADD_INSNL(cond_seq, line_node, jump, endlabel);
     }
     else {
-	debugs("== else (implicit)\n");
-	ADD_LABEL(cond_seq, elselabel);
-	ADD_INSN(cond_seq, orig_node, pop);
-	add_trace_branch_coverage(iseq, cond_seq, orig_node, branch_id, "else", branches);
-	if (!popped) {
-	    ADD_INSN(cond_seq, orig_node, putnil);
-	}
-	ADD_INSNL(cond_seq, orig_node, jump, endlabel);
+        debugs("== else (implicit)\n");
+        ADD_LABEL(cond_seq, elselabel);
+        ADD_INSN(cond_seq, orig_node, pop);
+        add_trace_branch_coverage(iseq, cond_seq, nd_code_loc(orig_node), nd_node_id(orig_node), branch_id, "else", branches);
+        if (!popped) {
+            ADD_INSN(cond_seq, orig_node, putnil);
+        }
+        ADD_INSNL(cond_seq, orig_node, jump, endlabel);
     }
 
     if (only_special_literals && ISEQ_COMPILE_DATA(iseq)->option->specialized_instruction) {
-	ADD_INSN(ret, orig_node, dup);
-	ADD_INSN2(ret, orig_node, opt_case_dispatch, literals, elselabel);
+        ADD_INSN(ret, orig_node, dup);
+        rb_obj_hide(literals);
+        ADD_INSN2(ret, orig_node, opt_case_dispatch, literals, elselabel);
         RB_OBJ_WRITTEN(iseq, Qundef, literals);
-	LABEL_REF(elselabel);
+        LABEL_REF(elselabel);
     }
 
     ADD_SEQ(ret, cond_seq);
@@ -5947,68 +7161,74 @@ compile_case2(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE *const orig_no
 {
     const NODE *vals;
     const NODE *val;
-    const NODE *node = orig_node->nd_body;
+    const NODE *node = RNODE_CASE2(orig_node)->nd_body;
     LABEL *endlabel;
     DECL_ANCHOR(body_seq);
     VALUE branches = Qfalse;
     int branch_id = 0;
 
-    branches = decl_branch_base(iseq, orig_node, "case");
+    branches = decl_branch_base(iseq, PTR2NUM(orig_node), nd_code_loc(orig_node), "case");
 
     INIT_ANCHOR(body_seq);
     endlabel = NEW_LABEL(nd_line(node));
 
     while (node && nd_type_p(node, NODE_WHEN)) {
-	const int line = nd_line(node);
-	LABEL *l1 = NEW_LABEL(line);
-	ADD_LABEL(body_seq, l1);
-	add_trace_branch_coverage(
+        const int line = nd_line(node);
+        LABEL *l1 = NEW_LABEL(line);
+        ADD_LABEL(body_seq, l1);
+
+        const NODE *const coverage_node = RNODE_WHEN(node)->nd_body ? RNODE_WHEN(node)->nd_body : node;
+        add_trace_branch_coverage(
                 iseq,
-		body_seq,
-		node->nd_body ? node->nd_body : node,
+                body_seq,
+                nd_code_loc(coverage_node),
+                nd_node_id(coverage_node),
                 branch_id++,
-		"when",
-		branches);
-	CHECK(COMPILE_(body_seq, "when", node->nd_body, popped));
-	ADD_INSNL(body_seq, node, jump, endlabel);
+                "when",
+                branches);
 
-	vals = node->nd_head;
-	if (!vals) {
+        CHECK(COMPILE_(body_seq, "when", RNODE_WHEN(node)->nd_body, popped));
+        ADD_INSNL(body_seq, node, jump, endlabel);
+
+        vals = RNODE_WHEN(node)->nd_head;
+        if (!vals) {
             EXPECT_NODE_NONULL("NODE_WHEN", node, NODE_LIST, COMPILE_NG);
-	}
-	switch (nd_type(vals)) {
-	  case NODE_LIST:
-	    while (vals) {
-		LABEL *lnext;
-		val = vals->nd_head;
-		lnext = NEW_LABEL(nd_line(val));
-		debug_compile("== when2\n", (void)0);
-		CHECK(compile_branch_condition(iseq, ret, val, l1, lnext));
-		ADD_LABEL(ret, lnext);
-		vals = vals->nd_next;
-	    }
-	    break;
-	  case NODE_SPLAT:
-	  case NODE_ARGSCAT:
-	  case NODE_ARGSPUSH:
-	    ADD_INSN(ret, vals, putnil);
-	    CHECK(COMPILE(ret, "when2/cond splat", vals));
-	    ADD_INSN1(ret, vals, checkmatch, INT2FIX(VM_CHECKMATCH_TYPE_WHEN | VM_CHECKMATCH_ARRAY));
-	    ADD_INSNL(ret, vals, branchif, l1);
-	    break;
-	  default:
-	    UNKNOWN_NODE("NODE_WHEN", vals, COMPILE_NG);
-	}
-	node = node->nd_next;
+        }
+        switch (nd_type(vals)) {
+          case NODE_LIST:
+            while (vals) {
+                LABEL *lnext;
+                val = RNODE_LIST(vals)->nd_head;
+                lnext = NEW_LABEL(nd_line(val));
+                debug_compile("== when2\n", (void)0);
+                CHECK(compile_branch_condition(iseq, ret, val, l1, lnext));
+                ADD_LABEL(ret, lnext);
+                vals = RNODE_LIST(vals)->nd_next;
+            }
+            break;
+          case NODE_SPLAT:
+          case NODE_ARGSCAT:
+          case NODE_ARGSPUSH:
+            ADD_INSN(ret, vals, putnil);
+            CHECK(COMPILE(ret, "when2/cond splat", vals));
+            ADD_INSN1(ret, vals, checkmatch, INT2FIX(VM_CHECKMATCH_TYPE_WHEN | VM_CHECKMATCH_ARRAY));
+            ADD_INSNL(ret, vals, branchif, l1);
+            break;
+          default:
+            UNKNOWN_NODE("NODE_WHEN", vals, COMPILE_NG);
+        }
+        node = RNODE_WHEN(node)->nd_next;
     }
     /* else */
+    const NODE *const coverage_node = node ? node : orig_node;
     add_trace_branch_coverage(
         iseq,
-	ret,
-        node ? node : orig_node,
+        ret,
+        nd_code_loc(coverage_node),
+        nd_node_id(coverage_node),
         branch_id,
-	"else",
-	branches);
+        "else",
+        branches);
     CHECK(COMPILE_(ret, "else", node, popped));
     ADD_INSNL(ret, orig_node, jump, endlabel);
 
@@ -6091,14 +7311,13 @@ iseq_compile_pattern_each(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE *c
          * match_failed:
          *   goto unmatched
          */
-        struct rb_ary_pattern_info *apinfo = node->nd_apinfo;
-        const NODE *args = apinfo->pre_args;
-        const int pre_args_num = apinfo->pre_args ? rb_long2int(apinfo->pre_args->nd_alen) : 0;
-        const int post_args_num = apinfo->post_args ? rb_long2int(apinfo->post_args->nd_alen) : 0;
+        const NODE *args = RNODE_ARYPTN(node)->pre_args;
+        const int pre_args_num = RNODE_ARYPTN(node)->pre_args ? rb_long2int(RNODE_LIST(RNODE_ARYPTN(node)->pre_args)->as.nd_alen) : 0;
+        const int post_args_num = RNODE_ARYPTN(node)->post_args ? rb_long2int(RNODE_LIST(RNODE_ARYPTN(node)->post_args)->as.nd_alen) : 0;
 
         const int min_argc = pre_args_num + post_args_num;
-        const int use_rest_num = apinfo->rest_arg && (NODE_NAMED_REST_P(apinfo->rest_arg) ||
-                                                      (!NODE_NAMED_REST_P(apinfo->rest_arg) && post_args_num > 0));
+        const int use_rest_num = RNODE_ARYPTN(node)->rest_arg && (NODE_NAMED_REST_P(RNODE_ARYPTN(node)->rest_arg) ||
+                                                      (!NODE_NAMED_REST_P(RNODE_ARYPTN(node)->rest_arg) && post_args_num > 0));
 
         LABEL *match_failed, *type_error, *deconstruct, *deconstructed;
         int i;
@@ -6122,10 +7341,10 @@ iseq_compile_pattern_each(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE *c
         ADD_INSN(ret, line_node, dup);
         ADD_SEND(ret, line_node, idLength, INT2FIX(0));
         ADD_INSN1(ret, line_node, putobject, INT2FIX(min_argc));
-        ADD_SEND(ret, line_node, apinfo->rest_arg ? idGE : idEq, INT2FIX(1)); // (1)
+        ADD_SEND(ret, line_node, RNODE_ARYPTN(node)->rest_arg ? idGE : idEq, INT2FIX(1)); // (1)
         if (in_single_pattern) {
             CHECK(iseq_compile_pattern_set_length_errmsg(iseq, ret, node,
-                                                         apinfo->rest_arg ? rb_fstring_lit("%p length mismatch (given %p, expected %p+)") :
+                                                         RNODE_ARYPTN(node)->rest_arg ? rb_fstring_lit("%p length mismatch (given %p, expected %p+)") :
                                                                             rb_fstring_lit("%p length mismatch (given %p, expected %p)"),
                                                          INT2FIX(min_argc), base_index + 1 /* (1) */));
         }
@@ -6135,12 +7354,12 @@ iseq_compile_pattern_each(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE *c
             ADD_INSN(ret, line_node, dup);
             ADD_INSN1(ret, line_node, putobject, INT2FIX(i));
             ADD_SEND(ret, line_node, idAREF, INT2FIX(1)); // (2)
-            CHECK(iseq_compile_pattern_match(iseq, ret, args->nd_head, match_failed, in_single_pattern, in_alt_pattern, base_index + 1 /* (2) */, false));
-            args = args->nd_next;
+            CHECK(iseq_compile_pattern_match(iseq, ret, RNODE_LIST(args)->nd_head, match_failed, in_single_pattern, in_alt_pattern, base_index + 1 /* (2) */, false));
+            args = RNODE_LIST(args)->nd_next;
         }
 
-        if (apinfo->rest_arg) {
-            if (NODE_NAMED_REST_P(apinfo->rest_arg)) {
+        if (RNODE_ARYPTN(node)->rest_arg) {
+            if (NODE_NAMED_REST_P(RNODE_ARYPTN(node)->rest_arg)) {
                 ADD_INSN(ret, line_node, dup);
                 ADD_INSN1(ret, line_node, putobject, INT2FIX(pre_args_num));
                 ADD_INSN1(ret, line_node, topn, INT2FIX(1));
@@ -6150,7 +7369,7 @@ iseq_compile_pattern_each(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE *c
                 ADD_INSN1(ret, line_node, setn, INT2FIX(4));
                 ADD_SEND(ret, line_node, idAREF, INT2FIX(2)); // (3)
 
-                CHECK(iseq_compile_pattern_match(iseq, ret, apinfo->rest_arg, match_failed, in_single_pattern, in_alt_pattern, base_index + 1 /* (3) */, false));
+                CHECK(iseq_compile_pattern_match(iseq, ret, RNODE_ARYPTN(node)->rest_arg, match_failed, in_single_pattern, in_alt_pattern, base_index + 1 /* (3) */, false));
             }
             else {
                 if (post_args_num > 0) {
@@ -6164,7 +7383,7 @@ iseq_compile_pattern_each(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE *c
             }
         }
 
-        args = apinfo->post_args;
+        args = RNODE_ARYPTN(node)->post_args;
         for (i = 0; i < post_args_num; i++) {
             ADD_INSN(ret, line_node, dup);
 
@@ -6173,8 +7392,8 @@ iseq_compile_pattern_each(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE *c
             ADD_SEND(ret, line_node, idPLUS, INT2FIX(1));
 
             ADD_SEND(ret, line_node, idAREF, INT2FIX(1)); // (4)
-            CHECK(iseq_compile_pattern_match(iseq, ret, args->nd_head, match_failed, in_single_pattern, in_alt_pattern, base_index + 1 /* (4) */, false));
-            args = args->nd_next;
+            CHECK(iseq_compile_pattern_match(iseq, ret, RNODE_LIST(args)->nd_head, match_failed, in_single_pattern, in_alt_pattern, base_index + 1 /* (4) */, false));
+            args = RNODE_LIST(args)->nd_next;
         }
 
         ADD_INSN(ret, line_node, pop);
@@ -6252,9 +7471,8 @@ iseq_compile_pattern_each(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE *c
          * match_failed:
          *   goto unmatched
          */
-        struct rb_fnd_pattern_info *fpinfo = node->nd_fpinfo;
-        const NODE *args = fpinfo->args;
-        const int args_num = fpinfo->args ? rb_long2int(fpinfo->args->nd_alen) : 0;
+        const NODE *args = RNODE_FNDPTN(node)->args;
+        const int args_num = RNODE_FNDPTN(node)->args ? rb_long2int(RNODE_LIST(RNODE_FNDPTN(node)->args)->as.nd_alen) : 0;
 
         LABEL *match_failed, *type_error, *deconstruct, *deconstructed;
         match_failed = NEW_LABEL(line);
@@ -6307,25 +7525,25 @@ iseq_compile_pattern_each(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE *c
                 }
                 ADD_SEND(ret, line_node, idAREF, INT2FIX(1)); // (5)
 
-                CHECK(iseq_compile_pattern_match(iseq, ret, args->nd_head, next_loop, in_single_pattern, in_alt_pattern, base_index + 4 /* (2), (3), (4), (5) */, false));
-                args = args->nd_next;
+                CHECK(iseq_compile_pattern_match(iseq, ret, RNODE_LIST(args)->nd_head, next_loop, in_single_pattern, in_alt_pattern, base_index + 4 /* (2), (3), (4), (5) */, false));
+                args = RNODE_LIST(args)->nd_next;
             }
 
-            if (NODE_NAMED_REST_P(fpinfo->pre_rest_arg)) {
+            if (NODE_NAMED_REST_P(RNODE_FNDPTN(node)->pre_rest_arg)) {
                 ADD_INSN1(ret, line_node, topn, INT2FIX(3));
                 ADD_INSN1(ret, line_node, putobject, INT2FIX(0));
                 ADD_INSN1(ret, line_node, topn, INT2FIX(2));
                 ADD_SEND(ret, line_node, idAREF, INT2FIX(2)); // (6)
-                CHECK(iseq_compile_pattern_match(iseq, ret, fpinfo->pre_rest_arg, find_failed, in_single_pattern, in_alt_pattern, base_index + 4 /* (2), (3), (4), (6) */, false));
+                CHECK(iseq_compile_pattern_match(iseq, ret, RNODE_FNDPTN(node)->pre_rest_arg, find_failed, in_single_pattern, in_alt_pattern, base_index + 4 /* (2), (3), (4), (6) */, false));
             }
-            if (NODE_NAMED_REST_P(fpinfo->post_rest_arg)) {
+            if (NODE_NAMED_REST_P(RNODE_FNDPTN(node)->post_rest_arg)) {
                 ADD_INSN1(ret, line_node, topn, INT2FIX(3));
                 ADD_INSN1(ret, line_node, topn, INT2FIX(1));
                 ADD_INSN1(ret, line_node, putobject, INT2FIX(args_num));
                 ADD_SEND(ret, line_node, idPLUS, INT2FIX(1));
                 ADD_INSN1(ret, line_node, topn, INT2FIX(3));
                 ADD_SEND(ret, line_node, idAREF, INT2FIX(2)); // (7)
-                CHECK(iseq_compile_pattern_match(iseq, ret, fpinfo->post_rest_arg, find_failed, in_single_pattern, in_alt_pattern, base_index + 4 /* (2), (3),(4), (7) */, false));
+                CHECK(iseq_compile_pattern_match(iseq, ret, RNODE_FNDPTN(node)->post_rest_arg, find_failed, in_single_pattern, in_alt_pattern, base_index + 4 /* (2), (3),(4), (7) */, false));
             }
             ADD_INSNL(ret, line_node, jump, find_succeeded);
 
@@ -6439,12 +7657,12 @@ iseq_compile_pattern_each(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE *c
         match_failed = NEW_LABEL(line);
         type_error = NEW_LABEL(line);
 
-        if (node->nd_pkwargs && !node->nd_pkwrestarg) {
-            const NODE *kw_args = node->nd_pkwargs->nd_head;
-            keys = rb_ary_new_capa(kw_args ? kw_args->nd_alen/2 : 0);
+        if (RNODE_HSHPTN(node)->nd_pkwargs && !RNODE_HSHPTN(node)->nd_pkwrestarg) {
+            const NODE *kw_args = RNODE_HASH(RNODE_HSHPTN(node)->nd_pkwargs)->nd_head;
+            keys = rb_ary_new_capa(kw_args ? RNODE_LIST(kw_args)->as.nd_alen/2 : 0);
             while (kw_args) {
-                rb_ary_push(keys, kw_args->nd_head->nd_lit);
-                kw_args = kw_args->nd_next->nd_next;
+                rb_ary_push(keys, get_symbol_value(iseq, RNODE_LIST(kw_args)->nd_head));
+                kw_args = RNODE_LIST(RNODE_LIST(kw_args)->nd_next)->nd_next;
             }
         }
 
@@ -6462,6 +7680,7 @@ iseq_compile_pattern_each(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE *c
             ADD_INSN(ret, line_node, putnil);
         }
         else {
+            RB_OBJ_SET_FROZEN_SHAREABLE(keys);
             ADD_INSN1(ret, line_node, duparray, keys);
             RB_OBJ_WRITTEN(iseq, Qundef, rb_obj_hide(keys));
         }
@@ -6471,28 +7690,23 @@ iseq_compile_pattern_each(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE *c
         ADD_INSN1(ret, line_node, checktype, INT2FIX(T_HASH));
         ADD_INSNL(ret, line_node, branchunless, type_error);
 
-        if (node->nd_pkwrestarg) {
+        if (RNODE_HSHPTN(node)->nd_pkwrestarg) {
             ADD_SEND(ret, line_node, rb_intern("dup"), INT2FIX(0));
         }
 
-        if (node->nd_pkwargs) {
+        if (RNODE_HSHPTN(node)->nd_pkwargs) {
             int i;
             int keys_num;
             const NODE *args;
-            args = node->nd_pkwargs->nd_head;
+            args = RNODE_HASH(RNODE_HSHPTN(node)->nd_pkwargs)->nd_head;
             if (args) {
                 DECL_ANCHOR(match_values);
                 INIT_ANCHOR(match_values);
-                keys_num = rb_long2int(args->nd_alen) / 2;
+                keys_num = rb_long2int(RNODE_LIST(args)->as.nd_alen) / 2;
                 for (i = 0; i < keys_num; i++) {
-                    NODE *key_node = args->nd_head;
-                    NODE *value_node = args->nd_next->nd_head;
-                    VALUE key;
-
-                    if (!nd_type_p(key_node, NODE_LIT)) {
-                        UNKNOWN_NODE("NODE_IN", key_node, COMPILE_NG);
-                    }
-                    key = key_node->nd_lit;
+                    NODE *key_node = RNODE_LIST(args)->nd_head;
+                    NODE *value_node = RNODE_LIST(RNODE_LIST(args)->nd_next)->nd_head;
+                    VALUE key = get_symbol_value(iseq, key_node);
 
                     ADD_INSN(ret, line_node, dup);
                     ADD_INSN1(ret, line_node, putobject, key);
@@ -6504,7 +7718,8 @@ iseq_compile_pattern_each(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE *c
                         ADD_INSN(ret, line_node, dup);
                         ADD_INSNL(ret, line_node, branchif, match_succeeded);
 
-                        ADD_INSN1(ret, line_node, putobject, rb_str_freeze(rb_sprintf("key not found: %+"PRIsVALUE, key))); // (4)
+                        VALUE str = rb_str_freeze(rb_sprintf("key not found: %+"PRIsVALUE, key));
+                        ADD_INSN1(ret, line_node, putobject, RB_OBJ_SET_SHAREABLE(str)); // (4)
                         ADD_INSN1(ret, line_node, setn, INT2FIX(base_index + CASE3_BI_OFFSET_ERROR_STRING + 2 /* (3), (4) */));
                         ADD_INSN1(ret, line_node, putobject, Qtrue); // (5)
                         ADD_INSN1(ret, line_node, setn, INT2FIX(base_index + CASE3_BI_OFFSET_KEY_ERROR_P + 3 /* (3), (4), (5) */));
@@ -6521,9 +7736,9 @@ iseq_compile_pattern_each(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE *c
 
                     ADD_INSN(match_values, line_node, dup);
                     ADD_INSN1(match_values, line_node, putobject, key);
-                    ADD_SEND(match_values, line_node, node->nd_pkwrestarg ? rb_intern("delete") : idAREF, INT2FIX(1)); // (8)
+                    ADD_SEND(match_values, line_node, RNODE_HSHPTN(node)->nd_pkwrestarg ? rb_intern("delete") : idAREF, INT2FIX(1)); // (8)
                     CHECK(iseq_compile_pattern_match(iseq, match_values, value_node, match_failed, in_single_pattern, in_alt_pattern, base_index + 1 /* (8) */, false));
-                    args = args->nd_next->nd_next;
+                    args = RNODE_LIST(RNODE_LIST(args)->nd_next)->nd_next;
                 }
                 ADD_SEQ(ret, match_values);
             }
@@ -6537,8 +7752,8 @@ iseq_compile_pattern_each(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE *c
             ADD_INSNL(ret, line_node, branchunless, match_failed);
         }
 
-        if (node->nd_pkwrestarg) {
-            if (node->nd_pkwrestarg == NODE_SPECIAL_NO_REST_KEYWORD) {
+        if (RNODE_HSHPTN(node)->nd_pkwrestarg) {
+            if (RNODE_HSHPTN(node)->nd_pkwrestarg == NODE_SPECIAL_NO_REST_KEYWORD) {
                 ADD_INSN(ret, line_node, dup);
                 ADD_SEND(ret, line_node, idEmptyP, INT2FIX(0)); // (10)
                 if (in_single_pattern) {
@@ -6548,7 +7763,7 @@ iseq_compile_pattern_each(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE *c
             }
             else {
                 ADD_INSN(ret, line_node, dup); // (11)
-                CHECK(iseq_compile_pattern_match(iseq, ret, node->nd_pkwrestarg, match_failed, in_single_pattern, in_alt_pattern, base_index + 1 /* (11) */, false));
+                CHECK(iseq_compile_pattern_match(iseq, ret, RNODE_HSHPTN(node)->nd_pkwrestarg, match_failed, in_single_pattern, in_alt_pattern, base_index + 1 /* (11) */, false));
             }
         }
 
@@ -6568,7 +7783,15 @@ iseq_compile_pattern_each(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE *c
         ADD_INSNL(ret, line_node, jump, unmatched);
         break;
       }
-      case NODE_LIT:
+      case NODE_SYM:
+      case NODE_REGX:
+      case NODE_LINE:
+      case NODE_INTEGER:
+      case NODE_FLOAT:
+      case NODE_RATIONAL:
+      case NODE_IMAGINARY:
+      case NODE_FILE:
+      case NODE_ENCODING:
       case NODE_STR:
       case NODE_XSTR:
       case NODE_DSTR:
@@ -6592,6 +7815,8 @@ iseq_compile_pattern_each(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE *c
       case NODE_COLON2:
       case NODE_COLON3:
       case NODE_BEGIN:
+      case NODE_BLOCK:
+      case NODE_ONCE:
         CHECK(COMPILE(ret, "case in literal", node)); // (1)
         if (in_single_pattern) {
             ADD_INSN1(ret, line_node, dupn, INT2FIX(2));
@@ -6605,7 +7830,7 @@ iseq_compile_pattern_each(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE *c
         break;
       case NODE_LASGN: {
         struct rb_iseq_constant_body *const body = ISEQ_BODY(iseq);
-        ID id = node->nd_vid;
+        ID id = RNODE_LASGN(node)->nd_vid;
         int idx = ISEQ_BODY(body->local_iseq)->local_table_size - get_local_var_idx(iseq, id);
 
         if (in_alt_pattern) {
@@ -6623,7 +7848,7 @@ iseq_compile_pattern_each(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE *c
       }
       case NODE_DASGN: {
         int idx, lv, ls;
-        ID id = node->nd_vid;
+        ID id = RNODE_DASGN(node)->nd_vid;
 
         idx = get_dyna_var_idx(iseq, id, &lv, &ls);
 
@@ -6649,8 +7874,8 @@ iseq_compile_pattern_each(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE *c
       case NODE_UNLESS: {
         LABEL *match_failed;
         match_failed = unmatched;
-        CHECK(iseq_compile_pattern_match(iseq, ret, node->nd_body, unmatched, in_single_pattern, in_alt_pattern, base_index, use_deconstructed_cache));
-        CHECK(COMPILE(ret, "case in if", node->nd_cond));
+        CHECK(iseq_compile_pattern_match(iseq, ret, RNODE_IF(node)->nd_body, unmatched, in_single_pattern, in_alt_pattern, base_index, use_deconstructed_cache));
+        CHECK(COMPILE(ret, "case in if", RNODE_IF(node)->nd_cond));
         if (in_single_pattern) {
             LABEL *match_succeeded;
             match_succeeded = NEW_LABEL(line);
@@ -6687,15 +7912,15 @@ iseq_compile_pattern_each(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE *c
         LABEL *match_failed;
         match_failed = NEW_LABEL(line);
 
-        n = node->nd_head;
-        if (! (nd_type_p(n, NODE_LIST) && n->nd_alen == 2)) {
+        n = RNODE_HASH(node)->nd_head;
+        if (! (nd_type_p(n, NODE_LIST) && RNODE_LIST(n)->as.nd_alen == 2)) {
             COMPILE_ERROR(ERROR_ARGS "unexpected node");
             return COMPILE_NG;
         }
 
         ADD_INSN(ret, line_node, dup); // (1)
-        CHECK(iseq_compile_pattern_match(iseq, ret, n->nd_head, match_failed, in_single_pattern, in_alt_pattern, base_index + 1 /* (1) */, use_deconstructed_cache));
-        CHECK(iseq_compile_pattern_each(iseq, ret, n->nd_next->nd_head, matched, match_failed, in_single_pattern, in_alt_pattern, base_index, false));
+        CHECK(iseq_compile_pattern_match(iseq, ret, RNODE_LIST(n)->nd_head, match_failed, in_single_pattern, in_alt_pattern, base_index + 1 /* (1) */, use_deconstructed_cache));
+        CHECK(iseq_compile_pattern_each(iseq, ret, RNODE_LIST(RNODE_LIST(n)->nd_next)->nd_head, matched, match_failed, in_single_pattern, in_alt_pattern, base_index, false));
         ADD_INSN(ret, line_node, putnil);
 
         ADD_LABEL(ret, match_failed);
@@ -6709,13 +7934,13 @@ iseq_compile_pattern_each(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE *c
         fin = NEW_LABEL(line);
 
         ADD_INSN(ret, line_node, dup); // (1)
-        CHECK(iseq_compile_pattern_each(iseq, ret, node->nd_1st, match_succeeded, fin, in_single_pattern, true, base_index + 1 /* (1) */, use_deconstructed_cache));
+        CHECK(iseq_compile_pattern_each(iseq, ret, RNODE_OR(node)->nd_1st, match_succeeded, fin, in_single_pattern, true, base_index + 1 /* (1) */, use_deconstructed_cache));
         ADD_LABEL(ret, match_succeeded);
         ADD_INSN(ret, line_node, pop);
         ADD_INSNL(ret, line_node, jump, matched);
         ADD_INSN(ret, line_node, putnil);
         ADD_LABEL(ret, fin);
-        CHECK(iseq_compile_pattern_each(iseq, ret, node->nd_2nd, matched, unmatched, in_single_pattern, true, base_index, use_deconstructed_cache));
+        CHECK(iseq_compile_pattern_each(iseq, ret, RNODE_OR(node)->nd_2nd, matched, unmatched, in_single_pattern, true, base_index, use_deconstructed_cache));
         break;
       }
       default:
@@ -6738,9 +7963,9 @@ iseq_compile_pattern_constant(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NOD
 {
     const NODE *line_node = node;
 
-    if (node->nd_pconst) {
+    if (RNODE_ARYPTN(node)->nd_pconst) {
         ADD_INSN(ret, line_node, dup); // (1)
-        CHECK(COMPILE(ret, "constant", node->nd_pconst)); // (2)
+        CHECK(COMPILE(ret, "constant", RNODE_ARYPTN(node)->nd_pconst)); // (2)
         if (in_single_pattern) {
             ADD_INSN1(ret, line_node, dupn, INT2FIX(2));
         }
@@ -6941,14 +8166,14 @@ compile_case3(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE *const orig_no
     INIT_ANCHOR(body_seq);
     INIT_ANCHOR(cond_seq);
 
-    branches = decl_branch_base(iseq, node, "case");
+    branches = decl_branch_base(iseq, PTR2NUM(node), nd_code_loc(node), "case");
 
-    node = node->nd_body;
+    node = RNODE_CASE3(node)->nd_body;
     EXPECT_NODE("NODE_CASE3", node, NODE_IN, COMPILE_NG);
     type = nd_type(node);
     line = nd_line(node);
     line_node = node;
-    single_pattern = !node->nd_next;
+    single_pattern = !RNODE_IN(node)->nd_next;
 
     endlabel = NEW_LABEL(line);
     elselabel = NEW_LABEL(line);
@@ -6962,7 +8187,7 @@ compile_case3(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE *const orig_no
     }
     ADD_INSN(head, line_node, putnil); /* allocate stack for cached #deconstruct value */
 
-    CHECK(COMPILE(head, "case base", orig_node->nd_head));
+    CHECK(COMPILE(head, "case base", RNODE_CASE3(orig_node)->nd_head));
 
     ADD_SEQ(ret, head);	/* case VAL */
 
@@ -6975,17 +8200,21 @@ compile_case3(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE *const orig_no
         l1 = NEW_LABEL(line);
         ADD_LABEL(body_seq, l1);
         ADD_INSN1(body_seq, line_node, adjuststack, INT2FIX(single_pattern ? 6 : 2));
+
+        const NODE *const coverage_node = RNODE_IN(node)->nd_body ? RNODE_IN(node)->nd_body : node;
         add_trace_branch_coverage(
             iseq,
             body_seq,
-            node->nd_body ? node->nd_body : node,
+            nd_code_loc(coverage_node),
+            nd_node_id(coverage_node),
             branch_id++,
             "in",
             branches);
-        CHECK(COMPILE_(body_seq, "in body", node->nd_body, popped));
+
+        CHECK(COMPILE_(body_seq, "in body", RNODE_IN(node)->nd_body, popped));
         ADD_INSNL(body_seq, line_node, jump, endlabel);
 
-        pattern = node->nd_head;
+        pattern = RNODE_IN(node)->nd_head;
         if (pattern) {
             int pat_line = nd_line(pattern);
             LABEL *next_pat = NEW_LABEL(pat_line);
@@ -7000,7 +8229,7 @@ compile_case3(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE *const orig_no
             return COMPILE_NG;
         }
 
-        node = node->nd_next;
+        node = RNODE_IN(node)->nd_next;
         if (!node) {
             break;
         }
@@ -7013,7 +8242,7 @@ compile_case3(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE *const orig_no
         ADD_LABEL(cond_seq, elselabel);
         ADD_INSN(cond_seq, line_node, pop);
         ADD_INSN(cond_seq, line_node, pop); /* discard cached #deconstruct value */
-        add_trace_branch_coverage(iseq, cond_seq, node, branch_id, "else", branches);
+        add_trace_branch_coverage(iseq, cond_seq, nd_code_loc(node), nd_node_id(node), branch_id, "else", branches);
         CHECK(COMPILE_(cond_seq, "else", node, popped));
         ADD_INSNL(cond_seq, line_node, jump, endlabel);
         ADD_INSN(cond_seq, line_node, putnil);
@@ -7024,7 +8253,7 @@ compile_case3(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE *const orig_no
     else {
         debugs("== else (implicit)\n");
         ADD_LABEL(cond_seq, elselabel);
-        add_trace_branch_coverage(iseq, cond_seq, orig_node, branch_id, "else", branches);
+        add_trace_branch_coverage(iseq, cond_seq, nd_code_loc(orig_node), nd_node_id(orig_node), branch_id, "else", branches);
         ADD_INSN1(cond_seq, orig_node, putspecialobject, INT2FIX(VM_SPECIAL_OBJECT_VMCORE));
 
         if (single_pattern) {
@@ -7042,6 +8271,7 @@ compile_case3(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE *const orig_no
             fin = NEW_LABEL(line);
 
             kw_arg = rb_xmalloc_mul_add(2, sizeof(VALUE), sizeof(struct rb_callinfo_kwarg));
+            kw_arg->references = 0;
             kw_arg->keyword_len = 2;
             kw_arg->keywords[0] = ID2SYM(rb_intern("matchee"));
             kw_arg->keywords[1] = ID2SYM(rb_intern("key"));
@@ -7125,12 +8355,12 @@ compile_loop(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE *const node, in
     ISEQ_COMPILE_DATA(iseq)->loopval_popped = 0;
     push_ensure_entry(iseq, &enl, NULL, NULL);
 
-    if (node->nd_state == 1) {
-	ADD_INSNL(ret, line_node, jump, next_label);
+    if (RNODE_WHILE(node)->nd_state == 1) {
+        ADD_INSNL(ret, line_node, jump, next_label);
     }
     else {
-	tmp_label = NEW_LABEL(line);
-	ADD_INSNL(ret, line_node, jump, tmp_label);
+        tmp_label = NEW_LABEL(line);
+        ADD_INSNL(ret, line_node, jump, tmp_label);
     }
     ADD_LABEL(ret, adjust_label);
     ADD_INSN(ret, line_node, putnil);
@@ -7140,51 +8370,55 @@ compile_loop(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE *const node, in
     if (tmp_label) ADD_LABEL(ret, tmp_label);
 
     ADD_LABEL(ret, redo_label);
-    branches = decl_branch_base(iseq, node, type == NODE_WHILE ? "while" : "until");
+    branches = decl_branch_base(iseq, PTR2NUM(node), nd_code_loc(node), type == NODE_WHILE ? "while" : "until");
+
+    const NODE *const coverage_node = RNODE_WHILE(node)->nd_body ? RNODE_WHILE(node)->nd_body : node;
     add_trace_branch_coverage(
         iseq,
-	ret,
-        node->nd_body ? node->nd_body : node,
+        ret,
+        nd_code_loc(coverage_node),
+        nd_node_id(coverage_node),
         0,
-	"body",
-	branches);
-    CHECK(COMPILE_POPPED(ret, "while body", node->nd_body));
+        "body",
+        branches);
+
+    CHECK(COMPILE_POPPED(ret, "while body", RNODE_WHILE(node)->nd_body));
     ADD_LABEL(ret, next_label);	/* next */
 
     if (type == NODE_WHILE) {
-	compile_branch_condition(iseq, ret, node->nd_cond,
-				 redo_label, end_label);
+        CHECK(compile_branch_condition(iseq, ret, RNODE_WHILE(node)->nd_cond,
+                                       redo_label, end_label));
     }
     else {
-	/* until */
-	compile_branch_condition(iseq, ret, node->nd_cond,
-				 end_label, redo_label);
+        /* until */
+        CHECK(compile_branch_condition(iseq, ret, RNODE_WHILE(node)->nd_cond,
+                                       end_label, redo_label));
     }
 
     ADD_LABEL(ret, end_label);
     ADD_ADJUST_RESTORE(ret, adjust_label);
 
-    if (node->nd_state == Qundef) {
-	/* ADD_INSN(ret, line_node, putundef); */
-	COMPILE_ERROR(ERROR_ARGS "unsupported: putundef");
-	return COMPILE_NG;
+    if (UNDEF_P(RNODE_WHILE(node)->nd_state)) {
+        /* ADD_INSN(ret, line_node, putundef); */
+        COMPILE_ERROR(ERROR_ARGS "unsupported: putundef");
+        return COMPILE_NG;
     }
     else {
-	ADD_INSN(ret, line_node, putnil);
+        ADD_INSN(ret, line_node, putnil);
     }
 
     ADD_LABEL(ret, break_label);	/* break */
 
     if (popped) {
-	ADD_INSN(ret, line_node, pop);
+        ADD_INSN(ret, line_node, pop);
     }
 
     ADD_CATCH_ENTRY(CATCH_TYPE_BREAK, redo_label, break_label, NULL,
-		    break_label);
+                    break_label);
     ADD_CATCH_ENTRY(CATCH_TYPE_NEXT, redo_label, break_label, NULL,
-		    next_catch_label);
+                    next_catch_label);
     ADD_CATCH_ENTRY(CATCH_TYPE_REDO, redo_label, break_label, NULL,
-		    ISEQ_COMPILE_DATA(iseq)->redo_label);
+                    ISEQ_COMPILE_DATA(iseq)->redo_label);
 
     ISEQ_COMPILE_DATA(iseq)->start_label = prev_start_label;
     ISEQ_COMPILE_DATA(iseq)->end_label = prev_end_label;
@@ -7206,23 +8440,46 @@ compile_iter(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE *const node, in
 
     ADD_LABEL(ret, retry_label);
     if (nd_type_p(node, NODE_FOR)) {
-	CHECK(COMPILE(ret, "iter caller (for)", node->nd_iter));
+        CHECK(COMPILE(ret, "iter caller (for)", RNODE_FOR(node)->nd_iter));
 
-	ISEQ_COMPILE_DATA(iseq)->current_block = child_iseq =
-	    NEW_CHILD_ISEQ(node->nd_body, make_name_for_block(iseq),
-			   ISEQ_TYPE_BLOCK, line);
-	ADD_SEND_WITH_BLOCK(ret, line_node, idEach, INT2FIX(0), child_iseq);
+        ISEQ_COMPILE_DATA(iseq)->current_block = child_iseq =
+            NEW_CHILD_ISEQ(RNODE_FOR(node)->nd_body, make_name_for_block(iseq),
+                           ISEQ_TYPE_BLOCK, line);
+        ADD_SEND_WITH_BLOCK(ret, line_node, idEach, INT2FIX(0), child_iseq);
     }
     else {
-	ISEQ_COMPILE_DATA(iseq)->current_block = child_iseq =
-	    NEW_CHILD_ISEQ(node->nd_body, make_name_for_block(iseq),
-			   ISEQ_TYPE_BLOCK, line);
-	CHECK(COMPILE(ret, "iter caller", node->nd_iter));
+        ISEQ_COMPILE_DATA(iseq)->current_block = child_iseq =
+            NEW_CHILD_ISEQ(RNODE_ITER(node)->nd_body, make_name_for_block(iseq),
+                           ISEQ_TYPE_BLOCK, line);
+        CHECK(COMPILE(ret, "iter caller", RNODE_ITER(node)->nd_iter));
+    }
+
+    {
+        // We need to put the label "retry_end_l" immediately after the last "send" instruction.
+        // This because vm_throw checks if the break cont is equal to the index of next insn of the "send".
+        // (Otherwise, it is considered "break from proc-closure". See "TAG_BREAK" handling in "vm_throw_start".)
+        //
+        // Normally, "send" instruction is at the last.
+        // However, qcall under branch coverage measurement adds some instructions after the "send".
+        //
+        // Note that "invokesuper", "invokesuperforward" appears instead of "send".
+        INSN *iobj;
+        LINK_ELEMENT *last_elem = LAST_ELEMENT(ret);
+        iobj = IS_INSN(last_elem) ? (INSN*) last_elem : (INSN*) get_prev_insn((INSN*) last_elem);
+        while (!IS_INSN_ID(iobj, send) && !IS_INSN_ID(iobj, invokesuper) && !IS_INSN_ID(iobj, sendforward) && !IS_INSN_ID(iobj, invokesuperforward)) {
+            iobj = (INSN*) get_prev_insn(iobj);
+        }
+        ELEM_INSERT_NEXT(&iobj->link, (LINK_ELEMENT*) retry_end_l);
+
+        // LINK_ANCHOR has a pointer to the last element, but ELEM_INSERT_NEXT does not update it
+        // even if we add an insn to the last of LINK_ANCHOR. So this updates it manually.
+        if (&iobj->link == LAST_ELEMENT(ret)) {
+            ret->last = (LINK_ELEMENT*) retry_end_l;
+        }
     }
-    ADD_LABEL(ret, retry_end_l);
 
     if (popped) {
-	ADD_INSN(ret, line_node, pop);
+        ADD_INSN(ret, line_node, pop);
     }
 
     ISEQ_COMPILE_DATA(iseq)->current_block = prevblock;
@@ -7238,7 +8495,7 @@ compile_for_masgn(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE *const nod
      * (args.length == 1 && Array.try_convert(args[0])) || args
      */
     const NODE *line_node = node;
-    const NODE *var = node->nd_var;
+    const NODE *var = RNODE_FOR_MASGN(node)->nd_var;
     LABEL *not_single = NEW_LABEL(nd_line(var));
     LABEL *not_ary = NEW_LABEL(nd_line(var));
     CHECK(COMPILE(ret, "for var", var));
@@ -7269,54 +8526,54 @@ compile_break(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE *const node, i
     unsigned long throw_flag = 0;
 
     if (ISEQ_COMPILE_DATA(iseq)->redo_label != 0 && can_add_ensure_iseq(iseq)) {
-	/* while/until */
-	LABEL *splabel = NEW_LABEL(0);
-	ADD_LABEL(ret, splabel);
-	ADD_ADJUST(ret, line_node, ISEQ_COMPILE_DATA(iseq)->redo_label);
-	CHECK(COMPILE_(ret, "break val (while/until)", node->nd_stts,
-		       ISEQ_COMPILE_DATA(iseq)->loopval_popped));
-	add_ensure_iseq(ret, iseq, 0);
-	ADD_INSNL(ret, line_node, jump, ISEQ_COMPILE_DATA(iseq)->end_label);
-	ADD_ADJUST_RESTORE(ret, splabel);
-
-	if (!popped) {
-	    ADD_INSN(ret, line_node, putnil);
-	}
+        /* while/until */
+        LABEL *splabel = NEW_LABEL(0);
+        ADD_LABEL(ret, splabel);
+        ADD_ADJUST(ret, line_node, ISEQ_COMPILE_DATA(iseq)->redo_label);
+        CHECK(COMPILE_(ret, "break val (while/until)", RNODE_BREAK(node)->nd_stts,
+                       ISEQ_COMPILE_DATA(iseq)->loopval_popped));
+        add_ensure_iseq(ret, iseq, 0);
+        ADD_INSNL(ret, line_node, jump, ISEQ_COMPILE_DATA(iseq)->end_label);
+        ADD_ADJUST_RESTORE(ret, splabel);
+
+        if (!popped) {
+            ADD_INSN(ret, line_node, putnil);
+        }
     }
     else {
         const rb_iseq_t *ip = iseq;
 
-	while (ip) {
-	    if (!ISEQ_COMPILE_DATA(ip)) {
-		ip = 0;
-		break;
-	    }
+        while (ip) {
+            if (!ISEQ_COMPILE_DATA(ip)) {
+                ip = 0;
+                break;
+            }
 
-	    if (ISEQ_COMPILE_DATA(ip)->redo_label != 0) {
+            if (ISEQ_COMPILE_DATA(ip)->redo_label != 0) {
                 throw_flag = VM_THROW_NO_ESCAPE_FLAG;
-	    }
+            }
             else if (ISEQ_BODY(ip)->type == ISEQ_TYPE_BLOCK) {
                 throw_flag = 0;
-	    }
+            }
             else if (ISEQ_BODY(ip)->type == ISEQ_TYPE_EVAL) {
                 COMPILE_ERROR(ERROR_ARGS "Can't escape from eval with break");
                 return COMPILE_NG;
-	    }
+            }
             else {
                 ip = ISEQ_BODY(ip)->parent_iseq;
                 continue;
             }
 
             /* escape from block */
-            CHECK(COMPILE(ret, "break val (block)", node->nd_stts));
+            CHECK(COMPILE(ret, "break val (block)", RNODE_BREAK(node)->nd_stts));
             ADD_INSN1(ret, line_node, throw, INT2FIX(throw_flag | TAG_BREAK));
             if (popped) {
                 ADD_INSN(ret, line_node, pop);
             }
             return COMPILE_OK;
-	}
-	COMPILE_ERROR(ERROR_ARGS "Invalid break");
-	return COMPILE_NG;
+        }
+        COMPILE_ERROR(ERROR_ARGS "Invalid break");
+        return COMPILE_NG;
     }
     return COMPILE_OK;
 }
@@ -7328,69 +8585,68 @@ compile_next(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE *const node, in
     unsigned long throw_flag = 0;
 
     if (ISEQ_COMPILE_DATA(iseq)->redo_label != 0 && can_add_ensure_iseq(iseq)) {
-	LABEL *splabel = NEW_LABEL(0);
-	debugs("next in while loop\n");
-	ADD_LABEL(ret, splabel);
-	CHECK(COMPILE(ret, "next val/valid syntax?", node->nd_stts));
-	add_ensure_iseq(ret, iseq, 0);
-	ADD_ADJUST(ret, line_node, ISEQ_COMPILE_DATA(iseq)->redo_label);
-	ADD_INSNL(ret, line_node, jump, ISEQ_COMPILE_DATA(iseq)->start_label);
-	ADD_ADJUST_RESTORE(ret, splabel);
-	if (!popped) {
-	    ADD_INSN(ret, line_node, putnil);
-	}
+        LABEL *splabel = NEW_LABEL(0);
+        debugs("next in while loop\n");
+        ADD_LABEL(ret, splabel);
+        CHECK(COMPILE(ret, "next val/valid syntax?", RNODE_NEXT(node)->nd_stts));
+        add_ensure_iseq(ret, iseq, 0);
+        ADD_ADJUST(ret, line_node, ISEQ_COMPILE_DATA(iseq)->redo_label);
+        ADD_INSNL(ret, line_node, jump, ISEQ_COMPILE_DATA(iseq)->start_label);
+        ADD_ADJUST_RESTORE(ret, splabel);
+        if (!popped) {
+            ADD_INSN(ret, line_node, putnil);
+        }
     }
     else if (ISEQ_COMPILE_DATA(iseq)->end_label && can_add_ensure_iseq(iseq)) {
-	LABEL *splabel = NEW_LABEL(0);
-	debugs("next in block\n");
-	ADD_LABEL(ret, splabel);
-	ADD_ADJUST(ret, line_node, ISEQ_COMPILE_DATA(iseq)->start_label);
-	CHECK(COMPILE(ret, "next val", node->nd_stts));
-	add_ensure_iseq(ret, iseq, 0);
-	ADD_INSNL(ret, line_node, jump, ISEQ_COMPILE_DATA(iseq)->end_label);
-	ADD_ADJUST_RESTORE(ret, splabel);
-	splabel->unremovable = FALSE;
-
-	if (!popped) {
-	    ADD_INSN(ret, line_node, putnil);
-	}
+        LABEL *splabel = NEW_LABEL(0);
+        debugs("next in block\n");
+        ADD_LABEL(ret, splabel);
+        ADD_ADJUST(ret, line_node, ISEQ_COMPILE_DATA(iseq)->start_label);
+        CHECK(COMPILE(ret, "next val", RNODE_NEXT(node)->nd_stts));
+        add_ensure_iseq(ret, iseq, 0);
+        ADD_INSNL(ret, line_node, jump, ISEQ_COMPILE_DATA(iseq)->end_label);
+        ADD_ADJUST_RESTORE(ret, splabel);
+
+        if (!popped) {
+            ADD_INSN(ret, line_node, putnil);
+        }
     }
     else {
-	const rb_iseq_t *ip = iseq;
+        const rb_iseq_t *ip = iseq;
 
-	while (ip) {
-	    if (!ISEQ_COMPILE_DATA(ip)) {
-		ip = 0;
-		break;
-	    }
+        while (ip) {
+            if (!ISEQ_COMPILE_DATA(ip)) {
+                ip = 0;
+                break;
+            }
 
             throw_flag = VM_THROW_NO_ESCAPE_FLAG;
-	    if (ISEQ_COMPILE_DATA(ip)->redo_label != 0) {
-		/* while loop */
-		break;
-	    }
+            if (ISEQ_COMPILE_DATA(ip)->redo_label != 0) {
+                /* while loop */
+                break;
+            }
             else if (ISEQ_BODY(ip)->type == ISEQ_TYPE_BLOCK) {
-		break;
-	    }
+                break;
+            }
             else if (ISEQ_BODY(ip)->type == ISEQ_TYPE_EVAL) {
                 COMPILE_ERROR(ERROR_ARGS "Can't escape from eval with next");
                 return COMPILE_NG;
-	    }
+            }
 
             ip = ISEQ_BODY(ip)->parent_iseq;
-	}
-	if (ip != 0) {
-	    CHECK(COMPILE(ret, "next val", node->nd_stts));
+        }
+        if (ip != 0) {
+            CHECK(COMPILE(ret, "next val", RNODE_NEXT(node)->nd_stts));
             ADD_INSN1(ret, line_node, throw, INT2FIX(throw_flag | TAG_NEXT));
 
-	    if (popped) {
-		ADD_INSN(ret, line_node, pop);
-	    }
-	}
-	else {
-	    COMPILE_ERROR(ERROR_ARGS "Invalid next");
-	    return COMPILE_NG;
-	}
+            if (popped) {
+                ADD_INSN(ret, line_node, pop);
+            }
+        }
+        else {
+            COMPILE_ERROR(ERROR_ARGS "Invalid next");
+            return COMPILE_NG;
+        }
     }
     return COMPILE_OK;
 }
@@ -7401,65 +8657,65 @@ compile_redo(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE *const node, in
     const NODE *line_node = node;
 
     if (ISEQ_COMPILE_DATA(iseq)->redo_label && can_add_ensure_iseq(iseq)) {
-	LABEL *splabel = NEW_LABEL(0);
-	debugs("redo in while");
-	ADD_LABEL(ret, splabel);
-	ADD_ADJUST(ret, line_node, ISEQ_COMPILE_DATA(iseq)->redo_label);
-	add_ensure_iseq(ret, iseq, 0);
-	ADD_INSNL(ret, line_node, jump, ISEQ_COMPILE_DATA(iseq)->redo_label);
-	ADD_ADJUST_RESTORE(ret, splabel);
-	if (!popped) {
-	    ADD_INSN(ret, line_node, putnil);
-	}
+        LABEL *splabel = NEW_LABEL(0);
+        debugs("redo in while");
+        ADD_LABEL(ret, splabel);
+        ADD_ADJUST(ret, line_node, ISEQ_COMPILE_DATA(iseq)->redo_label);
+        add_ensure_iseq(ret, iseq, 0);
+        ADD_INSNL(ret, line_node, jump, ISEQ_COMPILE_DATA(iseq)->redo_label);
+        ADD_ADJUST_RESTORE(ret, splabel);
+        if (!popped) {
+            ADD_INSN(ret, line_node, putnil);
+        }
     }
     else if (ISEQ_BODY(iseq)->type != ISEQ_TYPE_EVAL && ISEQ_COMPILE_DATA(iseq)->start_label && can_add_ensure_iseq(iseq)) {
-	LABEL *splabel = NEW_LABEL(0);
+        LABEL *splabel = NEW_LABEL(0);
 
-	debugs("redo in block");
-	ADD_LABEL(ret, splabel);
-	add_ensure_iseq(ret, iseq, 0);
-	ADD_ADJUST(ret, line_node, ISEQ_COMPILE_DATA(iseq)->start_label);
-	ADD_INSNL(ret, line_node, jump, ISEQ_COMPILE_DATA(iseq)->start_label);
-	ADD_ADJUST_RESTORE(ret, splabel);
+        debugs("redo in block");
+        ADD_LABEL(ret, splabel);
+        add_ensure_iseq(ret, iseq, 0);
+        ADD_ADJUST(ret, line_node, ISEQ_COMPILE_DATA(iseq)->start_label);
+        ADD_INSNL(ret, line_node, jump, ISEQ_COMPILE_DATA(iseq)->start_label);
+        ADD_ADJUST_RESTORE(ret, splabel);
 
-	if (!popped) {
-	    ADD_INSN(ret, line_node, putnil);
-	}
+        if (!popped) {
+            ADD_INSN(ret, line_node, putnil);
+        }
     }
     else {
-	const rb_iseq_t *ip = iseq;
+        const rb_iseq_t *ip = iseq;
 
-	while (ip) {
-	    if (!ISEQ_COMPILE_DATA(ip)) {
-		ip = 0;
-		break;
-	    }
+        while (ip) {
+            if (!ISEQ_COMPILE_DATA(ip)) {
+                ip = 0;
+                break;
+            }
 
-	    if (ISEQ_COMPILE_DATA(ip)->redo_label != 0) {
-		break;
-	    }
+            if (ISEQ_COMPILE_DATA(ip)->redo_label != 0) {
+                break;
+            }
             else if (ISEQ_BODY(ip)->type == ISEQ_TYPE_BLOCK) {
-		break;
-	    }
+                break;
+            }
             else if (ISEQ_BODY(ip)->type == ISEQ_TYPE_EVAL) {
                 COMPILE_ERROR(ERROR_ARGS "Can't escape from eval with redo");
                 return COMPILE_NG;
-	    }
+            }
 
             ip = ISEQ_BODY(ip)->parent_iseq;
-	}
-	if (ip != 0) {
-	    ADD_INSN(ret, line_node, putnil);
+        }
+        if (ip != 0) {
+            ADD_INSN(ret, line_node, putnil);
             ADD_INSN1(ret, line_node, throw, INT2FIX(VM_THROW_NO_ESCAPE_FLAG | TAG_REDO));
 
-	    if (popped) {
-		ADD_INSN(ret, line_node, pop);
-	    }
-	}
-	else {
-	    COMPILE_ERROR(ERROR_ARGS "Invalid redo");
-	    return COMPILE_NG;
-	}
+            if (popped) {
+                ADD_INSN(ret, line_node, pop);
+            }
+        }
+        else {
+            COMPILE_ERROR(ERROR_ARGS "Invalid redo");
+            return COMPILE_NG;
+        }
     }
     return COMPILE_OK;
 }
@@ -7470,16 +8726,16 @@ compile_retry(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE *const node, i
     const NODE *line_node = node;
 
     if (ISEQ_BODY(iseq)->type == ISEQ_TYPE_RESCUE) {
-	ADD_INSN(ret, line_node, putnil);
-	ADD_INSN1(ret, line_node, throw, INT2FIX(TAG_RETRY));
+        ADD_INSN(ret, line_node, putnil);
+        ADD_INSN1(ret, line_node, throw, INT2FIX(TAG_RETRY));
 
-	if (popped) {
-	    ADD_INSN(ret, line_node, pop);
-	}
+        if (popped) {
+            ADD_INSN(ret, line_node, pop);
+        }
     }
     else {
-	COMPILE_ERROR(ERROR_ARGS "Invalid retry");
-	return COMPILE_NG;
+        COMPILE_ERROR(ERROR_ARGS "Invalid retry");
+        return COMPILE_NG;
     }
     return COMPILE_OK;
 }
@@ -7492,7 +8748,7 @@ compile_rescue(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE *const node,
     LABEL *lstart = NEW_LABEL(line);
     LABEL *lend = NEW_LABEL(line);
     LABEL *lcont = NEW_LABEL(line);
-    const rb_iseq_t *rescue = NEW_CHILD_ISEQ(node->nd_resq,
+    const rb_iseq_t *rescue = NEW_CHILD_ISEQ(RNODE_RESCUE(node)->nd_resq,
                                              rb_str_concat(rb_str_new2("rescue in "),
                                                            ISEQ_BODY(iseq)->location.label),
                                              ISEQ_TYPE_RESCUE, line);
@@ -7504,20 +8760,20 @@ compile_rescue(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE *const node,
     bool prev_in_rescue = ISEQ_COMPILE_DATA(iseq)->in_rescue;
     ISEQ_COMPILE_DATA(iseq)->in_rescue = true;
     {
-        CHECK(COMPILE(ret, "rescue head", node->nd_head));
+        CHECK(COMPILE(ret, "rescue head", RNODE_RESCUE(node)->nd_head));
     }
     ISEQ_COMPILE_DATA(iseq)->in_rescue = prev_in_rescue;
 
     ADD_LABEL(ret, lend);
-    if (node->nd_else) {
-	ADD_INSN(ret, line_node, pop);
-	CHECK(COMPILE(ret, "rescue else", node->nd_else));
+    if (RNODE_RESCUE(node)->nd_else) {
+        ADD_INSN(ret, line_node, pop);
+        CHECK(COMPILE(ret, "rescue else", RNODE_RESCUE(node)->nd_else));
     }
     ADD_INSN(ret, line_node, nop);
     ADD_LABEL(ret, lcont);
 
     if (popped) {
-	ADD_INSN(ret, line_node, pop);
+        ADD_INSN(ret, line_node, pop);
     }
 
     /* register catch entry */
@@ -7536,48 +8792,61 @@ compile_resbody(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE *const node,
     LABEL *label_miss, *label_hit;
 
     while (resq) {
-	label_miss = NEW_LABEL(line);
-	label_hit = NEW_LABEL(line);
-
-	narg = resq->nd_args;
-	if (narg) {
-	    switch (nd_type(narg)) {
-	      case NODE_LIST:
-		while (narg) {
-		    ADD_GETLOCAL(ret, line_node, LVAR_ERRINFO, 0);
-		    CHECK(COMPILE(ret, "rescue arg", narg->nd_head));
-		    ADD_INSN1(ret, line_node, checkmatch, INT2FIX(VM_CHECKMATCH_TYPE_RESCUE));
-		    ADD_INSNL(ret, line_node, branchif, label_hit);
-		    narg = narg->nd_next;
-		}
-		break;
-	      case NODE_SPLAT:
-	      case NODE_ARGSCAT:
-	      case NODE_ARGSPUSH:
-		ADD_GETLOCAL(ret, line_node, LVAR_ERRINFO, 0);
-		CHECK(COMPILE(ret, "rescue/cond splat", narg));
-		ADD_INSN1(ret, line_node, checkmatch, INT2FIX(VM_CHECKMATCH_TYPE_RESCUE | VM_CHECKMATCH_ARRAY));
-		ADD_INSNL(ret, line_node, branchif, label_hit);
-		break;
-	      default:
-		UNKNOWN_NODE("NODE_RESBODY", narg, COMPILE_NG);
-	    }
-	}
-	else {
-	    ADD_GETLOCAL(ret, line_node, LVAR_ERRINFO, 0);
-	    ADD_INSN1(ret, line_node, putobject, rb_eStandardError);
-	    ADD_INSN1(ret, line_node, checkmatch, INT2FIX(VM_CHECKMATCH_TYPE_RESCUE));
-	    ADD_INSNL(ret, line_node, branchif, label_hit);
-	}
-	ADD_INSNL(ret, line_node, jump, label_miss);
-	ADD_LABEL(ret, label_hit);
-	CHECK(COMPILE(ret, "resbody body", resq->nd_body));
-	if (ISEQ_COMPILE_DATA(iseq)->option->tailcall_optimization) {
-	    ADD_INSN(ret, line_node, nop);
-	}
-	ADD_INSN(ret, line_node, leave);
-	ADD_LABEL(ret, label_miss);
-	resq = resq->nd_head;
+        label_miss = NEW_LABEL(line);
+        label_hit = NEW_LABEL(line);
+
+        narg = RNODE_RESBODY(resq)->nd_args;
+        if (narg) {
+            switch (nd_type(narg)) {
+              case NODE_LIST:
+                while (narg) {
+                    ADD_GETLOCAL(ret, line_node, LVAR_ERRINFO, 0);
+                    CHECK(COMPILE(ret, "rescue arg", RNODE_LIST(narg)->nd_head));
+                    ADD_INSN1(ret, line_node, checkmatch, INT2FIX(VM_CHECKMATCH_TYPE_RESCUE));
+                    ADD_INSNL(ret, line_node, branchif, label_hit);
+                    narg = RNODE_LIST(narg)->nd_next;
+                }
+                break;
+              case NODE_SPLAT:
+              case NODE_ARGSCAT:
+              case NODE_ARGSPUSH:
+                ADD_GETLOCAL(ret, line_node, LVAR_ERRINFO, 0);
+                CHECK(COMPILE(ret, "rescue/cond splat", narg));
+                ADD_INSN1(ret, line_node, checkmatch, INT2FIX(VM_CHECKMATCH_TYPE_RESCUE | VM_CHECKMATCH_ARRAY));
+                ADD_INSNL(ret, line_node, branchif, label_hit);
+                break;
+              default:
+                UNKNOWN_NODE("NODE_RESBODY", narg, COMPILE_NG);
+            }
+        }
+        else {
+            ADD_GETLOCAL(ret, line_node, LVAR_ERRINFO, 0);
+            ADD_INSN1(ret, line_node, putobject, rb_eStandardError);
+            ADD_INSN1(ret, line_node, checkmatch, INT2FIX(VM_CHECKMATCH_TYPE_RESCUE));
+            ADD_INSNL(ret, line_node, branchif, label_hit);
+        }
+        ADD_INSNL(ret, line_node, jump, label_miss);
+        ADD_LABEL(ret, label_hit);
+        ADD_TRACE(ret, RUBY_EVENT_RESCUE);
+
+        if (RNODE_RESBODY(resq)->nd_exc_var) {
+            CHECK(COMPILE_POPPED(ret, "resbody exc_var", RNODE_RESBODY(resq)->nd_exc_var));
+        }
+
+        if (nd_type(RNODE_RESBODY(resq)->nd_body) == NODE_BEGIN && RNODE_BEGIN(RNODE_RESBODY(resq)->nd_body)->nd_body == NULL && !RNODE_RESBODY(resq)->nd_exc_var) {
+            // empty body
+            ADD_SYNTHETIC_INSN(ret, nd_line(RNODE_RESBODY(resq)->nd_body), -1, putnil);
+        }
+        else {
+            CHECK(COMPILE(ret, "resbody body", RNODE_RESBODY(resq)->nd_body));
+        }
+
+        if (ISEQ_COMPILE_DATA(iseq)->option->tailcall_optimization) {
+            ADD_INSN(ret, line_node, nop);
+        }
+        ADD_INSN(ret, line_node, leave);
+        ADD_LABEL(ret, label_miss);
+        resq = RNODE_RESBODY(resq)->nd_next;
     }
     return COMPILE_OK;
 }
@@ -7585,12 +8854,12 @@ compile_resbody(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE *const node,
 static int
 compile_ensure(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE *const node, int popped)
 {
-    const int line = nd_line(node);
+    const int line = nd_line(RNODE_ENSURE(node)->nd_ensr);
     const NODE *line_node = node;
     DECL_ANCHOR(ensr);
-    const rb_iseq_t *ensure = NEW_CHILD_ISEQ(node->nd_ensr,
+    const rb_iseq_t *ensure = NEW_CHILD_ISEQ(RNODE_ENSURE(node)->nd_ensr,
                                              rb_str_concat(rb_str_new2 ("ensure in "), ISEQ_BODY(iseq)->location.label),
-					     ISEQ_TYPE_ENSURE, line);
+                                             ISEQ_TYPE_ENSURE, line);
     LABEL *lstart = NEW_LABEL(line);
     LABEL *lend = NEW_LABEL(line);
     LABEL *lcont = NEW_LABEL(line);
@@ -7601,17 +8870,17 @@ compile_ensure(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE *const node,
     struct ensure_range *erange;
 
     INIT_ANCHOR(ensr);
-    CHECK(COMPILE_POPPED(ensr, "ensure ensr", node->nd_ensr));
+    CHECK(COMPILE_POPPED(ensr, "ensure ensr", RNODE_ENSURE(node)->nd_ensr));
     last = ensr->last;
     last_leave = last && IS_INSN(last) && IS_INSN_ID(last, leave);
 
     er.begin = lstart;
     er.end = lend;
     er.next = 0;
-    push_ensure_entry(iseq, &enl, &er, node->nd_ensr);
+    push_ensure_entry(iseq, &enl, &er, RNODE_ENSURE(node)->nd_ensr);
 
     ADD_LABEL(ret, lstart);
-    CHECK(COMPILE_(ret, "ensure head", node->nd_head, (popped | last_leave)));
+    CHECK(COMPILE_(ret, "ensure head", RNODE_ENSURE(node)->nd_head, (popped | last_leave)));
     ADD_LABEL(ret, lend);
     ADD_SEQ(ret, ensr);
     if (!popped && last_leave) ADD_INSN(ret, line_node, putnil);
@@ -7620,11 +8889,11 @@ compile_ensure(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE *const node,
 
     erange = ISEQ_COMPILE_DATA(iseq)->ensure_node_stack->erange;
     if (lstart->link.next != &lend->link) {
-	while (erange) {
-	    ADD_CATCH_ENTRY(CATCH_TYPE_ENSURE, erange->begin, erange->end,
-			    ensure, lcont);
-	    erange = erange->next;
-	}
+        while (erange) {
+            ADD_CATCH_ENTRY(CATCH_TYPE_ENSURE, erange->begin, erange->end,
+                            ensure, lcont);
+            erange = erange->next;
+        }
     }
 
     ISEQ_COMPILE_DATA(iseq)->ensure_node_stack = enl.prev;
@@ -7637,59 +8906,80 @@ compile_return(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE *const node,
     const NODE *line_node = node;
 
     if (iseq) {
-        enum iseq_type type = ISEQ_BODY(iseq)->type;
-	const rb_iseq_t *is = iseq;
-	enum iseq_type t = type;
-	const NODE *retval = node->nd_stts;
-	LABEL *splabel = 0;
+        enum rb_iseq_type type = ISEQ_BODY(iseq)->type;
+        const rb_iseq_t *is = iseq;
+        enum rb_iseq_type t = type;
+        const NODE *retval = RNODE_RETURN(node)->nd_stts;
+        LABEL *splabel = 0;
 
-	while (t == ISEQ_TYPE_RESCUE || t == ISEQ_TYPE_ENSURE) {
+        while (t == ISEQ_TYPE_RESCUE || t == ISEQ_TYPE_ENSURE) {
             if (!(is = ISEQ_BODY(is)->parent_iseq)) break;
             t = ISEQ_BODY(is)->type;
-	}
-	switch (t) {
-	  case ISEQ_TYPE_TOP:
-	  case ISEQ_TYPE_MAIN:
+        }
+        switch (t) {
+          case ISEQ_TYPE_TOP:
+          case ISEQ_TYPE_MAIN:
             if (retval) {
                 rb_warn("argument of top-level return is ignored");
             }
-	    if (is == iseq) {
-		/* plain top-level, leave directly */
-		type = ISEQ_TYPE_METHOD;
-	    }
-	    break;
-	  default:
-	    break;
-	}
-
-	if (type == ISEQ_TYPE_METHOD) {
-	    splabel = NEW_LABEL(0);
-	    ADD_LABEL(ret, splabel);
-	    ADD_ADJUST(ret, line_node, 0);
-	}
-
-	CHECK(COMPILE(ret, "return nd_stts (return val)", retval));
-
-	if (type == ISEQ_TYPE_METHOD && can_add_ensure_iseq(iseq)) {
-	    add_ensure_iseq(ret, iseq, 1);
-	    ADD_TRACE(ret, RUBY_EVENT_RETURN);
-	    ADD_INSN(ret, line_node, leave);
-	    ADD_ADJUST_RESTORE(ret, splabel);
-
-	    if (!popped) {
-		ADD_INSN(ret, line_node, putnil);
-	    }
-	}
-	else {
-	    ADD_INSN1(ret, line_node, throw, INT2FIX(TAG_RETURN));
-	    if (popped) {
-		ADD_INSN(ret, line_node, pop);
-	    }
-	}
+            if (is == iseq) {
+                /* plain top-level, leave directly */
+                type = ISEQ_TYPE_METHOD;
+            }
+            break;
+          default:
+            break;
+        }
+
+        if (type == ISEQ_TYPE_METHOD) {
+            splabel = NEW_LABEL(0);
+            ADD_LABEL(ret, splabel);
+            ADD_ADJUST(ret, line_node, 0);
+        }
+
+        CHECK(COMPILE(ret, "return nd_stts (return val)", retval));
+
+        if (type == ISEQ_TYPE_METHOD && can_add_ensure_iseq(iseq)) {
+            add_ensure_iseq(ret, iseq, 1);
+            ADD_TRACE(ret, RUBY_EVENT_RETURN);
+            ADD_INSN(ret, line_node, leave);
+            ADD_ADJUST_RESTORE(ret, splabel);
+
+            if (!popped) {
+                ADD_INSN(ret, line_node, putnil);
+            }
+        }
+        else {
+            ADD_INSN1(ret, line_node, throw, INT2FIX(TAG_RETURN));
+            if (popped) {
+                ADD_INSN(ret, line_node, pop);
+            }
+        }
     }
     return COMPILE_OK;
 }
 
+static bool
+drop_unreachable_return(LINK_ANCHOR *ret)
+{
+    LINK_ELEMENT *i = ret->last, *last;
+    if (!i) return false;
+    if (IS_TRACE(i)) i = i->prev;
+    if (!IS_INSN(i) || !IS_INSN_ID(i, putnil)) return false;
+    last = i = i->prev;
+    if (IS_ADJUST(i)) i = i->prev;
+    if (!IS_INSN(i)) return false;
+    switch (INSN_OF(i)) {
+      case BIN(leave):
+      case BIN(jump):
+        break;
+      default:
+        return false;
+    }
+    (ret->last = last->prev)->next = NULL;
+    return true;
+}
+
 static int
 compile_evstr(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE *const node, int popped)
 {
@@ -7697,7 +8987,7 @@ compile_evstr(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE *const node, i
 
     if (!popped && !all_string_result_p(node)) {
         const NODE *line_node = node;
-	const unsigned int flag = VM_CALL_FCALL;
+        const unsigned int flag = VM_CALL_FCALL;
 
         // Note, this dup could be removed if we are willing to change anytostring. It pops
         // two VALUEs off the stack when it could work by replacing the top most VALUE.
@@ -7723,11 +9013,11 @@ qcall_branch_start(rb_iseq_t *iseq, LINK_ANCHOR *const recv, VALUE *branches, co
     LABEL *else_label = NEW_LABEL(nd_line(line_node));
     VALUE br = 0;
 
-    br = decl_branch_base(iseq, node, "&.");
+    br = decl_branch_base(iseq, PTR2NUM(node), nd_code_loc(node), "&.");
     *branches = br;
     ADD_INSN(recv, line_node, dup);
     ADD_INSNL(recv, line_node, branchnil, else_label);
-    add_trace_branch_coverage(iseq, recv, node, 0, "then", br);
+    add_trace_branch_coverage(iseq, recv, nd_code_loc(node), nd_node_id(node), 0, "then", br);
     return else_label;
 }
 
@@ -7739,7 +9029,7 @@ qcall_branch_end(rb_iseq_t *iseq, LINK_ANCHOR *const ret, LABEL *else_label, VAL
     end_label = NEW_LABEL(nd_line(line_node));
     ADD_INSNL(ret, line_node, jump, end_label);
     ADD_LABEL(ret, else_label);
-    add_trace_branch_coverage(iseq, ret, node, 1, "else", branches);
+    add_trace_branch_coverage(iseq, ret, nd_code_loc(node), nd_node_id(node), 1, "else", branches);
     ADD_LABEL(ret, end_label);
 }
 
@@ -7749,13 +9039,14 @@ compile_call_precheck_freeze(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE
     /* optimization shortcut
      *   "literal".freeze -> opt_str_freeze("literal")
      */
-    if (node->nd_recv && nd_type_p(node->nd_recv, NODE_STR) &&
-        (node->nd_mid == idFreeze || node->nd_mid == idUMinus) &&
-        node->nd_args == NULL &&
+    if (get_nd_recv(node) &&
+        (nd_type_p(get_nd_recv(node), NODE_STR) || nd_type_p(get_nd_recv(node), NODE_FILE)) &&
+        (get_node_call_nd_mid(node) == idFreeze || get_node_call_nd_mid(node) == idUMinus) &&
+        get_nd_args(node) == NULL &&
         ISEQ_COMPILE_DATA(iseq)->current_block == NULL &&
         ISEQ_COMPILE_DATA(iseq)->option->specialized_instruction) {
-        VALUE str = rb_fstring(node->nd_recv->nd_lit);
-        if (node->nd_mid == idUMinus) {
+        VALUE str = get_string_value(get_nd_recv(node));
+        if (get_node_call_nd_mid(node) == idUMinus) {
             ADD_INSN2(ret, line_node, opt_str_uminus, str,
                       new_callinfo(iseq, idUMinus, 0, 0, NULL, FALSE));
         }
@@ -7769,25 +9060,6 @@ compile_call_precheck_freeze(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE
         }
         return TRUE;
     }
-    /* optimization shortcut
-     *   obj["literal"] -> opt_aref_with(obj, "literal")
-     */
-    if (node->nd_mid == idAREF && !private_recv_p(node) && node->nd_args &&
-        nd_type_p(node->nd_args, NODE_LIST) && node->nd_args->nd_alen == 1 &&
-        nd_type_p(node->nd_args->nd_head, NODE_STR) &&
-        ISEQ_COMPILE_DATA(iseq)->current_block == NULL &&
-        !ISEQ_COMPILE_DATA(iseq)->option->frozen_string_literal &&
-        ISEQ_COMPILE_DATA(iseq)->option->specialized_instruction) {
-        VALUE str = rb_fstring(node->nd_args->nd_head->nd_lit);
-        CHECK(COMPILE(ret, "recv", node->nd_recv));
-        ADD_INSN2(ret, line_node, opt_aref_with, str,
-                  new_callinfo(iseq, idAREF, 1, 0, NULL, FALSE));
-        RB_OBJ_WRITTEN(iseq, Qundef, str);
-        if (popped) {
-            ADD_INSN(ret, line_node, pop);
-        }
-        return TRUE;
-    }
     return FALSE;
 }
 
@@ -7822,12 +9094,12 @@ iseq_builtin_function_name(const enum node_type type, const NODE *recv, ID mid)
         if (recv) {
             switch (nd_type(recv)) {
               case NODE_VCALL:
-                if (recv->nd_mid == rb_intern("__builtin")) {
+                if (RNODE_VCALL(recv)->nd_mid == rb_intern("__builtin")) {
                     return name;
                 }
                 break;
               case NODE_CONST:
-                if (recv->nd_vid == rb_intern("Primitive")) {
+                if (RNODE_CONST(recv)->nd_vid == rb_intern("Primitive")) {
                     return name;
                 }
                 break;
@@ -7908,16 +9180,79 @@ delegate_call_p(const rb_iseq_t *iseq, unsigned int argc, const LINK_ANCHOR *arg
     }
 }
 
+// Compile Primitive.attr! :leaf, ...
+static int
+compile_builtin_attr(rb_iseq_t *iseq, const NODE *node)
+{
+    VALUE symbol;
+    VALUE string;
+    if (!node) goto no_arg;
+    while (node) {
+        if (!nd_type_p(node, NODE_LIST)) goto bad_arg;
+        const NODE *next = RNODE_LIST(node)->nd_next;
+
+        node = RNODE_LIST(node)->nd_head;
+        if (!node) goto no_arg;
+        switch (nd_type(node)) {
+          case NODE_SYM:
+            symbol = rb_node_sym_string_val(node);
+            break;
+          default:
+            goto bad_arg;
+        }
+
+        if (!SYMBOL_P(symbol)) goto non_symbol_arg;
+
+        string = rb_sym2str(symbol);
+        if (strcmp(RSTRING_PTR(string), "leaf") == 0) {
+            ISEQ_BODY(iseq)->builtin_attrs |= BUILTIN_ATTR_LEAF;
+        }
+        else if (strcmp(RSTRING_PTR(string), "inline_block") == 0) {
+            ISEQ_BODY(iseq)->builtin_attrs |= BUILTIN_ATTR_INLINE_BLOCK;
+        }
+        else if (strcmp(RSTRING_PTR(string), "use_block") == 0) {
+            iseq_set_use_block(iseq);
+        }
+        else if (strcmp(RSTRING_PTR(string), "c_trace") == 0) {
+            // Let the iseq act like a C method in backtraces
+            ISEQ_BODY(iseq)->builtin_attrs |= BUILTIN_ATTR_C_TRACE;
+        }
+        else {
+            goto unknown_arg;
+        }
+        node = next;
+    }
+    return COMPILE_OK;
+  no_arg:
+    COMPILE_ERROR(ERROR_ARGS "attr!: no argument");
+    return COMPILE_NG;
+  non_symbol_arg:
+    COMPILE_ERROR(ERROR_ARGS "non symbol argument to attr!: %s", rb_builtin_class_name(symbol));
+    return COMPILE_NG;
+  unknown_arg:
+    COMPILE_ERROR(ERROR_ARGS "unknown argument to attr!: %s", RSTRING_PTR(string));
+    return COMPILE_NG;
+  bad_arg:
+    UNKNOWN_NODE("attr!", node, COMPILE_NG);
+}
+
 static int
 compile_builtin_arg(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE *node, const NODE *line_node, int popped)
 {
+    VALUE name;
+
     if (!node) goto no_arg;
     if (!nd_type_p(node, NODE_LIST)) goto bad_arg;
-    if (node->nd_next) goto too_many_arg;
-    node = node->nd_head;
+    if (RNODE_LIST(node)->nd_next) goto too_many_arg;
+    node = RNODE_LIST(node)->nd_head;
     if (!node) goto no_arg;
-    if (!nd_type_p(node, NODE_LIT)) goto bad_arg;
-    VALUE name = node->nd_lit;
+    switch (nd_type(node)) {
+      case NODE_SYM:
+        name = rb_node_sym_string_val(node);
+        break;
+      default:
+        goto bad_arg;
+    }
     if (!SYMBOL_P(name)) goto non_symbol_arg;
     if (!popped) {
         compile_lvar(iseq, ret, line_node, SYM2ID(name));
@@ -7941,8 +9276,8 @@ static NODE *
 mandatory_node(const rb_iseq_t *iseq, const NODE *cond_node)
 {
     const NODE *node = ISEQ_COMPILE_DATA(iseq)->root_node;
-    if (nd_type(node) == NODE_IF && node->nd_cond == cond_node) {
-        return node->nd_body;
+    if (nd_type(node) == NODE_IF && RNODE_IF(node)->nd_cond == cond_node) {
+        return RNODE_IF(node)->nd_body;
     }
     else {
         rb_bug("mandatory_node: can't find mandatory node");
@@ -7956,8 +9291,9 @@ compile_builtin_mandatory_only_method(rb_iseq_t *iseq, const NODE *node, const N
     struct rb_args_info args = {
         .pre_args_num = ISEQ_BODY(iseq)->param.lead_num,
     };
-    NODE args_node;
-    rb_node_init(&args_node, NODE_ARGS, 0, 0, (VALUE)&args);
+    rb_node_args_t args_node;
+    rb_node_init(RNODE(&args_node), NODE_ARGS);
+    args_node.nd_ainfo = args;
 
     // local table without non-mandatory parameters
     const int skip_local_size = ISEQ_BODY(iseq)->param.size - ISEQ_BODY(iseq)->param.lead_num;
@@ -7978,24 +9314,23 @@ compile_builtin_mandatory_only_method(rb_iseq_t *iseq, const NODE *node, const N
         tbl->ids[i] = ISEQ_BODY(iseq)->local_table[i + skip_local_size];
     }
 
-    NODE scope_node;
-    rb_node_init(&scope_node, NODE_SCOPE, (VALUE)tbl, (VALUE)mandatory_node(iseq, node), (VALUE)&args_node);
-
-    rb_ast_body_t ast = {
-        .root = &scope_node,
-        .compile_option = 0,
-        .script_lines = ISEQ_BODY(iseq)->variable.script_lines,
-    };
+    rb_node_scope_t scope_node;
+    rb_node_init(RNODE(&scope_node), NODE_SCOPE);
+    scope_node.nd_tbl = tbl;
+    scope_node.nd_body = mandatory_node(iseq, node);
+    scope_node.nd_parent = NULL;
+    scope_node.nd_args = &args_node;
 
-    int prev_inline_index = GET_VM()->builtin_inline_index;
+    VALUE ast_value = rb_ruby_ast_new(RNODE(&scope_node));
 
-    ISEQ_BODY(iseq)->mandatory_only_iseq =
-      rb_iseq_new_with_opt(&ast, rb_iseq_base_label(iseq),
+    const rb_iseq_t *mandatory_only_iseq =
+      rb_iseq_new_with_opt(ast_value, rb_iseq_base_label(iseq),
                            rb_iseq_path(iseq), rb_iseq_realpath(iseq),
-                           INT2FIX(nd_line(line_node)), NULL, 0,
-                           ISEQ_TYPE_METHOD, ISEQ_COMPILE_DATA(iseq)->option);
+                           nd_line(line_node), NULL, 0,
+                           ISEQ_TYPE_METHOD, ISEQ_COMPILE_DATA(iseq)->option,
+                           ISEQ_BODY(iseq)->variable.script_lines);
+    RB_OBJ_WRITE(iseq, &ISEQ_BODY(iseq)->mandatory_only_iseq, (VALUE)mandatory_only_iseq);
 
-    GET_VM()->builtin_inline_index = prev_inline_index;
     ALLOCV_END(idtmp);
     return COMPILE_OK;
 }
@@ -8004,15 +9339,15 @@ static int
 compile_builtin_function_call(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE *const node, const NODE *line_node, int popped,
                               const rb_iseq_t *parent_block, LINK_ANCHOR *args, const char *builtin_func)
 {
-    NODE *args_node = node->nd_args;
+    NODE *args_node = get_nd_args(node);
 
     if (parent_block != NULL) {
-        COMPILE_ERROR(iseq, nd_line(line_node), "should not call builtins here.");
+        COMPILE_ERROR(ERROR_ARGS_AT(line_node) "should not call builtins here.");
         return COMPILE_NG;
     }
     else {
 # define BUILTIN_INLINE_PREFIX "_bi"
-        char inline_func[DECIMAL_SIZE_OF_BITS(sizeof(int) * CHAR_BIT) + sizeof(BUILTIN_INLINE_PREFIX)];
+        char inline_func[sizeof(BUILTIN_INLINE_PREFIX) + DECIMAL_SIZE_OF(int)];
         bool cconst = false;
       retry:;
         const struct rb_builtin_function *bf = iseq_builtin_function_lookup(iseq, builtin_func);
@@ -8027,13 +9362,10 @@ compile_builtin_function_call(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NOD
             }
             else if (strcmp("cinit!", builtin_func) == 0) {
                 // ignore
-                GET_VM()->builtin_inline_index++;
                 return COMPILE_OK;
             }
             else if (strcmp("attr!", builtin_func) == 0) {
-                // There's only "inline" attribute for now
-                ISEQ_BODY(iseq)->builtin_inline_p = true;
-                return COMPILE_OK;
+                return compile_builtin_attr(iseq, args_node);
             }
             else if (strcmp("arg!", builtin_func) == 0) {
                 return compile_builtin_arg(iseq, ret, args_node, line_node, popped);
@@ -8057,10 +9389,7 @@ compile_builtin_function_call(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NOD
                 return COMPILE_NG;
             }
 
-            if (GET_VM()->builtin_inline_index == INT_MAX) {
-                rb_bug("builtin inline function index overflow:%s", builtin_func);
-            }
-            int inline_index = GET_VM()->builtin_inline_index++;
+            int inline_index = nd_line(node);
             snprintf(inline_func, sizeof(inline_func), BUILTIN_INLINE_PREFIX "%d", inline_index);
             builtin_func = inline_func;
             args_node = NULL;
@@ -8069,7 +9398,7 @@ compile_builtin_function_call(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NOD
 
         if (cconst) {
             typedef VALUE(*builtin_func0)(void *, VALUE);
-            VALUE const_val = (*(builtin_func0)bf->func_ptr)(NULL, Qnil);
+            VALUE const_val = (*(builtin_func0)(uintptr_t)bf->func_ptr)(NULL, Qnil);
             ADD_INSN1(ret, line_node, putobject, const_val);
             return COMPILE_OK;
         }
@@ -8109,7 +9438,7 @@ compile_call(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE *const node, co
      */
     DECL_ANCHOR(recv);
     DECL_ANCHOR(args);
-    ID mid = node->nd_mid;
+    ID mid = get_node_call_nd_mid(node);
     VALUE argc;
     unsigned int flag = 0;
     struct rb_callinfo_kwarg *keywords = NULL;
@@ -8121,6 +9450,7 @@ compile_call(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE *const node, co
 
     INIT_ANCHOR(recv);
     INIT_ANCHOR(args);
+
 #if OPT_SUPPORT_JOKE
     if (nd_type_p(node, NODE_VCALL)) {
         ID id_bitblt;
@@ -8157,20 +9487,7 @@ compile_call(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE *const node, co
                 labels_table = st_init_numtable();
                 ISEQ_COMPILE_DATA(iseq)->labels_table = labels_table;
             }
-            if (nd_type_p(node->nd_args->nd_head, NODE_LIT) &&
-                SYMBOL_P(node->nd_args->nd_head->nd_lit)) {
-
-                label_name = node->nd_args->nd_head->nd_lit;
-                if (!st_lookup(labels_table, (st_data_t)label_name, &data)) {
-                    label = NEW_LABEL(nd_line(line_node));
-                    label->position = nd_line(line_node);
-                    st_insert(labels_table, (st_data_t)label_name, (st_data_t)label);
-                }
-                else {
-                    label = (LABEL *)data;
-                }
-            }
-            else {
+            {
                 COMPILE_ERROR(ERROR_ARGS "invalid goto/label format");
                 return COMPILE_NG;
             }
@@ -8188,7 +9505,7 @@ compile_call(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE *const node, co
 
     const char *builtin_func;
     if (UNLIKELY(iseq_has_builtin_function_table(iseq)) &&
-        (builtin_func = iseq_builtin_function_name(type, node->nd_recv, mid)) != NULL) {
+        (builtin_func = iseq_builtin_function_name(type, get_nd_recv(node), mid)) != NULL) {
         return compile_builtin_function_call(iseq, ret, node, line_node, popped, parent_block, args, builtin_func);
     }
 
@@ -8198,16 +9515,16 @@ compile_call(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE *const node, co
             int idx, level;
 
             if (mid == idCall &&
-                nd_type_p(node->nd_recv, NODE_LVAR) &&
-                iseq_block_param_id_p(iseq, node->nd_recv->nd_vid, &idx, &level)) {
-                ADD_INSN2(recv, node->nd_recv, getblockparamproxy, INT2FIX(idx + VM_ENV_DATA_SIZE - 1), INT2FIX(level));
+                nd_type_p(get_nd_recv(node), NODE_LVAR) &&
+                iseq_block_param_id_p(iseq, RNODE_LVAR(get_nd_recv(node))->nd_vid, &idx, &level)) {
+                ADD_INSN2(recv, get_nd_recv(node), getblockparamproxy, INT2FIX(idx + VM_ENV_DATA_SIZE - 1), INT2FIX(level));
             }
             else if (private_recv_p(node)) {
                 ADD_INSN(recv, node, putself);
                 flag |= VM_CALL_FCALL;
             }
             else {
-                CHECK(COMPILE(recv, "recv", node->nd_recv));
+                CHECK(COMPILE(recv, "recv", get_nd_recv(node)));
             }
 
             if (type == NODE_QCALL) {
@@ -8221,7 +9538,7 @@ compile_call(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE *const node, co
 
     /* args */
     if (type != NODE_VCALL) {
-        argc = setup_args(iseq, args, node->nd_args, &flag, &keywords);
+        argc = setup_args(iseq, args, get_nd_args(node), &flag, &keywords);
         CHECK(!NIL_P(argc));
     }
     else {
@@ -8229,6 +9546,17 @@ compile_call(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE *const node, co
     }
 
     ADD_SEQ(ret, recv);
+
+    bool inline_new = ISEQ_COMPILE_DATA(iseq)->option->specialized_instruction &&
+        mid == rb_intern("new") &&
+        parent_block == NULL &&
+        !(flag & VM_CALL_ARGS_BLOCKARG);
+
+    if (inline_new) {
+        ADD_INSN(ret, node, putnil);
+        ADD_INSN(ret, node, swap);
+    }
+
     ADD_SEQ(ret, args);
 
     debugp_param("call args argc", argc);
@@ -8242,7 +9570,40 @@ compile_call(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE *const node, co
         flag |= VM_CALL_FCALL;
     }
 
-    ADD_SEND_R(ret, line_node, mid, argc, parent_block, INT2FIX(flag), keywords);
+    if ((flag & VM_CALL_ARGS_BLOCKARG) && (flag & VM_CALL_KW_SPLAT) && !(flag & VM_CALL_KW_SPLAT_MUT)) {
+        ADD_INSN(ret, line_node, splatkw);
+    }
+
+    LABEL *not_basic_new = NEW_LABEL(nd_line(node));
+    LABEL *not_basic_new_finish = NEW_LABEL(nd_line(node));
+
+    if (inline_new) {
+        // Jump unless the receiver uses the "basic" implementation of "new"
+        VALUE ci;
+        if (flag & VM_CALL_FORWARDING) {
+            ci = (VALUE)new_callinfo(iseq, mid, NUM2INT(argc) + 1, flag, keywords, 0);
+        }
+        else {
+            ci = (VALUE)new_callinfo(iseq, mid, NUM2INT(argc), flag, keywords, 0);
+        }
+        ADD_INSN2(ret, node, opt_new, ci, not_basic_new);
+        LABEL_REF(not_basic_new);
+
+        // optimized path
+        ADD_SEND_R(ret, line_node, rb_intern("initialize"), argc, parent_block, INT2FIX(flag | VM_CALL_FCALL), keywords);
+        ADD_INSNL(ret, line_node, jump, not_basic_new_finish);
+
+        ADD_LABEL(ret, not_basic_new);
+        // Fall back to normal send
+        ADD_SEND_R(ret, line_node, mid, argc, parent_block, INT2FIX(flag), keywords);
+        ADD_INSN(ret, line_node, swap);
+
+        ADD_LABEL(ret, not_basic_new_finish);
+        ADD_INSN(ret, line_node, pop);
+    }
+    else {
+        ADD_SEND_R(ret, line_node, mid, argc, parent_block, INT2FIX(flag), keywords);
+    }
 
     qcall_branch_end(iseq, ret, else_label, branches, node, line_node);
     if (popped) {
@@ -8258,8 +9619,7 @@ compile_op_asgn1(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE *const node
     VALUE argc;
     unsigned int flag = 0;
     int asgnflag = 0;
-    ID id = node->nd_mid;
-    int boff = 0;
+    ID id = RNODE_OP_ASGN1(node)->nd_mid;
 
     /*
      * a[x] (op)= y
@@ -8285,106 +9645,103 @@ compile_op_asgn1(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE *const node
      */
 
     if (!popped) {
-	ADD_INSN(ret, node, putnil);
+        ADD_INSN(ret, node, putnil);
     }
-    asgnflag = COMPILE_RECV(ret, "NODE_OP_ASGN1 recv", node);
+    asgnflag = COMPILE_RECV(ret, "NODE_OP_ASGN1 recv", node, RNODE_OP_ASGN1(node)->nd_recv);
     CHECK(asgnflag != -1);
-    switch (nd_type(node->nd_args->nd_head)) {
+    switch (nd_type(RNODE_OP_ASGN1(node)->nd_index)) {
       case NODE_ZLIST:
-	argc = INT2FIX(0);
-	break;
-      case NODE_BLOCK_PASS:
-	boff = 1;
-	/* fall through */
+        argc = INT2FIX(0);
+        break;
       default:
-	argc = setup_args(iseq, ret, node->nd_args->nd_head, &flag, NULL);
-	CHECK(!NIL_P(argc));
+        argc = setup_args(iseq, ret, RNODE_OP_ASGN1(node)->nd_index, &flag, NULL);
+        CHECK(!NIL_P(argc));
     }
-    ADD_INSN1(ret, node, dupn, FIXNUM_INC(argc, 1 + boff));
+    int dup_argn = FIX2INT(argc) + 1;
+    ADD_INSN1(ret, node, dupn, INT2FIX(dup_argn));
     flag |= asgnflag;
-    ADD_SEND_WITH_FLAG(ret, node, idAREF, argc, INT2FIX(flag));
+    ADD_SEND_R(ret, node, idAREF, argc, NULL, INT2FIX(flag & ~VM_CALL_ARGS_SPLAT_MUT), NULL);
 
     if (id == idOROP || id == idANDOP) {
-	/* a[x] ||= y  or  a[x] &&= y
-
-	   unless/if a[x]
-	   a[x]= y
-	   else
-	   nil
-	   end
-	*/
-	LABEL *label = NEW_LABEL(line);
-	LABEL *lfin = NEW_LABEL(line);
-
-	ADD_INSN(ret, node, dup);
-	if (id == idOROP) {
-	    ADD_INSNL(ret, node, branchif, label);
-	}
-	else { /* idANDOP */
-	    ADD_INSNL(ret, node, branchunless, label);
-	}
-	ADD_INSN(ret, node, pop);
-
-	CHECK(COMPILE(ret, "NODE_OP_ASGN1 args->body: ", node->nd_args->nd_body));
-	if (!popped) {
-	    ADD_INSN1(ret, node, setn, FIXNUM_INC(argc, 2+boff));
-	}
-	if (flag & VM_CALL_ARGS_SPLAT) {
-	    ADD_INSN1(ret, node, newarray, INT2FIX(1));
-	    if (boff > 0) {
-		ADD_INSN1(ret, node, dupn, INT2FIX(3));
-		ADD_INSN(ret, node, swap);
-		ADD_INSN(ret, node, pop);
-	    }
-	    ADD_INSN(ret, node, concatarray);
-	    if (boff > 0) {
-		ADD_INSN1(ret, node, setn, INT2FIX(3));
-		ADD_INSN(ret, node, pop);
-		ADD_INSN(ret, node, pop);
-	    }
-	    ADD_SEND_WITH_FLAG(ret, node, idASET, argc, INT2FIX(flag));
-	}
-	else {
-	    if (boff > 0)
-		ADD_INSN(ret, node, swap);
-	    ADD_SEND_WITH_FLAG(ret, node, idASET, FIXNUM_INC(argc, 1), INT2FIX(flag));
-	}
-	ADD_INSN(ret, node, pop);
-	ADD_INSNL(ret, node, jump, lfin);
-	ADD_LABEL(ret, label);
-	if (!popped) {
-	    ADD_INSN1(ret, node, setn, FIXNUM_INC(argc, 2+boff));
-	}
-	ADD_INSN1(ret, node, adjuststack, FIXNUM_INC(argc, 2+boff));
-	ADD_LABEL(ret, lfin);
+        /* a[x] ||= y  or  a[x] &&= y
+
+           unless/if a[x]
+           a[x]= y
+           else
+           nil
+           end
+        */
+        LABEL *label = NEW_LABEL(line);
+        LABEL *lfin = NEW_LABEL(line);
+
+        ADD_INSN(ret, node, dup);
+        if (id == idOROP) {
+            ADD_INSNL(ret, node, branchif, label);
+        }
+        else { /* idANDOP */
+            ADD_INSNL(ret, node, branchunless, label);
+        }
+        ADD_INSN(ret, node, pop);
+
+        CHECK(COMPILE(ret, "NODE_OP_ASGN1 nd_rvalue: ", RNODE_OP_ASGN1(node)->nd_rvalue));
+        if (!popped) {
+            ADD_INSN1(ret, node, setn, INT2FIX(dup_argn+1));
+        }
+        if (flag & VM_CALL_ARGS_SPLAT) {
+            if (!(flag & VM_CALL_ARGS_SPLAT_MUT)) {
+                ADD_INSN(ret, node, swap);
+                ADD_INSN1(ret, node, splatarray, Qtrue);
+                ADD_INSN(ret, node, swap);
+                flag |= VM_CALL_ARGS_SPLAT_MUT;
+            }
+            ADD_INSN1(ret, node, pushtoarray, INT2FIX(1));
+            ADD_SEND_R(ret, node, idASET, argc, NULL, INT2FIX(flag), NULL);
+        }
+        else {
+            ADD_SEND_R(ret, node, idASET, FIXNUM_INC(argc, 1), NULL, INT2FIX(flag), NULL);
+        }
+        ADD_INSN(ret, node, pop);
+        ADD_INSNL(ret, node, jump, lfin);
+        ADD_LABEL(ret, label);
+        if (!popped) {
+            ADD_INSN1(ret, node, setn, INT2FIX(dup_argn+1));
+        }
+        ADD_INSN1(ret, node, adjuststack, INT2FIX(dup_argn+1));
+        ADD_LABEL(ret, lfin);
     }
     else {
-	CHECK(COMPILE(ret, "NODE_OP_ASGN1 args->body: ", node->nd_args->nd_body));
-	ADD_SEND(ret, node, id, INT2FIX(1));
-	if (!popped) {
-	    ADD_INSN1(ret, node, setn, FIXNUM_INC(argc, 2+boff));
-	}
-	if (flag & VM_CALL_ARGS_SPLAT) {
-	    ADD_INSN1(ret, node, newarray, INT2FIX(1));
-	    if (boff > 0) {
-		ADD_INSN1(ret, node, dupn, INT2FIX(3));
-		ADD_INSN(ret, node, swap);
-		ADD_INSN(ret, node, pop);
-	    }
-	    ADD_INSN(ret, node, concatarray);
-	    if (boff > 0) {
-		ADD_INSN1(ret, node, setn, INT2FIX(3));
-		ADD_INSN(ret, node, pop);
-		ADD_INSN(ret, node, pop);
-	    }
-	    ADD_SEND_WITH_FLAG(ret, node, idASET, argc, INT2FIX(flag));
-	}
-	else {
-	    if (boff > 0)
-		ADD_INSN(ret, node, swap);
-	    ADD_SEND_WITH_FLAG(ret, node, idASET, FIXNUM_INC(argc, 1), INT2FIX(flag));
-	}
-	ADD_INSN(ret, node, pop);
+        CHECK(COMPILE(ret, "NODE_OP_ASGN1 nd_rvalue: ", RNODE_OP_ASGN1(node)->nd_rvalue));
+        ADD_SEND(ret, node, id, INT2FIX(1));
+        if (!popped) {
+            ADD_INSN1(ret, node, setn, INT2FIX(dup_argn+1));
+        }
+        if (flag & VM_CALL_ARGS_SPLAT) {
+            if (flag & VM_CALL_KW_SPLAT) {
+                ADD_INSN1(ret, node, topn, INT2FIX(2));
+                if (!(flag & VM_CALL_ARGS_SPLAT_MUT)) {
+                    ADD_INSN1(ret, node, splatarray, Qtrue);
+                    flag |= VM_CALL_ARGS_SPLAT_MUT;
+                }
+                ADD_INSN(ret, node, swap);
+                ADD_INSN1(ret, node, pushtoarray, INT2FIX(1));
+                ADD_INSN1(ret, node, setn, INT2FIX(2));
+                ADD_INSN(ret, node, pop);
+            }
+            else {
+                if (!(flag & VM_CALL_ARGS_SPLAT_MUT)) {
+                    ADD_INSN(ret, node, swap);
+                    ADD_INSN1(ret, node, splatarray, Qtrue);
+                    ADD_INSN(ret, node, swap);
+                    flag |= VM_CALL_ARGS_SPLAT_MUT;
+                }
+                ADD_INSN1(ret, node, pushtoarray, INT2FIX(1));
+            }
+            ADD_SEND_R(ret, node, idASET, argc, NULL, INT2FIX(flag), NULL);
+        }
+        else {
+            ADD_SEND_R(ret, node, idASET, FIXNUM_INC(argc, 1), NULL, INT2FIX(flag), NULL);
+        }
+        ADD_INSN(ret, node, pop);
     }
     return COMPILE_OK;
 }
@@ -8393,8 +9750,8 @@ static int
 compile_op_asgn2(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE *const node, int popped)
 {
     const int line = nd_line(node);
-    ID atype = node->nd_next->nd_mid;
-    ID vid = node->nd_next->nd_vid, aid = rb_id_attrset(vid);
+    ID atype = RNODE_OP_ASGN2(node)->nd_mid;
+    ID vid = RNODE_OP_ASGN2(node)->nd_vid, aid = rb_id_attrset(vid);
     int asgnflag;
     LABEL *lfin = NEW_LABEL(line);
     LABEL *lcfin = NEW_LABEL(line);
@@ -8424,6 +9781,17 @@ compile_op_asgn2(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE *const node
       lfin:       # o ?
       pop       # o
 
+      # or (popped)
+      if lcfin  # r
+      eval v    # r v
+      send a=   # ?
+      jump lfin # ?
+
+      lcfin:      # r
+
+      lfin:       # ?
+      pop       #
+
       # and
       dup       # r o o
       unless lcfin
@@ -8441,63 +9809,65 @@ compile_op_asgn2(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE *const node
 
     */
 
-    asgnflag = COMPILE_RECV(ret, "NODE_OP_ASGN2#recv", node);
+    asgnflag = COMPILE_RECV(ret, "NODE_OP_ASGN2#recv", node, RNODE_OP_ASGN2(node)->nd_recv);
     CHECK(asgnflag != -1);
-    if (node->nd_next->nd_aid) {
-	lskip = NEW_LABEL(line);
-	ADD_INSN(ret, node, dup);
-	ADD_INSNL(ret, node, branchnil, lskip);
+    if (RNODE_OP_ASGN2(node)->nd_aid) {
+        lskip = NEW_LABEL(line);
+        ADD_INSN(ret, node, dup);
+        ADD_INSNL(ret, node, branchnil, lskip);
     }
     ADD_INSN(ret, node, dup);
     ADD_SEND_WITH_FLAG(ret, node, vid, INT2FIX(0), INT2FIX(asgnflag));
 
     if (atype == idOROP || atype == idANDOP) {
-	ADD_INSN(ret, node, dup);
-	if (atype == idOROP) {
-	    ADD_INSNL(ret, node, branchif, lcfin);
-	}
-	else { /* idANDOP */
-	    ADD_INSNL(ret, node, branchunless, lcfin);
-	}
-	ADD_INSN(ret, node, pop);
-	CHECK(COMPILE(ret, "NODE_OP_ASGN2 val", node->nd_value));
-	ADD_INSN(ret, node, swap);
-	ADD_INSN1(ret, node, topn, INT2FIX(1));
-	ADD_SEND_WITH_FLAG(ret, node, aid, INT2FIX(1), INT2FIX(asgnflag));
-	ADD_INSNL(ret, node, jump, lfin);
-
-	ADD_LABEL(ret, lcfin);
-	ADD_INSN(ret, node, swap);
-
-	ADD_LABEL(ret, lfin);
-	ADD_INSN(ret, node, pop);
-	if (lskip) {
-	    ADD_LABEL(ret, lskip);
-	}
-	if (popped) {
-	    /* we can apply more optimize */
-	    ADD_INSN(ret, node, pop);
-	}
+        if (!popped) {
+            ADD_INSN(ret, node, dup);
+        }
+        if (atype == idOROP) {
+            ADD_INSNL(ret, node, branchif, lcfin);
+        }
+        else { /* idANDOP */
+            ADD_INSNL(ret, node, branchunless, lcfin);
+        }
+        if (!popped) {
+            ADD_INSN(ret, node, pop);
+        }
+        CHECK(COMPILE(ret, "NODE_OP_ASGN2 val", RNODE_OP_ASGN2(node)->nd_value));
+        if (!popped) {
+            ADD_INSN(ret, node, swap);
+            ADD_INSN1(ret, node, topn, INT2FIX(1));
+        }
+        ADD_SEND_WITH_FLAG(ret, node, aid, INT2FIX(1), INT2FIX(asgnflag));
+        ADD_INSNL(ret, node, jump, lfin);
+
+        ADD_LABEL(ret, lcfin);
+        if (!popped) {
+            ADD_INSN(ret, node, swap);
+        }
+
+        ADD_LABEL(ret, lfin);
     }
     else {
-	CHECK(COMPILE(ret, "NODE_OP_ASGN2 val", node->nd_value));
-	ADD_SEND(ret, node, atype, INT2FIX(1));
-	if (!popped) {
-	    ADD_INSN(ret, node, swap);
-	    ADD_INSN1(ret, node, topn, INT2FIX(1));
-	}
-	ADD_SEND_WITH_FLAG(ret, node, aid, INT2FIX(1), INT2FIX(asgnflag));
-	if (lskip && popped) {
-	    ADD_LABEL(ret, lskip);
-	}
-	ADD_INSN(ret, node, pop);
-	if (lskip && !popped) {
-	    ADD_LABEL(ret, lskip);
-	}
+        CHECK(COMPILE(ret, "NODE_OP_ASGN2 val", RNODE_OP_ASGN2(node)->nd_value));
+        ADD_SEND(ret, node, atype, INT2FIX(1));
+        if (!popped) {
+            ADD_INSN(ret, node, swap);
+            ADD_INSN1(ret, node, topn, INT2FIX(1));
+        }
+        ADD_SEND_WITH_FLAG(ret, node, aid, INT2FIX(1), INT2FIX(asgnflag));
+    }
+    if (lskip && popped) {
+        ADD_LABEL(ret, lskip);
+    }
+    ADD_INSN(ret, node, pop);
+    if (lskip && !popped) {
+        ADD_LABEL(ret, lskip);
     }
     return COMPILE_OK;
 }
 
+static int compile_shareable_constant_value(rb_iseq_t *iseq, LINK_ANCHOR *ret, enum rb_parser_shareability shareable, const NODE *lhs, const NODE *value);
+
 static int
 compile_op_cdecl(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE *const node, int popped)
 {
@@ -8506,65 +9876,65 @@ compile_op_cdecl(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE *const node
     LABEL *lassign = 0;
     ID mid;
 
-    switch (nd_type(node->nd_head)) {
+    switch (nd_type(RNODE_OP_CDECL(node)->nd_head)) {
       case NODE_COLON3:
-	ADD_INSN1(ret, node, putobject, rb_cObject);
-	break;
+        ADD_INSN1(ret, node, putobject, rb_cObject);
+        break;
       case NODE_COLON2:
-	CHECK(COMPILE(ret, "NODE_OP_CDECL/colon2#nd_head", node->nd_head->nd_head));
-	break;
+        CHECK(COMPILE(ret, "NODE_OP_CDECL/colon2#nd_head", RNODE_COLON2(RNODE_OP_CDECL(node)->nd_head)->nd_head));
+        break;
       default:
-	COMPILE_ERROR(ERROR_ARGS "%s: invalid node in NODE_OP_CDECL",
-		      ruby_node_name(nd_type(node->nd_head)));
-	return COMPILE_NG;
+        COMPILE_ERROR(ERROR_ARGS "%s: invalid node in NODE_OP_CDECL",
+                      ruby_node_name(nd_type(RNODE_OP_CDECL(node)->nd_head)));
+        return COMPILE_NG;
     }
-    mid = node->nd_head->nd_mid;
+    mid = get_node_colon_nd_mid(RNODE_OP_CDECL(node)->nd_head);
     /* cref */
-    if (node->nd_aid == idOROP) {
-	lassign = NEW_LABEL(line);
-	ADD_INSN(ret, node, dup); /* cref cref */
-	ADD_INSN3(ret, node, defined, INT2FIX(DEFINED_CONST_FROM),
-		  ID2SYM(mid), Qtrue); /* cref bool */
-	ADD_INSNL(ret, node, branchunless, lassign); /* cref */
+    if (RNODE_OP_CDECL(node)->nd_aid == idOROP) {
+        lassign = NEW_LABEL(line);
+        ADD_INSN(ret, node, dup); /* cref cref */
+        ADD_INSN3(ret, node, defined, INT2FIX(DEFINED_CONST_FROM),
+                  ID2SYM(mid), Qtrue); /* cref bool */
+        ADD_INSNL(ret, node, branchunless, lassign); /* cref */
     }
     ADD_INSN(ret, node, dup); /* cref cref */
     ADD_INSN1(ret, node, putobject, Qtrue);
     ADD_INSN1(ret, node, getconstant, ID2SYM(mid)); /* cref obj */
 
-    if (node->nd_aid == idOROP || node->nd_aid == idANDOP) {
-	lfin = NEW_LABEL(line);
-	if (!popped) ADD_INSN(ret, node, dup); /* cref [obj] obj */
-	if (node->nd_aid == idOROP)
-	    ADD_INSNL(ret, node, branchif, lfin);
-	else /* idANDOP */
-	    ADD_INSNL(ret, node, branchunless, lfin);
-	/* cref [obj] */
-	if (!popped) ADD_INSN(ret, node, pop); /* cref */
-	if (lassign) ADD_LABEL(ret, lassign);
-	CHECK(COMPILE(ret, "NODE_OP_CDECL#nd_value", node->nd_value));
-	/* cref value */
-	if (popped)
-	    ADD_INSN1(ret, node, topn, INT2FIX(1)); /* cref value cref */
-	else {
-	    ADD_INSN1(ret, node, dupn, INT2FIX(2)); /* cref value cref value */
-	    ADD_INSN(ret, node, swap); /* cref value value cref */
-	}
-	ADD_INSN1(ret, node, setconstant, ID2SYM(mid)); /* cref [value] */
-	ADD_LABEL(ret, lfin);			    /* cref [value] */
-	if (!popped) ADD_INSN(ret, node, swap); /* [value] cref */
-	ADD_INSN(ret, node, pop); /* [value] */
+    if (RNODE_OP_CDECL(node)->nd_aid == idOROP || RNODE_OP_CDECL(node)->nd_aid == idANDOP) {
+        lfin = NEW_LABEL(line);
+        if (!popped) ADD_INSN(ret, node, dup); /* cref [obj] obj */
+        if (RNODE_OP_CDECL(node)->nd_aid == idOROP)
+            ADD_INSNL(ret, node, branchif, lfin);
+        else /* idANDOP */
+            ADD_INSNL(ret, node, branchunless, lfin);
+        /* cref [obj] */
+        if (!popped) ADD_INSN(ret, node, pop); /* cref */
+        if (lassign) ADD_LABEL(ret, lassign);
+        CHECK(compile_shareable_constant_value(iseq, ret, RNODE_OP_CDECL(node)->shareability, RNODE_OP_CDECL(node)->nd_head, RNODE_OP_CDECL(node)->nd_value));
+        /* cref value */
+        if (popped)
+            ADD_INSN1(ret, node, topn, INT2FIX(1)); /* cref value cref */
+        else {
+            ADD_INSN1(ret, node, dupn, INT2FIX(2)); /* cref value cref value */
+            ADD_INSN(ret, node, swap); /* cref value value cref */
+        }
+        ADD_INSN1(ret, node, setconstant, ID2SYM(mid)); /* cref [value] */
+        ADD_LABEL(ret, lfin);			    /* cref [value] */
+        if (!popped) ADD_INSN(ret, node, swap); /* [value] cref */
+        ADD_INSN(ret, node, pop); /* [value] */
     }
     else {
-	CHECK(COMPILE(ret, "NODE_OP_CDECL#nd_value", node->nd_value));
-	/* cref obj value */
-	ADD_CALL(ret, node, node->nd_aid, INT2FIX(1));
-	/* cref value */
-	ADD_INSN(ret, node, swap); /* value cref */
-	if (!popped) {
-	    ADD_INSN1(ret, node, topn, INT2FIX(1)); /* value cref value */
-	    ADD_INSN(ret, node, swap); /* value value cref */
-	}
-	ADD_INSN1(ret, node, setconstant, ID2SYM(mid));
+        CHECK(compile_shareable_constant_value(iseq, ret, RNODE_OP_CDECL(node)->shareability, RNODE_OP_CDECL(node)->nd_head, RNODE_OP_CDECL(node)->nd_value));
+        /* cref obj value */
+        ADD_CALL(ret, node, RNODE_OP_CDECL(node)->nd_aid, INT2FIX(1));
+        /* cref value */
+        ADD_INSN(ret, node, swap); /* value cref */
+        if (!popped) {
+            ADD_INSN1(ret, node, topn, INT2FIX(1)); /* value cref value */
+            ADD_INSN(ret, node, swap); /* value value cref */
+        }
+        ADD_INSN1(ret, node, setconstant, ID2SYM(mid));
     }
     return COMPILE_OK;
 }
@@ -8576,40 +9946,41 @@ compile_op_log(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE *const node,
     LABEL *lfin = NEW_LABEL(line);
     LABEL *lassign;
 
-    if (type == NODE_OP_ASGN_OR && !nd_type_p(node->nd_head, NODE_IVAR)) {
-	LABEL *lfinish[2];
-	lfinish[0] = lfin;
-	lfinish[1] = 0;
-	defined_expr(iseq, ret, node->nd_head, lfinish, Qfalse);
-	lassign = lfinish[1];
-	if (!lassign) {
-	    lassign = NEW_LABEL(line);
-	}
-	ADD_INSNL(ret, node, branchunless, lassign);
+    if (type == NODE_OP_ASGN_OR && !nd_type_p(RNODE_OP_ASGN_OR(node)->nd_head, NODE_IVAR)) {
+        LABEL *lfinish[2];
+        lfinish[0] = lfin;
+        lfinish[1] = 0;
+        defined_expr(iseq, ret, RNODE_OP_ASGN_OR(node)->nd_head, lfinish, Qfalse, false);
+        lassign = lfinish[1];
+        if (!lassign) {
+            lassign = NEW_LABEL(line);
+        }
+        ADD_INSNL(ret, node, branchunless, lassign);
     }
     else {
-	lassign = NEW_LABEL(line);
+        lassign = NEW_LABEL(line);
     }
 
-    CHECK(COMPILE(ret, "NODE_OP_ASGN_AND/OR#nd_head", node->nd_head));
-    ADD_INSN(ret, node, dup);
+    CHECK(COMPILE(ret, "NODE_OP_ASGN_AND/OR#nd_head", RNODE_OP_ASGN_OR(node)->nd_head));
+
+    if (!popped) {
+        ADD_INSN(ret, node, dup);
+    }
 
     if (type == NODE_OP_ASGN_AND) {
-	ADD_INSNL(ret, node, branchunless, lfin);
+        ADD_INSNL(ret, node, branchunless, lfin);
     }
     else {
-	ADD_INSNL(ret, node, branchif, lfin);
+        ADD_INSNL(ret, node, branchif, lfin);
+    }
+
+    if (!popped) {
+        ADD_INSN(ret, node, pop);
     }
 
-    ADD_INSN(ret, node, pop);
     ADD_LABEL(ret, lassign);
-    CHECK(COMPILE(ret, "NODE_OP_ASGN_AND/OR#nd_value", node->nd_value));
+    CHECK(COMPILE_(ret, "NODE_OP_ASGN_AND/OR#nd_value", RNODE_OP_ASGN_OR(node)->nd_value, popped));
     ADD_LABEL(ret, lfin);
-
-    if (popped) {
-	/* we can apply more optimize */
-	ADD_INSN(ret, node, pop);
-    }
     return COMPILE_OK;
 }
 
@@ -8622,131 +9993,142 @@ compile_super(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE *const node, i
     unsigned int flag = 0;
     struct rb_callinfo_kwarg *keywords = NULL;
     const rb_iseq_t *parent_block = ISEQ_COMPILE_DATA(iseq)->current_block;
+    int use_block = 1;
 
     INIT_ANCHOR(args);
     ISEQ_COMPILE_DATA(iseq)->current_block = NULL;
+
     if (type == NODE_SUPER) {
-	VALUE vargc = setup_args(iseq, args, node->nd_args, &flag, &keywords);
-	CHECK(!NIL_P(vargc));
-	argc = FIX2INT(vargc);
+        VALUE vargc = setup_args(iseq, args, RNODE_SUPER(node)->nd_args, &flag, &keywords);
+        CHECK(!NIL_P(vargc));
+        argc = FIX2INT(vargc);
+        if ((flag & VM_CALL_ARGS_BLOCKARG) && (flag & VM_CALL_KW_SPLAT) && !(flag & VM_CALL_KW_SPLAT_MUT)) {
+            ADD_INSN(args, node, splatkw);
+        }
+
+        if (flag & VM_CALL_ARGS_BLOCKARG) {
+            use_block = 0;
+        }
     }
     else {
-	/* NODE_ZSUPER */
-	int i;
-	const rb_iseq_t *liseq = body->local_iseq;
+        /* NODE_ZSUPER */
+        int i;
+        const rb_iseq_t *liseq = body->local_iseq;
         const struct rb_iseq_constant_body *const local_body = ISEQ_BODY(liseq);
-	const struct rb_iseq_param_keyword *const local_kwd = local_body->param.keyword;
-	int lvar_level = get_lvar_level(iseq);
-
-	argc = local_body->param.lead_num;
-
-	/* normal arguments */
-	for (i = 0; i < local_body->param.lead_num; i++) {
-	    int idx = local_body->local_table_size - i;
-	    ADD_GETLOCAL(args, node, idx, lvar_level);
-	}
-
-	if (local_body->param.flags.has_opt) {
-	    /* optional arguments */
-	    int j;
-	    for (j = 0; j < local_body->param.opt_num; j++) {
-		int idx = local_body->local_table_size - (i + j);
-		ADD_GETLOCAL(args, node, idx, lvar_level);
-	    }
-	    i += j;
-	    argc = i;
-	}
-	if (local_body->param.flags.has_rest) {
-	    /* rest argument */
-	    int idx = local_body->local_table_size - local_body->param.rest_start;
-	    ADD_GETLOCAL(args, node, idx, lvar_level);
-	    ADD_INSN1(args, node, splatarray, Qfalse);
-
-	    argc = local_body->param.rest_start + 1;
-	    flag |= VM_CALL_ARGS_SPLAT;
-	}
-	if (local_body->param.flags.has_post) {
-	    /* post arguments */
-	    int post_len = local_body->param.post_num;
-	    int post_start = local_body->param.post_start;
-
-	    if (local_body->param.flags.has_rest) {
-		int j;
-		for (j=0; j<post_len; j++) {
-		    int idx = local_body->local_table_size - (post_start + j);
-		    ADD_GETLOCAL(args, node, idx, lvar_level);
-		}
-		ADD_INSN1(args, node, newarray, INT2FIX(j));
-		ADD_INSN (args, node, concatarray);
-		/* argc is settled at above */
-	    }
-	    else {
-		int j;
-		for (j=0; j<post_len; j++) {
-		    int idx = local_body->local_table_size - (post_start + j);
-		    ADD_GETLOCAL(args, node, idx, lvar_level);
-		}
-		argc = post_len + post_start;
-	    }
-	}
-
-	if (local_body->param.flags.has_kw) { /* TODO: support keywords */
-	    int local_size = local_body->local_table_size;
-	    argc++;
-
-	    ADD_INSN1(args, node, putspecialobject, INT2FIX(VM_SPECIAL_OBJECT_VMCORE));
-
-	    if (local_body->param.flags.has_kwrest) {
-		int idx = local_body->local_table_size - local_kwd->rest_start;
-		ADD_GETLOCAL(args, node, idx, lvar_level);
-                if (local_kwd->num > 0) {
-                    ADD_SEND (args, node, rb_intern("dup"), INT2FIX(0));
-                    flag |= VM_CALL_KW_SPLAT_MUT;
+        const struct rb_iseq_param_keyword *const local_kwd = local_body->param.keyword;
+        int lvar_level = get_lvar_level(iseq);
+
+        argc = local_body->param.lead_num;
+
+        /* normal arguments */
+        for (i = 0; i < local_body->param.lead_num; i++) {
+            int idx = local_body->local_table_size - i;
+            ADD_GETLOCAL(args, node, idx, lvar_level);
+        }
+
+        /* forward ... */
+        if (local_body->param.flags.forwardable) {
+            flag |= VM_CALL_FORWARDING;
+            int idx = local_body->local_table_size - get_local_var_idx(liseq, idDot3);
+            ADD_GETLOCAL(args, node, idx, lvar_level);
+        }
+
+        if (local_body->param.flags.has_opt) {
+            /* optional arguments */
+            int j;
+            for (j = 0; j < local_body->param.opt_num; j++) {
+                int idx = local_body->local_table_size - (i + j);
+                ADD_GETLOCAL(args, node, idx, lvar_level);
+            }
+            i += j;
+            argc = i;
+        }
+        if (local_body->param.flags.has_rest) {
+            /* rest argument */
+            int idx = local_body->local_table_size - local_body->param.rest_start;
+            ADD_GETLOCAL(args, node, idx, lvar_level);
+            ADD_INSN1(args, node, splatarray, RBOOL(local_body->param.flags.has_post));
+
+            argc = local_body->param.rest_start + 1;
+            flag |= VM_CALL_ARGS_SPLAT;
+        }
+        if (local_body->param.flags.has_post) {
+            /* post arguments */
+            int post_len = local_body->param.post_num;
+            int post_start = local_body->param.post_start;
+
+            if (local_body->param.flags.has_rest) {
+                int j;
+                for (j=0; j<post_len; j++) {
+                    int idx = local_body->local_table_size - (post_start + j);
+                    ADD_GETLOCAL(args, node, idx, lvar_level);
                 }
-	    }
-	    else {
-		ADD_INSN1(args, node, newhash, INT2FIX(0));
-                flag |= VM_CALL_KW_SPLAT_MUT;
-	    }
-	    for (i = 0; i < local_kwd->num; ++i) {
-		ID id = local_kwd->table[i];
-		int idx = local_size - get_local_var_idx(liseq, id);
-		ADD_INSN1(args, node, putobject, ID2SYM(id));
-		ADD_GETLOCAL(args, node, idx, lvar_level);
-	    }
-	    ADD_SEND(args, node, id_core_hash_merge_ptr, INT2FIX(i * 2 + 1));
-	    if (local_body->param.flags.has_rest) {
-		ADD_INSN1(args, node, newarray, INT2FIX(1));
-		ADD_INSN (args, node, concatarray);
-		--argc;
-	    }
-            flag |= VM_CALL_KW_SPLAT;
-	}
-	else if (local_body->param.flags.has_kwrest) {
-	    int idx = local_body->local_table_size - local_kwd->rest_start;
-	    ADD_GETLOCAL(args, node, idx, lvar_level);
-
-	    if (local_body->param.flags.has_rest) {
-		ADD_INSN1(args, node, newarray, INT2FIX(1));
-		ADD_INSN (args, node, concatarray);
-	    }
-	    else {
-		argc++;
-	    }
+                ADD_INSN1(args, node, pushtoarray, INT2FIX(j));
+                flag |= VM_CALL_ARGS_SPLAT_MUT;
+                /* argc is settled at above */
+            }
+            else {
+                int j;
+                for (j=0; j<post_len; j++) {
+                    int idx = local_body->local_table_size - (post_start + j);
+                    ADD_GETLOCAL(args, node, idx, lvar_level);
+                }
+                argc = post_len + post_start;
+            }
+        }
+
+        if (local_body->param.flags.has_kw) { /* TODO: support keywords */
+            int local_size = local_body->local_table_size;
+            argc++;
+
+            ADD_INSN1(args, node, putspecialobject, INT2FIX(VM_SPECIAL_OBJECT_VMCORE));
+
+            if (local_body->param.flags.has_kwrest) {
+                int idx = local_body->local_table_size - local_kwd->rest_start;
+                ADD_GETLOCAL(args, node, idx, lvar_level);
+                RUBY_ASSERT(local_kwd->num > 0);
+                ADD_SEND (args, node, rb_intern("dup"), INT2FIX(0));
+            }
+            else {
+                ADD_INSN1(args, node, newhash, INT2FIX(0));
+            }
+            for (i = 0; i < local_kwd->num; ++i) {
+                ID id = local_kwd->table[i];
+                int idx = local_size - get_local_var_idx(liseq, id);
+                ADD_INSN1(args, node, putobject, ID2SYM(id));
+                ADD_GETLOCAL(args, node, idx, lvar_level);
+            }
+            ADD_SEND(args, node, id_core_hash_merge_ptr, INT2FIX(i * 2 + 1));
+            flag |= VM_CALL_KW_SPLAT| VM_CALL_KW_SPLAT_MUT;
+        }
+        else if (local_body->param.flags.has_kwrest) {
+            int idx = local_body->local_table_size - local_kwd->rest_start;
+            ADD_GETLOCAL(args, node, idx, lvar_level);
+            argc++;
             flag |= VM_CALL_KW_SPLAT;
-	}
+        }
+    }
+
+    if (use_block && parent_block == NULL) {
+        iseq_set_use_block(ISEQ_BODY(iseq)->local_iseq);
     }
 
     flag |= VM_CALL_SUPER | VM_CALL_FCALL;
     if (type == NODE_ZSUPER) flag |= VM_CALL_ZSUPER;
     ADD_INSN(ret, node, putself);
     ADD_SEQ(ret, args);
-    ADD_INSN2(ret, node, invokesuper,
-	      new_callinfo(iseq, 0, argc, flag, keywords, parent_block != NULL),
-	      parent_block);
+
+    const struct rb_callinfo * ci = new_callinfo(iseq, 0, argc, flag, keywords, parent_block != NULL);
+
+    if (vm_ci_flag(ci) & VM_CALL_FORWARDING) {
+        ADD_INSN2(ret, node, invokesuperforward, ci, parent_block);
+    }
+    else {
+        ADD_INSN2(ret, node, invokesuper, ci, parent_block);
+    }
 
     if (popped) {
-	ADD_INSN(ret, node, pop);
+        ADD_INSN(ret, node, pop);
     }
     return COMPILE_OK;
 }
@@ -8765,24 +10147,25 @@ compile_yield(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE *const node, i
       case ISEQ_TYPE_TOP:
       case ISEQ_TYPE_MAIN:
       case ISEQ_TYPE_CLASS:
-	COMPILE_ERROR(ERROR_ARGS "Invalid yield");
-	return COMPILE_NG;
+        COMPILE_ERROR(ERROR_ARGS "Invalid yield");
+        return COMPILE_NG;
       default: /* valid */;
     }
 
-    if (node->nd_head) {
-	argc = setup_args(iseq, args, node->nd_head, &flag, &keywords);
-	CHECK(!NIL_P(argc));
+    if (RNODE_YIELD(node)->nd_head) {
+        argc = setup_args(iseq, args, RNODE_YIELD(node)->nd_head, &flag, &keywords);
+        CHECK(!NIL_P(argc));
     }
     else {
-	argc = INT2FIX(0);
+        argc = INT2FIX(0);
     }
 
     ADD_SEQ(ret, args);
     ADD_INSN1(ret, node, invokeblock, new_callinfo(iseq, 0, FIX2INT(argc), flag, keywords, FALSE));
+    iseq_set_use_block(ISEQ_BODY(iseq)->local_iseq);
 
     if (popped) {
-	ADD_INSN(ret, node, pop);
+        ADD_INSN(ret, node, pop);
     }
 
     int level = 0;
@@ -8805,30 +10188,34 @@ compile_match(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE *const node, i
     INIT_ANCHOR(val);
     switch ((int)type) {
       case NODE_MATCH:
-	ADD_INSN1(recv, node, putobject, node->nd_lit);
-	ADD_INSN2(val, node, getspecial, INT2FIX(0),
-		  INT2FIX(0));
-	break;
+        {
+            VALUE re = rb_node_regx_string_val(node);
+            RB_OBJ_SET_FROZEN_SHAREABLE(re);
+            ADD_INSN1(recv, node, putobject, re);
+            ADD_INSN2(val, node, getspecial, INT2FIX(0),
+                      INT2FIX(0));
+        }
+        break;
       case NODE_MATCH2:
-	CHECK(COMPILE(recv, "receiver", node->nd_recv));
-	CHECK(COMPILE(val, "value", node->nd_value));
-	break;
+        CHECK(COMPILE(recv, "receiver", RNODE_MATCH2(node)->nd_recv));
+        CHECK(COMPILE(val, "value", RNODE_MATCH2(node)->nd_value));
+        break;
       case NODE_MATCH3:
-	CHECK(COMPILE(recv, "receiver", node->nd_value));
-	CHECK(COMPILE(val, "value", node->nd_recv));
-	break;
+        CHECK(COMPILE(recv, "receiver", RNODE_MATCH3(node)->nd_value));
+        CHECK(COMPILE(val, "value", RNODE_MATCH3(node)->nd_recv));
+        break;
     }
 
     ADD_SEQ(ret, recv);
     ADD_SEQ(ret, val);
     ADD_SEND(ret, node, idEqTilde, INT2FIX(1));
 
-    if (node->nd_args) {
-	compile_named_capture_assign(iseq, ret, node->nd_args);
+    if (nd_type_p(node, NODE_MATCH2) && RNODE_MATCH2(node)->nd_args) {
+        compile_named_capture_assign(iseq, ret, RNODE_MATCH2(node)->nd_args);
     }
 
     if (popped) {
-	ADD_INSN(ret, node, pop);
+        ADD_INSN(ret, node, pop);
     }
     return COMPILE_OK;
 }
@@ -8836,46 +10223,41 @@ compile_match(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE *const node, i
 static int
 compile_colon2(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE *const node, int popped)
 {
-    const int line = nd_line(node);
-    if (rb_is_const_id(node->nd_mid)) {
-	/* constant */
-	LABEL *lend = NEW_LABEL(line);
-        int ic_index = ISEQ_BODY(iseq)->is_size++;
-
-	DECL_ANCHOR(pref);
-	DECL_ANCHOR(body);
-
-	INIT_ANCHOR(pref);
-	INIT_ANCHOR(body);
-	CHECK(compile_const_prefix(iseq, node, pref, body));
-	if (LIST_INSN_SIZE_ZERO(pref)) {
-	    if (ISEQ_COMPILE_DATA(iseq)->option->inline_const_cache) {
-		ADD_INSN2(ret, node, opt_getinlinecache, lend, INT2FIX(ic_index));
-	    }
-	    else {
-		ADD_INSN(ret, node, putnil);
-	    }
-
-	    ADD_SEQ(ret, body);
-
-	    if (ISEQ_COMPILE_DATA(iseq)->option->inline_const_cache) {
-		ADD_INSN1(ret, node, opt_setinlinecache, INT2FIX(ic_index));
-		ADD_LABEL(ret, lend);
-	    }
-	}
-	else {
-	    ADD_SEQ(ret, pref);
-	    ADD_SEQ(ret, body);
-	}
+    if (rb_is_const_id(RNODE_COLON2(node)->nd_mid)) {
+        /* constant */
+        VALUE segments;
+        if (ISEQ_COMPILE_DATA(iseq)->option->inline_const_cache &&
+                (segments = collect_const_segments(iseq, node))) {
+            ISEQ_BODY(iseq)->ic_size++;
+            ADD_INSN1(ret, node, opt_getconstant_path, segments);
+            RB_OBJ_WRITTEN(iseq, Qundef, segments);
+        }
+        else {
+            /* constant */
+            DECL_ANCHOR(pref);
+            DECL_ANCHOR(body);
+
+            INIT_ANCHOR(pref);
+            INIT_ANCHOR(body);
+            CHECK(compile_const_prefix(iseq, node, pref, body));
+            if (LIST_INSN_SIZE_ZERO(pref)) {
+                ADD_INSN(ret, node, putnil);
+                ADD_SEQ(ret, body);
+            }
+            else {
+                ADD_SEQ(ret, pref);
+                ADD_SEQ(ret, body);
+            }
+        }
     }
     else {
-	/* function call */
-	ADD_CALL_RECEIVER(ret, node);
-	CHECK(COMPILE(ret, "colon2#nd_head", node->nd_head));
-	ADD_CALL(ret, node, node->nd_mid, INT2FIX(1));
+        /* function call */
+        ADD_CALL_RECEIVER(ret, node);
+        CHECK(COMPILE(ret, "colon2#nd_head", RNODE_COLON2(node)->nd_head));
+        ADD_CALL(ret, node, RNODE_COLON2(node)->nd_mid, INT2FIX(1));
     }
     if (popped) {
-	ADD_INSN(ret, node, pop);
+        ADD_INSN(ret, node, pop);
     }
     return COMPILE_OK;
 }
@@ -8883,29 +10265,24 @@ compile_colon2(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE *const node,
 static int
 compile_colon3(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE *const node, int popped)
 {
-    const int line = nd_line(node);
-    LABEL *lend = NEW_LABEL(line);
-    int ic_index = ISEQ_BODY(iseq)->is_size++;
-
-    debugi("colon3#nd_mid", node->nd_mid);
+    debugi("colon3#nd_mid", RNODE_COLON3(node)->nd_mid);
 
     /* add cache insn */
     if (ISEQ_COMPILE_DATA(iseq)->option->inline_const_cache) {
-	ADD_INSN2(ret, node, opt_getinlinecache, lend, INT2FIX(ic_index));
-	ADD_INSN(ret, node, pop);
+        ISEQ_BODY(iseq)->ic_size++;
+        VALUE segments = rb_ary_new_from_args(2, ID2SYM(idNULL), ID2SYM(RNODE_COLON3(node)->nd_mid));
+        RB_OBJ_SET_FROZEN_SHAREABLE(segments);
+        ADD_INSN1(ret, node, opt_getconstant_path, segments);
+        RB_OBJ_WRITTEN(iseq, Qundef, segments);
     }
-
-    ADD_INSN1(ret, node, putobject, rb_cObject);
-    ADD_INSN1(ret, node, putobject, Qtrue);
-    ADD_INSN1(ret, node, getconstant, ID2SYM(node->nd_mid));
-
-    if (ISEQ_COMPILE_DATA(iseq)->option->inline_const_cache) {
-	ADD_INSN1(ret, node, opt_setinlinecache, INT2FIX(ic_index));
-	ADD_LABEL(ret, lend);
+    else {
+        ADD_INSN1(ret, node, putobject, rb_cObject);
+        ADD_INSN1(ret, node, putobject, Qtrue);
+        ADD_INSN1(ret, node, getconstant, ID2SYM(RNODE_COLON3(node)->nd_mid));
     }
 
     if (popped) {
-	ADD_INSN(ret, node, pop);
+        ADD_INSN(ret, node, pop);
     }
     return COMPILE_OK;
 }
@@ -8914,24 +10291,25 @@ static int
 compile_dots(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE *const node, int popped, const int excl)
 {
     VALUE flag = INT2FIX(excl);
-    const NODE *b = node->nd_beg;
-    const NODE *e = node->nd_end;
+    const NODE *b = RNODE_DOT2(node)->nd_beg;
+    const NODE *e = RNODE_DOT2(node)->nd_end;
 
     if (optimizable_range_item_p(b) && optimizable_range_item_p(e)) {
-	if (!popped) {
-            VALUE bv = nd_type_p(b, NODE_LIT) ? b->nd_lit : Qnil;
-            VALUE ev = nd_type_p(e, NODE_LIT) ? e->nd_lit : Qnil;
-	    VALUE val = rb_range_new(bv, ev, excl);
-	    ADD_INSN1(ret, node, putobject, val);
-	    RB_OBJ_WRITTEN(iseq, Qundef, val);
-	}
+        if (!popped) {
+            VALUE bv = optimized_range_item(b);
+            VALUE ev = optimized_range_item(e);
+            VALUE val = rb_range_new(bv, ev, excl);
+            rb_ractor_make_shareable(rb_obj_freeze(val));
+            ADD_INSN1(ret, node, putobject, val);
+            RB_OBJ_WRITTEN(iseq, Qundef, val);
+        }
     }
     else {
-	CHECK(COMPILE_(ret, "min", b, popped));
-	CHECK(COMPILE_(ret, "max", e, popped));
-	if (!popped) {
-	    ADD_INSN1(ret, node, newrange, flag);
-	}
+        CHECK(COMPILE_(ret, "min", b, popped));
+        CHECK(COMPILE_(ret, "max", e, popped));
+        if (!popped) {
+            ADD_INSN1(ret, node, newrange, flag);
+        }
     }
     return COMPILE_OK;
 }
@@ -8941,25 +10319,25 @@ compile_errinfo(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE *const node,
 {
     if (!popped) {
         if (ISEQ_BODY(iseq)->type == ISEQ_TYPE_RESCUE) {
-	    ADD_GETLOCAL(ret, node, LVAR_ERRINFO, 0);
-	}
-	else {
-	    const rb_iseq_t *ip = iseq;
-	    int level = 0;
-	    while (ip) {
+            ADD_GETLOCAL(ret, node, LVAR_ERRINFO, 0);
+        }
+        else {
+            const rb_iseq_t *ip = iseq;
+            int level = 0;
+            while (ip) {
                 if (ISEQ_BODY(ip)->type == ISEQ_TYPE_RESCUE) {
-		    break;
-		}
+                    break;
+                }
                 ip = ISEQ_BODY(ip)->parent_iseq;
-		level++;
-	    }
-	    if (ip) {
-		ADD_GETLOCAL(ret, node, LVAR_ERRINFO, level);
-	    }
-	    else {
-		ADD_INSN(ret, node, putnil);
-	    }
-	}
+                level++;
+            }
+            if (ip) {
+                ADD_GETLOCAL(ret, node, LVAR_ERRINFO, level);
+            }
+            else {
+                ADD_INSN(ret, node, putnil);
+            }
+        }
     }
     return COMPILE_OK;
 }
@@ -8969,32 +10347,38 @@ compile_kw_arg(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE *const node,
 {
     struct rb_iseq_constant_body *const body = ISEQ_BODY(iseq);
     LABEL *end_label = NEW_LABEL(nd_line(node));
-    const NODE *default_value = node->nd_body->nd_value;
+    const NODE *default_value = get_nd_value(RNODE_KW_ARG(node)->nd_body);
 
     if (default_value == NODE_SPECIAL_REQUIRED_KEYWORD) {
-	/* required argument. do nothing */
-	COMPILE_ERROR(ERROR_ARGS "unreachable");
-	return COMPILE_NG;
+        /* required argument. do nothing */
+        COMPILE_ERROR(ERROR_ARGS "unreachable");
+        return COMPILE_NG;
     }
-    else if (nd_type_p(default_value, NODE_LIT) ||
-	     nd_type_p(default_value, NODE_NIL) ||
-	     nd_type_p(default_value, NODE_TRUE) ||
-	     nd_type_p(default_value, NODE_FALSE)) {
-	COMPILE_ERROR(ERROR_ARGS "unreachable");
-	return COMPILE_NG;
+    else if (nd_type_p(default_value, NODE_SYM) ||
+             nd_type_p(default_value, NODE_REGX) ||
+             nd_type_p(default_value, NODE_LINE) ||
+             nd_type_p(default_value, NODE_INTEGER) ||
+             nd_type_p(default_value, NODE_FLOAT) ||
+             nd_type_p(default_value, NODE_RATIONAL) ||
+             nd_type_p(default_value, NODE_IMAGINARY) ||
+             nd_type_p(default_value, NODE_NIL) ||
+             nd_type_p(default_value, NODE_TRUE) ||
+             nd_type_p(default_value, NODE_FALSE)) {
+        COMPILE_ERROR(ERROR_ARGS "unreachable");
+        return COMPILE_NG;
     }
     else {
-	/* if keywordcheck(_kw_bits, nth_keyword)
-	 *   kw = default_value
-	 * end
-	 */
-	int kw_bits_idx = body->local_table_size - body->param.keyword->bits_start;
-	int keyword_idx = body->param.keyword->num;
-
-	ADD_INSN2(ret, node, checkkeyword, INT2FIX(kw_bits_idx + VM_ENV_DATA_SIZE - 1), INT2FIX(keyword_idx));
-	ADD_INSNL(ret, node, branchif, end_label);
-	CHECK(COMPILE_POPPED(ret, "keyword default argument", node->nd_body));
-	ADD_LABEL(ret, end_label);
+        /* if keywordcheck(_kw_bits, nth_keyword)
+         *   kw = default_value
+         * end
+         */
+        int kw_bits_idx = body->local_table_size - body->param.keyword->bits_start;
+        int keyword_idx = body->param.keyword->num;
+
+        ADD_INSN2(ret, node, checkkeyword, INT2FIX(kw_bits_idx + VM_ENV_DATA_SIZE - 1), INT2FIX(keyword_idx));
+        ADD_INSNL(ret, node, branchif, end_label);
+        CHECK(COMPILE_POPPED(ret, "keyword default argument", RNODE_KW_ARG(node)->nd_body));
+        ADD_LABEL(ret, end_label);
     }
     return COMPILE_OK;
 }
@@ -9005,41 +10389,17 @@ compile_attrasgn(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE *const node
     DECL_ANCHOR(recv);
     DECL_ANCHOR(args);
     unsigned int flag = 0;
-    ID mid = node->nd_mid;
+    ID mid = RNODE_ATTRASGN(node)->nd_mid;
     VALUE argc;
     LABEL *else_label = NULL;
     VALUE branches = Qfalse;
 
-    /* optimization shortcut
-     *   obj["literal"] = value -> opt_aset_with(obj, "literal", value)
-     */
-    if (mid == idASET && !private_recv_p(node) && node->nd_args &&
-	nd_type_p(node->nd_args, NODE_LIST) && node->nd_args->nd_alen == 2 &&
-	nd_type_p(node->nd_args->nd_head, NODE_STR) &&
-	ISEQ_COMPILE_DATA(iseq)->current_block == NULL &&
-	!ISEQ_COMPILE_DATA(iseq)->option->frozen_string_literal &&
-	ISEQ_COMPILE_DATA(iseq)->option->specialized_instruction)
-    {
-	VALUE str = rb_fstring(node->nd_args->nd_head->nd_lit);
-	CHECK(COMPILE(ret, "recv", node->nd_recv));
-	CHECK(COMPILE(ret, "value", node->nd_args->nd_next->nd_head));
-	if (!popped) {
-	    ADD_INSN(ret, node, swap);
-	    ADD_INSN1(ret, node, topn, INT2FIX(1));
-	}
-	ADD_INSN2(ret, node, opt_aset_with, str,
-		  new_callinfo(iseq, idASET, 2, 0, NULL, FALSE));
-	RB_OBJ_WRITTEN(iseq, Qundef, str);
-	ADD_INSN(ret, node, pop);
-	return COMPILE_OK;
-    }
-
     INIT_ANCHOR(recv);
     INIT_ANCHOR(args);
-    argc = setup_args(iseq, args, node->nd_args, &flag, NULL);
+    argc = setup_args(iseq, args, RNODE_ATTRASGN(node)->nd_args, &flag, NULL);
     CHECK(!NIL_P(argc));
 
-    int asgnflag = COMPILE_RECV(recv, "recv", node);
+    int asgnflag = COMPILE_RECV(recv, "recv", node, RNODE_ATTRASGN(node)->nd_recv);
     CHECK(asgnflag != -1);
     flag |= (unsigned int)asgnflag;
 
@@ -9047,38 +10407,29 @@ compile_attrasgn(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE *const node
     debugp_param("nd_mid", ID2SYM(mid));
 
     if (!rb_is_attrset_id(mid)) {
-	/* safe nav attr */
-	mid = rb_id_attrset(mid);
-	else_label = qcall_branch_start(iseq, recv, &branches, node, node);
+        /* safe nav attr */
+        mid = rb_id_attrset(mid);
+        else_label = qcall_branch_start(iseq, recv, &branches, node, node);
     }
     if (!popped) {
-	ADD_INSN(ret, node, putnil);
-	ADD_SEQ(ret, recv);
-	ADD_SEQ(ret, args);
-
-	if (flag & VM_CALL_ARGS_BLOCKARG) {
-	    ADD_INSN1(ret, node, topn, INT2FIX(1));
-	    if (flag & VM_CALL_ARGS_SPLAT) {
-		ADD_INSN1(ret, node, putobject, INT2FIX(-1));
-		ADD_SEND_WITH_FLAG(ret, node, idAREF, INT2FIX(1), INT2FIX(asgnflag));
-	    }
-	    ADD_INSN1(ret, node, setn, FIXNUM_INC(argc, 3));
-	    ADD_INSN (ret, node, pop);
-	}
-	else if (flag & VM_CALL_ARGS_SPLAT) {
-	    ADD_INSN(ret, node, dup);
-	    ADD_INSN1(ret, node, putobject, INT2FIX(-1));
-	    ADD_SEND_WITH_FLAG(ret, node, idAREF, INT2FIX(1), INT2FIX(asgnflag));
-	    ADD_INSN1(ret, node, setn, FIXNUM_INC(argc, 2));
-	    ADD_INSN (ret, node, pop);
-	}
-	else {
-	    ADD_INSN1(ret, node, setn, FIXNUM_INC(argc, 1));
-	}
+        ADD_INSN(ret, node, putnil);
+        ADD_SEQ(ret, recv);
+        ADD_SEQ(ret, args);
+
+        if (flag & VM_CALL_ARGS_SPLAT) {
+            ADD_INSN(ret, node, dup);
+            ADD_INSN1(ret, node, putobject, INT2FIX(-1));
+            ADD_SEND_WITH_FLAG(ret, node, idAREF, INT2FIX(1), INT2FIX(asgnflag));
+            ADD_INSN1(ret, node, setn, FIXNUM_INC(argc, 2));
+            ADD_INSN (ret, node, pop);
+        }
+        else {
+            ADD_INSN1(ret, node, setn, FIXNUM_INC(argc, 1));
+        }
     }
     else {
-	ADD_SEQ(ret, recv);
-	ADD_SEQ(ret, args);
+        ADD_SEQ(ret, recv);
+        ADD_SEQ(ret, args);
     }
     ADD_SEND_WITH_FLAG(ret, node, mid, argc, INT2FIX(flag));
     qcall_branch_end(iseq, ret, else_label, branches, node, node);
@@ -9086,6 +10437,371 @@ compile_attrasgn(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE *const node
     return COMPILE_OK;
 }
 
+static int
+compile_make_shareable_node(rb_iseq_t *iseq, LINK_ANCHOR *ret, LINK_ANCHOR *sub, const NODE *value, bool copy)
+{
+    ADD_INSN1(ret, value, putspecialobject, INT2FIX(VM_SPECIAL_OBJECT_VMCORE));
+    ADD_SEQ(ret, sub);
+
+    if (copy) {
+        /*
+         * NEW_CALL(fcore, rb_intern("make_shareable_copy"),
+         *          NEW_LIST(value, loc), loc);
+         */
+        ADD_SEND_WITH_FLAG(ret, value, rb_intern("make_shareable_copy"), INT2FIX(1), INT2FIX(VM_CALL_ARGS_SIMPLE));
+    }
+    else {
+        /*
+         * NEW_CALL(fcore, rb_intern("make_shareable"),
+         *          NEW_LIST(value, loc), loc);
+         */
+        ADD_SEND_WITH_FLAG(ret, value, rb_intern("make_shareable"), INT2FIX(1), INT2FIX(VM_CALL_ARGS_SIMPLE));
+    }
+
+    return COMPILE_OK;
+}
+
+static VALUE
+node_const_decl_val(const NODE *node)
+{
+    VALUE path;
+    switch (nd_type(node)) {
+      case NODE_CDECL:
+        if (RNODE_CDECL(node)->nd_vid) {
+            path = rb_id2str(RNODE_CDECL(node)->nd_vid);
+            goto end;
+        }
+        else {
+            node = RNODE_CDECL(node)->nd_else;
+        }
+        break;
+      case NODE_COLON2:
+        break;
+      case NODE_COLON3:
+        // ::Const
+        path = rb_str_new_cstr("::");
+        rb_str_append(path, rb_id2str(RNODE_COLON3(node)->nd_mid));
+        goto end;
+      default:
+        rb_bug("unexpected node: %s", ruby_node_name(nd_type(node)));
+        UNREACHABLE_RETURN(0);
+    }
+
+    path = rb_ary_new();
+    if (node) {
+        for (; node && nd_type_p(node, NODE_COLON2); node = RNODE_COLON2(node)->nd_head) {
+            rb_ary_push(path, rb_id2str(RNODE_COLON2(node)->nd_mid));
+        }
+        if (node && nd_type_p(node, NODE_CONST)) {
+            // Const::Name
+            rb_ary_push(path, rb_id2str(RNODE_CONST(node)->nd_vid));
+        }
+        else if (node && nd_type_p(node, NODE_COLON3)) {
+            // ::Const::Name
+            rb_ary_push(path, rb_id2str(RNODE_COLON3(node)->nd_mid));
+            rb_ary_push(path, rb_str_new(0, 0));
+        }
+        else {
+            // expression::Name
+            rb_ary_push(path, rb_str_new_cstr("..."));
+        }
+        path = rb_ary_join(rb_ary_reverse(path), rb_str_new_cstr("::"));
+    }
+  end:
+    path = rb_fstring(path);
+    return path;
+}
+
+static VALUE
+const_decl_path(NODE *dest)
+{
+    VALUE path = Qnil;
+    if (!nd_type_p(dest, NODE_CALL)) {
+        path = node_const_decl_val(dest);
+    }
+    return path;
+}
+
+static int
+compile_ensure_shareable_node(rb_iseq_t *iseq, LINK_ANCHOR *ret, NODE *dest, const NODE *value)
+{
+    /*
+     *. RubyVM::FrozenCore.ensure_shareable(value, const_decl_path(dest))
+     */
+    VALUE path = const_decl_path(dest);
+    ADD_INSN1(ret, value, putspecialobject, INT2FIX(VM_SPECIAL_OBJECT_VMCORE));
+    CHECK(COMPILE(ret, "compile_ensure_shareable_node", value));
+    ADD_INSN1(ret, value, putobject, path);
+    RB_OBJ_WRITTEN(iseq, Qundef, path);
+    ADD_SEND_WITH_FLAG(ret, value, rb_intern("ensure_shareable"), INT2FIX(2), INT2FIX(VM_CALL_ARGS_SIMPLE));
+
+    return COMPILE_OK;
+}
+
+#ifndef SHAREABLE_BARE_EXPRESSION
+#define SHAREABLE_BARE_EXPRESSION 1
+#endif
+
+static int
+compile_shareable_literal_constant(rb_iseq_t *iseq, LINK_ANCHOR *ret, enum rb_parser_shareability shareable, NODE *dest, const NODE *node, size_t level, VALUE *value_p, int *shareable_literal_p)
+{
+# define compile_shareable_literal_constant_next(node, anchor, value_p, shareable_literal_p) \
+    compile_shareable_literal_constant(iseq, anchor, shareable, dest, node, level+1, value_p, shareable_literal_p)
+    VALUE lit = Qnil;
+    DECL_ANCHOR(anchor);
+
+    enum node_type type = node ? nd_type(node) : NODE_NIL;
+    switch (type) {
+      case NODE_TRUE:
+        *value_p = Qtrue;
+        goto compile;
+      case NODE_FALSE:
+        *value_p = Qfalse;
+        goto compile;
+      case NODE_NIL:
+        *value_p = Qnil;
+        goto compile;
+      case NODE_SYM:
+        *value_p = rb_node_sym_string_val(node);
+        goto compile;
+      case NODE_REGX:
+        *value_p = rb_node_regx_string_val(node);
+        goto compile;
+      case NODE_LINE:
+        *value_p = rb_node_line_lineno_val(node);
+        goto compile;
+      case NODE_INTEGER:
+        *value_p = rb_node_integer_literal_val(node);
+        goto compile;
+      case NODE_FLOAT:
+        *value_p = rb_node_float_literal_val(node);
+        goto compile;
+      case NODE_RATIONAL:
+        *value_p = rb_node_rational_literal_val(node);
+        goto compile;
+      case NODE_IMAGINARY:
+        *value_p = rb_node_imaginary_literal_val(node);
+        goto compile;
+      case NODE_ENCODING:
+        *value_p = rb_node_encoding_val(node);
+
+      compile:
+        CHECK(COMPILE(ret, "shareable_literal_constant", node));
+        *shareable_literal_p = 1;
+        return COMPILE_OK;
+
+      case NODE_DSTR:
+        CHECK(COMPILE(ret, "shareable_literal_constant", node));
+        if (shareable == rb_parser_shareable_literal) {
+            /*
+             *  NEW_CALL(node, idUMinus, 0, loc);
+             *
+             *  -"#{var}"
+             */
+            ADD_SEND_WITH_FLAG(ret, node, idUMinus, INT2FIX(0), INT2FIX(VM_CALL_ARGS_SIMPLE));
+        }
+        *value_p = Qundef;
+        *shareable_literal_p = 1;
+        return COMPILE_OK;
+
+      case NODE_STR:{
+        VALUE lit = rb_node_str_string_val(node);
+        ADD_INSN1(ret, node, putobject, lit);
+        RB_OBJ_WRITTEN(iseq, Qundef, lit);
+        *value_p = lit;
+        *shareable_literal_p = 1;
+
+        return COMPILE_OK;
+      }
+
+      case NODE_FILE:{
+        VALUE lit = rb_node_file_path_val(node);
+        ADD_INSN1(ret, node, putobject, lit);
+        RB_OBJ_WRITTEN(iseq, Qundef, lit);
+        *value_p = lit;
+        *shareable_literal_p = 1;
+
+        return COMPILE_OK;
+      }
+
+      case NODE_ZLIST:{
+        VALUE lit = rb_ary_new();
+        OBJ_FREEZE(lit);
+        ADD_INSN1(ret, node, putobject, lit);
+        RB_OBJ_WRITTEN(iseq, Qundef, lit);
+        *value_p = lit;
+        *shareable_literal_p = 1;
+
+        return COMPILE_OK;
+      }
+
+      case NODE_LIST:{
+        INIT_ANCHOR(anchor);
+        lit = rb_ary_new();
+        for (NODE *n = (NODE *)node; n; n = RNODE_LIST(n)->nd_next) {
+            VALUE val;
+            int shareable_literal_p2;
+            NODE *elt = RNODE_LIST(n)->nd_head;
+            if (elt) {
+                CHECK(compile_shareable_literal_constant_next(elt, anchor, &val, &shareable_literal_p2));
+                if (shareable_literal_p2) {
+                    /* noop */
+                }
+                else if (RTEST(lit)) {
+                    rb_ary_clear(lit);
+                    lit = Qfalse;
+                }
+            }
+            if (RTEST(lit)) {
+                if (!UNDEF_P(val)) {
+                    rb_ary_push(lit, val);
+                }
+                else {
+                    rb_ary_clear(lit);
+                    lit = Qnil; /* make shareable at runtime */
+                }
+            }
+        }
+        break;
+      }
+      case NODE_HASH:{
+        if (!RNODE_HASH(node)->nd_brace) {
+            *value_p = Qundef;
+            *shareable_literal_p = 0;
+            return COMPILE_OK;
+        }
+        for (NODE *n = RNODE_HASH(node)->nd_head; n; n = RNODE_LIST(RNODE_LIST(n)->nd_next)->nd_next) {
+            if (!RNODE_LIST(n)->nd_head) {
+                // If the hash node have a keyword splat, fall back to the default case.
+                goto compile_shareable;
+            }
+        }
+
+        INIT_ANCHOR(anchor);
+        lit = rb_hash_new();
+        for (NODE *n = RNODE_HASH(node)->nd_head; n; n = RNODE_LIST(RNODE_LIST(n)->nd_next)->nd_next) {
+            VALUE key_val = 0;
+            VALUE value_val = 0;
+            int shareable_literal_p2;
+            NODE *key = RNODE_LIST(n)->nd_head;
+            NODE *val = RNODE_LIST(RNODE_LIST(n)->nd_next)->nd_head;
+            CHECK(compile_shareable_literal_constant_next(key, anchor, &key_val, &shareable_literal_p2));
+            if (shareable_literal_p2) {
+                /* noop */
+            }
+            else if (RTEST(lit)) {
+                rb_hash_clear(lit);
+                lit = Qfalse;
+            }
+            CHECK(compile_shareable_literal_constant_next(val, anchor, &value_val, &shareable_literal_p2));
+            if (shareable_literal_p2) {
+                /* noop */
+            }
+            else if (RTEST(lit)) {
+                rb_hash_clear(lit);
+                lit = Qfalse;
+            }
+            if (RTEST(lit)) {
+                if (!UNDEF_P(key_val) && !UNDEF_P(value_val)) {
+                    rb_hash_aset(lit, key_val, value_val);
+                }
+                else {
+                    rb_hash_clear(lit);
+                    lit = Qnil; /* make shareable at runtime */
+                }
+            }
+        }
+        break;
+      }
+
+      default:
+
+      compile_shareable:
+        if (shareable == rb_parser_shareable_literal &&
+            (SHAREABLE_BARE_EXPRESSION || level > 0)) {
+            CHECK(compile_ensure_shareable_node(iseq, ret, dest, node));
+            *value_p = Qundef;
+            *shareable_literal_p = 1;
+            return COMPILE_OK;
+        }
+        CHECK(COMPILE(ret, "shareable_literal_constant", node));
+        *value_p = Qundef;
+        *shareable_literal_p = 0;
+        return COMPILE_OK;
+    }
+
+    /* Array or Hash that does not have keyword splat */
+    if (!lit) {
+        if (nd_type(node) == NODE_LIST) {
+            ADD_INSN1(anchor, node, newarray, INT2FIX(RNODE_LIST(node)->as.nd_alen));
+        }
+        else if (nd_type(node) == NODE_HASH) {
+            int len = (int)RNODE_LIST(RNODE_HASH(node)->nd_head)->as.nd_alen;
+            ADD_INSN1(anchor, node, newhash, INT2FIX(len));
+        }
+        *value_p = Qundef;
+        *shareable_literal_p = 0;
+        ADD_SEQ(ret, anchor);
+        return COMPILE_OK;
+    }
+    if (NIL_P(lit)) {
+        // if shareable_literal, all elements should have been ensured
+        // as shareable
+        if (nd_type(node) == NODE_LIST) {
+            ADD_INSN1(anchor, node, newarray, INT2FIX(RNODE_LIST(node)->as.nd_alen));
+        }
+        else if (nd_type(node) == NODE_HASH) {
+            int len = (int)RNODE_LIST(RNODE_HASH(node)->nd_head)->as.nd_alen;
+            ADD_INSN1(anchor, node, newhash, INT2FIX(len));
+        }
+        CHECK(compile_make_shareable_node(iseq, ret, anchor, node, false));
+        *value_p = Qundef;
+        *shareable_literal_p = 1;
+    }
+    else {
+        VALUE val = rb_ractor_make_shareable(lit);
+        ADD_INSN1(ret, node, putobject, val);
+        RB_OBJ_WRITTEN(iseq, Qundef, val);
+        *value_p = val;
+        *shareable_literal_p = 1;
+    }
+
+    return COMPILE_OK;
+}
+
+static int
+compile_shareable_constant_value(rb_iseq_t *iseq, LINK_ANCHOR *ret, enum rb_parser_shareability shareable, const NODE *lhs, const NODE *value)
+{
+    int literal_p = 0;
+    VALUE val;
+    DECL_ANCHOR(anchor);
+    INIT_ANCHOR(anchor);
+
+    switch (shareable) {
+      case rb_parser_shareable_none:
+        CHECK(COMPILE(ret, "compile_shareable_constant_value", value));
+        return COMPILE_OK;
+
+      case rb_parser_shareable_literal:
+        CHECK(compile_shareable_literal_constant(iseq, anchor, shareable, (NODE *)lhs, value, 0, &val, &literal_p));
+        ADD_SEQ(ret, anchor);
+        return COMPILE_OK;
+
+      case rb_parser_shareable_copy:
+      case rb_parser_shareable_everything:
+        CHECK(compile_shareable_literal_constant(iseq, anchor, shareable, (NODE *)lhs, value, 0, &val, &literal_p));
+        if (!literal_p) {
+            CHECK(compile_make_shareable_node(iseq, ret, anchor, value, shareable == rb_parser_shareable_copy));
+        }
+        else {
+            ADD_SEQ(ret, anchor);
+        }
+        return COMPILE_OK;
+      default:
+        rb_bug("unexpected rb_parser_shareability: %d", shareable);
+    }
+}
+
 static int iseq_compile_each0(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE *const node, int popped);
 /**
   compile each node
@@ -9102,8 +10818,7 @@ iseq_compile_each(rb_iseq_t *iseq, LINK_ANCHOR *ret, const NODE *node, int poppe
             int lineno = ISEQ_COMPILE_DATA(iseq)->last_line;
             if (lineno == 0) lineno = FIX2INT(rb_iseq_first_lineno(iseq));
             debugs("node: NODE_NIL(implicit)\n");
-            NODE dummy_line_node = generate_dummy_line_node(lineno, -1);
-            ADD_INSN(ret, &dummy_line_node, putnil);
+            ADD_SYNTHETIC_INSN(ret, lineno, -1, putnil);
         }
         return COMPILE_OK;
     }
@@ -9118,17 +10833,17 @@ iseq_compile_each0(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE *const no
     struct rb_iseq_constant_body *const body = ISEQ_BODY(iseq);
 
     if (ISEQ_COMPILE_DATA(iseq)->last_line == line) {
-	/* ignore */
+        /* ignore */
     }
     else {
-	if (node->flags & NODE_FL_NEWLINE) {
-	    int event = RUBY_EVENT_LINE;
-	    ISEQ_COMPILE_DATA(iseq)->last_line = line;
-	    if (ISEQ_COVERAGE(iseq) && ISEQ_LINE_COVERAGE(iseq)) {
-		event |= RUBY_EVENT_COVERAGE_LINE;
-	    }
-	    ADD_TRACE(ret, event);
-	}
+        if (nd_fl_newline(node)) {
+            int event = RUBY_EVENT_LINE;
+            ISEQ_COMPILE_DATA(iseq)->last_line = line;
+            if (line > 0 && ISEQ_COVERAGE(iseq) && ISEQ_LINE_COVERAGE(iseq)) {
+                event |= RUBY_EVENT_COVERAGE_LINE;
+            }
+            ADD_TRACE(ret, event);
+        }
     }
 
     debug_node_start(node);
@@ -9138,150 +10853,150 @@ iseq_compile_each0(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE *const no
     switch (type) {
       case NODE_BLOCK:
         CHECK(compile_block(iseq, ret, node, popped));
-	break;
+        break;
       case NODE_IF:
       case NODE_UNLESS:
-	CHECK(compile_if(iseq, ret, node, popped, type));
-	break;
+        CHECK(compile_if(iseq, ret, node, popped, type));
+        break;
       case NODE_CASE:
-	CHECK(compile_case(iseq, ret, node, popped));
-	break;
+        CHECK(compile_case(iseq, ret, node, popped));
+        break;
       case NODE_CASE2:
-	CHECK(compile_case2(iseq, ret, node, popped));
-	break;
+        CHECK(compile_case2(iseq, ret, node, popped));
+        break;
       case NODE_CASE3:
         CHECK(compile_case3(iseq, ret, node, popped));
         break;
       case NODE_WHILE:
       case NODE_UNTIL:
-	CHECK(compile_loop(iseq, ret, node, popped, type));
-	break;
+        CHECK(compile_loop(iseq, ret, node, popped, type));
+        break;
       case NODE_FOR:
       case NODE_ITER:
-	CHECK(compile_iter(iseq, ret, node, popped));
-	break;
+        CHECK(compile_iter(iseq, ret, node, popped));
+        break;
       case NODE_FOR_MASGN:
-	CHECK(compile_for_masgn(iseq, ret, node, popped));
-	break;
+        CHECK(compile_for_masgn(iseq, ret, node, popped));
+        break;
       case NODE_BREAK:
-	CHECK(compile_break(iseq, ret, node, popped));
-	break;
+        CHECK(compile_break(iseq, ret, node, popped));
+        break;
       case NODE_NEXT:
-	CHECK(compile_next(iseq, ret, node, popped));
-	break;
+        CHECK(compile_next(iseq, ret, node, popped));
+        break;
       case NODE_REDO:
-	CHECK(compile_redo(iseq, ret, node, popped));
-	break;
+        CHECK(compile_redo(iseq, ret, node, popped));
+        break;
       case NODE_RETRY:
-	CHECK(compile_retry(iseq, ret, node, popped));
-	break;
+        CHECK(compile_retry(iseq, ret, node, popped));
+        break;
       case NODE_BEGIN:{
-	CHECK(COMPILE_(ret, "NODE_BEGIN", node->nd_body, popped));
-	break;
+        CHECK(COMPILE_(ret, "NODE_BEGIN", RNODE_BEGIN(node)->nd_body, popped));
+        break;
       }
       case NODE_RESCUE:
-	CHECK(compile_rescue(iseq, ret, node, popped));
-	break;
+        CHECK(compile_rescue(iseq, ret, node, popped));
+        break;
       case NODE_RESBODY:
-	CHECK(compile_resbody(iseq, ret, node, popped));
-	break;
+        CHECK(compile_resbody(iseq, ret, node, popped));
+        break;
       case NODE_ENSURE:
-	CHECK(compile_ensure(iseq, ret, node, popped));
-	break;
+        CHECK(compile_ensure(iseq, ret, node, popped));
+        break;
 
       case NODE_AND:
       case NODE_OR:{
-	LABEL *end_label = NEW_LABEL(line);
-	CHECK(COMPILE(ret, "nd_1st", node->nd_1st));
-	if (!popped) {
-	    ADD_INSN(ret, node, dup);
-	}
-	if (type == NODE_AND) {
-	    ADD_INSNL(ret, node, branchunless, end_label);
-	}
-	else {
-	    ADD_INSNL(ret, node, branchif, end_label);
-	}
-	if (!popped) {
-	    ADD_INSN(ret, node, pop);
-	}
-	CHECK(COMPILE_(ret, "nd_2nd", node->nd_2nd, popped));
-	ADD_LABEL(ret, end_label);
-	break;
+        LABEL *end_label = NEW_LABEL(line);
+        CHECK(COMPILE(ret, "nd_1st", RNODE_OR(node)->nd_1st));
+        if (!popped) {
+            ADD_INSN(ret, node, dup);
+        }
+        if (type == NODE_AND) {
+            ADD_INSNL(ret, node, branchunless, end_label);
+        }
+        else {
+            ADD_INSNL(ret, node, branchif, end_label);
+        }
+        if (!popped) {
+            ADD_INSN(ret, node, pop);
+        }
+        CHECK(COMPILE_(ret, "nd_2nd", RNODE_OR(node)->nd_2nd, popped));
+        ADD_LABEL(ret, end_label);
+        break;
       }
 
       case NODE_MASGN:{
-	compile_massign(iseq, ret, node, popped);
-	break;
+        compile_massign(iseq, ret, node, popped);
+        break;
       }
 
       case NODE_LASGN:{
-	ID id = node->nd_vid;
+        ID id = RNODE_LASGN(node)->nd_vid;
         int idx = ISEQ_BODY(body->local_iseq)->local_table_size - get_local_var_idx(iseq, id);
 
-	debugs("lvar: %s idx: %d\n", rb_id2name(id), idx);
-	CHECK(COMPILE(ret, "rvalue", node->nd_value));
+        debugs("lvar: %s idx: %d\n", rb_id2name(id), idx);
+        CHECK(COMPILE(ret, "rvalue", RNODE_LASGN(node)->nd_value));
 
-	if (!popped) {
-	    ADD_INSN(ret, node, dup);
-	}
-	ADD_SETLOCAL(ret, node, idx, get_lvar_level(iseq));
-	break;
+        if (!popped) {
+            ADD_INSN(ret, node, dup);
+        }
+        ADD_SETLOCAL(ret, node, idx, get_lvar_level(iseq));
+        break;
       }
       case NODE_DASGN: {
-	int idx, lv, ls;
-	ID id = node->nd_vid;
-	CHECK(COMPILE(ret, "dvalue", node->nd_value));
-	debugi("dassn id", rb_id2str(id) ? id : '*');
-
-	if (!popped) {
-	    ADD_INSN(ret, node, dup);
-	}
-
-	idx = get_dyna_var_idx(iseq, id, &lv, &ls);
-
-	if (idx < 0) {
-	    COMPILE_ERROR(ERROR_ARGS "NODE_DASGN: unknown id (%"PRIsVALUE")",
-			  rb_id2str(id));
-	    goto ng;
-	}
-	ADD_SETLOCAL(ret, node, ls - idx, lv);
-	break;
+        int idx, lv, ls;
+        ID id = RNODE_DASGN(node)->nd_vid;
+        CHECK(COMPILE(ret, "dvalue", RNODE_DASGN(node)->nd_value));
+        debugi("dassn id", rb_id2str(id) ? id : '*');
+
+        if (!popped) {
+            ADD_INSN(ret, node, dup);
+        }
+
+        idx = get_dyna_var_idx(iseq, id, &lv, &ls);
+
+        if (idx < 0) {
+            COMPILE_ERROR(ERROR_ARGS "NODE_DASGN: unknown id (%"PRIsVALUE")",
+                          rb_id2str(id));
+            goto ng;
+        }
+        ADD_SETLOCAL(ret, node, ls - idx, lv);
+        break;
       }
       case NODE_GASGN:{
-	CHECK(COMPILE(ret, "lvalue", node->nd_value));
+        CHECK(COMPILE(ret, "lvalue", RNODE_GASGN(node)->nd_value));
 
-	if (!popped) {
-	    ADD_INSN(ret, node, dup);
-	}
-	ADD_INSN1(ret, node, setglobal, ID2SYM(node->nd_entry));
-	break;
+        if (!popped) {
+            ADD_INSN(ret, node, dup);
+        }
+        ADD_INSN1(ret, node, setglobal, ID2SYM(RNODE_GASGN(node)->nd_vid));
+        break;
       }
       case NODE_IASGN:{
-	CHECK(COMPILE(ret, "lvalue", node->nd_value));
-	if (!popped) {
-	    ADD_INSN(ret, node, dup);
-	}
-	ADD_INSN2(ret, node, setinstancevariable,
-		  ID2SYM(node->nd_vid),
-		  get_ivar_ic_value(iseq,node->nd_vid));
-	break;
+        CHECK(COMPILE(ret, "lvalue", RNODE_IASGN(node)->nd_value));
+        if (!popped) {
+            ADD_INSN(ret, node, dup);
+        }
+        ADD_INSN2(ret, node, setinstancevariable,
+                  ID2SYM(RNODE_IASGN(node)->nd_vid),
+                  get_ivar_ic_value(iseq,RNODE_IASGN(node)->nd_vid));
+        break;
       }
       case NODE_CDECL:{
-        if (node->nd_vid) {
-            CHECK(COMPILE(ret, "lvalue", node->nd_value));
+        if (RNODE_CDECL(node)->nd_vid) {
+            CHECK(compile_shareable_constant_value(iseq, ret, RNODE_CDECL(node)->shareability, node, RNODE_CDECL(node)->nd_value));
 
             if (!popped) {
                 ADD_INSN(ret, node, dup);
             }
 
-	    ADD_INSN1(ret, node, putspecialobject,
-		      INT2FIX(VM_SPECIAL_OBJECT_CONST_BASE));
-            ADD_INSN1(ret, node, setconstant, ID2SYM(node->nd_vid));
-	}
-	else {
-	    compile_cpath(ret, iseq, node->nd_else);
-            CHECK(COMPILE(ret, "lvalue", node->nd_value));
+            ADD_INSN1(ret, node, putspecialobject,
+                      INT2FIX(VM_SPECIAL_OBJECT_CONST_BASE));
+            ADD_INSN1(ret, node, setconstant, ID2SYM(RNODE_CDECL(node)->nd_vid));
+        }
+        else {
+            compile_cpath(ret, iseq, RNODE_CDECL(node)->nd_else);
+            CHECK(compile_shareable_constant_value(iseq, ret, RNODE_CDECL(node)->shareability, node, RNODE_CDECL(node)->nd_value));
             ADD_INSN(ret, node, swap);
 
             if (!popped) {
@@ -9289,33 +11004,33 @@ iseq_compile_each0(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE *const no
                 ADD_INSN(ret, node, swap);
             }
 
-            ADD_INSN1(ret, node, setconstant, ID2SYM(node->nd_else->nd_mid));
-	}
-	break;
+            ADD_INSN1(ret, node, setconstant, ID2SYM(get_node_colon_nd_mid(RNODE_CDECL(node)->nd_else)));
+        }
+        break;
       }
       case NODE_CVASGN:{
-	CHECK(COMPILE(ret, "cvasgn val", node->nd_value));
-	if (!popped) {
-	    ADD_INSN(ret, node, dup);
-	}
+        CHECK(COMPILE(ret, "cvasgn val", RNODE_CVASGN(node)->nd_value));
+        if (!popped) {
+            ADD_INSN(ret, node, dup);
+        }
         ADD_INSN2(ret, node, setclassvariable,
-                  ID2SYM(node->nd_vid),
-                  get_ivar_ic_value(iseq,node->nd_vid));
-	break;
+                  ID2SYM(RNODE_CVASGN(node)->nd_vid),
+                  get_cvar_ic_value(iseq, RNODE_CVASGN(node)->nd_vid));
+        break;
       }
       case NODE_OP_ASGN1:
-	CHECK(compile_op_asgn1(iseq, ret, node, popped));
-	break;
+        CHECK(compile_op_asgn1(iseq, ret, node, popped));
+        break;
       case NODE_OP_ASGN2:
-	CHECK(compile_op_asgn2(iseq, ret, node, popped));
-	break;
+        CHECK(compile_op_asgn2(iseq, ret, node, popped));
+        break;
       case NODE_OP_CDECL:
-	CHECK(compile_op_cdecl(iseq, ret, node, popped));
-	break;
+        CHECK(compile_op_cdecl(iseq, ret, node, popped));
+        break;
       case NODE_OP_ASGN_AND:
       case NODE_OP_ASGN_OR:
-	CHECK(compile_op_log(iseq, ret, node, popped, type));
-	break;
+        CHECK(compile_op_log(iseq, ret, node, popped, type));
+        break;
       case NODE_CALL:   /* obj.foo */
       case NODE_OPCALL: /* foo[] */
         if (compile_call_precheck_freeze(iseq, ret, node, node, popped) == TRUE) {
@@ -9330,486 +11045,552 @@ iseq_compile_each0(rb_iseq_t *iseq, LINK_ANCHOR *const ret, const NODE *const no
         break;
       case NODE_SUPER:
       case NODE_ZSUPER:
-	CHECK(compile_super(iseq, ret, node, popped, type));
-	break;
+        CHECK(compile_super(iseq, ret, node, popped, type));
+        break;
       case NODE_LIST:{
-        CHECK(compile_array(iseq, ret, node, popped) >= 0);
-	break;
+        CHECK(compile_array(iseq, ret, node, popped, TRUE) >= 0);
+        break;
       }
       case NODE_ZLIST:{
-	if (!popped) {
-	    ADD_INSN1(ret, node, newarray, INT2FIX(0));
-	}
-	break;
-      }
-      case NODE_VALUES:{
-	const NODE *n = node;
-	if (popped) {
-	    COMPILE_ERROR(ERROR_ARGS "NODE_VALUES: must not be popped");
-	}
-	while (n) {
-	    CHECK(COMPILE(ret, "values item", n->nd_head));
-	    n = n->nd_next;
-	}
-	ADD_INSN1(ret, node, newarray, INT2FIX(node->nd_alen));
-	break;
+        if (!popped) {
+            ADD_INSN1(ret, node, newarray, INT2FIX(0));
+        }
+        break;
       }
       case NODE_HASH:
         CHECK(compile_hash(iseq, ret, node, FALSE, popped) >= 0);
         break;
       case NODE_RETURN:
-	CHECK(compile_return(iseq, ret, node, popped));
-	break;
+        CHECK(compile_return(iseq, ret, node, popped));
+        break;
       case NODE_YIELD:
-	CHECK(compile_yield(iseq, ret, node, popped));
-	break;
+        CHECK(compile_yield(iseq, ret, node, popped));
+        break;
       case NODE_LVAR:{
-	if (!popped) {
-	    compile_lvar(iseq, ret, node, node->nd_vid);
-	}
-	break;
+        if (!popped) {
+            compile_lvar(iseq, ret, node, RNODE_LVAR(node)->nd_vid);
+        }
+        break;
       }
       case NODE_DVAR:{
-	int lv, idx, ls;
-	debugi("nd_vid", node->nd_vid);
-	if (!popped) {
-	    idx = get_dyna_var_idx(iseq, node->nd_vid, &lv, &ls);
-	    if (idx < 0) {
-		COMPILE_ERROR(ERROR_ARGS "unknown dvar (%"PRIsVALUE")",
-			      rb_id2str(node->nd_vid));
-		goto ng;
-	    }
-	    ADD_GETLOCAL(ret, node, ls - idx, lv);
-	}
-	break;
+        int lv, idx, ls;
+        debugi("nd_vid", RNODE_DVAR(node)->nd_vid);
+        if (!popped) {
+            idx = get_dyna_var_idx(iseq, RNODE_DVAR(node)->nd_vid, &lv, &ls);
+            if (idx < 0) {
+                COMPILE_ERROR(ERROR_ARGS "unknown dvar (%"PRIsVALUE")",
+                              rb_id2str(RNODE_DVAR(node)->nd_vid));
+                goto ng;
+            }
+            ADD_GETLOCAL(ret, node, ls - idx, lv);
+        }
+        break;
       }
       case NODE_GVAR:{
-	ADD_INSN1(ret, node, getglobal, ID2SYM(node->nd_entry));
-	if (popped) {
-	    ADD_INSN(ret, node, pop);
-	}
-	break;
+        ADD_INSN1(ret, node, getglobal, ID2SYM(RNODE_GVAR(node)->nd_vid));
+        if (popped) {
+            ADD_INSN(ret, node, pop);
+        }
+        break;
       }
       case NODE_IVAR:{
-	debugi("nd_vid", node->nd_vid);
-	if (!popped) {
-	    ADD_INSN2(ret, node, getinstancevariable,
-		      ID2SYM(node->nd_vid),
-		      get_ivar_ic_value(iseq,node->nd_vid));
-	}
-	break;
+        debugi("nd_vid", RNODE_IVAR(node)->nd_vid);
+        if (!popped) {
+            ADD_INSN2(ret, node, getinstancevariable,
+                      ID2SYM(RNODE_IVAR(node)->nd_vid),
+                      get_ivar_ic_value(iseq, RNODE_IVAR(node)->nd_vid));
+        }
+        break;
       }
       case NODE_CONST:{
-	debugi("nd_vid", node->nd_vid);
-
-	if (ISEQ_COMPILE_DATA(iseq)->option->inline_const_cache) {
-	    LABEL *lend = NEW_LABEL(line);
-	    int ic_index = body->is_size++;
-
-            ADD_INSN2(ret, node, opt_getinlinecache, lend, INT2FIX(ic_index));
-            ADD_INSN1(ret, node, putobject, Qtrue);
-            ADD_INSN1(ret, node, getconstant, ID2SYM(node->nd_vid));
-            ADD_INSN1(ret, node, opt_setinlinecache, INT2FIX(ic_index));
-	    ADD_LABEL(ret, lend);
-	}
-	else {
-	    ADD_INSN(ret, node, putnil);
+        debugi("nd_vid", RNODE_CONST(node)->nd_vid);
+
+        if (ISEQ_COMPILE_DATA(iseq)->option->inline_const_cache) {
+            body->ic_size++;
+            VALUE segments = rb_ary_new_from_args(1, ID2SYM(RNODE_CONST(node)->nd_vid));
+            RB_OBJ_SET_FROZEN_SHAREABLE(segments);
+            ADD_INSN1(ret, node, opt_getconstant_path, segments);
+            RB_OBJ_WRITTEN(iseq, Qundef, segments);
+        }
+        else {
+            ADD_INSN(ret, node, putnil);
             ADD_INSN1(ret, node, putobject, Qtrue);
-            ADD_INSN1(ret, node, getconstant, ID2SYM(node->nd_vid));
-	}
+            ADD_INSN1(ret, node, getconstant, ID2SYM(RNODE_CONST(node)->nd_vid));
+        }
 
-	if (popped) {
-	    ADD_INSN(ret, node, pop);
-	}
-	break;
+        if (popped) {
+            ADD_INSN(ret, node, pop);
+        }
+        break;
       }
       case NODE_CVAR:{
-	if (!popped) {
-	    ADD_INSN2(ret, node, getclassvariable,
-		      ID2SYM(node->nd_vid),
-		      get_ivar_ic_value(iseq,node->nd_vid));
-	}
-	break;
+        if (!popped) {
+            ADD_INSN2(ret, node, getclassvariable,
+                      ID2SYM(RNODE_CVAR(node)->nd_vid),
+                      get_cvar_ic_value(iseq, RNODE_CVAR(node)->nd_vid));
+        }
+        break;
       }
       case NODE_NTH_REF:{
         if (!popped) {
-	    if (!node->nd_nth) {
-		ADD_INSN(ret, node, putnil);
-		break;
-	    }
-	    ADD_INSN2(ret, node, getspecial, INT2FIX(1) /* '~'  */,
-		      INT2FIX(node->nd_nth << 1));
-	}
-	break;
+            if (!RNODE_NTH_REF(node)->nd_nth) {
+                ADD_INSN(ret, node, putnil);
+                break;
+            }
+            ADD_INSN2(ret, node, getspecial, INT2FIX(1) /* '~'  */,
+                      INT2FIX(RNODE_NTH_REF(node)->nd_nth << 1));
+        }
+        break;
       }
       case NODE_BACK_REF:{
-	if (!popped) {
-	    ADD_INSN2(ret, node, getspecial, INT2FIX(1) /* '~' */,
-		      INT2FIX(0x01 | (node->nd_nth << 1)));
-	}
-	break;
+        if (!popped) {
+            ADD_INSN2(ret, node, getspecial, INT2FIX(1) /* '~' */,
+                      INT2FIX(0x01 | (RNODE_BACK_REF(node)->nd_nth << 1)));
+        }
+        break;
       }
       case NODE_MATCH:
       case NODE_MATCH2:
       case NODE_MATCH3:
-	CHECK(compile_match(iseq, ret, node, popped, type));
-	break;
-      case NODE_LIT:{
-	debugp_param("lit", node->nd_lit);
-	if (!popped) {
-	    ADD_INSN1(ret, node, putobject, node->nd_lit);
-            RB_OBJ_WRITTEN(iseq, Qundef, node->nd_lit);
-	}
-	break;
+        CHECK(compile_match(iseq, ret, node, popped, type));
+        break;
+      case NODE_SYM:{
+        if (!popped) {
+            ADD_INSN1(ret, node, putobject, rb_node_sym_string_val(node));
+        }
+        break;
       }
+      case NODE_LINE:{
+        if (!popped) {
+            ADD_INSN1(ret, node, putobject, rb_node_line_lineno_val(node));
+        }
+        break;
+      }
+      case NODE_ENCODING:{
+        if (!popped) {
+            ADD_INSN1(ret, node, putobject, rb_node_encoding_val(node));
+        }
+        break;
+      }
+      case NODE_INTEGER:{
+        VALUE lit = rb_node_integer_literal_val(node);
+        if (!SPECIAL_CONST_P(lit)) RB_OBJ_SET_SHAREABLE(lit);
+        debugp_param("integer", lit);
+        if (!popped) {
+            ADD_INSN1(ret, node, putobject, lit);
+            RB_OBJ_WRITTEN(iseq, Qundef, lit);
+        }
+        break;
+      }
+      case NODE_FLOAT:{
+        VALUE lit = rb_node_float_literal_val(node);
+        if (!SPECIAL_CONST_P(lit)) RB_OBJ_SET_SHAREABLE(lit);
+        debugp_param("float", lit);
+        if (!popped) {
+            ADD_INSN1(ret, node, putobject, lit);
+            RB_OBJ_WRITTEN(iseq, Qundef, lit);
+        }
+        break;
+      }
+      case NODE_RATIONAL:{
+        VALUE lit = rb_node_rational_literal_val(node);
+        rb_ractor_make_shareable(lit);
+        debugp_param("rational", lit);
+        if (!popped) {
+            ADD_INSN1(ret, node, putobject, lit);
+            RB_OBJ_WRITTEN(iseq, Qundef, lit);
+        }
+        break;
+      }
+      case NODE_IMAGINARY:{
+        VALUE lit = rb_node_imaginary_literal_val(node);
+        rb_ractor_make_shareable(lit);
+        debugp_param("imaginary", lit);
+        if (!popped) {
+            ADD_INSN1(ret, node, putobject, lit);
+            RB_OBJ_WRITTEN(iseq, Qundef, lit);
+        }
+        break;
+      }
+      case NODE_FILE:
       case NODE_STR:{
-	debugp_param("nd_lit", node->nd_lit);
-	if (!popped) {
-	    VALUE lit = node->nd_lit;
-	    if (!ISEQ_COMPILE_DATA(iseq)->option->frozen_string_literal) {
-		lit = rb_fstring(lit);
-		ADD_INSN1(ret, node, putstring, lit);
-                RB_OBJ_WRITTEN(iseq, Qundef, lit);
-	    }
-	    else {
-		if (ISEQ_COMPILE_DATA(iseq)->option->debug_frozen_string_literal || RTEST(ruby_debug)) {
-		    VALUE debug_info = rb_ary_new_from_args(2, rb_iseq_path(iseq), INT2FIX(line));
-		    lit = rb_str_dup(lit);
-		    rb_ivar_set(lit, id_debug_created_info, rb_obj_freeze(debug_info));
-		    lit = rb_str_freeze(lit);
-		}
-		else {
-		    lit = rb_fstring(lit);
-		}
-		ADD_INSN1(ret, node, putobject, lit);
-                RB_OBJ_WRITTEN(iseq, Qundef, lit);
-	    }
-	}
-	break;
+        debugp_param("nd_lit", get_string_value(node));
+        if (!popped) {
+            VALUE lit = get_string_value(node);
+            const rb_compile_option_t *option = ISEQ_COMPILE_DATA(iseq)->option;
+            if ((option->debug_frozen_string_literal || RTEST(ruby_debug)) &&
+                option->frozen_string_literal != ISEQ_FROZEN_STRING_LITERAL_DISABLED) {
+                lit = rb_str_with_debug_created_info(lit, rb_iseq_path(iseq), line);
+                RB_OBJ_SET_SHAREABLE(lit);
+            }
+            switch (option->frozen_string_literal) {
+              case ISEQ_FROZEN_STRING_LITERAL_UNSET:
+                ADD_INSN1(ret, node, putchilledstring, lit);
+                break;
+              case ISEQ_FROZEN_STRING_LITERAL_DISABLED:
+                ADD_INSN1(ret, node, putstring, lit);
+                break;
+              case ISEQ_FROZEN_STRING_LITERAL_ENABLED:
+                ADD_INSN1(ret, node, putobject, lit);
+                break;
+              default:
+                rb_bug("invalid frozen_string_literal");
+            }
+            RB_OBJ_WRITTEN(iseq, Qundef, lit);
+        }
+        break;
       }
       case NODE_DSTR:{
-	compile_dstr(iseq, ret, node);
+        compile_dstr(iseq, ret, node);
 
-	if (popped) {
-	    ADD_INSN(ret, node, pop);
-	}
-	break;
+        if (popped) {
+            ADD_INSN(ret, node, pop);
+        }
+        break;
       }
       case NODE_XSTR:{
-	ADD_CALL_RECEIVER(ret, node);
-        VALUE str = rb_fstring(node->nd_lit);
-	ADD_INSN1(ret, node, putobject, str);
+        ADD_CALL_RECEIVER(ret, node);
+        VALUE str = rb_node_str_string_val(node);
+        ADD_INSN1(ret, node, putobject, str);
         RB_OBJ_WRITTEN(iseq, Qundef, str);
-	ADD_CALL(ret, node, idBackquote, INT2FIX(1));
+        ADD_CALL(ret, node, idBackquote, INT2FIX(1));
 
-	if (popped) {
-	    ADD_INSN(ret, node, pop);
-	}
-	break;
+        if (popped) {
+            ADD_INSN(ret, node, pop);
+        }
+        break;
       }
       case NODE_DXSTR:{
-	ADD_CALL_RECEIVER(ret, node);
-	compile_dstr(iseq, ret, node);
-	ADD_CALL(ret, node, idBackquote, INT2FIX(1));
-
-	if (popped) {
-	    ADD_INSN(ret, node, pop);
-	}
-	break;
+        ADD_CALL_RECEIVER(ret, node);
+        compile_dstr(iseq, ret, node);
+        ADD_CALL(ret, node, idBackquote, INT2FIX(1));
+
+        if (popped) {
+            ADD_INSN(ret, node, pop);
+        }
+        break;
       }
       case NODE_EVSTR:
-	CHECK(compile_evstr(iseq, ret, node->nd_body, popped));
-	break;
-      case NODE_DREGX:{
-	compile_dregx(iseq, ret, node);
-
-	if (popped) {
-	    ADD_INSN(ret, node, pop);
-	}
-	break;
+        CHECK(compile_evstr(iseq, ret, RNODE_EVSTR(node)->nd_body, popped));
+        break;
+      case NODE_REGX:{
+        if (!popped) {
+            VALUE lit = rb_node_regx_string_val(node);
+            RB_OBJ_SET_SHAREABLE(lit);
+            ADD_INSN1(ret, node, putobject, lit);
+            RB_OBJ_WRITTEN(iseq, Qundef, lit);
+        }
+        break;
       }
+      case NODE_DREGX:
+        compile_dregx(iseq, ret, node, popped);
+        break;
       case NODE_ONCE:{
-	int ic_index = body->is_size++;
-	const rb_iseq_t *block_iseq;
-	block_iseq = NEW_CHILD_ISEQ(node->nd_body, make_name_for_block(iseq), ISEQ_TYPE_PLAIN, line);
+        int ic_index = body->ise_size++;
+        const rb_iseq_t *block_iseq;
+        block_iseq = NEW_CHILD_ISEQ(RNODE_ONCE(node)->nd_body, make_name_for_block(iseq), ISEQ_TYPE_PLAIN, line);
 
-	ADD_INSN2(ret, node, once, block_iseq, INT2FIX(ic_index));
+        ADD_INSN2(ret, node, once, block_iseq, INT2FIX(ic_index));
         RB_OBJ_WRITTEN(iseq, Qundef, (VALUE)block_iseq);
 
-	if (popped) {
-	    ADD_INSN(ret, node, pop);
-	}
-	break;
+        if (popped) {
+            ADD_INSN(ret, node, pop);
+        }
+        break;
       }
       case NODE_ARGSCAT:{
-	if (popped) {
-	    CHECK(COMPILE(ret, "argscat head", node->nd_head));
-	    ADD_INSN1(ret, node, splatarray, Qfalse);
-	    ADD_INSN(ret, node, pop);
-	    CHECK(COMPILE(ret, "argscat body", node->nd_body));
-	    ADD_INSN1(ret, node, splatarray, Qfalse);
-	    ADD_INSN(ret, node, pop);
-	}
-	else {
-	    CHECK(COMPILE(ret, "argscat head", node->nd_head));
-	    CHECK(COMPILE(ret, "argscat body", node->nd_body));
-	    ADD_INSN(ret, node, concatarray);
-	}
-	break;
+        if (popped) {
+            CHECK(COMPILE(ret, "argscat head", RNODE_ARGSCAT(node)->nd_head));
+            ADD_INSN1(ret, node, splatarray, Qfalse);
+            ADD_INSN(ret, node, pop);
+            CHECK(COMPILE(ret, "argscat body", RNODE_ARGSCAT(node)->nd_body));
+            ADD_INSN1(ret, node, splatarray, Qfalse);
+            ADD_INSN(ret, node, pop);
+        }
+        else {
+            CHECK(COMPILE(ret, "argscat head", RNODE_ARGSCAT(node)->nd_head));
+            const NODE *body_node = RNODE_ARGSCAT(node)->nd_body;
+            if (nd_type_p(body_node, NODE_LIST)) {
+                CHECK(compile_array(iseq, ret, body_node, popped, FALSE) >= 0);
+            }
+            else {
+                CHECK(COMPILE(ret, "argscat body", body_node));
+                ADD_INSN(ret, node, concattoarray);
+            }
+        }
+        break;
       }
       case NODE_ARGSPUSH:{
-	if (popped) {
-	    CHECK(COMPILE(ret, "argspush head", node->nd_head));
-	    ADD_INSN1(ret, node, splatarray, Qfalse);
-	    ADD_INSN(ret, node, pop);
-	    CHECK(COMPILE_(ret, "argspush body", node->nd_body, popped));
-	}
-	else {
-	    CHECK(COMPILE(ret, "argspush head", node->nd_head));
-	    CHECK(compile_array_1(iseq, ret, node->nd_body));
-	    ADD_INSN(ret, node, concatarray);
-	}
-	break;
+        if (popped) {
+            CHECK(COMPILE(ret, "argspush head", RNODE_ARGSPUSH(node)->nd_head));
+            ADD_INSN1(ret, node, splatarray, Qfalse);
+            ADD_INSN(ret, node, pop);
+            CHECK(COMPILE_(ret, "argspush body", RNODE_ARGSPUSH(node)->nd_body, popped));
+        }
+        else {
+            CHECK(COMPILE(ret, "argspush head", RNODE_ARGSPUSH(node)->nd_head));
+            const NODE *body_node = RNODE_ARGSPUSH(node)->nd_body;
+            if (keyword_node_p(body_node)) {
+                CHECK(COMPILE_(ret, "array element", body_node, FALSE));
+                ADD_INSN(ret, node, pushtoarraykwsplat);
+            }
+            else if (static_literal_node_p(body_node, iseq, false)) {
+                ADD_INSN1(ret, body_node, putobject, static_literal_value(body_node, iseq));
+                ADD_INSN1(ret, node, pushtoarray, INT2FIX(1));
+            }
+            else {
+                CHECK(COMPILE_(ret, "array element", body_node, FALSE));
+                ADD_INSN1(ret, node, pushtoarray, INT2FIX(1));
+            }
+        }
+        break;
       }
       case NODE_SPLAT:{
-	CHECK(COMPILE(ret, "splat", node->nd_head));
-	ADD_INSN1(ret, node, splatarray, Qtrue);
+        CHECK(COMPILE(ret, "splat", RNODE_SPLAT(node)->nd_head));
+        ADD_INSN1(ret, node, splatarray, Qtrue);
 
-	if (popped) {
-	    ADD_INSN(ret, node, pop);
-	}
-	break;
+        if (popped) {
+            ADD_INSN(ret, node, pop);
+        }
+        break;
       }
       case NODE_DEFN:{
-        ID mid = node->nd_mid;
-	const rb_iseq_t *method_iseq = NEW_ISEQ(node->nd_defn,
+        ID mid = RNODE_DEFN(node)->nd_mid;
+        const rb_iseq_t *method_iseq = NEW_ISEQ(RNODE_DEFN(node)->nd_defn,
                                                 rb_id2str(mid),
-						ISEQ_TYPE_METHOD, line);
+                                                ISEQ_TYPE_METHOD, line);
 
-	debugp_param("defn/iseq", rb_iseqw_new(method_iseq));
+        debugp_param("defn/iseq", rb_iseqw_new(method_iseq));
         ADD_INSN2(ret, node, definemethod, ID2SYM(mid), method_iseq);
         RB_OBJ_WRITTEN(iseq, Qundef, (VALUE)method_iseq);
 
         if (!popped) {
             ADD_INSN1(ret, node, putobject, ID2SYM(mid));
-	}
+        }
 
-	break;
+        break;
       }
       case NODE_DEFS:{
-        ID mid = node->nd_mid;
-        const rb_iseq_t * singleton_method_iseq = NEW_ISEQ(node->nd_defn,
+        ID mid = RNODE_DEFS(node)->nd_mid;
+        const rb_iseq_t * singleton_method_iseq = NEW_ISEQ(RNODE_DEFS(node)->nd_defn,
                                                            rb_id2str(mid),
                                                            ISEQ_TYPE_METHOD, line);
 
         debugp_param("defs/iseq", rb_iseqw_new(singleton_method_iseq));
-        CHECK(COMPILE(ret, "defs: recv", node->nd_recv));
+        CHECK(COMPILE(ret, "defs: recv", RNODE_DEFS(node)->nd_recv));
         ADD_INSN2(ret, node, definesmethod, ID2SYM(mid), singleton_method_iseq);
         RB_OBJ_WRITTEN(iseq, Qundef, (VALUE)singleton_method_iseq);
 
         if (!popped) {
             ADD_INSN1(ret, node, putobject, ID2SYM(mid));
         }
-	break;
+        break;
       }
       case NODE_ALIAS:{
-	ADD_INSN1(ret, node, putspecialobject, INT2FIX(VM_SPECIAL_OBJECT_VMCORE));
-	ADD_INSN1(ret, node, putspecialobject, INT2FIX(VM_SPECIAL_OBJECT_CBASE));
-	CHECK(COMPILE(ret, "alias arg1", node->nd_1st));
-	CHECK(COMPILE(ret, "alias arg2", node->nd_2nd));
-	ADD_SEND(ret, node, id_core_set_method_alias, INT2FIX(3));
-
-	if (popped) {
-	    ADD_INSN(ret, node, pop);
-	}
-	break;
+        ADD_INSN1(ret, node, putspecialobject, INT2FIX(VM_SPECIAL_OBJECT_VMCORE));
+        ADD_INSN1(ret, node, putspecialobject, INT2FIX(VM_SPECIAL_OBJECT_CBASE));
+        CHECK(COMPILE(ret, "alias arg1", RNODE_ALIAS(node)->nd_1st));
+        CHECK(COMPILE(ret, "alias arg2", RNODE_ALIAS(node)->nd_2nd));
+        ADD_SEND(ret, node, id_core_set_method_alias, INT2FIX(3));
+
+        if (popped) {
+            ADD_INSN(ret, node, pop);
+        }
+        break;
       }
       case NODE_VALIAS:{
-	ADD_INSN1(ret, node, putspecialobject, INT2FIX(VM_SPECIAL_OBJECT_VMCORE));
-	ADD_INSN1(ret, node, putobject, ID2SYM(node->nd_alias));
-	ADD_INSN1(ret, node, putobject, ID2SYM(node->nd_orig));
-	ADD_SEND(ret, node, id_core_set_variable_alias, INT2FIX(2));
-
-	if (popped) {
-	    ADD_INSN(ret, node, pop);
-	}
-	break;
+        ADD_INSN1(ret, node, putspecialobject, INT2FIX(VM_SPECIAL_OBJECT_VMCORE));
+        ADD_INSN1(ret, node, putobject, ID2SYM(RNODE_VALIAS(node)->nd_alias));
+        ADD_INSN1(ret, node, putobject, ID2SYM(RNODE_VALIAS(node)->nd_orig));
+        ADD_SEND(ret, node, id_core_set_variable_alias, INT2FIX(2));
+
+        if (popped) {
+            ADD_INSN(ret, node, pop);
+        }
+        break;
       }
       case NODE_UNDEF:{
-	ADD_INSN1(ret, node, putspecialobject, INT2FIX(VM_SPECIAL_OBJECT_VMCORE));
-	ADD_INSN1(ret, node, putspecialobject, INT2FIX(VM_SPECIAL_OBJECT_CBASE));
-	CHECK(COMPILE(ret, "undef arg", node->nd_undef));
-	ADD_SEND(ret, node, id_core_undef_method, INT2FIX(2));
-
-	if (popped) {
-	    ADD_INSN(ret, node, pop);
-	}
-	break;
+        const rb_parser_ary_t *ary = RNODE_UNDEF(node)->nd_undefs;
+
+        for (long i = 0; i < ary->len; i++) {
+            ADD_INSN1(ret, node, putspecialobject, INT2FIX(VM_SPECIAL_OBJECT_VMCORE));
+            ADD_INSN1(ret, node, putspecialobject, INT2FIX(VM_SPECIAL_OBJECT_CBASE));
+            CHECK(COMPILE(ret, "undef arg", ary->data[i]));
+            ADD_SEND(ret, node, id_core_undef_method, INT2FIX(2));
+
+            if (i < ary->len - 1) {
+                ADD_INSN(ret, node, pop);
+            }
+        }
+
+        if (popped) {
+            ADD_INSN(ret, node, pop);
+        }
+        break;
       }
       case NODE_CLASS:{
-	const rb_iseq_t *class_iseq = NEW_CHILD_ISEQ(node->nd_body,
-						     rb_str_freeze(rb_sprintf("<class:%"PRIsVALUE">", rb_id2str(node->nd_cpath->nd_mid))),
-						     ISEQ_TYPE_CLASS, line);
-	const int flags = VM_DEFINECLASS_TYPE_CLASS |
-	    (node->nd_super ? VM_DEFINECLASS_FLAG_HAS_SUPERCLASS : 0) |
-	    compile_cpath(ret, iseq, node->nd_cpath);
-
-	CHECK(COMPILE(ret, "super", node->nd_super));
-	ADD_INSN3(ret, node, defineclass, ID2SYM(node->nd_cpath->nd_mid), class_iseq, INT2FIX(flags));
+        const rb_iseq_t *class_iseq = NEW_CHILD_ISEQ(RNODE_CLASS(node)->nd_body,
+                                                     rb_str_freeze(rb_sprintf("<class:%"PRIsVALUE">", rb_id2str(get_node_colon_nd_mid(RNODE_CLASS(node)->nd_cpath)))),
+                                                     ISEQ_TYPE_CLASS, line);
+        const int flags = VM_DEFINECLASS_TYPE_CLASS |
+            (RNODE_CLASS(node)->nd_super ? VM_DEFINECLASS_FLAG_HAS_SUPERCLASS : 0) |
+            compile_cpath(ret, iseq, RNODE_CLASS(node)->nd_cpath);
+
+        CHECK(COMPILE(ret, "super", RNODE_CLASS(node)->nd_super));
+        ADD_INSN3(ret, node, defineclass, ID2SYM(get_node_colon_nd_mid(RNODE_CLASS(node)->nd_cpath)), class_iseq, INT2FIX(flags));
         RB_OBJ_WRITTEN(iseq, Qundef, (VALUE)class_iseq);
 
-	if (popped) {
-	    ADD_INSN(ret, node, pop);
-	}
-	break;
+        if (popped) {
+            ADD_INSN(ret, node, pop);
+        }
+        break;
       }
       case NODE_MODULE:{
-        const rb_iseq_t *module_iseq = NEW_CHILD_ISEQ(node->nd_body,
-						      rb_str_freeze(rb_sprintf("<module:%"PRIsVALUE">", rb_id2str(node->nd_cpath->nd_mid))),
-						      ISEQ_TYPE_CLASS, line);
-	const int flags = VM_DEFINECLASS_TYPE_MODULE |
-	    compile_cpath(ret, iseq, node->nd_cpath);
-
-	ADD_INSN (ret, node, putnil); /* dummy */
-	ADD_INSN3(ret, node, defineclass, ID2SYM(node->nd_cpath->nd_mid), module_iseq, INT2FIX(flags));
+        const rb_iseq_t *module_iseq = NEW_CHILD_ISEQ(RNODE_MODULE(node)->nd_body,
+                                                      rb_str_freeze(rb_sprintf("<module:%"PRIsVALUE">", rb_id2str(get_node_colon_nd_mid(RNODE_MODULE(node)->nd_cpath)))),
+                                                      ISEQ_TYPE_CLASS, line);
+        const int flags = VM_DEFINECLASS_TYPE_MODULE |
+            compile_cpath(ret, iseq, RNODE_MODULE(node)->nd_cpath);
+
+        ADD_INSN (ret, node, putnil); /* dummy */
+        ADD_INSN3(ret, node, defineclass, ID2SYM(get_node_colon_nd_mid(RNODE_MODULE(node)->nd_cpath)), module_iseq, INT2FIX(flags));
         RB_OBJ_WRITTEN(iseq, Qundef, (VALUE)module_iseq);
 
-	if (popped) {
-	    ADD_INSN(ret, node, pop);
-	}
-	break;
+        if (popped) {
+            ADD_INSN(ret, node, pop);
+        }
+        break;
       }
       case NODE_SCLASS:{
-	ID singletonclass;
-	const rb_iseq_t *singleton_class = NEW_ISEQ(node->nd_body, rb_fstring_lit("singleton class"),
-						    ISEQ_TYPE_CLASS, line);
-
-	CHECK(COMPILE(ret, "sclass#recv", node->nd_recv));
-	ADD_INSN (ret, node, putnil);
-	CONST_ID(singletonclass, "singletonclass");
-	ADD_INSN3(ret, node, defineclass,
-		  ID2SYM(singletonclass), singleton_class,
-		  INT2FIX(VM_DEFINECLASS_TYPE_SINGLETON_CLASS));
+        ID singletonclass;
+        const rb_iseq_t *singleton_class = NEW_ISEQ(RNODE_SCLASS(node)->nd_body, rb_fstring_lit("singleton class"),
+                                                    ISEQ_TYPE_CLASS, line);
+
+        CHECK(COMPILE(ret, "sclass#recv", RNODE_SCLASS(node)->nd_recv));
+        ADD_INSN (ret, node, putnil);
+        CONST_ID(singletonclass, "singletonclass");
+        ADD_INSN3(ret, node, defineclass,
+                  ID2SYM(singletonclass), singleton_class,
+                  INT2FIX(VM_DEFINECLASS_TYPE_SINGLETON_CLASS));
         RB_OBJ_WRITTEN(iseq, Qundef, (VALUE)singleton_class);
 
-	if (popped) {
-	    ADD_INSN(ret, node, pop);
-	}
-	break;
+        if (popped) {
+            ADD_INSN(ret, node, pop);
+        }
+        break;
       }
       case NODE_COLON2:
-	CHECK(compile_colon2(iseq, ret, node, popped));
-	break;
+        CHECK(compile_colon2(iseq, ret, node, popped));
+        break;
       case NODE_COLON3:
-	CHECK(compile_colon3(iseq, ret, node, popped));
-	break;
+        CHECK(compile_colon3(iseq, ret, node, popped));
+        break;
       case NODE_DOT2:
-	CHECK(compile_dots(iseq, ret, node, popped, FALSE));
-	break;
+        CHECK(compile_dots(iseq, ret, node, popped, FALSE));
+        break;
       case NODE_DOT3:
-	CHECK(compile_dots(iseq, ret, node, popped, TRUE));
-	break;
+        CHECK(compile_dots(iseq, ret, node, popped, TRUE));
+        break;
       case NODE_FLIP2:
       case NODE_FLIP3:{
-	LABEL *lend = NEW_LABEL(line);
-	LABEL *ltrue = NEW_LABEL(line);
-	LABEL *lfalse = NEW_LABEL(line);
-	CHECK(compile_flip_flop(iseq, ret, node, type == NODE_FLIP2,
-				ltrue, lfalse));
-	ADD_LABEL(ret, ltrue);
-	ADD_INSN1(ret, node, putobject, Qtrue);
-	ADD_INSNL(ret, node, jump, lend);
-	ADD_LABEL(ret, lfalse);
-	ADD_INSN1(ret, node, putobject, Qfalse);
-	ADD_LABEL(ret, lend);
-	break;
+        LABEL *lend = NEW_LABEL(line);
+        LABEL *ltrue = NEW_LABEL(line);
+        LABEL *lfalse = NEW_LABEL(line);
+        CHECK(compile_flip_flop(iseq, ret, node, type == NODE_FLIP2,
+                                ltrue, lfalse));
+        ADD_LABEL(ret, ltrue);
+        ADD_INSN1(ret, node, putobject, Qtrue);
+        ADD_INSNL(ret, node, jump, lend);
+        ADD_LABEL(ret, lfalse);
+        ADD_INSN1(ret, node, putobject, Qfalse);
+        ADD_LABEL(ret, lend);
+        break;
       }
       case NODE_SELF:{
-	if (!popped) {
-	    ADD_INSN(ret, node, putself);
-	}
-	break;
+        if (!popped) {
+            ADD_INSN(ret, node, putself);
+        }
+        break;
       }
       case NODE_NIL:{
-	if (!popped) {
-	    ADD_INSN(ret, node, putnil);
-	}
-	break;
+        if (!popped) {
+            ADD_INSN(ret, node, putnil);
+        }
+        break;
       }
       case NODE_TRUE:{
-	if (!popped) {
-	    ADD_INSN1(ret, node, putobject, Qtrue);
-	}
-	break;
+        if (!popped) {
+            ADD_INSN1(ret, node, putobject, Qtrue);
+        }
+        break;
       }
       case NODE_FALSE:{
-	if (!popped) {
-	    ADD_INSN1(ret, node, putobject, Qfalse);
-	}
-	break;
+        if (!popped) {
+            ADD_INSN1(ret, node, putobject, Qfalse);
+        }
+        break;
       }
       case NODE_ERRINFO:
-	CHECK(compile_errinfo(iseq, ret, node, popped));
-	break;
+        CHECK(compile_errinfo(iseq, ret, node, popped));
+        break;
       case NODE_DEFINED:
-	if (!popped) {
-	    CHECK(compile_defined_expr(iseq, ret, node, Qtrue));
-	}
-	break;
+        if (!popped) {
+            CHECK(compile_defined_expr(iseq, ret, node, Qtrue, false));
+        }
+        break;
       case NODE_POSTEXE:{
-	/* compiled to:
-	 *   ONCE{ rb_mRubyVMFrozenCore::core#set_postexe{ ... } }
-	 */
-	int is_index = body->is_size++;
+        /* compiled to:
+         *   ONCE{ rb_mRubyVMFrozenCore::core#set_postexe{ ... } }
+         */
+        int is_index = body->ise_size++;
         struct rb_iseq_new_with_callback_callback_func *ifunc =
-            rb_iseq_new_with_callback_new_callback(build_postexe_iseq, node->nd_body);
-	const rb_iseq_t *once_iseq =
-            new_child_iseq_with_callback(iseq, ifunc,
-				 rb_fstring(make_name_for_block(iseq)), iseq, ISEQ_TYPE_BLOCK, line);
+            rb_iseq_new_with_callback_new_callback(build_postexe_iseq, RNODE_POSTEXE(node)->nd_body);
+        const rb_iseq_t *once_iseq =
+            NEW_CHILD_ISEQ_WITH_CALLBACK(ifunc, rb_fstring(make_name_for_block(iseq)), ISEQ_TYPE_BLOCK, line);
 
-	ADD_INSN2(ret, node, once, once_iseq, INT2FIX(is_index));
+        ADD_INSN2(ret, node, once, once_iseq, INT2FIX(is_index));
         RB_OBJ_WRITTEN(iseq, Qundef, (VALUE)once_iseq);
 
-	if (popped) {
-	    ADD_INSN(ret, node, pop);
-	}
-	break;
+        if (popped) {
+            ADD_INSN(ret, node, pop);
+        }
+        break;
       }
       case NODE_KW_ARG:
-	CHECK(compile_kw_arg(iseq, ret, node, popped));
-	break;
+        CHECK(compile_kw_arg(iseq, ret, node, popped));
+        break;
       case NODE_DSYM:{
-	compile_dstr(iseq, ret, node);
-	if (!popped) {
-	    ADD_INSN(ret, node, intern);
-	}
-	else {
-	    ADD_INSN(ret, node, pop);
-	}
-	break;
+        compile_dstr(iseq, ret, node);
+        if (!popped) {
+            ADD_INSN(ret, node, intern);
+        }
+        else {
+            ADD_INSN(ret, node, pop);
+        }
+        break;
       }
       case NODE_ATTRASGN:
-	CHECK(compile_attrasgn(iseq, ret, node, popped));
-	break;
+        CHECK(compile_attrasgn(iseq, ret, node, popped));
+        break;
       case NODE_LAMBDA:{
-	/* compile same as lambda{...} */
-	const rb_iseq_t *block = NEW_CHILD_ISEQ(node->nd_body, make_name_for_block(iseq), ISEQ_TYPE_BLOCK, line);
-	VALUE argc = INT2FIX(0);
+        /* compile same as lambda{...} */
+        const rb_iseq_t *block = NEW_CHILD_ISEQ(RNODE_LAMBDA(node)->nd_body, make_name_for_block(iseq), ISEQ_TYPE_BLOCK, line);
+        VALUE argc = INT2FIX(0);
 
-	ADD_INSN1(ret, node, putspecialobject, INT2FIX(VM_SPECIAL_OBJECT_VMCORE));
-	ADD_CALL_WITH_BLOCK(ret, node, idLambda, argc, block);
+        ADD_INSN1(ret, node, putspecialobject, INT2FIX(VM_SPECIAL_OBJECT_VMCORE));
+        ADD_CALL_WITH_BLOCK(ret, node, idLambda, argc, block);
         RB_OBJ_WRITTEN(iseq, Qundef, (VALUE)block);
 
-	if (popped) {
-	    ADD_INSN(ret, node, pop);
-	}
-	break;
+        if (popped) {
+            ADD_INSN(ret, node, pop);
+        }
+        break;
       }
       default:
-	UNKNOWN_NODE("iseq_compile_each", node, COMPILE_NG);
+        UNKNOWN_NODE("iseq_compile_each", node, COMPILE_NG);
       ng:
-	debug_node_end();
-	return COMPILE_NG;
+        debug_node_end();
+        return COMPILE_NG;
     }
 
     debug_node_end();
@@ -9837,15 +11618,15 @@ opobj_inspect(VALUE obj)
 {
     if (!SPECIAL_CONST_P(obj) && !RBASIC_CLASS(obj)) {
         switch (BUILTIN_TYPE(obj)) {
-	  case T_STRING:
-	    obj = rb_str_new_cstr(RSTRING_PTR(obj));
-	    break;
-	  case T_ARRAY:
-	    obj = rb_ary_dup(obj);
-	    break;
+          case T_STRING:
+            obj = rb_str_new_cstr(RSTRING_PTR(obj));
+            break;
+          case T_ARRAY:
+            obj = rb_ary_dup(obj);
+            break;
           default:
             break;
-	}
+        }
     }
     return rb_inspect(obj);
 }
@@ -9858,86 +11639,92 @@ insn_data_to_s_detail(INSN *iobj)
     VALUE str = rb_sprintf("%-20s ", insn_name(iobj->insn_id));
 
     if (iobj->operands) {
-	const char *types = insn_op_types(iobj->insn_id);
-	int j;
-
-	for (j = 0; types[j]; j++) {
-	    char type = types[j];
-
-	    switch (type) {
-	      case TS_OFFSET:	/* label(destination position) */
-		{
-		    LABEL *lobj = (LABEL *)OPERAND_AT(iobj, j);
-		    rb_str_catf(str, LABEL_FORMAT, lobj->label_no);
-		    break;
-		}
-		break;
-	      case TS_ISEQ:	/* iseq */
-		{
-		    rb_iseq_t *iseq = (rb_iseq_t *)OPERAND_AT(iobj, j);
-		    VALUE val = Qnil;
-		    if (0 && iseq) { /* TODO: invalidate now */
-			val = (VALUE)iseq;
-		    }
-		    rb_str_concat(str, opobj_inspect(val));
-		}
-		break;
-	      case TS_LINDEX:
-	      case TS_NUM:	/* ulong */
-	      case TS_VALUE:	/* VALUE */
-		{
-		    VALUE v = OPERAND_AT(iobj, j);
+        const char *types = insn_op_types(iobj->insn_id);
+        int j;
+
+        for (j = 0; types[j]; j++) {
+            char type = types[j];
+
+            switch (type) {
+              case TS_OFFSET:	/* label(destination position) */
+                {
+                    LABEL *lobj = (LABEL *)OPERAND_AT(iobj, j);
+                    rb_str_catf(str, LABEL_FORMAT, lobj->label_no);
+                    break;
+                }
+                break;
+              case TS_ISEQ:	/* iseq */
+                {
+                    rb_iseq_t *iseq = (rb_iseq_t *)OPERAND_AT(iobj, j);
+                    VALUE val = Qnil;
+                    if (0 && iseq) { /* TODO: invalidate now */
+                        val = (VALUE)iseq;
+                    }
+                    rb_str_concat(str, opobj_inspect(val));
+                }
+                break;
+              case TS_LINDEX:
+              case TS_NUM:	/* ulong */
+              case TS_VALUE:	/* VALUE */
+                {
+                    VALUE v = OPERAND_AT(iobj, j);
                     if (!CLASS_OF(v))
                         rb_str_cat2(str, "<hidden>");
                     else {
                         rb_str_concat(str, opobj_inspect(v));
                     }
-		    break;
-		}
-	      case TS_ID:	/* ID */
-		rb_str_concat(str, opobj_inspect(OPERAND_AT(iobj, j)));
-		break;
-	      case TS_IC:	/* inline cache */
-	      case TS_IVC:	/* inline ivar cache */
-	      case TS_ICVARC:   /* inline cvar cache */
-	      case TS_ISE:	/* inline storage entry */
-		rb_str_catf(str, "<ic:%d>", FIX2INT(OPERAND_AT(iobj, j)));
-		break;
+                    break;
+                }
+              case TS_ID:	/* ID */
+                rb_str_concat(str, opobj_inspect(OPERAND_AT(iobj, j)));
+                break;
+              case TS_IC:	/* inline cache */
+                rb_str_concat(str, opobj_inspect(OPERAND_AT(iobj, j)));
+                break;
+              case TS_IVC:	/* inline ivar cache */
+                rb_str_catf(str, "<ivc:%d>", FIX2INT(OPERAND_AT(iobj, j)));
+                break;
+              case TS_ICVARC:   /* inline cvar cache */
+                rb_str_catf(str, "<icvarc:%d>", FIX2INT(OPERAND_AT(iobj, j)));
+                break;
+              case TS_ISE:	/* inline storage entry */
+                rb_str_catf(str, "<ise:%d>", FIX2INT(OPERAND_AT(iobj, j)));
+                break;
               case TS_CALLDATA: /* we store these as call infos at compile time */
-		{
+                {
                     const struct rb_callinfo *ci = (struct rb_callinfo *)OPERAND_AT(iobj, j);
                     rb_str_cat2(str, "<calldata:");
                     if (vm_ci_mid(ci)) rb_str_catf(str, "%"PRIsVALUE, rb_id2str(vm_ci_mid(ci)));
                     rb_str_catf(str, ", %d>", vm_ci_argc(ci));
-		    break;
-		}
-	      case TS_CDHASH:	/* case/when condition cache */
-		rb_str_cat2(str, "<ch>");
-		break;
-	      case TS_FUNCPTR:
-		{
-		    void *func = (void *)OPERAND_AT(iobj, j);
+                    break;
+                }
+              case TS_CDHASH:	/* case/when condition cache */
+                rb_str_cat2(str, "<ch>");
+                break;
+              case TS_FUNCPTR:
+                {
+                    void *func = (void *)OPERAND_AT(iobj, j);
 #ifdef HAVE_DLADDR
-		    Dl_info info;
-		    if (dladdr(func, &info) && info.dli_sname) {
-			rb_str_cat2(str, info.dli_sname);
-			break;
-		    }
+                    Dl_info info;
+                    if (dladdr(func, &info) && info.dli_sname) {
+                        rb_str_cat2(str, info.dli_sname);
+                        break;
+                    }
 #endif
-		    rb_str_catf(str, "<%p>", func);
-		}
-		break;
+                    rb_str_catf(str, "<%p>", func);
+                }
+                break;
               case TS_BUILTIN:
                 rb_str_cat2(str, "<TS_BUILTIN>");
                 break;
-	      default:{
-		rb_raise(rb_eSyntaxError, "unknown operand type: %c", type);
-	      }
-	    }
-	    if (types[j + 1]) {
-		rb_str_cat2(str, ", ");
-	    }
-	}
+              default:{
+                rb_raise(rb_eSyntaxError, "unknown operand type: %c", type);
+              }
+            }
+            if (types[j + 1]) {
+                rb_str_cat2(str, ", ");
+            }
+        }
     }
     return str;
 }
@@ -9959,45 +11746,51 @@ dump_disasm_list_with_cursor(const LINK_ELEMENT *link, const LINK_ELEMENT *curr,
     printf("-- raw disasm--------\n");
 
     while (link) {
-	if (curr) printf(curr == link ? "*" : " ");
-	switch (link->type) {
-	  case ISEQ_ELEMENT_INSN:
-	    {
-		iobj = (INSN *)link;
-		str = insn_data_to_s_detail(iobj);
-		printf("  %04d %-65s(%4u)\n", pos, StringValueCStr(str), iobj->insn_info.line_no);
-		pos += insn_data_length(iobj);
-		break;
-	    }
-	  case ISEQ_ELEMENT_LABEL:
-	    {
-		lobj = (LABEL *)link;
-		printf(LABEL_FORMAT" [sp: %d]%s\n", lobj->label_no, lobj->sp,
-		       dest == lobj ? " <---" : "");
-		break;
-	    }
-	  case ISEQ_ELEMENT_TRACE:
-	    {
-		TRACE *trace = (TRACE *)link;
-		printf("  trace: %0x\n", trace->event);
-		break;
-	    }
-	  case ISEQ_ELEMENT_ADJUST:
-	    {
-		ADJUST *adjust = (ADJUST *)link;
-		printf("  adjust: [label: %d]\n", adjust->label ? adjust->label->label_no : -1);
-		break;
-	    }
-	  default:
-	    /* ignore */
-	    rb_raise(rb_eSyntaxError, "dump_disasm_list error: %ld\n", FIX2LONG(link->type));
-	}
-	link = link->next;
+        if (curr) printf(curr == link ? "*" : " ");
+        switch (link->type) {
+          case ISEQ_ELEMENT_INSN:
+            {
+                iobj = (INSN *)link;
+                str = insn_data_to_s_detail(iobj);
+                printf("  %04d %-65s(%4u)\n", pos, StringValueCStr(str), iobj->insn_info.line_no);
+                pos += insn_data_length(iobj);
+                break;
+            }
+          case ISEQ_ELEMENT_LABEL:
+            {
+                lobj = (LABEL *)link;
+                printf(LABEL_FORMAT" [sp: %d, unremovable: %d, refcnt: %d]%s\n", lobj->label_no, lobj->sp, lobj->unremovable, lobj->refcnt,
+                       dest == lobj ? " <---" : "");
+                break;
+            }
+          case ISEQ_ELEMENT_TRACE:
+            {
+                TRACE *trace = (TRACE *)link;
+                printf("  trace: %0x\n", trace->event);
+                break;
+            }
+          case ISEQ_ELEMENT_ADJUST:
+            {
+                ADJUST *adjust = (ADJUST *)link;
+                printf("  adjust: [label: %d]\n", adjust->label ? adjust->label->label_no : -1);
+                break;
+            }
+          default:
+            /* ignore */
+            rb_raise(rb_eSyntaxError, "dump_disasm_list error: %d\n", (int)link->type);
+        }
+        link = link->next;
     }
     printf("---------------------\n");
     fflush(stdout);
 }
 
+int
+rb_insn_len(VALUE insn)
+{
+    return insn_len(insn);
+}
+
 const char *
 rb_insns_name(int i)
 {
@@ -10010,9 +11803,9 @@ rb_insns_name_array(void)
     VALUE ary = rb_ary_new_capa(VM_INSTRUCTION_SIZE);
     int i;
     for (i = 0; i < VM_INSTRUCTION_SIZE; i++) {
-	rb_ary_push(ary, rb_fstring_cstr(insn_name(i)));
+        rb_ary_push(ary, rb_fstring_cstr(insn_name(i)));
     }
-    return rb_obj_freeze(ary);
+    return rb_ary_freeze(ary);
 }
 
 static LABEL *
@@ -10023,11 +11816,11 @@ register_label(rb_iseq_t *iseq, struct st_table *labels_table, VALUE obj)
     obj = rb_to_symbol_type(obj);
 
     if (st_lookup(labels_table, obj, &tmp) == 0) {
-	label = NEW_LABEL(0);
-	st_insert(labels_table, obj, (st_data_t)label);
+        label = NEW_LABEL(0);
+        st_insert(labels_table, obj, (st_data_t)label);
     }
     else {
-	label = (LABEL *)tmp;
+        label = (LABEL *)tmp;
     }
     LABEL_REF(label);
     return label;
@@ -10040,12 +11833,12 @@ get_exception_sym2type(VALUE sym)
     static VALUE symBreak, symRedo, symNext;
 
     if (symRescue == 0) {
-	symRescue = ID2SYM(rb_intern_const("rescue"));
-	symEnsure = ID2SYM(rb_intern_const("ensure"));
-	symRetry  = ID2SYM(rb_intern_const("retry"));
-	symBreak  = ID2SYM(rb_intern_const("break"));
-	symRedo   = ID2SYM(rb_intern_const("redo"));
-	symNext   = ID2SYM(rb_intern_const("next"));
+        symRescue = ID2SYM(rb_intern_const("rescue"));
+        symEnsure = ID2SYM(rb_intern_const("ensure"));
+        symRetry  = ID2SYM(rb_intern_const("retry"));
+        symBreak  = ID2SYM(rb_intern_const("break"));
+        symRedo   = ID2SYM(rb_intern_const("redo"));
+        symNext   = ID2SYM(rb_intern_const("next"));
     }
 
     if (sym == symRescue) return CATCH_TYPE_RESCUE;
@@ -10060,25 +11853,25 @@ get_exception_sym2type(VALUE sym)
 
 static int
 iseq_build_from_ary_exception(rb_iseq_t *iseq, struct st_table *labels_table,
-		     VALUE exception)
+                     VALUE exception)
 {
     int i;
 
     for (i=0; i<RARRAY_LEN(exception); i++) {
-	const rb_iseq_t *eiseq;
-	VALUE v, type;
-	LABEL *lstart, *lend, *lcont;
-	unsigned int sp;
-
-	v = rb_to_array_type(RARRAY_AREF(exception, i));
-	if (RARRAY_LEN(v) != 6) {
-	    rb_raise(rb_eSyntaxError, "wrong exception entry");
-	}
+        const rb_iseq_t *eiseq;
+        VALUE v, type;
+        LABEL *lstart, *lend, *lcont;
+        unsigned int sp;
+
+        v = rb_to_array_type(RARRAY_AREF(exception, i));
+        if (RARRAY_LEN(v) != 6) {
+            rb_raise(rb_eSyntaxError, "wrong exception entry");
+        }
         type = get_exception_sym2type(RARRAY_AREF(v, 0));
         if (NIL_P(RARRAY_AREF(v, 1))) {
-	    eiseq = NULL;
-	}
-	else {
+            eiseq = NULL;
+        }
+        else {
             eiseq = rb_iseqw_to_iseq(rb_iseq_load(RARRAY_AREF(v, 1), (VALUE)iseq, Qnil));
         }
 
@@ -10087,18 +11880,18 @@ iseq_build_from_ary_exception(rb_iseq_t *iseq, struct st_table *labels_table,
         lcont  = register_label(iseq, labels_table, RARRAY_AREF(v, 4));
         sp     = NUM2UINT(RARRAY_AREF(v, 5));
 
-	/* TODO: Dirty Hack!  Fix me */
-	if (type == CATCH_TYPE_RESCUE ||
-	    type == CATCH_TYPE_BREAK ||
-	    type == CATCH_TYPE_NEXT) {
-	    ++sp;
-	}
+        /* TODO: Dirty Hack!  Fix me */
+        if (type == CATCH_TYPE_RESCUE ||
+            type == CATCH_TYPE_BREAK ||
+            type == CATCH_TYPE_NEXT) {
+            ++sp;
+        }
 
-	lcont->sp = sp;
+        lcont->sp = sp;
 
-	ADD_CATCH_ENTRY(type, lstart, lend, eiseq, lcont);
+        ADD_CATCH_ENTRY(type, lstart, lend, eiseq, lcont);
 
-	RB_GC_GUARD(v);
+        RB_GC_GUARD(v);
     }
     return COMPILE_OK;
 }
@@ -10111,7 +11904,7 @@ insn_make_insn_table(void)
     table = st_init_numtable_with_size(VM_INSTRUCTION_SIZE);
 
     for (i=0; i<VM_INSTRUCTION_SIZE; i++) {
-	st_insert(table, ID2SYM(rb_intern_const(insn_name(i))), i);
+        st_insert(table, ID2SYM(rb_intern_const(insn_name(i))), i);
     }
 
     return table;
@@ -10124,13 +11917,13 @@ iseq_build_load_iseq(const rb_iseq_t *iseq, VALUE op)
     const rb_iseq_t *loaded_iseq;
 
     if (RB_TYPE_P(op, T_ARRAY)) {
-	iseqw = rb_iseq_load(op, (VALUE)iseq, Qnil);
+        iseqw = rb_iseq_load(op, (VALUE)iseq, Qnil);
     }
     else if (CLASS_OF(op) == rb_cISeq) {
-	iseqw = op;
+        iseqw = op;
     }
     else {
-	rb_raise(rb_eSyntaxError, "ISEQ is required");
+        rb_raise(rb_eSyntaxError, "ISEQ is required");
     }
 
     loaded_iseq = rb_iseqw_to_iseq(iseqw);
@@ -10146,28 +11939,29 @@ iseq_build_callinfo_from_hash(rb_iseq_t *iseq, VALUE op)
     struct rb_callinfo_kwarg *kw_arg = 0;
 
     if (!NIL_P(op)) {
-	VALUE vmid = rb_hash_aref(op, ID2SYM(rb_intern_const("mid")));
-	VALUE vflag = rb_hash_aref(op, ID2SYM(rb_intern_const("flag")));
-	VALUE vorig_argc = rb_hash_aref(op, ID2SYM(rb_intern_const("orig_argc")));
-	VALUE vkw_arg = rb_hash_aref(op, ID2SYM(rb_intern_const("kw_arg")));
-
-	if (!NIL_P(vmid)) mid = SYM2ID(vmid);
-	if (!NIL_P(vflag)) flag = NUM2UINT(vflag);
-	if (!NIL_P(vorig_argc)) orig_argc = FIX2INT(vorig_argc);
-
-	if (!NIL_P(vkw_arg)) {
-	    int i;
-	    int len = RARRAY_LENINT(vkw_arg);
-	    size_t n = rb_callinfo_kwarg_bytes(len);
-
-	    kw_arg = xmalloc(n);
-	    kw_arg->keyword_len = len;
-	    for (i = 0; i < len; i++) {
-		VALUE kw = RARRAY_AREF(vkw_arg, i);
-		SYM2ID(kw);	/* make immortal */
-		kw_arg->keywords[i] = kw;
-	    }
-	}
+        VALUE vmid = rb_hash_aref(op, ID2SYM(rb_intern_const("mid")));
+        VALUE vflag = rb_hash_aref(op, ID2SYM(rb_intern_const("flag")));
+        VALUE vorig_argc = rb_hash_aref(op, ID2SYM(rb_intern_const("orig_argc")));
+        VALUE vkw_arg = rb_hash_aref(op, ID2SYM(rb_intern_const("kw_arg")));
+
+        if (!NIL_P(vmid)) mid = SYM2ID(vmid);
+        if (!NIL_P(vflag)) flag = NUM2UINT(vflag);
+        if (!NIL_P(vorig_argc)) orig_argc = FIX2INT(vorig_argc);
+
+        if (!NIL_P(vkw_arg)) {
+            int i;
+            int len = RARRAY_LENINT(vkw_arg);
+            size_t n = rb_callinfo_kwarg_bytes(len);
+
+            kw_arg = xmalloc(n);
+            kw_arg->references = 0;
+            kw_arg->keyword_len = len;
+            for (i = 0; i < len; i++) {
+                VALUE kw = RARRAY_AREF(vkw_arg, i);
+                SYM2ID(kw);	/* make immortal */
+                kw_arg->keywords[i] = kw;
+            }
+        }
     }
 
     const struct rb_callinfo *ci = new_callinfo(iseq, mid, orig_argc, flag, kw_arg, (flag & VM_CALL_ARGS_SIMPLE) == 0);
@@ -10179,24 +11973,25 @@ static rb_event_flag_t
 event_name_to_flag(VALUE sym)
 {
 #define CHECK_EVENT(ev) if (sym == ID2SYM(rb_intern_const(#ev))) return ev;
-		CHECK_EVENT(RUBY_EVENT_LINE);
-		CHECK_EVENT(RUBY_EVENT_CLASS);
-		CHECK_EVENT(RUBY_EVENT_END);
-		CHECK_EVENT(RUBY_EVENT_CALL);
-		CHECK_EVENT(RUBY_EVENT_RETURN);
-		CHECK_EVENT(RUBY_EVENT_B_CALL);
-		CHECK_EVENT(RUBY_EVENT_B_RETURN);
+                CHECK_EVENT(RUBY_EVENT_LINE);
+                CHECK_EVENT(RUBY_EVENT_CLASS);
+                CHECK_EVENT(RUBY_EVENT_END);
+                CHECK_EVENT(RUBY_EVENT_CALL);
+                CHECK_EVENT(RUBY_EVENT_RETURN);
+                CHECK_EVENT(RUBY_EVENT_B_CALL);
+                CHECK_EVENT(RUBY_EVENT_B_RETURN);
+                CHECK_EVENT(RUBY_EVENT_RESCUE);
 #undef CHECK_EVENT
     return RUBY_EVENT_NONE;
 }
 
 static int
 iseq_build_from_ary_body(rb_iseq_t *iseq, LINK_ANCHOR *const anchor,
-			 VALUE body, VALUE node_ids, VALUE labels_wrapper)
+                         VALUE body, VALUE node_ids, VALUE labels_wrapper)
 {
     /* TODO: body should be frozen */
     long i, len = RARRAY_LEN(body);
-    struct st_table *labels_table = DATA_PTR(labels_wrapper);
+    struct st_table *labels_table = RTYPEDDATA_DATA(labels_wrapper);
     int j;
     int line_no = 0, node_id = -1, insn_idx = 0;
     int ret = COMPILE_OK;
@@ -10207,151 +12002,176 @@ iseq_build_from_ary_body(rb_iseq_t *iseq, LINK_ANCHOR *const anchor,
     static struct st_table *insn_table;
 
     if (insn_table == 0) {
-	insn_table = insn_make_insn_table();
+        insn_table = insn_make_insn_table();
     }
 
     for (i=0; i<len; i++) {
         VALUE obj = RARRAY_AREF(body, i);
 
-	if (SYMBOL_P(obj)) {
-	    rb_event_flag_t event;
-	    if ((event = event_name_to_flag(obj)) != RUBY_EVENT_NONE) {
-		ADD_TRACE(anchor, event);
-	    }
-	    else {
-		LABEL *label = register_label(iseq, labels_table, obj);
-		ADD_LABEL(anchor, label);
-	    }
-	}
-	else if (FIXNUM_P(obj)) {
-	    line_no = NUM2INT(obj);
-	}
-	else if (RB_TYPE_P(obj, T_ARRAY)) {
-	    VALUE *argv = 0;
-	    int argc = RARRAY_LENINT(obj) - 1;
-	    st_data_t insn_id;
-	    VALUE insn;
+        if (SYMBOL_P(obj)) {
+            rb_event_flag_t event;
+            if ((event = event_name_to_flag(obj)) != RUBY_EVENT_NONE) {
+                ADD_TRACE(anchor, event);
+            }
+            else {
+                LABEL *label = register_label(iseq, labels_table, obj);
+                ADD_LABEL(anchor, label);
+            }
+        }
+        else if (FIXNUM_P(obj)) {
+            line_no = NUM2INT(obj);
+        }
+        else if (RB_TYPE_P(obj, T_ARRAY)) {
+            VALUE *argv = 0;
+            int argc = RARRAY_LENINT(obj) - 1;
+            st_data_t insn_id;
+            VALUE insn;
 
             if (node_ids) {
                 node_id = NUM2INT(rb_ary_entry(node_ids, insn_idx++));
             }
 
-	    insn = (argc < 0) ? Qnil : RARRAY_AREF(obj, 0);
-	    if (st_lookup(insn_table, (st_data_t)insn, &insn_id) == 0) {
-		/* TODO: exception */
-		COMPILE_ERROR(iseq, line_no,
-			      "unknown instruction: %+"PRIsVALUE, insn);
-		ret = COMPILE_NG;
-		break;
-	    }
+            insn = (argc < 0) ? Qnil : RARRAY_AREF(obj, 0);
+            if (st_lookup(insn_table, (st_data_t)insn, &insn_id) == 0) {
+                /* TODO: exception */
+                COMPILE_ERROR(iseq, line_no,
+                              "unknown instruction: %+"PRIsVALUE, insn);
+                ret = COMPILE_NG;
+                break;
+            }
 
-	    if (argc != insn_len((VALUE)insn_id)-1) {
-		COMPILE_ERROR(iseq, line_no,
-			      "operand size mismatch");
-		ret = COMPILE_NG;
-		break;
-	    }
+            if (argc != insn_len((VALUE)insn_id)-1) {
+                COMPILE_ERROR(iseq, line_no,
+                              "operand size mismatch");
+                ret = COMPILE_NG;
+                break;
+            }
 
-	    if (argc > 0) {
+            if (argc > 0) {
                 argv = compile_data_calloc2(iseq, sizeof(VALUE), argc);
 
                 // add element before operand setup to make GC root
-                NODE dummy_line_node = generate_dummy_line_node(line_no, node_id);
                 ADD_ELEM(anchor,
-                         (LINK_ELEMENT*)new_insn_core(iseq, &dummy_line_node,
+                         (LINK_ELEMENT*)new_insn_core(iseq, line_no, node_id,
                                                       (enum ruby_vminsn_type)insn_id, argc, argv));
 
-		for (j=0; j<argc; j++) {
-		    VALUE op = rb_ary_entry(obj, j+1);
-		    switch (insn_op_type((VALUE)insn_id, j)) {
-		      case TS_OFFSET: {
-			LABEL *label = register_label(iseq, labels_table, op);
-			argv[j] = (VALUE)label;
-			break;
-		      }
-		      case TS_LINDEX:
-		      case TS_NUM:
-			(void)NUM2INT(op);
-			argv[j] = op;
-			break;
-		      case TS_VALUE:
-			argv[j] = op;
-			RB_OBJ_WRITTEN(iseq, Qundef, op);
-			break;
-		      case TS_ISEQ:
-			{
-			    if (op != Qnil) {
-				VALUE v = (VALUE)iseq_build_load_iseq(iseq, op);
-				argv[j] = v;
-				RB_OBJ_WRITTEN(iseq, Qundef, v);
-			    }
-			    else {
-				argv[j] = 0;
-			    }
-			}
-			break;
-		      case TS_ISE:
-		      case TS_IC:
+                for (j=0; j<argc; j++) {
+                    VALUE op = rb_ary_entry(obj, j+1);
+                    switch (insn_op_type((VALUE)insn_id, j)) {
+                      case TS_OFFSET: {
+                        LABEL *label = register_label(iseq, labels_table, op);
+                        argv[j] = (VALUE)label;
+                        break;
+                      }
+                      case TS_LINDEX:
+                      case TS_NUM:
+                        (void)NUM2INT(op);
+                        argv[j] = op;
+                        break;
+                      case TS_VALUE:
+                        argv[j] = op;
+                        RB_OBJ_WRITTEN(iseq, Qundef, op);
+                        break;
+                      case TS_ISEQ:
+                        {
+                            if (op != Qnil) {
+                                VALUE v = (VALUE)iseq_build_load_iseq(iseq, op);
+                                argv[j] = v;
+                                RB_OBJ_WRITTEN(iseq, Qundef, v);
+                            }
+                            else {
+                                argv[j] = 0;
+                            }
+                        }
+                        break;
+                      case TS_ISE:
+                        argv[j] = op;
+                        if (NUM2UINT(op) >= ISEQ_BODY(iseq)->ise_size) {
+                            ISEQ_BODY(iseq)->ise_size = NUM2INT(op) + 1;
+                        }
+                        break;
+                      case TS_IC:
+                        {
+                            VALUE segments = rb_ary_new();
+                            op = rb_to_array_type(op);
+
+                            for (int i = 0; i < RARRAY_LEN(op); i++) {
+                                VALUE sym = RARRAY_AREF(op, i);
+                                sym = rb_to_symbol_type(sym);
+                                rb_ary_push(segments, sym);
+                            }
+
+                            RB_GC_GUARD(op);
+                            argv[j] = segments;
+                            RB_OBJ_WRITTEN(iseq, Qundef, segments);
+                            ISEQ_BODY(iseq)->ic_size++;
+                        }
+                        break;
                       case TS_IVC:  /* inline ivar cache */
+                        argv[j] = op;
+                        if (NUM2UINT(op) >= ISEQ_BODY(iseq)->ivc_size) {
+                            ISEQ_BODY(iseq)->ivc_size = NUM2INT(op) + 1;
+                        }
+                        break;
                       case TS_ICVARC:  /* inline cvar cache */
-			argv[j] = op;
-                        if (NUM2UINT(op) >= ISEQ_BODY(iseq)->is_size) {
-                            ISEQ_BODY(iseq)->is_size = NUM2INT(op) + 1;
+                        argv[j] = op;
+                        if (NUM2UINT(op) >= ISEQ_BODY(iseq)->icvarc_size) {
+                            ISEQ_BODY(iseq)->icvarc_size = NUM2INT(op) + 1;
                         }
-                        FL_SET((VALUE)iseq, ISEQ_MARKABLE_ISEQ);
-			break;
+                        break;
                       case TS_CALLDATA:
-			argv[j] = iseq_build_callinfo_from_hash(iseq, op);
-			break;
-		      case TS_ID:
-			argv[j] = rb_to_symbol_type(op);
-			break;
-		      case TS_CDHASH:
-			{
-			    int i;
-			    VALUE map = rb_hash_new_with_size(RARRAY_LEN(op)/2);
+                        argv[j] = iseq_build_callinfo_from_hash(iseq, op);
+                        break;
+                      case TS_ID:
+                        argv[j] = rb_to_symbol_type(op);
+                        break;
+                      case TS_CDHASH:
+                        {
+                            int i;
+                            VALUE map = rb_hash_new_with_size(RARRAY_LEN(op)/2);
 
                             RHASH_TBL_RAW(map)->type = &cdhash_type;
-			    op = rb_to_array_type(op);
-			    for (i=0; i<RARRAY_LEN(op); i+=2) {
-				VALUE key = RARRAY_AREF(op, i);
-				VALUE sym = RARRAY_AREF(op, i+1);
-				LABEL *label =
-				  register_label(iseq, labels_table, sym);
-				rb_hash_aset(map, key, (VALUE)label | 1);
-			    }
-			    RB_GC_GUARD(op);
-			    argv[j] = map;
-			    RB_OBJ_WRITTEN(iseq, Qundef, map);
-			}
-			break;
-		      case TS_FUNCPTR:
-			{
+                            op = rb_to_array_type(op);
+                            for (i=0; i<RARRAY_LEN(op); i+=2) {
+                                VALUE key = RARRAY_AREF(op, i);
+                                VALUE sym = RARRAY_AREF(op, i+1);
+                                LABEL *label =
+                                  register_label(iseq, labels_table, sym);
+                                rb_hash_aset(map, key, (VALUE)label | 1);
+                            }
+                            RB_GC_GUARD(op);
+                            RB_OBJ_SET_SHAREABLE(rb_obj_hide(map)); // allow mutation while compiling
+                            argv[j] = map;
+                            RB_OBJ_WRITTEN(iseq, Qundef, map);
+                        }
+                        break;
+                      case TS_FUNCPTR:
+                        {
 #if SIZEOF_VALUE <= SIZEOF_LONG
-			    long funcptr = NUM2LONG(op);
+                            long funcptr = NUM2LONG(op);
 #else
-			    LONG_LONG funcptr = NUM2LL(op);
+                            LONG_LONG funcptr = NUM2LL(op);
 #endif
-			    argv[j] = (VALUE)funcptr;
-			}
-			break;
-		      default:
-			rb_raise(rb_eSyntaxError, "unknown operand: %c", insn_op_type((VALUE)insn_id, j));
-		    }
-		}
-	    }
+                            argv[j] = (VALUE)funcptr;
+                        }
+                        break;
+                      default:
+                        rb_raise(rb_eSyntaxError, "unknown operand: %c", insn_op_type((VALUE)insn_id, j));
+                    }
+                }
+            }
             else {
-                NODE dummy_line_node = generate_dummy_line_node(line_no, node_id);
                 ADD_ELEM(anchor,
-                         (LINK_ELEMENT*)new_insn_core(iseq, &dummy_line_node,
+                         (LINK_ELEMENT*)new_insn_core(iseq, line_no, node_id,
                                                       (enum ruby_vminsn_type)insn_id, argc, NULL));
             }
-	}
-	else {
-	    rb_raise(rb_eTypeError, "unexpected object for instruction");
-	}
+        }
+        else {
+            rb_raise(rb_eTypeError, "unexpected object for instruction");
+        }
     }
-    DATA_PTR(labels_wrapper) = 0;
+    RTYPEDDATA_DATA(labels_wrapper) = 0;
+    RB_GC_GUARD(labels_wrapper);
     validate_labels(iseq, labels_table);
     if (!ret) return ret;
     return iseq_setup(iseq, anchor);
@@ -10365,12 +12185,12 @@ int_param(int *dst, VALUE param, VALUE sym)
 {
     VALUE val = rb_hash_aref(param, sym);
     if (FIXNUM_P(val)) {
-	*dst = FIX2INT(val);
-	return TRUE;
+        *dst = FIX2INT(val);
+        return TRUE;
     }
     else if (!NIL_P(val)) {
-	rb_raise(rb_eTypeError, "invalid %+"PRIsVALUE" Fixnum: %+"PRIsVALUE,
-		 sym, val);
+        rb_raise(rb_eTypeError, "invalid %+"PRIsVALUE" Fixnum: %+"PRIsVALUE,
+                 sym, val);
     }
     return FALSE;
 }
@@ -10397,20 +12217,20 @@ iseq_build_kw(rb_iseq_t *iseq, VALUE params, VALUE keywords)
 
     /* required args */
     for (i = 0; i < len; i++) {
-	VALUE val = RARRAY_AREF(keywords, i);
+        VALUE val = RARRAY_AREF(keywords, i);
 
-	if (!SYMBOL_P(val)) {
-	    goto default_values;
-	}
-	ids[i] = SYM2ID(val);
-	keyword->required_num++;
+        if (!SYMBOL_P(val)) {
+            goto default_values;
+        }
+        ids[i] = SYM2ID(val);
+        keyword->required_num++;
     }
 
   default_values: /* note: we intentionally preserve `i' from previous loop */
     default_len = len - i;
     if (default_len == 0) {
-	keyword->table = ids;
-	return keyword;
+        keyword->table = ids;
+        return keyword;
     }
     else if (default_len < 0) {
         UNREACHABLE;
@@ -10419,23 +12239,23 @@ iseq_build_kw(rb_iseq_t *iseq, VALUE params, VALUE keywords)
     dvs = ALLOC_N(VALUE, (unsigned int)default_len);
 
     for (j = 0; i < len; i++, j++) {
-	key = RARRAY_AREF(keywords, i);
-	CHECK_ARRAY(key);
-
-	switch (RARRAY_LEN(key)) {
-	  case 1:
-	    sym = RARRAY_AREF(key, 0);
-	    default_val = Qundef;
-	    break;
-	  case 2:
-	    sym = RARRAY_AREF(key, 0);
-	    default_val = RARRAY_AREF(key, 1);
-	    break;
-	  default:
-	    rb_raise(rb_eTypeError, "keyword default has unsupported len %+"PRIsVALUE, key);
-	}
-	ids[i] = SYM2ID(sym);
-	dvs[j] = default_val;
+        key = RARRAY_AREF(keywords, i);
+        CHECK_ARRAY(key);
+
+        switch (RARRAY_LEN(key)) {
+          case 1:
+            sym = RARRAY_AREF(key, 0);
+            default_val = Qundef;
+            break;
+          case 2:
+            sym = RARRAY_AREF(key, 0);
+            default_val = RARRAY_AREF(key, 1);
+            break;
+          default:
+            rb_raise(rb_eTypeError, "keyword default has unsupported len %+"PRIsVALUE, key);
+        }
+        ids[i] = SYM2ID(sym);
+        RB_OBJ_WRITE(iseq, &dvs[j], default_val);
     }
 
     keyword->table = ids;
@@ -10444,8 +12264,14 @@ iseq_build_kw(rb_iseq_t *iseq, VALUE params, VALUE keywords)
     return keyword;
 }
 
+static void
+iseq_insn_each_object_mark_and_move(VALUE * obj, VALUE _)
+{
+    rb_gc_mark_and_move(obj);
+}
+
 void
-rb_iseq_mark_insn_storage(struct iseq_compile_data_storage *storage)
+rb_iseq_mark_and_move_insn_storage(struct iseq_compile_data_storage *storage)
 {
     INSN *iobj = 0;
     size_t size = sizeof(INSN);
@@ -10470,44 +12296,32 @@ rb_iseq_mark_insn_storage(struct iseq_compile_data_storage *storage)
             iobj = (INSN *)&storage->buff[pos];
 
             if (iobj->operands) {
-                int j;
-                const char *types = insn_op_types(iobj->insn_id);
-
-                for (j = 0; types[j]; j++) {
-                    char type = types[j];
-                    switch (type) {
-                      case TS_CDHASH:
-                      case TS_ISEQ:
-                      case TS_VALUE:
-                      case TS_CALLDATA: // ci is stored.
-                        {
-                            VALUE op = OPERAND_AT(iobj, j);
-
-                            if (!SPECIAL_CONST_P(op)) {
-                                rb_gc_mark(op);
-                            }
-                        }
-                        break;
-                      default:
-                        break;
-                    }
-                }
+                iseq_insn_each_markable_object(iobj, iseq_insn_each_object_mark_and_move, (VALUE)0);
             }
             pos += (int)size;
         }
     }
 }
 
+static const rb_data_type_t labels_wrapper_type = {
+    .wrap_struct_name = "compiler/labels_wrapper",
+    .function = {
+        .dmark = (RUBY_DATA_FUNC)rb_mark_set,
+        .dfree = (RUBY_DATA_FUNC)st_free_table,
+    },
+    .flags = RUBY_TYPED_FREE_IMMEDIATELY | RUBY_TYPED_WB_PROTECTED,
+};
+
 void
 rb_iseq_build_from_ary(rb_iseq_t *iseq, VALUE misc, VALUE locals, VALUE params,
-			 VALUE exception, VALUE body)
+                         VALUE exception, VALUE body)
 {
 #define SYM(s) ID2SYM(rb_intern_const(#s))
     int i, len;
     unsigned int arg_size, local_size, stack_max;
     ID *tbl;
     struct st_table *labels_table = st_init_numtable();
-    VALUE labels_wrapper = Data_Wrap_Struct(0, rb_mark_set, st_free_table, labels_table);
+    VALUE labels_wrapper = TypedData_Wrap_Struct(0, &labels_wrapper_type, labels_table);
     VALUE arg_opt_labels = rb_hash_aref(params, SYM(opt));
     VALUE keywords = rb_hash_aref(params, SYM(keyword));
     VALUE sym_arg_rest = ID2SYM(rb_intern_const("#arg_rest"));
@@ -10519,14 +12333,14 @@ rb_iseq_build_from_ary(rb_iseq_t *iseq, VALUE misc, VALUE locals, VALUE params,
     ISEQ_BODY(iseq)->local_table = tbl = len > 0 ? (ID *)ALLOC_N(ID, ISEQ_BODY(iseq)->local_table_size) : NULL;
 
     for (i = 0; i < len; i++) {
-	VALUE lv = RARRAY_AREF(locals, i);
+        VALUE lv = RARRAY_AREF(locals, i);
 
-	if (sym_arg_rest == lv) {
-	    tbl[i] = 0;
-	}
-	else {
-	    tbl[i] = FIXNUM_P(lv) ? (ID)FIX2LONG(lv) : SYM2ID(CHECK_SYMBOL(lv));
-	}
+        if (sym_arg_rest == lv) {
+            tbl[i] = 0;
+        }
+        else {
+            tbl[i] = FIXNUM_P(lv) ? (ID)FIX2LONG(lv) : SYM2ID(CHECK_SYMBOL(lv));
+        }
     }
 
 #define INT_PARAM(F) int_param(&ISEQ_BODY(iseq)->param.F, params, SYM(F))
@@ -10540,10 +12354,10 @@ rb_iseq_build_from_ary(rb_iseq_t *iseq, VALUE misc, VALUE locals, VALUE params,
 #undef INT_PARAM
     {
 #define INT_PARAM(F) F = (int_param(&x, misc, SYM(F)) ? (unsigned int)x : 0)
-	int x;
-	INT_PARAM(arg_size);
-	INT_PARAM(local_size);
-	INT_PARAM(stack_max);
+        int x;
+        INT_PARAM(arg_size);
+        INT_PARAM(local_size);
+        INT_PARAM(stack_max);
 #undef INT_PARAM
     }
 
@@ -10551,50 +12365,54 @@ rb_iseq_build_from_ary(rb_iseq_t *iseq, VALUE misc, VALUE locals, VALUE params,
 #ifdef USE_ISEQ_NODE_ID
     node_ids = rb_hash_aref(misc, ID2SYM(rb_intern("node_ids")));
     if (!RB_TYPE_P(node_ids, T_ARRAY)) {
-	rb_raise(rb_eTypeError, "node_ids is not an array");
+        rb_raise(rb_eTypeError, "node_ids is not an array");
     }
 #endif
 
     if (RB_TYPE_P(arg_opt_labels, T_ARRAY)) {
-	len = RARRAY_LENINT(arg_opt_labels);
+        len = RARRAY_LENINT(arg_opt_labels);
         ISEQ_BODY(iseq)->param.flags.has_opt = !!(len - 1 >= 0);
 
         if (ISEQ_BODY(iseq)->param.flags.has_opt) {
-	    VALUE *opt_table = ALLOC_N(VALUE, len);
+            VALUE *opt_table = ALLOC_N(VALUE, len);
 
-	    for (i = 0; i < len; i++) {
-		VALUE ent = RARRAY_AREF(arg_opt_labels, i);
-		LABEL *label = register_label(iseq, labels_table, ent);
-		opt_table[i] = (VALUE)label;
-	    }
+            for (i = 0; i < len; i++) {
+                VALUE ent = RARRAY_AREF(arg_opt_labels, i);
+                LABEL *label = register_label(iseq, labels_table, ent);
+                opt_table[i] = (VALUE)label;
+            }
 
             ISEQ_BODY(iseq)->param.opt_num = len - 1;
             ISEQ_BODY(iseq)->param.opt_table = opt_table;
-	}
+        }
     }
     else if (!NIL_P(arg_opt_labels)) {
-	rb_raise(rb_eTypeError, ":opt param is not an array: %+"PRIsVALUE,
-		 arg_opt_labels);
+        rb_raise(rb_eTypeError, ":opt param is not an array: %+"PRIsVALUE,
+                 arg_opt_labels);
     }
 
     if (RB_TYPE_P(keywords, T_ARRAY)) {
         ISEQ_BODY(iseq)->param.keyword = iseq_build_kw(iseq, params, keywords);
     }
     else if (!NIL_P(keywords)) {
-	rb_raise(rb_eTypeError, ":keywords param is not an array: %+"PRIsVALUE,
-		 keywords);
+        rb_raise(rb_eTypeError, ":keywords param is not an array: %+"PRIsVALUE,
+                 keywords);
     }
 
     if (Qtrue == rb_hash_aref(params, SYM(ambiguous_param0))) {
         ISEQ_BODY(iseq)->param.flags.ambiguous_param0 = TRUE;
     }
 
+    if (Qtrue == rb_hash_aref(params, SYM(use_block))) {
+        ISEQ_BODY(iseq)->param.flags.use_block = TRUE;
+    }
+
     if (int_param(&i, params, SYM(kwrest))) {
         struct rb_iseq_param_keyword *keyword = (struct rb_iseq_param_keyword *)ISEQ_BODY(iseq)->param.keyword;
-	if (keyword == NULL) {
+        if (keyword == NULL) {
             ISEQ_BODY(iseq)->param.keyword = keyword = ZALLOC(struct rb_iseq_param_keyword);
-	}
-	keyword->rest_start = i;
+        }
+        keyword->rest_start = i;
         ISEQ_BODY(iseq)->param.flags.has_kwrest = TRUE;
     }
 #undef SYM
@@ -10618,22 +12436,22 @@ rb_dvar_defined(ID id, const rb_iseq_t *iseq)
 {
     if (iseq) {
         const struct rb_iseq_constant_body *body = ISEQ_BODY(iseq);
-	while (body->type == ISEQ_TYPE_BLOCK ||
-	       body->type == ISEQ_TYPE_RESCUE ||
-	       body->type == ISEQ_TYPE_ENSURE ||
-	       body->type == ISEQ_TYPE_EVAL ||
-	       body->type == ISEQ_TYPE_MAIN
-	       ) {
-	    unsigned int i;
-
-	    for (i = 0; i < body->local_table_size; i++) {
-		if (body->local_table[i] == id) {
-		    return 1;
-		}
-	    }
-	    iseq = body->parent_iseq;
+        while (body->type == ISEQ_TYPE_BLOCK ||
+               body->type == ISEQ_TYPE_RESCUE ||
+               body->type == ISEQ_TYPE_ENSURE ||
+               body->type == ISEQ_TYPE_EVAL ||
+               body->type == ISEQ_TYPE_MAIN
+               ) {
+            unsigned int i;
+
+            for (i = 0; i < body->local_table_size; i++) {
+                if (body->local_table[i] == id) {
+                    return 1;
+                }
+            }
+            iseq = body->parent_iseq;
             body = ISEQ_BODY(iseq);
-	}
+        }
     }
     return 0;
 }
@@ -10642,14 +12460,14 @@ int
 rb_local_defined(ID id, const rb_iseq_t *iseq)
 {
     if (iseq) {
-	unsigned int i;
+        unsigned int i;
         const struct rb_iseq_constant_body *const body = ISEQ_BODY(ISEQ_BODY(iseq)->local_iseq);
 
-	for (i=0; i<body->local_table_size; i++) {
-	    if (body->local_table[i] == id) {
-		return 1;
-	    }
-	}
+        for (i=0; i<body->local_table_size; i++) {
+            if (body->local_table[i] == id) {
+                return 1;
+            }
+        }
     }
     return 0;
 }
@@ -10664,28 +12482,38 @@ rb_local_defined(ID id, const rb_iseq_t *iseq)
 #define IBF_ISEQ_ENABLE_LOCAL_BUFFER 0
 #endif
 
-typedef unsigned int ibf_offset_t;
+typedef uint32_t ibf_offset_t;
 #define IBF_OFFSET(ptr) ((ibf_offset_t)(VALUE)(ptr))
 
 #define IBF_MAJOR_VERSION ISEQ_MAJOR_VERSION
-#if RUBY_DEVEL
-#define IBF_DEVEL_VERSION 3
+#ifdef RUBY_DEVEL
+#define IBF_DEVEL_VERSION 5
 #define IBF_MINOR_VERSION (ISEQ_MINOR_VERSION * 10000 + IBF_DEVEL_VERSION)
 #else
 #define IBF_MINOR_VERSION ISEQ_MINOR_VERSION
 #endif
 
+static const char IBF_ENDIAN_MARK =
+#ifdef WORDS_BIGENDIAN
+    'b'
+#else
+    'l'
+#endif
+    ;
+
 struct ibf_header {
     char magic[4]; /* YARB */
-    unsigned int major_version;
-    unsigned int minor_version;
-    unsigned int size;
-    unsigned int extra_size;
+    uint32_t major_version;
+    uint32_t minor_version;
+    uint32_t size;
+    uint32_t extra_size;
 
-    unsigned int iseq_list_size;
-    unsigned int global_object_list_size;
+    uint32_t iseq_list_size;
+    uint32_t global_object_list_size;
     ibf_offset_t iseq_list_offset;
     ibf_offset_t global_object_list_offset;
+    uint8_t endian;
+    uint8_t wordsize;           /* assume no 2048-bit CPU */
 };
 
 struct ibf_dump_buffer {
@@ -10699,8 +12527,6 @@ struct ibf_dump {
     struct ibf_dump_buffer *current_buffer;
 };
 
-rb_iseq_t * iseq_alloc(void);
-
 struct ibf_load_buffer {
     const char *buff;
     ibf_offset_t size;
@@ -10722,7 +12548,7 @@ struct ibf_load {
 
 struct pinned_list {
     long size;
-    VALUE * buffer;
+    VALUE buffer[1];
 };
 
 static void
@@ -10737,25 +12563,14 @@ pinned_list_mark(void *ptr)
     }
 }
 
-static void
-pinned_list_free(void *ptr)
-{
-    struct pinned_list *list = (struct pinned_list *)ptr;
-    xfree(list->buffer);
-    xfree(ptr);
-}
-
-static size_t
-pinned_list_memsize(const void *ptr)
-{
-    struct pinned_list *list = (struct pinned_list *)ptr;
-    return sizeof(struct pinned_list) + (list->size * sizeof(VALUE *));
-}
-
 static const rb_data_type_t pinned_list_type = {
     "pinned_list",
-    {pinned_list_mark, pinned_list_free, pinned_list_memsize,},
-    0, 0, RUBY_TYPED_WB_PROTECTED | RUBY_TYPED_FREE_IMMEDIATELY
+    {
+        pinned_list_mark,
+        RUBY_DEFAULT_FREE,
+        NULL, // No external memory to report,
+    },
+    0, 0, RUBY_TYPED_WB_PROTECTED | RUBY_TYPED_FREE_IMMEDIATELY | RUBY_TYPED_EMBEDDABLE
 };
 
 static VALUE
@@ -10789,13 +12604,10 @@ pinned_list_store(VALUE list, long offset, VALUE object)
 static VALUE
 pinned_list_new(long size)
 {
-    struct pinned_list * ptr;
-    VALUE obj_list =
-        TypedData_Make_Struct(0, struct pinned_list, &pinned_list_type, ptr);
-
-    ptr->buffer = xcalloc(size, sizeof(VALUE));
+    size_t memsize = offsetof(struct pinned_list, buffer) + size * sizeof(VALUE);
+    VALUE obj_list = rb_data_typed_object_zalloc(0, memsize, &pinned_list_type);
+    struct pinned_list * ptr = RTYPEDDATA_GET_DATA(obj_list);
     ptr->size = size;
-
     return obj_list;
 }
 
@@ -10834,8 +12646,13 @@ static ibf_offset_t
 ibf_dump_write(struct ibf_dump *dump, const void *buff, unsigned long size)
 {
     ibf_offset_t pos = ibf_dump_pos(dump);
+#if SIZEOF_LONG > SIZEOF_INT
+    /* ensure the resulting dump does not exceed UINT_MAX */
+    if (size >= UINT_MAX || pos + size >= UINT_MAX) {
+        rb_raise(rb_eRuntimeError, "dump size exceeds");
+    }
+#endif
     rb_str_cat(dump->current_buffer->str, (const char *)buff, size);
-    /* TODO: overflow check */
     return pos;
 }
 
@@ -10944,6 +12761,10 @@ ibf_load_id(const struct ibf_load *load, const ID id_index)
         return 0;
     }
     VALUE sym = ibf_load_object(load, id_index);
+    if (rb_integer_type_p(sym)) {
+        /* Load hidden local variables as indexes */
+        return NUM2ULONG(sym);
+    }
     return rb_sym2id(sym);
 }
 
@@ -11109,17 +12930,18 @@ ibf_dump_code(struct ibf_dump *dump, const rb_iseq_t *iseq)
                 wv = (VALUE)ibf_dump_iseq(dump, (const rb_iseq_t *)op);
                 break;
               case TS_IC:
+                {
+                    IC ic = (IC)op;
+                    VALUE arr = idlist_to_array(ic->segments);
+                    wv = ibf_dump_object(dump, arr);
+                }
+                break;
+              case TS_ISE:
               case TS_IVC:
               case TS_ICVARC:
-              case TS_ISE:
                 {
-                    unsigned int i;
-                    for (i=0; i<body->is_size; i++) {
-                        if (op == (VALUE)&body->is_entries[i]) {
-                            break;
-                        }
-                    }
-                    wv = (VALUE)i;
+                    union iseq_inline_storage_entry *is = (union iseq_inline_storage_entry *)op;
+                    wv = is - ISEQ_IS_ENTRY_START(body, types[op_index]);
                 }
                 break;
               case TS_CALLDATA:
@@ -11142,7 +12964,7 @@ ibf_dump_code(struct ibf_dump *dump, const rb_iseq_t *iseq)
             ibf_dump_write_small_value(dump, wv);
           skip_wv:;
         }
-        assert(insn_len(insn) == op_index+1);
+        RUBY_ASSERT(insn_len(insn) == op_index+1);
     }
 
     return offset;
@@ -11158,12 +12980,26 @@ ibf_load_code(const struct ibf_load *load, rb_iseq_t *iseq, ibf_offset_t bytecod
 
     struct rb_iseq_constant_body *load_body = ISEQ_BODY(iseq);
     struct rb_call_data *cd_entries = load_body->call_data;
-    union iseq_inline_storage_entry *is_entries = load_body->is_entries;
+    int ic_index = 0;
+
+    load_body->iseq_encoded = code;
+    load_body->iseq_size = 0;
+
+    iseq_bits_t * mark_offset_bits;
+
+    iseq_bits_t tmp[1] = {0};
+
+    if (ISEQ_MBITS_BUFLEN(iseq_size) == 1) {
+        mark_offset_bits = tmp;
+    }
+    else {
+        mark_offset_bits = ZALLOC_N(iseq_bits_t, ISEQ_MBITS_BUFLEN(iseq_size));
+    }
+    bool needs_bitmap = false;
 
     for (code_index=0; code_index<iseq_size;) {
         /* opcode */
         const VALUE insn = code[code_index] = ibf_load_small_value(load, &reading_pos);
-        const unsigned int insn_index = code_index;
         const char *types = insn_op_types(insn);
         int op_index;
 
@@ -11180,7 +13016,8 @@ ibf_load_code(const struct ibf_load *load, rb_iseq_t *iseq, ibf_offset_t bytecod
                     code[code_index] = v;
                     if (!SPECIAL_CONST_P(v)) {
                         RB_OBJ_WRITTEN(iseqv, Qundef, v);
-                        FL_SET(iseqv, ISEQ_MARKABLE_ISEQ);
+                        ISEQ_MBITS_SET(mark_offset_bits, code_index);
+                        needs_bitmap = true;
                     }
                     break;
                 }
@@ -11191,7 +13028,7 @@ ibf_load_code(const struct ibf_load *load, rb_iseq_t *iseq, ibf_offset_t bytecod
                     v = rb_hash_dup(v); // hash dumped as frozen
                     RHASH_TBL_RAW(v)->type = &cdhash_type;
                     rb_hash_rehash(v); // hash function changed
-                    freeze_hide_obj(v);
+                    RB_OBJ_SET_SHAREABLE(freeze_hide_obj(v));
 
                     // Overwrite the existing hash in the object list.  This
                     // is to keep the object alive during load time.
@@ -11199,8 +13036,9 @@ ibf_load_code(const struct ibf_load *load, rb_iseq_t *iseq, ibf_offset_t bytecod
                     pinned_list_store(load->current_buffer->obj_list, (long)op, v);
 
                     code[code_index] = v;
+                    ISEQ_MBITS_SET(mark_offset_bits, code_index);
                     RB_OBJ_WRITTEN(iseqv, Qundef, v);
-                    FL_SET(iseqv, ISEQ_MARKABLE_ISEQ);
+                    needs_bitmap = true;
                     break;
                 }
               case TS_ISEQ:
@@ -11210,25 +13048,46 @@ ibf_load_code(const struct ibf_load *load, rb_iseq_t *iseq, ibf_offset_t bytecod
                     code[code_index] = v;
                     if (!SPECIAL_CONST_P(v)) {
                         RB_OBJ_WRITTEN(iseqv, Qundef, v);
-                        FL_SET(iseqv, ISEQ_MARKABLE_ISEQ);
+                        ISEQ_MBITS_SET(mark_offset_bits, code_index);
+                        needs_bitmap = true;
                     }
                     break;
                 }
-              case TS_ISE:
               case TS_IC:
-              case TS_IVC:
-              case TS_ICVARC:
                 {
                     VALUE op = ibf_load_small_value(load, &reading_pos);
-                    code[code_index] = (VALUE)&is_entries[op];
+                    VALUE arr = ibf_load_object(load, op);
+
+                    IC ic = &ISEQ_IS_IC_ENTRY(load_body, ic_index++);
+                    ic->segments = array_to_idlist(arr);
+
+                    code[code_index] = (VALUE)ic;
+                }
+                break;
+              case TS_ISE:
+              case TS_ICVARC:
+              case TS_IVC:
+                {
+                    unsigned int op = (unsigned int)ibf_load_small_value(load, &reading_pos);
 
-                    if (insn == BIN(opt_getinlinecache) && operand_type == TS_IC) {
-                        // Store the instruction index for opt_getinlinecache on the IC for
-                        // YJIT to invalidate code when opt_setinlinecache runs.
-                        is_entries[op].ic_cache.get_insn_idx = insn_index;
+                    ISE ic = ISEQ_IS_ENTRY_START(load_body, operand_type) + op;
+                    code[code_index] = (VALUE)ic;
+
+                    if (operand_type == TS_IVC) {
+                        IVC cache = (IVC)ic;
+
+                        if (insn == BIN(setinstancevariable)) {
+                            ID iv_name = (ID)code[code_index - 1];
+                            cache->iv_set_name = iv_name;
+                        }
+                        else {
+                            cache->iv_set_name = 0;
+                        }
+
+                        vm_ic_attr_index_initialize(cache, INVALID_SHAPE_ID);
                     }
+
                 }
-                FL_SET(iseqv, ISEQ_MARKABLE_ISEQ);
                 break;
               case TS_CALLDATA:
                 {
@@ -11256,11 +13115,24 @@ ibf_load_code(const struct ibf_load *load, rb_iseq_t *iseq, ibf_offset_t bytecod
             rb_raise(rb_eRuntimeError, "operand size mismatch");
         }
     }
-    load_body->iseq_encoded = code;
+
     load_body->iseq_size = code_index;
 
-    assert(code_index == iseq_size);
-    assert(reading_pos == bytecode_offset + bytecode_size);
+    if (ISEQ_MBITS_BUFLEN(load_body->iseq_size) == 1) {
+        load_body->mark_bits.single = mark_offset_bits[0];
+    }
+    else {
+        if (needs_bitmap) {
+            load_body->mark_bits.list = mark_offset_bits;
+        }
+        else {
+            load_body->mark_bits.list = 0;
+            ruby_xfree(mark_offset_bits);
+        }
+    }
+
+    RUBY_ASSERT(code_index == iseq_size);
+    RUBY_ASSERT(reading_pos == bytecode_offset + bytecode_size);
     return code;
 }
 
@@ -11321,19 +13193,17 @@ ibf_load_param_keyword(const struct ibf_load *load, ibf_offset_t param_keyword_o
 {
     if (param_keyword_offset) {
         struct rb_iseq_param_keyword *kw = IBF_R(param_keyword_offset, struct rb_iseq_param_keyword, 1);
-        ID *ids = IBF_R(kw->table, ID, kw->num);
         int dv_num = kw->num - kw->required_num;
-        VALUE *dvs = IBF_R(kw->default_values, VALUE, dv_num);
-        int i;
+        VALUE *dvs = dv_num ? IBF_R(kw->default_values, VALUE, dv_num) : NULL;
 
-        for (i=0; i<kw->num; i++) {
-            ids[i] = ibf_load_id(load, ids[i]);
-        }
+        int i;
         for (i=0; i<dv_num; i++) {
             dvs[i] = ibf_load_object(load, dvs[i]);
         }
 
-        kw->table = ids;
+        // Will be set once the local table is loaded.
+        kw->table = NULL;
+
         kw->default_values = dvs;
         return kw;
     }
@@ -11418,14 +13288,19 @@ ibf_dump_local_table(struct ibf_dump *dump, const rb_iseq_t *iseq)
     int i;
 
     for (i=0; i<size; i++) {
-        table[i] = ibf_dump_id(dump, body->local_table[i]);
+        VALUE v = ibf_dump_id(dump, body->local_table[i]);
+        if (v == 0) {
+            /* Dump hidden local variables as indexes, so load_from_binary will work with them */
+            v = ibf_dump_object(dump, ULONG2NUM(body->local_table[i]));
+        }
+        table[i] = v;
     }
 
     IBF_W_ALIGN(ID);
     return ibf_dump_write(dump, table, sizeof(ID) * size);
 }
 
-static ID *
+static const ID *
 ibf_load_local_table(const struct ibf_load *load, ibf_offset_t local_table_offset, int size)
 {
     if (size > 0) {
@@ -11435,7 +13310,14 @@ ibf_load_local_table(const struct ibf_load *load, ibf_offset_t local_table_offse
         for (i=0; i<size; i++) {
             table[i] = ibf_load_id(load, table[i]);
         }
-        return table;
+
+        if (size == 1 && table[0] == idERROR_INFO) {
+            xfree(table);
+            return rb_iseq_shared_exc_local_tbl;
+        }
+        else {
+            return table;
+        }
     }
     else {
         return NULL;
@@ -11443,6 +13325,28 @@ ibf_load_local_table(const struct ibf_load *load, ibf_offset_t local_table_offse
 }
 
 static ibf_offset_t
+ibf_dump_lvar_states(struct ibf_dump *dump, const rb_iseq_t *iseq)
+{
+    const struct rb_iseq_constant_body *const body = ISEQ_BODY(iseq);
+    const int size = body->local_table_size;
+    IBF_W_ALIGN(enum lvar_state);
+    return ibf_dump_write(dump, body->lvar_states, sizeof(enum lvar_state) * (body->lvar_states ? size : 0));
+}
+
+static enum lvar_state *
+ibf_load_lvar_states(const struct ibf_load *load, ibf_offset_t lvar_states_offset, int size, const ID *local_table)
+{
+    if (local_table == rb_iseq_shared_exc_local_tbl ||
+        size <= 0) {
+        return NULL;
+    }
+    else {
+        enum lvar_state *states = IBF_R(lvar_states_offset, enum lvar_state, size);
+        return states;
+    }
+}
+
+static ibf_offset_t
 ibf_dump_catch_table(struct ibf_dump *dump, const rb_iseq_t *iseq)
 {
     const struct iseq_catch_table *table = ISEQ_BODY(iseq)->catch_table;
@@ -11472,30 +13376,31 @@ ibf_dump_catch_table(struct ibf_dump *dump, const rb_iseq_t *iseq)
     }
 }
 
-static struct iseq_catch_table *
-ibf_load_catch_table(const struct ibf_load *load, ibf_offset_t catch_table_offset, unsigned int size)
+static void
+ibf_load_catch_table(const struct ibf_load *load, ibf_offset_t catch_table_offset, unsigned int size, const rb_iseq_t *parent_iseq)
 {
     if (size) {
-        struct iseq_catch_table *table = ruby_xmalloc(iseq_catch_table_bytes(size));
+        struct iseq_catch_table *table = ruby_xcalloc(1, iseq_catch_table_bytes(size));
         table->size = size;
+        ISEQ_BODY(parent_iseq)->catch_table = table;
 
         ibf_offset_t reading_pos = catch_table_offset;
 
         unsigned int i;
         for (i=0; i<table->size; i++) {
             int iseq_index = (int)ibf_load_small_value(load, &reading_pos);
-            table->entries[i].type = (enum catch_type)ibf_load_small_value(load, &reading_pos);
+            table->entries[i].type = (enum rb_catch_type)ibf_load_small_value(load, &reading_pos);
             table->entries[i].start = (unsigned int)ibf_load_small_value(load, &reading_pos);
             table->entries[i].end = (unsigned int)ibf_load_small_value(load, &reading_pos);
             table->entries[i].cont = (unsigned int)ibf_load_small_value(load, &reading_pos);
             table->entries[i].sp = (unsigned int)ibf_load_small_value(load, &reading_pos);
 
-            table->entries[i].iseq = ibf_load_iseq(load, (const rb_iseq_t *)(VALUE)iseq_index);
+            rb_iseq_t *catch_iseq = (rb_iseq_t *)ibf_load_iseq(load, (const rb_iseq_t *)(VALUE)iseq_index);
+            RB_OBJ_WRITE(parent_iseq, UNALIGNED_MEMBER_PTR(&table->entries[i], iseq), catch_iseq);
         }
-        return table;
     }
     else {
-        return NULL;
+        ISEQ_BODY(parent_iseq)->catch_table = NULL;
     }
 }
 
@@ -11539,15 +13444,44 @@ ibf_dump_ci_entries(struct ibf_dump *dump, const rb_iseq_t *iseq)
     return offset;
 }
 
+struct outer_variable_pair {
+    ID id;
+    VALUE name;
+    VALUE val;
+};
+
+struct outer_variable_list {
+    size_t num;
+    struct outer_variable_pair pairs[1];
+};
+
 static enum rb_id_table_iterator_result
-dump_outer_variable(ID id, VALUE val, void *dump)
+store_outer_variable(ID id, VALUE val, void *dump)
 {
-    ibf_dump_write_small_value(dump, ibf_dump_id(dump, id));
-    ibf_dump_write_small_value(dump, val);
-
+    struct outer_variable_list *ovlist = dump;
+    struct outer_variable_pair *pair = &ovlist->pairs[ovlist->num++];
+    pair->id = id;
+    pair->name = rb_id2str(id);
+    pair->val = val;
     return ID_TABLE_CONTINUE;
 }
 
+static int
+outer_variable_cmp(const void *a, const void *b, void *arg)
+{
+    const struct outer_variable_pair *ap = (const struct outer_variable_pair *)a;
+    const struct outer_variable_pair *bp = (const struct outer_variable_pair *)b;
+
+    if (!ap->name) {
+        return -1;
+    }
+    else if (!bp->name) {
+        return 1;
+    }
+
+    return rb_str_cmp(ap->name, bp->name);
+}
+
 static ibf_offset_t
 ibf_dump_outer_variables(struct ibf_dump *dump, const rb_iseq_t *iseq)
 {
@@ -11555,12 +13489,24 @@ ibf_dump_outer_variables(struct ibf_dump *dump, const rb_iseq_t *iseq)
 
     ibf_offset_t offset = ibf_dump_pos(dump);
 
-    if (ovs) {
-        ibf_dump_write_small_value(dump, (VALUE)rb_id_table_size(ovs));
-        rb_id_table_foreach(ovs, dump_outer_variable, (void *)dump);
-    }
-    else {
-        ibf_dump_write_small_value(dump, (VALUE)0);
+    size_t size = ovs ? rb_id_table_size(ovs) : 0;
+    ibf_dump_write_small_value(dump, (VALUE)size);
+    if (size > 0) {
+        VALUE buff;
+        size_t buffsize =
+            rb_size_mul_add_or_raise(sizeof(struct outer_variable_pair), size,
+                                     offsetof(struct outer_variable_list, pairs),
+                                     rb_eArgError);
+        struct outer_variable_list *ovlist = RB_ALLOCV(buff, buffsize);
+        ovlist->num = 0;
+        rb_id_table_foreach(ovs, store_outer_variable, ovlist);
+        ruby_qsort(ovlist->pairs, size, sizeof(struct outer_variable_pair), outer_variable_cmp, NULL);
+        for (size_t i = 0; i < size; ++i) {
+            ID id = ovlist->pairs[i].id;
+            ID val = ovlist->pairs[i].val;
+            ibf_dump_write_small_value(dump, ibf_dump_id(dump, id));
+            ibf_dump_write_small_value(dump, val);
+        }
     }
 
     return offset;
@@ -11573,6 +13519,11 @@ ibf_load_ci_entries(const struct ibf_load *load,
                     unsigned int ci_size,
                     struct rb_call_data **cd_ptr)
 {
+    if (!ci_size) {
+        *cd_ptr = NULL;
+        return;
+    }
+
     ibf_offset_t reading_pos = ci_entries_offset;
 
     unsigned int i;
@@ -11591,6 +13542,7 @@ ibf_load_ci_entries(const struct ibf_load *load,
             int kwlen = (int)ibf_load_small_value(load, &reading_pos);
             if (kwlen > 0) {
                 kwarg = rb_xmalloc_mul_add(kwlen, sizeof(VALUE), sizeof(struct rb_callinfo_kwarg));
+                kwarg->references = 0;
                 kwarg->keyword_len = kwlen;
                 for (int j=0; j<kwlen; j++) {
                     VALUE keyword = ibf_load_small_value(load, &reading_pos);
@@ -11636,7 +13588,7 @@ ibf_load_outer_variables(const struct ibf_load * load, ibf_offset_t outer_variab
 static ibf_offset_t
 ibf_dump_iseq_each(struct ibf_dump *dump, const rb_iseq_t *iseq)
 {
-    assert(dump->current_buffer == &dump->global_buffer);
+    RUBY_ASSERT(dump->current_buffer == &dump->global_buffer);
 
     unsigned int *positions;
 
@@ -11667,6 +13619,7 @@ ibf_dump_iseq_each(struct ibf_dump *dump, const rb_iseq_t *iseq)
     ruby_xfree(positions);
 
     const ibf_offset_t local_table_offset = ibf_dump_local_table(dump, iseq);
+    const ibf_offset_t lvar_states_offset = ibf_dump_lvar_states(dump, iseq);
     const unsigned int catch_table_size =   body->catch_table ? body->catch_table->size : 0;
     const ibf_offset_t catch_table_offset = ibf_dump_catch_table(dump, iseq);
     const int parent_iseq_index =           ibf_dump_iseq(dump, ISEQ_BODY(iseq)->parent_iseq);
@@ -11695,7 +13648,11 @@ ibf_dump_iseq_each(struct ibf_dump *dump, const rb_iseq_t *iseq)
         (body->param.flags.has_block        << 6) |
         (body->param.flags.ambiguous_param0 << 7) |
         (body->param.flags.accepts_no_kwarg << 8) |
-        (body->param.flags.ruby2_keywords   << 9);
+        (body->param.flags.ruby2_keywords   << 9) |
+        (body->param.flags.anon_rest        << 10) |
+        (body->param.flags.anon_kwrest      << 11) |
+        (body->param.flags.use_block        << 12) |
+        (body->param.flags.forwardable      << 13) ;
 
 #if IBF_ISEQ_ENABLE_LOCAL_BUFFER
 #  define IBF_BODY_OFFSET(x) (x)
@@ -11730,6 +13687,7 @@ ibf_dump_iseq_each(struct ibf_dump *dump, const rb_iseq_t *iseq)
     ibf_dump_write_small_value(dump, IBF_BODY_OFFSET(insns_info_positions_offset));
     ibf_dump_write_small_value(dump, body->insns_info.size);
     ibf_dump_write_small_value(dump, IBF_BODY_OFFSET(local_table_offset));
+    ibf_dump_write_small_value(dump, IBF_BODY_OFFSET(lvar_states_offset));
     ibf_dump_write_small_value(dump, catch_table_size);
     ibf_dump_write_small_value(dump, IBF_BODY_OFFSET(catch_table_offset));
     ibf_dump_write_small_value(dump, parent_iseq_index);
@@ -11739,11 +13697,14 @@ ibf_dump_iseq_each(struct ibf_dump *dump, const rb_iseq_t *iseq)
     ibf_dump_write_small_value(dump, IBF_BODY_OFFSET(outer_variables_offset));
     ibf_dump_write_small_value(dump, body->variable.flip_count);
     ibf_dump_write_small_value(dump, body->local_table_size);
-    ibf_dump_write_small_value(dump, body->is_size);
+    ibf_dump_write_small_value(dump, body->ivc_size);
+    ibf_dump_write_small_value(dump, body->icvarc_size);
+    ibf_dump_write_small_value(dump, body->ise_size);
+    ibf_dump_write_small_value(dump, body->ic_size);
     ibf_dump_write_small_value(dump, body->ci_size);
     ibf_dump_write_small_value(dump, body->stack_max);
-    ibf_dump_write_small_value(dump, body->catch_except_p);
-    ibf_dump_write_small_value(dump, body->builtin_inline_p);
+    ibf_dump_write_small_value(dump, body->builtin_attrs);
+    ibf_dump_write_small_value(dump, body->prism ? 1 : 0);
 
 #undef IBF_BODY_OFFSET
 
@@ -11828,7 +13789,7 @@ ibf_load_iseq_each(struct ibf_load *load, rb_iseq_t *iseq, ibf_offset_t offset)
     const VALUE location_pathobj_index = ibf_load_small_value(load, &reading_pos);
     const VALUE location_base_label_index = ibf_load_small_value(load, &reading_pos);
     const VALUE location_label_index = ibf_load_small_value(load, &reading_pos);
-    const VALUE location_first_lineno = ibf_load_small_value(load, &reading_pos);
+    const int location_first_lineno = (int)ibf_load_small_value(load, &reading_pos);
     const int location_node_id = (int)ibf_load_small_value(load, &reading_pos);
     const int location_code_location_beg_pos_lineno = (int)ibf_load_small_value(load, &reading_pos);
     const int location_code_location_beg_pos_column = (int)ibf_load_small_value(load, &reading_pos);
@@ -11838,6 +13799,7 @@ ibf_load_iseq_each(struct ibf_load *load, rb_iseq_t *iseq, ibf_offset_t offset)
     const ibf_offset_t insns_info_positions_offset = (ibf_offset_t)IBF_BODY_OFFSET(ibf_load_small_value(load, &reading_pos));
     const unsigned int insns_info_size = (unsigned int)ibf_load_small_value(load, &reading_pos);
     const ibf_offset_t local_table_offset = (ibf_offset_t)IBF_BODY_OFFSET(ibf_load_small_value(load, &reading_pos));
+    const ibf_offset_t lvar_states_offset = (ibf_offset_t)IBF_BODY_OFFSET(ibf_load_small_value(load, &reading_pos));
     const unsigned int catch_table_size = (unsigned int)ibf_load_small_value(load, &reading_pos);
     const ibf_offset_t catch_table_offset = (ibf_offset_t)IBF_BODY_OFFSET(ibf_load_small_value(load, &reading_pos));
     const int parent_iseq_index = (int)ibf_load_small_value(load, &reading_pos);
@@ -11847,11 +13809,50 @@ ibf_load_iseq_each(struct ibf_load *load, rb_iseq_t *iseq, ibf_offset_t offset)
     const ibf_offset_t outer_variables_offset = (ibf_offset_t)IBF_BODY_OFFSET(ibf_load_small_value(load, &reading_pos));
     const rb_snum_t variable_flip_count = (rb_snum_t)ibf_load_small_value(load, &reading_pos);
     const unsigned int local_table_size = (unsigned int)ibf_load_small_value(load, &reading_pos);
-    const unsigned int is_size = (unsigned int)ibf_load_small_value(load, &reading_pos);
+
+    const unsigned int ivc_size = (unsigned int)ibf_load_small_value(load, &reading_pos);
+    const unsigned int icvarc_size = (unsigned int)ibf_load_small_value(load, &reading_pos);
+    const unsigned int ise_size = (unsigned int)ibf_load_small_value(load, &reading_pos);
+    const unsigned int ic_size = (unsigned int)ibf_load_small_value(load, &reading_pos);
+
     const unsigned int ci_size = (unsigned int)ibf_load_small_value(load, &reading_pos);
     const unsigned int stack_max = (unsigned int)ibf_load_small_value(load, &reading_pos);
-    const char catch_except_p = (char)ibf_load_small_value(load, &reading_pos);
-    const bool builtin_inline_p = (bool)ibf_load_small_value(load, &reading_pos);
+    const unsigned int builtin_attrs = (unsigned int)ibf_load_small_value(load, &reading_pos);
+    const bool prism = (bool)ibf_load_small_value(load, &reading_pos);
+
+    // setup fname and dummy frame
+    VALUE path = ibf_load_object(load, location_pathobj_index);
+    {
+        VALUE realpath = Qnil;
+
+        if (RB_TYPE_P(path, T_STRING)) {
+            realpath = path = rb_fstring(path);
+        }
+        else if (RB_TYPE_P(path, T_ARRAY)) {
+            VALUE pathobj = path;
+            if (RARRAY_LEN(pathobj) != 2) {
+                rb_raise(rb_eRuntimeError, "path object size mismatch");
+            }
+            path = rb_fstring(RARRAY_AREF(pathobj, 0));
+            realpath = RARRAY_AREF(pathobj, 1);
+            if (!NIL_P(realpath)) {
+                if (!RB_TYPE_P(realpath, T_STRING)) {
+                    rb_raise(rb_eArgError, "unexpected realpath %"PRIxVALUE
+                             "(%x), path=%+"PRIsVALUE,
+                             realpath, TYPE(realpath), path);
+                }
+                realpath = rb_fstring(realpath);
+            }
+        }
+        else {
+            rb_raise(rb_eRuntimeError, "unexpected path object");
+        }
+        rb_iseq_pathobj_set(iseq, path, realpath);
+    }
+
+    // push dummy frame
+    rb_execution_context_t *ec = GET_EC();
+    VALUE dummy_frame = rb_vm_push_frame_fname(ec, path);
 
 #undef IBF_BODY_OFFSET
 
@@ -11867,6 +13868,10 @@ ibf_load_iseq_each(struct ibf_load *load, rb_iseq_t *iseq, ibf_offset_t offset)
     load_body->param.flags.ambiguous_param0 = (param_flags >> 7) & 1;
     load_body->param.flags.accepts_no_kwarg = (param_flags >> 8) & 1;
     load_body->param.flags.ruby2_keywords = (param_flags >> 9) & 1;
+    load_body->param.flags.anon_rest = (param_flags >> 10) & 1;
+    load_body->param.flags.anon_kwrest = (param_flags >> 11) & 1;
+    load_body->param.flags.use_block = (param_flags >> 12) & 1;
+    load_body->param.flags.forwardable = (param_flags >> 13) & 1;
     load_body->param.size = param_size;
     load_body->param.lead_num = param_lead_num;
     load_body->param.opt_num = param_opt_num;
@@ -11875,7 +13880,6 @@ ibf_load_iseq_each(struct ibf_load *load, rb_iseq_t *iseq, ibf_offset_t offset)
     load_body->param.post_num = param_post_num;
     load_body->param.block_start = param_block_start;
     load_body->local_table_size = local_table_size;
-    load_body->is_size = is_size;
     load_body->ci_size = ci_size;
     load_body->insns_info.size = insns_info_size;
 
@@ -11890,10 +13894,20 @@ ibf_load_iseq_each(struct ibf_load *load, rb_iseq_t *iseq, ibf_offset_t offset)
     load_body->location.code_location.beg_pos.column = location_code_location_beg_pos_column;
     load_body->location.code_location.end_pos.lineno = location_code_location_end_pos_lineno;
     load_body->location.code_location.end_pos.column = location_code_location_end_pos_column;
-    load_body->catch_except_p = catch_except_p;
-    load_body->builtin_inline_p = builtin_inline_p;
+    load_body->builtin_attrs = builtin_attrs;
+    load_body->prism = prism;
 
-    load_body->is_entries           = ZALLOC_N(union iseq_inline_storage_entry, is_size);
+    load_body->ivc_size             = ivc_size;
+    load_body->icvarc_size          = icvarc_size;
+    load_body->ise_size             = ise_size;
+    load_body->ic_size              = ic_size;
+
+    if (ISEQ_IS_SIZE(load_body)) {
+        load_body->is_entries       = ZALLOC_N(union iseq_inline_storage_entry, ISEQ_IS_SIZE(load_body));
+    }
+    else {
+        load_body->is_entries       = NULL;
+    }
                                       ibf_load_ci_entries(load, ci_entries_offset, ci_size, &load_body->call_data);
     load_body->outer_variables      = ibf_load_outer_variables(load, outer_variables_offset);
     load_body->param.opt_table      = ibf_load_param_opt_table(load, param_opt_table_offset, param_opt_num);
@@ -11902,10 +13916,23 @@ ibf_load_iseq_each(struct ibf_load *load, rb_iseq_t *iseq, ibf_offset_t offset)
     load_body->insns_info.body      = ibf_load_insns_info_body(load, insns_info_body_offset, insns_info_size);
     load_body->insns_info.positions = ibf_load_insns_info_positions(load, insns_info_positions_offset, insns_info_size);
     load_body->local_table          = ibf_load_local_table(load, local_table_offset, local_table_size);
-    load_body->catch_table          = ibf_load_catch_table(load, catch_table_offset, catch_table_size);
-    load_body->parent_iseq          = ibf_load_iseq(load, (const rb_iseq_t *)(VALUE)parent_iseq_index);
-    load_body->local_iseq           = ibf_load_iseq(load, (const rb_iseq_t *)(VALUE)local_iseq_index);
-    load_body->mandatory_only_iseq  = ibf_load_iseq(load, (const rb_iseq_t *)(VALUE)mandatory_only_iseq_index);
+    load_body->lvar_states          = ibf_load_lvar_states(load, lvar_states_offset, local_table_size, load_body->local_table);
+    ibf_load_catch_table(load, catch_table_offset, catch_table_size, iseq);
+
+    const rb_iseq_t *parent_iseq = ibf_load_iseq(load, (const rb_iseq_t *)(VALUE)parent_iseq_index);
+    const rb_iseq_t *local_iseq = ibf_load_iseq(load, (const rb_iseq_t *)(VALUE)local_iseq_index);
+    const rb_iseq_t *mandatory_only_iseq = ibf_load_iseq(load, (const rb_iseq_t *)(VALUE)mandatory_only_iseq_index);
+
+    RB_OBJ_WRITE(iseq, &load_body->parent_iseq, parent_iseq);
+    RB_OBJ_WRITE(iseq, &load_body->local_iseq, local_iseq);
+    RB_OBJ_WRITE(iseq, &load_body->mandatory_only_iseq, mandatory_only_iseq);
+
+    // This must be done after the local table is loaded.
+    if (load_body->param.keyword != NULL) {
+        RUBY_ASSERT(load_body->local_table);
+        struct rb_iseq_param_keyword *keyword = (struct rb_iseq_param_keyword *) load_body->param.keyword;
+        keyword->table = &load_body->local_table[keyword->bits_start - keyword->num];
+    }
 
     ibf_load_code(load, iseq, bytecode_offset, bytecode_size, iseq_size);
 #if VM_INSN_INFO_TABLE_IMPL == 2
@@ -11918,33 +13945,6 @@ ibf_load_iseq_each(struct ibf_load *load, rb_iseq_t *iseq, ibf_offset_t offset)
     load->current_buffer = &load->global_buffer;
 #endif
 
-    {
-        VALUE realpath = Qnil, path = ibf_load_object(load, location_pathobj_index);
-        if (RB_TYPE_P(path, T_STRING)) {
-            realpath = path = rb_fstring(path);
-        }
-        else if (RB_TYPE_P(path, T_ARRAY)) {
-            VALUE pathobj = path;
-            if (RARRAY_LEN(pathobj) != 2) {
-                rb_raise(rb_eRuntimeError, "path object size mismatch");
-            }
-            path = rb_fstring(RARRAY_AREF(pathobj, 0));
-            realpath = RARRAY_AREF(pathobj, 1);
-            if (!NIL_P(realpath)) {
-                if (!RB_TYPE_P(realpath, T_STRING)) {
-                    rb_raise(rb_eArgError, "unexpected realpath %"PRIxVALUE
-                             "(%x), path=%+"PRIsVALUE,
-                             realpath, TYPE(realpath), path);
-                }
-                realpath = rb_fstring(realpath);
-            }
-        }
-        else {
-            rb_raise(rb_eRuntimeError, "unexpected path object");
-        }
-        rb_iseq_pathobj_set(iseq, path, realpath);
-    }
-
     RB_OBJ_WRITE(iseq, &load_body->location.base_label,    ibf_load_location_str(load, location_base_label_index));
     RB_OBJ_WRITE(iseq, &load_body->location.label,         ibf_load_location_str(load, location_label_index));
 
@@ -11952,6 +13952,9 @@ ibf_load_iseq_each(struct ibf_load *load, rb_iseq_t *iseq, ibf_offset_t offset)
     load->current_buffer = saved_buffer;
 #endif
     verify_call_cache(iseq);
+
+    RB_GC_GUARD(dummy_frame);
+    rb_vm_pop_frame_no_int(ec);
 }
 
 struct ibf_dump_iseq_list_arg
@@ -11975,7 +13978,7 @@ ibf_dump_iseq_list_i(st_data_t key, st_data_t val, st_data_t ptr)
 static void
 ibf_dump_iseq_list(struct ibf_dump *dump, struct ibf_header *header)
 {
-    VALUE offset_list = rb_ary_tmp_new(dump->iseq_table->num_entries);
+    VALUE offset_list = rb_ary_hidden_new(dump->iseq_table->num_entries);
 
     struct ibf_dump_iseq_list_arg args;
     args.dump = dump;
@@ -11996,8 +13999,6 @@ ibf_dump_iseq_list(struct ibf_dump *dump, struct ibf_header *header)
     header->iseq_list_size = (unsigned int)size;
 }
 
-#define IBF_OBJECT_INTERNAL FL_PROMOTED0
-
 /*
  * Binary format
  * - ibf_object_header
@@ -12057,14 +14058,18 @@ struct ibf_object_symbol {
 
 #define IBF_ALIGNED_OFFSET(align, offset) /* offset > 0 */ \
     ((((offset) - 1) / (align) + 1) * (align))
-#define IBF_OBJBODY(type, offset) (const type *)\
+/* No cast, since it's UB to create an unaligned pointer.
+ * Leave as void* for use with memcpy in those cases.
+ * We align the offset, but the buffer pointer is only VALUE aligned,
+ * so the returned pointer may be unaligned for `type` .*/
+#define IBF_OBJBODY(type, offset) \
     ibf_load_check_offset(load, IBF_ALIGNED_OFFSET(RUBY_ALIGNOF(type), offset))
 
 static const void *
 ibf_load_check_offset(const struct ibf_load *load, size_t offset)
 {
     if (offset >= load->current_buffer->size) {
-	rb_raise(rb_eIndexError, "object offset out of range: %"PRIdSIZE, offset);
+        rb_raise(rb_eIndexError, "object offset out of range: %"PRIdSIZE, offset);
     }
     return load->current_buffer->buff + offset;
 }
@@ -12125,11 +14130,11 @@ ibf_load_object_class(const struct ibf_load *load, const struct ibf_object_heade
 
     switch (cindex) {
       case IBF_OBJECT_CLASS_OBJECT:
-	return rb_cObject;
+        return rb_cObject;
       case IBF_OBJECT_CLASS_ARRAY:
-	return rb_cArray;
+        return rb_cArray;
       case IBF_OBJECT_CLASS_STANDARD_ERROR:
-	return rb_eStandardError;
+        return rb_eStandardError;
       case IBF_OBJECT_CLASS_NO_MATCHING_PATTERN_ERROR:
         return rb_eNoMatchingPatternError;
       case IBF_OBJECT_CLASS_TYPE_ERROR:
@@ -12152,8 +14157,12 @@ ibf_dump_object_float(struct ibf_dump *dump, VALUE obj)
 static VALUE
 ibf_load_object_float(const struct ibf_load *load, const struct ibf_object_header *header, ibf_offset_t offset)
 {
-    const double *dblp = IBF_OBJBODY(double, offset);
-    return DBL2NUM(*dblp);
+    double d;
+    /* Avoid unaligned VFP load on ARMv7; IBF payload may be unaligned (C99 6.3.2.3 p7). */
+    memcpy(&d, IBF_OBJBODY(double, offset), sizeof(d));
+    VALUE f = DBL2NUM(d);
+    if (!FLONUM_P(f)) RB_OBJ_SET_SHAREABLE(f);
+    return f;
 }
 
 static void
@@ -12190,7 +14199,7 @@ ibf_load_object_string(const struct ibf_load *load, const struct ibf_object_head
 
     VALUE str;
     if (header->frozen && !header->internal) {
-        str = rb_enc_interned_str(ptr, len, rb_enc_from_index(encindex));
+        str = rb_enc_literal_str(ptr, len, rb_enc_from_index(encindex));
     }
     else {
         str = rb_enc_str_new(ptr, len, rb_enc_from_index(encindex));
@@ -12224,7 +14233,7 @@ ibf_load_object_regexp(const struct ibf_load *load, const struct ibf_object_head
     VALUE reg = rb_reg_compile(srcstr, (int)regexp.option, NULL, 0);
 
     if (header->internal) rb_obj_hide(reg);
-    if (header->frozen)   rb_obj_freeze(reg);
+    if (header->frozen) RB_OBJ_SET_SHAREABLE(rb_obj_freeze(reg));
 
     return reg;
 }
@@ -12247,7 +14256,7 @@ ibf_load_object_array(const struct ibf_load *load, const struct ibf_object_heade
 
     const long len = (long)ibf_load_small_value(load, &reading_pos);
 
-    VALUE ary = rb_ary_new_capa(len);
+    VALUE ary = header->internal ? rb_ary_hidden_new(len) : rb_ary_new_capa(len);
     int i;
 
     for (i=0; i<len; i++) {
@@ -12255,8 +14264,10 @@ ibf_load_object_array(const struct ibf_load *load, const struct ibf_object_heade
         rb_ary_push(ary, ibf_load_object(load, index));
     }
 
-    if (header->internal) rb_obj_hide(ary);
-    if (header->frozen)   rb_obj_freeze(ary);
+    if (header->frozen) {
+        rb_ary_freeze(ary);
+        rb_ractor_make_shareable(ary); // TODO: check elements
+    }
 
     return ary;
 }
@@ -12301,7 +14312,9 @@ ibf_load_object_hash(const struct ibf_load *load, const struct ibf_object_header
     rb_hash_rehash(obj);
 
     if (header->internal) rb_obj_hide(obj);
-    if (header->frozen)   rb_obj_freeze(obj);
+    if (header->frozen) {
+        RB_OBJ_SET_FROZEN_SHAREABLE(obj);
+    }
 
     return obj;
 }
@@ -12337,7 +14350,7 @@ ibf_load_object_struct(const struct ibf_load *load, const struct ibf_object_head
     VALUE end = ibf_load_object(load, range->end);
     VALUE obj = rb_range_new(beg, end, range->excl);
     if (header->internal) rb_obj_hide(obj);
-    if (header->frozen)   rb_obj_freeze(obj);
+    if (header->frozen)   RB_OBJ_SET_FROZEN_SHAREABLE(obj);
     return obj;
 }
 
@@ -12358,10 +14371,14 @@ ibf_load_object_bignum(const struct ibf_load *load, const struct ibf_object_head
     const struct ibf_object_bignum *bignum = IBF_OBJBODY(struct ibf_object_bignum, offset);
     int sign = bignum->slen > 0;
     ssize_t len = sign > 0 ? bignum->slen : -1 * bignum->slen;
-    VALUE obj = rb_integer_unpack(bignum->digits, len * 2, 2, 0,
-				  INTEGER_PACK_LITTLE_ENDIAN | (sign == 0 ? INTEGER_PACK_NEGATIVE : 0));
+    const int big_unpack_flags = /* c.f. rb_big_unpack() */
+        INTEGER_PACK_LSWORD_FIRST |
+        INTEGER_PACK_NATIVE_BYTE_ORDER;
+    VALUE obj = rb_integer_unpack(bignum->digits, len, sizeof(BDIGIT), 0,
+                                  big_unpack_flags |
+                                  (sign == 0 ? INTEGER_PACK_NEGATIVE : 0));
     if (header->internal) rb_obj_hide(obj);
-    if (header->frozen)   rb_obj_freeze(obj);
+    if (header->frozen)   RB_OBJ_SET_FROZEN_SHAREABLE(obj);
     return obj;
 }
 
@@ -12422,7 +14439,7 @@ ibf_load_object_complex_rational(const struct ibf_load *load, const struct ibf_o
       rb_complex_new(a, b) : rb_rational_new(a, b);
 
     if (header->internal) rb_obj_hide(obj);
-    if (header->frozen)   rb_obj_freeze(obj);
+    if (header->frozen) rb_ractor_make_shareable(rb_obj_freeze(obj));
     return obj;
 }
 
@@ -12451,7 +14468,7 @@ ibf_load_object_symbol(const struct ibf_load *load, const struct ibf_object_head
 }
 
 typedef void (*ibf_dump_object_function)(struct ibf_dump *dump, VALUE obj);
-static ibf_dump_object_function dump_object_functions[RUBY_T_MASK+1] = {
+static const ibf_dump_object_function dump_object_functions[RUBY_T_MASK+1] = {
     ibf_dump_object_unsupported, /* T_NONE */
     ibf_dump_object_unsupported, /* T_OBJECT */
     ibf_dump_object_class,       /* T_CLASS */
@@ -12535,7 +14552,7 @@ ibf_dump_object_object(struct ibf_dump *dump, VALUE obj)
     else {
         obj_header.internal = SPECIAL_CONST_P(obj) ? FALSE : (RBASIC_CLASS(obj) == 0) ? TRUE : FALSE;
         obj_header.special_const = FALSE;
-        obj_header.frozen = FL_TEST(obj, FL_FREEZE) ? TRUE : FALSE;
+        obj_header.frozen = OBJ_FROZEN(obj) ? TRUE : FALSE;
         ibf_dump_object_object_header(dump, obj_header);
         (*dump_object_functions[obj_header.type])(dump, obj);
     }
@@ -12544,7 +14561,7 @@ ibf_dump_object_object(struct ibf_dump *dump, VALUE obj)
 }
 
 typedef VALUE (*ibf_load_object_function)(const struct ibf_load *load, const struct ibf_object_header *header, ibf_offset_t offset);
-static ibf_load_object_function load_object_functions[RUBY_T_MASK+1] = {
+static const ibf_load_object_function load_object_functions[RUBY_T_MASK+1] = {
     ibf_load_object_unsupported, /* T_NONE */
     ibf_load_object_unsupported, /* T_OBJECT */
     ibf_load_object_class,       /* T_CLASS */
@@ -12643,7 +14660,7 @@ static void
 ibf_dump_object_list(struct ibf_dump *dump, ibf_offset_t *obj_list_offset, unsigned int *obj_list_size)
 {
     st_table *obj_table = dump->current_buffer->obj_table;
-    VALUE offset_list = rb_ary_tmp_new(obj_table->num_entries);
+    VALUE offset_list = rb_ary_hidden_new(obj_table->num_entries);
 
     struct ibf_dump_object_list_arg args;
     args.dump = dump;
@@ -12687,14 +14704,13 @@ ibf_dump_free(void *ptr)
         st_free_table(dump->iseq_table);
         dump->iseq_table = 0;
     }
-    ruby_xfree(dump);
 }
 
 static size_t
 ibf_dump_memsize(const void *ptr)
 {
     struct ibf_dump *dump = (struct ibf_dump *)ptr;
-    size_t size = sizeof(*dump);
+    size_t size = 0;
     if (dump->iseq_table) size += st_memsize(dump->iseq_table);
     if (dump->global_buffer.obj_table) size += st_memsize(dump->global_buffer.obj_table);
     return size;
@@ -12703,7 +14719,7 @@ ibf_dump_memsize(const void *ptr)
 static const rb_data_type_t ibf_dump_type = {
     "ibf_dump",
     {ibf_dump_mark, ibf_dump_free, ibf_dump_memsize,},
-    0, 0, RUBY_TYPED_WB_PROTECTED | RUBY_TYPED_FREE_IMMEDIATELY
+    0, 0, RUBY_TYPED_FREE_IMMEDIATELY | RUBY_TYPED_EMBEDDABLE
 };
 
 static void
@@ -12739,7 +14755,6 @@ rb_iseq_ibf_dump(const rb_iseq_t *iseq, VALUE opt)
     ibf_dump_setup(dump, dump_obj);
 
     ibf_dump_write(dump, &header, sizeof(header));
-    ibf_dump_write(dump, RUBY_PLATFORM, strlen(RUBY_PLATFORM) + 1);
     ibf_dump_iseq(dump, iseq);
 
     header.magic[0] = 'Y'; /* YARB */
@@ -12748,6 +14763,8 @@ rb_iseq_ibf_dump(const rb_iseq_t *iseq, VALUE opt)
     header.magic[3] = 'B';
     header.major_version = IBF_MAJOR_VERSION;
     header.minor_version = IBF_MINOR_VERSION;
+    header.endian = IBF_ENDIAN_MARK;
+    header.wordsize = (uint8_t)SIZEOF_VALUE;
     ibf_dump_iseq_list(dump, &header);
     ibf_dump_object_list(dump, &header.global_object_list_offset, &header.global_object_list_size);
     header.size = ibf_dump_pos(dump);
@@ -12765,8 +14782,6 @@ rb_iseq_ibf_dump(const rb_iseq_t *iseq, VALUE opt)
     ibf_dump_overwrite(dump, &header, sizeof(header), 0);
 
     str = dump->global_buffer.str;
-    ibf_dump_free(dump);
-    DATA_PTR(dump_obj) = NULL;
     RB_GC_GUARD(dump_obj);
     return str;
 }
@@ -12786,8 +14801,8 @@ rb_ibf_load_iseq_complete(rb_iseq_t *iseq)
     load->iseq = iseq;
 #if IBF_ISEQ_DEBUG
     fprintf(stderr, "rb_ibf_load_iseq_complete: index=%#x offset=%#x size=%#x\n",
-	    iseq->aux.loader.index, offset,
-	    load->header->size);
+            iseq->aux.loader.index, offset,
+            load->header->size);
 #endif
     ibf_load_iseq_each(load, iseq, offset);
     ISEQ_COMPILE_DATA_CLEAR(iseq);
@@ -12797,7 +14812,7 @@ rb_ibf_load_iseq_complete(rb_iseq_t *iseq)
 }
 
 #if USE_LAZY_LOAD
-MJIT_FUNC_EXPORTED const rb_iseq_t *
+const rb_iseq_t *
 rb_iseq_complete(const rb_iseq_t *iseq)
 {
     rb_ibf_load_iseq_complete((rb_iseq_t *)iseq);
@@ -12812,86 +14827,86 @@ ibf_load_iseq(const struct ibf_load *load, const rb_iseq_t *index_iseq)
 
 #if IBF_ISEQ_DEBUG
     fprintf(stderr, "ibf_load_iseq: index_iseq=%p iseq_list=%p\n",
-	    (void *)index_iseq, (void *)load->iseq_list);
+            (void *)index_iseq, (void *)load->iseq_list);
 #endif
     if (iseq_index == -1) {
-	return NULL;
+        return NULL;
     }
     else {
-	VALUE iseqv = pinned_list_fetch(load->iseq_list, iseq_index);
+        VALUE iseqv = pinned_list_fetch(load->iseq_list, iseq_index);
 
 #if IBF_ISEQ_DEBUG
-	fprintf(stderr, "ibf_load_iseq: iseqv=%p\n", (void *)iseqv);
+        fprintf(stderr, "ibf_load_iseq: iseqv=%p\n", (void *)iseqv);
 #endif
-	if (iseqv) {
-	    return (rb_iseq_t *)iseqv;
-	}
-	else {
-	    rb_iseq_t *iseq = iseq_imemo_alloc();
+        if (iseqv) {
+            return (rb_iseq_t *)iseqv;
+        }
+        else {
+            rb_iseq_t *iseq = iseq_imemo_alloc();
 #if IBF_ISEQ_DEBUG
-	    fprintf(stderr, "ibf_load_iseq: new iseq=%p\n", (void *)iseq);
+            fprintf(stderr, "ibf_load_iseq: new iseq=%p\n", (void *)iseq);
 #endif
-	    FL_SET((VALUE)iseq, ISEQ_NOT_LOADED_YET);
-	    iseq->aux.loader.obj = load->loader_obj;
-	    iseq->aux.loader.index = iseq_index;
+            FL_SET((VALUE)iseq, ISEQ_NOT_LOADED_YET);
+            iseq->aux.loader.obj = load->loader_obj;
+            iseq->aux.loader.index = iseq_index;
 #if IBF_ISEQ_DEBUG
-	    fprintf(stderr, "ibf_load_iseq: iseq=%p loader_obj=%p index=%d\n",
-		    (void *)iseq, (void *)load->loader_obj, iseq_index);
+            fprintf(stderr, "ibf_load_iseq: iseq=%p loader_obj=%p index=%d\n",
+                    (void *)iseq, (void *)load->loader_obj, iseq_index);
 #endif
-	    pinned_list_store(load->iseq_list, iseq_index, (VALUE)iseq);
+            pinned_list_store(load->iseq_list, iseq_index, (VALUE)iseq);
 
-#if !USE_LAZY_LOAD
+            if (!USE_LAZY_LOAD || GET_VM()->builtin_function_table) {
 #if IBF_ISEQ_DEBUG
-	    fprintf(stderr, "ibf_load_iseq: loading iseq=%p\n", (void *)iseq);
+                fprintf(stderr, "ibf_load_iseq: loading iseq=%p\n", (void *)iseq);
 #endif
-            rb_ibf_load_iseq_complete(iseq);
-#else
-            if (GET_VM()->builtin_function_table) {
                 rb_ibf_load_iseq_complete(iseq);
             }
-#endif /* !USE_LAZY_LOAD */
 
 #if IBF_ISEQ_DEBUG
-	    fprintf(stderr, "ibf_load_iseq: iseq=%p loaded %p\n",
-		    (void *)iseq, (void *)load->iseq);
+            fprintf(stderr, "ibf_load_iseq: iseq=%p loaded %p\n",
+                    (void *)iseq, (void *)load->iseq);
 #endif
-	    return iseq;
-	}
+            return iseq;
+        }
     }
 }
 
 static void
 ibf_load_setup_bytes(struct ibf_load *load, VALUE loader_obj, const char *bytes, size_t size)
 {
+    struct ibf_header *header = (struct ibf_header *)bytes;
     load->loader_obj = loader_obj;
     load->global_buffer.buff = bytes;
-    load->header = (struct ibf_header *)load->global_buffer.buff;
-    load->global_buffer.size = load->header->size;
-    load->global_buffer.obj_list_offset = load->header->global_object_list_offset;
-    load->global_buffer.obj_list_size = load->header->global_object_list_size;
-    RB_OBJ_WRITE(loader_obj, &load->iseq_list, pinned_list_new(load->header->iseq_list_size));
+    load->header = header;
+    load->global_buffer.size = header->size;
+    load->global_buffer.obj_list_offset = header->global_object_list_offset;
+    load->global_buffer.obj_list_size = header->global_object_list_size;
+    RB_OBJ_WRITE(loader_obj, &load->iseq_list, pinned_list_new(header->iseq_list_size));
     RB_OBJ_WRITE(loader_obj, &load->global_buffer.obj_list, pinned_list_new(load->global_buffer.obj_list_size));
     load->iseq = NULL;
 
     load->current_buffer = &load->global_buffer;
 
-    if (size < load->header->size) {
-	rb_raise(rb_eRuntimeError, "broken binary format");
+    if (size < header->size) {
+        rb_raise(rb_eRuntimeError, "broken binary format");
     }
-    if (strncmp(load->header->magic, "YARB", 4) != 0) {
-	rb_raise(rb_eRuntimeError, "unknown binary format");
+    if (strncmp(header->magic, "YARB", 4) != 0) {
+        rb_raise(rb_eRuntimeError, "unknown binary format");
     }
-    if (load->header->major_version != IBF_MAJOR_VERSION ||
-	load->header->minor_version != IBF_MINOR_VERSION) {
-	rb_raise(rb_eRuntimeError, "unmatched version file (%u.%u for %u.%u)",
-		 load->header->major_version, load->header->minor_version, IBF_MAJOR_VERSION, IBF_MINOR_VERSION);
+    if (header->major_version != IBF_MAJOR_VERSION ||
+        header->minor_version != IBF_MINOR_VERSION) {
+        rb_raise(rb_eRuntimeError, "unmatched version file (%u.%u for %u.%u)",
+                 header->major_version, header->minor_version, IBF_MAJOR_VERSION, IBF_MINOR_VERSION);
     }
-    if (strcmp(load->global_buffer.buff + sizeof(struct ibf_header), RUBY_PLATFORM) != 0) {
-	rb_raise(rb_eRuntimeError, "unmatched platform");
+    if (header->endian != IBF_ENDIAN_MARK) {
+        rb_raise(rb_eRuntimeError, "unmatched endian: %c", header->endian);
     }
-    if (load->header->iseq_list_offset % RUBY_ALIGNOF(ibf_offset_t)) {
+    if (header->wordsize != SIZEOF_VALUE) {
+        rb_raise(rb_eRuntimeError, "unmatched word size: %d", header->wordsize);
+    }
+    if (header->iseq_list_offset % RUBY_ALIGNOF(ibf_offset_t)) {
         rb_raise(rb_eArgError, "unaligned iseq list offset: %u",
-                 load->header->iseq_list_offset);
+                 header->iseq_list_offset);
     }
     if (load->global_buffer.obj_list_offset % RUBY_ALIGNOF(ibf_offset_t)) {
         rb_raise(rb_eArgError, "unaligned object list offset: %u",
@@ -12902,15 +14917,17 @@ ibf_load_setup_bytes(struct ibf_load *load, VALUE loader_obj, const char *bytes,
 static void
 ibf_load_setup(struct ibf_load *load, VALUE loader_obj, VALUE str)
 {
+    StringValue(str);
+
     if (RSTRING_LENINT(str) < (int)sizeof(struct ibf_header)) {
         rb_raise(rb_eRuntimeError, "broken binary format");
     }
 
-#if USE_LAZY_LOAD
-    str = rb_str_new(RSTRING_PTR(str), RSTRING_LEN(str));
-#endif
+    if (USE_LAZY_LOAD) {
+        str = rb_str_new(RSTRING_PTR(str), RSTRING_LEN(str));
+    }
 
-    ibf_load_setup_bytes(load, loader_obj, StringValuePtr(str), RSTRING_LEN(str));
+    ibf_load_setup_bytes(load, loader_obj, RSTRING_PTR(str), RSTRING_LEN(str));
     RB_OBJ_WRITE(loader_obj, &load->str, str);
 }
 
@@ -12982,3 +14999,5 @@ rb_iseq_ibf_load_extra_data(VALUE str)
     RB_GC_GUARD(loader_obj);
     return extra_str;
 }
+
+#include "prism_compile.c"
diff --git a/complex.c b/complex.c
index 92f4e812d6..85d724f273 100644
--- a/complex.c
+++ b/complex.c
@@ -24,6 +24,7 @@
 #include "internal/numeric.h"
 #include "internal/object.h"
 #include "internal/rational.h"
+#include "internal/string.h"
 #include "ruby_assert.h"
 
 #define ZERO INT2FIX(0)
@@ -97,7 +98,7 @@ inline static VALUE
 f_div(VALUE x, VALUE y)
 {
     if (FIXNUM_P(y) && FIX2LONG(y) == 1)
-	return x;
+        return x;
     return rb_funcall(x, '/', 1, y);
 }
 
@@ -152,7 +153,7 @@ f_sub(VALUE x, VALUE y)
 {
     if (FIXNUM_ZERO_P(y) &&
         LIKELY(rb_method_basic_definition_p(CLASS_OF(x), idMINUS))) {
-	return x;
+        return x;
     }
     return rb_funcall(x, '-', 1, y);
 }
@@ -262,7 +263,7 @@ inline static VALUE
 f_to_i(VALUE x)
 {
     if (RB_TYPE_P(x, T_STRING))
-	return rb_str_to_inum(x, 10, 0);
+        return rb_str_to_inum(x, 10, 0);
     return rb_funcall(x, id_to_i, 0);
 }
 
@@ -270,7 +271,7 @@ inline static VALUE
 f_to_f(VALUE x)
 {
     if (RB_TYPE_P(x, T_STRING))
-	return DBL2NUM(rb_str_to_dbl(x, 0));
+        return DBL2NUM(rb_str_to_dbl(x, 0));
     return rb_funcall(x, id_to_f, 0);
 }
 
@@ -280,9 +281,9 @@ inline static int
 f_eqeq_p(VALUE x, VALUE y)
 {
     if (FIXNUM_P(x) && FIXNUM_P(y))
-	return x == y;
+        return x == y;
     else if (RB_FLOAT_TYPE_P(x) || RB_FLOAT_TYPE_P(y))
-	return NUM2DBL(x) == NUM2DBL(y);
+        return NUM2DBL(x) == NUM2DBL(y);
     return (int)rb_equal(x, y);
 }
 
@@ -316,7 +317,7 @@ f_negative_p(VALUE x)
 
 #define f_positive_p(x) (!f_negative_p(x))
 
-inline static int
+inline static bool
 f_zero_p(VALUE x)
 {
     if (RB_FLOAT_TYPE_P(x)) {
@@ -329,7 +330,7 @@ f_zero_p(VALUE x)
         const VALUE num = RRATIONAL(x)->num;
         return FIXNUM_ZERO_P(num);
     }
-    return (int)rb_equal(x, ZERO);
+    return rb_equal(x, ZERO) != 0;
 }
 
 #define f_nonzero_p(x) (!f_zero_p(x))
@@ -349,7 +350,7 @@ f_finite_p(VALUE x)
         return TRUE;
     }
     else if (RB_FLOAT_TYPE_P(x)) {
-	return isfinite(RFLOAT_VALUE(x));
+        return isfinite(RFLOAT_VALUE(x));
     }
     return RTEST(rb_funcallv(x, id_finite_p, 0, 0));
 }
@@ -361,7 +362,7 @@ f_infinite_p(VALUE x)
         return FALSE;
     }
     else if (RB_FLOAT_TYPE_P(x)) {
-	return isinf(RFLOAT_VALUE(x));
+        return isinf(RFLOAT_VALUE(x));
     }
     return RTEST(rb_funcallv(x, id_infinite_p, 0, 0));
 }
@@ -391,11 +392,12 @@ k_numeric_p(VALUE x)
 inline static VALUE
 nucomp_s_new_internal(VALUE klass, VALUE real, VALUE imag)
 {
-    NEWOBJ_OF(obj, struct RComplex, klass, T_COMPLEX | (RGENGC_WB_PROTECTED_COMPLEX ? FL_WB_PROTECTED : 0));
+    NEWOBJ_OF(obj, struct RComplex, klass,
+            T_COMPLEX | (RGENGC_WB_PROTECTED_COMPLEX ? FL_WB_PROTECTED : 0), sizeof(struct RComplex), 0);
 
     RCOMPLEX_SET_REAL(obj, real);
     RCOMPLEX_SET_IMAG(obj, imag);
-    OBJ_FREEZE_RAW((VALUE)obj);
+    OBJ_FREEZE((VALUE)obj);
 
     return (VALUE)obj;
 }
@@ -409,27 +411,34 @@ nucomp_s_alloc(VALUE klass)
 inline static VALUE
 f_complex_new_bang1(VALUE klass, VALUE x)
 {
-    assert(!RB_TYPE_P(x, T_COMPLEX));
+    RUBY_ASSERT(!RB_TYPE_P(x, T_COMPLEX));
     return nucomp_s_new_internal(klass, x, ZERO);
 }
 
 inline static VALUE
 f_complex_new_bang2(VALUE klass, VALUE x, VALUE y)
 {
-    assert(!RB_TYPE_P(x, T_COMPLEX));
-    assert(!RB_TYPE_P(y, T_COMPLEX));
+    RUBY_ASSERT(!RB_TYPE_P(x, T_COMPLEX));
+    RUBY_ASSERT(!RB_TYPE_P(y, T_COMPLEX));
     return nucomp_s_new_internal(klass, x, y);
 }
 
-inline static void
+WARN_UNUSED_RESULT(inline static VALUE nucomp_real_check(VALUE num));
+inline static VALUE
 nucomp_real_check(VALUE num)
 {
     if (!RB_INTEGER_TYPE_P(num) &&
-	!RB_FLOAT_TYPE_P(num) &&
-	!RB_TYPE_P(num, T_RATIONAL)) {
-	if (!k_numeric_p(num) || !f_real_p(num))
-	    rb_raise(rb_eTypeError, "not a real");
+        !RB_FLOAT_TYPE_P(num) &&
+        !RB_TYPE_P(num, T_RATIONAL)) {
+        if (RB_TYPE_P(num, T_COMPLEX) && nucomp_real_p(num)) {
+            VALUE real = RCOMPLEX(num)->real;
+            RUBY_ASSERT(!RB_TYPE_P(real, T_COMPLEX));
+            return real;
+        }
+        if (!k_numeric_p(num) || !f_real_p(num))
+            rb_raise(rb_eTypeError, "not a real");
     }
+    return num;
 }
 
 inline static VALUE
@@ -439,39 +448,46 @@ nucomp_s_canonicalize_internal(VALUE klass, VALUE real, VALUE imag)
     complex_r = RB_TYPE_P(real, T_COMPLEX);
     complex_i = RB_TYPE_P(imag, T_COMPLEX);
     if (!complex_r && !complex_i) {
-	return nucomp_s_new_internal(klass, real, imag);
+        return nucomp_s_new_internal(klass, real, imag);
     }
     else if (!complex_r) {
-	get_dat1(imag);
+        get_dat1(imag);
 
-	return nucomp_s_new_internal(klass,
-				     f_sub(real, dat->imag),
-				     f_add(ZERO, dat->real));
+        return nucomp_s_new_internal(klass,
+                                     f_sub(real, dat->imag),
+                                     f_add(ZERO, dat->real));
     }
     else if (!complex_i) {
-	get_dat1(real);
+        get_dat1(real);
 
-	return nucomp_s_new_internal(klass,
-				     dat->real,
-				     f_add(dat->imag, imag));
+        return nucomp_s_new_internal(klass,
+                                     dat->real,
+                                     f_add(dat->imag, imag));
     }
     else {
-	get_dat2(real, imag);
+        get_dat2(real, imag);
 
-	return nucomp_s_new_internal(klass,
-				     f_sub(adat->real, bdat->imag),
-				     f_add(adat->imag, bdat->real));
+        return nucomp_s_new_internal(klass,
+                                     f_sub(adat->real, bdat->imag),
+                                     f_add(adat->imag, bdat->real));
     }
 }
 
 /*
  * call-seq:
- *    Complex.rect(real[, imag])         ->  complex
- *    Complex.rectangular(real[, imag])  ->  complex
+ *   Complex.rect(real, imag = 0) -> complex
+ *
+ * Returns a new \Complex object formed from the arguments,
+ * each of which must be an instance of Numeric,
+ * or an instance of one of its subclasses:
+ * \Complex, Float, Integer, Rational;
+ * see {Rectangular Coordinates}[rdoc-ref:Complex@Rectangular+Coordinates]:
  *
- * Returns a complex object which denotes the given rectangular form.
+ *   Complex.rect(3)             # => (3+0i)
+ *   Complex.rect(3, Math::PI)   # => (3+3.141592653589793i)
+ *   Complex.rect(-3, -Math::PI) # => (-3-3.141592653589793i)
  *
- *    Complex.rectangular(1, 2)  #=> (1+2i)
+ * \Complex.rectangular is an alias for \Complex.rect.
  */
 static VALUE
 nucomp_s_new(int argc, VALUE *argv, VALUE klass)
@@ -480,22 +496,26 @@ nucomp_s_new(int argc, VALUE *argv, VALUE klass)
 
     switch (rb_scan_args(argc, argv, "11", &real, &imag)) {
       case 1:
-	nucomp_real_check(real);
-	imag = ZERO;
-	break;
+        real = nucomp_real_check(real);
+        imag = ZERO;
+        break;
       default:
-	nucomp_real_check(real);
-	nucomp_real_check(imag);
-	break;
+        real = nucomp_real_check(real);
+        imag = nucomp_real_check(imag);
+        break;
     }
 
-    return nucomp_s_canonicalize_internal(klass, real, imag);
+    return nucomp_s_new_internal(klass, real, imag);
 }
 
 inline static VALUE
 f_complex_new2(VALUE klass, VALUE x, VALUE y)
 {
-    assert(!RB_TYPE_P(x, T_COMPLEX));
+    if (RB_TYPE_P(x, T_COMPLEX)) {
+        get_dat1(x);
+        x = dat->real;
+        y = f_add(dat->imag, y);
+    }
     return nucomp_s_canonicalize_internal(klass, x, y);
 }
 
@@ -504,39 +524,54 @@ static VALUE nucomp_s_convert(int argc, VALUE *argv, VALUE klass);
 
 /*
  * call-seq:
- *    Complex(x[, y], exception: true)  ->  numeric or nil
- *
- * Returns x+i*y;
- *
- *    Complex(1, 2)    #=> (1+2i)
- *    Complex('1+2i')  #=> (1+2i)
- *    Complex(nil)     #=> TypeError
- *    Complex(1, nil)  #=> TypeError
- *
- *    Complex(1, nil, exception: false)  #=> nil
- *    Complex('1+2', exception: false)   #=> nil
- *
- * Syntax of string form:
- *
- *   string form = extra spaces , complex , extra spaces ;
- *   complex = real part | [ sign ] , imaginary part
- *           | real part , sign , imaginary part
- *           | rational , "@" , rational ;
- *   real part = rational ;
- *   imaginary part = imaginary unit | unsigned rational , imaginary unit ;
- *   rational = [ sign ] , unsigned rational ;
- *   unsigned rational = numerator | numerator , "/" , denominator ;
- *   numerator = integer part | fractional part | integer part , fractional part ;
- *   denominator = digits ;
- *   integer part = digits ;
- *   fractional part = "." , digits , [ ( "e" | "E" ) , [ sign ] , digits ] ;
- *   imaginary unit = "i" | "I" | "j" | "J" ;
- *   sign = "-" | "+" ;
- *   digits = digit , { digit | "_" , digit };
- *   digit = "0" | "1" | "2" | "3" | "4" | "5" | "6" | "7" | "8" | "9" ;
- *   extra spaces = ? \s* ? ;
- *
- * See String#to_c.
+ *   Complex(real, imag = 0, exception: true) -> complex or nil
+ *   Complex(s, exception: true) -> complex or nil
+ *
+ * Returns a new \Complex object if the arguments are valid;
+ * otherwise raises an exception if +exception+ is +true+;
+ * otherwise returns +nil+.
+ *
+ * With Numeric arguments +real+ and +imag+,
+ * returns <tt>Complex.rect(real, imag)</tt> if the arguments are valid.
+ *
+ * With string argument +s+, returns a new \Complex object if the argument is valid;
+ * the string may have:
+ *
+ * - One or two numeric substrings,
+ *   each of which specifies a Complex, Float, Integer, Numeric, or Rational value,
+ *   specifying {rectangular coordinates}[rdoc-ref:Complex@Rectangular+Coordinates]:
+ *
+ *   - Sign-separated real and imaginary numeric substrings
+ *     (with trailing character <tt>'i'</tt>):
+ *
+ *       Complex('1+2i')  # => (1+2i)
+ *       Complex('+1+2i') # => (1+2i)
+ *       Complex('+1-2i') # => (1-2i)
+ *       Complex('-1+2i') # => (-1+2i)
+ *       Complex('-1-2i') # => (-1-2i)
+ *
+ *   - Real-only numeric string (without trailing character <tt>'i'</tt>):
+ *
+ *       Complex('1')  # => (1+0i)
+ *       Complex('+1') # => (1+0i)
+ *       Complex('-1') # => (-1+0i)
+ *
+ *   - Imaginary-only numeric string (with trailing character <tt>'i'</tt>):
+ *
+ *       Complex('1i')  # => (0+1i)
+ *       Complex('+1i') # => (0+1i)
+ *       Complex('-1i') # => (0-1i)
+ *
+ * - At-sign separated real and imaginary rational substrings,
+ *   each of which specifies a Rational value,
+ *   specifying {polar coordinates}[rdoc-ref:Complex@Polar+Coordinates]:
+ *
+ *     Complex('1/2@3/4')   # => (0.36584443443691045+0.34081938001166706i)
+ *     Complex('+1/2@+3/4') # => (0.36584443443691045+0.34081938001166706i)
+ *     Complex('+1/2@-3/4') # => (0.36584443443691045-0.34081938001166706i)
+ *     Complex('-1/2@+3/4') # => (-0.36584443443691045-0.34081938001166706i)
+ *     Complex('-1/2@-3/4') # => (-0.36584443443691045+0.34081938001166706i)
+ *
  */
 static VALUE
 nucomp_f_complex(int argc, VALUE *argv, VALUE klass)
@@ -550,7 +585,7 @@ nucomp_f_complex(int argc, VALUE *argv, VALUE klass)
     if (!NIL_P(opts)) {
         raise = rb_opts_exception_p(opts, raise);
     }
-    if (argc > 0 && CLASS_OF(a1) == rb_cComplex && a2 == Qundef) {
+    if (argc > 0 && CLASS_OF(a1) == rb_cComplex && UNDEF_P(a2)) {
         return a1;
     }
     return nucomp_convert(rb_cComplex, a1, a2, raise);
@@ -580,14 +615,14 @@ static VALUE
 m_cos(VALUE x)
 {
     if (!RB_TYPE_P(x, T_COMPLEX))
-	return m_cos_bang(x);
+        return m_cos_bang(x);
     {
-	get_dat1(x);
-	return f_complex_new2(rb_cComplex,
-			      f_mul(m_cos_bang(dat->real),
-				    m_cosh_bang(dat->imag)),
-			      f_mul(f_negate(m_sin_bang(dat->real)),
-				    m_sinh_bang(dat->imag)));
+        get_dat1(x);
+        return f_complex_new2(rb_cComplex,
+                              f_mul(m_cos_bang(dat->real),
+                                    m_cosh_bang(dat->imag)),
+                              f_mul(f_negate(m_sin_bang(dat->real)),
+                                    m_sinh_bang(dat->imag)));
     }
 }
 
@@ -595,55 +630,61 @@ static VALUE
 m_sin(VALUE x)
 {
     if (!RB_TYPE_P(x, T_COMPLEX))
-	return m_sin_bang(x);
+        return m_sin_bang(x);
     {
-	get_dat1(x);
-	return f_complex_new2(rb_cComplex,
-			      f_mul(m_sin_bang(dat->real),
-				    m_cosh_bang(dat->imag)),
-			      f_mul(m_cos_bang(dat->real),
-				    m_sinh_bang(dat->imag)));
+        get_dat1(x);
+        return f_complex_new2(rb_cComplex,
+                              f_mul(m_sin_bang(dat->real),
+                                    m_cosh_bang(dat->imag)),
+                              f_mul(m_cos_bang(dat->real),
+                                    m_sinh_bang(dat->imag)));
     }
 }
 
 static VALUE
-f_complex_polar(VALUE klass, VALUE x, VALUE y)
+f_complex_polar_real(VALUE klass, VALUE x, VALUE y)
 {
-    assert(!RB_TYPE_P(x, T_COMPLEX));
-    assert(!RB_TYPE_P(y, T_COMPLEX));
     if (f_zero_p(x) || f_zero_p(y)) {
-	return nucomp_s_new_internal(klass, x, RFLOAT_0);
+        return nucomp_s_new_internal(klass, x, RFLOAT_0);
     }
     if (RB_FLOAT_TYPE_P(y)) {
-	const double arg = RFLOAT_VALUE(y);
-	if (arg == M_PI) {
-	    x = f_negate(x);
-	    y = RFLOAT_0;
-	}
-	else if (arg == M_PI_2) {
-	    y = x;
-	    x = RFLOAT_0;
-	}
-	else if (arg == M_PI_2+M_PI) {
-	    y = f_negate(x);
-	    x = RFLOAT_0;
-	}
-	else if (RB_FLOAT_TYPE_P(x)) {
-	    const double abs = RFLOAT_VALUE(x);
-	    const double real = abs * cos(arg), imag = abs * sin(arg);
-	    x = DBL2NUM(real);
-	    y = DBL2NUM(imag);
-	}
-	else {
+        const double arg = RFLOAT_VALUE(y);
+        if (arg == M_PI) {
+            x = f_negate(x);
+            y = RFLOAT_0;
+        }
+        else if (arg == M_PI_2) {
+            y = x;
+            x = RFLOAT_0;
+        }
+        else if (arg == M_PI_2+M_PI) {
+            y = f_negate(x);
+            x = RFLOAT_0;
+        }
+        else if (RB_FLOAT_TYPE_P(x)) {
+            const double abs = RFLOAT_VALUE(x);
+            const double real = abs * cos(arg), imag = abs * sin(arg);
+            x = DBL2NUM(real);
+            y = DBL2NUM(imag);
+        }
+        else {
             const double ax = sin(arg), ay = cos(arg);
             y = f_mul(x, DBL2NUM(ax));
             x = f_mul(x, DBL2NUM(ay));
-	}
-	return nucomp_s_new_internal(klass, x, y);
+        }
+        return nucomp_s_new_internal(klass, x, y);
     }
     return nucomp_s_canonicalize_internal(klass,
-					  f_mul(x, m_cos(y)),
-					  f_mul(x, m_sin(y)));
+                                          f_mul(x, m_cos(y)),
+                                          f_mul(x, m_sin(y)));
+}
+
+static VALUE
+f_complex_polar(VALUE klass, VALUE x, VALUE y)
+{
+    x = nucomp_real_check(x);
+    y = nucomp_real_check(y);
+    return f_complex_polar_real(klass, x, y);
 }
 
 #ifdef HAVE___COSPI
@@ -665,12 +706,12 @@ rb_dbl_complex_new_polar_pi(double abs, double ang)
     int pos = fr == +0.5;
 
     if (pos || fr == -0.5) {
-	if ((modf(fi / 2.0, &fi) != fr) ^ pos) abs = -abs;
-	return rb_complex_new(RFLOAT_0, DBL2NUM(abs));
+        if ((modf(fi / 2.0, &fi) != fr) ^ pos) abs = -abs;
+        return rb_complex_new(RFLOAT_0, DBL2NUM(abs));
     }
     else if (fr == 0.0) {
-	if (modf(fi / 2.0, &fi) != 0.0) abs = -abs;
-	return DBL2NUM(abs);
+        if (modf(fi / 2.0, &fi) != 0.0) abs = -abs;
+        return DBL2NUM(abs);
     }
     else {
         const double real = abs * cospi(ang), imag = abs * sinpi(ang);
@@ -680,48 +721,51 @@ rb_dbl_complex_new_polar_pi(double abs, double ang)
 
 /*
  * call-seq:
- *    Complex.polar(abs[, arg])  ->  complex
+ *   Complex.polar(abs, arg = 0) -> complex
  *
- * Returns a complex object which denotes the given polar form.
+ * Returns a new \Complex object formed from the arguments,
+ * each of which must be an instance of Numeric,
+ * or an instance of one of its subclasses:
+ * \Complex, Float, Integer, Rational.
+ * Argument +arg+ is given in radians;
+ * see {Polar Coordinates}[rdoc-ref:Complex@Polar+Coordinates]:
+ *
+ *   Complex.polar(3)        # => (3+0i)
+ *   Complex.polar(3, 2.0)   # => (-1.2484405096414273+2.727892280477045i)
+ *   Complex.polar(-3, -2.0) # => (1.2484405096414273+2.727892280477045i)
  *
- *    Complex.polar(3, 0)            #=> (3.0+0.0i)
- *    Complex.polar(3, Math::PI/2)   #=> (1.836909530733566e-16+3.0i)
- *    Complex.polar(3, Math::PI)     #=> (-3.0+3.673819061467132e-16i)
- *    Complex.polar(3, -Math::PI/2)  #=> (1.836909530733566e-16-3.0i)
  */
 static VALUE
 nucomp_s_polar(int argc, VALUE *argv, VALUE klass)
 {
     VALUE abs, arg;
 
-    switch (rb_scan_args(argc, argv, "11", &abs, &arg)) {
-      case 1:
-	nucomp_real_check(abs);
-	return nucomp_s_new_internal(klass, abs, ZERO);
-      default:
-	nucomp_real_check(abs);
-	nucomp_real_check(arg);
-	break;
-    }
-    if (RB_TYPE_P(abs, T_COMPLEX)) {
-        get_dat1(abs);
-        abs = dat->real;
+    argc = rb_scan_args(argc, argv, "11", &abs, &arg);
+    abs = nucomp_real_check(abs);
+    if (argc == 2) {
+        arg = nucomp_real_check(arg);
     }
-    if (RB_TYPE_P(arg, T_COMPLEX)) {
-        get_dat1(arg);
-        arg = dat->real;
+    else {
+        arg = ZERO;
     }
-    return f_complex_polar(klass, abs, arg);
+    return f_complex_polar_real(klass, abs, arg);
 }
 
 /*
  * call-seq:
- *    cmp.real  ->  real
+ *   real -> numeric
+ *
+ * Returns the real value for +self+:
  *
- * Returns the real part.
+ *   Complex.rect(7).real     # => 7
+ *   Complex.rect(9, -4).real # => 9
+ *
+ * If +self+ was created with
+ * {polar coordinates}[rdoc-ref:Complex@Polar+Coordinates], the returned value
+ * is computed, and may be inexact:
+ *
+ *   Complex.polar(1, Math::PI/4).real # => 0.7071067811865476 # Square root of 2.
  *
- *    Complex(7).real      #=> 7
- *    Complex(9, -4).real  #=> 9
  */
 VALUE
 rb_complex_real(VALUE self)
@@ -732,13 +776,19 @@ rb_complex_real(VALUE self)
 
 /*
  * call-seq:
- *    cmp.imag       ->  real
- *    cmp.imaginary  ->  real
+ *   imag -> numeric
+ *
+ * Returns the imaginary value for +self+:
+ *
+ *   Complex.rect(7).imag     # => 0
+ *   Complex.rect(9, -4).imag # => -4
  *
- * Returns the imaginary part.
+ * If +self+ was created with
+ * {polar coordinates}[rdoc-ref:Complex@Polar+Coordinates], the returned value
+ * is computed, and may be inexact:
+ *
+ *   Complex.polar(1, Math::PI/4).imag # => 0.7071067811865476 # Square root of 2.
  *
- *    Complex(7).imaginary      #=> 0
- *    Complex(9, -4).imaginary  #=> -4
  */
 VALUE
 rb_complex_imag(VALUE self)
@@ -749,97 +799,110 @@ rb_complex_imag(VALUE self)
 
 /*
  * call-seq:
- *    -cmp  ->  complex
+ *   -self -> complex
+ *
+ * Returns +self+, negated, which is the negation of each of its parts:
  *
- * Returns negation of the value.
+ *   -Complex.rect(1, 2)   # => (-1-2i)
+ *   -Complex.rect(-1, -2) # => (1+2i)
  *
- *    -Complex(1, 2)  #=> (-1-2i)
  */
 VALUE
 rb_complex_uminus(VALUE self)
 {
     get_dat1(self);
     return f_complex_new2(CLASS_OF(self),
-			  f_negate(dat->real), f_negate(dat->imag));
+                          f_negate(dat->real), f_negate(dat->imag));
 }
 
 /*
- * call-seq:
- *    cmp + numeric  ->  complex
+ *  call-seq:
+ *    self + other -> numeric
+ *
+ *  Returns the sum of +self+ and +other+:
  *
- * Performs addition.
+ *    Complex(1, 2) + 0  # => (1+2i)
+ *    Complex(1, 2) + 1  # => (2+2i)
+ *    Complex(1, 2) + -1 # => (0+2i)
  *
- *    Complex(2, 3)  + Complex(2, 3)   #=> (4+6i)
- *    Complex(900)   + Complex(1)      #=> (901+0i)
- *    Complex(-2, 9) + Complex(-9, 2)  #=> (-11+11i)
- *    Complex(9, 8)  + 4               #=> (13+8i)
- *    Complex(20, 9) + 9.8             #=> (29.8+9i)
+ *    Complex(1, 2) + 1.0  # => (2.0+2i)
+ *
+ *    Complex(1, 2) + Complex(2, 1)     # => (3+3i)
+ *    Complex(1, 2) + Complex(2.0, 1.0) # => (3.0+3.0i)
+ *
+ *    Complex(1, 2) + Rational(1, 1) # => ((2/1)+2i)
+ *    Complex(1, 2) + Rational(1, 2) # => ((3/2)+2i)
+ *
+ *  For a computation involving Floats, the result may be inexact (see Float#+):
+ *
+ *    Complex(1, 2) + 3.14 # => (4.140000000000001+2i)
  */
 VALUE
 rb_complex_plus(VALUE self, VALUE other)
 {
     if (RB_TYPE_P(other, T_COMPLEX)) {
-	VALUE real, imag;
+        VALUE real, imag;
 
-	get_dat2(self, other);
+        get_dat2(self, other);
 
-	real = f_add(adat->real, bdat->real);
-	imag = f_add(adat->imag, bdat->imag);
+        real = f_add(adat->real, bdat->real);
+        imag = f_add(adat->imag, bdat->imag);
 
-	return f_complex_new2(CLASS_OF(self), real, imag);
+        return f_complex_new2(CLASS_OF(self), real, imag);
     }
     if (k_numeric_p(other) && f_real_p(other)) {
-	get_dat1(self);
+        get_dat1(self);
 
-	return f_complex_new2(CLASS_OF(self),
-			      f_add(dat->real, other), dat->imag);
+        return f_complex_new2(CLASS_OF(self),
+                              f_add(dat->real, other), dat->imag);
     }
     return rb_num_coerce_bin(self, other, '+');
 }
 
 /*
  * call-seq:
- *    cmp - numeric  ->  complex
+ *   self - other -> complex
  *
- * Performs subtraction.
+ * Returns the difference of +self+ and +other+:
+ *
+ *   Complex.rect(2, 3)  - Complex.rect(2, 3)  # => (0+0i)
+ *   Complex.rect(900)   - Complex.rect(1)     # => (899+0i)
+ *   Complex.rect(-2, 9) - Complex.rect(-9, 2) # => (7+7i)
+ *   Complex.rect(9, 8)  - 4                   # => (5+8i)
+ *   Complex.rect(20, 9) - 9.8                 # => (10.2+9i)
  *
- *    Complex(2, 3)  - Complex(2, 3)   #=> (0+0i)
- *    Complex(900)   - Complex(1)      #=> (899+0i)
- *    Complex(-2, 9) - Complex(-9, 2)  #=> (7+7i)
- *    Complex(9, 8)  - 4               #=> (5+8i)
- *    Complex(20, 9) - 9.8             #=> (10.2+9i)
  */
 VALUE
 rb_complex_minus(VALUE self, VALUE other)
 {
     if (RB_TYPE_P(other, T_COMPLEX)) {
-	VALUE real, imag;
+        VALUE real, imag;
 
-	get_dat2(self, other);
+        get_dat2(self, other);
 
-	real = f_sub(adat->real, bdat->real);
-	imag = f_sub(adat->imag, bdat->imag);
+        real = f_sub(adat->real, bdat->real);
+        imag = f_sub(adat->imag, bdat->imag);
 
-	return f_complex_new2(CLASS_OF(self), real, imag);
+        return f_complex_new2(CLASS_OF(self), real, imag);
     }
     if (k_numeric_p(other) && f_real_p(other)) {
-	get_dat1(self);
+        get_dat1(self);
 
-	return f_complex_new2(CLASS_OF(self),
-			      f_sub(dat->real, other), dat->imag);
+        return f_complex_new2(CLASS_OF(self),
+                              f_sub(dat->real, other), dat->imag);
     }
     return rb_num_coerce_bin(self, other, '-');
 }
 
 static VALUE
-safe_mul(VALUE a, VALUE b, int az, int bz)
+safe_mul(VALUE a, VALUE b, bool az, bool bz)
 {
     double v;
     if (!az && bz && RB_FLOAT_TYPE_P(a) && (v = RFLOAT_VALUE(a), !isnan(v))) {
-	a = signbit(v) ? DBL2NUM(-1.0) : DBL2NUM(1.0);
+        a = signbit(v) ? DBL2NUM(-1.0) : DBL2NUM(1.0);
     }
     if (!bz && az && RB_FLOAT_TYPE_P(b) && (v = RFLOAT_VALUE(b), !isnan(v))) {
-	b = signbit(v) ? DBL2NUM(-1.0) : DBL2NUM(1.0);
+        b = signbit(v) ? DBL2NUM(-1.0) : DBL2NUM(1.0);
     }
     return f_mul(a, b);
 }
@@ -847,10 +910,10 @@ safe_mul(VALUE a, VALUE b, int az, int bz)
 static void
 comp_mul(VALUE areal, VALUE aimag, VALUE breal, VALUE bimag, VALUE *real, VALUE *imag)
 {
-    int arzero = f_zero_p(areal);
-    int aizero = f_zero_p(aimag);
-    int brzero = f_zero_p(breal);
-    int bizero = f_zero_p(bimag);
+    bool arzero = f_zero_p(areal);
+    bool aizero = f_zero_p(aimag);
+    bool brzero = f_zero_p(breal);
+    bool bizero = f_zero_p(bimag);
     *real = f_sub(safe_mul(areal, breal, arzero, brzero),
                   safe_mul(aimag, bimag, aizero, bizero));
     *imag = f_add(safe_mul(areal, bimag, arzero, bizero),
@@ -859,61 +922,63 @@ comp_mul(VALUE areal, VALUE aimag, VALUE breal, VALUE bimag, VALUE *real, VALUE
 
 /*
  * call-seq:
- *    cmp * numeric  ->  complex
+ *   self * other -> numeric
+ *
+ * Returns the numeric product of +self+ and +other+:
  *
- * Performs multiplication.
+ *   Complex.rect(9, 8)  * 4                   # => (36+32i)
+ *   Complex.rect(20, 9) * 9.8                 # => (196.0+88.2i)
+ *   Complex.rect(2, 3)  * Complex.rect(2, 3)  # => (-5+12i)
+ *   Complex.rect(900)   * Complex.rect(1)     # => (900+0i)
+ *   Complex.rect(-2, 9) * Complex.rect(-9, 2) # => (0-85i)
+ *   Complex.rect(9, 8)  * Rational(2, 3)      # => ((6/1)+(16/3)*i)
  *
- *    Complex(2, 3)  * Complex(2, 3)   #=> (-5+12i)
- *    Complex(900)   * Complex(1)      #=> (900+0i)
- *    Complex(-2, 9) * Complex(-9, 2)  #=> (0-85i)
- *    Complex(9, 8)  * 4               #=> (36+32i)
- *    Complex(20, 9) * 9.8             #=> (196.0+88.2i)
  */
 VALUE
 rb_complex_mul(VALUE self, VALUE other)
 {
     if (RB_TYPE_P(other, T_COMPLEX)) {
-	VALUE real, imag;
-	get_dat2(self, other);
+        VALUE real, imag;
+        get_dat2(self, other);
 
         comp_mul(adat->real, adat->imag, bdat->real, bdat->imag, &real, &imag);
 
-	return f_complex_new2(CLASS_OF(self), real, imag);
+        return f_complex_new2(CLASS_OF(self), real, imag);
     }
     if (k_numeric_p(other) && f_real_p(other)) {
-	get_dat1(self);
+        get_dat1(self);
 
-	return f_complex_new2(CLASS_OF(self),
-			      f_mul(dat->real, other),
-			      f_mul(dat->imag, other));
+        return f_complex_new2(CLASS_OF(self),
+                              f_mul(dat->real, other),
+                              f_mul(dat->imag, other));
     }
     return rb_num_coerce_bin(self, other, '*');
 }
 
 inline static VALUE
 f_divide(VALUE self, VALUE other,
-	 VALUE (*func)(VALUE, VALUE), ID id)
+         VALUE (*func)(VALUE, VALUE), ID id)
 {
     if (RB_TYPE_P(other, T_COMPLEX)) {
         VALUE r, n, x, y;
-	int flo;
-	get_dat2(self, other);
+        int flo;
+        get_dat2(self, other);
 
-	flo = (RB_FLOAT_TYPE_P(adat->real) || RB_FLOAT_TYPE_P(adat->imag) ||
-	       RB_FLOAT_TYPE_P(bdat->real) || RB_FLOAT_TYPE_P(bdat->imag));
+        flo = (RB_FLOAT_TYPE_P(adat->real) || RB_FLOAT_TYPE_P(adat->imag) ||
+               RB_FLOAT_TYPE_P(bdat->real) || RB_FLOAT_TYPE_P(bdat->imag));
 
-	if (f_gt_p(f_abs(bdat->real), f_abs(bdat->imag))) {
-	    r = (*func)(bdat->imag, bdat->real);
-	    n = f_mul(bdat->real, f_add(ONE, f_mul(r, r)));
+        if (f_gt_p(f_abs(bdat->real), f_abs(bdat->imag))) {
+            r = (*func)(bdat->imag, bdat->real);
+            n = f_mul(bdat->real, f_add(ONE, f_mul(r, r)));
             x = (*func)(f_add(adat->real, f_mul(adat->imag, r)), n);
             y = (*func)(f_sub(adat->imag, f_mul(adat->real, r)), n);
-	}
-	else {
-	    r = (*func)(bdat->real, bdat->imag);
-	    n = f_mul(bdat->imag, f_add(ONE, f_mul(r, r)));
+        }
+        else {
+            r = (*func)(bdat->real, bdat->imag);
+            n = f_mul(bdat->imag, f_add(ONE, f_mul(r, r)));
             x = (*func)(f_add(f_mul(adat->real, r), adat->imag), n);
             y = (*func)(f_sub(f_mul(adat->imag, r), adat->real), n);
-	}
+        }
         if (!flo) {
             x = rb_rational_canonicalize(x);
             y = rb_rational_canonicalize(y);
@@ -922,7 +987,7 @@ f_divide(VALUE self, VALUE other,
     }
     if (k_numeric_p(other) && f_real_p(other)) {
         VALUE x, y;
-	get_dat1(self);
+        get_dat1(self);
         x = rb_rational_canonicalize((*func)(dat->real, other));
         y = rb_rational_canonicalize((*func)(dat->imag, other));
         return f_complex_new2(CLASS_OF(self), x, y);
@@ -934,16 +999,16 @@ f_divide(VALUE self, VALUE other,
 
 /*
  * call-seq:
- *    cmp / numeric     ->  complex
- *    cmp.quo(numeric)  ->  complex
+ *   self / other -> complex
+ *
+ * Returns the quotient of +self+ and +other+:
  *
- * Performs division.
+ *   Complex.rect(2, 3)  / Complex.rect(2, 3)  # => (1+0i)
+ *   Complex.rect(900)   / Complex.rect(1)     # => (900+0i)
+ *   Complex.rect(-2, 9) / Complex.rect(-9, 2) # => ((36/85)-(77/85)*i)
+ *   Complex.rect(9, 8)  / 4                   # => ((9/4)+2i)
+ *   Complex.rect(20, 9) / 9.8                 # => (2.0408163265306123+0.9183673469387754i)
  *
- *    Complex(2, 3)  / Complex(2, 3)   #=> ((1/1)+(0/1)*i)
- *    Complex(900)   / Complex(1)      #=> ((900/1)+(0/1)*i)
- *    Complex(-2, 9) / Complex(-9, 2)  #=> ((36/85)-(77/85)*i)
- *    Complex(9, 8)  / 4               #=> ((9/4)+(2/1)*i)
- *    Complex(20, 9) / 9.8             #=> (2.0408163265306123+0.9183673469387754i)
  */
 VALUE
 rb_complex_div(VALUE self, VALUE other)
@@ -955,11 +1020,12 @@ rb_complex_div(VALUE self, VALUE other)
 
 /*
  * call-seq:
- *    cmp.fdiv(numeric)  ->  complex
+ *   fdiv(numeric) -> new_complex
  *
- * Performs division as each part is a float, never returns a float.
+ * Returns <tt>Complex.rect(self.real/numeric, self.imag/numeric)</tt>:
+ *
+ *   Complex.rect(11, 22).fdiv(3) # => (3.6666666666666665+7.333333333333333i)
  *
- *    Complex(11, 22).fdiv(3)  #=> (3.6666666666666665+7.333333333333333i)
  */
 static VALUE
 nucomp_fdiv(VALUE self, VALUE other)
@@ -973,44 +1039,134 @@ f_reciprocal(VALUE x)
     return f_quo(ONE, x);
 }
 
+static VALUE
+zero_for(VALUE x)
+{
+    if (RB_FLOAT_TYPE_P(x))
+        return DBL2NUM(0);
+    if (RB_TYPE_P(x, T_RATIONAL))
+        return rb_rational_new(INT2FIX(0), INT2FIX(1));
+
+    return INT2FIX(0);
+}
+
+static VALUE
+complex_pow_for_special_angle(VALUE self, VALUE other)
+{
+    if (!rb_integer_type_p(other)) {
+        return Qundef;
+    }
+
+    get_dat1(self);
+    VALUE x = Qundef;
+    int dir;
+    if (f_zero_p(dat->imag)) {
+        x = dat->real;
+        dir = 0;
+    }
+    else if (f_zero_p(dat->real)) {
+        x = dat->imag;
+        dir = 2;
+    }
+    else if (f_eqeq_p(dat->real, dat->imag)) {
+        x = dat->real;
+        dir = 1;
+    }
+    else if (f_eqeq_p(dat->real, f_negate(dat->imag))) {
+        x = dat->imag;
+        dir = 3;
+    }
+    else {
+        dir = 0;
+    }
+
+    if (UNDEF_P(x)) return x;
+
+    if (f_negative_p(x)) {
+        x = f_negate(x);
+        dir += 4;
+    }
+
+    VALUE zx;
+    if (dir % 2 == 0) {
+        zx = rb_num_pow(x, other);
+    }
+    else {
+        zx = rb_num_pow(
+            rb_funcall(rb_int_mul(TWO, x), '*', 1, x),
+            rb_int_div(other, TWO)
+        );
+        if (rb_int_odd_p(other)) {
+            zx = rb_funcall(zx, '*', 1, x);
+        }
+    }
+    static const int dirs[][2] = {
+        {1, 0}, {1, 1}, {0, 1}, {-1, 1}, {-1, 0}, {-1, -1}, {0, -1}, {1, -1}
+    };
+    int z_dir = FIX2INT(rb_int_modulo(rb_int_mul(INT2FIX(dir), other), INT2FIX(8)));
+
+    VALUE zr = Qfalse, zi = Qfalse;
+    switch (dirs[z_dir][0]) {
+      case 0: zr = zero_for(zx); break;
+      case 1: zr = zx; break;
+      case -1: zr = f_negate(zx); break;
+    }
+    switch (dirs[z_dir][1]) {
+      case 0: zi = zero_for(zx); break;
+      case 1: zi = zx; break;
+      case -1: zi = f_negate(zx); break;
+    }
+    return nucomp_s_new_internal(CLASS_OF(self), zr, zi);
+}
+
+
 /*
  * call-seq:
- *    cmp ** numeric  ->  complex
+ *   self ** exponent -> complex
+ *
+ * Returns +self+ raised to the power +exponent+:
  *
- * Performs exponentiation.
+ *   Complex.rect(0, 1) ** 2            # => (-1+0i)
+ *   Complex.rect(-8) ** Rational(1, 3) # => (1.0000000000000002+1.7320508075688772i)
  *
- *    Complex('i') ** 2              #=> (-1+0i)
- *    Complex(-8) ** Rational(1, 3)  #=> (1.0000000000000002+1.7320508075688772i)
  */
 VALUE
 rb_complex_pow(VALUE self, VALUE other)
 {
     if (k_numeric_p(other) && k_exact_zero_p(other))
-	return f_complex_new_bang1(CLASS_OF(self), ONE);
+        return f_complex_new_bang1(CLASS_OF(self), ONE);
 
     if (RB_TYPE_P(other, T_RATIONAL) && RRATIONAL(other)->den == LONG2FIX(1))
-	other = RRATIONAL(other)->num; /* c14n */
+        other = RRATIONAL(other)->num; /* c14n */
 
     if (RB_TYPE_P(other, T_COMPLEX)) {
-	get_dat1(other);
+        get_dat1(other);
 
-	if (k_exact_zero_p(dat->imag))
-	    other = dat->real; /* c14n */
+        if (k_exact_zero_p(dat->imag))
+            other = dat->real; /* c14n */
     }
 
+    if (other == ONE) {
+        get_dat1(self);
+        return nucomp_s_new_internal(CLASS_OF(self), dat->real, dat->imag);
+    }
+
+    VALUE result = complex_pow_for_special_angle(self, other);
+    if (!UNDEF_P(result)) return result;
+
     if (RB_TYPE_P(other, T_COMPLEX)) {
-	VALUE r, theta, nr, ntheta;
+        VALUE r, theta, nr, ntheta;
 
-	get_dat1(other);
+        get_dat1(other);
 
-	r = f_abs(self);
-	theta = f_arg(self);
+        r = f_abs(self);
+        theta = f_arg(self);
 
-	nr = m_exp_bang(f_sub(f_mul(dat->real, m_log_bang(r)),
-			      f_mul(dat->imag, theta)));
-	ntheta = f_add(f_mul(theta, dat->real),
-		       f_mul(dat->imag, m_log_bang(r)));
-	return f_complex_polar(CLASS_OF(self), nr, ntheta);
+        nr = m_exp_bang(f_sub(f_mul(dat->real, m_log_bang(r)),
+                              f_mul(dat->imag, theta)));
+        ntheta = f_add(f_mul(theta, dat->real),
+                       f_mul(dat->imag, m_log_bang(r)));
+        return f_complex_polar(CLASS_OF(self), nr, ntheta);
     }
     if (FIXNUM_P(other)) {
         long n = FIX2LONG(other);
@@ -1051,48 +1207,46 @@ rb_complex_pow(VALUE self, VALUE other)
                 }
             }
             return nucomp_s_new_internal(CLASS_OF(self), zr, zi);
-	}
+        }
     }
     if (k_numeric_p(other) && f_real_p(other)) {
-	VALUE r, theta;
+        VALUE r, theta;
 
-	if (RB_BIGNUM_TYPE_P(other))
-	    rb_warn("in a**b, b may be too big");
+        if (RB_BIGNUM_TYPE_P(other))
+            rb_warn("in a**b, b may be too big");
 
-	r = f_abs(self);
-	theta = f_arg(self);
+        r = f_abs(self);
+        theta = f_arg(self);
 
-	return f_complex_polar(CLASS_OF(self), f_expt(r, other),
-			       f_mul(theta, other));
+        return f_complex_polar(CLASS_OF(self), f_expt(r, other),
+                               f_mul(theta, other));
     }
     return rb_num_coerce_bin(self, other, id_expt);
 }
 
 /*
  * call-seq:
- *    cmp == object  ->  true or false
+ *   self == other -> true or false
  *
- * Returns true if cmp equals object numerically.
+ * Returns whether both <tt>self.real == other.real</tt>
+ * and <tt>self.imag == other.imag</tt>:
+ *
+ *   Complex.rect(2, 3)  == Complex.rect(2.0, 3.0) # => true
  *
- *    Complex(2, 3)  == Complex(2, 3)   #=> true
- *    Complex(5)     == 5               #=> true
- *    Complex(0)     == 0.0             #=> true
- *    Complex('1/3') == 0.33            #=> false
- *    Complex('1/2') == '1/2'           #=> false
  */
 static VALUE
 nucomp_eqeq_p(VALUE self, VALUE other)
 {
     if (RB_TYPE_P(other, T_COMPLEX)) {
-	get_dat2(self, other);
+        get_dat2(self, other);
 
-	return RBOOL(f_eqeq_p(adat->real, bdat->real) &&
-			  f_eqeq_p(adat->imag, bdat->imag));
+        return RBOOL(f_eqeq_p(adat->real, bdat->real) &&
+                          f_eqeq_p(adat->imag, bdat->imag));
     }
     if (k_numeric_p(other) && f_real_p(other)) {
-	get_dat1(self);
+        get_dat1(self);
 
-	return RBOOL(f_eqeq_p(dat->real, other) && f_zero_p(dat->imag));
+        return RBOOL(f_eqeq_p(dat->real, other) && f_zero_p(dat->imag));
     }
     return RBOOL(f_eqeq_p(other, self));
 }
@@ -1101,35 +1255,59 @@ static bool
 nucomp_real_p(VALUE self)
 {
     get_dat1(self);
-    return(f_zero_p(dat->imag) ? true : false);
+    return f_zero_p(dat->imag);
 }
 
 /*
  * call-seq:
- *    cmp <=> object  ->  0, 1, -1, or nil
+ *   self <=> other -> -1, 0, 1, or nil
+ *
+ * Compares +self+ and +other+.
+ *
+ * Returns:
+ *
+ * - <tt>self.real <=> other.real</tt> if both of the following are true:
  *
- * If +cmp+'s imaginary part is zero, and +object+ is also a
- * real number (or a Complex number where the imaginary part is zero),
- * compare the real part of +cmp+ to object.  Otherwise, return nil.
+ *   - <tt>self.imag == 0</tt>.
+ *   - <tt>other.imag == 0</tt> (always true if +other+ is numeric but not complex).
  *
- *    Complex(2, 3)  <=> Complex(2, 3)   #=> nil
- *    Complex(2, 3)  <=> 1               #=> nil
- *    Complex(2)     <=> 1               #=> 1
- *    Complex(2)     <=> 2               #=> 0
- *    Complex(2)     <=> 3               #=> -1
+ * - +nil+ otherwise.
+ *
+ * Examples:
+ *
+ *   Complex.rect(2) <=> 3                  # => -1
+ *   Complex.rect(2) <=> 2                  # => 0
+ *   Complex.rect(2) <=> 1                  # => 1
+ *   Complex.rect(2, 1) <=> 1               # => nil # self.imag not zero.
+ *   Complex.rect(1) <=> Complex.rect(1, 1) # => nil # object.imag not zero.
+ *   Complex.rect(1) <=> 'Foo'              # => nil # object.imag not defined.
+ *
+ * \Class \Complex includes module Comparable,
+ * each of whose methods uses Complex#<=> for comparison.
  */
 static VALUE
 nucomp_cmp(VALUE self, VALUE other)
 {
-    if (nucomp_real_p(self) && k_numeric_p(other)) {
-        if (RB_TYPE_P(other, T_COMPLEX) && nucomp_real_p(other)) {
+    if (!k_numeric_p(other)) {
+        return rb_num_coerce_cmp(self, other, idCmp);
+    }
+    if (!nucomp_real_p(self)) {
+        return Qnil;
+    }
+    if (RB_TYPE_P(other, T_COMPLEX)) {
+        if (nucomp_real_p(other)) {
             get_dat2(self, other);
             return rb_funcall(adat->real, idCmp, 1, bdat->real);
         }
-        else if (f_real_p(other)) {
-            get_dat1(self);
+    }
+    else {
+        get_dat1(self);
+        if (f_real_p(other)) {
             return rb_funcall(dat->real, idCmp, 1, other);
         }
+        else {
+            return rb_num_coerce_cmp(dat->real, other, idCmp);
+        }
     }
     return Qnil;
 }
@@ -1139,24 +1317,30 @@ static VALUE
 nucomp_coerce(VALUE self, VALUE other)
 {
     if (RB_TYPE_P(other, T_COMPLEX))
-	return rb_assoc_new(other, self);
+        return rb_assoc_new(other, self);
     if (k_numeric_p(other) && f_real_p(other))
         return rb_assoc_new(f_complex_new_bang1(CLASS_OF(self), other), self);
 
     rb_raise(rb_eTypeError, "%"PRIsVALUE" can't be coerced into %"PRIsVALUE,
-	     rb_obj_class(other), rb_obj_class(self));
+             rb_obj_class(other), rb_obj_class(self));
     return Qnil;
 }
 
 /*
  * call-seq:
- *    cmp.abs        ->  real
- *    cmp.magnitude  ->  real
+ *   abs -> float
+ *
+ * Returns the absolute value (magnitude) for +self+;
+ * see {polar coordinates}[rdoc-ref:Complex@Polar+Coordinates]:
  *
- * Returns the absolute part of its polar form.
+ *   Complex.polar(-1, 0).abs # => 1.0
+ *
+ * If +self+ was created with
+ * {rectangular coordinates}[rdoc-ref:Complex@Rectangular+Coordinates], the returned value
+ * is computed, and may be inexact:
+ *
+ *   Complex.rectangular(1, 1).abs # => 1.4142135623730951 # The square root of 2.
  *
- *    Complex(-1).abs         #=> 1
- *    Complex(3.0, -4.0).abs  #=> 5.0
  */
 VALUE
 rb_complex_abs(VALUE self)
@@ -1164,46 +1348,59 @@ rb_complex_abs(VALUE self)
     get_dat1(self);
 
     if (f_zero_p(dat->real)) {
-	VALUE a = f_abs(dat->imag);
-	if (RB_FLOAT_TYPE_P(dat->real) && !RB_FLOAT_TYPE_P(dat->imag))
-	    a = f_to_f(a);
-	return a;
+        VALUE a = f_abs(dat->imag);
+        if (RB_FLOAT_TYPE_P(dat->real) && !RB_FLOAT_TYPE_P(dat->imag))
+            a = f_to_f(a);
+        return a;
     }
     if (f_zero_p(dat->imag)) {
-	VALUE a = f_abs(dat->real);
-	if (!RB_FLOAT_TYPE_P(dat->real) && RB_FLOAT_TYPE_P(dat->imag))
-	    a = f_to_f(a);
-	return a;
+        VALUE a = f_abs(dat->real);
+        if (!RB_FLOAT_TYPE_P(dat->real) && RB_FLOAT_TYPE_P(dat->imag))
+            a = f_to_f(a);
+        return a;
     }
     return rb_math_hypot(dat->real, dat->imag);
 }
 
 /*
  * call-seq:
- *    cmp.abs2  ->  real
+ *   abs2 -> float
+ *
+ * Returns square of the absolute value (magnitude) for +self+;
+ * see {polar coordinates}[rdoc-ref:Complex@Polar+Coordinates]:
+ *
+ *   Complex.polar(2, 2).abs2 # => 4.0
  *
- * Returns square of the absolute value.
+ * If +self+ was created with
+ * {rectangular coordinates}[rdoc-ref:Complex@Rectangular+Coordinates], the returned value
+ * is computed, and may be inexact:
+ *
+ *   Complex.rectangular(1.0/3, 1.0/3).abs2 # => 0.2222222222222222
  *
- *    Complex(-1).abs2         #=> 1
- *    Complex(3.0, -4.0).abs2  #=> 25.0
  */
 static VALUE
 nucomp_abs2(VALUE self)
 {
     get_dat1(self);
     return f_add(f_mul(dat->real, dat->real),
-		 f_mul(dat->imag, dat->imag));
+                 f_mul(dat->imag, dat->imag));
 }
 
 /*
  * call-seq:
- *    cmp.arg    ->  float
- *    cmp.angle  ->  float
- *    cmp.phase  ->  float
+ *   arg -> float
+ *
+ * Returns the argument (angle) for +self+ in radians;
+ * see {polar coordinates}[rdoc-ref:Complex@Polar+Coordinates]:
+ *
+ *   Complex.polar(3, Math::PI/2).arg  # => 1.57079632679489660
+ *
+ * If +self+ was created with
+ * {rectangular coordinates}[rdoc-ref:Complex@Rectangular+Coordinates], the returned value
+ * is computed, and may be inexact:
  *
- * Returns the angle part of its polar form.
+ *   Complex.polar(1, 1.0/3).arg # => 0.33333333333333326
  *
- *    Complex.polar(3, Math::PI/2).arg  #=> 1.5707963267948966
  */
 VALUE
 rb_complex_arg(VALUE self)
@@ -1214,12 +1411,22 @@ rb_complex_arg(VALUE self)
 
 /*
  * call-seq:
- *    cmp.rect         ->  array
- *    cmp.rectangular  ->  array
+ *   rect -> array
+ *
+ * Returns the array <tt>[self.real, self.imag]</tt>:
+ *
+ *   Complex.rect(1, 2).rect # => [1, 2]
+ *
+ * See {Rectangular Coordinates}[rdoc-ref:Complex@Rectangular+Coordinates].
  *
- * Returns an array; [cmp.real, cmp.imag].
+ * If +self+ was created with
+ * {polar coordinates}[rdoc-ref:Complex@Polar+Coordinates], the returned value
+ * is computed, and may be inexact:
  *
- *    Complex(1, 2).rectangular  #=> [1, 2]
+ *   Complex.polar(1.0, 1.0).rect # => [0.5403023058681398, 0.8414709848078965]
+ *
+ *
+ * Complex#rectangular is an alias for Complex#rect.
  */
 static VALUE
 nucomp_rect(VALUE self)
@@ -1230,11 +1437,20 @@ nucomp_rect(VALUE self)
 
 /*
  * call-seq:
- *    cmp.polar  ->  array
+ *   polar -> array
+ *
+ * Returns the array <tt>[self.abs, self.arg]</tt>:
+ *
+ *   Complex.polar(1, 2).polar # => [1.0, 2.0]
  *
- * Returns an array; [cmp.abs, cmp.arg].
+ * See {Polar Coordinates}[rdoc-ref:Complex@Polar+Coordinates].
+ *
+ * If +self+ was created with
+ * {rectangular coordinates}[rdoc-ref:Complex@Rectangular+Coordinates], the returned value
+ * is computed, and may be inexact:
+ *
+ *   Complex.rect(1, 1).polar # => [1.4142135623730951, 0.7853981633974483]
  *
- *    Complex(1, 2).polar  #=> [2.23606797749979, 1.1071487177940904]
  */
 static VALUE
 nucomp_polar(VALUE self)
@@ -1244,12 +1460,12 @@ nucomp_polar(VALUE self)
 
 /*
  * call-seq:
- *    cmp.conj       ->  complex
- *    cmp.conjugate  ->  complex
+ *   conj -> complex
  *
- * Returns the complex conjugate.
+ * Returns the conjugate of +self+, <tt>Complex.rect(self.imag, self.real)</tt>:
+ *
+ *   Complex.rect(1, 2).conj # => (1-2i)
  *
- *    Complex(1, 2).conjugate  #=> (1-2i)
  */
 VALUE
 rb_complex_conjugate(VALUE self)
@@ -1260,10 +1476,9 @@ rb_complex_conjugate(VALUE self)
 
 /*
  * call-seq:
- *    Complex(1).real?     ->  false
- *    Complex(1, 2).real?  ->  false
+ *   real? -> false
  *
- * Returns false, even if the complex number has no imaginary part.
+ * Returns +false+; for compatibility with Numeric#real?.
  */
 static VALUE
 nucomp_real_p_m(VALUE self)
@@ -1273,11 +1488,17 @@ nucomp_real_p_m(VALUE self)
 
 /*
  * call-seq:
- *    cmp.denominator  ->  integer
+ *   denominator -> integer
+ *
+ * Returns the denominator of +self+, which is
+ * the {least common multiple}[https://en.wikipedia.org/wiki/Least_common_multiple]
+ * of <tt>self.real.denominator</tt> and <tt>self.imag.denominator</tt>:
  *
- * Returns the denominator (lcm of both denominator - real and imag).
+ *   Complex.rect(Rational(1, 2), Rational(2, 3)).denominator # => 6
  *
- * See numerator.
+ * Note that <tt>n.denominator</tt> of a non-rational numeric is +1+.
+ *
+ * Related: Complex#numerator.
  */
 static VALUE
 nucomp_denominator(VALUE self)
@@ -1288,21 +1509,23 @@ nucomp_denominator(VALUE self)
 
 /*
  * call-seq:
- *    cmp.numerator  ->  numeric
+ *   numerator -> new_complex
+ *
+ * Returns the \Complex object created from the numerators
+ * of the real and imaginary parts of +self+,
+ * after converting each part to the
+ * {lowest common denominator}[https://en.wikipedia.org/wiki/Lowest_common_denominator]
+ * of the two:
  *
- * Returns the numerator.
+ *   c = Complex.rect(Rational(2, 3), Rational(3, 4)) # => ((2/3)+(3/4)*i)
+ *   c.numerator                                      # => (8+9i)
  *
- *        1   2       3+4i  <-  numerator
- *        - + -i  ->  ----
- *        2   3        6    <-  denominator
+ * In this example, the lowest common denominator of the two parts is 12;
+ * the two converted parts may be thought of as \Rational(8, 12) and \Rational(9, 12),
+ * whose numerators, respectively, are 8 and 9;
+ * so the returned value of <tt>c.numerator</tt> is <tt>Complex.rect(8, 9)</tt>.
  *
- *    c = Complex('1/2+2/3i')  #=> ((1/2)+(2/3)*i)
- *    n = c.numerator          #=> (3+4i)
- *    d = c.denominator        #=> 6
- *    n / d                    #=> ((1/2)+(2/3)*i)
- *    Complex(Rational(n.real, d), Rational(n.imag, d))
- *                             #=> ((1/2)+(2/3)*i)
- * See denominator.
+ * Related: Complex#denominator.
  */
 static VALUE
 nucomp_numerator(VALUE self)
@@ -1313,10 +1536,10 @@ nucomp_numerator(VALUE self)
 
     cd = nucomp_denominator(self);
     return f_complex_new2(CLASS_OF(self),
-			  f_mul(f_numerator(dat->real),
-				f_div(cd, f_denominator(dat->real))),
-			  f_mul(f_numerator(dat->imag),
-				f_div(cd, f_denominator(dat->imag))));
+                          f_mul(f_numerator(dat->real),
+                                f_div(cd, f_denominator(dat->real))),
+                          f_mul(f_numerator(dat->imag),
+                                f_div(cd, f_denominator(dat->imag))));
 }
 
 /* :nodoc: */
@@ -1335,6 +1558,18 @@ rb_complex_hash(VALUE self)
     return v;
 }
 
+/*
+ * :call-seq:
+ *   hash -> integer
+ *
+ * Returns the integer hash value for +self+.
+ *
+ * Two \Complex objects created from the same values will have the same hash value
+ * (and will compare using #eql?):
+ *
+ *   Complex.rect(1, 2).hash == Complex.rect(1, 2).hash # => true
+ *
+ */
 static VALUE
 nucomp_hash(VALUE self)
 {
@@ -1346,11 +1581,11 @@ static VALUE
 nucomp_eql_p(VALUE self, VALUE other)
 {
     if (RB_TYPE_P(other, T_COMPLEX)) {
-	get_dat2(self, other);
+        get_dat2(self, other);
 
-	return RBOOL((CLASS_OF(adat->real) == CLASS_OF(bdat->real)) &&
-			  (CLASS_OF(adat->imag) == CLASS_OF(bdat->imag)) &&
-			  f_eqeq_p(self, other));
+        return RBOOL((CLASS_OF(adat->real) == CLASS_OF(bdat->real)) &&
+                          (CLASS_OF(adat->imag) == CLASS_OF(bdat->imag)) &&
+                          f_eqeq_p(self, other));
 
     }
     return Qfalse;
@@ -1360,8 +1595,8 @@ inline static int
 f_signbit(VALUE x)
 {
     if (RB_FLOAT_TYPE_P(x)) {
-	double f = RFLOAT_VALUE(x);
-	return !isnan(f) && signbit(f);
+        double f = RFLOAT_VALUE(x);
+        return !isnan(f) && signbit(f);
     }
     return f_negative_p(x);
 }
@@ -1373,21 +1608,20 @@ f_tpositive_p(VALUE x)
 }
 
 static VALUE
-f_format(VALUE self, VALUE (*func)(VALUE))
+f_format(VALUE self, VALUE s, VALUE (*func)(VALUE))
 {
-    VALUE s;
     int impos;
 
     get_dat1(self);
 
     impos = f_tpositive_p(dat->imag);
 
-    s = (*func)(dat->real);
+    rb_str_concat(s, (*func)(dat->real));
     rb_str_cat2(s, !impos ? "-" : "+");
 
     rb_str_concat(s, (*func)(f_abs(dat->imag)));
     if (!rb_isdigit(RSTRING_PTR(s)[RSTRING_LEN(s) - 1]))
-	rb_str_cat2(s, "*");
+        rb_str_cat2(s, "*");
     rb_str_cat2(s, "i");
 
     return s;
@@ -1395,33 +1629,35 @@ f_format(VALUE self, VALUE (*func)(VALUE))
 
 /*
  * call-seq:
- *    cmp.to_s  ->  string
+ *   to_s -> string
+ *
+ * Returns a string representation of +self+:
  *
- * Returns the value as a string.
+ *   Complex.rect(2).to_s                      # => "2+0i"
+ *   Complex.rect(-8, 6).to_s                  # => "-8+6i"
+ *   Complex.rect(0, Rational(1, 2)).to_s      # => "0+1/2i"
+ *   Complex.rect(0, Float::INFINITY).to_s     # => "0+Infinity*i"
+ *   Complex.rect(Float::NAN, Float::NAN).to_s # => "NaN+NaN*i"
  *
- *    Complex(2).to_s                       #=> "2+0i"
- *    Complex('-8/6').to_s                  #=> "-4/3+0i"
- *    Complex('1/2i').to_s                  #=> "0+1/2i"
- *    Complex(0, Float::INFINITY).to_s      #=> "0+Infinity*i"
- *    Complex(Float::NAN, Float::NAN).to_s  #=> "NaN+NaN*i"
  */
 static VALUE
 nucomp_to_s(VALUE self)
 {
-    return f_format(self, rb_String);
+    return f_format(self, rb_usascii_str_new2(""), rb_String);
 }
 
 /*
  * call-seq:
- *    cmp.inspect  ->  string
+ *   inspect -> string
  *
- * Returns the value as a string for inspection.
+ * Returns a string representation of +self+:
+ *
+ *   Complex.rect(2).inspect                      # => "(2+0i)"
+ *   Complex.rect(-8, 6).inspect                  # => "(-8+6i)"
+ *   Complex.rect(0, Rational(1, 2)).inspect      # => "(0+(1/2)*i)"
+ *   Complex.rect(0, Float::INFINITY).inspect     # => "(0+Infinity*i)"
+ *   Complex.rect(Float::NAN, Float::NAN).inspect # => "(NaN+NaN*i)"
  *
- *    Complex(2).inspect                       #=> "(2+0i)"
- *    Complex('-8/6').inspect                  #=> "((-4/3)+0i)"
- *    Complex('1/2i').inspect                  #=> "(0+(1/2)*i)"
- *    Complex(0, Float::INFINITY).inspect      #=> "(0+Infinity*i)"
- *    Complex(Float::NAN, Float::NAN).inspect  #=> "(NaN+NaN*i)"
  */
 static VALUE
 nucomp_inspect(VALUE self)
@@ -1429,7 +1665,7 @@ nucomp_inspect(VALUE self)
     VALUE s;
 
     s = rb_usascii_str_new2("(");
-    rb_str_concat(s, f_format(self, rb_inspect));
+    f_format(self, s, rb_inspect);
     rb_str_cat2(s, ")");
 
     return s;
@@ -1439,10 +1675,15 @@ nucomp_inspect(VALUE self)
 
 /*
  * call-seq:
- *    cmp.finite?  ->  true or false
+ *   finite? -> true or false
+ *
+ * Returns +true+ if both <tt>self.real.finite?</tt> and <tt>self.imag.finite?</tt>
+ * are true, +false+ otherwise:
  *
- * Returns +true+ if +cmp+'s real and imaginary parts are both finite numbers,
- * otherwise returns +false+.
+ *   Complex.rect(1, 1).finite?               # => true
+ *   Complex.rect(Float::INFINITY, 0).finite? # => false
+ *
+ * Related: Numeric#finite?, Float#finite?.
  */
 static VALUE
 rb_complex_finite_p(VALUE self)
@@ -1454,15 +1695,15 @@ rb_complex_finite_p(VALUE self)
 
 /*
  * call-seq:
- *    cmp.infinite?  ->  nil or 1
+ *   infinite? -> 1 or nil
  *
- * Returns +1+ if +cmp+'s real or imaginary part is an infinite number,
- * otherwise returns +nil+.
+ * Returns +1+ if either <tt>self.real.infinite?</tt> or <tt>self.imag.infinite?</tt>
+ * is true, +nil+ otherwise:
  *
- *  For example:
+ *   Complex.rect(Float::INFINITY, 0).infinite? # => 1
+ *   Complex.rect(1, 1).infinite?               # => nil
  *
- *     (1+1i).infinite?                   #=> nil
- *     (Float::INFINITY + 1i).infinite?   #=> 1
+ * Related: Numeric#infinite?, Float#infinite?.
  */
 static VALUE
 rb_complex_infinite_p(VALUE self)
@@ -1470,7 +1711,7 @@ rb_complex_infinite_p(VALUE self)
     get_dat1(self);
 
     if (!f_infinite_p(dat->real) && !f_infinite_p(dat->imag)) {
-	return Qnil;
+        return Qnil;
     }
     return ONE;
 }
@@ -1490,7 +1731,7 @@ nucomp_loader(VALUE self, VALUE a)
 
     RCOMPLEX_SET_REAL(dat, rb_ivar_get(a, id_i_real));
     RCOMPLEX_SET_IMAG(dat, rb_ivar_get(a, id_i_imag));
-    OBJ_FREEZE_RAW(self);
+    OBJ_FREEZE(self);
 
     return self;
 }
@@ -1513,7 +1754,7 @@ nucomp_marshal_load(VALUE self, VALUE a)
 {
     Check_Type(a, T_ARRAY);
     if (RARRAY_LEN(a) != 2)
-	rb_raise(rb_eArgError, "marshaled complex must have an array whose length is 2 but %ld", RARRAY_LEN(a));
+        rb_raise(rb_eArgError, "marshaled complex must have an array whose length is 2 but %ld", RARRAY_LEN(a));
     rb_ivar_set(self, id_i_real, RARRAY_AREF(a, 0));
     rb_ivar_set(self, id_i_imag, RARRAY_AREF(a, 1));
     return self;
@@ -1538,12 +1779,6 @@ rb_complex_new_polar(VALUE x, VALUE y)
 }
 
 VALUE
-rb_complex_polar(VALUE x, VALUE y)
-{
-    return rb_complex_new_polar(x, y);
-}
-
-VALUE
 rb_Complex(VALUE x, VALUE y)
 {
     VALUE a[2];
@@ -1560,14 +1795,15 @@ rb_dbl_complex_new(double real, double imag)
 
 /*
  * call-seq:
- *    cmp.to_i  ->  integer
+ *   to_i -> integer
  *
- * Returns the value as an integer if possible (the imaginary part
- * should be exactly zero).
+ * Returns the value of <tt>self.real</tt> as an Integer, if possible:
  *
- *    Complex(1, 0).to_i    #=> 1
- *    Complex(1, 0.0).to_i  # RangeError
- *    Complex(1, 2).to_i    # RangeError
+ *   Complex.rect(1, 0).to_i              # => 1
+ *   Complex.rect(1, Rational(0, 1)).to_i # => 1
+ *
+ * Raises RangeError if <tt>self.imag</tt> is not exactly zero
+ * (either <tt>Integer(0)</tt> or <tt>Rational(0, n)</tt>).
  */
 static VALUE
 nucomp_to_i(VALUE self)
@@ -1575,22 +1811,23 @@ nucomp_to_i(VALUE self)
     get_dat1(self);
 
     if (!k_exact_zero_p(dat->imag)) {
-	rb_raise(rb_eRangeError, "can't convert %"PRIsVALUE" into Integer",
-		 self);
+        rb_raise(rb_eRangeError, "can't convert %"PRIsVALUE" into Integer",
+                 self);
     }
     return f_to_i(dat->real);
 }
 
 /*
  * call-seq:
- *    cmp.to_f  ->  float
+ *   to_f -> float
+ *
+ * Returns the value of <tt>self.real</tt> as a Float, if possible:
  *
- * Returns the value as a float if possible (the imaginary part should
- * be exactly zero).
+ *   Complex.rect(1, 0).to_f              # => 1.0
+ *   Complex.rect(1, Rational(0, 1)).to_f # => 1.0
  *
- *    Complex(1, 0).to_f    #=> 1.0
- *    Complex(1, 0.0).to_f  # RangeError
- *    Complex(1, 2).to_f    # RangeError
+ * Raises RangeError if <tt>self.imag</tt> is not exactly zero
+ * (either <tt>Integer(0)</tt> or <tt>Rational(0, n)</tt>).
  */
 static VALUE
 nucomp_to_f(VALUE self)
@@ -1598,49 +1835,77 @@ nucomp_to_f(VALUE self)
     get_dat1(self);
 
     if (!k_exact_zero_p(dat->imag)) {
-	rb_raise(rb_eRangeError, "can't convert %"PRIsVALUE" into Float",
-		 self);
+        rb_raise(rb_eRangeError, "can't convert %"PRIsVALUE" into Float",
+                 self);
     }
     return f_to_f(dat->real);
 }
 
 /*
  * call-seq:
- *    cmp.to_r  ->  rational
+ *   to_r -> rational
  *
- * Returns the value as a rational if possible (the imaginary part
- * should be exactly zero).
+ * Returns the value of <tt>self.real</tt> as a Rational, if possible:
  *
- *    Complex(1, 0).to_r    #=> (1/1)
- *    Complex(1, 0.0).to_r  # RangeError
- *    Complex(1, 2).to_r    # RangeError
+ *   Complex.rect(1, 0).to_r              # => (1/1)
+ *   Complex.rect(1, Rational(0, 1)).to_r # => (1/1)
+ *   Complex.rect(1, 0.0).to_r            # => (1/1)
  *
- * See rationalize.
+ * Raises RangeError if <tt>self.imag</tt> is not exactly zero
+ * (either <tt>Integer(0)</tt> or <tt>Rational(0, n)</tt>)
+ * and <tt>self.imag.to_r</tt> is not exactly zero.
+ *
+ * Related: Complex#rationalize.
  */
 static VALUE
 nucomp_to_r(VALUE self)
 {
     get_dat1(self);
 
-    if (!k_exact_zero_p(dat->imag)) {
-	rb_raise(rb_eRangeError, "can't convert %"PRIsVALUE" into Rational",
-		 self);
+    if (RB_FLOAT_TYPE_P(dat->imag) && FLOAT_ZERO_P(dat->imag)) {
+        /* Do nothing here */
+    }
+    else if (!k_exact_zero_p(dat->imag)) {
+        VALUE imag = rb_check_convert_type_with_id(dat->imag, T_RATIONAL, "Rational", idTo_r);
+        if (NIL_P(imag) || !k_exact_zero_p(imag)) {
+            rb_raise(rb_eRangeError, "can't convert %"PRIsVALUE" into Rational",
+                     self);
+        }
     }
     return f_to_r(dat->real);
 }
 
 /*
  * call-seq:
- *    cmp.rationalize([eps])  ->  rational
- *
- * Returns the value as a rational if possible (the imaginary part
- * should be exactly zero).
- *
- *    Complex(1.0/3, 0).rationalize  #=> (1/3)
- *    Complex(1, 0.0).rationalize    # RangeError
- *    Complex(1, 2).rationalize      # RangeError
- *
- * See to_r.
+ *   rationalize(epsilon = nil) -> rational
+ *
+ * Returns a Rational object whose value is exactly or approximately
+ * equivalent to that of <tt>self.real</tt>.
+ *
+ * With no argument +epsilon+ given, returns a \Rational object
+ * whose value is exactly equal to that of <tt>self.real.rationalize</tt>:
+ *
+ *   Complex.rect(1, 0).rationalize              # => (1/1)
+ *   Complex.rect(1, Rational(0, 1)).rationalize # => (1/1)
+ *   Complex.rect(3.14159, 0).rationalize        # => (314159/100000)
+ *
+ * With argument +epsilon+ given, returns a \Rational object
+ * whose value is exactly or approximately equal to that of <tt>self.real</tt>
+ * to the given precision:
+ *
+ *   Complex.rect(3.14159, 0).rationalize(0.1)          # => (16/5)
+ *   Complex.rect(3.14159, 0).rationalize(0.01)         # => (22/7)
+ *   Complex.rect(3.14159, 0).rationalize(0.001)        # => (201/64)
+ *   Complex.rect(3.14159, 0).rationalize(0.0001)       # => (333/106)
+ *   Complex.rect(3.14159, 0).rationalize(0.00001)      # => (355/113)
+ *   Complex.rect(3.14159, 0).rationalize(0.000001)     # => (7433/2366)
+ *   Complex.rect(3.14159, 0).rationalize(0.0000001)    # => (9208/2931)
+ *   Complex.rect(3.14159, 0).rationalize(0.00000001)   # => (47460/15107)
+ *   Complex.rect(3.14159, 0).rationalize(0.000000001)  # => (76149/24239)
+ *   Complex.rect(3.14159, 0).rationalize(0.0000000001) # => (314159/100000)
+ *   Complex.rect(3.14159, 0).rationalize(0.0)          # => (3537115888337719/1125899906842624)
+ *
+ * Related: Complex#to_r.
  */
 static VALUE
 nucomp_rationalize(int argc, VALUE *argv, VALUE self)
@@ -1658,12 +1923,9 @@ nucomp_rationalize(int argc, VALUE *argv, VALUE self)
 
 /*
  * call-seq:
- *    complex.to_c  ->  self
+ *   to_c -> self
  *
- * Returns self.
- *
- *    Complex(2).to_c      #=> (2+0i)
- *    Complex(-8, 6).to_c  #=> (-8+6i)
+ * Returns +self+.
  */
 static VALUE
 nucomp_to_c(VALUE self)
@@ -1673,21 +1935,9 @@ nucomp_to_c(VALUE self)
 
 /*
  * call-seq:
- *    nil.to_c  ->  (0+0i)
- *
- * Returns zero as a complex.
- */
-static VALUE
-nilclass_to_c(VALUE self)
-{
-    return rb_complex_new1(INT2FIX(0));
-}
-
-/*
- * call-seq:
- *    num.to_c  ->  complex
+ *   to_c -> complex
  *
- * Returns the value as a complex.
+ * Returns +self+ as a Complex object.
  */
 static VALUE
 numeric_to_c(VALUE self)
@@ -1703,14 +1953,14 @@ issign(int c)
 
 static int
 read_sign(const char **s,
-	  char **b)
+          char **b)
 {
     int sign = '?';
 
     if (issign(**s)) {
-	sign = **b = **s;
-	(*s)++;
-	(*b)++;
+        sign = **b = **s;
+        (*s)++;
+        (*b)++;
     }
     return sign;
 }
@@ -1723,32 +1973,32 @@ isdecimal(int c)
 
 static int
 read_digits(const char **s, int strict,
-	    char **b)
+            char **b)
 {
     int us = 1;
 
     if (!isdecimal(**s))
-	return 0;
+        return 0;
 
     while (isdecimal(**s) || **s == '_') {
-	if (**s == '_') {
-	    if (strict) {
-		if (us)
-		    return 0;
-	    }
-	    us = 1;
-	}
-	else {
-	    **b = **s;
-	    (*b)++;
-	    us = 0;
-	}
-	(*s)++;
+        if (**s == '_') {
+            if (us) {
+                if (strict) return 0;
+                break;
+            }
+            us = 1;
+        }
+        else {
+            **b = **s;
+            (*b)++;
+            us = 0;
+        }
+        (*s)++;
     }
     if (us)
-	do {
-	    (*s)--;
-	} while (**s == '_');
+        do {
+            (*s)--;
+        } while (**s == '_');
     return 1;
 }
 
@@ -1760,70 +2010,70 @@ islettere(int c)
 
 static int
 read_num(const char **s, int strict,
-	 char **b)
+         char **b)
 {
     if (**s != '.') {
-	if (!read_digits(s, strict, b))
-	    return 0;
+        if (!read_digits(s, strict, b))
+            return 0;
     }
 
     if (**s == '.') {
-	**b = **s;
-	(*s)++;
-	(*b)++;
-	if (!read_digits(s, strict, b)) {
-	    (*b)--;
-	    return 0;
-	}
+        **b = **s;
+        (*s)++;
+        (*b)++;
+        if (!read_digits(s, strict, b)) {
+            (*b)--;
+            return 0;
+        }
     }
 
     if (islettere(**s)) {
-	**b = **s;
-	(*s)++;
-	(*b)++;
-	read_sign(s, b);
-	if (!read_digits(s, strict, b)) {
-	    (*b)--;
-	    return 0;
-	}
+        **b = **s;
+        (*s)++;
+        (*b)++;
+        read_sign(s, b);
+        if (!read_digits(s, strict, b)) {
+            (*b)--;
+            return 0;
+        }
     }
     return 1;
 }
 
 inline static int
 read_den(const char **s, int strict,
-	 char **b)
+         char **b)
 {
     if (!read_digits(s, strict, b))
-	return 0;
+        return 0;
     return 1;
 }
 
 static int
 read_rat_nos(const char **s, int strict,
-	     char **b)
+             char **b)
 {
     if (!read_num(s, strict, b))
-	return 0;
+        return 0;
     if (**s == '/') {
-	**b = **s;
-	(*s)++;
-	(*b)++;
-	if (!read_den(s, strict, b)) {
-	    (*b)--;
-	    return 0;
-	}
+        **b = **s;
+        (*s)++;
+        (*b)++;
+        if (!read_den(s, strict, b)) {
+            (*b)--;
+            return 0;
+        }
     }
     return 1;
 }
 
 static int
 read_rat(const char **s, int strict,
-	 char **b)
+         char **b)
 {
     read_sign(s, b);
     if (!read_rat_nos(s, strict, b))
-	return 0;
+        return 0;
     return 1;
 }
 
@@ -1831,22 +2081,22 @@ inline static int
 isimagunit(int c)
 {
     return (c == 'i' || c == 'I' ||
-	    c == 'j' || c == 'J');
+            c == 'j' || c == 'J');
 }
 
 static VALUE
 str2num(char *s)
 {
     if (strchr(s, '/'))
-	return rb_cstr_to_rat(s, 0);
+        return rb_cstr_to_rat(s, 0);
     if (strpbrk(s, ".eE"))
-	return DBL2NUM(rb_cstr_to_dbl(s, 0));
+        return DBL2NUM(rb_cstr_to_dbl(s, 0));
     return rb_cstr_to_inum(s, 10, 0);
 }
 
 static int
 read_comp(const char **s, int strict,
-	  VALUE *ret, char **b)
+          VALUE *ret, char **b)
 {
     char *bb;
     int sign;
@@ -1857,72 +2107,72 @@ read_comp(const char **s, int strict,
     sign = read_sign(s, b);
 
     if (isimagunit(**s)) {
-	(*s)++;
-	num = INT2FIX((sign == '-') ? -1 : + 1);
-	*ret = rb_complex_new2(ZERO, num);
-	return 1; /* e.g. "i" */
+        (*s)++;
+        num = INT2FIX((sign == '-') ? -1 : + 1);
+        *ret = rb_complex_new2(ZERO, num);
+        return 1; /* e.g. "i" */
     }
 
     if (!read_rat_nos(s, strict, b)) {
-	**b = '\0';
-	num = str2num(bb);
-	*ret = rb_complex_new2(num, ZERO);
-	return 0; /* e.g. "-" */
+        **b = '\0';
+        num = str2num(bb);
+        *ret = rb_complex_new2(num, ZERO);
+        return 0; /* e.g. "-" */
     }
     **b = '\0';
     num = str2num(bb);
 
     if (isimagunit(**s)) {
-	(*s)++;
-	*ret = rb_complex_new2(ZERO, num);
-	return 1; /* e.g. "3i" */
+        (*s)++;
+        *ret = rb_complex_new2(ZERO, num);
+        return 1; /* e.g. "3i" */
     }
 
     if (**s == '@') {
-	int st;
-
-	(*s)++;
-	bb = *b;
-	st = read_rat(s, strict, b);
-	**b = '\0';
-	if (strlen(bb) < 1 ||
-	    !isdecimal(*(bb + strlen(bb) - 1))) {
-	    *ret = rb_complex_new2(num, ZERO);
-	    return 0; /* e.g. "1@-" */
-	}
-	num2 = str2num(bb);
-	*ret = rb_complex_new_polar(num, num2);
-	if (!st)
-	    return 0; /* e.g. "1@2." */
-	else
-	    return 1; /* e.g. "1@2" */
+        int st;
+
+        (*s)++;
+        bb = *b;
+        st = read_rat(s, strict, b);
+        **b = '\0';
+        if (strlen(bb) < 1 ||
+            !isdecimal(*(bb + strlen(bb) - 1))) {
+            *ret = rb_complex_new2(num, ZERO);
+            return 0; /* e.g. "1@-" */
+        }
+        num2 = str2num(bb);
+        *ret = rb_complex_new_polar(num, num2);
+        if (!st)
+            return 0; /* e.g. "1@2." */
+        else
+            return 1; /* e.g. "1@2" */
     }
 
     if (issign(**s)) {
-	bb = *b;
-	sign = read_sign(s, b);
-	if (isimagunit(**s))
-	    num2 = INT2FIX((sign == '-') ? -1 : + 1);
-	else {
-	    if (!read_rat_nos(s, strict, b)) {
-		*ret = rb_complex_new2(num, ZERO);
-		return 0; /* e.g. "1+xi" */
-	    }
-	    **b = '\0';
-	    num2 = str2num(bb);
-	}
-	if (!isimagunit(**s)) {
-	    *ret = rb_complex_new2(num, ZERO);
-	    return 0; /* e.g. "1+3x" */
-	}
-	(*s)++;
-	*ret = rb_complex_new2(num, num2);
-	return 1; /* e.g. "1+2i" */
+        bb = *b;
+        sign = read_sign(s, b);
+        if (isimagunit(**s))
+            num2 = INT2FIX((sign == '-') ? -1 : + 1);
+        else {
+            if (!read_rat_nos(s, strict, b)) {
+                *ret = rb_complex_new2(num, ZERO);
+                return 0; /* e.g. "1+xi" */
+            }
+            **b = '\0';
+            num2 = str2num(bb);
+        }
+        if (!isimagunit(**s)) {
+            *ret = rb_complex_new2(num, ZERO);
+            return 0; /* e.g. "1+3x" */
+        }
+        (*s)++;
+        *ret = rb_complex_new2(num, num2);
+        return 1; /* e.g. "1+2i" */
     }
     /* !(@, - or +) */
     {
-	*ret = rb_complex_new2(num, ZERO);
-	return 1; /* e.g. "3" */
+        *ret = rb_complex_new2(num, ZERO);
+        return 1; /* e.g. "3" */
     }
 }
 
@@ -1930,7 +2180,7 @@ inline static void
 skip_ws(const char **s)
 {
     while (isspace((unsigned char)**s))
-	(*s)++;
+        (*s)++;
 }
 
 static int
@@ -1967,26 +2217,17 @@ string_to_c_strict(VALUE self, int raise)
 
     rb_must_asciicompat(self);
 
-    s = RSTRING_PTR(self);
-
-    if (!s || memchr(s, '\0', RSTRING_LEN(self))) {
-        if (!raise) return Qnil;
-	rb_raise(rb_eArgError, "string contains null byte");
+    if (raise) {
+        s = StringValueCStr(self);
     }
-
-    if (s && s[RSTRING_LEN(self)]) {
-	rb_str_modify(self);
-	s = RSTRING_PTR(self);
-	s[RSTRING_LEN(self)] = '\0';
+    else if (!(s = rb_str_to_cstr(self))) {
+        return Qnil;
     }
 
-    if (!s)
-	s = (char *)"";
-
-    if (!parse_comp(s, 1, &num)) {
+    if (!parse_comp(s, TRUE, &num)) {
         if (!raise) return Qnil;
-	rb_raise(rb_eArgError, "invalid value for convert(): %+"PRIsVALUE,
-		 self);
+        rb_raise(rb_eArgError, "invalid value for convert(): %+"PRIsVALUE,
+                 self);
     }
 
     return num;
@@ -1994,47 +2235,167 @@ string_to_c_strict(VALUE self, int raise)
 
 /*
  * call-seq:
- *    str.to_c  ->  complex
- *
- * Returns a complex which denotes the string form.  The parser
- * ignores leading whitespaces and trailing garbage.  Any digit
- * sequences can be separated by an underscore.  Returns zero for null
- * or garbage string.
- *
- *    '9'.to_c           #=> (9+0i)
- *    '2.5'.to_c         #=> (2.5+0i)
- *    '2.5/1'.to_c       #=> ((5/2)+0i)
- *    '-3/2'.to_c        #=> ((-3/2)+0i)
- *    '-i'.to_c          #=> (0-1i)
- *    '45i'.to_c         #=> (0+45i)
- *    '3-4i'.to_c        #=> (3-4i)
- *    '-4e2-4e-2i'.to_c  #=> (-400.0-0.04i)
- *    '-0.0-0.0i'.to_c   #=> (-0.0-0.0i)
- *    '1/2+3/4i'.to_c    #=> ((1/2)+(3/4)*i)
- *    'ruby'.to_c        #=> (0+0i)
- *
- * See Kernel.Complex.
+ *   to_c -> complex
+ *
+ * Returns a Complex object:
+ * parses the leading substring of +self+
+ * to extract two numeric values that become the coordinates of the complex object.
+ *
+ * The substring is interpreted as containing
+ * either rectangular coordinates (real and imaginary parts)
+ * or polar coordinates (magnitude and angle parts),
+ * depending on an included or implied "separator" character:
+ *
+ * - <tt>'+'</tt>, <tt>'-'</tt>, or no separator: rectangular coordinates.
+ * - <tt>'@'</tt>: polar coordinates.
+ *
+ * <b>In Brief</b>
+ *
+ * In these examples, we use method Complex#rect to display rectangular coordinates,
+ * and method Complex#polar to display polar coordinates.
+ *
+ *   # Rectangular coordinates.
+ *
+ *   # Real-only: no separator; imaginary part is zero.
+ *   '9'.to_c.rect         # => [9, 0]         # Integer.
+ *   '-9'.to_c.rect        # => [-9, 0]        # Integer (negative).
+ *   '2.5'.to_c.rect       # => [2.5, 0]       # Float.
+ *   '1.23e-14'.to_c.rect  # => [1.23e-14, 0]  # Float with exponent.
+ *   '2.5/1'.to_c.rect     # => [(5/2), 0]     # Rational.
+ *
+ *   # Some things are ignored.
+ *   'foo1'.to_c.rect      # => [0, 0]         # Unparsed entire substring.
+ *   '1foo'.to_c.rect      # => [1, 0]         # Unparsed trailing substring.
+ *   ' 1 '.to_c.rect       # => [1, 0]         # Leading and trailing whitespace.
+ *   *
+ *   # Imaginary only: trailing 'i' required; real part is zero.
+ *   '9i'.to_c.rect        # => [0, 9]
+ *   '-9i'.to_c.rect       # => [0, -9]
+ *   '2.5i'.to_c.rect      # => [0, 2.5]
+ *   '1.23e-14i'.to_c.rect # => [0, 1.23e-14]
+ *   '2.5/1i'.to_c.rect    # => [0, (5/2)]
+ *
+ *   # Real and imaginary; '+' or '-' separator; trailing 'i' required.
+ *   '2+3i'.to_c.rect      # => [2, 3]
+ *   '-2-3i'.to_c.rect     # => [-2, -3]
+ *   '2.5+3i'.to_c.rect    # => [2.5, 3]
+ *   '2.5+3/2i'.to_c.rect  # => [2.5, (3/2)]
+ *
+ *   # Polar coordinates; '@' separator; magnitude required.
+ *   '1.0@0'.to_c.polar             # => [1.0, 0.0]
+ *   '1.0@'.to_c.polar              # => [1.0, 0.0]
+ *   "1.0@#{Math::PI}".to_c.polar   # => [1.0, 3.141592653589793]
+ *   "1.0@#{Math::PI/2}".to_c.polar # => [1.0, 1.5707963267948966]
+ *
+ * <b>Parsed Values</b>
+ *
+ * The parsing may be thought of as searching for numeric literals
+ * embedded in the substring.
+ *
+ * This section shows how the method parses numeric values from leading substrings.
+ * The examples show real-only or imaginary-only parsing;
+ * the parsing is the same for each part.
+ *
+ *   '1foo'.to_c # => (1+0i)      # Ignores trailing unparsed characters.
+ *   ' 1 '.to_c  # => (1+0i)      # Ignores leading and trailing whitespace.
+ *   'x1'.to_c   # => (0+0i)      # Finds no leading numeric.
+ *
+ *   # Integer literal embedded in the substring.
+ *   '1'.to_c       # => (1+0i)
+ *   '-1'.to_c      # => (-1+0i)
+ *   '1i'.to_c      # => (0+1i)
+ *
+ *   # Integer literals that don't work.
+ *   '0b100'.to_c   # => (0+0i)   # Not parsed as binary.
+ *   '0o100'.to_c   # => (0+0i)   # Not parsed as octal.
+ *   '0d100'.to_c   # => (0+0i)   # Not parsed as decimal.
+ *   '0x100'.to_c   # => (0+0i)   # Not parsed as hexadecimal.
+ *   '010'.to_c     # => (10+0i)  # Not parsed as octal.
+ *
+ *   # Float literals:
+ *   '3.14'.to_c    # => (3.14+0i)
+ *   '3.14i'.to_c   # => (0+3.14i)
+ *   '1.23e4'.to_c  # => (12300.0+0i)
+ *   '1.23e+4'.to_c # => (12300.0+0i)
+ *   '1.23e-4'.to_c # => (0.000123+0i)
+ *
+ *   # Rational literals:
+ *   '1/2'.to_c     # => ((1/2)+0i)
+ *   '-1/2'.to_c    # => ((-1/2)+0i)
+ *   '1/2r'.to_c    # => ((1/2)+0i)
+ *   '-1/2r'.to_c   # => ((-1/2)+0i)
+ *
+ * <b>Rectangular Coordinates</b>
+ *
+ * With separator <tt>'+'</tt> or <tt>'-'</tt>,
+ * or with no separator,
+ * interprets the values as rectangular coordinates: real and imaginary.
+ *
+ * With no separator, assigns a single value to either the real or the imaginary part:
+ *
+ *   ''.to_c  # => (0+0i)  # Defaults to zero.
+ *  '1'.to_c  # => (1+0i)  # Real (no trailing 'i').
+ *  '1i'.to_c # => (0+1i)  # Imaginary (trailing 'i').
+ *  'i'.to_c  # => (0+1i)  # Special case (imaginary 1).
+ *
+ * With separator <tt>'+'</tt>, both parts positive (or zero):
+ *
+ *   # Without trailing 'i'.
+ *   '+'.to_c    # => (0+0i)  # No values: defaults to zero.
+ *   '+1'.to_c   # => (1+0i)  # Value after '+': real only.
+ *   '1+'.to_c   # => (1+0i)  # Value before '+': real only.
+ *   '2+1'.to_c  # => (2+0i)  # Values before and after '+': real and imaginary.
+ *   # With trailing 'i'.
+ *   '+1i'.to_c  # => (0+1i)  # Value after '+': imaginary only.
+ *   '2+i'.to_c  # => (2+1i)  # Value before '+': real and imaginary 1.
+ *   '2+1i'.to_c # => (2+1i)  # Values before and after '+': real and imaginary.
+ *
+ * With separator <tt>'-'</tt>, negative imaginary part:
+ *
+ *   # Without trailing 'i'.
+ *   '-'.to_c    # => (0+0i)   # No values: defaults to zero.
+ *   '-1'.to_c   # => (-1+0i)  # Value after '-': negative real, zero imaginary.
+ *   '1-'.to_c   # => (1+0i)   # Value before '-': positive real, zero imaginary.
+ *   '2-1'.to_c  # => (2+0i)   # Values before and after '-': positive real, zero imaginary.
+ *   # With trailing 'i'.
+ *   '-1i'.to_c  # => (0-1i)   # Value after '-': negative real, zero imaginary.
+ *   '2-i'.to_c  # => (2-1i)   # Value before '-': positive real, negative imaginary.
+ *   '2-1i'.to_c # => (2-1i)   # Values before and after '-': positive real, negative imaginary.
+ *
+ * Note that the suffixed character <tt>'i'</tt>
+ * may instead be one of <tt>'I'</tt>, <tt>'j'</tt>, or <tt>'J'</tt>,
+ * with the same effect.
+ *
+ * <b>Polar Coordinates</b>
+ *
+ * With separator <tt>'@'</tt>)
+ * interprets the values as polar coordinates: magnitude and angle.
+ *
+ *   '2@'.to_c.polar  # => [2, 0.0]    # Value before '@': magnitude only.
+ *    # Values before and after '@': magnitude and angle.
+ *   '2@1'.to_c.polar # => [2.0, 1.0]
+ *   "1.0@#{Math::PI/2}".to_c # => (0.0+1i)
+ *   "1.0@#{Math::PI}".to_c   # => (-1+0.0i)
+ *   # Magnitude not given: defaults to zero.
+ *   '@'.to_c.polar   # => [0, 0.0]
+ *   '@1'.to_c.polar  # => [0, 0.0]
+ *
+ *   '1.0@0'.to_c             # => (1+0.0i)
+ *
+ * Note that in all cases, the suffixed character <tt>'i'</tt>
+ * may instead be one of <tt>'I'</tt>, <tt>'j'</tt>, <tt>'J'</tt>,
+ * with the same effect.
+ *
+ * See {Converting to Non-String}[rdoc-ref:String@Converting+to+Non--5CString].
  */
 static VALUE
 string_to_c(VALUE self)
 {
-    char *s;
     VALUE num;
 
     rb_must_asciicompat(self);
 
-    s = RSTRING_PTR(self);
-
-    if (s && s[RSTRING_LEN(self)]) {
-	rb_str_modify(self);
-	s = RSTRING_PTR(self);
-	s[RSTRING_LEN(self)] = '\0';
-    }
-
-    if (!s)
-	s = (char *)"";
-
-    (void)parse_comp(s, 0, &num);
+    (void)parse_comp(rb_str_fill_terminator(self, 1), FALSE, &num);
 
     return num;
 }
@@ -2050,65 +2411,68 @@ nucomp_convert(VALUE klass, VALUE a1, VALUE a2, int raise)
 {
     if (NIL_P(a1) || NIL_P(a2)) {
         if (!raise) return Qnil;
-	rb_raise(rb_eTypeError, "can't convert nil into Complex");
+        rb_raise(rb_eTypeError, "can't convert nil into Complex");
     }
 
     if (RB_TYPE_P(a1, T_STRING)) {
-	a1 = string_to_c_strict(a1, raise);
+        a1 = string_to_c_strict(a1, raise);
         if (NIL_P(a1)) return Qnil;
     }
 
     if (RB_TYPE_P(a2, T_STRING)) {
-	a2 = string_to_c_strict(a2, raise);
+        a2 = string_to_c_strict(a2, raise);
         if (NIL_P(a2)) return Qnil;
     }
 
     if (RB_TYPE_P(a1, T_COMPLEX)) {
-	{
-	    get_dat1(a1);
+        {
+            get_dat1(a1);
 
-	    if (k_exact_zero_p(dat->imag))
-		a1 = dat->real;
-	}
+            if (k_exact_zero_p(dat->imag))
+                a1 = dat->real;
+        }
     }
 
     if (RB_TYPE_P(a2, T_COMPLEX)) {
-	{
-	    get_dat1(a2);
+        {
+            get_dat1(a2);
 
-	    if (k_exact_zero_p(dat->imag))
-		a2 = dat->real;
-	}
+            if (k_exact_zero_p(dat->imag))
+                a2 = dat->real;
+        }
     }
 
     if (RB_TYPE_P(a1, T_COMPLEX)) {
-	if (a2 == Qundef || (k_exact_zero_p(a2)))
-	    return a1;
-    }
-
-    if (a2 == Qundef) {
-	if (k_numeric_p(a1) && !f_real_p(a1))
-	    return a1;
-	/* should raise exception for consistency */
-	if (!k_numeric_p(a1)) {
-            if (!raise)
-                return rb_protect(to_complex, a1, NULL);
-	    return to_complex(a1);
+        if (UNDEF_P(a2) || (k_exact_zero_p(a2)))
+            return a1;
+    }
+
+    if (UNDEF_P(a2)) {
+        if (k_numeric_p(a1) && !f_real_p(a1))
+            return a1;
+        /* should raise exception for consistency */
+        if (!k_numeric_p(a1)) {
+            if (!raise) {
+                a1 = rb_protect(to_complex, a1, NULL);
+                rb_set_errinfo(Qnil);
+                return a1;
+            }
+            return to_complex(a1);
         }
     }
     else {
-	if ((k_numeric_p(a1) && k_numeric_p(a2)) &&
-	    (!f_real_p(a1) || !f_real_p(a2)))
-	    return f_add(a1,
-			 f_mul(a2,
-			       f_complex_new_bang2(rb_cComplex, ZERO, ONE)));
+        if ((k_numeric_p(a1) && k_numeric_p(a2)) &&
+            (!f_real_p(a1) || !f_real_p(a2)))
+            return f_add(a1,
+                         f_mul(a2,
+                               f_complex_new_bang2(rb_cComplex, ZERO, ONE)));
     }
 
     {
         int argc;
-	VALUE argv2[2];
-	argv2[0] = a1;
-        if (a2 == Qundef) {
+        VALUE argv2[2];
+        argv2[0] = a1;
+        if (UNDEF_P(a2)) {
             argv2[1] = Qnil;
             argc = 1;
         }
@@ -2118,7 +2482,7 @@ nucomp_convert(VALUE klass, VALUE a1, VALUE a2, int raise)
             argv2[1] = a2;
             argc = 2;
         }
-	return nucomp_s_new(argc, argv2, klass);
+        return nucomp_s_new(argc, argv2, klass);
     }
 }
 
@@ -2136,34 +2500,9 @@ nucomp_s_convert(int argc, VALUE *argv, VALUE klass)
 
 /*
  * call-seq:
- *    num.real  ->  self
+ *   abs2 -> real
  *
- * Returns self.
- */
-static VALUE
-numeric_real(VALUE self)
-{
-    return self;
-}
-
-/*
- * call-seq:
- *    num.imag       ->  0
- *    num.imaginary  ->  0
- *
- * Returns zero.
- */
-static VALUE
-numeric_imag(VALUE self)
-{
-    return INT2FIX(0);
-}
-
-/*
- * call-seq:
- *    num.abs2  ->  real
- *
- * Returns square of self.
+ * Returns the square of +self+.
  */
 static VALUE
 numeric_abs2(VALUE self)
@@ -2173,11 +2512,9 @@ numeric_abs2(VALUE self)
 
 /*
  * call-seq:
- *    num.arg    ->  0 or float
- *    num.angle  ->  0 or float
- *    num.phase  ->  0 or float
+ *   arg -> 0 or Math::PI
  *
- * Returns 0 if the value is positive, pi otherwise.
+ * Returns zero if +self+ is positive, Math::PI otherwise.
  */
 static VALUE
 numeric_arg(VALUE self)
@@ -2189,10 +2526,9 @@ numeric_arg(VALUE self)
 
 /*
  * call-seq:
- *    num.rect  ->  array
- *    num.rectangular  ->  array
+ *   rect -> array
  *
- * Returns an array; [num, 0].
+ * Returns array <tt>[self, 0]</tt>.
  */
 static VALUE
 numeric_rect(VALUE self)
@@ -2202,9 +2538,9 @@ numeric_rect(VALUE self)
 
 /*
  * call-seq:
- *    num.polar  ->  array
+ *   polar -> array
  *
- * Returns an array; [num.abs, num.arg].
+ * Returns array <tt>[self.abs, self.arg]</tt>.
  */
 static VALUE
 numeric_polar(VALUE self)
@@ -2232,75 +2568,152 @@ numeric_polar(VALUE self)
 
 /*
  * call-seq:
- *    num.conj       ->  self
- *    num.conjugate  ->  self
+ *   arg -> 0 or Math::PI
  *
- * Returns self.
- */
-static VALUE
-numeric_conj(VALUE self)
-{
-    return self;
-}
-
-/*
- * call-seq:
- *    flo.arg    ->  0 or float
- *    flo.angle  ->  0 or float
- *    flo.phase  ->  0 or float
- *
- * Returns 0 if the value is positive, pi otherwise.
+ * Returns 0 if +self+ is positive, Math::PI otherwise.
  */
 static VALUE
 float_arg(VALUE self)
 {
     if (isnan(RFLOAT_VALUE(self)))
-	return self;
+        return self;
     if (f_tpositive_p(self))
-	return INT2FIX(0);
+        return INT2FIX(0);
     return rb_const_get(rb_mMath, id_PI);
 }
 
 /*
- * A complex number can be represented as a paired real number with
- * imaginary unit; a+bi.  Where a is real part, b is imaginary part
- * and i is imaginary unit.  Real a equals complex a+0i
- * mathematically.
+ * A \Complex object houses a pair of values,
+ * given when the object is created as either <i>rectangular coordinates</i>
+ * or <i>polar coordinates</i>.
+ *
+ * == Rectangular Coordinates
  *
- * You can create a \Complex object explicitly with:
+ * The rectangular coordinates of a complex number
+ * are called the _real_ and _imaginary_ parts;
+ * see {Complex number definition}[https://en.wikipedia.org/wiki/Complex_number#Definition_and_basic_operations].
+ *
+ * You can create a \Complex object from rectangular coordinates with:
  *
  * - A {complex literal}[rdoc-ref:syntax/literals.rdoc@Complex+Literals].
+ * - Method Complex.rect.
+ * - Method Kernel#Complex, either with numeric arguments or with certain string arguments.
+ * - Method String#to_c, for certain strings.
+ *
+ * Note that each of the stored parts may be a an instance one of the classes
+ * Complex, Float, Integer, or Rational;
+ * they may be retrieved:
+ *
+ * - Separately, with methods Complex#real and Complex#imaginary.
+ * - Together, with method Complex#rect.
+ *
+ * The corresponding (computed) polar values may be retrieved:
+ *
+ * - Separately, with methods Complex#abs and Complex#arg.
+ * - Together, with method Complex#polar.
+ *
+ * == Polar Coordinates
+ *
+ * The polar coordinates of a complex number
+ * are called the _absolute_ and _argument_ parts;
+ * see {Complex polar plane}[https://en.wikipedia.org/wiki/Complex_number#Polar_form].
+ *
+ * In this class, the argument part
+ * in expressed {radians}[https://en.wikipedia.org/wiki/Radian]
+ * (not {degrees}[https://en.wikipedia.org/wiki/Degree_(angle)]).
+ *
+ * You can create a \Complex object from polar coordinates with:
+ *
+ * - Method Complex.polar.
+ * - Method Kernel#Complex, with certain string arguments.
+ * - Method String#to_c, for certain strings.
+ *
+ * Note that each of the stored parts may be a an instance one of the classes
+ * Complex, Float, Integer, or Rational;
+ * they may be retrieved:
+ *
+ * - Separately, with methods Complex#abs and Complex#arg.
+ * - Together, with method Complex#polar.
+ *
+ * The corresponding (computed) rectangular values may be retrieved:
+ *
+ * - Separately, with methods Complex#real and Complex#imag.
+ * - Together, with method Complex#rect.
+ *
+ * == What's Here
+ *
+ * First, what's elsewhere:
+ *
+ * - Class \Complex inherits (directly or indirectly)
+ *   from classes {Numeric}[rdoc-ref:Numeric@What-27s+Here]
+ *   and {Object}[rdoc-ref:Object@What-27s+Here].
+ * - Includes (indirectly) module {Comparable}[rdoc-ref:Comparable@What-27s+Here].
+ *
+ * Here, class \Complex has methods for:
+ *
+ * === Creating \Complex Objects
+ *
+ * - ::polar: Returns a new \Complex object based on given polar coordinates.
+ * - ::rect (and its alias ::rectangular):
+ *   Returns a new \Complex object based on given rectangular coordinates.
+ *
+ * === Querying
+ *
+ * - #abs (and its alias #magnitude): Returns the absolute value for +self+.
+ * - #arg (and its aliases #angle and #phase):
+ *   Returns the argument (angle) for +self+ in radians.
+ * - #denominator: Returns the denominator of +self+.
+ * - #finite?: Returns whether both +self.real+ and +self.image+ are finite.
+ * - #hash: Returns the integer hash value for +self+.
+ * - #imag (and its alias #imaginary): Returns the imaginary value for +self+.
+ * - #infinite?: Returns whether +self.real+ or +self.image+ is infinite.
+ * - #numerator: Returns the numerator of +self+.
+ * - #polar: Returns the array <tt>[self.abs, self.arg]</tt>.
+ * - #inspect: Returns a string representation of +self+.
+ * - #real: Returns the real value for +self+.
+ * - #real?: Returns +false+; for compatibility with Numeric#real?.
+ * - #rect (and its alias #rectangular):
+ *   Returns the array <tt>[self.real, self.imag]</tt>.
+ *
+ * === Comparing
+ *
+ * - #<=>: Returns whether +self+ is less than, equal to, or greater than the given argument.
+ * - #==: Returns whether +self+ is equal to the given argument.
  *
- * You can convert certain objects to \Complex objects with:
+ * === Converting
  *
- * - \Method #Complex.
+ * - #rationalize: Returns a Rational object whose value is exactly
+ *   or approximately equivalent to that of <tt>self.real</tt>.
+ * - #to_c: Returns +self+.
+ * - #to_d: Returns the value as a BigDecimal object.
+ * - #to_f: Returns the value of <tt>self.real</tt> as a Float, if possible.
+ * - #to_i: Returns the value of <tt>self.real</tt> as an Integer, if possible.
+ * - #to_r: Returns the value of <tt>self.real</tt> as a Rational, if possible.
+ * - #to_s: Returns a string representation of +self+.
  *
- * Complex object can be created as literal, and also by using
- * Kernel#Complex, Complex::rect, Complex::polar or to_c method.
+ * === Performing Complex Arithmetic
  *
- *    2+1i                 #=> (2+1i)
- *    Complex(1)           #=> (1+0i)
- *    Complex(2, 3)        #=> (2+3i)
- *    Complex.polar(2, 3)  #=> (-1.9799849932008908+0.2822400161197344i)
- *    3.to_c               #=> (3+0i)
+ * - #*: Returns the product of +self+ and the given numeric.
+ * - #**: Returns +self+ raised to power of the given numeric.
+ * - #+: Returns the sum of +self+ and the given numeric.
+ * - #-: Returns the difference of +self+ and the given numeric.
+ * - #-@: Returns the negation of +self+.
+ * - #/: Returns the quotient of +self+ and the given numeric.
+ * - #abs2: Returns square of the absolute value (magnitude) for +self+.
+ * - #conj (and its alias #conjugate): Returns the conjugate of +self+.
+ * - #fdiv: Returns <tt>Complex.rect(self.real/numeric, self.imag/numeric)</tt>.
  *
- * You can also create complex object from floating-point numbers or
- * strings.
+ * === Working with JSON
  *
- *    Complex(0.3)         #=> (0.3+0i)
- *    Complex('0.3-0.5i')  #=> (0.3-0.5i)
- *    Complex('2/3+3/4i')  #=> ((2/3)+(3/4)*i)
- *    Complex('1@2')       #=> (-0.4161468365471424+0.9092974268256817i)
+ * - ::json_create: Returns a new \Complex object,
+ *   deserialized from the given serialized hash.
+ * - #as_json: Returns a serialized hash constructed from +self+.
+ * - #to_json: Returns a JSON string representing +self+.
  *
- *    0.3.to_c             #=> (0.3+0i)
- *    '0.3-0.5i'.to_c      #=> (0.3-0.5i)
- *    '2/3+3/4i'.to_c      #=> ((2/3)+(3/4)*i)
- *    '1@2'.to_c           #=> (-0.4161468365471424+0.9092974268256817i)
+ * These methods are provided by the {JSON gem}[https://github.com/ruby/json]. To make these methods available:
  *
- * A complex object is either an exact or an inexact number.
+ *   require 'json/add/complex'
  *
- *    Complex(1, 1) / 2    #=> ((1/2)+(1/2)*i)
- *    Complex(1, 1) / 2.0  #=> (0.5+0.5i)
  */
 void
 Init_Complex(void)
@@ -2401,16 +2814,12 @@ Init_Complex(void)
     rb_define_method(rb_cComplex, "to_r", nucomp_to_r, 0);
     rb_define_method(rb_cComplex, "rationalize", nucomp_rationalize, -1);
     rb_define_method(rb_cComplex, "to_c", nucomp_to_c, 0);
-    rb_define_method(rb_cNilClass, "to_c", nilclass_to_c, 0);
     rb_define_method(rb_cNumeric, "to_c", numeric_to_c, 0);
 
     rb_define_method(rb_cString, "to_c", string_to_c, 0);
 
     rb_define_private_method(CLASS_OF(rb_cComplex), "convert", nucomp_s_convert, -1);
 
-    rb_define_method(rb_cNumeric, "real", numeric_real, 0);
-    rb_define_method(rb_cNumeric, "imaginary", numeric_imag, 0);
-    rb_define_method(rb_cNumeric, "imag", numeric_imag, 0);
     rb_define_method(rb_cNumeric, "abs2", numeric_abs2, 0);
     rb_define_method(rb_cNumeric, "arg", numeric_arg, 0);
     rb_define_method(rb_cNumeric, "angle", numeric_arg, 0);
@@ -2418,21 +2827,23 @@ Init_Complex(void)
     rb_define_method(rb_cNumeric, "rectangular", numeric_rect, 0);
     rb_define_method(rb_cNumeric, "rect", numeric_rect, 0);
     rb_define_method(rb_cNumeric, "polar", numeric_polar, 0);
-    rb_define_method(rb_cNumeric, "conjugate", numeric_conj, 0);
-    rb_define_method(rb_cNumeric, "conj", numeric_conj, 0);
 
     rb_define_method(rb_cFloat, "arg", float_arg, 0);
     rb_define_method(rb_cFloat, "angle", float_arg, 0);
     rb_define_method(rb_cFloat, "phase", float_arg, 0);
 
     /*
-     * The imaginary unit.
+     * Equivalent
+     * to <tt>Complex.rect(0, 1)</tt>:
+     *
+     *   Complex::I # => (0+1i)
+     *
      */
     rb_define_const(rb_cComplex, "I",
-		    f_complex_new_bang2(rb_cComplex, ZERO, ONE));
+                    f_complex_new_bang2(rb_cComplex, ZERO, ONE));
 
 #if !USE_FLONUM
-    rb_gc_register_mark_object(RFLOAT_0 = DBL2NUM(0.0));
+    rb_vm_register_global_object(RFLOAT_0 = DBL2NUM(0.0));
 #endif
 
     rb_provide("complex.so");	/* for backward compatibility */
diff --git a/concurrent_set.c b/concurrent_set.c
new file mode 100644
index 0000000000..234b6408b6
--- /dev/null
+++ b/concurrent_set.c
@@ -0,0 +1,513 @@
+#include "internal.h"
+#include "internal/gc.h"
+#include "internal/concurrent_set.h"
+#include "ruby/atomic.h"
+#include "vm_sync.h"
+
+#define CONCURRENT_SET_CONTINUATION_BIT ((VALUE)1 << (sizeof(VALUE) * CHAR_BIT - 1))
+#define CONCURRENT_SET_HASH_MASK (~CONCURRENT_SET_CONTINUATION_BIT)
+
+enum concurrent_set_special_values {
+    CONCURRENT_SET_EMPTY,
+    CONCURRENT_SET_DELETED,
+    CONCURRENT_SET_MOVED,
+    CONCURRENT_SET_SPECIAL_VALUE_COUNT
+};
+
+struct concurrent_set_entry {
+    VALUE hash;
+    VALUE key;
+};
+
+struct concurrent_set {
+    rb_atomic_t size;
+    unsigned int capacity;
+    unsigned int deleted_entries;
+    const struct rb_concurrent_set_funcs *funcs;
+    struct concurrent_set_entry *entries;
+};
+
+static void
+concurrent_set_mark_continuation(struct concurrent_set_entry *entry, VALUE curr_hash_and_flags)
+{
+    if (curr_hash_and_flags & CONCURRENT_SET_CONTINUATION_BIT) return;
+
+    RUBY_ASSERT((curr_hash_and_flags & CONCURRENT_SET_HASH_MASK) != 0);
+
+    VALUE new_hash = curr_hash_and_flags | CONCURRENT_SET_CONTINUATION_BIT;
+    VALUE prev_hash = rbimpl_atomic_value_cas(&entry->hash, curr_hash_and_flags, new_hash, RBIMPL_ATOMIC_RELEASE, RBIMPL_ATOMIC_RELAXED);
+
+    // At the moment we only expect to be racing concurrently against another
+    // thread also setting the continuation bit.
+    // In the future if deletion is concurrent this will need adjusting
+    RUBY_ASSERT(prev_hash == curr_hash_and_flags || prev_hash == new_hash);
+    (void)prev_hash;
+}
+
+static VALUE
+concurrent_set_hash(const struct concurrent_set *set, VALUE key)
+{
+    VALUE hash = set->funcs->hash(key);
+    hash &= CONCURRENT_SET_HASH_MASK;
+    if (hash == 0) {
+        hash ^= CONCURRENT_SET_HASH_MASK;
+    }
+    RUBY_ASSERT(hash != 0);
+    RUBY_ASSERT(!(hash & CONCURRENT_SET_CONTINUATION_BIT));
+    return hash;
+}
+
+static void
+concurrent_set_free(void *ptr)
+{
+    struct concurrent_set *set = ptr;
+    xfree(set->entries);
+}
+
+static size_t
+concurrent_set_size(const void *ptr)
+{
+    const struct concurrent_set *set = ptr;
+    return sizeof(struct concurrent_set) +
+        (set->capacity * sizeof(struct concurrent_set_entry));
+}
+
+/* Hack: Though it would be trivial, we're intentionally avoiding WB-protecting
+ * this object. This prevents the object from aging and ensures it can always be
+ * collected in a minor GC.
+ * Longer term this deserves a better way to reclaim memory promptly.
+ */
+static void
+concurrent_set_mark(void *ptr)
+{
+    (void)ptr;
+}
+
+static const rb_data_type_t concurrent_set_type = {
+    .wrap_struct_name = "VM/concurrent_set",
+    .function = {
+        .dmark = concurrent_set_mark,
+        .dfree = concurrent_set_free,
+        .dsize = concurrent_set_size,
+    },
+    /* Hack: NOT WB_PROTECTED on purpose (see above) */
+    .flags = RUBY_TYPED_FREE_IMMEDIATELY | RUBY_TYPED_EMBEDDABLE
+};
+
+VALUE
+rb_concurrent_set_new(const struct rb_concurrent_set_funcs *funcs, int capacity)
+{
+    struct concurrent_set *set;
+    VALUE obj = TypedData_Make_Struct(0, struct concurrent_set, &concurrent_set_type, set);
+    set->funcs = funcs;
+    set->entries = ZALLOC_N(struct concurrent_set_entry, capacity);
+    set->capacity = capacity;
+    return obj;
+}
+
+rb_atomic_t
+rb_concurrent_set_size(VALUE set_obj)
+{
+    struct concurrent_set *set = RTYPEDDATA_GET_DATA(set_obj);
+
+    return RUBY_ATOMIC_LOAD(set->size);
+}
+
+struct concurrent_set_probe {
+    int idx;
+    int d;
+    int mask;
+};
+
+static int
+concurrent_set_probe_start(struct concurrent_set_probe *probe, struct concurrent_set *set, VALUE hash)
+{
+    RUBY_ASSERT((set->capacity & (set->capacity - 1)) == 0);
+    probe->d = 0;
+    probe->mask = set->capacity - 1;
+    probe->idx = hash & probe->mask;
+    return probe->idx;
+}
+
+static int
+concurrent_set_probe_next(struct concurrent_set_probe *probe)
+{
+    probe->d++;
+    probe->idx = (probe->idx + probe->d) & probe->mask;
+    return probe->idx;
+}
+
+static void
+concurrent_set_try_resize_without_locking(VALUE old_set_obj, VALUE *set_obj_ptr)
+{
+    // Check if another thread has already resized.
+    if (rbimpl_atomic_value_load(set_obj_ptr, RBIMPL_ATOMIC_ACQUIRE) != old_set_obj) {
+        return;
+    }
+
+    struct concurrent_set *old_set = RTYPEDDATA_GET_DATA(old_set_obj);
+
+    // This may overcount by up to the number of threads concurrently attempting to insert
+    // GC may also happen between now and the set being rebuilt
+    int expected_size = rbimpl_atomic_load(&old_set->size, RBIMPL_ATOMIC_RELAXED) - old_set->deleted_entries;
+
+    // NOTE: new capacity must make sense with load factor, don't change one without checking the other.
+    struct concurrent_set_entry *old_entries = old_set->entries;
+    int old_capacity = old_set->capacity;
+    int new_capacity = old_capacity * 2;
+    if (new_capacity > expected_size * 8) {
+        new_capacity = old_capacity / 2;
+    }
+    else if (new_capacity > expected_size * 4) {
+        new_capacity = old_capacity;
+    }
+
+    // May cause GC and therefore deletes, so must happen first.
+    VALUE new_set_obj = rb_concurrent_set_new(old_set->funcs, new_capacity);
+    struct concurrent_set *new_set = RTYPEDDATA_GET_DATA(new_set_obj);
+
+    for (int i = 0; i < old_capacity; i++) {
+        struct concurrent_set_entry *old_entry = &old_entries[i];
+        VALUE key = rbimpl_atomic_value_exchange(&old_entry->key, CONCURRENT_SET_MOVED, RBIMPL_ATOMIC_ACQUIRE);
+        RUBY_ASSERT(key != CONCURRENT_SET_MOVED);
+
+        if (key < CONCURRENT_SET_SPECIAL_VALUE_COUNT) continue;
+        if (!RB_SPECIAL_CONST_P(key) && rb_objspace_garbage_object_p(key)) continue;
+
+        VALUE hash = rbimpl_atomic_value_load(&old_entry->hash, RBIMPL_ATOMIC_RELAXED) & CONCURRENT_SET_HASH_MASK;
+        RUBY_ASSERT(hash != 0);
+        RUBY_ASSERT(hash == concurrent_set_hash(old_set, key));
+
+        // Insert key into new_set.
+        struct concurrent_set_probe probe;
+        int idx = concurrent_set_probe_start(&probe, new_set, hash);
+
+        while (true) {
+            struct concurrent_set_entry *entry = &new_set->entries[idx];
+
+            if (entry->hash == CONCURRENT_SET_EMPTY) {
+                RUBY_ASSERT(entry->key == CONCURRENT_SET_EMPTY);
+
+                new_set->size++;
+                RUBY_ASSERT(new_set->size <= new_set->capacity / 2);
+
+                entry->key = key;
+                entry->hash = hash;
+                break;
+            }
+
+            RUBY_ASSERT(entry->key >= CONCURRENT_SET_SPECIAL_VALUE_COUNT);
+            entry->hash |= CONCURRENT_SET_CONTINUATION_BIT;
+            idx = concurrent_set_probe_next(&probe);
+        }
+    }
+
+    rbimpl_atomic_value_store(set_obj_ptr, new_set_obj, RBIMPL_ATOMIC_RELEASE);
+
+    RB_GC_GUARD(old_set_obj);
+}
+
+static void
+concurrent_set_try_resize(VALUE old_set_obj, VALUE *set_obj_ptr)
+{
+    RB_VM_LOCKING() {
+        concurrent_set_try_resize_without_locking(old_set_obj, set_obj_ptr);
+    }
+}
+
+VALUE
+rb_concurrent_set_find(VALUE *set_obj_ptr, VALUE key)
+{
+    RUBY_ASSERT(key >= CONCURRENT_SET_SPECIAL_VALUE_COUNT);
+
+    VALUE set_obj;
+    VALUE hash = 0;
+    struct concurrent_set *set;
+    struct concurrent_set_probe probe;
+    int idx;
+
+  retry:
+    set_obj = rbimpl_atomic_value_load(set_obj_ptr, RBIMPL_ATOMIC_ACQUIRE);
+    RUBY_ASSERT(set_obj);
+    set = RTYPEDDATA_GET_DATA(set_obj);
+
+    if (hash == 0) {
+        // We don't need to recompute the hash on every retry because it should
+        // never change.
+        hash = concurrent_set_hash(set, key);
+    }
+    RUBY_ASSERT(hash == concurrent_set_hash(set, key));
+
+    idx = concurrent_set_probe_start(&probe, set, hash);
+
+    while (true) {
+        struct concurrent_set_entry *entry = &set->entries[idx];
+        VALUE curr_hash_and_flags = rbimpl_atomic_value_load(&entry->hash, RBIMPL_ATOMIC_ACQUIRE);
+        VALUE curr_hash = curr_hash_and_flags & CONCURRENT_SET_HASH_MASK;
+        bool continuation = curr_hash_and_flags & CONCURRENT_SET_CONTINUATION_BIT;
+
+        if (curr_hash_and_flags == CONCURRENT_SET_EMPTY) {
+            return 0;
+        }
+
+        if (curr_hash != hash) {
+            if (!continuation) {
+                return 0;
+            }
+            idx = concurrent_set_probe_next(&probe);
+            continue;
+        }
+
+        VALUE curr_key = rbimpl_atomic_value_load(&entry->key, RBIMPL_ATOMIC_ACQUIRE);
+
+        switch (curr_key) {
+          case CONCURRENT_SET_EMPTY:
+            // In-progress insert: hash written but key not yet
+            break;
+          case CONCURRENT_SET_DELETED:
+            break;
+          case CONCURRENT_SET_MOVED:
+            // Wait
+            RB_VM_LOCKING();
+
+            goto retry;
+          default: {
+            if (UNLIKELY(!RB_SPECIAL_CONST_P(curr_key) && rb_objspace_garbage_object_p(curr_key))) {
+                // This is a weakref set, so after marking but before sweeping is complete we may find a matching garbage object.
+                // Skip it and let the GC pass clean it up
+                break;
+            }
+
+            if (set->funcs->cmp(key, curr_key)) {
+                // We've found a match.
+                RB_GC_GUARD(set_obj);
+                return curr_key;
+            }
+
+            if (!continuation) {
+                return 0;
+            }
+
+            break;
+          }
+        }
+
+        idx = concurrent_set_probe_next(&probe);
+    }
+}
+
+VALUE
+rb_concurrent_set_find_or_insert(VALUE *set_obj_ptr, VALUE key, void *data)
+{
+    RUBY_ASSERT(key >= CONCURRENT_SET_SPECIAL_VALUE_COUNT);
+
+    // First attempt to find
+    {
+        VALUE result = rb_concurrent_set_find(set_obj_ptr, key);
+        if (result) return result;
+    }
+
+    // First time we need to call create, and store the hash
+    VALUE set_obj = rbimpl_atomic_value_load(set_obj_ptr, RBIMPL_ATOMIC_ACQUIRE);
+    RUBY_ASSERT(set_obj);
+
+    struct concurrent_set *set = RTYPEDDATA_GET_DATA(set_obj);
+    key = set->funcs->create(key, data);
+    VALUE hash = concurrent_set_hash(set, key);
+
+    struct concurrent_set_probe probe;
+    int idx;
+
+    goto start_search;
+
+retry:
+    // On retries we only need to load the hash object
+    set_obj = rbimpl_atomic_value_load(set_obj_ptr, RBIMPL_ATOMIC_ACQUIRE);
+    RUBY_ASSERT(set_obj);
+    set = RTYPEDDATA_GET_DATA(set_obj);
+
+    RUBY_ASSERT(hash == concurrent_set_hash(set, key));
+
+start_search:
+    idx = concurrent_set_probe_start(&probe, set, hash);
+
+    while (true) {
+        struct concurrent_set_entry *entry = &set->entries[idx];
+        VALUE curr_hash_and_flags = rbimpl_atomic_value_load(&entry->hash, RBIMPL_ATOMIC_ACQUIRE);
+        VALUE curr_hash = curr_hash_and_flags & CONCURRENT_SET_HASH_MASK;
+        bool continuation = curr_hash_and_flags & CONCURRENT_SET_CONTINUATION_BIT;
+
+        if (curr_hash_and_flags == CONCURRENT_SET_EMPTY) {
+            // Reserve this slot for our hash value
+            curr_hash_and_flags = rbimpl_atomic_value_cas(&entry->hash, CONCURRENT_SET_EMPTY, hash, RBIMPL_ATOMIC_RELEASE, RBIMPL_ATOMIC_RELAXED);
+            if (curr_hash_and_flags != CONCURRENT_SET_EMPTY) {
+                // Lost race, retry same slot to check winner's hash
+                continue;
+            }
+
+            // CAS succeeded, so these are the values stored
+            curr_hash_and_flags = hash;
+            curr_hash = hash;
+
+            // Fall through to try to claim key
+        }
+
+        if (curr_hash != hash) {
+            goto probe_next;
+        }
+
+        VALUE curr_key = rbimpl_atomic_value_load(&entry->key, RBIMPL_ATOMIC_ACQUIRE);
+
+        switch (curr_key) {
+          case CONCURRENT_SET_EMPTY: {
+            rb_atomic_t prev_size = rbimpl_atomic_fetch_add(&set->size, 1, RBIMPL_ATOMIC_RELAXED);
+
+            // Load_factor reached at 75% full. ex: prev_size: 32, capacity: 64, load_factor: 50%.
+            bool load_factor_reached = (uint64_t)(prev_size * 4) >= (uint64_t)(set->capacity * 3);
+
+            if (UNLIKELY(load_factor_reached)) {
+                concurrent_set_try_resize(set_obj, set_obj_ptr);
+                goto retry;
+            }
+
+            VALUE prev_key = rbimpl_atomic_value_cas(&entry->key, CONCURRENT_SET_EMPTY, key, RBIMPL_ATOMIC_RELEASE, RBIMPL_ATOMIC_RELAXED);
+            if (prev_key == CONCURRENT_SET_EMPTY) {
+                RUBY_ASSERT(rb_concurrent_set_find(set_obj_ptr, key) == key);
+                RB_GC_GUARD(set_obj);
+                return key;
+            }
+            else {
+                // Entry was not inserted.
+                rbimpl_atomic_sub(&set->size, 1, RBIMPL_ATOMIC_RELAXED);
+
+                // Another thread won the race, try again at the same location.
+                continue;
+            }
+          }
+          case CONCURRENT_SET_DELETED:
+            break;
+          case CONCURRENT_SET_MOVED:
+            // Wait
+            RB_VM_LOCKING();
+            goto retry;
+          default:
+            // We're never GC during our search
+            // If the continuation bit wasn't set at the start of our search,
+            // any concurrent find with the same hash value would also look at
+            // this location and try to swap curr_key
+            if (UNLIKELY(!RB_SPECIAL_CONST_P(curr_key) && rb_objspace_garbage_object_p(curr_key))) {
+                if (continuation) {
+                    goto probe_next;
+                }
+                rbimpl_atomic_value_cas(&entry->key, curr_key, CONCURRENT_SET_EMPTY, RBIMPL_ATOMIC_RELEASE, RBIMPL_ATOMIC_RELAXED);
+                continue;
+            }
+
+            if (set->funcs->cmp(key, curr_key)) {
+                // We've found a live match.
+                RB_GC_GUARD(set_obj);
+
+                // We created key using set->funcs->create, but we didn't end
+                // up inserting it into the set. Free it here to prevent memory
+                // leaks.
+                if (set->funcs->free) set->funcs->free(key);
+
+                return curr_key;
+            }
+            break;
+        }
+
+      probe_next:
+        RUBY_ASSERT(curr_hash_and_flags != CONCURRENT_SET_EMPTY);
+        concurrent_set_mark_continuation(entry, curr_hash_and_flags);
+        idx = concurrent_set_probe_next(&probe);
+    }
+}
+
+static void
+concurrent_set_delete_entry_locked(struct concurrent_set *set, struct concurrent_set_entry *entry)
+{
+    ASSERT_vm_locking_with_barrier();
+
+    if (entry->hash & CONCURRENT_SET_CONTINUATION_BIT) {
+        entry->hash = CONCURRENT_SET_CONTINUATION_BIT;
+        entry->key = CONCURRENT_SET_DELETED;
+        set->deleted_entries++;
+    }
+    else {
+        entry->hash = CONCURRENT_SET_EMPTY;
+        entry->key = CONCURRENT_SET_EMPTY;
+        set->size--;
+    }
+}
+
+VALUE
+rb_concurrent_set_delete_by_identity(VALUE set_obj, VALUE key)
+{
+    ASSERT_vm_locking_with_barrier();
+
+    struct concurrent_set *set = RTYPEDDATA_GET_DATA(set_obj);
+
+    VALUE hash = concurrent_set_hash(set, key);
+
+    struct concurrent_set_probe probe;
+    int idx = concurrent_set_probe_start(&probe, set, hash);
+
+    while (true) {
+        struct concurrent_set_entry *entry = &set->entries[idx];
+        VALUE curr_key = entry->key;
+
+        switch (curr_key) {
+          case CONCURRENT_SET_EMPTY:
+            // We didn't find our entry to delete.
+            return 0;
+          case CONCURRENT_SET_DELETED:
+            break;
+          case CONCURRENT_SET_MOVED:
+            rb_bug("rb_concurrent_set_delete_by_identity: moved entry");
+            break;
+          default:
+            if (key == curr_key) {
+                RUBY_ASSERT((entry->hash & CONCURRENT_SET_HASH_MASK) == hash);
+                concurrent_set_delete_entry_locked(set, entry);
+                return curr_key;
+            }
+            break;
+        }
+
+        idx = concurrent_set_probe_next(&probe);
+    }
+}
+
+void
+rb_concurrent_set_foreach_with_replace(VALUE set_obj, int (*callback)(VALUE *key, void *data), void *data)
+{
+    ASSERT_vm_locking_with_barrier();
+
+    struct concurrent_set *set = RTYPEDDATA_GET_DATA(set_obj);
+
+    for (unsigned int i = 0; i < set->capacity; i++) {
+        struct concurrent_set_entry *entry = &set->entries[i];
+        VALUE key = entry->key;
+
+        switch (key) {
+          case CONCURRENT_SET_EMPTY:
+          case CONCURRENT_SET_DELETED:
+            continue;
+          case CONCURRENT_SET_MOVED:
+            rb_bug("rb_concurrent_set_foreach_with_replace: moved entry");
+            break;
+          default: {
+            int ret = callback(&entry->key, data);
+            switch (ret) {
+              case ST_STOP:
+                return;
+              case ST_DELETE:
+                concurrent_set_delete_entry_locked(set, entry);
+                break;
+            }
+            break;
+          }
+        }
+    }
+}
diff --git a/configure.ac b/configure.ac
index 2b25d7b069..4e7367804d 100644
--- a/configure.ac
+++ b/configure.ac
@@ -9,48 +9,69 @@ tooldir="$srcdir/tool"
 
 AC_DISABLE_OPTION_CHECKING
 
-m4_include([tool/m4/_colorize_result_prepare.m4])dnl
-m4_include([tool/m4/ac_msg_result.m4])dnl
-m4_include([tool/m4/colorize_result.m4])dnl
-m4_include([tool/m4/ruby_append_option.m4])dnl
-m4_include([tool/m4/ruby_append_options.m4])dnl
-m4_include([tool/m4/ruby_check_builtin_func.m4])dnl
-m4_include([tool/m4/ruby_check_builtin_setjmp.m4])dnl
-m4_include([tool/m4/ruby_check_printf_prefix.m4])dnl
-m4_include([tool/m4/ruby_check_setjmp.m4])dnl
-m4_include([tool/m4/ruby_check_signedness.m4])dnl
-m4_include([tool/m4/ruby_check_sizeof.m4])dnl
-m4_include([tool/m4/ruby_check_sysconf.m4])dnl
-m4_include([tool/m4/ruby_cppoutfile.m4])dnl
-m4_include([tool/m4/ruby_decl_attribute.m4])dnl
-m4_include([tool/m4/ruby_default_arch.m4])dnl
-m4_include([tool/m4/ruby_define_if.m4])dnl
-m4_include([tool/m4/ruby_defint.m4])dnl
-m4_include([tool/m4/ruby_dtrace_available.m4])dnl
-m4_include([tool/m4/ruby_dtrace_postprocess.m4])dnl
-m4_include([tool/m4/ruby_func_attribute.m4])dnl
-m4_include([tool/m4/ruby_mingw32.m4])dnl
-m4_include([tool/m4/ruby_prepend_option.m4])dnl
-m4_include([tool/m4/ruby_prog_gnu_ld.m4])dnl
-m4_include([tool/m4/ruby_replace_funcs.m4])dnl
-m4_include([tool/m4/ruby_replace_type.m4])dnl
-m4_include([tool/m4/ruby_require_funcs.m4])dnl
-m4_include([tool/m4/ruby_rm_recursive.m4])dnl
-m4_include([tool/m4/ruby_setjmp_type.m4])dnl
-m4_include([tool/m4/ruby_stack_grow_direction.m4])dnl
-m4_include([tool/m4/ruby_thread.m4])dnl
-m4_include([tool/m4/ruby_try_cflags.m4])dnl
-m4_include([tool/m4/ruby_try_cxxflags.m4])dnl
-m4_include([tool/m4/ruby_try_ldflags.m4])dnl
-m4_include([tool/m4/ruby_universal_arch.m4])dnl
-m4_include([tool/m4/ruby_wasm_tools.m4])dnl
-m4_include([tool/m4/ruby_werror_flag.m4])dnl
+m4_define([RUBY_M4_INCLUDED], [])dnl
+AC_DEFUN([RUBY_M4_INCLUDE], [m4_include([tool/m4/$1])dnl
+  m4_append([RUBY_M4_INCLUDED], [ \
+	$(tooldir)/m4/$1])dnl
+])
+RUBY_M4_INCLUDE([_colorize_result_prepare.m4])dnl
+RUBY_M4_INCLUDE([ac_msg_result.m4])dnl
+RUBY_M4_INCLUDE([colorize_result.m4])dnl
+RUBY_M4_INCLUDE([ruby_append_option.m4])dnl
+RUBY_M4_INCLUDE([ruby_append_options.m4])dnl
+RUBY_M4_INCLUDE([ruby_check_builtin_func.m4])dnl
+RUBY_M4_INCLUDE([ruby_check_builtin_overflow.m4])dnl
+RUBY_M4_INCLUDE([ruby_check_builtin_setjmp.m4])dnl
+RUBY_M4_INCLUDE([ruby_check_header.m4])dnl
+RUBY_M4_INCLUDE([ruby_check_printf_prefix.m4])dnl
+RUBY_M4_INCLUDE([ruby_check_setjmp.m4])dnl
+RUBY_M4_INCLUDE([ruby_check_signedness.m4])dnl
+RUBY_M4_INCLUDE([ruby_check_sizeof.m4])dnl
+RUBY_M4_INCLUDE([ruby_check_sysconf.m4])dnl
+RUBY_M4_INCLUDE([ruby_cppoutfile.m4])dnl
+RUBY_M4_INCLUDE([ruby_decl_attribute.m4])dnl
+RUBY_M4_INCLUDE([ruby_default_arch.m4])dnl
+RUBY_M4_INCLUDE([ruby_define_if.m4])dnl
+RUBY_M4_INCLUDE([ruby_defint.m4])dnl
+RUBY_M4_INCLUDE([ruby_dtrace_available.m4])dnl
+RUBY_M4_INCLUDE([ruby_dtrace_postprocess.m4])dnl
+RUBY_M4_INCLUDE([ruby_func_attribute.m4])dnl
+RUBY_M4_INCLUDE([ruby_mingw32.m4])dnl
+RUBY_M4_INCLUDE([ruby_prepend_option.m4])dnl
+RUBY_M4_INCLUDE([ruby_prog_gnu_ld.m4])dnl
+RUBY_M4_INCLUDE([ruby_prog_makedirs.m4])dnl
+RUBY_M4_INCLUDE([ruby_replace_funcs.m4])dnl
+RUBY_M4_INCLUDE([ruby_replace_type.m4])dnl
+RUBY_M4_INCLUDE([ruby_require_funcs.m4])dnl
+RUBY_M4_INCLUDE([ruby_rm_recursive.m4])dnl
+RUBY_M4_INCLUDE([ruby_setjmp_type.m4])dnl
+RUBY_M4_INCLUDE([ruby_modular_gc.m4])dnl
+RUBY_M4_INCLUDE([ruby_stack_grow_direction.m4])dnl
+RUBY_M4_INCLUDE([ruby_thread.m4])dnl
+RUBY_M4_INCLUDE([ruby_try_cflags.m4])dnl
+RUBY_M4_INCLUDE([ruby_try_cxxflags.m4])dnl
+RUBY_M4_INCLUDE([ruby_try_ldflags.m4])dnl
+RUBY_M4_INCLUDE([ruby_universal_arch.m4])dnl
+RUBY_M4_INCLUDE([ruby_wasm_tools.m4])dnl
+RUBY_M4_INCLUDE([ruby_werror_flag.m4])dnl
+
+AS_IF([test "x${GITHUB_ACTIONS}" = xtrue],
+[AC_REQUIRE([_COLORIZE_RESULT_PREPARE])dnl
+dnl 93(bright yellow) is copied from .github/workflows/mingw.yml
+    begin_group() { AS_ECHO(["::group::@<:@93m$[]1@<:@m"]);}
+    end_group() { AS_ECHO(["::endgroup::"]);}
+],
+[dnl
+    begin_group() { :;}
+    end_group() { :;}
+])
 
 AC_ARG_VAR([cflags], [additional CFLAGS (ignored when CFLAGS is given)])dnl
 AC_ARG_VAR([cppflags], [additional CPPFLAGS (ignored when CPPFLAGS is given)])dnl
 AC_ARG_VAR([cxxflags], [additional CXXFLAGS (ignored when CXXFLAGS is given)])dnl
+AC_ARG_VAR([rustc_flags], [additional RUSTC_FLAGS])dnl
 
-: "environment section" && {
+[begin]_group "environment section" && {
 HAVE_BASERUBY=yes
 BASERUBY_VERSION=
 AC_ARG_WITH(baseruby,
@@ -62,14 +83,30 @@ AC_ARG_WITH(baseruby,
 	],
 	[
 		AC_PATH_PROG([BASERUBY], [ruby], [false])
+		HAVE_BASERUBY=
 	])
-AS_IF([test "$HAVE_BASERUBY" != no -a "`RUBYOPT=- $BASERUBY --disable=gems -e 'print 42 if RUBY_VERSION > "2.2"' 2>/dev/null`" = 42], [
-    BASERUBY="$BASERUBY --disable=gems"
+AS_IF([test "$HAVE_BASERUBY" = no], [
+    # --without-baseruby
+], [error=`RUBYOPT=- $BASERUBY --disable=gems "${tooldir}/missing-baseruby.bat" --verbose 2>&1`], [
+    HAVE_BASERUBY=yes
+], [test "$HAVE_BASERUBY" = ""], [ # no --with-baseruby option
+    AC_MSG_WARN($error)            # just warn and continue
+    HAVE_BASERUBY=no
+], [                               # the ruby given by --with-baseruby is too old
+    AC_MSG_ERROR($error)           # bail out
+])
+AS_IF([test "${HAVE_BASERUBY:=no}" != no], [
+    AS_CASE(["$build_os"], [mingw*], [
+        # Can MSys shell run a command with a drive letter?
+        RUBYOPT=- `cygpath -ma "$BASERUBY"` --disable=gems -e exit 2>/dev/null || HAVE_BASERUBY=no
+    ])
+    RUBY_APPEND_OPTION(BASERUBY, "--disable=gems")
     BASERUBY_VERSION=`$BASERUBY -v`
     $BASERUBY -C "$srcdir" tool/downloader.rb -d tool -e gnu config.guess config.sub >&AS_MESSAGE_FD
-], [
-    BASERUBY="echo executable host ruby is required.  use --with-baseruby option.; false"
-    HAVE_BASERUBY=no
+])
+AS_IF([test "$HAVE_BASERUBY" = no], [
+    AS_IF([test "$cross_compiling" = yes], [AC_MSG_ERROR([executable host ruby is required for cross-compiling])])
+    BASERUBY=${tooldir}/missing-baseruby.bat
 ])
 AC_SUBST(BASERUBY)
 AC_SUBST(HAVE_BASERUBY)
@@ -79,15 +116,25 @@ HAVE_GIT=yes
 AC_ARG_WITH(git,
 	AS_HELP_STRING([--without-git], [never use git]),
 	[AS_CASE([$withval],
-	    [no],  [GIT=never-use HAVE_GIT=no],
+	    [no],  [HAVE_GIT=no],
 	    [yes], [],
 	    [GIT=$withval])])
-AS_IF([test x"$HAVE_GIT" = xyes], [command -v "$GIT" > /dev/null || HAVE_GIT=no])
+{
+    test x"$HAVE_GIT" = xyes &&
+    command -v "$GIT" > /dev/null &&
+    # `git -C`: 1.8.5
+    # `git log --no-show-signature`: 2.10.0
+    AS_CASE([`$GIT -C . --version 2> /dev/null | sed 's/.* //'`],
+    [0.*|1.*|2.@<:@0-9@:>@.*], [false],
+    [true])
+} || HAVE_GIT=no GIT=never-use
 AC_SUBST(GIT)
 AC_SUBST(HAVE_GIT)
 
 eval `sed -n -e ['s/^@%:@define RUBY_[A-Z_]*VERSION_\([A-Z][A-Z][A-Z_0-9]*\) \([0-9][0-9]*\)$/\1=\2/p'] \
+      -e ['s/^@%:@define \(RUBY_ABI_VERSION\) \([0-9][0-9]*\).*/\1=\2/p'] \
       -e ['s/^@%:@define \(RUBY_PATCHLEVEL\) \(.*\)/\1=\2/p'] \
+     $srcdir/include/ruby/internal/abi.h \
      $srcdir/include/ruby/version.h $srcdir/version.h`
 for v in MAJOR MINOR TEENY; do
     AS_IF([eval "test \"\$$v\" = ''"], [
@@ -99,6 +146,9 @@ AC_SUBST(MINOR)
 AC_SUBST(TEENY)
 AC_SUBST(RUBY_API_VERSION, '$(MAJOR).$(MINOR)')
 AC_SUBST(RUBY_PROGRAM_VERSION, '$(MAJOR).$(MINOR).$(TEENY)')
+AS_CASE([$RUBY_PATCHLEVEL], [-*], [
+    AC_DEFINE_UNQUOTED(RUBY_ABI_VERSION, [${RUBY_ABI_VERSION}])
+], [RUBY_ABI_VERSION=])
 
 AS_IF([test "$program_prefix" = NONE], [
   program_prefix=
@@ -116,12 +166,16 @@ dnl checks for alternative programs
 AC_CANONICAL_BUILD
 AC_CANONICAL_HOST
 AC_CANONICAL_TARGET
+AC_SUBST(config_target, $target)
 AS_CASE(["$target_cpu-$target_os"],
     [aarch64-darwin*], [
         target_cpu=arm64
-        AS_CASE(["$target_vendor"], [unknown], [target_vendor=apple target=${target/-unknown-/-apple-}])
-        target="${target/aarch64/arm64}"
-        target_alias="${target_alias/aarch64/arm64}"
+        AS_CASE(["$target_vendor"], [unknown], [
+            target_vendor=apple
+            target=${target%%-unknown-*}-apple-${target@%:@*-unknown-}
+        ])
+        target="arm64-${target@%:@aarch64-}"
+        AS_IF([test -n "$target_alias"], [target_alias="arm64-${target_alias@%:@aarch64-}"])
     ])
 
 AC_ARG_PROGRAM
@@ -171,7 +225,7 @@ AC_ARG_VAR([STRIP],    [Strip command])
 set rb_dummy ${CC}
 rb_CC=$2
 AC_DEFUN([RUBY_CHECK_PROG_FOR_CC], [
-    rb_prog=`echo "${rb_CC}" | sed "$2"`
+    rb_prog=`echo "${rb_CC}" | sed ["s:$2\([^/]*\)$:$3\1:"]`
     AC_CHECK_PROG([$1], [$rb_prog], [$rb_prog])
 ])
 AS_CASE(["/${rb_CC} "],
@@ -182,30 +236,38 @@ AS_CASE(["/${rb_CC} "],
 [*icc*],              [
     # Intel C++ has interprocedural optimizations.  It tends to come with its
     # own linker etc.
-    RUBY_CHECK_PROG_FOR_CC([AR],      [s/icc/xiar/])
-    RUBY_CHECK_PROG_FOR_CC([CXX],     [s/icc/icpc/])
-    RUBY_CHECK_PROG_FOR_CC([LD],      [s/icc/xild/])
+    RUBY_CHECK_PROG_FOR_CC([AR],      [icc], [xiar])
+    RUBY_CHECK_PROG_FOR_CC([CXX],     [icc], [icpc])
+    RUBY_CHECK_PROG_FOR_CC([LD],      [icc], [xild])
 ],
 [*gcc*],              [
     # Ditto for GCC.
-    RUBY_CHECK_PROG_FOR_CC([LD],      [s/gcc/ld/])
-    RUBY_CHECK_PROG_FOR_CC([AR],      [s/gcc/gcc-ar/])
-    RUBY_CHECK_PROG_FOR_CC([CXX],     [s/gcc/g++/])
-    RUBY_CHECK_PROG_FOR_CC([NM],      [s/gcc/gcc-nm/])
-    RUBY_CHECK_PROG_FOR_CC([RANLIB],  [s/gcc/gcc-ranlib/])
+    RUBY_CHECK_PROG_FOR_CC([LD],      [gcc], [ld])
+    RUBY_CHECK_PROG_FOR_CC([AR],      [gcc], [gcc-ar])
+    RUBY_CHECK_PROG_FOR_CC([CXX],     [gcc], [g++])
+    RUBY_CHECK_PROG_FOR_CC([NM],      [gcc], [gcc-nm])
+    RUBY_CHECK_PROG_FOR_CC([RANLIB],  [gcc], [gcc-ranlib])
 ],
 [*clang*],            [
     # Ditto for LLVM.  Note however that llvm-as is a LLVM-IR to LLVM bitcode
     # assembler that does not target your machine native binary.
-    : ${LD:="${CC}"}         # ... try -fuse-ld=lld ?
-    RUBY_CHECK_PROG_FOR_CC([AR],      [s/clang/llvm-ar/])
-#   RUBY_CHECK_PROG_FOR_CC([AS],      [s/clang/llvm-as/])
-    RUBY_CHECK_PROG_FOR_CC([CXX],     [s/clang/clang++/])
-    RUBY_CHECK_PROG_FOR_CC([NM],      [s/clang/llvm-nm/])
-    RUBY_CHECK_PROG_FOR_CC([OBJCOPY], [s/clang/llvm-objcopy/])
-    RUBY_CHECK_PROG_FOR_CC([OBJDUMP], [s/clang/llvm-objdump/])
-    RUBY_CHECK_PROG_FOR_CC([RANLIB],  [s/clang/llvm-ranlib/])
-    RUBY_CHECK_PROG_FOR_CC([STRIP],   [s/clang/llvm-strip/])
+
+    # Xcode has its own version tools that may be incompatible with
+    # genuine LLVM tools, use the tools in the same directory.
+
+    AS_IF([$rb_CC -E -dM -xc - < /dev/null | grep -F __apple_build_version__ > /dev/null],
+          [llvm_prefix=], [llvm_prefix=llvm-])
+    # AC_PREPROC_IFELSE cannot be used before AC_USE_SYSTEM_EXTENSIONS
+
+    RUBY_CHECK_PROG_FOR_CC([LD],      [clang], [ld]) # ... maybe try lld ?
+    RUBY_CHECK_PROG_FOR_CC([AR],      [clang], [${llvm_prefix}ar])
+#   RUBY_CHECK_PROG_FOR_CC([AS],      [clang], [${llvm_prefix}as])
+    RUBY_CHECK_PROG_FOR_CC([CXX],     [clang], [clang++])
+    RUBY_CHECK_PROG_FOR_CC([NM],      [clang], [${llvm_prefix}nm])
+    RUBY_CHECK_PROG_FOR_CC([OBJCOPY], [clang], [${llvm_prefix}objcopy])
+    RUBY_CHECK_PROG_FOR_CC([OBJDUMP], [clang], [${llvm_prefix}objdump])
+    RUBY_CHECK_PROG_FOR_CC([RANLIB],  [clang], [${llvm_prefix}ranlib])
+    RUBY_CHECK_PROG_FOR_CC([STRIP],   [clang], [${llvm_prefix}strip])
 ])
 AS_UNSET(rb_CC)
 AS_UNSET(rb_dummy)
@@ -218,7 +280,9 @@ AS_CASE(["${build_os}"],
     AC_PATH_TOOL([NM], [nm], [/usr/ccs/bin/nm], [/usr/ccs/bin:$PATH])
 ])
 AS_CASE(["${target_os}"],
-[cygwin*|msys*|mingw*], [
+[cygwin*|msys*|mingw*|darwin*], [
+    ac_ct_OBJCOPY=":"
+    ac_cv_prog_OBJCOPY=":"
     ac_cv_prog_ac_ct_OBJCOPY=":"
 ])
 
@@ -237,10 +301,16 @@ AC_CHECK_TOOLS([AR],      [gar ar])
 AC_CHECK_TOOLS([AS],      [gas as])
 AC_CHECK_TOOLS([LD],      [gld ld]) # ... try gold ?
 AC_CHECK_TOOLS([NM],      [gnm nm])
-AC_CHECK_TOOLS([OBJCOPY], [gobjcopy objcopy])
+AC_CHECK_TOOLS([OBJCOPY], [gobjcopy objcopy], [:])
 AC_CHECK_TOOLS([OBJDUMP], [gobjdump objdump])
 AC_CHECK_TOOLS([STRIP],   [gstrip strip], [:])
 
+FIRSTMAKEFILE=""
+
+# nm errors with Rust's LLVM bitcode when Rust uses a newer LLVM version than nm.
+# In case we're working with llvm-nm, tell it to not worry about the bitcode.
+AS_IF([${NM} --help 2>&1 | grep -q 'llvm-bc'], [NM="$NM --no-llvm-bc"])
+
 AS_IF([test ! $rb_test_CFLAGS], [AS_UNSET(CFLAGS)]); AS_UNSET(rb_test_CFLAGS)
 AS_IF([test ! $rb_test_CXXFLAGS], [AS_UNSET(CXXFLAGS)]); AS_UNSET(rb_save_CXXFLAGS)
 
@@ -313,7 +383,7 @@ test -z "$warnflags" ||
 AS_IF([test -z "${CFLAGS+set}"], [
     cflags=`echo " $cflags " | sed "$cflagspat;s/^ *//;s/ *$//"`
     orig_cflags="$cflags"
-    cflags="$cflags "'${optflags} ${debugflags} ${warnflags}'
+    cflags='${hardenflags} '"$cflags "'${optflags} ${debugflags} ${warnflags}'
 ])
 dnl AS_IF([test -z "${CXXFLAGS+set}"], [
 dnl     cxxflags=`echo " $cxxflags " | sed "$cflagspat;s/^ *//;s/ *$//"`
@@ -346,10 +416,9 @@ AS_CASE(["$target_os"],
 	[!<===== pre OS X 10.5 =====>]
 	@%:@endif
 	]])],
-	[macosx_min_required=yes],
+	[AC_MSG_RESULT(yes)],
 	[AC_MSG_RESULT(no)
 	AC_MSG_ERROR([Unsupported OS X version is required])])
-    AC_MSG_RESULT(${macosx_min_required})
 ])
 
 RUBY_MINGW32
@@ -365,14 +434,14 @@ AS_IF([test "$GCC" = yes], [
     icc_version=`echo =__ICC | $CC -E -xc - | sed '/^=/!d;s///;/^__ICC/d'`
     test -n "$icc_version" || icc_version=0
     # RUBY_APPEND_OPTIONS(XCFLAGS, ["-include ruby/config.h" "-include ruby/missing.h"])
+
+    AS_IF([test "$gcc_major" -lt 4], [
+        AC_MSG_ERROR([too old GCC: $gcc_major.$gcc_minor])
+    ])
 ], [
     linker_flag=
 ])
 
-AS_IF([test "$GCC" = yes -a "$gcc_major" -lt 3 ], [
-    AC_MSG_ERROR([too old GCC])
-])
-
 RUBY_PROG_GNU_LD
 RUBY_CPPOUTFILE
 
@@ -383,33 +452,26 @@ AC_SUBST(OUTFLAG)
 AC_SUBST(COUTFLAG)
 AC_SUBST(CSRCFLAG)
 
-: ${MJIT_CC=$CC}
-AS_IF([test "x$cross_compiling" = xno], [
-    AC_PATH_PROG([MJIT_CC], ${MJIT_CC})
-
-    # if $CC is in /usr/lib/ccache/$CC, search original $CC (disable ccache)
-    AS_IF([echo $RUBY_DEBUG | grep ci > /dev/null &&
-           echo $MJIT_CC | grep ^/usr/lib/ccache > /dev/null], [
-           PATH=`echo $PATH | sed "s/\/usr\/lib\/ccache://"` MJIT_CC=`which $CC`])
-
-    AS_CASE([$target_os],
-	[*mingw*], [command -v cygpath > /dev/null && MJIT_CC=`cygpath -ma $MJIT_CC`])
-    shift 2
-    MJIT_CC="$MJIT_CC${1+ }$*"
-])
-
 AS_CASE(["$build_os"],
-  [darwin1*.*], [
+  [darwin*], [
+    # gcc 13 warns duplicate -l options, which are added by the
+    # default spec.
     # Xcode linker warns for deprecated architecture and wrongly
     # installed TBD files.
-    CC_WRAPPER=""
+    AC_MSG_CHECKING(for $CC linker warning)
+    suppress_ld_waring=no
     echo 'int main(void) {return 0;}' > conftest.c
     AS_IF([$CC -framework Foundation -o conftest conftest.c 2>&1 |
-	   grep '^ld: warning: text-based stub file' >/dev/null], [
-	CC_WRAPPER=`cd -P "${tooldir}" && pwd`/darwin-cc
-	CC="$CC_WRAPPER $CC"
+	   grep \
+	      -e '^ld: warning: ignoring duplicate libraries:' \
+	      -e '^ld: warning: text-based stub file' \
+	      -e '^ld: warning: -multiply_defined is obsolete' \
+	   >/dev/null], [
+	suppress_ld_waring=yes
     ])
     rm -fr conftest*
+    test $suppress_ld_waring = yes && warnflags="${warnflags:+${warnflags} }-Wl,-w"
+    AC_MSG_RESULT($suppress_ld_waring)
   ])
 AS_CASE(["$target_os"],
   [wasi*], [
@@ -419,6 +481,8 @@ AS_CASE(["$target_os"],
     # so wrap clang to insert our fake wasm-opt, which does nothing, in PATH.
     CC_WRAPPER=`cd -P "${tooldir}" && pwd`/wasm-clangw
     CC="$CC_WRAPPER $CC"
+
+    FIRSTMAKEFILE=GNUmakefile:wasm/GNUmakefile.in
   ])
 
 cc_version=
@@ -436,8 +500,8 @@ AC_SUBST(CC_VERSION_MESSAGE, $cc_version_message)
 : ${DLDFLAGS="$LDFLAGS"}
 
 RUBY_UNIVERSAL_ARCH
-AS_IF([test "$target_cpu" != "$host_cpu" -a "$GCC" = yes -a "$cross_compiling" = no -a "${universal_binary:-no}" = no], [
-    RUBY_DEFAULT_ARCH("$target_cpu")
+AS_IF([test "$target_cpu" != "$host_cpu" -a "$GCC" = yes -a "${universal_binary:-no}" = no], [
+    RUBY_DEFAULT_ARCH($target_cpu)
 ])
 host_os=$target_os
 host_vendor=$target_vendor
@@ -450,7 +514,6 @@ AC_CACHE_CHECK([for $AR flags], [rb_cv_arflags], [
 	[rb_cv_arflags=rcD], [rb_cv_arflags=rcu])
 ])
 AC_SUBST(ARFLAGS, ["$rb_cv_arflags "])
-AC_SUBST(ASFLAGS)
 
 AS_CASE(["$target_os"],
 [cygwin*|msys*|mingw*], [
@@ -461,6 +524,8 @@ AS_CASE(["$target_os"],
     target_cpu=`echo $target_cpu | sed s/i.86/i386/`
     AS_CASE(["$target"], [-*], [ target="$target_cpu${target}"])
     AS_CASE(["$target_alias"], [-*], [ target_alias="$target_cpu${target_alias}"])
+    # cygwin/GNUmakefile.in is not exclusively for cygwin.
+    FIRSTMAKEFILE=GNUmakefile:cygwin/GNUmakefile.in
     AS_CASE(["$target_os"],
     [mingw*], [
 	test "$rb_cv_msvcrt" = "" && unset rb_cv_msvcrt
@@ -479,6 +544,7 @@ AS_CASE(["$target_os"],
 	AC_DEFINE_UNQUOTED(RUBY_MSVCRT_VERSION, $RT_VER)
 	sysconfdir=
     ])
+    rb_cv_binary_elf=no
     : ${enable_shared=yes}
     ],
 [hiuxmpp*], [AC_DEFINE(__HIUX_MPP__)])    # by TOYODA Eizi <toyoda@npd.kishou.go.jp>
@@ -486,17 +552,12 @@ AS_CASE(["$target_os"],
 AC_PROG_LN_S
 AC_PROG_MAKE_SET
 AC_PROG_INSTALL
-AC_PROG_MKDIR_P
-AS_IF([test "x$MKDIR_P" = "x -d"], [
-  AS_IF([test x"$as_mkdir_p" != xfalse], [
-    MKDIR_P='mkdir -p'
-    echo "use 'mkdir -p' as MKDIR_P"
-  ], [
-    AC_MSG_ERROR([mkdir -p is required])
-  ])
+
+AS_CASE(["$target_os"],[openbsd*],[
+    ac_cv_path_mkdir="mkdir"
 ])
-MAKEDIRS="$MKDIR_P"
-AC_SUBST(MAKEDIRS)
+
+RUBY_PROG_MAKEDIRS
 
 AC_CHECK_PROG([DTRACE], [${ac_tool_prefix}dtrace], [${ac_tool_prefix}dtrace])
 AS_IF([test "$cross_compiling:$ac_cv_prog_DTRACE" = no: -a -n "$ac_tool_prefix"], [
@@ -506,11 +567,16 @@ AS_IF([test "$cross_compiling:$ac_cv_prog_DTRACE" = no: -a -n "$ac_tool_prefix"]
 AC_CHECK_PROGS(DOT, dot)
 AC_CHECK_PROGS(DOXYGEN, doxygen)
 
-for prog in ${ac_tool_prefix:+${ac_tool_prefix}pkg-config} pkg-config; do
-    AC_CHECK_PROG(PKG_CONFIG, $prog, [$prog], [], [],
-        [`"$as_dir/$ac_word$ac_exec_ext" --print-errors --version > /dev/null 2>&1 || echo "$as_dir/$ac_word$ac_exec_ext"`])
-    test -z "${PKG_CONFIG}" || break
-done
+tool_warned=$ac_tool_warned ac_tool_warned=no
+AC_CHECK_TOOL(PKG_CONFIG, pkg-config)
+ac_tool_warned=$tool_warned
+AS_IF([test -z "$PKG_CONFIG"], [],
+["$PKG_CONFIG" --print-errors --version > /dev/null 2>&1], [],
+[
+    unset ac_cv_prog_PKG_CONFIG
+    PKG_CONFIG=
+    AC_MSG_WARN([$PKG_CONFIG does not work; ignore])
+])
 
 AC_MSG_CHECKING([whether it is Android])
 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
@@ -561,9 +627,25 @@ AS_IF([test -f conf$$.dir/src/cdcmd], [
 rm -fr conf$$.dir
 AC_MSG_RESULT([$CHDIR])
 AC_SUBST(CHDIR)
+
+AS_CASE(["$FIRSTMAKEFILE"], [*GNUmakefile:*], [gnumake=yes], [
+    AC_MSG_CHECKING([if ${MAKE-make} is GNU make])
+    mkdir conftest.dir
+    echo "all:; @echo yes" > conftest.dir/GNUmakefile
+    echo "all:; @echo no" > conftest.dir/Makefile
+    gnumake=`(cd conftest.dir; ${MAKE-make})`
+    rm -fr conftest.dir
+    AS_CASE(["$gnumake"],
+    [*yes*], [
+	FIRSTMAKEFILE=GNUmakefile:template/GNUmakefile.in
+	gnumake=yes],
+    [
+	gnumake=no])
+    AC_MSG_RESULT($gnumake)
+])
 }
 
-: "compiler section" && {
+[begin]_group "compiler section" && {
 RUBY_WERROR_FLAG([
     AC_MSG_CHECKING([whether CFLAGS is valid])
     AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[]], [[]])],
@@ -593,22 +675,39 @@ RUBY_WERROR_FLAG([
     cd .. && rm -fr tmp.$$.try_link
 ])
 
-: ${RPATHFLAG=''}
-rpathflag=''
-AS_IF([test x"${RPATHFLAG}" = x], [
-    AS_CASE(["$target_os"],
+: "rpath" && {
+    AC_CACHE_CHECK(whether ELF binaries are produced, rb_cv_binary_elf,
+        [AC_LINK_IFELSE([AC_LANG_PROGRAM([[]], [[]])],[
+            AS_CASE(["`head -1 conftest$EXEEXT | tr -dc '\177ELF' | tr '\177' .`"],
+            [.ELF*], [rb_cv_binary_elf=yes], [rb_cv_binary_elf=no])],
+            [rb_cv_binary_elf=no])])
+
+    rpathflag=''
+    AS_IF([test x"${RPATHFLAG=}" = x], [
+	AS_CASE(["$target_os"],
 	[aix*], [rpathflag='-blibpath:'],
-	[for rpathflag in -R "-rpath "; do
+	[for rpathflag in "-rpath " -R; do
 	    AS_CASE("$rpathflag",
 		    [*" "], [AS_CASE(["${linker_flag}"],
 				     [*,], [rpathflag=`echo "$rpathflag" | tr ' ' ,`])])
 	    rpathflag="${linker_flag}${rpathflag}"
 	    RUBY_TRY_LDFLAGS([${rpathflag}.], [], [rpathflag=])
-	    AS_IF([test "x${rpathflag}" != x], [])
+	    AS_IF([test "x${rpathflag}" != x], [break])
         done])
-], [
-    rpathflag=`echo "$RPATHFLAG" | sed 's/%.*//'`
-])
+    ], [
+        rpathflag=`echo "$RPATHFLAG" | sed 's/%.*//'`
+    ])
+
+    AC_ARG_ENABLE(rpath,
+        AS_HELP_STRING([--enable-rpath], [embed run path into extension libraries.
+        enabled by default on ELF platforms]),
+        [enable_rpath=$enableval], [enable_rpath="$rb_cv_binary_elf"])
+
+    AS_IF([test "$enable_rpath:${RPATHFLAG}" = yes:], [
+        RPATHFLAG="${rpathflag:+${rpathflag}%1\$-s}"
+    ])
+    AS_CASE([${RPATHFLAG}],[*'%1$'*],[: ${LIBPATHFLAG='-L%1$-s'}],[: ${LIBPATHFLAG='-L%s'}])
+}
 
 RUBY_TRY_LDFLAGS(-fdeclspec, [fdeclspec=yes], [fdeclspec=no])
 AS_IF([test "$fdeclspec" = yes], [
@@ -621,9 +720,13 @@ AS_IF([test "$fdeclspec" = yes], [
     RUBY_APPEND_OPTIONS(CXXFLAGS, -fdeclspec)
 ])
 
-AS_CASE([$RUBY_PATCHLEVEL], [-*],
-	[RUBY_DEVEL=yes], [RUBY_DEVEL=no])
-particular_werror_flags=$RUBY_DEVEL
+AC_ARG_ENABLE(devel,
+    AS_HELP_STRING([--enable-devel], [enable development build]),
+    [RUBY_DEVEL=$enableval],
+    [AS_IF([test "x${RUBY_DEVEL-no}" != xyes], [RUBY_DEVEL=])]
+)dnl
+AC_SUBST(RUBY_DEVEL)
+particular_werror_flags=${RUBY_DEVEL:-no}
 AC_ARG_ENABLE(werror,
 	AS_HELP_STRING([--disable-werror],
 		       [don't make warnings into errors
@@ -634,23 +737,24 @@ AC_ARG_ENABLE(werror,
 rb_cv_warnflags="$warnflags"
 AS_CASE(["$GCC:${warnflags+set}:${extra_warnflags:+set}:"],
 [yes::*|yes:*:set:], [# GCC && (!warnflags || extra_warnflags)
-    AS_IF([test $gcc_major -ge 4], [
-	extra_warnflags="$extra_warnflags -Werror=extra-tokens"
-    ])
-    AS_IF([test $gcc_major -ge 5 -a $gcc_major -le 6], [
+    AS_IF([test $gcc_major -le 6], [
 	extra_warnflags="$extra_warnflags -Wno-maybe-uninitialized"
     ])
+    AS_CASE([ $CFLAGS ], [*" -save-temps="*|*" -save-temps "*], [], [
+	extra_warnflags="$extra_warnflags -Werror=misleading-indentation"
+    ])
+
     # ICC doesn't support -Werror=
     AS_IF([test $icc_version -gt 0], [
 	particular_werror_flags=no
     ])
     for wflag in \
+		 -Werror=extra-tokens \
 		 -Werror=deprecated-declarations \
 		 -Werror=division-by-zero -Werror=div-by-zero \
 		 -Werror=duplicated-cond \
 		 -Werror=implicit-function-declaration \
 		 -Werror=implicit-int \
-		 -Werror=misleading-indentation \
 		 -Werror=pointer-arith \
 		 -Werror=shorten-64-to-32 \
 		 -Werror=write-strings \
@@ -749,15 +853,14 @@ AS_IF([test "$GCC" = yes], [
 				 [disable -D_FORTIFY_SOURCE=2 option, which causes link error on mingw]),
 		  [fortify_source=$enableval])
     AS_IF([test "x$fortify_source" != xno], [
-        RUBY_TRY_CFLAGS([$optflags -D_FORTIFY_SOURCE=2], [RUBY_APPEND_OPTION(XCFLAGS, -D_FORTIFY_SOURCE=2)], [],
+        RUBY_TRY_CFLAGS([$optflags -D_FORTIFY_SOURCE=2],
+                        [RUBY_PREPEND_OPTION(hardenflags, -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2)], [],
                         [@%:@include <stdio.h>])
     ])
 
-    : ${MJIT_HEADER_FLAGS='-P -dD'}
-
     # -fstack-protector
     AS_CASE(["$target_os"],
-    [mingw*|emscripten*|wasi*], [
+    [emscripten*|wasi*], [
 	stack_protector=no
     ])
     AS_IF([test -z "${stack_protector+set}"], [
@@ -769,10 +872,50 @@ AS_IF([test "$GCC" = yes], [
 	    AS_IF([test "x$stack_protector" = xyes], [stack_protector=option; break])
 	])
     ])
+    AC_MSG_CHECKING([for -fstack-protector])
+    AC_MSG_RESULT(["$stack_protector"])
     AS_CASE(["$stack_protector"], [-*], [
-	RUBY_APPEND_OPTION(XCFLAGS, $stack_protector)
-	RUBY_APPEND_OPTION(XLDFLAGS, $stack_protector)
-	RUBY_APPEND_OPTION(LDFLAGS, $stack_protector)
+        RUBY_PREPEND_OPTION(hardenflags, $stack_protector)
+        RUBY_APPEND_OPTION(XLDFLAGS, $stack_protector)
+        RUBY_APPEND_OPTION(LDFLAGS, $stack_protector)
+    ])
+
+    # aarch64 branch protection
+    AS_CASE(["$target_cpu"], [aarch64|arm64], [
+        # LLVM libunwind is not actually capable of unwinding code compiled with pointer
+        # authentication unless it's built without LIBUNWIND_ENABLE_CROSS_UNWINDING (see
+        # https://github.com/llvm/llvm-project/blob/8e35c86977ce5529a9387657321ac9fefcdae5b5/libunwind/src/DwarfInstructions.hpp#L294)
+        # It seems that macOS ships LLVM compiled this way.
+        # Detect this and disable automatic insertion of pac-ret flags in that case, since we assume
+        # that reliable backtraces are more important than hardening flags.
+        AC_MSG_CHECKING([for a broken LLVM libunwind that cannot unwind code with RA signing])
+	AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
+            @%:@include <libunwind.h>
+            int foo = UNW_ECROSSRASIGNING;
+            ]])],
+            # If compilation succeeds, that means we a) had libunwind, and b) it was NOT native only
+            [rb_cv_libunwind_broken_ra_signing=yes],
+            # if compilation fails, that means we either a) do not have libunwind, or b) have it in
+            # native only mode (which is good!)
+            [rb_cv_libunwind_broken_ra_signing=no]
+        )
+        AC_MSG_RESULT(["$rb_cv_libunwind_broken_ra_signing"])
+        AS_IF([test "x$rb_cv_libunwind_broken_ra_signing" = "xno"], [
+            AS_FOR(option, opt, [-mbranch-protection=pac-ret -msign-return-address=all], [
+                # Try these flags in the _prepended_ position - i.e. we want to try building a program
+                # with CFLAGS="-mbranch-protection=pac-ret $CFLAGS". If the builder has provided different
+                # branch protection flags in CFLAGS, we don't want to overwrite those. We just want to
+                # find some branch protection flags which work if none were provided.
+                RUBY_TRY_CFLAGS_PREPEND(option, [branch_protection=yes], [branch_protection=no])
+                AS_IF([test "x$branch_protection" = xyes], [
+                    # _prepend_ the options to CFLAGS, so that user-provided flags will overwrite them.
+                    # These CFLAGS are used during the configure script to compile further test programs;
+                    # however, $harden_flags is prepended separately to CFLAGS at the end of the script.
+                    RUBY_PREPEND_OPTION(hardenflags, $opt)
+                    break
+                ])
+            ])
+        ])
     ])
 
     AS_CASE("${compress_debug_sections:-zlib}",
@@ -823,50 +966,20 @@ AS_IF([test "$GCC" = yes], [
       # need lgamma_r()
     ])
 
-    # ANSI (no XCFLAGS because this is C only)
-    AS_CASE(["$target_os"],
-    [solaris*], [
-      # Because "-std=gnu99" affects existence of functions on Solaris,
-      # "-std=gnu99" will be appended to CPPFLAGS.
-	for ansi_options in -std=gnu99; do
-	    RUBY_TRY_CFLAGS(${ansi_options}, [
-		RUBY_APPEND_OPTIONS(CPPFLAGS, ${ansi_options})
-	    ], [ansi_options=])
-	    test "x${ansi_options}" = x || break
-	done
-    ],
-    [
-      # ANSI (no XCFLAGS because this is C only)
-      rb_tmp_std_check=`echo $CC $CFLAGS $optflags $warnflags $debugflags | fgrep std= | tr -d  '\015'`
-      AS_IF([test "x$rb_tmp_std_check" = "x"],
-      [
-	for ansi_options in -std=gnu99; do
-	    RUBY_TRY_CFLAGS(${ansi_options}, [
-		RUBY_APPEND_OPTIONS(warnflags, ${ansi_options})
-		RUBY_APPEND_OPTIONS(strict_warnflags, ${ansi_options})
-	    ], [ansi_options=])
-	    test "x${ansi_options}" = x || break
-	done
-      ])
-    ])
-
     # suppress annoying -Wstrict-overflow warnings
     RUBY_TRY_CFLAGS(-fno-strict-overflow, [RUBY_APPEND_OPTION(XCFLAGS, -fno-strict-overflow)])
 
-    test "${debugflags+set}" || {RUBY_TRY_CFLAGS(-ggdb3, [debugflags=-ggdb3])}
-    test "${debugflags+set}" || {RUBY_TRY_CFLAGS(-ggdb, [debugflags=-ggdb])}
-    test "${debugflags+set}" || {RUBY_TRY_CFLAGS(-g3, [debugflags=-g3])}
+    test "${debugflags+set}" || {RUBY_TRY_LDFLAGS(-ggdb3, [debugflags=-ggdb3])}
+    test "${debugflags+set}" || {RUBY_TRY_LDFLAGS(-ggdb, [debugflags=-ggdb])}
+    test "${debugflags+set}" || {RUBY_TRY_LDFLAGS(-g3, [debugflags=-g3])}
 ])
 test $ac_cv_prog_cc_g = yes && : ${debugflags=-g}
-AS_IF([test "x$RUBY_DEVEL" = xyes], [RUBY_APPEND_OPTION(XCFLAGS, -DRUBY_DEVEL=1)])
 
 AS_IF([test "$GCC" = ""], [
     AS_CASE(["$target_os"],[aix*],[warnflags="$warnflags -qinfo=por" rb_cv_warnflags="$rb_cv_warnflags -qinfo=por"])
 ])
 AS_IF([test "$GCC" = yes], [
-    AS_IF([test "$gcc_major" -ge 4], [
-	RUBY_TRY_CFLAGS(-fvisibility=hidden, [visibility_option=yes], [visibility_option=no])
-    ])
+    RUBY_TRY_CFLAGS(-fvisibility=hidden, [visibility_option=yes], [visibility_option=no])
     AC_SUBST(WERRORFLAG, "-Werror")
     AS_IF([test "$visibility_option" = yes], [
 	RUBY_APPEND_OPTION(XCFLAGS, -fvisibility=hidden)
@@ -875,7 +988,6 @@ AS_IF([test "$GCC" = yes], [
     ], [
 	RUBY_TRY_LDFLAGS([-Wl,-unexported_symbol,_Init_*], [visibility_option=ld], [visibility_option=no])
     ])
-    test "$visibility_option" = no || OBJCOPY=:
 ])
 
 AS_IF([test "$GCC" = yes], [
@@ -915,21 +1027,47 @@ AS_CASE(["$target_cpu"], [[i[3-6]86*]], [
     AS_IF([test "$rb_cv_gcc_compiler_cas" = i486], [ARCH_FLAG="-march=i486"])
 ])
 
+OPT_DIR=
+AC_ARG_WITH([gmp-dir],
+  AS_HELP_STRING([--with-gmp-dir=DIR],
+                 [specify the prefix directory where gmp is installed]),
+  [OPT_DIR="${OPT_DIR:+$OPT_DIR$PATH_SEPARATOR}$withval"], [])
+AC_ARG_WITH([gmp],
+  [AS_HELP_STRING([--without-gmp],
+                  [disable GNU GMP to accelerate Bignum operations])],
+  [], [with_gmp=yes])
+
 AC_ARG_WITH(opt-dir,
 	AS_HELP_STRING([--with-opt-dir=DIR-LIST],
 		       [add optional headers and libraries directories separated by $PATH_SEPARATOR]),
-	[
-		val=`echo "$PATH_SEPARATOR$withval" | sed "s|$PATH_SEPARATOR\([[^$PATH_SEPARATOR]*]\)| -I\1/include|g;s/^ //"`
-		CPPFLAGS="$CPPFLAGS $val"
-		val=`echo "$PATH_SEPARATOR$withval" | sed "s|$PATH_SEPARATOR\([[^$PATH_SEPARATOR]*]\)| -L\1/lib${rpathflag:+ $rpathflag\\\\1/lib}|g;s/^ //"`
-		LDFLAGS="$LDFLAGS $val"
-		LDFLAGS_OPTDIR="$val"
-		OPT_DIR="$withval"
-	], [OPT_DIR=])
+	[OPT_DIR="${OPT_DIR:+$OPT_DIR$PATH_SEPARATOR}$withval"], [])
+
+AS_IF([test "x$OPT_DIR" != x], [
+    save_IFS="$IFS" IFS="$PATH_SEPARATOR" val= PWD=
+    for dir in $OPT_DIR; do
+        test -z "$dir" && continue
+        dir=`eval $CHDIR '"$dir"' 2>/dev/null && pwd` || continue
+        val="${val:+$val$PATH_SEPARATOR}$dir"
+    done
+    IFS="$save_IFS" OPT_DIR="$val"
+    unset PWD
+    unset save_IFS
+    val=`IFS="$PATH_SEPARATOR"
+        for dir in $OPT_DIR; do
+            echo x ${LIBPATHFLAG} ${RPATHFLAG} |
+            sed "s/^x *//;s${IFS}"'%1\\$-s'"${IFS}${dir}/lib${IFS}g;s${IFS}%s${IFS}${dir}/lib${IFS}g"
+        done | tr '\012' ' ' | sed 's/ *$//'`
+    LDFLAGS="${LDFLAGS:+$LDFLAGS }$val"
+    DLDFLAGS="${DLDFLAGS:+$DLDFLAGS }$val"
+    LDFLAGS_OPTDIR="$val"
+    INCFLAGS="${INCFLAGS:+$INCFLAGS }"`echo "$OPT_DIR" | tr "${PATH_SEPARATOR}" '\012' |
+        sed '/^$/d;s|^|-I|;s|$|/include|' | tr '\012' ' ' | sed 's/ *$//'`
+])
+AC_SUBST(incflags, "$INCFLAGS")
 
 test -z "${ac_env_CFLAGS_set}" -a -n "${cflags+set}" && eval CFLAGS="\"$cflags $ARCH_FLAG\""
 test -z "${ac_env_CXXFLAGS_set}" -a -n "${cxxflags+set}" && eval CXXFLAGS="\"$cxxflags $ARCH_FLAG\""
-}
+
 
 AC_CACHE_CHECK([whether compiler has statement and declarations in expressions],
   rb_cv_have_stmt_and_decl_in_expr,
@@ -939,8 +1077,9 @@ AC_CACHE_CHECK([whether compiler has statement and declarations in expressions],
 AS_IF([test "$rb_cv_have_stmt_and_decl_in_expr" = yes], [
   AC_DEFINE(HAVE_STMT_AND_DECL_IN_EXPR)
 ])
+}
 
-: "header and library section" && {
+[begin]_group "header and library section" && {
 AC_ARG_WITH(winnt-ver,
   AS_HELP_STRING([--with-winnt-ver=0xXXXX], [target Windows NT version (default to 0x0600)]),
   [with_winnt_ver="$withval"], [with_winnt_ver="0x0600"])
@@ -992,10 +1131,9 @@ AS_CASE(["$target_os"],
 		ac_cv_lib_crypt_crypt=no
 		ac_cv_func_fdatasync=no # Mac OS X wrongly reports it has fdatasync()
 		ac_cv_func_vfork=no
-		AS_IF([test $gcc_major -lt 4 -o \( $gcc_major -eq 4 -a $gcc_minor -lt 3 \)], [
+		AS_IF([test $gcc_major -eq 4 -a $gcc_minor -lt 3], [
 		    ac_cv_func___builtin_setjmp=no
 		])
-		with_setjmp_type=sigsetjmp # to hijack SIGCHLD handler
 		AC_CACHE_CHECK(for broken crypt with 8bit chars, rb_cv_broken_crypt,
 		    [AC_RUN_IFELSE([AC_LANG_SOURCE([[
 #include <stdio.h>
@@ -1043,21 +1181,23 @@ main()
 		])
 		POSTLINK=""
 		AC_CHECK_PROGS(codesign, codesign)
-		AC_CHECK_PROGS(dsymutil, dsymutil)
+		dsymutils=
+		AS_CASE("$CC_NO_WRAPPER", [gcc*-1[[3-9]]], [
+		    dsymutils=${CC_NO_WRAPPER@%:@gcc}
+		    dsymutils=dsymutil${dsymutils%-1*}
+		    dsymutils="$dsymutils-19 $dsymutils-18 $dsymutils-17"
+		])
+		AC_CHECK_PROGS(dsymutil, $dsymutils dsymutil)
 		AS_IF([test -n "$codesign"], [
-		    POSTLINK="{ test -z '\$(RUBY_CODESIGN)' || $codesign -s '\$(RUBY_CODESIGN)' -f \$@; }${POSTLINK:+; $POSTLINK}"
+		    POSTLINK="{ test -z '\$(RUBY_CODESIGN)' || $codesign -s '\$(RUBY_CODESIGN)' \$@; }${POSTLINK:+; $POSTLINK}"
 		])
 		AS_IF([test -n "$dsymutil"], [
-		    POSTLINK="$dsymutil \$@${POSTLINK:+; $POSTLINK}"
-		])
-		AS_IF([test -n "${POSTLINK}"], [
-		    LINK_SO="$LINK_SO
-\$(POSTLINK)"
+		    POSTLINK="$dsymutil \$@ 2>/dev/null${POSTLINK:+; $POSTLINK}"
 		])
 		AC_CHECK_HEADERS(crt_externs.h, [], [], [
 		    #include <crt_externs.h>
 		])
-		cleanlibs='$(TARGET_SO).dSYM'
+		cleanlibs='$(TARGET_SO:=.dSYM)'
 		],
 [solaris*], [	LIBS="-lm $LIBS"
 		ac_cv_func_vfork=no
@@ -1128,6 +1268,11 @@ main()
 		ac_cv_header_sys_time_h=no
 		ac_cv_header_sys_times_h=no
 		ac_cv_header_sys_socket_h=no
+		ac_cv_func_chown=yes
+		ac_cv_func_getegid=yes
+		ac_cv_func_geteuid=yes
+		ac_cv_func_getgid=yes
+		ac_cv_func_getuid=yes
 		ac_cv_func_execv=yes
 		ac_cv_func_lstat=yes
 		ac_cv_func_times=yes
@@ -1140,31 +1285,30 @@ main()
 		ac_cv_func_readlink=yes
 		ac_cv_func_shutdown=yes
 		ac_cv_func_symlink=yes
+		ac_cv_func_clock_getres=yes
+		ac_cv_func_clock_gettime=yes
 		ac_cv_lib_crypt_crypt=no
 		ac_cv_func_getpgrp_void=no
 		ac_cv_func_memcmp_working=yes
 		ac_cv_lib_dl_dlopen=no
-		rb_cv_binary_elf=no
 		rb_cv_negative_time_t=yes
 		ac_cv_func_fcntl=yes
 		ac_cv_func_flock=yes
 		ac_cv_func_gmtime_r=yes
 		rb_cv_large_fd_select=yes
 		ac_cv_type_struct_timeval=yes
-                ac_cv_func_clock_gettime=yes
-                ac_cv_func_clock_getres=yes
 		ac_cv_func_malloc_usable_size=no
 		ac_cv_type_off_t=yes
 		ac_cv_sizeof_off_t=8
 		AS_IF([test "$target_cpu" = x64], [
 		    ac_cv_func___builtin_setjmp=yes
 		    ac_cv_func_round=no
-		    coroutine_type=yes
+		    ac_cv_func_tgamma=no
 		])
-		ac_cv_func_tgamma=no
 		AC_CHECK_TYPE([NET_LUID], [], [],
 			      [@%:@include <winsock2.h>
-			      @%:@include <iphlpapi.h>])
+			       @%:@include <windows.h>
+			       @%:@include <iphlpapi.h>])
 		AS_IF([test x"$ac_cv_type_NET_LUID" = xyes], [
 		    AC_DEFINE(HAVE_TYPE_NET_LUID, 1)
 		])
@@ -1194,12 +1338,8 @@ main()
 		# __builtin_longjmp in ppc64* Linux does not restore
 		# the TOC register (r2), which is problematic
 		# when a global exit happens from JITted .so code.
-		AS_CASE(["$target_cpu"], [powerpc64*], [
-			ac_cv_func___builtin_setjmp=no
-		])
-		# With gcc-8's -fcf-protection, MJIT's __builtin_longjmp fails.
-		AS_CASE(["$CC $CFLAGS "], [*" -fcf-protection "*], [cf_protection=yes], [cf_protection=no])
-		AS_IF([test "$cf_protection" = yes], [
+		# __builtin_setjmp can have issues on arm64 linux (see [Bug #14480]).
+		AS_CASE(["$target_cpu"], [powerpc64*|arm64|aarch64], [
 			ac_cv_func___builtin_setjmp=no
 		])
 		],
@@ -1212,7 +1352,7 @@ main()
 [wasi*],[	LIBS="-lm -lwasi-emulated-mman -lwasi-emulated-signal -lwasi-emulated-getpid -lwasi-emulated-process-clocks $LIBS"
 		RUBY_APPEND_OPTIONS(CFLAGS, -D_WASI_EMULATED_SIGNAL -D_WASI_EMULATED_MMAN -D_WASI_EMULATED_GETPID -D_WASI_EMULATED_PROCESS_CLOCKS)
 		RUBY_APPEND_OPTIONS(CPPFLAGS, -D_WASI_EMULATED_SIGNAL -D_WASI_EMULATED_MMAN -D_WASI_EMULATED_GETPID -D_WASI_EMULATED_PROCESS_CLOCKS)
-		POSTLINK="\$(WASMOPT) --asyncify \$(wasmoptflags) --pass-arg=asyncify-ignore-imports -o \$@ \$@${POSTLINK:+; $POSTLINK}"
+		POSTLINK="\$(WASMOPT) --asyncify \$(wasmoptflags) -o \$@ \$@${POSTLINK:+; $POSTLINK}"
 		# wasi-libc's sys/socket.h is not compatible with -std=gnu99,
 		# so re-declare shutdown in include/ruby/missing.h
 		ac_cv_func_shutdown=no
@@ -1220,6 +1360,13 @@ main()
 [	LIBS="-lm $LIBS"])
 : ${ORIG_LIBS=$LIBS}
 
+AS_IF([test -n "${POSTLINK}"], [
+    # NOTE: A (part of) link commands used link shared extension libraries. If
+    # the first line of the value is empty, mkmf prepends default link steps.
+    LINK_SO="$LINK_SO
+\$(POSTLINK)"
+])
+
 AS_IF([test -n "${rb_there_is_in_fact_no_gplusplus_but_autoconf_is_cheating_us}"], [
     AC_MSG_NOTICE([Test skipped due to lack of a C++ compiler.])
 ],
@@ -1248,6 +1395,11 @@ dnl AC_HEADER_STDC has been checked in AC_USE_SYSTEM_EXTENSIONS
 AC_HEADER_STDBOOL
 AC_HEADER_SYS_WAIT
 
+AC_CHECK_HEADERS([afunix.h], [], [],
+[#ifdef _WIN32
+# include <winsock2.h>
+#endif
+])
 AC_CHECK_HEADERS(atomic.h)
 AC_CHECK_HEADERS(copyfile.h)
 AC_CHECK_HEADERS(direct.h)
@@ -1267,6 +1419,7 @@ AC_CHECK_HEADERS(process.h)
 AC_CHECK_HEADERS(pwd.h)
 AC_CHECK_HEADERS(sanitizer/asan_interface.h)
 AC_CHECK_HEADERS(sanitizer/msan_interface.h)
+AC_CHECK_HEADERS(sanitizer/tsan_interface.h)
 AC_CHECK_HEADERS(setjmpex.h)
 AC_CHECK_HEADERS(stdalign.h)
 AC_CHECK_HEADERS(stdio.h)
@@ -1294,18 +1447,18 @@ AC_CHECK_HEADERS(syscall.h)
 AC_CHECK_HEADERS(time.h)
 AC_CHECK_HEADERS(ucontext.h)
 AC_CHECK_HEADERS(utime.h)
-AS_CASE("$target_cpu", [x64|x86_64|i[3-6]86*], [
+AC_CHECK_HEADERS(sys/epoll.h)
+AC_CHECK_HEADERS(sys/event.h)
+AC_CHECK_HEADERS(stdckdint.h)
+AC_CHECK_HEADERS(stdatomic.h)
+
+AS_CASE("$target_cpu", [x64|x86_64|[i[3-6]86*]], [
   AC_CHECK_HEADERS(x86intrin.h)
 ])
 RUBY_UNIVERSAL_CHECK_HEADER([x86_64, i386], x86intrin.h)
 
-AC_ARG_WITH([gmp],
-  [AS_HELP_STRING([--without-gmp],
-    [disable GNU GMP to accelerate Bignum operations])],
-  [],
-  [with_gmp=yes])
 AS_IF([test "x$with_gmp" != xno],
-  [AC_CHECK_HEADERS(gmp.h)
+  [RUBY_CHECK_HEADER(gmp.h)
    AS_IF([test "x$ac_cv_header_gmp_h" != xno],
      AC_SEARCH_LIBS([__gmpz_init], [gmp],
        [AC_DEFINE(HAVE_LIBGMP, 1)]))])
@@ -1315,6 +1468,8 @@ AC_ARG_WITH([jemalloc],
   [with_jemalloc=$withval], [with_jemalloc=no])
 AS_IF([test "x$with_jemalloc" != xno],[
   # find jemalloc header first
+  save_CPPFLAGS="${CPPFLAGS}"
+  CPPFLAGS="${INCFLAGS} ${CPPFLAGS}"
   malloc_header=
   AC_CHECK_HEADER(jemalloc/jemalloc.h, [malloc_header=jemalloc/jemalloc.h], [
     AC_CHECK_HEADER(jemalloc.h, [malloc_header=jemalloc.h])
@@ -1346,6 +1501,8 @@ AS_IF([test "x$with_jemalloc" != xno],[
       done
     done
   ])
+  CPPFLAGS="${save_CPPFLAGS}"
+  unset save_CPPFLAGS
   with_jemalloc=${rb_cv_jemalloc_library}
   AS_CASE(["$with_jemalloc"],
   [no],
@@ -1371,7 +1528,7 @@ AC_SYS_LARGEFILE
 # which is not added by AC_SYS_LARGEFILE.
 AS_IF([test x"$enable_largefile" != xno], [
   AS_CASE(["$target_os"], [solaris*], [
-    AC_MSG_CHECKING([wheather _LARGEFILE_SOURCE should be defined])
+    AC_MSG_CHECKING([whether _LARGEFILE_SOURCE should be defined])
     AS_CASE(["${ac_cv_sys_file_offset_bits}:${ac_cv_sys_large_files}"],
       ["64:"|"64:no"|"64:unknown"], [
 	# insert _LARGEFILE_SOURCE before _FILE_OFFSET_BITS line
@@ -1432,6 +1589,25 @@ RUBY_CHECK_SIZEOF(float)
 RUBY_CHECK_SIZEOF(double)
 RUBY_CHECK_SIZEOF(time_t, [long "long long"], [], [@%:@include <time.h>])
 RUBY_CHECK_SIZEOF(clock_t, [], [], [@%:@include <time.h>])
+AC_SUBST(X_BUILTIN_BINARY, yes)
+AS_IF([test "$cross_compiling" = yes],
+[dnl miniruby cannot run if cross compiling
+    X_BUILTIN_BINARY=no
+],
+[
+    AS_CASE([ac_cv_sizeof_voidp],
+    [[1-9]*], [dnl fixed value
+    ],
+    [
+        AC_CACHE_CHECK([word size], [rb_cv_word_size],
+            [for w in 4 8; do
+                AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[@%:@if SIZEOF_VOIDP != ${w}
+                @%:@error SIZEOF_VOIDP
+                @%:@endif]])], [rb_cv_word_size=${w}; break])
+            done])
+        AS_IF([test -z $rb_cv_word_size], [X_BUILTIN_BINARY=no])
+    ])
+])
 
 AC_CACHE_CHECK(packed struct attribute, rb_cv_packed_struct,
     [rb_cv_packed_struct=no
@@ -1444,10 +1620,9 @@ AC_CACHE_CHECK(packed struct attribute, rb_cv_packed_struct,
 		[rb_cv_packed_struct=$mac; break])
     done])
 AS_IF([test "$rb_cv_packed_struct" != no], [
-    AC_DEFINE_UNQUOTED([PACKED_STRUCT(x)], [$rb_cv_packed_struct])
+    AC_DEFINE_UNQUOTED([RBIMPL_ATTR_PACKED_STRUCT_BEGIN()], [`echo " $rb_cv_packed_struct " | sed 's/ x .*//;s/^ *//'`])
+    AC_DEFINE_UNQUOTED([RBIMPL_ATTR_PACKED_STRUCT_END()], [`echo " $rb_cv_packed_struct " | sed 's/.* x //;s/ *$//'`])
     RUBY_TRY_CFLAGS(-Wno-address-of-packed-member, [AC_DEFINE(USE_UNALIGNED_MEMBER_ACCESS)])
-], [
-    AC_DEFINE_UNQUOTED([PACKED_STRUCT(x)], x)
 ])
 
 AS_IF([test "x$ac_cv_type_long_long" = xyes], [
@@ -1552,21 +1727,6 @@ AS_IF([test "$rb_cv_func_weak" != x], [
    AC_DEFINE(HAVE_FUNC_WEAK)
 ])
 
-AC_CACHE_CHECK([for __attribute__((__depreacted__(msg))) in C++],
-  rb_cv_CentOS6_CXX_workaround,
-  RUBY_WERROR_FLAG([
-    AC_LANG_PUSH([C++])
-    AC_COMPILE_IFELSE(
-      [AC_LANG_PROGRAM(
-        [],
-        [__attribute__((__deprecated__("message"))) int conftest(...);])],
-      [rb_cv_CentOS6_CXX_workaround=yes],
-      [rb_cv_CentOS6_CXX_workaround=no])
-    AC_LANG_POP()]))
-AS_IF([test "$rb_cv_CentOS6_CXX_workaround" != no],[
-  AC_DEFINE([RUBY_CXX_DEPRECATED(msg)],
-    [__attribute__((__deprecated__(msg)))])])
-
 AC_CACHE_CHECK([for std::nullptr_t], rb_cv_CXX_nullptr, [
   AC_LANG_PUSH([C++])
   AC_COMPILE_IFELSE(
@@ -1616,6 +1776,26 @@ AS_IF([test "$GCC" = yes], [
 		    [rb_cv_gcc_atomic_builtins=no])])
     AS_IF([test "$rb_cv_gcc_atomic_builtins" = yes], [
 	AC_DEFINE(HAVE_GCC_ATOMIC_BUILTINS)
+	for lib in "" atomic; do
+	    AS_IF([test "$lib" != ""], [
+		AC_CHECK_LIB([atomic], [__atomic_fetch_add_8])
+		unset rb_cv_gcc_atomic_builtins_64
+	    ])
+	    AC_CACHE_CHECK([for 64bit __atomic builtins${lib:+ with -l$lib}],
+		[rb_cv_gcc_atomic_builtins_64], [
+		AC_LINK_IFELSE([AC_LANG_PROGRAM([[@%:@include <stdint.h>
+			    uint64_t atomic_var;]],
+			    [[
+				__atomic_load_n(&atomic_var, __ATOMIC_RELAXED);
+				__atomic_store_n(&atomic_var, 0, __ATOMIC_RELAXED);
+			    ]])],
+			    [rb_cv_gcc_atomic_builtins_64=yes],
+			    [rb_cv_gcc_atomic_builtins_64=no])])
+	    AS_IF([test "$rb_cv_gcc_atomic_builtins_64" = yes], [
+		AC_DEFINE(HAVE_GCC_ATOMIC_BUILTINS_64)
+		break
+	    ])
+	done
     ])
 
     AC_CACHE_CHECK([for __sync builtins], [rb_cv_gcc_sync_builtins], [
@@ -1662,7 +1842,7 @@ AS_IF([test "$GCC" = yes], [
 AC_CACHE_CHECK(for exported function attribute, rb_cv_func_exported, [
 rb_cv_func_exported=no
 RUBY_WERROR_FLAG([
-for mac in '__attribute__ ((__visibility__("default")))' '__declspec(dllexport)'; do
+for mac in '__declspec(dllexport)' '__attribute__ ((__visibility__("default")))'; do
   AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[@%:@define RUBY_FUNC_EXPORTED $mac extern
     RUBY_FUNC_EXPORTED void conftest_attribute_check(void);]], [[]])],
     [rb_cv_func_exported="$mac"; break])
@@ -1679,16 +1859,12 @@ RUBY_DECL_ATTRIBUTE([__nonnull__(n)], [RUBY_FUNC_NONNULL(n,x)], [rb_cv_func_nonn
 
 RUBY_APPEND_OPTION(XCFLAGS, -DRUBY_EXPORT)
 
-AC_ARG_ENABLE(mathn,
-    AS_HELP_STRING([--enable-mathn], [enable canonicalization for mathn]),
-    [AC_MSG_ERROR([mathn support has been dropped])])
-
 AC_CACHE_CHECK(for function name string predefined identifier,
     rb_cv_function_name_string,
     [AS_CASE(["$target_os"],[openbsd*],[
       rb_cv_function_name_string=__func__
      ],[
-     rb_cv_function_name_string=no
+      rb_cv_function_name_string=no
       RUBY_WERROR_FLAG([
         for func in __func__ __FUNCTION__; do
             AC_LINK_IFELSE([AC_LANG_PROGRAM([[@%:@include <stdio.h>]],
@@ -1696,7 +1872,8 @@ AC_CACHE_CHECK(for function name string predefined identifier,
             [rb_cv_function_name_string=$func
             break])
         done
-      ])])]
+      ])
+    ])]
 )
 AS_IF([test "$rb_cv_function_name_string" != no], [
     AC_DEFINE_UNQUOTED(RUBY_FUNCTION_NAME_STRING, [$rb_cv_function_name_string])
@@ -1866,7 +2043,7 @@ AS_IF([test $rb_cv_stack_end_address != no], [
 dnl Checks for library functions.
 AC_TYPE_GETGROUPS
 AS_CASE(["${target_cpu}-${target_os}:${target_archs}"],
-[powerpc-darwin*], [
+[powerpc*-darwin*], [
   AC_LIBSOURCES(alloca.c)
   AC_SUBST([ALLOCA], [\${LIBOBJDIR}alloca.${ac_objext}])
   AC_DEFINE(C_ALLOCA)
@@ -1875,8 +2052,8 @@ AS_CASE(["${target_cpu}-${target_os}:${target_archs}"],
 [universal-darwin*:*ppc*], [
   AC_LIBSOURCES(alloca.c)
   AC_SUBST([ALLOCA], [\${LIBOBJDIR}alloca.${ac_objext}])
-  RUBY_DEFINE_IF([defined __powerpc__], C_ALLOCA, 1)
-  RUBY_DEFINE_IF([defined __powerpc__], alloca, alloca)
+  RUBY_DEFINE_IF([defined __POWERPC__], C_ALLOCA, 1) # Darwin defines __POWERPC__ for ppc and ppc64 both
+  RUBY_DEFINE_IF([defined __POWERPC__], alloca, alloca)
   ],
 [
   AC_FUNC_ALLOCA
@@ -1956,6 +2133,7 @@ AC_CHECK_FUNCS(_longjmp)		# used for AC_ARG_WITH(setjmp-type)
 test x$ac_cv_func__longjmp = xno && ac_cv_func__setjmp=no
 AC_CHECK_FUNCS(arc4random_buf)
 AC_CHECK_FUNCS(atan2l atan2f)
+AC_CHECK_DECLS(atomic_signal_fence, [], [], [@%:@include <stdatomic.h>])
 AC_CHECK_FUNCS(chmod)
 AC_CHECK_FUNCS(chown)
 AC_CHECK_FUNCS(chroot)
@@ -1979,6 +2157,7 @@ AC_CHECK_FUNCS(execv)
 AC_CHECK_FUNCS(execve)
 AC_CHECK_FUNCS(explicit_memset)
 AC_CHECK_FUNCS(fcopyfile)
+AC_CHECK_FUNCS(fchdir)
 AC_CHECK_FUNCS(fchmod)
 AC_CHECK_FUNCS(fchown)
 AC_CHECK_FUNCS(fcntl)
@@ -2019,7 +2198,6 @@ AC_CHECK_FUNCS(gettimeofday)		# for making ac_cv_func_gettimeofday
 AC_CHECK_FUNCS(getuid)
 AC_CHECK_FUNCS(getuidx)
 AC_CHECK_FUNCS(gmtime_r)
-AC_CHECK_FUNCS(grantpt)
 AC_CHECK_FUNCS(initgroups)
 AC_CHECK_FUNCS(ioctl)
 AC_CHECK_FUNCS(isfinite)
@@ -2036,6 +2214,7 @@ AC_CHECK_FUNCS(lstat)
 AC_CHECK_FUNCS(lutimes)
 AC_CHECK_FUNCS(malloc_usable_size)
 AC_CHECK_FUNCS(malloc_size)
+AC_CHECK_FUNCS(malloc_trim)
 AC_CHECK_FUNCS(mblen)
 AC_CHECK_FUNCS(memalign)
 AC_CHECK_FUNCS(memset_s)
@@ -2089,6 +2268,7 @@ AC_CHECK_FUNCS(sigaction)
 AC_CHECK_FUNCS(sigaltstack)
 AC_CHECK_FUNCS(sigprocmask)
 AC_CHECK_FUNCS(sinh)
+AC_CHECK_FUNCS(snprintf)
 AC_CHECK_FUNCS(spawnv)
 AC_CHECK_FUNCS(symlink)
 AC_CHECK_FUNCS(syscall)
@@ -2113,9 +2293,6 @@ AC_CHECK_FUNCS(__sinpi)
 AS_IF([test "x$ac_cv_member_struct_statx_stx_btime" = xyes],
     [AC_CHECK_FUNCS(statx)])
 
-AS_CASE(["$ac_cv_func_memset_s:$ac_cv_func_qsort_s"], [*yes*],
-    [RUBY_DEFINE_IF([!defined __STDC_WANT_LIB_EXT1__], [__STDC_WANT_LIB_EXT1__], 1)])
-
 AS_IF([test "$ac_cv_func_getcwd" = yes], [
     AC_CACHE_CHECK(if getcwd allocates buffer if NULL is given, [rb_cv_getcwd_malloc],
 	[AC_RUN_IFELSE([AC_LANG_SOURCE([[
@@ -2165,10 +2342,6 @@ RUBY_CHECK_BUILTIN_FUNC(__builtin_clzl, [__builtin_clzl(0)])
 RUBY_CHECK_BUILTIN_FUNC(__builtin_clzll, [__builtin_clzll(0)])
 RUBY_CHECK_BUILTIN_FUNC(__builtin_ctz, [__builtin_ctz(0)])
 RUBY_CHECK_BUILTIN_FUNC(__builtin_ctzll, [__builtin_ctzll(0)])
-RUBY_CHECK_BUILTIN_FUNC(__builtin_add_overflow, [int x;__builtin_add_overflow(0,0,&x)])
-RUBY_CHECK_BUILTIN_FUNC(__builtin_sub_overflow, [int x;__builtin_sub_overflow(0,0,&x)])
-RUBY_CHECK_BUILTIN_FUNC(__builtin_mul_overflow, [int x;__builtin_mul_overflow(0,0,&x)])
-RUBY_CHECK_BUILTIN_FUNC(__builtin_mul_overflow_p, [__builtin_mul_overflow_p(0,0,(int)0)])
 RUBY_CHECK_BUILTIN_FUNC(__builtin_constant_p, [__builtin_constant_p(0)])
 RUBY_CHECK_BUILTIN_FUNC(__builtin_choose_expr, [
     [int x[__extension__(__builtin_choose_expr(1, 1, -1))]];
@@ -2184,6 +2357,10 @@ RUBY_CHECK_BUILTIN_FUNC(__builtin_types_compatible_p, [__builtin_types_compatibl
 RUBY_CHECK_BUILTIN_FUNC(__builtin_trap, [__builtin_trap()])
 RUBY_CHECK_BUILTIN_FUNC(__builtin_expect, [__builtin_expect(0, 0)])
 
+RUBY_CHECK_BUILTIN_OVERFLOW(add)
+RUBY_CHECK_BUILTIN_OVERFLOW(sub)
+RUBY_CHECK_BUILTIN_OVERFLOW(mul)
+
 AS_IF([test "$ac_cv_func_qsort_r" != no], [
   AC_CACHE_CHECK(whether qsort_r is GNU version, rb_cv_gnu_qsort_r,
     [AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
@@ -2546,6 +2723,15 @@ AS_CASE([$coroutine_type], [yes|''], [
         [arm64-darwin*], [
             coroutine_type=arm64
         ],
+        # Correct target name is powerpc*-, but Ruby seems to prefer ppc*-.
+        # Notice that Darwin PPC ABI differs from AIX and ELF.
+        # Adding PPC targets for AIX, *BSD and *Linux will require separate implementations.
+        [powerpc-darwin*|ppc-darwin*], [
+            coroutine_type=ppc
+        ],
+        [powerpc64-darwin*|ppc64-darwin*], [
+            coroutine_type=ppc64
+        ],
         [x*64-linux*], [
             AS_CASE(["$ac_cv_sizeof_voidp"],
                 [8], [ coroutine_type=amd64 ],
@@ -2562,6 +2748,9 @@ AS_CASE([$coroutine_type], [yes|''], [
         [*86-mingw*], [
             coroutine_type=win32
         ],
+        [aarch64-mingw*], [
+            coroutine_type=arm64
+        ],
         [arm*-linux*], [
             coroutine_type=arm32
         ],
@@ -2574,6 +2763,9 @@ AS_CASE([$coroutine_type], [yes|''], [
         [riscv64-linux*], [
             coroutine_type=riscv64
         ],
+        [loongarch64-linux*], [
+            coroutine_type=loongarch64
+        ],
         [x86_64-freebsd*], [
             coroutine_type=amd64
         ],
@@ -2583,6 +2775,12 @@ AS_CASE([$coroutine_type], [yes|''], [
         [aarch64-freebsd*], [
             coroutine_type=arm64
         ],
+        [powerpc64-freebsd*], [
+            coroutine_type=ppc64le
+        ],
+        [powerpc64le-freebsd*], [
+            coroutine_type=ppc64le
+        ],
         [x86_64-netbsd*], [
             coroutine_type=amd64
         ],
@@ -2598,6 +2796,12 @@ AS_CASE([$coroutine_type], [yes|''], [
         [i386-openbsd*], [
             coroutine_type=x86
         ],
+        [aarch64-openbsd*], [
+            coroutine_type=arm64
+        ],
+        [riscv64-openbsd*], [
+            coroutine_type=riscv64
+        ],
         [*-openbsd*], [
             coroutine_type=pthread
         ],
@@ -2695,6 +2899,22 @@ AS_IF([test "$THREAD_MODEL" = pthread], [
 		AC_DEFINE_UNQUOTED(SET_ANOTHER_THREAD_NAME(thid,name), $set_another_thread_name)
 	    ])
     ])
+
+    AC_CACHE_CHECK([for thread-local storage specifier], [rb_cv_tls_specifier],
+        rb_cv_tls_specifier=none
+        RUBY_WERROR_FLAG([
+            for attr in \
+                _Thread_local \
+                __thread \
+                ; do
+                AC_LINK_IFELSE([AC_LANG_PROGRAM([[$attr int conftest;]])],
+                    [rb_cv_tls_specifier=$attr; break])
+            done
+        ])
+    )
+    AS_IF([test x"${rb_cv_tls_specifier}" != xnone],
+        [AC_DEFINE_UNQUOTED(RB_THREAD_LOCAL_SPECIFIER, ${rb_cv_tls_specifier})]
+    )
 ])
 
 AS_IF([test x"$ac_cv_header_ucontext_h" = xno], [
@@ -2838,8 +3058,8 @@ AS_IF([test "x$ac_cv_func_ioctl" = xyes], [
 
 }
 
-: "runtime section" && {
-dnl wheather use dln_a_out or not
+[begin]_group "runtime section" && {
+dnl whether use dln_a_out or not
 AC_ARG_WITH(dln-a-out,
 	AS_HELP_STRING([--with-dln-a-out], [dln_a_out is deprecated]),
 	[
@@ -2849,12 +3069,6 @@ AC_ARG_WITH(dln-a-out,
 	])
 ])
 
-AC_CACHE_CHECK(whether ELF binaries are produced, rb_cv_binary_elf,
-[AC_LINK_IFELSE([AC_LANG_PROGRAM([[]], [[]])],[
-AS_CASE(["`head -1 conftest$EXEEXT | tr -dc '\177ELF' | tr '\177' .`"],
-[.ELF*], [rb_cv_binary_elf=yes], [rb_cv_binary_elf=no])],
-rb_cv_binary_elf=no)])
-
 AS_IF([test "$rb_cv_binary_elf" = yes], [
   AC_DEFINE(USE_ELF)
   AC_CHECK_HEADERS([elf.h elf_abi.h])
@@ -2878,22 +3092,8 @@ AS_CASE(["$target_os"],
     ])])
 LIBEXT=a
 
-AC_ARG_WITH(mjit-tabs,
-    AS_HELP_STRING([--without-mjit-tabs], [expand tabs in mjit header]),
-    [AS_IF([test $withval = no], [MJIT_TABS=false])])
-AC_SUBST(MJIT_TABS)dnl
 AC_SUBST(DLDFLAGS)dnl
 AC_SUBST(ARCH_FLAG)dnl
-AC_SUBST(MJIT_HEADER_FLAGS)dnl
-AC_SUBST(MJIT_HEADER_INSTALL_DIR)dnl
-AC_SUBST(MJIT_CC)dnl
-AS_CASE(["$GCC:$target_os"],
-    [yes:aix*], [mjit_std_cflag="-std=gnu99"],
-    [mjit_std_cflag=])
-AC_SUBST(MJIT_CFLAGS, [${MJIT_CFLAGS-"-w ${mjit_std_cflag} ${orig_cflags}"}])dnl
-AC_SUBST(MJIT_OPTFLAGS, [${MJIT_OPTFLAGS-'$(optflags)'}])dnl
-AC_SUBST(MJIT_DEBUGFLAGS, [${MJIT_DEBUGFLAGS-'$(debugflags)'}])dnl
-AC_SUBST(MJIT_LDSHARED)dnl
 
 AC_SUBST(STATIC)dnl
 AC_SUBST(CCDLFLAGS)dnl
@@ -2931,13 +3131,25 @@ STATIC=
   ])
 }
 
-: "rpath" && {
-  AC_ARG_ENABLE(rpath,
-       AS_HELP_STRING([--enable-rpath], [embed run path into extension libraries.
-       enabled by default on ELF platforms]),
-       [enable_rpath=$enableval], [enable_rpath="$rb_cv_binary_elf"])
+EXTSTATIC=
+AC_SUBST(EXTSTATIC)dnl
+AC_ARG_WITH(static-linked-ext,
+	    AS_HELP_STRING([--with-static-linked-ext], [link external modules statically]),
+            [AS_CASE([$withval],[yes],[STATIC=;EXTSTATIC=static],[no],[],[EXTSTATIC="$withval"])])
+AS_CASE([",$EXTSTATIC,"], [,static,|*,enc,*], [
+  ENCOBJS='enc/encinit.$(OBJEXT) enc/libenc.$(LIBEXT) enc/libtrans.$(LIBEXT)'
+  EXTOBJS='ext/extinit.$(OBJEXT)'
+  AC_DEFINE_UNQUOTED(EXTSTATIC, 1)
+  AC_SUBST(ENCSTATIC, static)
+], [
+  ENCOBJS='dmyenc.$(OBJEXT)'
+  EXTOBJS='dmyext.$(OBJEXT)'
+])
+AC_SUBST(ENCOBJS)
+AC_SUBST(EXTOBJS)
 
-  AS_CASE(["$target_os"],
+: "rpath" && {
+    AS_CASE(["$target_os"],
 	[solaris*], [	AS_IF([test "$GCC" = yes], [
 			    : ${LDSHARED='$(CC) -shared'}
 			    AS_IF([test "$rb_cv_prog_gnu_ld" = yes], [
@@ -2977,7 +3189,6 @@ STATIC=
 			rb_cv_dlopen=yes],
 	[interix*], [	: ${LDSHARED='$(CC) -shared'}
 			XLDFLAGS="$XLDFLAGS -Wl,-E"
-			LIBPATHFLAG=" -L%1\$-s"
 			rb_cv_dlopen=yes],
 	[freebsd*|dragonfly*], [
 			: ${LDSHARED='$(CC) -shared'}
@@ -2996,8 +3207,15 @@ STATIC=
 	[darwin*], [	: ${LDSHARED='$(CC) -dynamic -bundle'}
 			: ${DLDSHARED='$(CC) -dynamiclib'}
 			: ${LDFLAGS=""}
-			: ${LIBPATHENV=DYLD_FALLBACK_LIBRARY_PATH}
+			: ${LIBPATHENV=DYLD_LIBRARY_PATH}
 			: ${PRELOADENV=DYLD_INSERT_LIBRARIES}
+                        AS_IF([test x"$enable_shared" = xyes], [
+                            # Resolve symbols from libruby.dylib in $(LIBS) when --enable-shared
+                        ], [test "x$EXTSTATIC" = x], [
+                            # When building exts as bundles, a mach-o bundle needs to know its loader
+                            # program to bind symbols from the ruby executable
+                            EXTDLDFLAGS="-bundle_loader '\$(BUILTRUBY)'"
+			])
 			rb_cv_dlopen=yes],
         [aix*], [	: ${LDSHARED='$(CC)'}
 			AS_IF([test "$GCC" = yes], [
@@ -3028,31 +3246,37 @@ STATIC=
 	[hiuxmpp], [	: ${LDSHARED='$(LD) -r'}],
 	[atheos*], [	: ${LDSHARED='$(CC) -shared'}
 			rb_cv_dlopen=yes],
+	[wasi*], [	: ${LDSHARED='$(LD) -shared -Xlinker --export-dynamic'}],
 	[	: ${LDSHARED='$(LD)'}])
-  AC_MSG_RESULT($rb_cv_dlopen)
+    AC_MSG_RESULT($rb_cv_dlopen)
+}
 
-  AS_IF([test "$rb_cv_dlopen" = yes], [
+AS_IF([test "$rb_cv_dlopen" = yes], [
     AS_CASE(["$target_os"],
-      [darwin*], [
+    [darwin*], [
+        AC_SUBST(ADDITIONAL_DLDFLAGS, "")
 	for flag in \
-	  "-undefined dynamic_lookup" \
 	  "-multiply_defined suppress" \
+	  "-undefined dynamic_lookup" \
 	  ; do
-	  test "x${linker_flag}" = x || flag="${linker_flag}`echo ${flag} | tr ' ' ,`"
-	  RUBY_TRY_LDFLAGS([$flag], [], [flag=])
-	  AS_IF([test "x$flag" != x], [
-	    RUBY_APPEND_OPTIONS(DLDFLAGS, [$flag])
-	  ])
+            test "x${linker_flag}" = x || flag="${linker_flag}`echo ${flag} | tr ' ' ,`"
+            RUBY_TRY_LDFLAGS([$flag], [], [flag=])
+            AS_IF([test x"$flag" = x], [continue])
+
+            AC_MSG_CHECKING([whether $flag is accepted for bundle])
+            : > conftest.c
+            AS_IF([${LDSHARED%%'$(CC)'*}$CC${LDSHARED@%:@*'$(CC)'} -o conftest.bundle $flag conftest.c >/dev/null 2>conftest.err &&
+                test ! -s conftest.err], [
+                AC_MSG_RESULT([yes])
+                RUBY_APPEND_OPTIONS(DLDFLAGS, [$flag])
+            ], [
+                AC_MSG_RESULT([no])
+                RUBY_APPEND_OPTIONS(ADDITIONAL_DLDFLAGS, [$flag])
+            ])
+            rm -fr conftest.*
 	done
-      ])
-  ])
-
-  AS_IF([test "$enable_rpath:${RPATHFLAG}" = yes:], [
-      AS_IF([test "x$rpathflag" != x], [
-	  RPATHFLAG=" ${rpathflag}%1\$-s"
-      ])
-  ])
-}
+    ])
+])
 
 AS_IF([test "${LDSHAREDXX}" = ""], [
     AS_CASE(["${LDSHARED}"],
@@ -3068,7 +3292,6 @@ AS_IF([test "${LDSHAREDXX}" = ""], [
 	[ld" "*], [
 	    ])
 ])
-AS_CASE([${RPATHFLAG}],[*'%1$'*],[: ${LIBPATHFLAG=' -L%1$-s'}],[: ${LIBPATHFLAG=' -L%s'}])
 
 AC_SUBST(LINK_SO)
 AC_SUBST(LIBPATHFLAG)
@@ -3077,23 +3300,6 @@ AC_SUBST(LIBPATHENV, "${LIBPATHENV-LD_LIBRARY_PATH}")
 AC_SUBST(PRELOADENV, "${PRELOADENV-LD_PRELOAD}")
 AC_SUBST(TRY_LINK)
 
-AS_IF([test "x$OPT_DIR" != x], [
-    pat=`echo "${LDFLAGS_OPTDIR}" | sed ['s/[][\\.*|]/\\\\&/']`
-    LDFLAGS=`echo "${LDFLAGS}" | sed "s| ${pat}||"`
-    val=`IFS="$PATH_SEPARATOR"
-        for dir in $OPT_DIR; do
-            echo x ${LIBPATHFLAG} ${RPATHFLAG} |
-            sed "s/^x *//;s${IFS}"'%1\\$-s'"${IFS}${dir}/lib${IFS}g;s${IFS}%s${IFS}${dir}/lib${IFS}g"
-        done | tr '\012' ' ' | sed 's/ *$//'`
-    AS_IF([test x"$val" != x], [
-	test x"${LDFLAGS}" = x || LDFLAGS="$LDFLAGS "
-	LDFLAGS="$LDFLAGS$val"
-	test x"${DLDFLAGS}" = x || DLDFLAGS="$DLDFLAGS "
-	DLDFLAGS="$DLDFLAGS$val"
-    ])
-    LDFLAGS_OPTDIR="$val"
-])
-
 AS_CASE(["$target_os"],
 [freebsd*], [
     AC_CHECK_LIB([procstat], [procstat_open_sysctl])
@@ -3108,6 +3314,15 @@ AS_CASE(["$target_cpu-$target_os"],
     AS_IF([test "x$ac_cv_header_execinfo_h" = xyes], [
 	AC_CHECK_LIB([execinfo], [backtrace])
 	AC_CHECK_HEADERS([libunwind.h])
+
+    AC_CHECK_HEADERS([mach/task.h mach/mach_init.h mach/mach_port.h])
+    AS_IF([ test \
+        "x${ac_cv_header_mach_task_h}" = xyes -a \
+        "x${ac_cv_header_mach_mach_init_h}" = xyes -a \
+        "x${ac_cv_header_mach_mach_port_h}" = xyes \
+    ], [
+        AC_DEFINE([HAVE_MACH_TASK_EXCEPTION_PORTS], [1])
+    ])
     ])],
 [*-freebsd*|x86_64-netbsd*], [
     AC_CHECK_HEADERS([execinfo.h])
@@ -3196,7 +3411,6 @@ AS_IF([test x$with_valgrind != xno],
 	DLEXT=so])
 : ${SOEXT="${DLEXT}"}
 AC_SUBST(SOEXT)
-}
 
 AS_IF([test "$rb_cv_dlopen:$load_relative" = yes:yes], [
     AS_IF([test "$ac_cv_func_dladdr" = yes], [
@@ -3215,6 +3429,9 @@ AC_DEFINE_UNQUOTED(DLEXT_MAXLEN, `expr $len + 1`)
 test ".$DLEXT"  = "." || AC_DEFINE_UNQUOTED(DLEXT,  ".$DLEXT")
 AC_SUBST(DLEXT)
 
+AC_DEFINE_UNQUOTED(SOEXT, ".$SOEXT")
+}
+
 : "strip" && {
     AC_MSG_CHECKING([for $STRIP flags])
     AC_LINK_IFELSE([AC_LANG_PROGRAM], [AS_IF(
@@ -3237,23 +3454,6 @@ AC_ARG_WITH(ext,
 AC_ARG_WITH(out-ext,
             AS_HELP_STRING([--with-out-ext=EXTS],
                            [pass to --without-ext option of extmk.rb]))
-EXTSTATIC=
-AC_SUBST(EXTSTATIC)dnl
-AC_ARG_WITH(static-linked-ext,
-	    AS_HELP_STRING([--with-static-linked-ext], [link external modules statically]),
-            [AS_CASE([$withval],[yes],[STATIC=;EXTSTATIC=static],[no],[],[EXTSTATIC="$withval"])])
-AS_CASE([",$EXTSTATIC,"], [,static,|*,enc,*], [
-  ENCOBJS='enc/encinit.$(OBJEXT) enc/libenc.$(LIBEXT) enc/libtrans.$(LIBEXT)'
-  EXTOBJS='ext/extinit.$(OBJEXT)'
-  AC_DEFINE_UNQUOTED(EXTSTATIC, 1)
-  AC_SUBST(ENCSTATIC, static)
-], [
-  ENCOBJS='dmyenc.$(OBJEXT)'
-  EXTOBJS='dmyext.$(OBJEXT)'
-])
-AC_SUBST(ENCOBJS)
-AC_SUBST(EXTOBJS)
-
 AC_ARG_WITH(setup,
 	    AS_HELP_STRING([--with-setup=SETUP], [use extension libraries setup]),
 	    [setup=$withval])
@@ -3303,9 +3503,8 @@ for var in bindir includedir libdir rubylibprefix; do
 done
 
 BTESTRUBY='$(MINIRUBY)'
-BOOTSTRAPRUBY='$(BASERUBY)'
 AS_IF([test x"$cross_compiling" = xyes], [
-  test x"$MINIRUBY" = x && MINIRUBY="${RUBY-$BASERUBY} -I`$CHDIR .; pwd` "-r'$(arch)-fake'
+  test x"$MINIRUBY" = x && MINIRUBY="${RUBY-$BASERUBY} -I${ac_abs_builddir-.} "-r'$(arch)-fake'
   XRUBY_LIBDIR=`${RUBY-$BASERUBY} -rrbconfig -e ['puts RbConfig::CONFIG["libdir"]']`
   XRUBY_RUBYLIBDIR=`${RUBY-$BASERUBY} -rrbconfig -e ['puts RbConfig::CONFIG["rubylibdir"]']`
   XRUBY_RUBYHDRDIR=`${RUBY-$BASERUBY} -rrbconfig -e ['puts RbConfig::CONFIG["rubyhdrdir"]']`
@@ -3313,6 +3512,10 @@ AS_IF([test x"$cross_compiling" = xyes], [
   AC_SUBST(XRUBY_RUBYLIBDIR)
   AC_SUBST(XRUBY_RUBYHDRDIR)
   PREP='$(arch)-fake.rb'
+  AS_CASE(["$enable_shared:$EXTSTATIC:$target_os"], [no::darwin*], [
+    # darwin target requires miniruby for linking ext bundles
+    PREP="$PREP"' miniruby$(EXEEXT)'
+  ])
   RUNRUBY_COMMAND='$(MINIRUBY) -I`cd $(srcdir)/lib; pwd`'
   RUNRUBY='$(RUNRUBY_COMMAND)'
   XRUBY='$(MINIRUBY)'
@@ -3326,7 +3529,6 @@ AS_IF([test x"$cross_compiling" = xyes], [
   RUNRUBY_COMMAND='$(MINIRUBY) $(tooldir)/runruby.rb --extout=$(EXTOUT) $(RUNRUBYOPT)'
   RUNRUBY='$(RUNRUBY_COMMAND) --'
   XRUBY='$(RUNRUBY)'
-  AS_CASE(["$HAVE_BASERUBY:$build_os"], [no:*|*:mingw*], [BOOTSTRAPRUBY='$(MINIRUBY)'])
   TEST_RUNNABLE=yes
   CROSS_COMPILING=no
 ])
@@ -3338,10 +3540,8 @@ AC_SUBST(PREP)
 AC_SUBST(RUNRUBY_COMMAND)
 AC_SUBST(RUNRUBY)
 AC_SUBST(XRUBY)
-AC_SUBST(BOOTSTRAPRUBY)
 AC_SUBST(EXTOUT, [${EXTOUT=.ext}])
 
-FIRSTMAKEFILE=""
 LIBRUBY_A='lib$(RUBY_SO_NAME)-static.a'
 LIBRUBY='$(LIBRUBY_A)'
 LIBRUBYARG_STATIC='-l$(RUBY_SO_NAME)-static'
@@ -3361,9 +3561,6 @@ AC_ARG_ENABLE(multiarch,
 	      [multiarch=], [unset multiarch])
 AS_IF([test ${multiarch+set}], [
    AC_DEFINE(ENABLE_MULTIARCH)
-   MJIT_HEADER_INSTALL_DIR=include/'${arch}/${RUBY_VERSION_NAME}'
-], [
-   MJIT_HEADER_INSTALL_DIR=include/'${RUBY_VERSION_NAME}/${arch}'
 ])
 
 archlibdir='${libdir}/${arch}'
@@ -3384,7 +3581,7 @@ AC_ARG_WITH(soname,
 	    ],
 	    [mingw*], [
 		RUBY_SO_NAME="${rb_cv_msvcrt}"'-$(RUBY_BASE_NAME)$(MAJOR)$(MINOR)0'
-		AS_IF([test x"${target_cpu}" != xi386], [
+		AS_IF([test x"${target_cpu}" != xi386 || test x"${rb_cv_msvcrt}" != xmsvcrt], [
 		    RUBY_SO_NAME="${target_cpu}-${RUBY_SO_NAME}"
 		])
 	    ],
@@ -3441,6 +3638,7 @@ AS_CASE("$enable_shared", [yes], [
      ])
     ])
 
+  relative_libprefix="/../${multiarch+../}${libdir_basename}"
   AS_CASE(["$target_os"],
     [sunos4*], [
 	LIBRUBY_ALIASES='$(LIBRUBY_SONAME) lib$(RUBY_SO_NAME).$(SOEXT)'
@@ -3449,7 +3647,7 @@ AS_CASE("$enable_shared", [yes], [
 	RUBY_APPEND_OPTIONS(LIBRUBY_DLDFLAGS, ['-Wl,-soname,$(LIBRUBY_SONAME)' "$LDFLAGS_OPTDIR"])
 	LIBRUBY_ALIASES='$(LIBRUBY_SONAME) lib$(RUBY_SO_NAME).$(SOEXT)'
 	AS_IF([test "$load_relative" = yes], [
-	    libprefix="'\$\${ORIGIN}/../${libdir_basename}'"
+	    libprefix="'\$\${ORIGIN}${relative_libprefix}'"
 	    LIBRUBY_RPATHFLAGS="-Wl,-rpath,${libprefix}"
 	    LIBRUBY_RELATIVE=yes
 	])
@@ -3461,7 +3659,7 @@ AS_CASE("$enable_shared", [yes], [
 	    LIBRUBY_SO="$LIBRUBY_SO.\$(TEENY)"
 	    LIBRUBY_ALIASES=''
 	], [test "$load_relative" = yes], [
-	    libprefix="'\$\$ORIGIN/../${libdir_basename}'"
+	    libprefix="'\$\$ORIGIN${relative_libprefix}'"
 	    LIBRUBY_RPATHFLAGS="-Wl,-rpath,${libprefix}"
 	    LIBRUBY_RELATIVE=yes
 	])
@@ -3485,7 +3683,7 @@ AS_CASE("$enable_shared", [yes], [
 	LIBRUBY_ALIASES='$(LIBRUBY_SONAME) lib$(RUBY_SO_NAME).$(SOEXT)'
 	RUBY_APPEND_OPTIONS(LIBRUBY_DLDFLAGS, ["${linker_flag}-h${linker_flag:+,}"'$(@F)'])
 	AS_IF([test "$load_relative" = yes], [
-	    libprefix="'\$\$ORIGIN/../${libdir_basename}'"
+	    libprefix="'\$\$ORIGIN${relative_libprefix}'"
 	    LIBRUBY_RPATHFLAGS="-R${libprefix}"
 	    LIBRUBY_RELATIVE=yes
 	], [
@@ -3502,7 +3700,7 @@ AS_CASE("$enable_shared", [yes], [
 	LIBRUBY_SONAME='$(LIBRUBY_SO)'
 	LIBRUBY_ALIASES='lib$(RUBY_INSTALL_NAME).$(SOEXT)'
 	AS_IF([test "$load_relative" = yes], [
-	    libprefix="@executable_path/../${libdir_basename}"
+	    libprefix="@executable_path${relative_libprefix}"
 	    LIBRUBY_RELATIVE=yes
 	])
 	LIBRUBY_DLDFLAGS="$LIBRUBY_DLDFLAGS -install_name ${libprefix}"'/$(LIBRUBY_SONAME)'
@@ -3510,6 +3708,7 @@ AS_CASE("$enable_shared", [yes], [
 	LIBRUBY_DLDFLAGS="$LIBRUBY_DLDFLAGS "'-current_version $(RUBY_PROGRAM_VERSION)'
 	AS_IF([test "$visibility_option" = ld], [
 	    LIBRUBY_DLDFLAGS="$LIBRUBY_DLDFLAGS "'-Wl,-unexported_symbol,_Init_*'
+	    LIBRUBY_DLDFLAGS="$LIBRUBY_DLDFLAGS "'-Wl,-unexported_symbol,_InitVM_*'
 	    LIBRUBY_DLDFLAGS="$LIBRUBY_DLDFLAGS "'-Wl,-unexported_symbol,_ruby_static_id_*'
 	    LIBRUBY_DLDFLAGS="$LIBRUBY_DLDFLAGS "'-Wl,-unexported_symbol,*_threadptr_*'
 	])
@@ -3550,16 +3749,16 @@ AS_CASE("$enable_shared", [yes], [
   ])
 ])
 AS_IF([test "$enable_rpath" = yes], [
-    test -z "$LIBRUBY_RPATHFLAGS" || LIBRUBY_RPATHFLAGS="$LIBRUBY_RPATHFLAGS "
-    rpathflag="${RPATHFLAG}"
-    AS_CASE(["${cross_compiling}${load_relative}"], [*yes*], [], [rpathflag="$RPATHFLAG$LIBPATHFLAG"])
+    AS_CASE(["${cross_compiling}${load_relative}"],
+        [*yes*], [rpathflag="${RPATHFLAG}"],
+        [rpathflag="$RPATHFLAG${LIBPATHFLAG:+${RPATHFLAG:+ }$LIBPATHFLAG}"])
     rpathflag=`IFS="$PATH_SEPARATOR"
         echo x "$rpathflag" |
         sed "s/^x *//;s${IFS}"'%1\\$-s'"${IFS}${libprefix}${IFS}g;s${IFS}%s${IFS}${libprefix}${IFS}g"
     `
-    LIBRUBY_RPATHFLAGS="$LIBRUBY_RPATHFLAGS${rpathflag}"
-    LIBRUBYARG_SHARED="$LIBRUBY_RPATHFLAGS $LIBRUBYARG_SHARED"
-    LIBRUBYARG_STATIC="$LIBRUBY_RPATHFLAGS $LIBRUBYARG_STATIC"
+    LIBRUBY_RPATHFLAGS="${LIBRUBY_RPATHFLAGS:+$LIBRUBY_RPATHFLAGS }${rpathflag}"
+    LIBRUBYARG_SHARED="${LIBRUBY_RPATHFLAGS:+$LIBRUBY_RPATHFLAGS }$LIBRUBYARG_SHARED"
+    LIBRUBYARG_STATIC="${LIBRUBY_RPATHFLAGS:+$LIBRUBY_RPATHFLAGS }$LIBRUBYARG_STATIC"
 ])
 AC_SUBST(LIBRUBY_RELATIVE)
 
@@ -3577,7 +3776,7 @@ AS_CASE("$cross_compiling:${LIBPATHENV}", [yes:* | no:], [], [
     AC_MSG_CHECKING(whether wrapper for $LIBPATHENV is needed)
     AS_IF([env ${LIBPATHENV}=/lib /bin/sh -c ': ${'${LIBPATHENV}'?}' 2>/dev/null],
 	[AC_MSG_RESULT(no)],
-	[PREP="$PREP"' exe/$(PROGRAM)'
+	[AC_SUBST(XRUBY_LIBPATHENV_WRAPPER, 'exe/$(PROGRAM)')
 	AC_MSG_RESULT(yes)]
     )
 ])
@@ -3636,14 +3835,15 @@ AC_ARG_ENABLE(gcov,
        AS_HELP_STRING([--enable-gcov], [enable coverage measurement by gcov]),
        [gcov=yes])
 AS_IF([test x"$gcov" = xyes], [
-    CFLAGS="$CFLAGS -coverage"
+    CFLAGS="$CFLAGS -coverage -fprofile-update=atomic"
     LDFLAGS="$LDFLAGS -coverage"
 ])
 
 RUBY_SETJMP_TYPE
+RUBY_MODULAR_GC
 }
 
-: "build section" && {
+[begin]_group "installation section" && {
 dnl build rdoc index if requested
 RDOCTARGET=""
 CAPITARGET=""
@@ -3691,72 +3891,250 @@ AC_SUBST(CAPITARGET)
 AS_CASE(["$RDOCTARGET:$CAPITARGET"],[nodoc:nodoc],[INSTALLDOC=nodoc],[INSTALLDOC=all])
 AC_SUBST(INSTALLDOC)
 
-AC_ARG_ENABLE(jit-support,
-        AS_HELP_STRING([--disable-jit-support], [disable JIT features]),
-        [MJIT_SUPPORT=$enableval],
-        # Enable mjit by default except for WASI
-        [AS_IF([test x"$target_os" != "xwasi"],
-		[MJIT_SUPPORT=yes],
-		[MJIT_SUPPORT=no ])])
+AC_ARG_ENABLE(install-static-library,
+	AS_HELP_STRING([--disable-install-static-library], [do not install static ruby library]),
+	[INSTALL_STATIC_LIBRARY=$enableval
+         AS_IF([test x"$enable_shared" = xno -a x"$INSTALL_STATIC_LIBRARY" = xno],
+                 [AC_MSG_ERROR([must install either static or shared library])],
+                 [])],
+	AS_IF([test x"$enable_shared" = xyes],
+	    [INSTALL_STATIC_LIBRARY=no],
+	    [INSTALL_STATIC_LIBRARY=yes]))
+AC_SUBST(INSTALL_STATIC_LIBRARY)
+}
 
-AS_IF([test x"$MJIT_SUPPORT" = "xyes"],
-	[AC_DEFINE(USE_MJIT, 1)],
-	[AC_DEFINE(USE_MJIT, 0)])
+[begin]_group "JIT section" && {
+AC_CHECK_PROG(RUSTC, [rustc], [rustc], [no]) dnl no ac_tool_prefix
+
+dnl check if rustc is recent enough to build YJIT (rustc >= 1.58.0)
+JIT_RUSTC_OK=no
+JIT_TARGET_ARCH=
+AS_IF([test "$RUSTC" != "no"],
+    AC_MSG_CHECKING([whether ${RUSTC} works for YJIT])
+    AS_CASE(["$target_cpu"],
+        [arm64|aarch64], [JIT_TARGET_ARCH=aarch64],
+        [x86_64], [JIT_TARGET_ARCH=x86_64],
+    )
+    dnl Fails in case rustc target doesn't match ruby target.
+    dnl Can happen on Rosetta, for example.
+    AS_IF([echo "#[cfg(target_arch = \"$JIT_TARGET_ARCH\")] fn main() { let x = 1; format!(\"{x}\"); }" |
+            $RUSTC - --emit asm=/dev/null 2>/dev/null],
+        [JIT_RUSTC_OK=yes]
+    )
+    AC_MSG_RESULT($JIT_RUSTC_OK)
+)
 
-AC_SUBST(MJIT_SUPPORT)
+dnl check if we can build YJIT/ZJIT on this target platform
+dnl we can't easily cross-compile with rustc so we don't support that
+JIT_TARGET_OK=no
+AS_IF([test "$cross_compiling" = no],
+    AS_CASE(["$target_cpu-$target_os"],
+        [*android*], [
+            JIT_TARGET_OK=no
+        ],
+        [arm64-darwin*|aarch64-darwin*|x86_64-darwin*], [
+            JIT_TARGET_OK=yes
+        ],
+        [arm64-*linux*|aarch64-*linux*|x86_64-*linux*], [
+            JIT_TARGET_OK=yes
+        ],
+        [arm64-*bsd*|aarch64-*bsd*|x86_64-*bsd*], [
+            JIT_TARGET_OK=yes
+        ]
+    )
+)
 
+dnl build YJIT in release mode if rustc >= 1.58.0 is present and we are on a supported platform
 AC_ARG_ENABLE(yjit,
-        AS_HELP_STRING([--enable-yjit],
-        [enable experimental in-process JIT compiler that requires Rust build tools [default=no]]),
-        [YJIT_SUPPORT=$enableval], [YJIT_SUPPORT=no])
+    AS_HELP_STRING([--enable-yjit],
+    [enable in-process JIT compiler that requires Rust build tools. enabled by default on supported platforms if rustc 1.58.0+ is available]),
+    [YJIT_SUPPORT=$enableval],
+    [AS_CASE(["$JIT_TARGET_OK:$JIT_RUSTC_OK"],
+        [yes:yes], [
+            YJIT_SUPPORT=yes
+        ],
+        [YJIT_SUPPORT=no]
+    )]
+)
+
+dnl build ZJIT in release mode if rustc >= 1.85.0 is present and we are on a supported platform
+ZJIT_SUPPORT=no
+AC_ARG_ENABLE(zjit,
+    AS_HELP_STRING([--enable-zjit],
+    [enable experimental JIT compiler that requires Rust build tools. enabled by default on supported platforms if rustc 1.85.0+ is available]),
+    [ZJIT_SUPPORT=$enableval],
+    [AS_CASE(["$JIT_TARGET_OK"],
+        [yes], [
+            rb_zjit_build_possible=no
+            AC_MSG_CHECKING([prerequisites for ZJIT])dnl only checked when --enable-zjit is not specified
+            # Fails in case rustc target doesn't match ruby target. Can happen on Rosetta, for example.
+            # 1.85.0 is the first stable version that supports the 2024 edition.
+            AS_IF([test "$RUSTC" != "no" && echo "#[cfg(target_arch = \"$JIT_TARGET_ARCH\")] fn main() {}" |
+                    $RUSTC - --edition=2024 --emit asm=/dev/null 2>/dev/null],
+                AS_IF([test "$gnumake" = "yes"], [
+                    rb_zjit_build_possible=yes
+                ])
+            )
+            AC_MSG_RESULT($rb_zjit_build_possible)
+            ZJIT_SUPPORT=$rb_zjit_build_possible
+        ]
+    )]
+)
 
-CARGO=
 CARGO_BUILD_ARGS=
 YJIT_LIBS=
+JIT_CARGO_SUPPORT=no
 AS_CASE(["${YJIT_SUPPORT}"],
-[yes|dev], [
-    AS_IF([test x"$enable_jit_support" = "xno"],
-        AC_MSG_ERROR([--disable-jit-support but --enable-yjit. YJIT requires JIT support])
-    )
-    AC_CHECK_TOOL(RUSTC, [rustc], [no])
+[yes|dev|stats|dev_nodebug], [
     AS_IF([test x"$RUSTC" = "xno"],
         AC_MSG_ERROR([rustc is required. Installation instructions available at https://www.rust-lang.org/tools/install])
     )
-    AS_IF([test x"$YJIT_SUPPORT" = "xyes"],
-            [rb_rust_target_subdir=release
-             CARGO_BUILD_ARGS='--release'],
-            [rb_rust_target_subdir=debug
-             CARGO_BUILD_ARGS='--features stats,disasm,asm_comments'
-             AC_CHECK_TOOL(CARGO, [cargo], [no])
-             AS_IF([test x"$CARGO" = "xno"],
-                AC_MSG_ERROR([cargo is required. Installation instructions available at https://www.rust-lang.org/tools/install])
-             )
-             AC_DEFINE(RUBY_DEBUG, 1)])
-    YJIT_LIBS="yjit/target/${rb_rust_target_subdir}/libyjit.a"
+
+    AS_CASE(["${YJIT_SUPPORT}"],
+    [yes], [
+    ],
+    [dev], [
+        rb_cargo_features='disasm,runtime_checks'
+        JIT_CARGO_SUPPORT=dev
+	AC_DEFINE(RUBY_DEBUG, 1)
+    ],
+    [dev_nodebug], [
+        rb_cargo_features='disasm'
+        JIT_CARGO_SUPPORT=dev_nodebug
+	AC_DEFINE(YJIT_STATS, 1)
+    ],
+    [stats], [
+        JIT_CARGO_SUPPORT=stats
+	AC_DEFINE(YJIT_STATS, 1)
+    ])
+
+    YJIT_LIBS="target/release/libyjit.a"
+    RUST_LIB='$(YJIT_LIBS)'
     YJIT_OBJ='yjit.$(OBJEXT)'
+    JIT_OBJ='jit.$(OBJEXT)'
+    AS_IF([test x"$YJIT_SUPPORT" != "xyes" ], [
+        AC_DEFINE_UNQUOTED(YJIT_SUPPORT, [$YJIT_SUPPORT])
+    ])
     AC_DEFINE(USE_YJIT, 1)
-], [AC_DEFINE(USE_YJIT, 0)])
+], [
+    AC_DEFINE(USE_YJIT, 0)
+])
 
+ZJIT_LIBS=
+AS_CASE(["${ZJIT_SUPPORT}"],
+[yes|dev|dev_nodebug|stats], [
+    AS_IF([test x"$RUSTC" = "xno"],
+        AC_MSG_ERROR([rustc is required. Installation instructions available at https://www.rust-lang.org/tools/install])
+    )
+
+    AS_CASE(["${ZJIT_SUPPORT}"],
+    [yes], [
+    ],
+    [dev], [
+        rb_cargo_features="$rb_cargo_features,disasm,runtime_checks"
+        JIT_CARGO_SUPPORT=dev
+        AC_DEFINE(RUBY_DEBUG, 1)
+    ],
+    [dev_nodebug], [
+        rb_cargo_features="$rb_cargo_features,disasm"
+        JIT_CARGO_SUPPORT=dev_nodebug
+        AC_DEFINE(ZJIT_STATS, 1)
+    ],
+    [stats], [
+        JIT_CARGO_SUPPORT=stats
+        AC_DEFINE(ZJIT_STATS, 1)
+    ])
+
+    ZJIT_LIBS="target/release/libzjit.a"
+    RUST_LIB='$(ZJIT_LIBS)'
+    ZJIT_OBJ='zjit.$(OBJEXT)'
+    JIT_OBJ='jit.$(OBJEXT)'
+    AS_IF([test x"$ZJIT_SUPPORT" != "xyes" ], [
+        AC_DEFINE_UNQUOTED(ZJIT_SUPPORT, [$ZJIT_SUPPORT])
+    ])
+    AC_DEFINE(USE_ZJIT, 1)
+], [
+    AC_DEFINE(USE_ZJIT, 0)
+])
+
+RUSTC_FLAGS='-g -C lto=thin -C opt-level=3 -C overflow-checks=on'
+AS_IF([test -n "${rustc_flags}"], [
+    RUSTC_FLAGS="${RUSTC_FLAGS} ${rustc_flags}"
+])
+
+JIT_RUST_FLAGS='--crate-type=staticlib --cfg feature=\"stats_allocator\"'
+RLIB_DIR=
+AS_CASE(["$JIT_CARGO_SUPPORT:$YJIT_SUPPORT:$ZJIT_SUPPORT"],
+[no:yes:yes], [ # release build of YJIT+ZJIT
+    YJIT_LIBS=
+    ZJIT_LIBS=
+    JIT_RUST_FLAGS="--crate-type=rlib"
+    RLIB_DIR="target/release"
+    RUST_LIB="target/release/libruby.a"
+],
+[no:*], [],
+[ # JIT_CARGO_SUPPORT not "no" -- cargo required.
+    AC_CHECK_TOOL(CARGO, [cargo], [no])
+    AS_IF([test x"$CARGO" = "xno"],
+        AC_MSG_ERROR([this build configuration requires cargo. Installation instructions available at https://www.rust-lang.org/tools/install]))
+
+    YJIT_LIBS=
+    ZJIT_LIBS=
+
+    # There's more processing below to get the feature set for the
+    # top-level crate, so capture at this point for feature set of
+    # just the zjit crate.
+    ZJIT_TEST_FEATURES="${rb_cargo_features}"
+
+    AS_IF([test x"${YJIT_SUPPORT}" != x"no"], [
+        rb_cargo_features="$rb_cargo_features,yjit"
+    ])
+    AS_IF([test x"${ZJIT_SUPPORT}" != x"no"], [
+        AC_SUBST(ZJIT_TEST_FEATURES)
+        rb_cargo_features="$rb_cargo_features,zjit"
+    ])
+    # if YJIT and ZJIT release mode
+    AS_IF([test "${YJIT_SUPPORT}:${ZJIT_SUPPORT}" = "yes:yes"], [
+        JIT_CARGO_SUPPORT=release
+    ])
+    CARGO_BUILD_ARGS="--profile ${JIT_CARGO_SUPPORT} --features ${rb_cargo_features}"
+    AS_IF([test "${JIT_CARGO_SUPPORT}" = "dev"], [
+        RUST_LIB="target/debug/libruby.a"
+    ], [
+        RUST_LIB="target/${JIT_CARGO_SUPPORT}/libruby.a"
+    ])
+])
+
+# In case either we're linking rust code
+AS_IF([test -n "$RUST_LIB"], [
+    AS_CASE(["$target_os"],[openbsd*],[
+        # Link libc++abi (which requires libpthread) for _Unwind_* functions needed by rust stdlib
+        LDFLAGS="$LDFLAGS -lpthread -lc++abi"
+    ])
+
+    # absolute path to stop the "target" dir in src dir from interfering through VPATH
+    RUST_LIB="$(pwd)/${RUST_LIB}"
+])
 
 dnl These variables end up in ::RbConfig::CONFIG
-AC_SUBST(YJIT_SUPPORT)dnl what flavor of YJIT the Ruby build includes
 AC_SUBST(RUSTC)dnl Rust compiler command
+AC_SUBST(JIT_RUST_FLAGS)dnl the common rustc flags for JIT crates such as zjit
+AC_SUBST(RUSTC_FLAGS)dnl user-configurable rustc compiler flags
 AC_SUBST(CARGO)dnl Cargo command for Rust builds
 AC_SUBST(CARGO_BUILD_ARGS)dnl for selecting Rust build profiles
-AC_SUBST(YJIT_LIBS)dnl for optionally building the Rust parts of YJIT
+AC_SUBST(YJIT_SUPPORT)dnl what flavor of YJIT the Ruby build includes
+AC_SUBST(YJIT_LIBS)dnl the .a library of YJIT
 AC_SUBST(YJIT_OBJ)dnl for optionally building the C parts of YJIT
+AC_SUBST(ZJIT_SUPPORT)dnl what flavor of ZJIT the Ruby build includes
+AC_SUBST(ZJIT_LIBS)dnl path to the .a library of ZJIT
+AC_SUBST(ZJIT_OBJ)dnl for optionally building the C parts of ZJIT
+AC_SUBST(JIT_OBJ)dnl for optionally building C glue code for Rust FFI
+AC_SUBST(RUST_LIB)dnl path to the rust .a library that contains either or both JITs
+AC_SUBST(RLIB_DIR)dnl subpath of build directory for .rlib files
+AC_SUBST(JIT_CARGO_SUPPORT)dnl "no" or the cargo profile of the rust code
+}
 
-AC_ARG_ENABLE(install-static-library,
-	AS_HELP_STRING([--disable-install-static-library], [do not install static ruby library]),
-	[INSTALL_STATIC_LIBRARY=$enableval
-         AS_IF([test x"$enable_shared" = xno -a x"$INSTALL_STATIC_LIBRARY" = xno],
-                 [AC_MSG_ERROR([must install either static or shared library])],
-                 [])],
-	AS_IF([test x"$enable_shared" = xyes],
-	    [INSTALL_STATIC_LIBRARY=no],
-	    [INSTALL_STATIC_LIBRARY=yes]))
-AC_SUBST(INSTALL_STATIC_LIBRARY)
-
+[begin]_group "build section" && {
 AC_CACHE_CHECK([for prefix of external symbols], rb_cv_symbol_prefix, [
     AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[extern void conftest_external(void) {}]], [[]])],[
 	rb_cv_symbol_prefix=`$NM conftest.$ac_objext |
@@ -3767,6 +4145,25 @@ AC_CACHE_CHECK([for prefix of external symbols], rb_cv_symbol_prefix, [
 ])
 SYMBOL_PREFIX="$rb_cv_symbol_prefix"
 test "x$SYMBOL_PREFIX" = xNONE && SYMBOL_PREFIX=''
+
+AS_IF([test x"$SOEXT" = xdll], [
+    # DLL on Windows is managed by win32/mkexports.rb
+], [test x"$enable_shared" = xyes], [
+    AC_CACHE_CHECK([for default symbols in empty shared library], rb_cv_symbols_in_emptylib, [
+        save_CC="$CC"
+        eval CC=\"`printf "%s" "${DLDSHARED}" | sed ['s/\$(CC)/${CC}/']`\"
+        AC_LINK_IFELSE([AC_LANG_PROGRAM()],[
+            rb_cv_symbols_in_emptylib=`$NM -Pgp conftest$ac_exeext |
+                sed ["/ [A-TV-Z] .*/!d;s///;s/^${SYMBOL_PREFIX}//;/^main$/d"]`
+        ])
+        set dummy ${rb_cv_symbols_in_emptylib}
+        shift
+        rb_cv_symbols_in_emptylib="$*"
+        CC="$save_CC"
+    ])
+])
+AC_SUBST(XSYMBOLS_IN_EMPTYLIB, "${rb_cv_symbols_in_emptylib}")
+
 DLNOBJ=dln.o
 AC_ARG_ENABLE(dln,
 	      AS_HELP_STRING([--disable-dln], [disable dynamic link feature]),
@@ -3781,14 +4178,28 @@ AS_CASE(["$target_os"],
 	RUBY_APPEND_OPTION(CFLAGS, -pipe)
 	],
     [darwin*], [
-	RUBY_APPEND_OPTION(CFLAGS, -pipe)
+	RUBY_TRY_CFLAGS(-pipe, [pipe_opt=yes], [pipe_opt=no])
+	AS_IF([test $pipe_opt = yes], [RUBY_APPEND_OPTION(CFLAGS, -pipe)])
+        AC_MSG_CHECKING([whether Security framework is needed])
 	AC_COMPILE_IFELSE([
-	    AC_LANG_BOOL_COMPILE_TRY([@%:@include <AvailabilityMacros.h>],
-		[MAC_OS_X_VERSION_MIN_REQUIRED >= MAC_OS_X_VERSION_10_7 &&
-		 MAC_OS_X_VERSION_MIN_REQUIRED < MAC_OS_X_VERSION_10_10])],
+	    AC_LANG_BOOL_COMPILE_TRY([
+@%:@include <AvailabilityMacros.h>
+enum {
+    least = MAC_OS_X_VERSION_10_7, /* just fail if undefined */
+    required = MAC_OS_X_VERSION_MIN_REQUIRED,
+    upper /* bigger than MIN_REQUIRED, or */
+@%:@ifdef MAC_OS_X_VERSION_10_10
+        = MAC_OS_X_VERSION_10_10
+@%:@endif
+};],
+	    [required >= least && required < upper])],
 	    [dnl
+		AC_MSG_RESULT(yes)
 		RUBY_APPEND_OPTION(XLDFLAGS, [-framework Security])
 		RUBY_APPEND_OPTION(LIBRUBYARG_STATIC, [-framework Security])
+	    ],dnl
+	    [dnl
+		AC_MSG_RESULT(no)
 	    ]dnl
 	)
 	RUBY_APPEND_OPTION(XLDFLAGS, [-framework CoreFoundation])
@@ -3821,6 +4232,7 @@ AS_CASE(["$target_os"],
 	[mingw*], [
 	    AS_IF([test x"$enable_shared" = xyes], [
 		LIBRUBY_SO='$(RUBY_SO_NAME)'.dll
+		LIBRUBY_SONAME=''
 		LIBRUBY_DLDFLAGS="${LIBRUBY_DLDFLAGS}"' $(RUBYDEF)'
 	    ])
 	    EXPORT_PREFIX=' '
@@ -3833,7 +4245,6 @@ AS_CASE(["$target_os"],
 	    PLATFORM_DIR=win32
 	    ])
 	LIBRUBY_ALIASES=''
-	FIRSTMAKEFILE=GNUmakefile:cygwin/GNUmakefile.in
 	AS_IF([test x"$enable_shared" = xyes], [
 	    LIBRUBY='lib$(RUBY_SO_NAME).dll.a'
 	], [
@@ -3843,7 +4254,6 @@ AS_CASE(["$target_os"],
 	])
 	],
     [wasi*], [
-        FIRSTMAKEFILE=GNUmakefile:wasm/GNUmakefile.in
         AC_LIBOBJ([wasm/missing])
         AC_LIBOBJ([wasm/runtime])
         AC_LIBOBJ([wasm/fiber])
@@ -3860,21 +4270,6 @@ AC_ARG_ENABLE(debug-env,
        AS_HELP_STRING([--enable-debug-env], [enable RUBY_DEBUG environment variable]),
        [AC_SUBST(ENABLE_DEBUG_ENV, yes)])
 
-AS_CASE(["$FIRSTMAKEFILE"], [*GNUmakefile:*], [gnumake=yes], [
-    AC_MSG_CHECKING([if ${MAKE-make} is GNU make])
-    mkdir conftest.dir
-    echo "all:; @echo yes" > conftest.dir/GNUmakefile
-    echo "all:; @echo no" > conftest.dir/Makefile
-    gnumake=`(cd conftest.dir; ${MAKE-make})`
-    rm -fr conftest.dir
-    AS_CASE(["$gnumake"],
-    [*yes*], [
-	FIRSTMAKEFILE=GNUmakefile:template/GNUmakefile.in
-	gnumake=yes],
-    [
-	gnumake=no])
-    AC_MSG_RESULT($gnumake)
-])
 AS_IF([test "$gnumake" = yes], [ NULLCMD=: ], [
     AC_MSG_CHECKING([for safe null command for ${MAKE-make}])
     mkdir conftest.dir
@@ -3931,8 +4326,9 @@ AS_IF([test "${universal_binary-no}" = yes ], [
 		const char arch[[]] = __ARCHITECTURE__;]], [[puts(arch);]])],
 		[rb_cv_architecture_available=yes], [rb_cv_architecture_available=no]))
 ])
+}
 
-: ${MJIT_LDSHARED=`echo "$LDSHARED" | sed ['s|\$(LD)|'"${LD}"'|g;s|\$(CC)|$(MJIT_CC)|g']`}
+[end]_group
 
 MAINLIBS="$LIBS"
 LIBS=$ORIG_LIBS
@@ -3957,15 +4353,34 @@ AS_IF([test "${ARCH_FLAG}"], [
     CXXFLAGS=`echo "$CXXFLAGS" | sed "s| *$archflagpat"'||'`
     LDFLAGS=`echo "$LDFLAGS" | sed "s| *$archflagpat"'||'`
 ])
+AS_CASE([" $rb_cv_warnflags "], [*" -Wshorten-64-to-32 "*|*" -Werror=shorten-64-to-32 "*], [
+    voidp_ll=
+    AS_CASE([$ac_cv_sizeof_voidp],
+    [SIZEOF_LONG_LONG], [voidp_ll=true],
+    [@<:@0-9@:>@*], [
+        AS_IF([test $ac_cv_sizeof_voidp -gt $ac_cv_sizeof_long], [voidp_ll=true])
+    ])
+    AS_IF([test "$voidp_ll"], [
+        # Disable the shorten-64-to-32 warning for now, because it currently
+        # generates a lot of warnings on platforms where `sizeof(void*)` is
+        # larger than `sizeof(long)`.
+        #
+        # TODO: Replace `long` with `ptrdiff_t` or something in the all sources.
+        rb_cv_warnflags=`echo "$rb_cv_warnflags" |
+           sed -e 's/ -W\(shorten-64-to-32 \)/ -Wno-\1/' \
+               -e 's/ -Werror=\(shorten-64-to-32 \)/ -Wno-\1/'`
+    ])
+])
 rb_cv_warnflags=`echo "$rb_cv_warnflags" | sed 's/^ *//;s/ *$//'`
 warnflags="$rb_cv_warnflags"
 AC_SUBST(cppflags)dnl
-AC_SUBST(cflags, ["${orig_cflags:+$orig_cflags }"'${optflags} ${debugflags} ${warnflags}'])dnl
+AC_SUBST(cflags, ['${hardenflags} '"${orig_cflags:+$orig_cflags }"' ${optflags} ${debugflags} ${warnflags}'])dnl
 AC_SUBST(cxxflags)dnl
 AC_SUBST(optflags)dnl
 AC_SUBST(debugflags)dnl
 AC_SUBST(warnflags)dnl
 AC_SUBST(strict_warnflags)dnl
+AC_SUBST(hardenflags)dnl
 AC_SUBST(XCFLAGS)dnl
 AC_SUBST(XLDFLAGS)dnl
 AC_SUBST(EXTLDFLAGS)dnl
@@ -3996,6 +4411,7 @@ AC_SUBST(EXPORT_PREFIX)
 AC_SUBST(SYMBOL_PREFIX)
 AC_SUBST(MINIOBJS)
 AC_SUBST(THREAD_MODEL)
+AC_SUBST(COROUTINE_TYPE, ${coroutine_type})
 AC_SUBST(PLATFORM_DIR)
 
 firstmf=`echo $FIRSTMAKEFILE | sed 's/:.*//'`
@@ -4056,6 +4472,7 @@ AS_CASE(["$ruby_version"],
 AS_IF([test ${RUBY_LIB_VERSION_STYLE+set}], [
     {
     echo "#define RUBY_LIB_VERSION_STYLE $RUBY_LIB_VERSION_STYLE"
+    echo '@%:@include "confdefs.h"'
     echo '#define STRINGIZE(x) x'
     test -f revision.h -o -f "${srcdir}/revision.h" || echo '#define RUBY_REVISION 0'
     echo '#include "version.h"'
@@ -4147,6 +4564,10 @@ AS_IF([test "${universal_binary-no}" = yes ], [
         arch="${target_cpu}-${target_os}"
     ])
     AC_DEFINE_UNQUOTED(RUBY_PLATFORM, "$arch")
+
+    AS_IF([test "$arch" = "s390x-linux"], [
+       AC_DEFINE_UNQUOTED(USE_MN_THREADS, 0)
+    ])
 ])
 
 unset sitearch
@@ -4227,6 +4648,13 @@ AS_IF([test -z "$MANTYPE"], [
 ])
 AC_SUBST(MANTYPE)
 
+MKMF_VERBOSE=0
+AC_ARG_ENABLE(mkmf-verbose,
+    AS_HELP_STRING([--enable-mkmf-verbose], [enable verbose in mkmf]),
+    [MKMF_VERBOSE=1],
+    [MKMF_VERBOSE=0])
+AC_SUBST(MKMF_VERBOSE)
+
 AC_ARG_ENABLE(rubygems,
 	AS_HELP_STRING([--disable-rubygems], [disable rubygems by default]),
 	[enable_rubygems="$enableval"], [enable_rubygems=yes])
@@ -4237,6 +4665,17 @@ AS_IF([test x"$enable_rubygems" = xno], [
 ])
 AC_SUBST(USE_RUBYGEMS)
 
+m4_define(available_parsers, [parse.y, prism])
+AC_ARG_WITH(parser,
+    AS_HELP_STRING([--with-parser=PARSER],
+        [specify default parser; PARSER is one of ]m4_join([, ],available_parsers)),
+    [], [with_parser=prism])
+AS_CASE([$with_parser],
+m4_foreach(parser, [available_parsers],
+    parser[,][AC_DEFINE_UNQUOTED(RB_DEFAULT_PARSER, RB_DEFAULT_PARSER_[]AS_TR_CPP(parser)),])
+    [AC_MSG_ERROR([Unknown parser: $with_parser])]
+)
+
 arch_hdrdir="${EXTOUT}/include/${arch}/ruby"
 AS_MKDIR_P("${arch_hdrdir}")
 config_h="${arch_hdrdir}/config.h"
@@ -4244,7 +4683,7 @@ guard=INCLUDE_RUBY_CONFIG_H
 {
   echo "#ifndef $guard"
   echo "#define $guard 1"
-  grep -v "^#define PACKAGE_" confdefs.h
+  sed "/^@%:@define PACKAGE_/d;s/  *$//" confdefs.h
   echo "#endif /* $guard */"
 } | tr -d '\015' |
 (
@@ -4287,6 +4726,14 @@ AC_SUBST(XCC_WRAPPER)
 
 AS_CASE([" $CPP "], [*" $CC "*], [CPP=`echo " $CPP " | sed "s| $CC |"' $(CC) |;s/^ *//;s/  *$//'`])
 
+AS_IF([test ! -f "$srcdir/revision.h"], [
+    AS_IF([test "x$HAVE_BASERUBY" = xyes], [
+	${BASERUBY} -C "$srcdir" tool/file2lastrev.rb -q --revision.h > "$srcdir/revision.h"
+    ], [
+	touch "$srcdir/revision.h"
+    ])
+])
+
 AS_IF([test x"$firstmf" != x], [
     AC_CONFIG_FILES($firstmf:$firsttmpl, [], [firstmf="$firstmf" firsttmpl="$firsttmpl"])
 ])
@@ -4303,35 +4750,36 @@ AC_CONFIG_FILES(Makefile:template/Makefile.in, [
 	AS_CASE("$VCS",
 		['$(GIT)'|git], [VCSUP='$(VCS) pull --rebase $(GITPULLOPTIONS)'],
 		[VCSUP='$(VCS)'])
-	sed -n \
-	    -e '[/^@%:@define \(RUBY_RELEASE_[A-Z]*\) \([0-9][0-9]*\)/]{' \
-	    -e   's//\1 = \2/' \
-	    -e   '[s/ \([0-9]\)$/ 0\1/]' \
-	    -e   p \
-	    -e '}' "$srcdir/version.h"
+	for f in "$srcdir/version.h" "$srcdir/revision.h"; do
+            test -f "$f" || continue
+	    sed -n \
+	        -e '[/^@%:@define \(RUBY_RELEASE_[A-Z]*\) \([0-9][0-9]*\)/]{' \
+	        -e   's//\1 = \2/' \
+	        -e   '[s/ \([0-9]\)$/ 0\1/]' \
+	        -e   p \
+	        -e '}' "$f"
+        done
 	sed '/^MISSING/s/\$U\././g;/^VCS *=/s#@VCS@#'"$VCS"'#;/^VCSUP *=/s#@VCSUP@#'"$VCSUP"'#' Makefile
 	echo; test x"$EXEEXT" = x || echo 'miniruby: miniruby$(EXEEXT)'
 	AS_IF([test "$gnumake" != yes], [
-	    echo ['$(MKFILES): $(srcdir)/common.mk']
-	    sed ['s/{\$([^(){}]*)[^{}]*}//g'] ${srcdir}/common.mk
+	    # extract NMake-style include list
+	    set = `sed -n 's/^!include  *//p' ${srcdir}/common.mk`
+	    echo common_mk_includes "@S|@*" # generate the macro assignment
+	    shift
+	    common_mk_includes="`echo \"@S|@*\" | sed 's|\$(srcdir)|.|g'`"
+	    (PWD= cd ${srcdir} && sed -f tool/prereq.status common.mk ${common_mk_includes})
+            AS_IF([test "$YJIT_SUPPORT" = yes], [
+                cat ${srcdir}/yjit/not_gmake.mk
+                echo ['$(MKFILES): ${srcdir}/yjit/not_gmake.mk']
+            ])
 	], [
 	    echo 'distclean-local::; @$(RM) GNUmakefile uncommon.mk'
 	])
-    } > $tmpmk && AS_IF([! grep '^ruby:' $tmpmk > /dev/null], [
-	AS_IF([test "${gnumake}" = yes], [
-	    tmpgmk=confgmk$$.tmp
-	    {
-		echo "include $tmpmk"
-		echo "-include uncommon.mk"
-	    } > $tmpgmk
-	], [
-	    tmpgmk=$tmpmk
-	]) &&
-	test -z "`${MAKE-make} -f $tmpgmk info-program | grep '^PROGRAM=ruby$'`" &&
-	echo 'ruby: $(PROGRAM);' >> $tmpmk
-	test "$tmpmk" = "$tmpgmk" || rm -f "$tmpgmk"
-    ]) && mv -f $tmpmk Makefile],
-[EXEEXT='$EXEEXT' MAKE='${MAKE-make}' gnumake='$gnumake' GIT='$GIT'])
+
+	echo; echo '$(srcdir)/$(CONFIGURE):RUBY_M4_INCLUDED \
+	$(empty)'
+    } > $tmpmk && mv -f $tmpmk Makefile],
+[EXEEXT='$EXEEXT' MAKE='${MAKE-make}' gnumake='$gnumake' GIT='$GIT' YJIT_SUPPORT='$YJIT_SUPPORT'])
 
 AC_ARG_WITH([ruby-pc],
 	    AS_HELP_STRING([--with-ruby-pc=FILENAME], [pc file basename]),
@@ -4345,9 +4793,13 @@ AC_ARG_WITH(destdir,
 	    [DESTDIR="$withval"])
 AC_SUBST(DESTDIR)
 
+AS_IF([test "x$load_relative:$DESTDIR" = xyes:], [
+    AS_IF([test "x$prefix" = xNONE], [DESTDIR="$ac_default_prefix"], [DESTDIR="$prefix"])
+    prefix=/.
+])
+
 AC_OUTPUT
 }
-}
 
 AS_IF([test "$silent" = yes], [], [
 AS_IF([${FOLD+:} false], [], [
@@ -4384,6 +4836,7 @@ config_summary "target OS"           "$target_os"
 config_summary "compiler"            "$CC"
 config_summary "with thread"         "$THREAD_MODEL"
 config_summary "with coroutine"      "$coroutine_type"
+config_summary "with modular GC"     "$modular_gc_summary"
 config_summary "enable shared libs"  "$ENABLE_SHARED"
 config_summary "dynamic library ext" "$DLEXT"
 config_summary "CFLAGS"              "$cflags"
@@ -4393,10 +4846,12 @@ config_summary "DLDFLAGS"            "$DLDFLAGS"
 config_summary "optflags"            "$optflags"
 config_summary "debugflags"          "$debugflags"
 config_summary "warnflags"           "$warnflags"
+config_summary "hardenflags"         "$hardenflags"
 config_summary "strip command"       "$STRIP"
 config_summary "install doc"         "$DOCTARGETS"
-config_summary "JIT support"         "$MJIT_SUPPORT"
 config_summary "YJIT support"        "$YJIT_SUPPORT"
+config_summary "ZJIT support"        "$ZJIT_SUPPORT"
+config_summary "RUSTC_FLAGS"         "$RUSTC_FLAGS"
 config_summary "man page type"       "$MANTYPE"
 config_summary "search path"         "$search_path"
 config_summary "static-linked-ext"   ${EXTSTATIC:+"yes"}
diff --git a/constant.h b/constant.h
index e0d36909e1..90a68d447a 100644
--- a/constant.h
+++ b/constant.h
@@ -43,13 +43,11 @@ VALUE rb_mod_deprecate_constant(int argc, const VALUE *argv, VALUE obj);
 void rb_free_const_table(struct rb_id_table *tbl);
 VALUE rb_const_source_location(VALUE, ID);
 
-MJIT_SYMBOL_EXPORT_BEGIN
 int rb_autoloading_value(VALUE mod, ID id, VALUE *value, rb_const_flag_t *flag);
 rb_const_entry_t *rb_const_lookup(VALUE klass, ID id);
 VALUE rb_public_const_get_at(VALUE klass, ID id);
 VALUE rb_public_const_get_from(VALUE klass, ID id);
 int rb_public_const_defined_from(VALUE klass, ID id);
 VALUE rb_const_source_location_at(VALUE, ID);
-MJIT_SYMBOL_EXPORT_END
 
 #endif /* CONSTANT_H */
diff --git a/cont.c b/cont.c
index ee7b856bb1..8af093a316 100644
--- a/cont.c
+++ b/cont.c
@@ -26,14 +26,19 @@ extern int madvise(caddr_t, size_t, int);
 #include COROUTINE_H
 
 #include "eval_intern.h"
-#include "gc.h"
 #include "internal.h"
 #include "internal/cont.h"
+#include "internal/thread.h"
+#include "internal/error.h"
+#include "internal/eval.h"
+#include "internal/gc.h"
 #include "internal/proc.h"
+#include "internal/sanitizers.h"
 #include "internal/warnings.h"
 #include "ruby/fiber/scheduler.h"
-#include "mjit.h"
+#include "yjit.h"
 #include "vm_core.h"
+#include "vm_sync.h"
 #include "id_table.h"
 #include "ractor_core.h"
 
@@ -43,7 +48,8 @@ static const int DEBUG = 0;
 #define RB_PAGE_MASK (~(RB_PAGE_SIZE - 1))
 static long pagesize;
 
-static const rb_data_type_t cont_data_type, fiber_data_type;
+static const rb_data_type_t rb_cont_data_type;
+static const rb_data_type_t rb_fiber_data_type;
 static VALUE rb_cContinuation;
 static VALUE rb_cFiber;
 static VALUE rb_eFiberError;
@@ -172,7 +178,7 @@ struct fiber_pool {
     // A singly-linked list of allocations which contain 1 or more stacks each.
     struct fiber_pool_allocation * allocations;
 
-    // Provides O(1) stack "allocation":
+    // Free list that provides O(1) stack "allocation".
     struct fiber_pool_vacancy * vacancies;
 
     // The size of the stack allocations (excluding any guard page).
@@ -184,16 +190,27 @@ struct fiber_pool {
     // The initial number of stacks to allocate.
     size_t initial_count;
 
-    // Whether to madvise(free) the stack or not:
+    // Whether to madvise(free) the stack or not.
+    // If this value is set to 1, the stack will be madvise(free)ed
+    // (or equivalent), where possible, when it is returned to the pool.
     int free_stacks;
 
     // The number of stacks that have been used in this pool.
     size_t used;
 
-    // The amount to allocate for the vm_stack:
+    // The amount to allocate for the vm_stack.
     size_t vm_stack_size;
 };
 
+// Continuation contexts used by JITs
+struct rb_jit_cont {
+    rb_execution_context_t *ec; // continuation ec
+    struct rb_jit_cont *prev, *next; // used to form lists
+};
+
+// Doubly linked list for enumerating all on-stack ISEQs.
+static struct rb_jit_cont *first_jit_cont;
+
 typedef struct rb_context_struct {
     enum context_type type;
     int argc;
@@ -210,23 +227,21 @@ typedef struct rb_context_struct {
     } machine;
     rb_execution_context_t saved_ec;
     rb_jmpbuf_t jmpbuf;
-    rb_ensure_entry_t *ensure_array;
-    /* Pointer to MJIT info about the continuation.  */
-    struct mjit_cont *mjit_cont;
+    struct rb_jit_cont *jit_cont; // Continuation contexts for JITs
 } rb_context_t;
 
-
 /*
  * Fiber status:
- *    [Fiber.new] ------> FIBER_CREATED
- *                        | [Fiber#resume]
- *                        v
- *                   +--> FIBER_RESUMED ----+
- *    [Fiber#resume] |    | [Fiber.yield]   |
- *                   |    v                 |
- *                   +-- FIBER_SUSPENDED    | [Terminate]
- *                                          |
- *                       FIBER_TERMINATED <-+
+ *    [Fiber.new] ------> FIBER_CREATED ----> [Fiber#kill] --> |
+ *                        | [Fiber#resume]                     |
+ *                        v                                    |
+ *                   +--> FIBER_RESUMED ----> [return] ------> |
+ *    [Fiber#resume] |    | [Fiber.yield/transfer]             |
+ *  [Fiber#transfer] |    v                                    |
+ *                   +--- FIBER_SUSPENDED --> [Fiber#kill] --> |
+ *                                                             |
+ *                                                             |
+ *                        FIBER_TERMINATED <-------------------+
  */
 enum fiber_status {
     FIBER_CREATED,
@@ -252,13 +267,26 @@ struct rb_fiber_struct {
     unsigned int yielding : 1;
     unsigned int blocking : 1;
 
+    unsigned int killed : 1;
+
     struct coroutine_context context;
     struct fiber_pool_stack stack;
 };
 
 static struct fiber_pool shared_fiber_pool = {NULL, NULL, 0, 0, 0, 0};
 
-static ID fiber_initialize_keywords[2] = {0};
+void
+rb_free_shared_fiber_pool(void)
+{
+    struct fiber_pool_allocation *allocations = shared_fiber_pool.allocations;
+    while (allocations) {
+        struct fiber_pool_allocation *next = allocations->next;
+        xfree(allocations);
+        allocations = next;
+    }
+}
+
+static ID fiber_initialize_keywords[3] = {0};
 
 /*
  * FreeBSD require a first (i.e. addr) argument of mmap(2) is not NULL
@@ -274,7 +302,6 @@ static ID fiber_initialize_keywords[2] = {0};
 #define ERRNOMSG strerror(errno)
 
 // Locates the stack vacancy details for the given stack.
-// Requires that fiber_pool_vacancy fits within one page.
 inline static struct fiber_pool_vacancy *
 fiber_pool_vacancy_pointer(void * base, size_t size)
 {
@@ -285,6 +312,24 @@ fiber_pool_vacancy_pointer(void * base, size_t size)
     );
 }
 
+#if defined(COROUTINE_SANITIZE_ADDRESS)
+// Compute the base pointer for a vacant stack, for the area which can be poisoned.
+inline static void *
+fiber_pool_stack_poison_base(struct fiber_pool_stack * stack)
+{
+    STACK_GROW_DIR_DETECTION;
+
+    return (char*)stack->base + STACK_DIR_UPPER(RB_PAGE_SIZE, 0);
+}
+
+// Compute the size of the vacant stack, for the area that can be poisoned.
+inline static size_t
+fiber_pool_stack_poison_size(struct fiber_pool_stack * stack)
+{
+    return stack->size - RB_PAGE_SIZE;
+}
+#endif
+
 // Reset the current stack pointer and available size of the given stack.
 inline static void
 fiber_pool_stack_reset(struct fiber_pool_stack * stack)
@@ -436,18 +481,20 @@ fiber_pool_allocate_memory(size_t * count, size_t stride)
         }
 #else
         errno = 0;
-        void * base = mmap(NULL, (*count)*stride, PROT_READ | PROT_WRITE, FIBER_STACK_FLAGS, -1, 0);
+        size_t mmap_size = (*count)*stride;
+        void * base = mmap(NULL, mmap_size, PROT_READ | PROT_WRITE, FIBER_STACK_FLAGS, -1, 0);
 
         if (base == MAP_FAILED) {
             // If the allocation fails, count = count / 2, and try again.
             *count = (*count) >> 1;
         }
         else {
+            ruby_annotate_mmap(base, mmap_size, "Ruby:fiber_pool_allocate_memory");
 #if defined(MADV_FREE_REUSE)
             // On Mac MADV_FREE_REUSE is necessary for the task_info api
             // to keep the accounting accurate as possible when a page is marked as reusable
             // it can possibly not occurring at first call thus re-iterating if necessary.
-            while (madvise(base, (*count)*stride, MADV_FREE_REUSE) == -1 && errno == EAGAIN);
+            while (madvise(base, mmap_size, MADV_FREE_REUSE) == -1 && errno == EAGAIN);
 #endif
             return base;
         }
@@ -464,80 +511,87 @@ fiber_pool_allocate_memory(size_t * count, size_t stride)
 static struct fiber_pool_allocation *
 fiber_pool_expand(struct fiber_pool * fiber_pool, size_t count)
 {
-    STACK_GROW_DIR_DETECTION;
+    struct fiber_pool_allocation * allocation;
+    RB_VM_LOCK_ENTER();
+    {
+        STACK_GROW_DIR_DETECTION;
 
-    size_t size = fiber_pool->size;
-    size_t stride = size + RB_PAGE_SIZE;
+        size_t size = fiber_pool->size;
+        size_t stride = size + RB_PAGE_SIZE;
 
-    // Allocate the memory required for the stacks:
-    void * base = fiber_pool_allocate_memory(&count, stride);
+        // Allocate the memory required for the stacks:
+        void * base = fiber_pool_allocate_memory(&count, stride);
 
-    if (base == NULL) {
-        rb_raise(rb_eFiberError, "can't alloc machine stack to fiber (%"PRIuSIZE" x %"PRIuSIZE" bytes): %s", count, size, ERRNOMSG);
-    }
+        if (base == NULL) {
+            rb_raise(rb_eFiberError, "can't alloc machine stack to fiber (%"PRIuSIZE" x %"PRIuSIZE" bytes): %s", count, size, ERRNOMSG);
+        }
 
-    struct fiber_pool_vacancy * vacancies = fiber_pool->vacancies;
-    struct fiber_pool_allocation * allocation = RB_ALLOC(struct fiber_pool_allocation);
+        struct fiber_pool_vacancy * vacancies = fiber_pool->vacancies;
+        allocation = RB_ALLOC(struct fiber_pool_allocation);
 
-    // Initialize fiber pool allocation:
-    allocation->base = base;
-    allocation->size = size;
-    allocation->stride = stride;
-    allocation->count = count;
+        // Initialize fiber pool allocation:
+        allocation->base = base;
+        allocation->size = size;
+        allocation->stride = stride;
+        allocation->count = count;
 #ifdef FIBER_POOL_ALLOCATION_FREE
-    allocation->used = 0;
+        allocation->used = 0;
 #endif
-    allocation->pool = fiber_pool;
+        allocation->pool = fiber_pool;
 
-    if (DEBUG) {
-        fprintf(stderr, "fiber_pool_expand(%"PRIuSIZE"): %p, %"PRIuSIZE"/%"PRIuSIZE" x [%"PRIuSIZE":%"PRIuSIZE"]\n",
-                count, (void*)fiber_pool, fiber_pool->used, fiber_pool->count, size, fiber_pool->vm_stack_size);
-    }
-
-    // Iterate over all stacks, initializing the vacancy list:
-    for (size_t i = 0; i < count; i += 1) {
-        void * base = (char*)allocation->base + (stride * i);
-        void * page = (char*)base + STACK_DIR_UPPER(size, 0);
+        if (DEBUG) {
+            fprintf(stderr, "fiber_pool_expand(%"PRIuSIZE"): %p, %"PRIuSIZE"/%"PRIuSIZE" x [%"PRIuSIZE":%"PRIuSIZE"]\n",
+                    count, (void*)fiber_pool, fiber_pool->used, fiber_pool->count, size, fiber_pool->vm_stack_size);
+        }
 
+        // Iterate over all stacks, initializing the vacancy list:
+        for (size_t i = 0; i < count; i += 1) {
+            void * base = (char*)allocation->base + (stride * i);
+            void * page = (char*)base + STACK_DIR_UPPER(size, 0);
 #if defined(_WIN32)
-        DWORD old_protect;
+            DWORD old_protect;
 
-        if (!VirtualProtect(page, RB_PAGE_SIZE, PAGE_READWRITE | PAGE_GUARD, &old_protect)) {
-            VirtualFree(allocation->base, 0, MEM_RELEASE);
-            rb_raise(rb_eFiberError, "can't set a guard page: %s", ERRNOMSG);
-        }
+            if (!VirtualProtect(page, RB_PAGE_SIZE, PAGE_READWRITE | PAGE_GUARD, &old_protect)) {
+                VirtualFree(allocation->base, 0, MEM_RELEASE);
+                rb_raise(rb_eFiberError, "can't set a guard page: %s", ERRNOMSG);
+            }
+#elif defined(__wasi__)
+            // wasi-libc's mprotect emulation doesn't support PROT_NONE.
+            (void)page;
 #else
-        if (mprotect(page, RB_PAGE_SIZE, PROT_NONE) < 0) {
-            munmap(allocation->base, count*stride);
-            rb_raise(rb_eFiberError, "can't set a guard page: %s", ERRNOMSG);
-        }
+            if (mprotect(page, RB_PAGE_SIZE, PROT_NONE) < 0) {
+                munmap(allocation->base, count*stride);
+                rb_raise(rb_eFiberError, "can't set a guard page: %s", ERRNOMSG);
+            }
 #endif
 
-        vacancies = fiber_pool_vacancy_initialize(
-            fiber_pool, vacancies,
-            (char*)base + STACK_DIR_UPPER(0, RB_PAGE_SIZE),
-            size
-        );
+            vacancies = fiber_pool_vacancy_initialize(
+                fiber_pool, vacancies,
+                (char*)base + STACK_DIR_UPPER(0, RB_PAGE_SIZE),
+                size
+            );
 
 #ifdef FIBER_POOL_ALLOCATION_FREE
-        vacancies->stack.allocation = allocation;
+            vacancies->stack.allocation = allocation;
 #endif
-    }
+        }
 
-    // Insert the allocation into the head of the pool:
-    allocation->next = fiber_pool->allocations;
+        // Insert the allocation into the head of the pool:
+        allocation->next = fiber_pool->allocations;
 
 #ifdef FIBER_POOL_ALLOCATION_FREE
-    if (allocation->next) {
-        allocation->next->previous = allocation;
-    }
+        if (allocation->next) {
+            allocation->next->previous = allocation;
+        }
 
-    allocation->previous = NULL;
+        allocation->previous = NULL;
 #endif
 
-    fiber_pool->allocations = allocation;
-    fiber_pool->vacancies = vacancies;
-    fiber_pool->count += count;
+        fiber_pool->allocations = allocation;
+        fiber_pool->vacancies = vacancies;
+        fiber_pool->count += count;
+    }
+    RB_VM_LOCK_LEAVE();
 
     return allocation;
 }
@@ -611,37 +665,46 @@ fiber_pool_allocation_free(struct fiber_pool_allocation * allocation)
 static struct fiber_pool_stack
 fiber_pool_stack_acquire(struct fiber_pool * fiber_pool)
 {
-    struct fiber_pool_vacancy * vacancy = fiber_pool_vacancy_pop(fiber_pool);
+    struct fiber_pool_vacancy * vacancy ;
+    RB_VM_LOCK_ENTER();
+    {
+        vacancy = fiber_pool_vacancy_pop(fiber_pool);
 
-    if (DEBUG) fprintf(stderr, "fiber_pool_stack_acquire: %p used=%"PRIuSIZE"\n", (void*)fiber_pool->vacancies, fiber_pool->used);
+        if (DEBUG) fprintf(stderr, "fiber_pool_stack_acquire: %p used=%"PRIuSIZE"\n", (void*)fiber_pool->vacancies, fiber_pool->used);
 
-    if (!vacancy) {
-        const size_t maximum = FIBER_POOL_ALLOCATION_MAXIMUM_SIZE;
-        const size_t minimum = fiber_pool->initial_count;
+        if (!vacancy) {
+            const size_t maximum = FIBER_POOL_ALLOCATION_MAXIMUM_SIZE;
+            const size_t minimum = fiber_pool->initial_count;
 
-        size_t count = fiber_pool->count;
-        if (count > maximum) count = maximum;
-        if (count < minimum) count = minimum;
+            size_t count = fiber_pool->count;
+            if (count > maximum) count = maximum;
+            if (count < minimum) count = minimum;
 
-        fiber_pool_expand(fiber_pool, count);
+            fiber_pool_expand(fiber_pool, count);
 
-        // The free list should now contain some stacks:
-        VM_ASSERT(fiber_pool->vacancies);
+            // The free list should now contain some stacks:
+            VM_ASSERT(fiber_pool->vacancies);
 
-        vacancy = fiber_pool_vacancy_pop(fiber_pool);
-    }
+            vacancy = fiber_pool_vacancy_pop(fiber_pool);
+        }
+
+        VM_ASSERT(vacancy);
+        VM_ASSERT(vacancy->stack.base);
 
-    VM_ASSERT(vacancy);
-    VM_ASSERT(vacancy->stack.base);
+#if defined(COROUTINE_SANITIZE_ADDRESS)
+        __asan_unpoison_memory_region(fiber_pool_stack_poison_base(&vacancy->stack), fiber_pool_stack_poison_size(&vacancy->stack));
+#endif
 
-    // Take the top item from the free list:
-    fiber_pool->used += 1;
+        // Take the top item from the free list:
+        fiber_pool->used += 1;
 
 #ifdef FIBER_POOL_ALLOCATION_FREE
-    vacancy->stack.allocation->used += 1;
+        vacancy->stack.allocation->used += 1;
 #endif
 
-    fiber_pool_stack_reset(&vacancy->stack);
+        fiber_pool_stack_reset(&vacancy->stack);
+    }
+    RB_VM_LOCK_LEAVE();
 
     return vacancy->stack;
 }
@@ -657,28 +720,54 @@ fiber_pool_stack_free(struct fiber_pool_stack * stack)
     // If this is not true, the vacancy information will almost certainly be destroyed:
     VM_ASSERT(size <= (stack->size - RB_PAGE_SIZE));
 
-    if (DEBUG) fprintf(stderr, "fiber_pool_stack_free: %p+%"PRIuSIZE" [base=%p, size=%"PRIuSIZE"]\n", base, size, stack->base, stack->size);
+    int advice = stack->pool->free_stacks >> 1;
+
+    if (DEBUG) fprintf(stderr, "fiber_pool_stack_free: %p+%"PRIuSIZE" [base=%p, size=%"PRIuSIZE"] advice=%d\n", base, size, stack->base, stack->size, advice);
 
-#if VM_CHECK_MODE > 0 && defined(MADV_DONTNEED)
+    // The pages being used by the stack can be returned back to the system.
+    // That doesn't change the page mapping, but it does allow the system to
+    // reclaim the physical memory.
+    // Since we no longer care about the data itself, we don't need to page
+    // out to disk, since that is costly. Not all systems support that, so
+    // we try our best to select the most efficient implementation.
+    // In addition, it's actually slightly desirable to not do anything here,
+    // but that results in higher memory usage.
+
+#ifdef __wasi__
+    // WebAssembly doesn't support madvise, so we just don't do anything.
+#elif VM_CHECK_MODE > 0 && defined(MADV_DONTNEED)
+    if (!advice) advice = MADV_DONTNEED;
     // This immediately discards the pages and the memory is reset to zero.
-    madvise(base, size, MADV_DONTNEED);
-#elif defined(POSIX_MADV_DONTNEED)
-    posix_madvise(base, size, POSIX_MADV_DONTNEED);
+    madvise(base, size, advice);
 #elif defined(MADV_FREE_REUSABLE)
+    if (!advice) advice = MADV_FREE_REUSABLE;
+    // Darwin / macOS / iOS.
     // Acknowledge the kernel down to the task info api we make this
     // page reusable for future use.
-    // As for MADV_FREE_REUSE below we ensure in the rare occasions the task was not
+    // As for MADV_FREE_REUSABLE below we ensure in the rare occasions the task was not
     // completed at the time of the call to re-iterate.
-    while (madvise(base, size, MADV_FREE_REUSABLE) == -1 && errno == EAGAIN);
+    while (madvise(base, size, advice) == -1 && errno == EAGAIN);
 #elif defined(MADV_FREE)
-    madvise(base, size, MADV_FREE);
+    if (!advice) advice = MADV_FREE;
+    // Recent Linux.
+    madvise(base, size, advice);
 #elif defined(MADV_DONTNEED)
-    madvise(base, size, MADV_DONTNEED);
+    if (!advice) advice = MADV_DONTNEED;
+    // Old Linux.
+    madvise(base, size, advice);
+#elif defined(POSIX_MADV_DONTNEED)
+    if (!advice) advice = POSIX_MADV_DONTNEED;
+    // Solaris?
+    posix_madvise(base, size, advice);
 #elif defined(_WIN32)
     VirtualAlloc(base, size, MEM_RESET, PAGE_READWRITE);
     // Not available in all versions of Windows.
     //DiscardVirtualMemory(base, size);
 #endif
+
+#if defined(COROUTINE_SANITIZE_ADDRESS)
+    __asan_poison_memory_region(fiber_pool_stack_poison_base(stack), fiber_pool_stack_poison_size(stack));
+#endif
 }
 
 // Release and return a stack to the vacancy list.
@@ -698,7 +787,7 @@ fiber_pool_stack_release(struct fiber_pool_stack * stack)
     fiber_pool_vacancy_reset(vacancy);
 
     // Push the vacancy into the vancancies list:
-    pool->vacancies = fiber_pool_vacancy_push(vacancy, stack->pool->vacancies);
+    pool->vacancies = fiber_pool_vacancy_push(vacancy, pool->vacancies);
     pool->used -= 1;
 
 #ifdef FIBER_POOL_ALLOCATION_FREE
@@ -714,7 +803,8 @@ fiber_pool_stack_release(struct fiber_pool_stack * stack)
         fiber_pool_stack_free(&vacancy->stack);
     }
 #else
-    // This is entirely optional, but clears the dirty flag from the stack memory, so it won't get swapped to disk when there is memory pressure:
+    // This is entirely optional, but clears the dirty flag from the stack
+    // memory, so it won't get swapped to disk when there is memory pressure:
     if (stack->pool->free_stacks) {
         fiber_pool_stack_free(&vacancy->stack);
     }
@@ -725,6 +815,9 @@ static inline void
 ec_switch(rb_thread_t *th, rb_fiber_t *fiber)
 {
     rb_execution_context_t *ec = &fiber->cont.saved_ec;
+#ifdef RUBY_ASAN_ENABLED
+    ec->machine.asan_fake_stack_handle = asan_get_thread_fake_stack_handle();
+#endif
     rb_ractor_set_current_ec(th->ractor, th->ec = ec);
     // ruby_current_execution_context_ptr = th->ec = ec;
 
@@ -747,10 +840,28 @@ fiber_restore_thread(rb_thread_t *th, rb_fiber_t *fiber)
     VM_ASSERT(th->ec->fiber_ptr == fiber);
 }
 
+#ifndef COROUTINE_DECL
+# define COROUTINE_DECL COROUTINE
+#endif
+NORETURN(static COROUTINE_DECL fiber_entry(struct coroutine_context * from, struct coroutine_context * to));
 static COROUTINE
 fiber_entry(struct coroutine_context * from, struct coroutine_context * to)
 {
     rb_fiber_t *fiber = to->argument;
+
+#if defined(COROUTINE_SANITIZE_ADDRESS)
+    // Address sanitizer will copy the previous stack base and stack size into
+    // the "from" fiber. `coroutine_initialize_main` doesn't generally know the
+    // stack bounds (base + size). Therefore, the main fiber `stack_base` and
+    // `stack_size` will be NULL/0. It's specifically important in that case to
+    // get the (base+size) of the previous fiber and save it, so that later when
+    // we return to the main coroutine, we don't supply (NULL, 0) to
+    // __sanitizer_start_switch_fiber which royally messes up the internal state
+    // of ASAN and causes (sometimes) the following message:
+    // "WARNING: ASan is ignoring requested __asan_handle_no_return"
+    __sanitizer_finish_switch_fiber(to->fake_stack, (const void**)&from->stack_base, &from->stack_size);
+#endif
+
     rb_thread_t *thread = fiber->cont.saved_ec.thread_ptr;
 
 #ifdef COROUTINE_PTHREAD_CONTEXT
@@ -791,7 +902,8 @@ fiber_initialize_coroutine(rb_fiber_t *fiber, size_t * vm_stack_size)
     return vm_stack;
 }
 
-// Release the stack from the fiber, it's execution context, and return it to the fiber pool.
+// Release the stack from the fiber, it's execution context, and return it to
+// the fiber pool.
 static void
 fiber_stack_release(rb_fiber_t * fiber)
 {
@@ -809,6 +921,17 @@ fiber_stack_release(rb_fiber_t * fiber)
     rb_ec_clear_vm_stack(ec);
 }
 
+static void
+fiber_stack_release_locked(rb_fiber_t *fiber)
+{
+    if (!ruby_vm_during_cleanup) {
+        // We can't try to acquire the VM lock here because MMTK calls free in its own native thread which has no ec.
+        // This assertion will fail on MMTK but we currently don't have CI for debug releases of MMTK, so we can assert for now.
+        ASSERT_vm_locking_with_barrier();
+    }
+    fiber_stack_release(fiber);
+}
+
 static const char *
 fiber_status_name(enum fiber_status s)
 {
@@ -830,7 +953,9 @@ fiber_verify(const rb_fiber_t *fiber)
 
     switch (fiber->status) {
       case FIBER_RESUMED:
-        VM_ASSERT(fiber->cont.saved_ec.vm_stack != NULL);
+        if (fiber->cont.saved_ec.thread_ptr->self == 0) {
+            VM_ASSERT(fiber->cont.saved_ec.vm_stack != NULL);
+        }
         break;
       case FIBER_SUSPENDED:
         VM_ASSERT(fiber->cont.saved_ec.vm_stack != NULL);
@@ -860,7 +985,7 @@ cont_ptr(VALUE obj)
 {
     rb_context_t *cont;
 
-    TypedData_Get_Struct(obj, rb_context_t, &cont_data_type, cont);
+    TypedData_Get_Struct(obj, rb_context_t, &rb_cont_data_type, cont);
 
     return cont;
 }
@@ -870,7 +995,7 @@ fiber_ptr(VALUE obj)
 {
     rb_fiber_t *fiber;
 
-    TypedData_Get_Struct(obj, rb_fiber_t, &fiber_data_type, fiber);
+    TypedData_Get_Struct(obj, rb_fiber_t, &rb_fiber_data_type, fiber);
     if (!fiber) rb_raise(rb_eFiberError, "uninitialized fiber");
 
     return fiber;
@@ -937,13 +1062,8 @@ cont_mark(void *ptr)
                                  cont->machine.stack + cont->machine.stack_size);
         }
         else {
-            /* fiber */
-            const rb_fiber_t *fiber = (rb_fiber_t*)cont;
-
-            if (!FIBER_TERMINATED_P(fiber)) {
-                rb_gc_mark_locations(cont->machine.stack,
-                                     cont->machine.stack + cont->machine.stack_size);
-            }
+            /* fiber machine context is marked as part of rb_execution_context_mark, no need to
+             * do anything here. */
         }
     }
 
@@ -958,6 +1078,8 @@ fiber_is_root_p(const rb_fiber_t *fiber)
 }
 #endif
 
+static void jit_cont_free(struct rb_jit_cont *cont);
+
 static void
 cont_free(void *ptr)
 {
@@ -967,21 +1089,18 @@ cont_free(void *ptr)
 
     if (cont->type == CONTINUATION_CONTEXT) {
         ruby_xfree(cont->saved_ec.vm_stack);
-        ruby_xfree(cont->ensure_array);
         RUBY_FREE_UNLESS_NULL(cont->machine.stack);
     }
     else {
         rb_fiber_t *fiber = (rb_fiber_t*)cont;
         coroutine_destroy(&fiber->context);
-        fiber_stack_release(fiber);
+        fiber_stack_release_locked(fiber);
     }
 
     RUBY_FREE_UNLESS_NULL(cont->saved_vm_stack.ptr);
 
-    if (mjit_enabled) {
-        VM_ASSERT(cont->mjit_cont != NULL);
-        mjit_cont_free(cont->mjit_cont);
-    }
+    VM_ASSERT(cont->jit_cont != NULL);
+    jit_cont_free(cont->jit_cont);
     /* free rb_cont_t or rb_fiber_t */
     ruby_xfree(ptr);
     RUBY_FREE_LEAVE("cont");
@@ -1024,12 +1143,7 @@ rb_fiber_update_self(rb_fiber_t *fiber)
 void
 rb_fiber_mark_self(const rb_fiber_t *fiber)
 {
-    if (fiber->cont.self) {
-        rb_gc_mark_movable(fiber->cont.self);
-    }
-    else {
-        rb_execution_context_mark(&fiber->cont.saved_ec);
-    }
+    rb_gc_mark_movable(fiber->cont.self);
 }
 
 static void
@@ -1085,7 +1199,9 @@ fiber_memsize(const void *ptr)
      */
     if (saved_ec->local_storage && fiber != th->root_fiber) {
         size += rb_id_table_memsize(saved_ec->local_storage);
+        size += rb_obj_memsize_of(saved_ec->storage);
     }
+
     size += cont_memsize(&fiber->cont);
     return size;
 }
@@ -1093,7 +1209,7 @@ fiber_memsize(const void *ptr)
 VALUE
 rb_obj_is_fiber(VALUE obj)
 {
-    return RBOOL(rb_typeddata_is_kind_of(obj, &fiber_data_type));
+    return RBOOL(rb_typeddata_is_kind_of(obj, &rb_fiber_data_type));
 }
 
 static void
@@ -1120,12 +1236,27 @@ cont_save_machine_stack(rb_thread_t *th, rb_context_t *cont)
     }
 
     FLUSH_REGISTER_WINDOWS;
+    asan_unpoison_memory_region(cont->machine.stack_src, size, false);
     MEMCPY(cont->machine.stack, cont->machine.stack_src, VALUE, size);
 }
 
-static const rb_data_type_t cont_data_type = {
+static void
+cont_handle_weak_references(void *ptr)
+{
+    rb_context_t *cont = ptr;
+
+    if (!cont) return;
+
+    if (!rb_gc_handle_weak_references_alive_p(cont->saved_ec.gen_fields_cache.obj) ||
+            !rb_gc_handle_weak_references_alive_p(cont->saved_ec.gen_fields_cache.fields_obj)) {
+        cont->saved_ec.gen_fields_cache.obj = Qundef;
+        cont->saved_ec.gen_fields_cache.fields_obj = Qundef;
+    }
+}
+
+static const rb_data_type_t rb_cont_data_type = {
     "continuation",
-    {cont_mark, cont_free, cont_memsize, cont_compact},
+    {cont_mark, cont_free, cont_memsize, cont_compact, cont_handle_weak_references},
     0, 0, RUBY_TYPED_FREE_IMMEDIATELY
 };
 
@@ -1144,13 +1275,125 @@ cont_save_thread(rb_context_t *cont, rb_thread_t *th)
     sec->machine.stack_end = NULL;
 }
 
+static rb_nativethread_lock_t jit_cont_lock;
+
+// Register a new continuation with execution context `ec`. Return JIT info about
+// the continuation.
+static struct rb_jit_cont *
+jit_cont_new(rb_execution_context_t *ec)
+{
+    struct rb_jit_cont *cont;
+
+    // We need to use calloc instead of something like ZALLOC to avoid triggering GC here.
+    // When this function is called from rb_thread_alloc through rb_threadptr_root_fiber_setup,
+    // the thread is still being prepared and marking it causes SEGV.
+    cont = calloc(1, sizeof(struct rb_jit_cont));
+    if (cont == NULL)
+        rb_memerror();
+    cont->ec = ec;
+
+    rb_native_mutex_lock(&jit_cont_lock);
+    if (first_jit_cont == NULL) {
+        cont->next = cont->prev = NULL;
+    }
+    else {
+        cont->prev = NULL;
+        cont->next = first_jit_cont;
+        first_jit_cont->prev = cont;
+    }
+    first_jit_cont = cont;
+    rb_native_mutex_unlock(&jit_cont_lock);
+
+    return cont;
+}
+
+// Unregister continuation `cont`.
 static void
-cont_init_mjit_cont(rb_context_t *cont)
+jit_cont_free(struct rb_jit_cont *cont)
+{
+    if (!cont) return;
+
+    rb_native_mutex_lock(&jit_cont_lock);
+    if (cont == first_jit_cont) {
+        first_jit_cont = cont->next;
+        if (first_jit_cont != NULL)
+            first_jit_cont->prev = NULL;
+    }
+    else {
+        cont->prev->next = cont->next;
+        if (cont->next != NULL)
+            cont->next->prev = cont->prev;
+    }
+    rb_native_mutex_unlock(&jit_cont_lock);
+
+    free(cont);
+}
+
+// Call a given callback against all on-stack ISEQs.
+void
+rb_jit_cont_each_iseq(rb_iseq_callback callback, void *data)
+{
+    struct rb_jit_cont *cont;
+    for (cont = first_jit_cont; cont != NULL; cont = cont->next) {
+        if (cont->ec->vm_stack == NULL)
+            continue;
+
+        const rb_control_frame_t *cfp = cont->ec->cfp;
+        while (!RUBY_VM_CONTROL_FRAME_STACK_OVERFLOW_P(cont->ec, cfp)) {
+            if (cfp->pc && cfp->iseq && imemo_type((VALUE)cfp->iseq) == imemo_iseq) {
+                callback(cfp->iseq, data);
+            }
+            cfp = RUBY_VM_PREVIOUS_CONTROL_FRAME(cfp);
+        }
+    }
+}
+
+#if USE_YJIT
+// Update the jit_return of all CFPs to leave_exit unless it's leave_exception or not set.
+// This prevents jit_exec_exception from jumping to the caller after invalidation.
+void
+rb_yjit_cancel_jit_return(void *leave_exit, void *leave_exception)
+{
+    struct rb_jit_cont *cont;
+    for (cont = first_jit_cont; cont != NULL; cont = cont->next) {
+        if (cont->ec->vm_stack == NULL)
+            continue;
+
+        const rb_control_frame_t *cfp = cont->ec->cfp;
+        while (!RUBY_VM_CONTROL_FRAME_STACK_OVERFLOW_P(cont->ec, cfp)) {
+            if (cfp->jit_return && cfp->jit_return != leave_exception) {
+                ((rb_control_frame_t *)cfp)->jit_return = leave_exit;
+            }
+            cfp = RUBY_VM_PREVIOUS_CONTROL_FRAME(cfp);
+        }
+    }
+}
+#endif
+
+// Finish working with jit_cont.
+void
+rb_jit_cont_finish(void)
 {
-    VM_ASSERT(cont->mjit_cont == NULL);
-    if (mjit_enabled) {
-        cont->mjit_cont = mjit_cont_new(&(cont->saved_ec));
+    struct rb_jit_cont *cont, *next;
+    for (cont = first_jit_cont; cont != NULL; cont = next) {
+        next = cont->next;
+        free(cont); // Don't use xfree because it's allocated by calloc.
     }
+    rb_native_mutex_destroy(&jit_cont_lock);
+}
+
+static void
+cont_init_jit_cont(rb_context_t *cont)
+{
+    VM_ASSERT(cont->jit_cont == NULL);
+    // We always allocate this since YJIT may be enabled later
+    cont->jit_cont = jit_cont_new(&(cont->saved_ec));
+}
+
+struct rb_execution_context_struct *
+rb_fiberptr_get_ec(struct rb_fiber_struct *fiber)
+{
+    return &fiber->cont.saved_ec;
 }
 
 static void
@@ -1162,7 +1405,7 @@ cont_init(rb_context_t *cont, rb_thread_t *th)
     cont->saved_ec.local_storage = NULL;
     cont->saved_ec.local_storage_recursive_hash = Qnil;
     cont->saved_ec.local_storage_recursive_hash_for_trace = Qnil;
-    cont_init_mjit_cont(cont);
+    cont_init_jit_cont(cont);
 }
 
 static rb_context_t *
@@ -1173,7 +1416,8 @@ cont_new(VALUE klass)
     rb_thread_t *th = GET_THREAD();
 
     THREAD_MUST_BE_RUNNING(th);
-    contval = TypedData_Make_Struct(klass, rb_context_t, &cont_data_type, cont);
+    contval = TypedData_Make_Struct(klass, rb_context_t, &rb_cont_data_type, cont);
+    rb_gc_declare_weak_references(contval);
     cont->self = contval;
     cont_init(cont, th);
     return cont;
@@ -1191,11 +1435,11 @@ rb_fiberptr_blocking(struct rb_fiber_struct *fiber)
     return fiber->blocking;
 }
 
-// This is used for root_fiber because other fibers call cont_init_mjit_cont through cont_new.
+// Initialize the jit_cont_lock
 void
-rb_fiber_init_mjit_cont(struct rb_fiber_struct *fiber)
+rb_jit_cont_init(void)
 {
-    cont_init_mjit_cont(&fiber->cont);
+    rb_native_mutex_initialize(&jit_cont_lock);
 }
 
 #if 0
@@ -1225,10 +1469,7 @@ show_vm_pcs(const rb_control_frame_t *cfp,
     }
 }
 #endif
-COMPILER_WARNING_PUSH
-#ifdef __clang__
-COMPILER_WARNING_IGNORED(-Wduplicate-decl-specifier)
-#endif
+
 static VALUE
 cont_capture(volatile int *volatile stat)
 {
@@ -1262,22 +1503,6 @@ cont_capture(volatile int *volatile stat)
     VM_ASSERT(cont->saved_ec.cfp != NULL);
     cont_save_machine_stack(th, cont);
 
-    /* backup ensure_list to array for search in another context */
-    {
-        rb_ensure_list_t *p;
-        int size = 0;
-        rb_ensure_entry_t *entry;
-        for (p=th->ec->ensure_list; p; p=p->next)
-            size++;
-        entry = cont->ensure_array = ALLOC_N(rb_ensure_entry_t,size+1);
-        for (p=th->ec->ensure_list; p; p=p->next) {
-            if (!p->entry.marker)
-                p->entry.marker = rb_ary_tmp_new(0); /* dummy object */
-            *entry++ = p->entry;
-        }
-        entry->marker = 0;
-    }
-
     if (ruby_setjmp(cont->jmpbuf)) {
         VALUE value;
 
@@ -1293,7 +1518,6 @@ cont_capture(volatile int *volatile stat)
         return contval;
     }
 }
-COMPILER_WARNING_POP
 
 static inline void
 cont_restore_thread(rb_context_t *cont)
@@ -1321,6 +1545,51 @@ cont_restore_thread(rb_context_t *cont)
             rb_raise(rb_eRuntimeError, "can't call across trace_func");
         }
 
+#if defined(__wasm__) && !defined(__EMSCRIPTEN__)
+        if (th->ec->tag != sec->tag) {
+            /* find the lowest common ancestor tag of the current EC and the saved EC */
+
+            struct rb_vm_tag *lowest_common_ancestor = NULL;
+            size_t num_tags = 0;
+            size_t num_saved_tags = 0;
+            for (struct rb_vm_tag *tag = th->ec->tag; tag != NULL; tag = tag->prev) {
+                ++num_tags;
+            }
+            for (struct rb_vm_tag *tag = sec->tag; tag != NULL; tag = tag->prev) {
+                ++num_saved_tags;
+            }
+
+            size_t min_tags = num_tags <= num_saved_tags ? num_tags : num_saved_tags;
+
+            struct rb_vm_tag *tag = th->ec->tag;
+            while (num_tags > min_tags) {
+                tag = tag->prev;
+                --num_tags;
+            }
+
+            struct rb_vm_tag *saved_tag = sec->tag;
+            while (num_saved_tags > min_tags) {
+                saved_tag = saved_tag->prev;
+                --num_saved_tags;
+            }
+
+            while (min_tags > 0) {
+                if (tag == saved_tag) {
+                    lowest_common_ancestor = tag;
+                    break;
+                }
+                tag = tag->prev;
+                saved_tag = saved_tag->prev;
+                --min_tags;
+            }
+
+            /* free all the jump buffers between the current EC's tag and the lowest common ancestor tag */
+            for (struct rb_vm_tag *tag = th->ec->tag; tag != lowest_common_ancestor; tag = tag->prev) {
+                rb_vm_tag_jmpbuf_deinit(&tag->buf);
+            }
+        }
+#endif
+
         /* copy vm stack */
 #ifdef CAPTURE_JUST_VALID_VM_STACK
         MEMCPY(th->ec->vm_stack,
@@ -1339,7 +1608,6 @@ cont_restore_thread(rb_context_t *cont)
         th->ec->tag = sec->tag;
         th->ec->root_lep = sec->root_lep;
         th->ec->root_svar = sec->root_svar;
-        th->ec->ensure_list = sec->ensure_list;
         th->ec->errinfo = sec->errinfo;
 
         VM_ASSERT(th->ec->vm_stack != NULL);
@@ -1371,17 +1639,24 @@ fiber_setcontext(rb_fiber_t *new_fiber, rb_fiber_t *old_fiber)
         }
     }
 
-    /* exchange machine_stack_start between old_fiber and new_fiber */
+    /* these values are used in rb_gc_mark_machine_context to mark the fiber's stack. */
     old_fiber->cont.saved_ec.machine.stack_start = th->ec->machine.stack_start;
+    old_fiber->cont.saved_ec.machine.stack_end = FIBER_TERMINATED_P(old_fiber) ? NULL : th->ec->machine.stack_end;
 
-    /* old_fiber->machine.stack_end should be NULL */
-    old_fiber->cont.saved_ec.machine.stack_end = NULL;
 
     // if (DEBUG) fprintf(stderr, "fiber_setcontext: %p[%p] -> %p[%p]\n", (void*)old_fiber, old_fiber->stack.base, (void*)new_fiber, new_fiber->stack.base);
 
+#if defined(COROUTINE_SANITIZE_ADDRESS)
+    __sanitizer_start_switch_fiber(FIBER_TERMINATED_P(old_fiber) ? NULL : &old_fiber->context.fake_stack, new_fiber->context.stack_base, new_fiber->context.stack_size);
+#endif
+
     /* swap machine context */
     struct coroutine_context * from = coroutine_transfer(&old_fiber->context, &new_fiber->context);
 
+#if defined(COROUTINE_SANITIZE_ADDRESS)
+    __sanitizer_finish_switch_fiber(old_fiber->context.fake_stack, NULL, NULL);
+#endif
+
     if (from == NULL) {
         rb_syserr_fail(errno, "coroutine_transfer");
     }
@@ -1401,9 +1676,9 @@ cont_restore_1(rb_context_t *cont)
     cont_restore_thread(cont);
 
     /* restore machine stack */
-#ifdef _M_AMD64
+#if (defined(_M_AMD64) && !defined(__MINGW64__)) || defined(_M_ARM64)
     {
-        /* workaround for x64 SEH */
+        /* workaround for x64 and arm64 SEH on Windows */
         jmp_buf buf;
         setjmp(buf);
         _JUMP_BUFFER *bp = (void*)&cont->jmpbuf;
@@ -1441,6 +1716,10 @@ cont_restore_0(rb_context_t *cont, VALUE *addr_in_prev_frame)
             if (&space[0] > end) {
 # ifdef HAVE_ALLOCA
                 volatile VALUE *sp = ALLOCA_N(VALUE, &space[0] - end);
+                // We need to make sure that the stack pointer is moved,
+                // but some compilers may remove the allocation by optimization.
+                // We hope that the following read/write will prevent such an optimization.
+                *sp = Qfalse;
                 space[0] = *sp;
 # else
                 cont_restore_0(cont, &space[0]);
@@ -1566,6 +1845,13 @@ rb_callcc(VALUE self)
         return rb_yield(val);
     }
 }
+#ifdef RUBY_ASAN_ENABLED
+/* callcc can't possibly work with ASAN; see bug #20273. Also this function
+ * definition below avoids a "defined and not used" warning. */
+MAYBE_UNUSED(static void notusing_callcc(void)) { rb_callcc(Qnil); }
+# define rb_callcc rb_f_notimplement
+#endif
+
 
 static VALUE
 make_passing_arg(int argc, const VALUE *argv)
@@ -1584,80 +1870,6 @@ make_passing_arg(int argc, const VALUE *argv)
 
 typedef VALUE e_proc(VALUE);
 
-/* CAUTION!! : Currently, error in rollback_func is not supported  */
-/* same as rb_protect if set rollback_func to NULL */
-void
-ruby_register_rollback_func_for_ensure(e_proc *ensure_func, e_proc *rollback_func)
-{
-    st_table **table_p = &GET_VM()->ensure_rollback_table;
-    if (UNLIKELY(*table_p == NULL)) {
-        *table_p = st_init_numtable();
-    }
-    st_insert(*table_p, (st_data_t)ensure_func, (st_data_t)rollback_func);
-}
-
-static inline e_proc *
-lookup_rollback_func(e_proc *ensure_func)
-{
-    st_table *table = GET_VM()->ensure_rollback_table;
-    st_data_t val;
-    if (table && st_lookup(table, (st_data_t)ensure_func, &val))
-        return (e_proc *) val;
-    return (e_proc *) Qundef;
-}
-
-
-static inline void
-rollback_ensure_stack(VALUE self,rb_ensure_list_t *current,rb_ensure_entry_t *target)
-{
-    rb_ensure_list_t *p;
-    rb_ensure_entry_t *entry;
-    size_t i, j;
-    size_t cur_size;
-    size_t target_size;
-    size_t base_point;
-    e_proc *func;
-
-    cur_size = 0;
-    for (p=current; p; p=p->next)
-        cur_size++;
-    target_size = 0;
-    for (entry=target; entry->marker; entry++)
-        target_size++;
-
-    /* search common stack point */
-    p = current;
-    base_point = cur_size;
-    while (base_point) {
-        if (target_size >= base_point &&
-            p->entry.marker == target[target_size - base_point].marker)
-            break;
-        base_point --;
-        p = p->next;
-    }
-
-    /* rollback function check */
-    for (i=0; i < target_size - base_point; i++) {
-        if (!lookup_rollback_func(target[i].e_proc)) {
-            rb_raise(rb_eRuntimeError, "continuation called from out of critical rb_ensure scope");
-        }
-    }
-    /* pop ensure stack */
-    while (cur_size > base_point) {
-        /* escape from ensure block */
-        (*current->entry.e_proc)(current->entry.data2);
-        current = current->next;
-        cur_size--;
-    }
-    /* push ensure stack */
-    for (j = 0; j < i; j++) {
-        func = lookup_rollback_func(target[i - j - 1].e_proc);
-        if ((VALUE)func != Qundef) {
-            (*func)(target[i - j - 1].data2);
-        }
-    }
-}
-
 NORETURN(static VALUE rb_cont_call(int argc, VALUE *argv, VALUE contval));
 
 /*
@@ -1689,7 +1901,6 @@ rb_cont_call(int argc, VALUE *argv, VALUE contval)
             rb_raise(rb_eRuntimeError, "continuation called across fiber");
         }
     }
-    rollback_ensure_stack(contval, th->ec->ensure_list, cont->ensure_array);
 
     cont->argc = argc;
     cont->value = make_passing_arg(argc, argv);
@@ -1766,7 +1977,7 @@ rb_cont_call(int argc, VALUE *argv, VALUE contval)
  *  == Non-blocking Fibers
  *
  *  The concept of <em>non-blocking fiber</em> was introduced in Ruby 3.0.
- *  A non-blocking fiber, when reaching a operation that would normally block
+ *  A non-blocking fiber, when reaching an operation that would normally block
  *  the fiber (like <code>sleep</code>, or wait for another process or I/O)
  *  will yield control to other fibers and allow the <em>scheduler</em> to
  *  handle blocking and waking up (resuming) this fiber when it can proceed.
@@ -1777,7 +1988,7 @@ rb_cont_call(int argc, VALUE *argv, VALUE contval)
  *  the current thread, blocking and non-blocking fibers' behavior is identical.
  *
  *  Ruby doesn't provide a scheduler class: it is expected to be implemented by
- *  the user and correspond to Fiber::SchedulerInterface.
+ *  the user and correspond to Fiber::Scheduler.
  *
  *  There is also Fiber.schedule method, which is expected to immediately perform
  *  the given block in a non-blocking manner. Its actual implementation is up to
@@ -1785,16 +1996,38 @@ rb_cont_call(int argc, VALUE *argv, VALUE contval)
  *
  */
 
-static const rb_data_type_t fiber_data_type = {
+static void
+fiber_handle_weak_references(void *ptr)
+{
+    rb_fiber_t *fiber = ptr;
+
+    if (!fiber) return;
+
+    if (!rb_gc_handle_weak_references_alive_p(fiber->cont.saved_ec.gen_fields_cache.obj) ||
+            !rb_gc_handle_weak_references_alive_p(fiber->cont.saved_ec.gen_fields_cache.fields_obj)) {
+        fiber->cont.saved_ec.gen_fields_cache.obj = Qundef;
+        fiber->cont.saved_ec.gen_fields_cache.fields_obj = Qundef;
+    }
+}
+
+static const rb_data_type_t rb_fiber_data_type = {
     "fiber",
-    {fiber_mark, fiber_free, fiber_memsize, fiber_compact,},
+    {fiber_mark, fiber_free, fiber_memsize, fiber_compact, fiber_handle_weak_references},
     0, 0, RUBY_TYPED_FREE_IMMEDIATELY
 };
 
 static VALUE
 fiber_alloc(VALUE klass)
 {
-    return TypedData_Wrap_Struct(klass, &fiber_data_type, 0);
+    VALUE obj = TypedData_Wrap_Struct(klass, &rb_fiber_data_type, 0);
+    rb_gc_declare_weak_references(obj);
+    return obj;
+}
+
+static rb_serial_t
+next_ec_serial(rb_ractor_t *cr)
+{
+    return cr->next_ec_serial++;
 }
 
 static rb_fiber_t*
@@ -1812,9 +2045,11 @@ fiber_t_alloc(VALUE fiber_value, unsigned int blocking)
     fiber->cont.self = fiber_value;
     fiber->cont.type = FIBER_CONTEXT;
     fiber->blocking = blocking;
+    fiber->killed = 0;
     cont_init(&fiber->cont, th);
 
     fiber->cont.saved_ec.fiber_ptr = fiber;
+    fiber->cont.saved_ec.serial = next_ec_serial(th->ractor);
     rb_ec_clear_vm_stack(&fiber->cont.saved_ec);
 
     fiber->prev = NULL;
@@ -1828,11 +2063,198 @@ fiber_t_alloc(VALUE fiber_value, unsigned int blocking)
     return fiber;
 }
 
+static inline rb_fiber_t*
+fiber_current(void)
+{
+    rb_execution_context_t *ec = GET_EC();
+    return ec->fiber_ptr;
+}
+
+static inline VALUE
+current_fiber_storage(void)
+{
+    rb_execution_context_t *ec = GET_EC();
+    return ec->storage;
+}
+
+static inline VALUE
+inherit_fiber_storage(void)
+{
+    return rb_obj_dup(current_fiber_storage());
+}
+
+static inline void
+fiber_storage_set(struct rb_fiber_struct *fiber, VALUE storage)
+{
+    fiber->cont.saved_ec.storage = storage;
+}
+
+static inline VALUE
+fiber_storage_get(rb_fiber_t *fiber, int allocate)
+{
+    VALUE storage = fiber->cont.saved_ec.storage;
+    if (storage == Qnil && allocate) {
+        storage = rb_hash_new();
+        fiber_storage_set(fiber, storage);
+    }
+    return storage;
+}
+
+static void
+storage_access_must_be_from_same_fiber(VALUE self)
+{
+    rb_fiber_t *fiber = fiber_ptr(self);
+    rb_fiber_t *current = fiber_current();
+    if (fiber != current) {
+        rb_raise(rb_eArgError, "Fiber storage can only be accessed from the Fiber it belongs to");
+    }
+}
+
+/**
+ *  call-seq: fiber.storage -> hash (dup)
+ *
+ *  Returns a copy of the storage hash for the fiber. The method can only be called on the
+ *  Fiber.current.
+ */
+static VALUE
+rb_fiber_storage_get(VALUE self)
+{
+    storage_access_must_be_from_same_fiber(self);
+
+    VALUE storage = fiber_storage_get(fiber_ptr(self), FALSE);
+
+    if (storage == Qnil) {
+        return Qnil;
+    }
+    else {
+        return rb_obj_dup(storage);
+    }
+}
+
+static int
+fiber_storage_validate_each(VALUE key, VALUE value, VALUE _argument)
+{
+    Check_Type(key, T_SYMBOL);
+
+    return ST_CONTINUE;
+}
+
+static void
+fiber_storage_validate(VALUE value)
+{
+    // nil is an allowed value and will be lazily initialized.
+    if (value == Qnil) return;
+
+    if (!RB_TYPE_P(value, T_HASH)) {
+        rb_raise(rb_eTypeError, "storage must be a hash");
+    }
+
+    if (RB_OBJ_FROZEN(value)) {
+        rb_raise(rb_eFrozenError, "storage must not be frozen");
+    }
+
+    rb_hash_foreach(value, fiber_storage_validate_each, Qundef);
+}
+
+/**
+ *  call-seq: fiber.storage = hash
+ *
+ *  Sets the storage hash for the fiber. This feature is experimental
+ *  and may change in the future. The method can only be called on the
+ *  Fiber.current.
+ *
+ *  You should be careful about using this method as you may inadvertently clear
+ *  important fiber-storage state. You should mostly prefer to assign specific
+ *  keys in the storage using Fiber::[]=.
+ *
+ *  You can also use <tt>Fiber.new(storage: nil)</tt> to create a fiber with an empty
+ *  storage.
+ *
+ *  Example:
+ *
+ *    while request = request_queue.pop
+ *      # Reset the per-request state:
+ *      Fiber.current.storage = nil
+ *      handle_request(request)
+ *    end
+ */
+static VALUE
+rb_fiber_storage_set(VALUE self, VALUE value)
+{
+    if (rb_warning_category_enabled_p(RB_WARN_CATEGORY_EXPERIMENTAL)) {
+        rb_category_warn(RB_WARN_CATEGORY_EXPERIMENTAL,
+          "Fiber#storage= is experimental and may be removed in the future!");
+    }
+
+    storage_access_must_be_from_same_fiber(self);
+    fiber_storage_validate(value);
+
+    fiber_ptr(self)->cont.saved_ec.storage = rb_obj_dup(value);
+    return value;
+}
+
+/**
+ *  call-seq: Fiber[key] -> value
+ *
+ *  Returns the value of the fiber storage variable identified by +key+.
+ *
+ *  The +key+ must be a symbol, and the value is set by Fiber#[]= or
+ *  Fiber#storage.
+ *
+ *  See also Fiber::[]=.
+ */
+static VALUE
+rb_fiber_storage_aref(VALUE class, VALUE key)
+{
+    key = rb_to_symbol(key);
+
+    VALUE storage = fiber_storage_get(fiber_current(), FALSE);
+    if (storage == Qnil) return Qnil;
+
+    return rb_hash_aref(storage, key);
+}
+
+/**
+ *  call-seq: Fiber[key] = value
+ *
+ *  Assign +value+ to the fiber storage variable identified by +key+.
+ *  The variable is created if it doesn't exist.
+ *
+ *  +key+ must be a Symbol, otherwise a TypeError is raised.
+ *
+ *  See also Fiber::[].
+ */
 static VALUE
-fiber_initialize(VALUE self, VALUE proc, struct fiber_pool * fiber_pool, unsigned int blocking)
+rb_fiber_storage_aset(VALUE class, VALUE key, VALUE value)
 {
+    key = rb_to_symbol(key);
+
+    VALUE storage = fiber_storage_get(fiber_current(), value != Qnil);
+    if (storage == Qnil) return Qnil;
+
+    if (value == Qnil) {
+        return rb_hash_delete(storage, key);
+    }
+    else {
+        return rb_hash_aset(storage, key, value);
+    }
+}
+
+static VALUE
+fiber_initialize(VALUE self, VALUE proc, struct fiber_pool * fiber_pool, unsigned int blocking, VALUE storage)
+{
+    if (storage == Qundef || storage == Qtrue) {
+        // The default, inherit storage (dup) from the current fiber:
+        storage = inherit_fiber_storage();
+    }
+    else /* nil, hash, etc. */ {
+        fiber_storage_validate(storage);
+        storage = rb_obj_dup(storage);
+    }
+
     rb_fiber_t *fiber = fiber_t_alloc(self, blocking);
 
+    fiber->cont.saved_ec.storage = storage;
     fiber->first_proc = proc;
     fiber->stack.base = NULL;
     fiber->stack.pool = fiber_pool;
@@ -1865,54 +2287,90 @@ rb_fiber_pool_default(VALUE pool)
     return &shared_fiber_pool;
 }
 
+VALUE rb_fiber_inherit_storage(struct rb_execution_context_struct *ec, struct rb_fiber_struct *fiber)
+{
+    VALUE storage = rb_obj_dup(ec->storage);
+    fiber->cont.saved_ec.storage = storage;
+    return storage;
+}
+
 /* :nodoc: */
 static VALUE
 rb_fiber_initialize_kw(int argc, VALUE* argv, VALUE self, int kw_splat)
 {
     VALUE pool = Qnil;
     VALUE blocking = Qfalse;
+    VALUE storage = Qundef;
 
     if (kw_splat != RB_NO_KEYWORDS) {
         VALUE options = Qnil;
-        VALUE arguments[2] = {Qundef};
+        VALUE arguments[3] = {Qundef};
 
         argc = rb_scan_args_kw(kw_splat, argc, argv, ":", &options);
-        rb_get_kwargs(options, fiber_initialize_keywords, 0, 2, arguments);
+        rb_get_kwargs(options, fiber_initialize_keywords, 0, 3, arguments);
 
-        if (arguments[0] != Qundef) {
+        if (!UNDEF_P(arguments[0])) {
             blocking = arguments[0];
         }
 
-        if (arguments[1] != Qundef) {
+        if (!UNDEF_P(arguments[1])) {
             pool = arguments[1];
         }
+
+        storage = arguments[2];
     }
 
-    return fiber_initialize(self, rb_block_proc(), rb_fiber_pool_default(pool), RTEST(blocking));
+    return fiber_initialize(self, rb_block_proc(), rb_fiber_pool_default(pool), RTEST(blocking), storage);
 }
 
 /*
  *  call-seq:
- *     Fiber.new(blocking: false) { |*args| ... } -> fiber
+ *     Fiber.new(blocking: false, storage: true) { |*args| ... } -> fiber
  *
- *  Creates new Fiber. Initially, the fiber is not running and can be resumed with
- *  #resume. Arguments to the first #resume call will be passed to the block:
+ *  Creates new Fiber. Initially, the fiber is not running and can be resumed
+ *  with #resume. Arguments to the first #resume call will be passed to the
+ *  block:
  *
- *      f = Fiber.new do |initial|
- *         current = initial
- *         loop do
- *           puts "current: #{current.inspect}"
- *           current = Fiber.yield
- *         end
- *      end
- *      f.resume(100)     # prints: current: 100
- *      f.resume(1, 2, 3) # prints: current: [1, 2, 3]
- *      f.resume          # prints: current: nil
- *      # ... and so on ...
- *
- *  If <tt>blocking: false</tt> is passed to <tt>Fiber.new</tt>, _and_ current thread
- *  has a Fiber.scheduler defined, the Fiber becomes non-blocking (see "Non-blocking
- *  Fibers" section in class docs).
+ *    f = Fiber.new do |initial|
+ *       current = initial
+ *       loop do
+ *         puts "current: #{current.inspect}"
+ *         current = Fiber.yield
+ *       end
+ *    end
+ *    f.resume(100)     # prints: current: 100
+ *    f.resume(1, 2, 3) # prints: current: [1, 2, 3]
+ *    f.resume          # prints: current: nil
+ *    # ... and so on ...
+ *
+ *  If <tt>blocking: false</tt> is passed to <tt>Fiber.new</tt>, _and_ current
+ *  thread has a Fiber.scheduler defined, the Fiber becomes non-blocking (see
+ *  "Non-blocking Fibers" section in class docs).
+ *
+ *  If the <tt>storage</tt> is unspecified, the default is to inherit a copy of
+ *  the storage from the current fiber. This is the same as specifying
+ *  <tt>storage: true</tt>.
+ *
+ *    Fiber[:x] = 1
+ *    Fiber.new do
+ *      Fiber[:x] # => 1
+ *      Fiber[:x] = 2
+ *    end.resume
+ *    Fiber[:x] # => 1
+ *
+ *  If the given <tt>storage</tt> is <tt>nil</tt>, this function will lazy
+ *  initialize the internal storage, which starts as an empty hash.
+ *
+ *    Fiber[:x] = "Hello World"
+ *    Fiber.new(storage: nil) do
+ *      Fiber[:x] # nil
+ *    end
+ *
+ *  Otherwise, the given <tt>storage</tt> is used as the new fiber's storage,
+ *  and it must be an instance of Hash.
+ *
+ *  Explicitly using <tt>storage: true</tt> is currently experimental and may
+ *  change in the future.
  */
 static VALUE
 rb_fiber_initialize(int argc, VALUE* argv, VALUE self)
@@ -1921,9 +2379,15 @@ rb_fiber_initialize(int argc, VALUE* argv, VALUE self)
 }
 
 VALUE
+rb_fiber_new_storage(rb_block_call_func_t func, VALUE obj, VALUE storage)
+{
+    return fiber_initialize(fiber_alloc(rb_cFiber), rb_proc_new(func, obj), rb_fiber_pool_default(Qnil), 0, storage);
+}
+
+VALUE
 rb_fiber_new(rb_block_call_func_t func, VALUE obj)
 {
-    return fiber_initialize(fiber_alloc(rb_cFiber), rb_proc_new(func, obj), rb_fiber_pool_default(Qnil), 1);
+    return rb_fiber_new_storage(func, obj, Qtrue);
 }
 
 static VALUE
@@ -1934,7 +2398,7 @@ rb_fiber_s_schedule_kw(int argc, VALUE* argv, int kw_splat)
     VALUE fiber = Qnil;
 
     if (scheduler != Qnil) {
-        fiber = rb_funcall_passing_block_kw(scheduler, rb_intern("fiber"), argc, argv, kw_splat);
+        fiber = rb_fiber_scheduler_fiber(scheduler, argc, argv, kw_splat);
     }
     else {
         rb_raise(rb_eRuntimeError, "No scheduler is available!");
@@ -1977,7 +2441,7 @@ rb_fiber_s_schedule_kw(int argc, VALUE* argv, int kw_splat)
  *
  *  Note that the behavior described above is how the method is <em>expected</em>
  *  to behave, actual behavior is up to the current scheduler's implementation of
- *  Fiber::SchedulerInterface#fiber method. Ruby doesn't enforce this method to
+ *  Fiber::Scheduler#fiber method. Ruby doesn't enforce this method to
  *  behave in any particular way.
  *
  *  If the scheduler is not set, the method raises
@@ -1996,7 +2460,7 @@ rb_fiber_s_schedule(int argc, VALUE *argv, VALUE obj)
  *
  *  Returns the Fiber scheduler, that was last set for the current thread with Fiber.set_scheduler.
  *  Returns +nil+ if no scheduler is set (which is the default), and non-blocking fibers'
- #  behavior is the same as blocking.
+ *  behavior is the same as blocking.
  *  (see "Non-blocking fibers" section in class docs for details about the scheduler concept).
  *
  */
@@ -2030,7 +2494,7 @@ rb_fiber_current_scheduler(VALUE klass)
  *  thread will call scheduler's +close+ method on finalization (allowing the scheduler to
  *  properly manage all non-finished fibers).
  *
- *  +scheduler+ can be an object of any class corresponding to Fiber::SchedulerInterface. Its
+ *  +scheduler+ can be an object of any class corresponding to Fiber::Scheduler. Its
  *  implementation is up to the user.
  *
  *  See also the "Non-blocking fibers" section in class docs.
@@ -2051,7 +2515,6 @@ rb_fiber_start(rb_fiber_t *fiber)
 
     rb_proc_t *proc;
     enum ruby_tag_type state;
-    int need_interrupt = TRUE;
 
     VM_ASSERT(th->ec == GET_EC());
     VM_ASSERT(FIBER_RESUMED_P(fiber));
@@ -2077,6 +2540,7 @@ rb_fiber_start(rb_fiber_t *fiber)
     }
     EC_POP_TAG();
 
+    int need_interrupt = TRUE;
     VALUE err = Qfalse;
     if (state) {
         err = th->ec->errinfo;
@@ -2085,54 +2549,52 @@ rb_fiber_start(rb_fiber_t *fiber)
         if (state == TAG_RAISE) {
             // noop...
         }
+        else if (state == TAG_FATAL && err == RUBY_FATAL_FIBER_KILLED) {
+            need_interrupt = FALSE;
+            err = Qfalse;
+        }
         else if (state == TAG_FATAL) {
             rb_threadptr_pending_interrupt_enque(th, err);
         }
         else {
             err = rb_vm_make_jump_tag_but_local_jump(state, err);
         }
-        need_interrupt = TRUE;
     }
 
     rb_fiber_terminate(fiber, need_interrupt, err);
 }
 
-static rb_fiber_t *
-root_fiber_alloc(rb_thread_t *th)
-{
-    VALUE fiber_value = fiber_alloc(rb_cFiber);
-    rb_fiber_t *fiber = th->ec->fiber_ptr;
-
-    VM_ASSERT(DATA_PTR(fiber_value) == NULL);
-    VM_ASSERT(fiber->cont.type == FIBER_CONTEXT);
-    VM_ASSERT(fiber->status == FIBER_RESUMED);
-
-    th->root_fiber = fiber;
-    DATA_PTR(fiber_value) = fiber;
-    fiber->cont.self = fiber_value;
-
-    coroutine_initialize_main(&fiber->context);
-
-    return fiber;
-}
-
+// Set up a "root fiber", which is the fiber that every Ractor has.
 void
 rb_threadptr_root_fiber_setup(rb_thread_t *th)
 {
-    rb_fiber_t *fiber = ruby_mimmalloc(sizeof(rb_fiber_t));
+    rb_fiber_t *fiber = ruby_mimcalloc(1, sizeof(rb_fiber_t));
     if (!fiber) {
         rb_bug("%s", strerror(errno)); /* ... is it possible to call rb_bug here? */
     }
-    MEMZERO(fiber, rb_fiber_t, 1);
+
     fiber->cont.type = FIBER_CONTEXT;
     fiber->cont.saved_ec.fiber_ptr = fiber;
+    fiber->cont.saved_ec.serial = next_ec_serial(th->ractor);
     fiber->cont.saved_ec.thread_ptr = th;
     fiber->blocking = 1;
+    fiber->killed = 0;
     fiber_status_set(fiber, FIBER_RESUMED); /* skip CREATED */
+
+    coroutine_initialize_main(&fiber->context);
+
     th->ec = &fiber->cont.saved_ec;
-    // This skips mjit_cont_new for the initial thread because mjit_enabled is always false
-    // at this point. mjit_init calls rb_fiber_init_mjit_cont again for this root_fiber.
-    rb_fiber_init_mjit_cont(fiber);
+
+    cont_init_jit_cont(&fiber->cont);
+}
+
+void
+rb_root_fiber_obj_setup(rb_thread_t *th)
+{
+    rb_fiber_t *fiber = th->ec->fiber_ptr;
+    VALUE fiber_value = fiber_alloc(rb_cFiber);
+    DATA_PTR(fiber_value) = fiber;
+    fiber->cont.self = fiber_value;
 }
 
 void
@@ -2142,12 +2604,12 @@ rb_threadptr_root_fiber_release(rb_thread_t *th)
         /* ignore. A root fiber object will free th->ec */
     }
     else {
-        rb_execution_context_t *ec = GET_EC();
+        rb_execution_context_t *ec = rb_current_execution_context(false);
 
         VM_ASSERT(th->ec->fiber_ptr->cont.type == FIBER_CONTEXT);
         VM_ASSERT(th->ec->fiber_ptr->cont.self == 0);
 
-        if (th->ec == ec) {
+        if (ec && th->ec == ec) {
             rb_ractor_set_current_ec(th->ractor, NULL);
         }
         fiber_free(th->ec->fiber_ptr);
@@ -2167,16 +2629,6 @@ rb_threadptr_root_fiber_terminate(rb_thread_t *th)
 }
 
 static inline rb_fiber_t*
-fiber_current(void)
-{
-    rb_execution_context_t *ec = GET_EC();
-    if (ec->fiber_ptr->cont.self == 0) {
-        root_fiber_alloc(rb_ec_thread_ptr(ec));
-    }
-    return ec->fiber_ptr;
-}
-
-static inline rb_fiber_t*
 return_fiber(bool terminate)
 {
     rb_fiber_t *fiber = fiber_current();
@@ -2215,15 +2667,7 @@ rb_fiber_current(void)
 static inline void
 fiber_store(rb_fiber_t *next_fiber, rb_thread_t *th)
 {
-    rb_fiber_t *fiber;
-
-    if (th->ec->fiber_ptr != NULL) {
-        fiber = th->ec->fiber_ptr;
-    }
-    else {
-        /* create root fiber */
-        fiber = root_fiber_alloc(th);
-    }
+    rb_fiber_t *fiber = th->ec->fiber_ptr;
 
     if (FIBER_CREATED_P(next_fiber)) {
         fiber_prepare_stack(next_fiber);
@@ -2238,6 +2682,19 @@ fiber_store(rb_fiber_t *next_fiber, rb_thread_t *th)
     fiber_setcontext(next_fiber, fiber);
 }
 
+static void
+fiber_check_killed(rb_fiber_t *fiber)
+{
+    VM_ASSERT(fiber == fiber_current());
+
+    if (fiber->killed) {
+        rb_thread_t *thread = fiber->cont.saved_ec.thread_ptr;
+
+        thread->ec->errinfo = RUBY_FATAL_FIBER_KILLED;
+        EC_JUMP_TAG(thread->ec, RUBY_TAG_FATAL);
+    }
+}
+
 static inline VALUE
 fiber_switch(rb_fiber_t *fiber, int argc, const VALUE *argv, int kw_splat, rb_fiber_t *resuming_fiber, bool yielding)
 {
@@ -2246,7 +2703,9 @@ fiber_switch(rb_fiber_t *fiber, int argc, const VALUE *argv, int kw_splat, rb_fi
     rb_thread_t *th = GET_THREAD();
 
     /* make sure the root_fiber object is available */
-    if (th->root_fiber == NULL) root_fiber_alloc(th);
+    if (th->root_fiber == NULL) {
+        th->root_fiber = th->ec->fiber_ptr;
+    }
 
     if (th->ec->fiber_ptr == fiber) {
         /* ignore fiber context switch
@@ -2312,7 +2771,9 @@ fiber_switch(rb_fiber_t *fiber, int argc, const VALUE *argv, int kw_splat, rb_fi
     // We cannot free the stack until the pthread is joined:
 #ifndef COROUTINE_PTHREAD_CONTEXT
     if (resuming_fiber && FIBER_TERMINATED_P(fiber)) {
-        fiber_stack_release(fiber);
+        RB_VM_LOCKING() {
+            fiber_stack_release(fiber);
+        }
     }
 #endif
 
@@ -2326,7 +2787,14 @@ fiber_switch(rb_fiber_t *fiber, int argc, const VALUE *argv, int kw_splat, rb_fi
 
     current_fiber = th->ec->fiber_ptr;
     value = current_fiber->cont.value;
-    if (current_fiber->cont.argc == -1) rb_exc_raise(value);
+
+    fiber_check_killed(current_fiber);
+
+    if (current_fiber->cont.argc == -1) {
+        // Fiber#raise will trigger this path.
+        rb_exc_raise(value);
+    }
+
     return value;
 }
 
@@ -2353,7 +2821,62 @@ rb_fiber_transfer(VALUE fiber_value, int argc, const VALUE *argv)
 VALUE
 rb_fiber_blocking_p(VALUE fiber)
 {
-    return RBOOL(fiber_ptr(fiber)->blocking != 0);
+    return RBOOL(fiber_ptr(fiber)->blocking);
+}
+
+static VALUE
+fiber_blocking_yield(VALUE fiber_value)
+{
+    rb_fiber_t *fiber = fiber_ptr(fiber_value);
+    rb_thread_t * volatile th = fiber->cont.saved_ec.thread_ptr;
+
+    VM_ASSERT(fiber->blocking == 0);
+
+    // fiber->blocking is `unsigned int : 1`, so we use it as a boolean:
+    fiber->blocking = 1;
+
+    // Once the fiber is blocking, and current, we increment the thread blocking state:
+    th->blocking += 1;
+
+    return rb_yield(fiber_value);
+}
+
+static VALUE
+fiber_blocking_ensure(VALUE fiber_value)
+{
+    rb_fiber_t *fiber = fiber_ptr(fiber_value);
+    rb_thread_t * volatile th = fiber->cont.saved_ec.thread_ptr;
+
+    // We are no longer blocking:
+    fiber->blocking = 0;
+    th->blocking -= 1;
+
+    return Qnil;
+}
+
+/*
+ *  call-seq:
+ *     Fiber.blocking{|fiber| ...} -> result
+ *
+ *  Forces the fiber to be blocking for the duration of the block. Returns the
+ *  result of the block.
+ *
+ *  See the "Non-blocking fibers" section in class docs for details.
+ *
+ */
+VALUE
+rb_fiber_blocking(VALUE class)
+{
+    VALUE fiber_value = rb_fiber_current();
+    rb_fiber_t *fiber = fiber_ptr(fiber_value);
+
+    // If we are already blocking, this is essentially a no-op:
+    if (fiber->blocking) {
+        return rb_yield(fiber_value);
+    }
+    else {
+        return rb_ensure(fiber_blocking_yield, fiber_value, fiber_blocking_ensure, fiber_value);
+    }
 }
 
 /*
@@ -2390,6 +2913,7 @@ void
 rb_fiber_close(rb_fiber_t *fiber)
 {
     fiber_status_set(fiber, FIBER_TERMINATED);
+    rb_ec_close(&fiber->cont.saved_ec);
 }
 
 static void
@@ -2439,9 +2963,7 @@ fiber_resume_kw(rb_fiber_t *fiber, int argc, const VALUE *argv, int kw_splat)
         rb_raise(rb_eFiberError, "attempt to resume a transferring fiber");
     }
 
-    VALUE result = fiber_switch(fiber, argc, argv, kw_splat, fiber, false);
-
-    return result;
+    return fiber_switch(fiber, argc, argv, kw_splat, fiber, false);
 }
 
 VALUE
@@ -2713,12 +3235,13 @@ rb_fiber_s_yield(int argc, VALUE *argv, VALUE klass)
 }
 
 static VALUE
-fiber_raise(rb_fiber_t *fiber, int argc, const VALUE *argv)
+fiber_raise(rb_fiber_t *fiber, VALUE exception)
 {
-    VALUE exception = rb_make_exception(argc, argv);
-
-    if (fiber->resuming_fiber) {
-        rb_raise(rb_eFiberError, "attempt to raise a resuming fiber");
+    if (fiber == fiber_current()) {
+        rb_exc_raise(exception);
+    }
+    else if (fiber->resuming_fiber) {
+        return fiber_raise(fiber->resuming_fiber, exception);
     }
     else if (FIBER_SUSPENDED_P(fiber) && !fiber->yielding) {
         return fiber_transfer_kw(fiber, -1, &exception, RB_NO_KEYWORDS);
@@ -2729,31 +3252,46 @@ fiber_raise(rb_fiber_t *fiber, int argc, const VALUE *argv)
 }
 
 VALUE
-rb_fiber_raise(VALUE fiber, int argc, const VALUE *argv)
+rb_fiber_raise(VALUE fiber, int argc, VALUE *argv)
 {
-    return fiber_raise(fiber_ptr(fiber), argc, argv);
+    VALUE exception = rb_exception_setup(argc, argv);
+
+    return fiber_raise(fiber_ptr(fiber), exception);
 }
 
 /*
  *  call-seq:
- *     fiber.raise                                 -> obj
- *     fiber.raise(string)                         -> obj
- *     fiber.raise(exception [, string [, array]]) -> obj
+ *    raise(exception, message = exception.to_s, backtrace = nil, cause: $!)
+ *    raise(message = nil, cause: $!)
  *
  *  Raises an exception in the fiber at the point at which the last
- *  +Fiber.yield+ was called. If the fiber has not been started or has
+ *  +Fiber.yield+ was called.
+ *
+ *     f = Fiber.new {
+ *       puts "Before the yield"
+ *       Fiber.yield 1 # -- exception will be raised here
+ *       puts "After the yield"
+ *     }
+ *
+ *     p f.resume
+ *     f.raise "Gotcha"
+ *
+ *  Output
+ *
+ *     Before the first yield
+ *     1
+ *     t.rb:8:in 'Fiber.yield': Gotcha (RuntimeError)
+ *       from t.rb:8:in 'block in <main>'
+ *
+ *  If the fiber has not been started or has
  *  already run to completion, raises +FiberError+. If the fiber is
  *  yielding, it is resumed. If it is transferring, it is transferred into.
  *  But if it is resuming, raises +FiberError+.
  *
- *  With no arguments, raises a +RuntimeError+. With a single +String+
- *  argument, raises a +RuntimeError+ with the string as a message.  Otherwise,
- *  the first parameter should be the name of an +Exception+ class (or an
- *  object that returns an +Exception+ object when sent an +exception+
- *  message). The optional second parameter sets the message associated with
- *  the exception, and the third parameter is an array of callback information.
- *  Exceptions are caught by the +rescue+ clause of <code>begin...end</code>
- *  blocks.
+ *  Raises +FiberError+ if called on a Fiber belonging to another +Thread+.
+ *
+ *  See Kernel#raise for more information on arguments.
+ *
  */
 static VALUE
 rb_fiber_m_raise(int argc, VALUE *argv, VALUE self)
@@ -2763,6 +3301,46 @@ rb_fiber_m_raise(int argc, VALUE *argv, VALUE self)
 
 /*
  *  call-seq:
+ *     fiber.kill -> nil
+ *
+ *  Terminates the fiber by raising an uncatchable exception.
+ *  It only terminates the given fiber and no other fiber, returning +nil+ to
+ *  another fiber if that fiber was calling #resume or #transfer.
+ *
+ *  <tt>Fiber#kill</tt> only interrupts another fiber when it is in Fiber.yield.
+ *  If called on the current fiber then it raises that exception at the <tt>Fiber#kill</tt> call site.
+ *
+ *  If the fiber has not been started, transition directly to the terminated state.
+ *
+ *  If the fiber is already terminated, does nothing.
+ *
+ *  Raises FiberError if called on a fiber belonging to another thread.
+ */
+static VALUE
+rb_fiber_m_kill(VALUE self)
+{
+    rb_fiber_t *fiber = fiber_ptr(self);
+
+    if (fiber->killed) return Qfalse;
+    fiber->killed = 1;
+
+    if (fiber->status == FIBER_CREATED) {
+        fiber->status = FIBER_TERMINATED;
+    }
+    else if (fiber->status != FIBER_TERMINATED) {
+        if (fiber_current() == fiber) {
+            fiber_check_killed(fiber);
+        }
+        else {
+            fiber_raise(fiber_ptr(self), Qnil);
+        }
+    }
+
+    return self;
+}
+
+/*
+ *  call-seq:
  *     Fiber.current -> fiber
  *
  *  Returns the current fiber. If you are not running in the context of
@@ -2808,6 +3386,8 @@ rb_fiber_atfork(rb_thread_t *th)
             th->root_fiber = th->ec->fiber_ptr;
         }
         th->root_fiber->prev = 0;
+        th->root_fiber->blocking = 1;
+        th->blocking = 1;
     }
 }
 #endif
@@ -2893,329 +3473,6 @@ rb_fiber_pool_initialize(int argc, VALUE* argv, VALUE self)
  *     fiber.resume #=> FiberError: dead fiber called
  */
 
-/*
- *  Document-class: Fiber::SchedulerInterface
- *
- *  This is not an existing class, but documentation of the interface that Scheduler
- *  object should comply to in order to be used as argument to Fiber.scheduler and handle non-blocking
- *  fibers. See also the "Non-blocking fibers" section in Fiber class docs for explanations
- *  of some concepts.
- *
- *  Scheduler's behavior and usage are expected to be as follows:
- *
- *  * When the execution in the non-blocking Fiber reaches some blocking operation (like
- *    sleep, wait for a process, or a non-ready I/O), it calls some of the scheduler's
- *    hook methods, listed below.
- *  * Scheduler somehow registers what the current fiber is waiting on, and yields control
- *    to other fibers with Fiber.yield (so the fiber would be suspended while expecting its
- *    wait to end, and other fibers in the same thread can perform)
- *  * At the end of the current thread execution, the scheduler's method #close is called
- *  * The scheduler runs into a wait loop, checking all the blocked fibers (which it has
- *    registered on hook calls) and resuming them when the awaited resource is ready
- *    (e.g. I/O ready or sleep time elapsed).
- *
- *  A typical implementation would probably rely for this closing loop on a gem like
- *  EventMachine[https://github.com/eventmachine/eventmachine] or
- *  Async[https://github.com/socketry/async].
- *
- *  This way concurrent execution will be achieved transparently for every
- *  individual Fiber's code.
- *
- *  Hook methods are:
- *
- *  * #io_wait, #io_read, and #io_write
- *  * #process_wait
- *  * #kernel_sleep
- *  * #timeout_after
- *  * #address_resolve
- *  * #block and #unblock
- *  * (the list is expanded as Ruby developers make more methods having non-blocking calls)
- *
- *  When not specified otherwise, the hook implementations are mandatory: if they are not
- *  implemented, the methods trying to call hook will fail. To provide backward compatibility,
- *  in the future hooks will be optional (if they are not implemented, due to the scheduler
- *  being created for the older Ruby version, the code which needs this hook will not fail,
- *  and will just behave in a blocking fashion).
- *
- *  It is also strongly recommended that the scheduler implements the #fiber method, which is
- *  delegated to by Fiber.schedule.
- *
- *  Sample _toy_ implementation of the scheduler can be found in Ruby's code, in
- *  <tt>test/fiber/scheduler.rb</tt>
- *
- */
-
-#if 0 /* for RDoc */
-/*
- *
- *  Document-method: Fiber::SchedulerInterface#close
- *
- *  Called when the current thread exits. The scheduler is expected to implement this
- *  method in order to allow all waiting fibers to finalize their execution.
- *
- *  The suggested pattern is to implement the main event loop in the #close method.
- *
- */
-static VALUE
-rb_fiber_scheduler_interface_close(VALUE self)
-{
-}
-
-/*
- *  Document-method: SchedulerInterface#process_wait
- *  call-seq: process_wait(pid, flags)
- *
- *  Invoked by Process::Status.wait in order to wait for a specified process.
- *  See that method description for arguments description.
- *
- *  Suggested minimal implementation:
- *
- *      Thread.new do
- *        Process::Status.wait(pid, flags)
- *      end.value
- *
- *  This hook is optional: if it is not present in the current scheduler,
- *  Process::Status.wait will behave as a blocking method.
- *
- *  Expected to return a Process::Status instance.
- */
-static VALUE
-rb_fiber_scheduler_interface_process_wait(VALUE self)
-{
-}
-
-/*
- *  Document-method: SchedulerInterface#io_wait
- *  call-seq: io_wait(io, events, timeout)
- *
- *  Invoked by IO#wait, IO#wait_readable, IO#wait_writable to ask whether the
- *  specified descriptor is ready for specified events within
- *  the specified +timeout+.
- *
- *  +events+ is a bit mask of <tt>IO::READABLE</tt>, <tt>IO::WRITABLE</tt>, and
- *  <tt>IO::PRIORITY</tt>.
- *
- *  Suggested implementation should register which Fiber is waiting for which
- *  resources and immediately calling Fiber.yield to pass control to other
- *  fibers. Then, in the #close method, the scheduler might dispatch all the
- *  I/O resources to fibers waiting for it.
- *
- *  Expected to return the subset of events that are ready immediately.
- *
- */
-static VALUE
-rb_fiber_scheduler_interface_io_wait(VALUE self)
-{
-}
-
-/*
- *  Document-method: SchedulerInterface#io_read
- *  call-seq: io_read(io, buffer, length) -> read length or -errno
- *
- *  Invoked by IO#read to read +length+ bytes from +io+ into a specified
- *  +buffer+ (see IO::Buffer).
- *
- *  The +length+ argument is the "minimum length to be read".
- *  If the IO buffer size is 8KiB, but the +length+ is +1024+ (1KiB), up to
- *  8KiB might be read, but at least 1KiB will be.
- *  Generally, the only case where less data than +length+ will be read is if
- *  there is an error reading the data.
- *
- *  Specifying a +length+ of 0 is valid and means try reading at least once
- *  and return any available data.
- *
- *  Suggested implementation should try to read from +io+ in a non-blocking
- *  manner and call #io_wait if the +io+ is not ready (which will yield control
- *  to other fibers).
- *
- *  See IO::Buffer for an interface available to return data.
- *
- *  Expected to return number of bytes read, or, in case of an error, <tt>-errno</tt>
- *  (negated number corresponding to system's error code).
- *
- *  The method should be considered _experimental_.
- */
-static VALUE
-rb_fiber_scheduler_interface_io_read(VALUE self)
-{
-}
-
-/*
- *  Document-method: SchedulerInterface#io_write
- *  call-seq: io_write(io, buffer, length) -> written length or -errno
- *
- *  Invoked by IO#write to write +length+ bytes to +io+ from
- *  from a specified +buffer+ (see IO::Buffer).
- *
- *  The +length+ argument is the "(minimum) length to be written".
- *  If the IO buffer size is 8KiB, but the +length+ specified is 1024 (1KiB),
- *  at most 8KiB will be written, but at least 1KiB will be.
- *  Generally, the only case where less data than +length+ will be written is if
- *  there is an error writing the data.
- *
- *  Specifying a +length+ of 0 is valid and means try writing at least once,
- *  as much data as possible.
- *
- *  Suggested implementation should try to write to +io+ in a non-blocking
- *  manner and call #io_wait if the +io+ is not ready (which will yield control
- *  to other fibers).
- *
- *  See IO::Buffer for an interface available to get data from buffer efficiently.
- *
- *  Expected to return number of bytes written, or, in case of an error, <tt>-errno</tt>
- *  (negated number corresponding to system's error code).
- *
- *  The method should be considered _experimental_.
- */
-static VALUE
-rb_fiber_scheduler_interface_io_write(VALUE self)
-{
-}
-
-/*
- *  Document-method: SchedulerInterface#kernel_sleep
- *  call-seq: kernel_sleep(duration = nil)
- *
- *  Invoked by Kernel#sleep and Mutex#sleep and is expected to provide
- *  an implementation of sleeping in a non-blocking way. Implementation might
- *  register the current fiber in some list of "which fiber wait until what
- *  moment", call Fiber.yield to pass control, and then in #close resume
- *  the fibers whose wait period has elapsed.
- *
- */
-static VALUE
-rb_fiber_scheduler_interface_kernel_sleep(VALUE self)
-{
-}
-
-/*
- *  Document-method: SchedulerInterface#address_resolve
- *  call-seq: address_resolve(hostname) -> array_of_strings or nil
- *
- *  Invoked by any method that performs a non-reverse DNS lookup. The most
- *  notable method is Addrinfo.getaddrinfo, but there are many other.
- *
- *  The method is expected to return an array of strings corresponding to ip
- *  addresses the +hostname+ is resolved to, or +nil+ if it can not be resolved.
- *
- *  Fairly exhaustive list of all possible call-sites:
- *
- *  - Addrinfo.getaddrinfo
- *  - Addrinfo.tcp
- *  - Addrinfo.udp
- *  - Addrinfo.ip
- *  - Addrinfo.new
- *  - Addrinfo.marshal_load
- *  - SOCKSSocket.new
- *  - TCPServer.new
- *  - TCPSocket.new
- *  - IPSocket.getaddress
- *  - TCPSocket.gethostbyname
- *  - UDPSocket#connect
- *  - UDPSocket#bind
- *  - UDPSocket#send
- *  - Socket.getaddrinfo
- *  - Socket.gethostbyname
- *  - Socket.pack_sockaddr_in
- *  - Socket.sockaddr_in
- *  - Socket.unpack_sockaddr_in
- */
-static VALUE
-rb_fiber_scheduler_interface_address_resolve(VALUE self)
-{
-}
-
-/*
- *  Document-method: SchedulerInterface#timeout_after
- *  call-seq: timeout_after(duration, exception_class, *exception_arguments, &block) -> result of block
- *
- *  Invoked by Timeout.timeout to execute the given +block+ within the given
- *  +duration+. It can also be invoked directly by the scheduler or user code.
- *
- *  Attempt to limit the execution time of a given +block+ to the given
- *  +duration+ if possible. When a non-blocking operation causes the +block+'s
- *  execution time to exceed the specified +duration+, that non-blocking
- *  operation should be interrupted by raising the specified +exception_class+
- *  constructed with the given +exception_arguments+.
- *
- *  General execution timeouts are often considered risky. This implementation
- *  will only interrupt non-blocking operations. This is by design because it's
- *  expected that non-blocking operations can fail for a variety of
- *  unpredictable reasons, so applications should already be robust in handling
- *  these conditions and by implication timeouts.
- *
- *  However, as a result of this design, if the +block+ does not invoke any
- *  non-blocking operations, it will be impossible to interrupt it. If you
- *  desire to provide predictable points for timeouts, consider adding
- *  +sleep(0)+.
- *
- *  If the block is executed successfully, its result will be returned.
- *
- *  The exception will typically be raised using Fiber#raise.
- */
-static VALUE
-rb_fiber_scheduler_interface_timeout_after(VALUE self)
-{
-}
-
-/*
- *  Document-method: SchedulerInterface#block
- *  call-seq: block(blocker, timeout = nil)
- *
- *  Invoked by methods like Thread.join, and by Mutex, to signify that current
- *  Fiber is blocked until further notice (e.g. #unblock) or until +timeout+ has
- *  elapsed.
- *
- *  +blocker+ is what we are waiting on, informational only (for debugging and
- *  logging). There are no guarantee about its value.
- *
- *  Expected to return boolean, specifying whether the blocking operation was
- *  successful or not.
- */
-static VALUE
-rb_fiber_scheduler_interface_block(VALUE self)
-{
-}
-
-/*
- *  Document-method: SchedulerInterface#unblock
- *  call-seq: unblock(blocker, fiber)
- *
- *  Invoked to wake up Fiber previously blocked with #block (for example, Mutex#lock
- *  calls #block and Mutex#unlock calls #unblock). The scheduler should use
- *  the +fiber+ parameter to understand which fiber is unblocked.
- *
- *  +blocker+ is what was awaited for, but it is informational only (for debugging
- *  and logging), and it is not guaranteed to be the same value as the +blocker+ for
- *  #block.
- *
- */
-static VALUE
-rb_fiber_scheduler_interface_unblock(VALUE self)
-{
-}
-
-/*
- *  Document-method: SchedulerInterface#fiber
- *  call-seq: fiber(&block)
- *
- *  Implementation of the Fiber.schedule. The method is <em>expected</em> to immediately
- *  run the given block of code in a separate non-blocking fiber, and to return that Fiber.
- *
- *  Minimal suggested implementation is:
- *
- *     def fiber(&block)
- *       fiber = Fiber.new(blocking: false, &block)
- *       fiber.resume
- *       fiber
- *     end
- */
-static VALUE
-rb_fiber_scheduler_interface_fiber(VALUE self)
-{
-}
-#endif
-
 void
 Init_Cont(void)
 {
@@ -3237,10 +3494,20 @@ Init_Cont(void)
 
     fiber_initialize_keywords[0] = rb_intern_const("blocking");
     fiber_initialize_keywords[1] = rb_intern_const("pool");
+    fiber_initialize_keywords[2] = rb_intern_const("storage");
 
     const char *fiber_shared_fiber_pool_free_stacks = getenv("RUBY_SHARED_FIBER_POOL_FREE_STACKS");
     if (fiber_shared_fiber_pool_free_stacks) {
         shared_fiber_pool.free_stacks = atoi(fiber_shared_fiber_pool_free_stacks);
+
+        if (shared_fiber_pool.free_stacks < 0) {
+            rb_warn("Setting RUBY_SHARED_FIBER_POOL_FREE_STACKS to a negative value is not allowed.");
+            shared_fiber_pool.free_stacks = 0;
+        }
+
+        if (shared_fiber_pool.free_stacks > 1) {
+            rb_warn("Setting RUBY_SHARED_FIBER_POOL_FREE_STACKS to a value greater than 1 is operating system specific, and may cause crashes.");
+        }
     }
 
     rb_cFiber = rb_define_class("Fiber", rb_cObject);
@@ -3248,10 +3515,17 @@ Init_Cont(void)
     rb_eFiberError = rb_define_class("FiberError", rb_eStandardError);
     rb_define_singleton_method(rb_cFiber, "yield", rb_fiber_s_yield, -1);
     rb_define_singleton_method(rb_cFiber, "current", rb_fiber_s_current, 0);
+    rb_define_singleton_method(rb_cFiber, "blocking", rb_fiber_blocking, 0);
+    rb_define_singleton_method(rb_cFiber, "[]", rb_fiber_storage_aref, 1);
+    rb_define_singleton_method(rb_cFiber, "[]=", rb_fiber_storage_aset, 2);
+
     rb_define_method(rb_cFiber, "initialize", rb_fiber_initialize, -1);
     rb_define_method(rb_cFiber, "blocking?", rb_fiber_blocking_p, 0);
+    rb_define_method(rb_cFiber, "storage", rb_fiber_storage_get, 0);
+    rb_define_method(rb_cFiber, "storage=", rb_fiber_storage_set, 1);
     rb_define_method(rb_cFiber, "resume", rb_fiber_m_resume, -1);
     rb_define_method(rb_cFiber, "raise", rb_fiber_m_raise, -1);
+    rb_define_method(rb_cFiber, "kill", rb_fiber_m_kill, 0);
     rb_define_method(rb_cFiber, "backtrace", rb_fiber_backtrace, -1);
     rb_define_method(rb_cFiber, "backtrace_locations", rb_fiber_backtrace_locations, -1);
     rb_define_method(rb_cFiber, "to_s", fiber_to_s, 0);
@@ -3266,22 +3540,15 @@ Init_Cont(void)
 
     rb_define_singleton_method(rb_cFiber, "schedule", rb_fiber_s_schedule, -1);
 
-#if 0 /* for RDoc */
-    rb_cFiberScheduler = rb_define_class_under(rb_cFiber, "SchedulerInterface", rb_cObject);
-    rb_define_method(rb_cFiberScheduler, "close", rb_fiber_scheduler_interface_close, 0);
-    rb_define_method(rb_cFiberScheduler, "process_wait", rb_fiber_scheduler_interface_process_wait, 0);
-    rb_define_method(rb_cFiberScheduler, "io_wait", rb_fiber_scheduler_interface_io_wait, 0);
-    rb_define_method(rb_cFiberScheduler, "io_read", rb_fiber_scheduler_interface_io_read, 0);
-    rb_define_method(rb_cFiberScheduler, "io_write", rb_fiber_scheduler_interface_io_write, 0);
-    rb_define_method(rb_cFiberScheduler, "kernel_sleep", rb_fiber_scheduler_interface_kernel_sleep, 0);
-    rb_define_method(rb_cFiberScheduler, "address_resolve", rb_fiber_scheduler_interface_address_resolve, 0);
-    rb_define_method(rb_cFiberScheduler, "timeout_after", rb_fiber_scheduler_interface_timeout_after, 0);
-    rb_define_method(rb_cFiberScheduler, "block", rb_fiber_scheduler_interface_block, 0);
-    rb_define_method(rb_cFiberScheduler, "unblock", rb_fiber_scheduler_interface_unblock, 0);
-    rb_define_method(rb_cFiberScheduler, "fiber", rb_fiber_scheduler_interface_fiber, 0);
-#endif
+    rb_thread_t *current_thread = rb_current_thread();
+    RUBY_ASSERT(CLASS_OF(current_thread->ec->fiber_ptr->cont.self) == 0);
+    *(VALUE *)&((struct RBasic *)current_thread->ec->fiber_ptr->cont.self)->klass = rb_cFiber;
 
 #ifdef RB_EXPERIMENTAL_FIBER_POOL
+    /*
+     * Document-class: Fiber::Pool
+     * :nodoc: experimental
+     */
     rb_cFiberPool = rb_define_class_under(rb_cFiber, "Pool", rb_cObject);
     rb_define_alloc_func(rb_cFiberPool, fiber_pool_alloc);
     rb_define_method(rb_cFiberPool, "initialize", rb_fiber_pool_initialize, -1);
diff --git a/coroutine/amd64/Context.S b/coroutine/amd64/Context.S
index d50732adbc..4b94d31f30 100644
--- a/coroutine/amd64/Context.S
+++ b/coroutine/amd64/Context.S
@@ -5,37 +5,51 @@
 ##  Copyright, 2018, by Samuel Williams.
 ##
 
+/* Important - do _not_ include <cet.h> in this file; doing so will
+ * cause an incorrect .note.gnu.property section to be emitted. We have
+ * one at the bottom of this file */
+
 #define TOKEN_PASTE(x,y) x##y
-#define PREFIXED_SYMBOL(prefix,name) TOKEN_PASTE(prefix,name)
 
 .text
 
-.globl PREFIXED_SYMBOL(SYMBOL_PREFIX,coroutine_transfer)
-PREFIXED_SYMBOL(SYMBOL_PREFIX,coroutine_transfer):
+.globl PREFIXED_SYMBOL(coroutine_transfer)
+PREFIXED_SYMBOL(coroutine_transfer):
+
+#if defined(__CET__) && (__CET__ & 0x01) != 0
+        /* IBT landing pad */
+        endbr64
+#endif
+
+	# Make space on the stack for 6 registers:
+	subq $48, %rsp
 
-	# Save caller state
-	pushq %rbp
-	pushq %rbx
-	pushq %r12
-	pushq %r13
-	pushq %r14
-	pushq %r15
+	# Save caller state:
+	movq %rbp, 40(%rsp)
+	movq %rbx, 32(%rsp)
+	movq %r12, 24(%rsp)
+	movq %r13, 16(%rsp)
+	movq %r14, 8(%rsp)
+	movq %r15, (%rsp)
 
-	# Save caller stack pointer
+	# Save caller stack pointer:
 	movq %rsp, (%rdi)
 
-	# Restore callee stack pointer
+	# Restore callee stack pointer:
 	movq (%rsi), %rsp
 
 	# Restore callee state
-	popq %r15
-	popq %r14
-	popq %r13
-	popq %r12
-	popq %rbx
-	popq %rbp
-
-	# Put the first argument into the return value
+	movq 40(%rsp), %rbp
+	movq 32(%rsp), %rbx
+	movq 24(%rsp), %r12
+	movq 16(%rsp), %r13
+	movq 8(%rsp), %r14
+	movq (%rsp), %r15
+
+	# Adjust stack pointer back:
+	addq $48, %rsp
+
+	# Put the first argument into the return value:
 	movq %rdi, %rax
 
 	# We pop the return address and jump to it
@@ -44,3 +58,31 @@ PREFIXED_SYMBOL(SYMBOL_PREFIX,coroutine_transfer):
 #if (defined(__linux__) || defined(__FreeBSD__)) && defined(__ELF__)
 .section .note.GNU-stack,"",%progbits
 #endif
+
+#if defined(__ELF__)
+
+#if defined(__CET__) && (__CET__ & 0x01) != 0
+# define IBT_FLAG 0x01
+#else
+# define IBT_FLAG 0x00
+#endif
+
+/* We do _NOT_ support CET shadow-stack. Do _not_ add the property for
+ * this to the Context.o object. If you require CET shadow-stack support,
+ * for now, consider building with --with-coroutine=ucontext */
+#define SHSTK_FLAG 0x00
+
+.pushsection .note.gnu.property, "a"
+.p2align 3
+.long 0x4        /* Name size ("GNU\0") */
+.long 0x10       /* Descriptor size */
+.long 0x5        /* Type: NT_GNU_PROPERTY_TYPE_0 */
+.asciz "GNU"     /* Name */
+# Begin descriptor
+.long 0xc0000002 /* Property type: GNU_PROPERTY_X86_FEATURE_1_AND */
+.long 0x4        /* Property size */
+.long (IBT_FLAG | SHSTK_FLAG)
+.long 0x0        /* 8-byte alignment padding */
+/* End descriptor */
+.popsection
+#endif
diff --git a/coroutine/amd64/Context.h b/coroutine/amd64/Context.h
index f626a47225..65aa638304 100644
--- a/coroutine/amd64/Context.h
+++ b/coroutine/amd64/Context.h
@@ -19,10 +19,29 @@
 
 enum {COROUTINE_REGISTERS = 6};
 
+#if defined(__SANITIZE_ADDRESS__)
+    #define COROUTINE_SANITIZE_ADDRESS
+#elif defined(__has_feature)
+    #if __has_feature(address_sanitizer)
+        #define COROUTINE_SANITIZE_ADDRESS
+    #endif
+#endif
+
+#if defined(COROUTINE_SANITIZE_ADDRESS)
+#include <sanitizer/common_interface_defs.h>
+#include <sanitizer/asan_interface.h>
+#endif
+
 struct coroutine_context
 {
     void **stack_pointer;
     void *argument;
+
+#if defined(COROUTINE_SANITIZE_ADDRESS)
+    void *fake_stack;
+    void *stack_base;
+    size_t stack_size;
+#endif
 };
 
 typedef COROUTINE(* coroutine_start)(struct coroutine_context *from, struct coroutine_context *self);
@@ -39,12 +58,18 @@ static inline void coroutine_initialize(
 ) {
     assert(start && stack && size >= 1024);
 
+#if defined(COROUTINE_SANITIZE_ADDRESS)
+    context->fake_stack = NULL;
+    context->stack_base = stack;
+    context->stack_size = size;
+#endif
+
     // Stack grows down. Force 16-byte alignment.
     char * top = (char*)stack + size;
     context->stack_pointer = (void**)((uintptr_t)top & ~0xF);
 
     *--context->stack_pointer = NULL;
-    *--context->stack_pointer = (void*)start;
+    *--context->stack_pointer = (void*)(uintptr_t)start;
 
     context->stack_pointer -= COROUTINE_REGISTERS;
     memset(context->stack_pointer, 0, sizeof(void*) * COROUTINE_REGISTERS);
diff --git a/coroutine/arm32/Context.S b/coroutine/arm32/Context.S
index 1850c4c408..945e4f82d5 100644
--- a/coroutine/arm32/Context.S
+++ b/coroutine/arm32/Context.S
@@ -6,16 +6,15 @@
 ##
 
 #define TOKEN_PASTE(x,y) x##y
-#define PREFIXED_SYMBOL(prefix,name) TOKEN_PASTE(prefix,name)
 
 .file "Context.S"
 .text
-.globl PREFIXED_SYMBOL(SYMBOL_PREFIX,coroutine_transfer)
+.globl PREFIXED_SYMBOL(coroutine_transfer)
 .align 2
-.type PREFIXED_SYMBOL(SYMBOL_PREFIX,coroutine_transfer),%function
+.type PREFIXED_SYMBOL(coroutine_transfer),%function
 .syntax unified
 
-PREFIXED_SYMBOL(SYMBOL_PREFIX,coroutine_transfer):
+PREFIXED_SYMBOL(coroutine_transfer):
 	# Save caller state (8 registers + return address)
 	push {r4-r11,lr}
 
diff --git a/coroutine/arm32/Context.h b/coroutine/arm32/Context.h
index 09410eb25d..7529dd2efc 100644
--- a/coroutine/arm32/Context.h
+++ b/coroutine/arm32/Context.h
@@ -44,7 +44,7 @@ static inline void coroutine_initialize(
     char * top = (char*)stack + size;
     context->stack_pointer = (void**)((uintptr_t)top & ~0xF);
 
-    *--context->stack_pointer = (void*)start;
+    *--context->stack_pointer = (void*)(uintptr_t)start;
 
     context->stack_pointer -= COROUTINE_REGISTERS;
     memset(context->stack_pointer, 0, sizeof(void*) * COROUTINE_REGISTERS);
diff --git a/coroutine/arm64/Context.S b/coroutine/arm64/Context.S
index 07d50d30df..ce219c0c4d 100644
--- a/coroutine/arm64/Context.S
+++ b/coroutine/arm64/Context.S
@@ -6,7 +6,6 @@
 ##
 
 #define TOKEN_PASTE(x,y) x##y
-#define PREFIXED_SYMBOL(prefix,name) TOKEN_PASTE(prefix,name)
 
 #if defined(__APPLE__)
 #define x29 fp
@@ -18,26 +17,63 @@
 .align 2
 #endif
 
-.global PREFIXED_SYMBOL(SYMBOL_PREFIX,coroutine_transfer)
-PREFIXED_SYMBOL(SYMBOL_PREFIX,coroutine_transfer):
+#if defined(__ARM_FEATURE_PAC_DEFAULT) && (__ARM_FEATURE_PAC_DEFAULT & 0x02) != 0
+# error "-mbranch-protection flag specified b-key but Context.S does not support this"
+#endif
+
+#if defined(_WIN32)
+## Add more space for certain TEB values on each stack
+#define TEB_OFFSET 0x20
+#else
+#define TEB_OFFSET 0x00
+#endif
+
+## NOTE(PAC): Use we HINT mnemonics instead of PAC mnemonics to
+## keep compatibility with those assemblers that don't support PAC.
+##
+## See "Providing protection for complex software" for more details about PAC/BTI
+## https://developer.arm.com/architectures/learn-the-architecture/providing-protection-for-complex-software
+
+.global PREFIXED_SYMBOL(coroutine_transfer)
+PREFIXED_SYMBOL(coroutine_transfer):
 
+#if defined(__ARM_FEATURE_PAC_DEFAULT) && (__ARM_FEATURE_PAC_DEFAULT != 0)
+	# paciasp (it also acts as BTI landing pad, so no need to insert BTI also)
+	hint #25
+#elif defined(__ARM_FEATURE_BTI_DEFAULT) && (__ARM_FEATURE_BTI_DEFAULT != 0)
+	# For the case PAC is not enabled but BTI is.
+	# bti c
+	hint #34
+#endif
 	# Make space on the stack for caller registers
-	sub sp, sp, 0xb0
+	sub sp, sp, 0xa0 + TEB_OFFSET
 
 	# Save caller registers
-	stp d8, d9, [sp, 0x00]
-	stp d10, d11, [sp, 0x10]
-	stp d12, d13, [sp, 0x20]
-	stp d14, d15, [sp, 0x30]
-	stp x19, x20, [sp, 0x40]
-	stp x21, x22, [sp, 0x50]
-	stp x23, x24, [sp, 0x60]
-	stp x25, x26, [sp, 0x70]
-	stp x27, x28, [sp, 0x80]
-	stp x29, x30, [sp, 0x90]
-
-	# Save return address
-	str x30, [sp, 0xa0]
+	stp d8, d9, [sp, 0x00 + TEB_OFFSET]
+	stp d10, d11, [sp, 0x10 + TEB_OFFSET]
+	stp d12, d13, [sp, 0x20 + TEB_OFFSET]
+	stp d14, d15, [sp, 0x30 + TEB_OFFSET]
+	stp x19, x20, [sp, 0x40 + TEB_OFFSET]
+	stp x21, x22, [sp, 0x50 + TEB_OFFSET]
+	stp x23, x24, [sp, 0x60 + TEB_OFFSET]
+	stp x25, x26, [sp, 0x70 + TEB_OFFSET]
+	stp x27, x28, [sp, 0x80 + TEB_OFFSET]
+	stp x29, x30, [sp, 0x90 + TEB_OFFSET]
+
+#if defined(_WIN32)
+	# Save certain values from Thread Environment Block (TEB)
+	# x18 points to the TEB on Windows
+	# Read TeStackBase and TeStackLimit at ksarm64.h from TEB
+	ldp  x5,  x6,  [x18, #0x08]
+	# Save them
+	stp  x5,  x6,  [sp, #0x00]
+	# Read TeDeallocationStack at ksarm64.h from TEB
+	ldr  x5, [x18, #0x1478]
+	# Read TeFiberData at ksarm64.h from TEB
+	ldr  x6, [x18, #0x20]
+	# Save current fiber data and deallocation stack
+	stp  x5,  x6,  [sp, #0x10]
+#endif
 
 	# Save stack pointer to x0 (first argument)
 	mov x2, sp
@@ -47,27 +83,78 @@ PREFIXED_SYMBOL(SYMBOL_PREFIX,coroutine_transfer):
 	ldr x3, [x1, 0]
 	mov sp, x3
 
+#if defined(_WIN32)
+	# Restore stack base and limit
+	ldp  x5,  x6,  [sp, #0x00]
+	# Write TeStackBase and TeStackLimit at ksarm64.h to TEB
+	stp  x5,  x6,  [x18, #0x08]
+	# Restore fiber data and deallocation stack
+	ldp  x5,  x6,  [sp, #0x10]
+	# Write TeDeallocationStack at ksarm64.h to TEB
+	str  x5, [x18, #0x1478]
+	# Write TeFiberData at ksarm64.h to TEB
+	str  x6, [x18, #0x20]
+#endif
+
 	# Restore caller registers
-	ldp d8, d9, [sp, 0x00]
-	ldp d10, d11, [sp, 0x10]
-	ldp d12, d13, [sp, 0x20]
-	ldp d14, d15, [sp, 0x30]
-	ldp x19, x20, [sp, 0x40]
-	ldp x21, x22, [sp, 0x50]
-	ldp x23, x24, [sp, 0x60]
-	ldp x25, x26, [sp, 0x70]
-	ldp x27, x28, [sp, 0x80]
-	ldp x29, x30, [sp, 0x90]
-
-	# Load return address into x4
-	ldr x4, [sp, 0xa0]
+	ldp d8, d9, [sp, 0x00 + TEB_OFFSET]
+	ldp d10, d11, [sp, 0x10 + TEB_OFFSET]
+	ldp d12, d13, [sp, 0x20 + TEB_OFFSET]
+	ldp d14, d15, [sp, 0x30 + TEB_OFFSET]
+	ldp x19, x20, [sp, 0x40 + TEB_OFFSET]
+	ldp x21, x22, [sp, 0x50 + TEB_OFFSET]
+	ldp x23, x24, [sp, 0x60 + TEB_OFFSET]
+	ldp x25, x26, [sp, 0x70 + TEB_OFFSET]
+	ldp x27, x28, [sp, 0x80 + TEB_OFFSET]
+	ldp x29, x30, [sp, 0x90 + TEB_OFFSET]
 
 	# Pop stack frame
-	add sp, sp, 0xb0
+	add sp, sp, 0xa0 + TEB_OFFSET
 
-	# Jump to return address (in x4)
-	ret x4
+#if defined(__ARM_FEATURE_PAC_DEFAULT) && (__ARM_FEATURE_PAC_DEFAULT != 0)
+	# autiasp: Authenticate x30 (LR) with SP and key A
+	hint #29
+#endif
+
+	# Jump to return address (in x30)
+	ret
 
 #if defined(__linux__) && defined(__ELF__)
 .section .note.GNU-stack,"",%progbits
 #endif
+
+#if (defined(__ARM_FEATURE_BTI_DEFAULT) && __ARM_FEATURE_BTI_DEFAULT != 0) || (defined(__ARM_FEATURE_PAC_DEFAULT) && __ARM_FEATURE_PAC_DEFAULT != 0)
+#if defined(__ELF__)
+/*  See "ELF for the Arm 64-bit Architecture (AArch64)"
+    https://github.com/ARM-software/abi-aa/blob/2023Q3/aaelf64/aaelf64.rst#program-property */
+#  define GNU_PROPERTY_AARCH64_FEATURE_1_BTI (1<<0)
+#  define GNU_PROPERTY_AARCH64_FEATURE_1_PAC (1<<1)
+
+#  if defined(__ARM_FEATURE_BTI_DEFAULT) && __ARM_FEATURE_BTI_DEFAULT != 0
+#    define BTI_FLAG GNU_PROPERTY_AARCH64_FEATURE_1_BTI
+#  else
+#    define BTI_FLAG 0
+#  endif
+#  if defined(__ARM_FEATURE_PAC_DEFAULT) && __ARM_FEATURE_PAC_DEFAULT != 0
+#    define PAC_FLAG GNU_PROPERTY_AARCH64_FEATURE_1_PAC
+#  else
+#    define PAC_FLAG 0
+#  endif
+
+  # The note section format is described by Note Section in Chapter 5
+  # of "System V Application Binary Interface, Edition 4.1".
+  .pushsection .note.gnu.property, "a"
+  .p2align 3
+  .long 0x4        /* Name size ("GNU\0") */
+  .long 0x10       /* Descriptor size */
+  .long 0x5        /* Type: NT_GNU_PROPERTY_TYPE_0 */
+  .asciz "GNU"     /* Name */
+  # Begin descriptor
+  .long 0xc0000000 /* Property type: GNU_PROPERTY_AARCH64_FEATURE_1_AND */
+  .long 0x4        /* Property size */
+  .long (BTI_FLAG|PAC_FLAG)
+  .long 0x0        /* 8-byte alignment padding */
+  # End descriptor
+  .popsection
+#endif
+#endif
diff --git a/coroutine/arm64/Context.asm b/coroutine/arm64/Context.asm
new file mode 100644
index 0000000000..866fa628e7
--- /dev/null
+++ b/coroutine/arm64/Context.asm
@@ -0,0 +1,81 @@
+	TTL	coroutine/arm64/Context.asm
+
+	AREA	|.drectve|, DRECTVE
+
+	EXPORT	|coroutine_transfer|
+
+	AREA	|.text$mn|, CODE, ARM64
+
+;; Add more space for certain TEB values on each stack
+TEB_OFFSET EQU 0x20
+
+;; Incomplete implementation
+coroutine_transfer PROC
+	; Make space on the stack for caller registers
+	sub sp, sp, 0xa0 + TEB_OFFSET
+
+	; Save caller registers
+	stp d8, d9, [sp, 0x00 + TEB_OFFSET]
+	stp d10, d11, [sp, 0x10 + TEB_OFFSET]
+	stp d12, d13, [sp, 0x20 + TEB_OFFSET]
+	stp d14, d15, [sp, 0x30 + TEB_OFFSET]
+	stp x19, x20, [sp, 0x40 + TEB_OFFSET]
+	stp x21, x22, [sp, 0x50 + TEB_OFFSET]
+	stp x23, x24, [sp, 0x60 + TEB_OFFSET]
+	stp x25, x26, [sp, 0x70 + TEB_OFFSET]
+	stp x27, x28, [sp, 0x80 + TEB_OFFSET]
+	stp x29, x30, [sp, 0x90 + TEB_OFFSET]
+
+	;; Save certain values from Thread Environment Block (TEB) x18
+	;; points to the TEB on Windows
+	;; Read TeStackBase and TeStackLimit at ksarm64.h from TEB
+	ldp  x5,  x6,  [x18, #0x08]
+	;; Save them
+	stp  x5,  x6,  [sp, #0x00]
+	;; Read TeDeallocationStack at ksarm64.h from TEB
+	ldr  x5, [x18, #0x1478]
+	;; Read TeFiberData at ksarm64.h from TEB
+	ldr  x6, [x18, #0x20]
+	;; Save current fiber data and deallocation stack
+	stp  x5,  x6,  [sp, #0x10]
+
+	; Save stack pointer to x0 (first argument)
+	mov x2, sp
+	str x2, [x0, 0]
+
+	; Load stack pointer from x1 (second argument)
+	ldr x3, [x1, 0]
+	mov sp, x3
+
+	;; Restore stack base and limit
+	ldp  x5,  x6,  [sp, #0x00]
+	;; Write TeStackBase and TeStackLimit at ksarm64.h to TEB
+	stp  x5,  x6,  [x18, #0x08]
+	;; Restore fiber data and deallocation stack
+	ldp  x5,  x6,  [sp, #0x10]
+	;; Write TeDeallocationStack at ksarm64.h to TEB
+	str  x5, [x18, #0x1478]
+	;; Write TeFiberData at ksarm64.h to TEB
+	str  x6, [x18, #0x20]
+
+	; Restore caller registers
+	ldp d8, d9, [sp, 0x00 + TEB_OFFSET]
+	ldp d10, d11, [sp, 0x10 + TEB_OFFSET]
+	ldp d12, d13, [sp, 0x20 + TEB_OFFSET]
+	ldp d14, d15, [sp, 0x30 + TEB_OFFSET]
+	ldp x19, x20, [sp, 0x40 + TEB_OFFSET]
+	ldp x21, x22, [sp, 0x50 + TEB_OFFSET]
+	ldp x23, x24, [sp, 0x60 + TEB_OFFSET]
+	ldp x25, x26, [sp, 0x70 + TEB_OFFSET]
+	ldp x27, x28, [sp, 0x80 + TEB_OFFSET]
+	ldp x29, x30, [sp, 0x90 + TEB_OFFSET]
+
+	; Pop stack frame
+	add sp, sp, 0xa0 + TEB_OFFSET
+
+	; Jump to return address (in x30)
+	ret
+
+	endp
+
+	end
diff --git a/coroutine/arm64/Context.h b/coroutine/arm64/Context.h
index dbc6ac94fb..468e4155b2 100644
--- a/coroutine/arm64/Context.h
+++ b/coroutine/arm64/Context.h
@@ -15,22 +15,67 @@
 #include <stdint.h>
 #include <string.h>
 
+#if defined __GNUC__
 #define COROUTINE __attribute__((noreturn)) void
+#define COROUTINE_DECL COROUTINE
+#elif defined _MSC_VER
+#define COROUTINE __declspec(noreturn) void
+#define COROUTINE_DECL void
+#endif
 
-enum {COROUTINE_REGISTERS = 0xb0 / 8};
+#if defined(_WIN32)
+#define TEB_OFFSET 0x20
+#else
+#define TEB_OFFSET 0x00
+#endif
+
+enum {COROUTINE_REGISTERS = (0xa0 + TEB_OFFSET) / 8};
+
+#if defined(__SANITIZE_ADDRESS__)
+    #define COROUTINE_SANITIZE_ADDRESS
+#elif defined(__has_feature)
+    #if __has_feature(address_sanitizer)
+        #define COROUTINE_SANITIZE_ADDRESS
+    #endif
+#endif
+
+#if defined(COROUTINE_SANITIZE_ADDRESS)
+#include <sanitizer/common_interface_defs.h>
+#include <sanitizer/asan_interface.h>
+#endif
 
 struct coroutine_context
 {
     void **stack_pointer;
     void *argument;
+
+#if defined(COROUTINE_SANITIZE_ADDRESS)
+    void *fake_stack;
+    void *stack_base;
+    size_t stack_size;
+#endif
 };
 
-typedef COROUTINE(* coroutine_start)(struct coroutine_context *from, struct coroutine_context *self);
+typedef COROUTINE_DECL(* coroutine_start)(struct coroutine_context *from, struct coroutine_context *self);
 
 static inline void coroutine_initialize_main(struct coroutine_context * context) {
     context->stack_pointer = NULL;
 }
 
+static inline void *ptrauth_sign_instruction_addr(void *addr, void *modifier) {
+#if defined(__ARM_FEATURE_PAC_DEFAULT) && __ARM_FEATURE_PAC_DEFAULT != 0
+    // Sign the given instruction address with the given modifier and key A
+    register void *r17 __asm("r17") = addr;
+    register void *r16 __asm("r16") = modifier;
+    // Use HINT mnemonic instead of PACIA1716 for compatibility with older assemblers.
+    __asm ("hint #8;" : "+r"(r17) : "r"(r16));
+    addr = r17;
+#else
+    // No-op if PAC is not enabled
+#endif
+    return addr;
+}
+
 static inline void coroutine_initialize(
     struct coroutine_context *context,
     coroutine_start start,
@@ -39,14 +84,29 @@ static inline void coroutine_initialize(
 ) {
     assert(start && stack && size >= 1024);
 
+#if defined(COROUTINE_SANITIZE_ADDRESS)
+    context->fake_stack = NULL;
+    context->stack_base = stack;
+    context->stack_size = size;
+#endif
+
     // Stack grows down. Force 16-byte alignment.
     char * top = (char*)stack + size;
-    context->stack_pointer = (void**)((uintptr_t)top & ~0xF);
+    top = (char *)((uintptr_t)top & ~0xF);
+    context->stack_pointer = (void**)top;
 
     context->stack_pointer -= COROUTINE_REGISTERS;
     memset(context->stack_pointer, 0, sizeof(void*) * COROUTINE_REGISTERS);
 
-    context->stack_pointer[0xa0 / 8] = (void*)start;
+    void *addr = (void*)(uintptr_t)start;
+    context->stack_pointer[(0x98 + TEB_OFFSET) / 8] = ptrauth_sign_instruction_addr(addr, (void*)top);
+#if defined(_WIN32)
+    // save top address of stack as base in TEB
+    context->stack_pointer[0x00 / 8] = (char*)stack + size;
+    // save botton address of stack as limit and deallocation stack in TEB
+    context->stack_pointer[0x08 / 8] = stack;
+    context->stack_pointer[0x10 / 8] = stack;
+#endif
 }
 
 struct coroutine_context * coroutine_transfer(struct coroutine_context * current, struct coroutine_context * target);
diff --git a/coroutine/asyncify/Context.h b/coroutine/asyncify/Context.h
index 7dba829a1d..71791a4004 100644
--- a/coroutine/asyncify/Context.h
+++ b/coroutine/asyncify/Context.h
@@ -13,6 +13,7 @@
 
 #include <stddef.h>
 #include <stdio.h>
+#include <stdint.h>
 #include "wasm/asyncify.h"
 #include "wasm/machine.h"
 #include "wasm/fiber.h"
@@ -47,10 +48,13 @@ static inline void coroutine_initialize_main(struct coroutine_context * context)
 
 static inline void coroutine_initialize(struct coroutine_context *context, coroutine_start start, void *stack, size_t size)
 {
-    if (ASYNCIFY_CORO_DEBUG) fprintf(stderr, "[%s] entry (context = %p, stack = %p ... %p)\n", __func__, context, stack, (char *)stack + size);
+    // Linear stack pointer must be always aligned down to 16 bytes.
+    // https://github.com/WebAssembly/tool-conventions/blob/c74267a5897c1bdc9aa60adeaf41816387d3cd12/BasicCABI.md#the-linear-stack
+    uintptr_t sp = ((uintptr_t)stack + size) & ~0xF;
+    if (ASYNCIFY_CORO_DEBUG) fprintf(stderr, "[%s] entry (context = %p, stack = %p ... %p)\n", __func__, context, stack, (char *)sp);
     rb_wasm_init_context(&context->fc, coroutine_trampoline, start, context);
     // record the initial stack pointer position to restore it after resumption
-    context->current_sp = (char *)stack + size;
+    context->current_sp = (char *)sp;
     context->stack_base = stack;
     context->size = size;
 }
diff --git a/coroutine/loongarch64/Context.S b/coroutine/loongarch64/Context.S
new file mode 100644
index 0000000000..6e10cd032b
--- /dev/null
+++ b/coroutine/loongarch64/Context.S
@@ -0,0 +1,72 @@
+#define TOKEN_PASTE(x,y) x##y
+
+.text
+.align 2
+
+.global PREFIXED_SYMBOL(coroutine_transfer)
+PREFIXED_SYMBOL(coroutine_transfer):
+
+	# Make space on the stack for caller registers
+	addi.d $sp, $sp, -0xa0
+
+	# Save caller registers
+	st.d $s0, $sp, 0x00
+	st.d $s1, $sp, 0x08
+	st.d $s2, $sp, 0x10
+	st.d $s3, $sp, 0x18
+	st.d $s4, $sp, 0x20
+	st.d $s5, $sp, 0x28
+	st.d $s6, $sp, 0x30
+	st.d $s7, $sp, 0x38
+	st.d $s8, $sp, 0x40
+	st.d $fp, $sp, 0x48
+	fst.d $fs0, $sp, 0x50
+	fst.d $fs1, $sp, 0x58
+	fst.d $fs2, $sp, 0x60
+	fst.d $fs3, $sp, 0x68
+	fst.d $fs4, $sp, 0x70
+	fst.d $fs5, $sp, 0x78
+	fst.d $fs6, $sp, 0x80
+	fst.d $fs7, $sp, 0x88
+
+	# Save return address
+	st.d $ra, $sp, 0x90
+
+	# Save stack pointer to a0 (first argument)
+	st.d $sp, $a0, 0x00
+
+	# Load stack pointer from a1 (second argument)
+	ld.d $sp, $a1, 0x00
+
+	# Restore caller registers
+	ld.d $s0, $sp, 0x00
+	ld.d $s1, $sp, 0x08
+	ld.d $s2, $sp, 0x10
+	ld.d $s3, $sp, 0x18
+	ld.d $s4, $sp, 0x20
+	ld.d $s5, $sp, 0x28
+	ld.d $s6, $sp, 0x30
+	ld.d $s7, $sp, 0x38
+	ld.d $s8, $sp, 0x40
+	ld.d $fp, $sp, 0x48
+	fld.d $fs0, $sp, 0x50
+	fld.d $fs1, $sp, 0x58
+	fld.d $fs2, $sp, 0x60
+	fld.d $fs3, $sp, 0x68
+	fld.d $fs4, $sp, 0x70
+	fld.d $fs5, $sp, 0x78
+	fld.d $fs6, $sp, 0x80
+	fld.d $fs7, $sp, 0x88
+
+	# Load return address
+	ld.d $ra, $sp, 0x90
+
+	# Pop stack frame
+	addi.d $sp, $sp, 0xa0	
+
+	# Jump to return address
+	jr $ra
+
+#if defined(__linux__) && defined(__ELF__)
+.section .note.GNU-stack,"",%progbits
+#endif
diff --git a/coroutine/loongarch64/Context.h b/coroutine/loongarch64/Context.h
new file mode 100644
index 0000000000..82b85b36e9
--- /dev/null
+++ b/coroutine/loongarch64/Context.h
@@ -0,0 +1,46 @@
+#pragma once
+
+#include <assert.h>
+#include <stddef.h>
+#include <stdint.h>
+#include <string.h>
+
+#define COROUTINE __attribute__((noreturn)) void
+
+enum {COROUTINE_REGISTERS = 0xa0 / 8};
+
+struct coroutine_context
+{
+    void **stack_pointer;
+    void *argument;
+};
+
+typedef COROUTINE(* coroutine_start)(struct coroutine_context *from, struct coroutine_context *self);
+
+static inline void coroutine_initialize_main(struct coroutine_context * context) {
+    context->stack_pointer = NULL;
+}
+
+static inline void coroutine_initialize(
+    struct coroutine_context *context,
+    coroutine_start start,
+    void *stack,
+    size_t size
+) {
+    assert(start && stack && size >= 1024);
+
+    // Stack grows down. Force 16-byte alignment.
+    char * top = (char*)stack + size;
+    context->stack_pointer = (void**)((uintptr_t)top & ~0xF);
+
+    context->stack_pointer -= COROUTINE_REGISTERS;
+    memset(context->stack_pointer, 0, sizeof(void*) * COROUTINE_REGISTERS);
+
+    context->stack_pointer[0x90 / 8] = (void*)(uintptr_t)start;
+}
+
+struct coroutine_context * coroutine_transfer(struct coroutine_context * current, struct coroutine_context * target);
+
+static inline void coroutine_destroy(struct coroutine_context * context)
+{
+}
diff --git a/coroutine/ppc/Context.S b/coroutine/ppc/Context.S
new file mode 100644
index 0000000000..f44b2419b4
--- /dev/null
+++ b/coroutine/ppc/Context.S
@@ -0,0 +1,89 @@
+; Based on the code by Samuel Williams. Created by Sergey Fedorov on 04/06/2022.
+; Credits to Samuel Williams, Rei Odaira and Iain Sandoe. Errors, if any, are mine.
+; Some relevant examples: https://github.com/gcc-mirror/gcc/blob/master/libphobos/libdruntime/config/powerpc/switchcontext.S
+; https://github.com/gcc-mirror/gcc/blob/master/libgcc/config/rs6000/darwin-gpsave.S
+; https://www.ibm.com/docs/en/aix/7.2?topic=epilogs-saving-gprs-only
+; ppc32 version may be re-written compactly with stmw/lwm, but the code won't be faster, see: https://github.com/ruby/ruby/pull/5927#issuecomment-1139730541
+
+; Notice that this code is only for Darwin (macOS). Darwin ABI differs from AIX and ELF.
+; To add support for AIX, *BSD or *Linux, please make separate implementations.
+
+#define TOKEN_PASTE(x,y) x##y
+
+.machine ppc7400 ; = G4, Rosetta
+.text
+
+.globl PREFIXED_SYMBOL(coroutine_transfer)
+.align 2
+
+PREFIXED_SYMBOL(coroutine_transfer):
+	; Make space on the stack for caller registers
+	; (Should we rather use red zone? See libphobos example.)
+	subi r1,r1,80
+
+	; Get LR
+	mflr r0
+
+	; Save caller registers
+	stw r31,0(r1)
+	stw r30,4(r1)
+	stw r29,8(r1)
+	stw r28,12(r1)
+	stw r27,16(r1)
+	stw r26,20(r1)
+	stw r25,24(r1)
+	stw r24,28(r1)
+	stw r23,32(r1)
+	stw r22,36(r1)
+	stw r21,40(r1)
+	stw r20,44(r1)
+	stw r19,48(r1)
+	stw r18,52(r1)
+	stw r17,56(r1)
+	stw r16,60(r1)
+	stw r15,64(r1)
+	stw r14,68(r1)
+	stw r13,72(r1)
+
+	; Save return address
+	; Possibly should rather be saved into linkage area, see libphobos and IBM docs
+	stw r0,76(r1)
+
+	; Save stack pointer to first argument
+	stw r1,0(r3)
+
+	; Load stack pointer from second argument
+	lwz r1,0(r4)
+
+	; Load return address
+	lwz r0,76(r1)
+
+	; Restore caller registers
+	lwz r13,72(r1)
+	lwz r14,68(r1)
+	lwz r15,64(r1)
+	lwz r16,60(r1)
+	lwz r17,56(r1)
+	lwz r18,52(r1)
+	lwz r19,48(r1)
+	lwz r20,44(r1)
+	lwz r21,40(r1)
+	lwz r22,36(r1)
+	lwz r23,32(r1)
+	lwz r24,28(r1)
+	lwz r25,24(r1)
+	lwz r26,20(r1)
+	lwz r27,16(r1)
+	lwz r28,12(r1)
+	lwz r29,8(r1)
+	lwz r30,4(r1)
+	lwz r31,0(r1)
+
+	; Set LR
+	mtlr r0
+
+	; Pop stack frame
+	addi r1,r1,80
+
+	; Jump to return address
+	blr
diff --git a/coroutine/ppc/Context.h b/coroutine/ppc/Context.h
new file mode 100644
index 0000000000..8035d08556
--- /dev/null
+++ b/coroutine/ppc/Context.h
@@ -0,0 +1,58 @@
+#ifndef COROUTINE_PPC_CONTEXT_H
+#define COROUTINE_PPC_CONTEXT_H 1
+
+#pragma once
+
+#include <assert.h>
+#include <stddef.h>
+#include <stdint.h>
+#include <string.h>
+
+#define COROUTINE __attribute__((noreturn)) void
+#define COROUTINE_LIMITED_ADDRESS_SPACE
+
+enum {
+  COROUTINE_REGISTERS =
+  20  /* 19 general purpose registers (r13-r31) and 1 return address */
+  + 4  /* space for fiber_entry() to store the link register */
+};
+
+struct coroutine_context
+{
+    void **stack_pointer;
+    void *argument;
+};
+
+typedef COROUTINE(* coroutine_start)(struct coroutine_context *from, struct coroutine_context *self);
+
+static inline void coroutine_initialize_main(struct coroutine_context * context) {
+    context->stack_pointer = NULL;
+}
+
+static inline void coroutine_initialize(
+    struct coroutine_context *context,
+    coroutine_start start,
+    void *stack,
+    size_t size
+) {
+    assert(start && stack && size >= 1024);
+
+    // Stack grows down. Force 16-byte alignment.
+    char * top = (char*)stack + size;
+    context->stack_pointer = (void**)((uintptr_t)top & ~0xF);
+
+    context->stack_pointer -= COROUTINE_REGISTERS;
+    memset(context->stack_pointer, 0, sizeof(void*) * COROUTINE_REGISTERS);
+
+    /* Skip a global prologue that sets the TOC register */
+    context->stack_pointer[19] = ((char*)start) + 8;
+}
+
+struct coroutine_context * coroutine_transfer(struct coroutine_context * current, struct coroutine_context * target);
+
+static inline void coroutine_destroy(struct coroutine_context * context)
+{
+    context->stack_pointer = NULL;
+}
+
+#endif /* COROUTINE_PPC_CONTEXT_H */
diff --git a/coroutine/ppc64/Context.S b/coroutine/ppc64/Context.S
new file mode 100644
index 0000000000..20a47c61c6
--- /dev/null
+++ b/coroutine/ppc64/Context.S
@@ -0,0 +1,88 @@
+; Based on the code by Samuel Williams. Created by Sergey Fedorov on 04/06/2022.
+; Credits to Samuel Williams, Rei Odaira and Iain Sandoe. Errors, if any, are mine.
+; Some relevant examples: https://github.com/gcc-mirror/gcc/blob/master/libphobos/libdruntime/config/powerpc/switchcontext.S
+; https://github.com/gcc-mirror/gcc/blob/master/libgcc/config/rs6000/darwin-gpsave.S
+; https://www.ibm.com/docs/en/aix/7.2?topic=epilogs-saving-gprs-only
+
+; Notice that this code is only for Darwin (macOS). Darwin ABI differs from AIX and ELF.
+; To add support for AIX, *BSD or *Linux, please make separate implementations.
+
+#define TOKEN_PASTE(x,y) x##y
+
+.machine ppc64 ; = G5
+.text
+
+.globl PREFIXED_SYMBOL(coroutine_transfer)
+.align 2
+
+PREFIXED_SYMBOL(coroutine_transfer):
+	; Make space on the stack for caller registers
+	; (Should we rather use red zone? See libphobos example.)
+	subi r1,r1,160
+
+	; Get LR
+	mflr r0
+
+	; Save caller registers
+	std r31,0(r1)
+	std r30,8(r1)
+	std r29,16(r1)
+	std r28,24(r1)
+	std r27,32(r1)
+	std r26,40(r1)
+	std r25,48(r1)
+	std r24,56(r1)
+	std r23,64(r1)
+	std r22,72(r1)
+	std r21,80(r1)
+	std r20,88(r1)
+	std r19,96(r1)
+	std r18,104(r1)
+	std r17,112(r1)
+	std r16,120(r1)
+	std r15,128(r1)
+	std r14,136(r1)
+	std r13,144(r1)
+
+	; Save return address
+	; Possibly should rather be saved into linkage area, see libphobos and IBM docs
+	std r0,152(r1)
+
+	; Save stack pointer to first argument
+	std r1,0(r3)
+
+	; Load stack pointer from second argument
+	ld r1,0(r4)
+
+	; Load return address
+	ld r0,152(r1)
+
+	; Restore caller registers
+	ld r13,144(r1)
+	ld r14,136(r1)
+	ld r15,128(r1)
+	ld r16,120(r1)
+	ld r17,112(r1)
+	ld r18,104(r1)
+	ld r19,96(r1)
+	ld r20,88(r1)
+	ld r21,80(r1)
+	ld r22,72(r1)
+	ld r23,64(r1)
+	ld r24,56(r1)
+	ld r25,48(r1)
+	ld r26,40(r1)
+	ld r27,32(r1)
+	ld r28,24(r1)
+	ld r29,16(r1)
+	ld r30,8(r1)
+	ld r31,0(r1)
+
+	; Set LR
+	mtlr r0
+
+	; Pop stack frame
+	addi r1,r1,160
+
+	; Jump to return address
+	blr
diff --git a/coroutine/ppc64/Context.h b/coroutine/ppc64/Context.h
new file mode 100644
index 0000000000..085b475ed5
--- /dev/null
+++ b/coroutine/ppc64/Context.h
@@ -0,0 +1,57 @@
+#ifndef COROUTINE_PPC64_CONTEXT_H
+#define COROUTINE_PPC64_CONTEXT_H 1
+
+#pragma once
+
+#include <assert.h>
+#include <stddef.h>
+#include <stdint.h>
+#include <string.h>
+
+#define COROUTINE __attribute__((noreturn)) void
+
+enum {
+  COROUTINE_REGISTERS =
+  20  /* 19 general purpose registers (r13-r31) and 1 return address */
+  + 4  /* space for fiber_entry() to store the link register */
+};
+
+struct coroutine_context
+{
+    void **stack_pointer;
+    void *argument;
+};
+
+typedef COROUTINE(* coroutine_start)(struct coroutine_context *from, struct coroutine_context *self);
+
+static inline void coroutine_initialize_main(struct coroutine_context * context) {
+    context->stack_pointer = NULL;
+}
+
+static inline void coroutine_initialize(
+    struct coroutine_context *context,
+    coroutine_start start,
+    void *stack,
+    size_t size
+) {
+    assert(start && stack && size >= 1024);
+
+    // Stack grows down. Force 16-byte alignment.
+    char * top = (char*)stack + size;
+    context->stack_pointer = (void**)((uintptr_t)top & ~0xF);
+
+    context->stack_pointer -= COROUTINE_REGISTERS;
+    memset(context->stack_pointer, 0, sizeof(void*) * COROUTINE_REGISTERS);
+
+    /* Skip a global prologue that sets the TOC register */
+    context->stack_pointer[19] = ((char*)start) + 8;
+}
+
+struct coroutine_context * coroutine_transfer(struct coroutine_context * current, struct coroutine_context * target);
+
+static inline void coroutine_destroy(struct coroutine_context * context)
+{
+    context->stack_pointer = NULL;
+}
+
+#endif /* COROUTINE_PPC64_CONTEXT_H */
diff --git a/coroutine/ppc64le/Context.S b/coroutine/ppc64le/Context.S
index 61be9efcf0..f7bcae2c3a 100644
--- a/coroutine/ppc64le/Context.S
+++ b/coroutine/ppc64le/Context.S
@@ -1,14 +1,13 @@
 #define TOKEN_PASTE(x,y) x##y
-#define PREFIXED_SYMBOL(prefix,name) TOKEN_PASTE(prefix,name)
 
 .text
 .align 2
 
-.globl PREFIXED_SYMBOL(SYMBOL_PREFIX,coroutine_transfer)
-.type   PREFIXED_SYMBOL(SYMBOL_PREFIX,coroutine_transfer), @function
-PREFIXED_SYMBOL(SYMBOL_PREFIX,coroutine_transfer):
+.globl PREFIXED_SYMBOL(coroutine_transfer)
+.type   PREFIXED_SYMBOL(coroutine_transfer), @function
+PREFIXED_SYMBOL(coroutine_transfer):
 	# Make space on the stack for caller registers
-	addi 1,1,-152
+	addi 1,1,-160
 
 	# Save caller registers
 	std 14,0(1)
@@ -34,6 +33,10 @@ PREFIXED_SYMBOL(SYMBOL_PREFIX,coroutine_transfer):
 	mflr 0
 	std 0,144(1)
 
+        # Save caller special register
+        mfcr 0
+        std 0, 152(1)
+
 	# Save stack pointer to first argument
 	std 1,0(3)
 
@@ -64,8 +67,14 @@ PREFIXED_SYMBOL(SYMBOL_PREFIX,coroutine_transfer):
 	ld 0,144(1)
 	mtlr 0
 
+        # Load special registers
+        ld 0,152(1)
+        # Restore cr register cr2, cr3 and cr4 (field index 3,4,5)
+        # (field index is 1-based, field 1 = cr0) using a mask (32|16|8 = 56)
+        mtcrf 56,0
+
 	# Pop stack frame
-	addi 1,1,152
+	addi 1,1,160
 
 	# Jump to return address
 	blr
diff --git a/coroutine/ppc64le/Context.h b/coroutine/ppc64le/Context.h
index fbfaa2ee63..63ea9f19ff 100644
--- a/coroutine/ppc64le/Context.h
+++ b/coroutine/ppc64le/Context.h
@@ -12,7 +12,7 @@
 
 enum {
   COROUTINE_REGISTERS =
-  19  /* 18 general purpose registers (r14-r31) and 1 return address */
+  20  /* 18 general purpose registers (r14-r31), 1 special register (cr) and 1 return address */
   + 4  /* space for fiber_entry() to store the link register */
 };
 
diff --git a/coroutine/riscv64/Context.S b/coroutine/riscv64/Context.S
index cc4e872f84..8e7fc74ffc 100644
--- a/coroutine/riscv64/Context.S
+++ b/coroutine/riscv64/Context.S
@@ -1,11 +1,10 @@
 #define TOKEN_PASTE(x,y) x##y
-#define PREFIXED_SYMBOL(prefix,name) TOKEN_PASTE(prefix,name)
 
 .text
 .align 2
 
-.global PREFIXED_SYMBOL(SYMBOL_PREFIX,coroutine_transfer)
-PREFIXED_SYMBOL(SYMBOL_PREFIX,coroutine_transfer):
+.global PREFIXED_SYMBOL(coroutine_transfer)
+PREFIXED_SYMBOL(coroutine_transfer):
 
 	# Make space on the stack for caller registers
 	addi sp, sp, -0xd0
diff --git a/coroutine/riscv64/Context.h b/coroutine/riscv64/Context.h
index 9ce1140e0b..3660fb5577 100644
--- a/coroutine/riscv64/Context.h
+++ b/coroutine/riscv64/Context.h
@@ -36,7 +36,7 @@ static inline void coroutine_initialize(
     context->stack_pointer -= COROUTINE_REGISTERS;
     memset(context->stack_pointer, 0, sizeof(void*) * COROUTINE_REGISTERS);
 
-    context->stack_pointer[0xc0 / 8] = (void*)start;
+    context->stack_pointer[0xc0 / 8] = (void*)(uintptr_t)start;
 }
 
 struct coroutine_context * coroutine_transfer(struct coroutine_context * current, struct coroutine_context * target);
diff --git a/coroutine/universal/Context.S b/coroutine/universal/Context.S
index 0fd8c01e7f..11c80a7927 100644
--- a/coroutine/universal/Context.S
+++ b/coroutine/universal/Context.S
@@ -3,7 +3,11 @@
 # include "coroutine/amd64/Context.S"
 #elif defined __i386__
 # include "coroutine/x86/Context.S"
-#elif defined __ppc64__
+#elif defined __ppc__
+# include "coroutine/ppc/Context.S"
+#elif defined __ppc64__ && defined(WORDS_BIGENDIAN)
+# include "coroutine/ppc64/Context.S"
+#elif defined __ppc64__ && !defined(WORDS_BIGENDIAN)
 # include "coroutine/ppc64le/Context.S"
 #elif defined __arm64__
 # include "coroutine/arm64/Context.S"
diff --git a/coroutine/universal/Context.h b/coroutine/universal/Context.h
index 9a2ef425db..ec4d2f484a 100644
--- a/coroutine/universal/Context.h
+++ b/coroutine/universal/Context.h
@@ -6,7 +6,11 @@
 # include "coroutine/amd64/Context.h"
 #elif defined __i386__
 # include "coroutine/x86/Context.h"
-#elif defined __ppc64__
+#elif defined __ppc__
+# include "coroutine/ppc/Context.h"
+#elif defined __ppc64__ && defined(WORDS_BIGENDIAN)
+# include "coroutine/ppc64/Context.h"
+#elif defined __ppc64__ && !defined(WORDS_BIGENDIAN)
 # include "coroutine/ppc64le/Context.h"
 #elif defined __arm64__
 # include "coroutine/arm64/Context.h"
diff --git a/coroutine/win32/Context.h b/coroutine/win32/Context.h
index 902fd1246f..c1c8fbcd13 100644
--- a/coroutine/win32/Context.h
+++ b/coroutine/win32/Context.h
@@ -16,6 +16,7 @@
 #include <string.h>
 
 #define COROUTINE __declspec(noreturn) void __fastcall
+#define COROUTINE_DECL void __fastcall
 #define COROUTINE_LIMITED_ADDRESS_SPACE
 
 /* This doesn't include thread information block */
@@ -45,7 +46,7 @@ static inline void coroutine_initialize(
     char * top = (char*)stack + size;
     context->stack_pointer = (void**)((uintptr_t)top & ~0xF);
 
-    *--context->stack_pointer = (void*)start;
+    *--context->stack_pointer = (void*)(uintptr_t)start;
 
     /* Windows Thread Information Block */
     *--context->stack_pointer = (void*)0xFFFFFFFF; /* fs:[0] */
diff --git a/coroutine/win64/Context.h b/coroutine/win64/Context.h
index aaa4caeaf9..23b21b5c1c 100644
--- a/coroutine/win64/Context.h
+++ b/coroutine/win64/Context.h
@@ -16,6 +16,7 @@
 #include <string.h>
 
 #define COROUTINE __declspec(noreturn) void
+#define COROUTINE_DECL void
 
 enum {
     COROUTINE_REGISTERS = 8,
@@ -30,7 +31,7 @@ struct coroutine_context
 
 typedef void(* coroutine_start)(struct coroutine_context *from, struct coroutine_context *self);
 
-void coroutine_trampoline();
+void coroutine_trampoline(void);
 
 static inline void coroutine_initialize_main(struct coroutine_context * context) {
     context->stack_pointer = NULL;
@@ -53,7 +54,7 @@ static inline void coroutine_initialize(
 
     /* Return address */
     *--context->stack_pointer = 0;
-    *--context->stack_pointer = (void*)start;
+    *--context->stack_pointer = (void*)(uintptr_t)start;
     *--context->stack_pointer = (void*)coroutine_trampoline;
 
     /* Windows Thread Information Block */
diff --git a/coroutine/x86/Context.S b/coroutine/x86/Context.S
index f06a417084..b04e71aa1c 100644
--- a/coroutine/x86/Context.S
+++ b/coroutine/x86/Context.S
@@ -6,12 +6,11 @@
 ##
 
 #define TOKEN_PASTE(x,y) x##y
-#define PREFIXED_SYMBOL(prefix,name) TOKEN_PASTE(prefix,name)
 
 .text
 
-.globl PREFIXED_SYMBOL(SYMBOL_PREFIX,coroutine_transfer)
-PREFIXED_SYMBOL(SYMBOL_PREFIX,coroutine_transfer):
+.globl PREFIXED_SYMBOL(coroutine_transfer)
+PREFIXED_SYMBOL(coroutine_transfer):
 
 	# Save caller registers
 	pushl %ebp
diff --git a/coroutine/x86/Context.h b/coroutine/x86/Context.h
index d98eaf6486..f33b338eab 100644
--- a/coroutine/x86/Context.h
+++ b/coroutine/x86/Context.h
@@ -45,7 +45,7 @@ static inline void coroutine_initialize(
     context->stack_pointer = (void**)((uintptr_t)top & ~0xF);
 
     *--context->stack_pointer = NULL;
-    *--context->stack_pointer = (void*)start;
+    *--context->stack_pointer = (void*)(uintptr_t)start;
 
     context->stack_pointer -= COROUTINE_REGISTERS;
     memset(context->stack_pointer, 0, sizeof(void*) * COROUTINE_REGISTERS);
diff --git a/cygwin/GNUmakefile.in b/cygwin/GNUmakefile.in
index b13c3d9c8a..109baa747d 100644
--- a/cygwin/GNUmakefile.in
+++ b/cygwin/GNUmakefile.in
@@ -2,15 +2,17 @@ gnumake = yes
 
 include Makefile
 
-ENABLE_SHARED=@ENABLE_SHARED@
-DLLWRAP = @DLLWRAP@ --target=@target_os@ --driver-name="$(CC)"
+MUNICODE_FLAG := $(if $(filter mingw%,$(target_os)),-municode)
+override EXE_LDFLAGS += $(MUNICODE_FLAG)
+
+DLLWRAP = @DLLWRAP@ --target=$(target_os) --driver-name="$(CC)"
 windres-cpp := $(CPP) -xc
 windres-cpp := --preprocessor=$(firstword $(windres-cpp)) \
 	$(addprefix --preprocessor-arg=,$(wordlist 2,$(words $(windres-cpp)),$(windres-cpp)))
 WINDRES = @WINDRES@ $(windres-cpp) -DRC_INVOKED
 STRIP = @STRIP@
 
-ifeq (@target_os@,cygwin)
+ifeq ($(target_os),cygwin)
   DLL_BASE_NAME := $(LIBRUBY_SO:.dll=)
 else
   DLL_BASE_NAME := $(RUBY_SO_NAME)
@@ -38,35 +40,36 @@ WPROGRAM = $(RUBYW_INSTALL_NAME)$(EXEEXT)
 
 include $(srcdir)/template/GNUmakefile.in
 
-SOLIBS := $(DLL_BASE_NAME).res.@OBJEXT@ $(SOLIBS)
+SOLIBS := $(DLL_BASE_NAME).res.$(OBJEXT) $(SOLIBS)
 override EXTOBJS += $(if $(filter-out $(RUBYW_INSTALL_NAME),$(@:$(EXEEXT)=)),$(RUBY_INSTALL_NAME),$(@:$(EXEEXT)=)).res.$(OBJEXT)
 RCFILES = $(RUBY_INSTALL_NAME).rc $(RUBYW_INSTALL_NAME).rc $(DLL_BASE_NAME).rc
 RUBYDEF = $(DLL_BASE_NAME).def
+override LIBRUBY_FOR_LEAKED_GLOBALS := # DLL shows symbols from import library
 
 ruby: $(PROGRAM)
 rubyw: $(WPROGRAM)
 
 $(LIBRUBY): $(RUBY_EXP) $(LIBRUBY_SO)
-$(RUBY_EXP) $(LIBRUBY_SO): $(DLL_BASE_NAME).res.@OBJEXT@
+$(RUBY_EXP) $(LIBRUBY_SO): $(DLL_BASE_NAME).res.$(OBJEXT)
 
-%.res.@OBJEXT@: %.rc
+%.res.$(OBJEXT): %.rc
 	$(ECHO) compiling $@
 	$(Q) $(WINDRES) --include-dir . --include-dir $(<D) --include-dir $(srcdir)/win32 $< $@
 
-%.rc: $(RBCONFIG) $(srcdir)/revision.h $(srcdir)/win32/resource.rb
+%.rc: $(BOOTSTRAPRUBY_FAKE) $(RBCONFIG) $(srcdir)/revision.h $(srcdir)/win32/resource.rb
 	$(ECHO) generating $@
-	$(Q) $(MINIRUBY) $(srcdir)/win32/resource.rb \
+	$(Q) $(BOOTSTRAPRUBY_COMMAND) $(srcdir)/win32/resource.rb \
 	  -ruby_name=$(RUBY_INSTALL_NAME) -rubyw_name=$(RUBYW_INSTALL_NAME) \
 	  -so_name=$(DLL_BASE_NAME) -output=$(*F) \
 	  . $(icondirs) $(srcdir)/win32
 
-$(PROGRAM): $(RUBY_INSTALL_NAME).res.@OBJEXT@
-$(WPROGRAM): $(RUBYW_INSTALL_NAME).res.@OBJEXT@
+$(PROGRAM): $(RUBY_INSTALL_NAME).res.$(OBJEXT)
+$(WPROGRAM): $(RUBYW_INSTALL_NAME).res.$(OBJEXT)
 	@rm -f $@
 	$(ECHO) linking $@
-	$(Q) $(PURIFY) $(CC) -mwindows -e $(SYMBOL_PREFIX)mainCRTStartup $(LDFLAGS) $(XLDFLAGS) \
+	$(Q) $(PURIFY) $(CC) $(MUNICODE_FLAG) -mwindows -e $(SYMBOL_PREFIX)mainCRTStartup $(LDFLAGS) $(XLDFLAGS) \
 	  $(MAINOBJ) $(EXTOBJS) $(LIBRUBYARG) $(LIBS) -o $@
-$(STUBPROGRAM): $(RUBY_INSTALL_NAME).res.@OBJEXT@
+$(STUBPROGRAM): $(RUBY_INSTALL_NAME).res.$(OBJEXT)
 
 $(RUBY_EXP): $(LIBRUBY_A)
 	$(ECHO) creating $@
@@ -78,7 +81,7 @@ $(RUBY_EXP): $(LIBRUBY_A)
 
 GNUmakefile:	$(srcdir)/cygwin/GNUmakefile.in
 
-ifeq (@target_os@,mingw32)
+ifeq ($(target_os),mingw32)
 $(OBJS) $(MAINOBJ): win32.h
 
 dir.$(OBJEXT) win32/win32.$(OBJEXT): win32/dir.h
@@ -89,16 +92,19 @@ MSYS2_ARG_CONV_EXCL_PARAM = --exclude=;--name=
 yes-test-ruby:	 export MSYS2_ARG_CONV_EXCL=$(MSYS2_ARG_CONV_EXCL_PARAM)
 yes-test-all:	 export MSYS2_ARG_CONV_EXCL=$(MSYS2_ARG_CONV_EXCL_PARAM)
 yes-test-almost: export MSYS2_ARG_CONV_EXCL=$(MSYS2_ARG_CONV_EXCL_PARAM)
+test/% spec/%/ spec/%_spec.rb: export MSYS2_ARG_CONV_EXCL=$(MSYS2_ARG_CONV_EXCL_PARAM)
 
+distclean-local::
+	$(RMDIR) win32
 endif
 
 $(LIBRUBY_SO): $(RUBYDEF)
 
-$(RUBYDEF): $(LIBRUBY_A) $(PREP) $(RBCONFIG)
+$(RUBYDEF): $(LIBRUBY_A) $(PREP) $(BOOTSTRAPRUBY_FAKE) $(RBCONFIG)
 	$(ECHO) generating $@
-	$(Q) $(MINIRUBY) $(srcdir)/win32/mkexports.rb -output=$@ $(LIBRUBY_A)
+	$(Q) $(BOOTSTRAPRUBY_COMMAND) $(srcdir)/win32/mkexports.rb -output=$@ $(LIBRUBY_A)
 
 clean-local::
 	@$(RM) $(RUBYDEF)
-	@$(RM) $(RUBY_EXP) $(RCFILES:.rc=.res.@OBJEXT@)
+	@$(RM) $(RUBY_EXP) $(RCFILES:.rc=.res.$(OBJEXT))
 	@$(RM) $(RCFILES)
diff --git a/darray.h b/darray.h
index c9a53f1e01..10fd5e4ccc 100644
--- a/darray.h
+++ b/darray.h
@@ -4,6 +4,7 @@
 #include <stdint.h>
 #include <stddef.h>
 #include <stdlib.h>
+#include "ruby/ruby.h"
 
 // Type for a dynamic array. Use to declare a dynamic array.
 // It is a pointer so it fits in st_table nicely. Designed
@@ -37,66 +38,107 @@
 //
 #define rb_darray_ref(ary, idx) (&((ary)->data[(idx)]))
 
-// Copy a new element into the array. ptr_to_ary is evaluated multiple times.
-//
-// void rb_darray_append(rb_darray(T) *ptr_to_ary, T element);
-//
-#define rb_darray_append(ptr_to_ary, element) do {  \
-    rb_darray_ensure_space((ptr_to_ary), sizeof(**(ptr_to_ary)), \
-                           sizeof((*(ptr_to_ary))->data[0])); \
+/* Copy a new element into the array. ptr_to_ary is evaluated multiple times.
+ *
+ * void rb_darray_append(rb_darray(T) *ptr_to_ary, T element);
+ */
+#define rb_darray_append(ptr_to_ary, element) \
+    rb_darray_append_impl(ptr_to_ary, element, rb_darray_realloc_mul_add)
+
+#define rb_darray_append_without_gc(ptr_to_ary, element) \
+    rb_darray_append_impl(ptr_to_ary, element, rb_darray_realloc_mul_add_without_gc)
+
+#define rb_darray_append_impl(ptr_to_ary, element, realloc_func) do {  \
+    rb_darray_ensure_space((ptr_to_ary), \
+                           sizeof(**(ptr_to_ary)), \
+                           sizeof((*(ptr_to_ary))->data[0]), \
+                           realloc_func); \
     rb_darray_set(*(ptr_to_ary), \
                   (*(ptr_to_ary))->meta.size, \
                   (element)); \
     (*(ptr_to_ary))->meta.size++; \
 } while (0)
 
+#define rb_darray_insert_without_gc(ptr_to_ary, idx, element) do { \
+    rb_darray_ensure_space((ptr_to_ary), \
+                           sizeof(**(ptr_to_ary)), \
+                           sizeof((*(ptr_to_ary))->data[0]), \
+                           rb_darray_realloc_mul_add_without_gc); \
+    MEMMOVE( \
+        rb_darray_ref(*(ptr_to_ary), idx + 1), \
+        rb_darray_ref(*(ptr_to_ary), idx), \
+        (*(ptr_to_ary))->data[0], \
+        rb_darray_size(*(ptr_to_ary)) - idx); \
+    rb_darray_set(*(ptr_to_ary), idx, element); \
+    (*(ptr_to_ary))->meta.size++; \
+} while (0)
 
-// Last element of the array
-//
-#define rb_darray_back(ary) ((ary)->data[(ary)->meta.size - 1])
-
-// Remove the last element of the array.
-//
-#define rb_darray_pop_back(ary) ((ary)->meta.size--)
-
-// Remove element at idx and replace it by the last element
-#define rb_darray_remove_unordered(ary, idx) do {   \
-    rb_darray_set(ary, idx, rb_darray_back(ary));   \
-    rb_darray_pop_back(ary);                        \
-} while (0);
+/* Removes the element at idx and replaces it with the last element.
+ * ptr_to_ary and idx is evaluated multiple times.
+ * Warning: not bounds checked.
+ *
+ * void rb_darray_swap_remove(rb_darray(T) *ptr_to_ary, size_t idx);
+ */
+#define rb_darray_swap_remove(ptr_to_ary, idx) do { \
+    size_t _darray_size = rb_darray_size(*(ptr_to_ary)); \
+    if ((idx) != _darray_size - 1) { \
+        (*(ptr_to_ary))->data[idx] = (*(ptr_to_ary))->data[_darray_size - 1]; \
+    } \
+    (*(ptr_to_ary))->meta.size--; \
+} while (0)
 
 // Iterate over items of the array in a for loop
 //
 #define rb_darray_foreach(ary, idx_name, elem_ptr_var) \
     for (size_t idx_name = 0; idx_name < rb_darray_size(ary) && ((elem_ptr_var) = rb_darray_ref(ary, idx_name)); ++idx_name)
 
-// Iterate over valid indicies in the array in a for loop
+// Iterate over valid indices in the array in a for loop
 //
 #define rb_darray_for(ary, idx_name) \
     for (size_t idx_name = 0; idx_name < rb_darray_size(ary); ++idx_name)
 
-// Make a dynamic array of a certain size. All bytes backing the elements are set to zero.
-//
-// Note that NULL is a valid empty dynamic array.
-//
-// void rb_darray_make(rb_darray(T) *ptr_to_ary, size_t size);
-//
+/* Make a dynamic array of a certain size. All bytes backing the elements are set to zero.
+ * Return 1 on success and 0 on failure.
+ *
+ * Note that NULL is a valid empty dynamic array.
+ *
+ * void rb_darray_make(rb_darray(T) *ptr_to_ary, size_t size);
+ */
 #define rb_darray_make(ptr_to_ary, size) \
     rb_darray_make_impl((ptr_to_ary), size, sizeof(**(ptr_to_ary)), \
-                         sizeof((*(ptr_to_ary))->data[0]))
+                         sizeof((*(ptr_to_ary))->data[0]), rb_darray_calloc_mul_add)
 
-#define rb_darray_data_ptr(ary) ((ary)->data)
+#define rb_darray_make_without_gc(ptr_to_ary, size) \
+    rb_darray_make_impl((ptr_to_ary), size, sizeof(**(ptr_to_ary)), \
+                        sizeof((*(ptr_to_ary))->data[0]), rb_darray_calloc_mul_add_without_gc)
 
-// Set the size of the array to zero without freeing the backing memory.
-// Allows reusing the same array.
-//
-#define rb_darray_clear(ary) (ary->meta.size = 0)
+/* Resize the darray to a new capacity. The new capacity must be greater than
+ * or equal to the size of the darray.
+ *
+ * void rb_darray_resize_capa(rb_darray(T) *ptr_to_ary, size_t capa);
+ */
+#define rb_darray_resize_capa_without_gc(ptr_to_ary, capa) \
+    rb_darray_resize_capa_impl((ptr_to_ary), capa, sizeof(**(ptr_to_ary)), \
+                               sizeof((*(ptr_to_ary))->data[0]), rb_darray_realloc_mul_add_without_gc)
+
+#define rb_darray_data_ptr(ary) ((ary)->data)
 
 typedef struct rb_darray_meta {
     size_t size;
     size_t capa;
 } rb_darray_meta_t;
 
+/* Set the size of the array to zero without freeing the backing memory.
+ * Allows reusing the same array. */
+static inline void
+rb_darray_clear(void *ary)
+{
+    rb_darray_meta_t *meta = ary;
+    if (meta) {
+        meta->size = 0;
+    }
+}
+
 // Get the size of the dynamic array.
 //
 static inline size_t
@@ -106,6 +148,17 @@ rb_darray_size(const void *ary)
     return meta ? meta->size : 0;
 }
 
+/* Estimate of the amount of memory used by this darray.
+ * Useful for TypedData objects. */
+#define rb_darray_memsize(ary) (sizeof(*(ary)) + (rb_darray_size(ary) * sizeof((ary)->data[0])))
+
+static inline void
+rb_darray_pop(void *ary, size_t count)
+{
+    rb_darray_meta_t *meta = ary;
+    meta->size -= count;
+}
+
 // Get the capacity of the dynamic array.
 //
 static inline size_t
@@ -115,20 +168,99 @@ rb_darray_capa(const void *ary)
     return meta ? meta->capa : 0;
 }
 
-// Free the dynamic array.
-//
+/* Free the dynamic array. */
 static inline void
 rb_darray_free(void *ary)
 {
-    rb_darray_meta_t *meta = ary;
-    ruby_sized_xfree(ary, meta->capa);
+    xfree(ary);
+}
+
+static inline void
+rb_darray_free_without_gc(void *ary)
+{
+    free(ary);
+}
+
+/* Internal function. Like rb_xcalloc_mul_add. */
+static inline void *
+rb_darray_calloc_mul_add(size_t x, size_t y, size_t z)
+{
+    size_t size = rbimpl_size_add_or_raise(rbimpl_size_mul_or_raise(x, y), z);
+
+    void *ptr = xcalloc(1, size);
+    RUBY_ASSERT(ptr != NULL);
+
+    return ptr;
+}
+
+/* Internal function. Like rb_xcalloc_mul_add but does not trigger GC. */
+static inline void *
+rb_darray_calloc_mul_add_without_gc(size_t x, size_t y, size_t z)
+{
+    size_t size = rbimpl_size_add_or_raise(rbimpl_size_mul_or_raise(x, y), z);
+
+    void *ptr = calloc(1, size);
+    if (ptr == NULL) rb_bug("rb_darray_calloc_mul_add_without_gc: failed");
+
+    return ptr;
+}
+
+/* Internal function. Like rb_xrealloc_mul_add. */
+static inline void *
+rb_darray_realloc_mul_add(void *orig_ptr, size_t x, size_t y, size_t z)
+{
+    size_t size = rbimpl_size_add_or_raise(rbimpl_size_mul_or_raise(x, y), z);
+
+    void *ptr = xrealloc(orig_ptr, size);
+    RUBY_ASSERT(ptr != NULL);
+
+    return ptr;
+}
+
+/* Internal function. Like rb_xrealloc_mul_add but does not trigger GC. */
+static inline void *
+rb_darray_realloc_mul_add_without_gc(void *orig_ptr, size_t x, size_t y, size_t z)
+{
+    size_t size = rbimpl_size_add_or_raise(rbimpl_size_mul_or_raise(x, y), z);
+
+    void *ptr = realloc(orig_ptr, size);
+    if (ptr == NULL) rb_bug("rb_darray_realloc_mul_add_without_gc: failed");
+
+    return ptr;
+}
+
+/* Internal function. Resizes the capacity of a darray. The new capacity must
+ * be greater than or equal to the size of the darray. */
+static inline void
+rb_darray_resize_capa_impl(void *ptr_to_ary, size_t new_capa, size_t header_size, size_t element_size,
+                           void *(*realloc_mul_add_impl)(void *, size_t, size_t, size_t))
+{
+    rb_darray_meta_t **ptr_to_ptr_to_meta = ptr_to_ary;
+    rb_darray_meta_t *meta = *ptr_to_ptr_to_meta;
+
+    rb_darray_meta_t *new_ary = realloc_mul_add_impl(meta, new_capa, element_size, header_size);
+
+    if (meta == NULL) {
+        /* First allocation. Initialize size. On subsequence allocations
+         * realloc takes care of carrying over the size. */
+        new_ary->size = 0;
+    }
+
+    RUBY_ASSERT(new_ary->size <= new_capa);
+
+    new_ary->capa = new_capa;
+
+    // We don't have access to the type of the dynamic array in function context.
+    // Write out result with memcpy to avoid strict aliasing issue.
+    memcpy(ptr_to_ary, &new_ary, sizeof(new_ary));
 }
 
 // Internal function
 // Ensure there is space for one more element.
 // Note: header_size can be bigger than sizeof(rb_darray_meta_t) when T is __int128_t, for example.
 static inline void
-rb_darray_ensure_space(void *ptr_to_ary, size_t header_size, size_t element_size)
+rb_darray_ensure_space(void *ptr_to_ary, size_t header_size, size_t element_size,
+                       void *(*realloc_mul_add_impl)(void *, size_t, size_t, size_t))
 {
     rb_darray_meta_t **ptr_to_ptr_to_meta = ptr_to_ary;
     rb_darray_meta_t *meta = *ptr_to_ptr_to_meta;
@@ -138,25 +270,12 @@ rb_darray_ensure_space(void *ptr_to_ary, size_t header_size, size_t element_size
     // Double the capacity
     size_t new_capa = current_capa == 0 ? 1 : current_capa * 2;
 
-    rb_darray_meta_t *doubled_ary = rb_xrealloc_mul_add(meta, new_capa, element_size, header_size);
-    // rb_xrealloc functions guarantee that NULL is not returned
-    assert(doubled_ary != NULL);
-
-    if (meta == NULL) {
-        // First allocation. Initialize size. On subsequence allocations
-        // realloc takes care of carrying over the size.
-        doubled_ary->size = 0;
-    }
-
-    doubled_ary->capa = new_capa;
-
-    // We don't have access to the type of the dynamic array in function context.
-    // Write out result with memcpy to avoid strict aliasing issue.
-    memcpy(ptr_to_ary, &doubled_ary, sizeof(doubled_ary));
+    rb_darray_resize_capa_impl(ptr_to_ary, new_capa, header_size, element_size, realloc_mul_add_impl);
 }
 
 static inline void
-rb_darray_make_impl(void *ptr_to_ary, size_t array_size, size_t header_size, size_t element_size)
+rb_darray_make_impl(void *ptr_to_ary, size_t array_size, size_t header_size, size_t element_size,
+                    void *(*calloc_mul_add_impl)(size_t, size_t, size_t))
 {
     rb_darray_meta_t **ptr_to_ptr_to_meta = ptr_to_ary;
     if (array_size == 0) {
@@ -164,9 +283,7 @@ rb_darray_make_impl(void *ptr_to_ary, size_t array_size, size_t header_size, siz
         return;
     }
 
-    rb_darray_meta_t *meta = rb_xcalloc_mul_add(array_size, element_size, header_size);
-    // rb_xcalloc functions guarantee that NULL is not returned
-    assert(meta != NULL);
+    rb_darray_meta_t *meta = calloc_mul_add_impl(array_size, element_size, header_size);
 
     meta->size = array_size;
     meta->capa = array_size;
diff --git a/debug.c b/debug.c
index 95a994e63c..1a2c27a5be 100644
--- a/debug.c
+++ b/debug.c
@@ -53,32 +53,29 @@ const union {
     rb_econv_result_t           econv_result;
     enum ruby_preserved_encindex encoding_index;
     enum ruby_robject_flags     robject_flags;
-    enum ruby_robject_consts    robject_consts;
     enum ruby_rmodule_flags     rmodule_flags;
     enum ruby_rstring_flags     rstring_flags;
-#if !USE_RVARGC
-    enum ruby_rstring_consts    rstring_consts;
-#endif
     enum ruby_rarray_flags      rarray_flags;
     enum ruby_rarray_consts     rarray_consts;
+    enum rbimpl_typeddata_flags rtypeddata_consts;
     enum {
-	RUBY_FMODE_READABLE		= FMODE_READABLE,
-	RUBY_FMODE_WRITABLE		= FMODE_WRITABLE,
-	RUBY_FMODE_READWRITE		= FMODE_READWRITE,
-	RUBY_FMODE_BINMODE		= FMODE_BINMODE,
-	RUBY_FMODE_SYNC 		= FMODE_SYNC,
-	RUBY_FMODE_TTY			= FMODE_TTY,
-	RUBY_FMODE_DUPLEX		= FMODE_DUPLEX,
-	RUBY_FMODE_APPEND		= FMODE_APPEND,
-	RUBY_FMODE_CREATE		= FMODE_CREATE,
-	RUBY_FMODE_NOREVLOOKUP		= 0x00000100,
-	RUBY_FMODE_TRUNC		= FMODE_TRUNC,
-	RUBY_FMODE_TEXTMODE		= FMODE_TEXTMODE,
-	RUBY_FMODE_PREP 		= 0x00010000,
-	RUBY_FMODE_SETENC_BY_BOM	= FMODE_SETENC_BY_BOM,
-	RUBY_FMODE_UNIX 		= 0x00200000,
-	RUBY_FMODE_INET 		= 0x00400000,
-	RUBY_FMODE_INET6		= 0x00800000,
+        RUBY_FMODE_READABLE		= FMODE_READABLE,
+        RUBY_FMODE_WRITABLE		= FMODE_WRITABLE,
+        RUBY_FMODE_READWRITE		= FMODE_READWRITE,
+        RUBY_FMODE_BINMODE		= FMODE_BINMODE,
+        RUBY_FMODE_SYNC 		= FMODE_SYNC,
+        RUBY_FMODE_TTY			= FMODE_TTY,
+        RUBY_FMODE_DUPLEX		= FMODE_DUPLEX,
+        RUBY_FMODE_APPEND		= FMODE_APPEND,
+        RUBY_FMODE_CREATE		= FMODE_CREATE,
+        RUBY_FMODE_NOREVLOOKUP		= 0x00000100,
+        RUBY_FMODE_TRUNC		= FMODE_TRUNC,
+        RUBY_FMODE_TEXTMODE		= FMODE_TEXTMODE,
+        RUBY_FMODE_EXTERNAL		= 0x00010000,
+        RUBY_FMODE_SETENC_BY_BOM	= FMODE_SETENC_BY_BOM,
+        RUBY_FMODE_UNIX 		= 0x00200000,
+        RUBY_FMODE_INET 		= 0x00400000,
+        RUBY_FMODE_INET6		= 0x00800000,
 
         RUBY_NODE_TYPESHIFT = NODE_TYPESHIFT,
         RUBY_NODE_TYPEMASK  = NODE_TYPEMASK,
@@ -86,9 +83,9 @@ const union {
         RUBY_NODE_FL_NEWLINE   = NODE_FL_NEWLINE
     } various;
     union {
-	enum imemo_type                     types;
-	enum {RUBY_IMEMO_MASK = IMEMO_MASK} mask;
-	struct RIMemo                      *ptr;
+        enum imemo_type                     types;
+        enum {RUBY_IMEMO_MASK = IMEMO_MASK} mask;
+        struct RIMemo                      *ptr;
     } imemo;
     struct RSymbol *symbol_ptr;
     enum vm_call_flag_bits vm_call_flags;
@@ -100,9 +97,9 @@ int
 ruby_debug_print_indent(int level, int debug_level, int indent_level)
 {
     if (level < debug_level) {
-	fprintf(stderr, "%*s", indent_level, "");
-	fflush(stderr);
-	return TRUE;
+        fprintf(stderr, "%*s", indent_level, "");
+        fflush(stderr);
+        return TRUE;
     }
     return FALSE;
 }
@@ -116,17 +113,17 @@ ruby_debug_printf(const char *format, ...)
     va_end(ap);
 }
 
-#include "gc.h"
+#include "internal/gc.h"
 
 VALUE
 ruby_debug_print_value(int level, int debug_level, const char *header, VALUE obj)
 {
     if (level < debug_level) {
-	char buff[0x100];
-	rb_raw_obj_info(buff, 0x100, obj);
+        char buff[0x100];
+        rb_raw_obj_info(buff, 0x100, obj);
 
-	fprintf(stderr, "DBG> %s: %s\n", header, buff);
-	fflush(stderr);
+        fprintf(stderr, "DBG> %s: %s\n", header, buff);
+        fflush(stderr);
     }
     return obj;
 }
@@ -141,8 +138,8 @@ ID
 ruby_debug_print_id(int level, int debug_level, const char *header, ID id)
 {
     if (level < debug_level) {
-	fprintf(stderr, "DBG> %s: %s\n", header, rb_id2name(id));
-	fflush(stderr);
+        fprintf(stderr, "DBG> %s: %s\n", header, rb_id2name(id));
+        fflush(stderr);
     }
     return id;
 }
@@ -151,22 +148,28 @@ NODE *
 ruby_debug_print_node(int level, int debug_level, const char *header, const NODE *node)
 {
     if (level < debug_level) {
-	fprintf(stderr, "DBG> %s: %s (%u)\n", header,
-		ruby_node_name(nd_type(node)), nd_line(node));
+        fprintf(stderr, "DBG> %s: %s (id: %d, line: %d, location: (%d,%d)-(%d,%d))\n",
+                header, ruby_node_name(nd_type(node)), nd_node_id(node), nd_line(node),
+                nd_first_lineno(node), nd_first_column(node),
+                nd_last_lineno(node), nd_last_column(node));
     }
     return (NODE *)node;
 }
 
 void
+ruby_debug_print_n(const NODE *node)
+{
+    ruby_debug_print_node(0, 1, "", node);
+}
+
+void
 ruby_debug_breakpoint(void)
 {
     /* */
 }
 
 #if defined _WIN32
-# if RUBY_MSVCRT_VERSION >= 80
 extern int ruby_w32_rtc_error;
-# endif
 #endif
 #if defined _WIN32 || defined __CYGWIN__
 #include <windows.h>
@@ -181,12 +184,12 @@ ruby_env_debug_option(const char *str, int len, void *arg)
     int ov;
     size_t retlen;
     unsigned long n;
+#define NAME_MATCH(name) (len == sizeof(name) - 1 && strncmp(str, (name), len) == 0)
 #define SET_WHEN(name, var, val) do {	    \
-	if (len == sizeof(name) - 1 &&	    \
-	    strncmp(str, (name), len) == 0) { \
-	    (var) = (val);		    \
-	    return 1;			    \
-	}				    \
+        if (NAME_MATCH(name)) { \
+            (var) = (val);		    \
+            return 1;			    \
+        }				    \
     } while (0)
 #define NAME_MATCH_VALUE(name)				\
     ((size_t)len >= sizeof(name)-1 &&			\
@@ -195,47 +198,45 @@ ruby_env_debug_option(const char *str, int len, void *arg)
       (str[sizeof(name)-1] == '=' &&			\
        (str += sizeof(name), len -= sizeof(name), 1))))
 #define SET_UINT(val) do { \
-	n = ruby_scan_digits(str, len, 10, &retlen, &ov); \
-	if (!ov && retlen) { \
-	    val = (unsigned int)n; \
-	} \
-	str += retlen; \
-	len -= retlen; \
+        n = ruby_scan_digits(str, len, 10, &retlen, &ov); \
+        if (!ov && retlen) { \
+            val = (unsigned int)n; \
+        } \
+        str += retlen; \
+        len -= retlen; \
     } while (0)
 #define SET_UINT_LIST(name, vals, num) do { \
-	int i; \
-	for (i = 0; i < (num); ++i) { \
-	    SET_UINT((vals)[i]); \
-	    if (!len || *str != ':') break; \
-	    ++str; \
-	    --len; \
-	} \
-	if (len > 0) { \
-	    fprintf(stderr, "ignored "name" option: `%.*s'\n", len, str); \
-	} \
+        int i; \
+        for (i = 0; i < (num); ++i) { \
+            SET_UINT((vals)[i]); \
+            if (!len || *str != ':') break; \
+            ++str; \
+            --len; \
+        } \
+        if (len > 0) { \
+            fprintf(stderr, "ignored "name" option: '%.*s'\n", len, str); \
+        } \
     } while (0)
 #define SET_WHEN_UINT(name, vals, num, req) \
-    if (NAME_MATCH_VALUE(name)) SET_UINT_LIST(name, vals, num);
+    if (NAME_MATCH_VALUE(name)) { \
+        if (!len) req; \
+        else SET_UINT_LIST(name, vals, num); \
+        return 1; \
+    }
 
-    SET_WHEN("gc_stress", *ruby_initial_gc_stress_ptr, Qtrue);
+    if (NAME_MATCH("gc_stress")) {
+        rb_gc_initial_stress_set(Qtrue);
+        return 1;
+    }
     SET_WHEN("core", ruby_enable_coredump, 1);
     SET_WHEN("ci", ruby_on_ci, 1);
-    if (NAME_MATCH_VALUE("rgengc")) {
-	if (!len) ruby_rgengc_debug = 1;
-	else SET_UINT_LIST("rgengc", &ruby_rgengc_debug, 1);
-	return 1;
-    }
+    SET_WHEN_UINT("rgengc", &ruby_rgengc_debug, 1, ruby_rgengc_debug = 1);
 #if defined _WIN32
-# if RUBY_MSVCRT_VERSION >= 80
     SET_WHEN("rtc_error", ruby_w32_rtc_error, 1);
-# endif
 #endif
 #if defined _WIN32 || defined __CYGWIN__
-    if (NAME_MATCH_VALUE("codepage")) {
-	if (!len) fprintf(stderr, "missing codepage argument");
-	else SET_UINT_LIST("codepage", ruby_w32_codepage, numberof(ruby_w32_codepage));
-	return 1;
-    }
+    SET_WHEN_UINT("codepage", ruby_w32_codepage, numberof(ruby_w32_codepage),
+                  fprintf(stderr, "missing codepage argument"));
 #endif
     return 0;
 }
@@ -244,7 +245,7 @@ static void
 set_debug_option(const char *str, int len, void *arg)
 {
     if (!ruby_env_debug_option(str, len, arg)) {
-	fprintf(stderr, "unexpected debug option: %.*s\n", len, str);
+        fprintf(stderr, "unexpected debug option: %.*s\n", len, str);
     }
 }
 
@@ -268,16 +269,41 @@ ruby_set_debug_option(const char *str)
 
 #define MAX_DEBUG_LOG             0x1000
 #define MAX_DEBUG_LOG_MESSAGE_LEN 0x0200
-#define MAX_DEBUG_LOG_FILTER      0x0010
+#define MAX_DEBUG_LOG_FILTER_LEN  0x0020
+#define MAX_DEBUG_LOG_FILTER_NUM  0x0010
 
 enum ruby_debug_log_mode ruby_debug_log_mode;
 
+struct debug_log_filter {
+    enum debug_log_filter_type {
+        dlf_all,
+        dlf_file, // "file:..."
+        dlf_func, // "func:..."
+    } type;
+    bool negative;
+    char str[MAX_DEBUG_LOG_FILTER_LEN];
+};
+
+static const char *dlf_type_names[] = {
+    "all",
+    "file",
+    "func",
+};
+
+#ifdef MAX_PATH
+#define DEBUG_LOG_MAX_PATH (MAX_PATH-1)
+#else
+#define DEBUG_LOG_MAX_PATH 255
+#endif
+
 static struct {
     char *mem;
     unsigned int cnt;
-    char filters[MAX_DEBUG_LOG_FILTER][MAX_DEBUG_LOG_FILTER];
+    struct debug_log_filter filters[MAX_DEBUG_LOG_FILTER_NUM];
     unsigned int filters_num;
+    bool show_pid;
     rb_nativethread_lock_t lock;
+    char output_file[DEBUG_LOG_MAX_PATH+1];
     FILE *output;
 } debug_log;
 
@@ -287,15 +313,86 @@ RUBY_DEBUG_LOG_MEM_ENTRY(unsigned int index)
     return &debug_log.mem[MAX_DEBUG_LOG_MESSAGE_LEN * index];
 }
 
+static enum debug_log_filter_type
+filter_type(const char *str, int *skiplen)
+{
+    if (strncmp(str, "file:", 5) == 0) {
+        *skiplen = 5;
+        return dlf_file;
+    }
+    else if(strncmp(str, "func:", 5) == 0) {
+        *skiplen = 5;
+        return dlf_func;
+    }
+    else {
+        *skiplen = 0;
+        return dlf_all;
+    }
+}
+
+static void
+setup_debug_log_filter(void)
+{
+    const char *filter_config = getenv("RUBY_DEBUG_LOG_FILTER");
+
+    if (filter_config && strlen(filter_config) > 0) {
+        unsigned int i;
+        for (i=0; i<MAX_DEBUG_LOG_FILTER_NUM && filter_config; i++) {
+            size_t len;
+            const char *str = filter_config;
+            const char *p;
+
+            if ((p = strchr(str, ',')) == NULL) {
+                len = strlen(str);
+                filter_config = NULL;
+            }
+            else {
+                len = p - str - 1; // 1 is ','
+                filter_config = p + 1;
+            }
+
+            // positive/negative
+            if (*str == '-') {
+                debug_log.filters[i].negative = true;
+                str++;
+            }
+            else if (*str == '+') {
+                // negative is false on default.
+                str++;
+            }
+
+            // type
+            int skiplen;
+            debug_log.filters[i].type = filter_type(str, &skiplen);
+            len -= skiplen;
+
+            if (len >= MAX_DEBUG_LOG_FILTER_LEN) {
+                fprintf(stderr, "too long: %s (max:%d)\n", str, MAX_DEBUG_LOG_FILTER_LEN - 1);
+                exit(1);
+            }
+
+            // body
+            strncpy(debug_log.filters[i].str, str + skiplen, len);
+            debug_log.filters[i].str[len] = 0;
+        }
+        debug_log.filters_num = i;
+
+        for (i=0; i<debug_log.filters_num; i++) {
+            fprintf(stderr, "RUBY_DEBUG_LOG_FILTER[%d]=%s (%s%s)\n", i,
+                    debug_log.filters[i].str,
+                    debug_log.filters[i].negative ? "-" : "",
+                    dlf_type_names[debug_log.filters[i].type]);
+        }
+    }
+}
+
 static void
 setup_debug_log(void)
 {
     // check RUBY_DEBUG_LOG
     const char *log_config = getenv("RUBY_DEBUG_LOG");
-    if (log_config) {
-        fprintf(stderr, "RUBY_DEBUG_LOG=%s\n", log_config);
-
-        if  (strcmp(log_config, "mem") == 0) {
+    if (log_config && strlen(log_config) > 0) {
+        if (strcmp(log_config, "mem") == 0) {
             debug_log.mem = (char *)malloc(MAX_DEBUG_LOG * MAX_DEBUG_LOG_MESSAGE_LEN);
             if (debug_log.mem == NULL) {
                 fprintf(stderr, "setup_debug_log failed (can't allocate memory)\n");
@@ -308,58 +405,130 @@ setup_debug_log(void)
         }
         else {
             ruby_debug_log_mode |= ruby_debug_log_file;
-            if ((debug_log.output = fopen(log_config, "w")) == NULL) {
+
+            // pid extension with %p
+            unsigned long len = strlen(log_config);
+
+            for (unsigned long i=0, j=0; i<len; i++) {
+                const char c = log_config[i];
+
+                if (c == '%') {
+                    i++;
+                    switch (log_config[i]) {
+                      case '%':
+                        debug_log.output_file[j++] = '%';
+                        break;
+                      case 'p':
+                        snprintf(debug_log.output_file + j, DEBUG_LOG_MAX_PATH - j, "%d", getpid());
+                        j = strlen(debug_log.output_file);
+                        break;
+                      default:
+                        fprintf(stderr, "can not parse RUBY_DEBUG_LOG filename: %s\n", log_config);
+                        exit(1);
+                    }
+                }
+                else {
+                    debug_log.output_file[j++] = c;
+                }
+
+                if (j >= DEBUG_LOG_MAX_PATH) {
+                    fprintf(stderr, "RUBY_DEBUG_LOG=%s is too long\n", log_config);
+                    exit(1);
+                }
+            }
+
+            if ((debug_log.output = fopen(debug_log.output_file, "w")) == NULL) {
                 fprintf(stderr, "can not open %s for RUBY_DEBUG_LOG\n", log_config);
                 exit(1);
             }
             setvbuf(debug_log.output, NULL, _IONBF, 0);
         }
 
+        fprintf(stderr, "RUBY_DEBUG_LOG=%s %s%s%s\n", log_config,
+                (ruby_debug_log_mode & ruby_debug_log_memory) ? "[mem]" : "",
+                (ruby_debug_log_mode & ruby_debug_log_stderr) ? "[stderr]" : "",
+                (ruby_debug_log_mode & ruby_debug_log_file)   ? "[file]" : "");
+        if (debug_log.output_file[0]) {
+            fprintf(stderr, "RUBY_DEBUG_LOG filename=%s\n", debug_log.output_file);
+        }
+
         rb_nativethread_lock_initialize(&debug_log.lock);
+
+        setup_debug_log_filter();
+
+        if (getenv("RUBY_DEBUG_LOG_PID")) {
+            debug_log.show_pid = true;
+        }
     }
+}
 
-    // check RUBY_DEBUG_LOG_FILTER
-    const char *filter_config = getenv("RUBY_DEBUG_LOG_FILTER");
-    if (filter_config && strlen(filter_config) > 0) {
-        unsigned int i;
-        for (i=0; i<MAX_DEBUG_LOG_FILTER; i++) {
-            const char *p;
-            if ((p = strchr(filter_config, ',')) == NULL) {
-                if (strlen(filter_config) >= MAX_DEBUG_LOG_FILTER) {
-                    fprintf(stderr, "too long: %s (max:%d)\n", filter_config, MAX_DEBUG_LOG_FILTER);
-                    exit(1);
-                }
-                strncpy(debug_log.filters[i], filter_config, MAX_DEBUG_LOG_FILTER - 1);
-                i++;
-                break;
-            }
-            else {
-                size_t n = p - filter_config;
-                if (n >= MAX_DEBUG_LOG_FILTER) {
-                    fprintf(stderr, "too long: %s (max:%d)\n", filter_config, MAX_DEBUG_LOG_FILTER);
-                    exit(1);
-                }
-                strncpy(debug_log.filters[i], filter_config, n);
-                filter_config = p+1;
-            }
+static bool
+check_filter(const char *str, const struct debug_log_filter *filter, bool *state)
+{
+    if (filter->negative) {
+        if (strstr(str, filter->str) == NULL) {
+            *state = true;
+            return false;
         }
-        debug_log.filters_num = i;
-        for (i=0; i<debug_log.filters_num; i++) {
-            fprintf(stderr, "RUBY_DEBUG_LOG_FILTER[%d]=%s\n", i, debug_log.filters[i]);
+        else {
+            *state = false;
+            return true;
+        }
+    }
+    else {
+        if (strstr(str, filter->str) != NULL) {
+            *state = true;
+            return true;
+        }
+        else {
+            *state = false;
+            return false;
         }
     }
 }
 
+//
+// RUBY_DEBUG_LOG_FILTER=-foo,-bar,baz,boo
+// returns true if
+//   (func_name or file_name) doesn't contain foo
+// and
+//   (func_name or file_name) doesn't contain bar
+// and
+//   (func_name or file_name) contains baz or boo
+//
+// RUBY_DEBUG_LOG_FILTER=foo,bar,-baz,-boo
+// returns true if
+//   (func_name or file_name) contains foo or bar
+// or
+//   (func_name or file_name) doesn't contain baz and
+//   (func_name or file_name) doesn't contain boo and
+//
+// You can specify "file:" (ex file:foo) or "func:" (ex  func:foo)
+// prefixes to specify the filter for.
+//
 bool
-ruby_debug_log_filter(const char *func_name)
+ruby_debug_log_filter(const char *func_name, const char *file_name)
 {
     if (debug_log.filters_num > 0) {
+        bool state = false;
+
         for (unsigned int i = 0; i<debug_log.filters_num; i++) {
-            if (strstr(func_name, debug_log.filters[i]) != NULL) {
-                return true;
+            const struct debug_log_filter *filter = &debug_log.filters[i];
+
+            switch (filter->type) {
+              case dlf_all:
+                if (check_filter(func_name, filter, &state)) return state;
+                if (check_filter(file_name, filter, &state)) return state;
+                break;
+              case dlf_func:
+                if (check_filter(func_name, filter, &state)) return state;
+                break;
+              case dlf_file:
+                if (check_filter(file_name, filter, &state)) return state;
+                break;
             }
         }
-        return false;
+        return state;
     }
     else {
         return true;
@@ -377,6 +546,7 @@ pretty_filename(const char *path)
     return path;
 }
 
+#undef ruby_debug_log
 void
 ruby_debug_log(const char *file, int line, const char *func_name, const char *fmt, ...)
 {
@@ -384,10 +554,16 @@ ruby_debug_log(const char *file, int line, const char *func_name, const char *fm
     int len = 0;
     int r = 0;
 
+    if (debug_log.show_pid) {
+        r = snprintf(buff + len, MAX_DEBUG_LOG_MESSAGE_LEN, "pid:%d\t", getpid());
+        if (r < 0) rb_bug("ruby_debug_log returns %d", r);
+        len += r;
+    }
+
     // message title
     if (func_name && len < MAX_DEBUG_LOG_MESSAGE_LEN) {
         r = snprintf(buff + len, MAX_DEBUG_LOG_MESSAGE_LEN, "%s\t", func_name);
-        if (r < 0) rb_bug("ruby_debug_log returns %d\n", r);
+        if (r < 0) rb_bug("ruby_debug_log returns %d", r);
         len += r;
     }
 
@@ -406,13 +582,16 @@ ruby_debug_log(const char *file, int line, const char *func_name, const char *fm
     // C location
     if (file && len < MAX_DEBUG_LOG_MESSAGE_LEN) {
         r = snprintf(buff + len, MAX_DEBUG_LOG_MESSAGE_LEN, "\t%s:%d", pretty_filename(file), line);
-        if (r < 0) rb_bug("ruby_debug_log returns %d\n", r);
+        if (r < 0) rb_bug("ruby_debug_log returns %d", r);
         len += r;
     }
 
+    rb_execution_context_t *ec = rb_current_execution_context(false);
+
     // Ruby location
     int ruby_line;
-    const char *ruby_file = rb_source_location_cstr(&ruby_line);
+    const char *ruby_file = ec ? rb_source_location_cstr(&ruby_line) : NULL;
+
     if (len < MAX_DEBUG_LOG_MESSAGE_LEN) {
         if (ruby_file) {
             r = snprintf(buff + len, MAX_DEBUG_LOG_MESSAGE_LEN - len, "\t%s:%d", pretty_filename(ruby_file), ruby_line);
@@ -420,27 +599,50 @@ ruby_debug_log(const char *file, int line, const char *func_name, const char *fm
         else {
             r = snprintf(buff + len, MAX_DEBUG_LOG_MESSAGE_LEN - len, "\t");
         }
-        if (r < 0) rb_bug("ruby_debug_log returns %d\n", r);
+        if (r < 0) rb_bug("ruby_debug_log returns %d", r);
         len += r;
     }
 
-    // ractor information
-    if (ruby_single_main_ractor == NULL) {
-        rb_ractor_t *cr = GET_RACTOR();
-        if (r && len < MAX_DEBUG_LOG_MESSAGE_LEN) {
-            r = snprintf(buff + len, MAX_DEBUG_LOG_MESSAGE_LEN - len, "\tr:#%u/%u",
-                         (unsigned int)rb_ractor_id(cr), GET_VM()->ractor.cnt);
-            if (r < 0) rb_bug("ruby_debug_log returns %d\n", r);
-            len += r;
-        }
+#ifdef RUBY_NT_SERIAL
+    // native thread information
+    if (len < MAX_DEBUG_LOG_MESSAGE_LEN) {
+        r = snprintf(buff + len, MAX_DEBUG_LOG_MESSAGE_LEN - len, "\tnt:%d", ruby_nt_serial);
+        if (r < 0) rb_bug("ruby_debug_log returns %d", r);
+        len += r;
     }
+#endif
+
+    if (ec) {
+        rb_thread_t *th = ec ? rb_ec_thread_ptr(ec) : NULL;
+
+        // ractor information
+        if (ruby_single_main_ractor == NULL) {
+            rb_ractor_t *cr = th ? th->ractor : NULL;
+            rb_vm_t *vm = GET_VM();
+
+            if (r && len < MAX_DEBUG_LOG_MESSAGE_LEN) {
+                r = snprintf(buff + len, MAX_DEBUG_LOG_MESSAGE_LEN - len, "\tr:#%d/%u (%u)",
+                             cr ? (int)rb_ractor_id(cr) : -1, vm->ractor.cnt, vm->ractor.sched.running_cnt);
+
+                if (r < 0) rb_bug("ruby_debug_log returns %d", r);
+                len += r;
+            }
+        }
 
-    // thread information
-    if (!rb_thread_alone()) {
-        const rb_thread_t *th = GET_THREAD();
-        if (r && len < MAX_DEBUG_LOG_MESSAGE_LEN) {
-            r = snprintf(buff + len, MAX_DEBUG_LOG_MESSAGE_LEN - len, "\tth:%p", (void *)th);
-            if (r < 0) rb_bug("ruby_debug_log returns %d\n", r);
+        // thread information
+        if (th && r && len < MAX_DEBUG_LOG_MESSAGE_LEN) {
+            rb_execution_context_t *rec = th->ractor ? th->ractor->threads.running_ec : NULL;
+            const rb_thread_t *rth = rec ? rec->thread_ptr : NULL;
+            const rb_thread_t *sth = th->ractor ? th->ractor->threads.sched.running : NULL;
+
+            if (rth != th || sth != th) {
+                r = snprintf(buff + len, MAX_DEBUG_LOG_MESSAGE_LEN - len, "\tth:%u (rth:%d,sth:%d)",
+                             rb_th_serial(th), rth ? (int)rb_th_serial(rth) : -1, sth ? (int)rb_th_serial(sth) : -1);
+            }
+            else {
+                r = snprintf(buff + len, MAX_DEBUG_LOG_MESSAGE_LEN - len, "\tth:%u", rb_th_serial(th));
+            }
+            if (r < 0) rb_bug("ruby_debug_log returns %d", r);
             len += r;
         }
     }
@@ -478,7 +680,7 @@ debug_log_dump(FILE *out, unsigned int n)
             int index = current_index - size + i;
             if (index < 0) index += MAX_DEBUG_LOG;
             VM_ASSERT(index <= MAX_DEBUG_LOG);
-            const char *mesg = RUBY_DEBUG_LOG_MEM_ENTRY(index);;
+            const char *mesg = RUBY_DEBUG_LOG_MEM_ENTRY(index);
             fprintf(out, "%4u: %s\n", debug_log.cnt - size + i, mesg);
         }
     }
@@ -507,4 +709,22 @@ ruby_debug_log_dump(const char *fname, unsigned int n)
         fclose(fp);
     }
 }
+
+#else
+
+#undef ruby_debug_log
+void
+ruby_debug_log(const char *file, int line, const char *func_name, const char *fmt, ...)
+{
+    va_list args;
+
+    fprintf(stderr, "[%s:%d] %s: ", file, line, func_name);
+
+    va_start(args, fmt);
+    vfprintf(stderr, fmt, args);
+    va_end(args);
+
+    fprintf(stderr, "\n");
+}
+
 #endif // #if USE_RUBY_DEBUG_LOG
diff --git a/debug_counter.c b/debug_counter.c
index e7b0bb0acd..3dcc4c6a3a 100644
--- a/debug_counter.c
+++ b/debug_counter.c
@@ -16,19 +16,19 @@
 
 #if USE_DEBUG_COUNTER
 
-static const char *const debug_counter_names[] = {
-    ""
+const char *const rb_debug_counter_names[] = {
+#define DEBUG_COUNTER_NAME_EMPTY "" /* Suppress -Wstring-concatenation */
+    DEBUG_COUNTER_NAME_EMPTY
+#undef DEBUG_COUNTER_NAME_EMPTY
 #define RB_DEBUG_COUNTER(name) #name,
 #include "debug_counter.h"
 #undef RB_DEBUG_COUNTER
 };
 
-MJIT_SYMBOL_EXPORT_BEGIN
-size_t rb_debug_counter[numberof(debug_counter_names)];
+size_t rb_debug_counter[numberof(rb_debug_counter_names)];
 void rb_debug_counter_add_atomic(enum rb_debug_counter_type type, int add);
-MJIT_SYMBOL_EXPORT_END
 
-rb_nativethread_lock_t debug_counter_lock;
+static rb_nativethread_lock_t debug_counter_lock;
 
 __attribute__((constructor))
 static void
@@ -47,24 +47,14 @@ rb_debug_counter_add_atomic(enum rb_debug_counter_type type, int add)
     rb_nativethread_lock_unlock(&debug_counter_lock);
 }
 
-int debug_counter_disable_show_at_exit = 0;
+static int debug_counter_disable_show_at_exit = 0;
 
 // note that this operation is not atomic.
 void
 ruby_debug_counter_reset(void)
 {
     for (int i = 0; i < RB_DEBUG_COUNTER_MAX; i++) {
-        switch (i) {
-          case RB_DEBUG_COUNTER_mjit_length_unit_queue:
-          case RB_DEBUG_COUNTER_mjit_length_active_units:
-          case RB_DEBUG_COUNTER_mjit_length_compact_units:
-          case RB_DEBUG_COUNTER_mjit_length_stale_units:
-            // These counters may be decreased and should not be reset.
-            break;
-          default:
-            rb_debug_counter[i] = 0;
-            break;
-        }
+        rb_debug_counter[i] = 0;
     }
 }
 
@@ -75,7 +65,7 @@ ruby_debug_counter_get(const char **names_ptr, size_t *counters_ptr)
     int i;
     if (names_ptr != NULL) {
         for (i=0; i<RB_DEBUG_COUNTER_MAX; i++) {
-            names_ptr[i] = debug_counter_names[i];
+            names_ptr[i] = rb_debug_counter_names[i];
         }
     }
     if (counters_ptr != NULL) {
@@ -101,13 +91,13 @@ rb_debug_counter_show_results(const char *msg)
     setlocale(LC_NUMERIC, "");
 
     if (env == NULL || strcmp("1", env) != 0) {
-	int i;
+        int i;
         fprintf(stderr, "[RUBY_DEBUG_COUNTER]\t%d %s\n", getpid(), msg);
-	for (i=0; i<RB_DEBUG_COUNTER_MAX; i++) {
+        for (i=0; i<RB_DEBUG_COUNTER_MAX; i++) {
             fprintf(stderr, "[RUBY_DEBUG_COUNTER]\t%-30s\t%'14"PRIuSIZE"\n",
-		    debug_counter_names[i],
-		    rb_debug_counter[i]);
-	}
+                    rb_debug_counter_names[i],
+                    rb_debug_counter[i]);
+        }
     }
 }
 
diff --git a/debug_counter.h b/debug_counter.h
index 3f0dec948f..c8d8ed8f11 100644
--- a/debug_counter.h
+++ b/debug_counter.h
@@ -49,7 +49,7 @@ RB_DEBUG_COUNTER(cc_temp)       //           dummy CC (stack-allocated)
 RB_DEBUG_COUNTER(cc_found_in_ccs)      // count for CC lookup success in CCS
 RB_DEBUG_COUNTER(cc_not_found_in_ccs)  // count for CC lookup success in CCS
 
-RB_DEBUG_COUNTER(cc_ent_invalidate) // count for invalidating cc (cc->klass = 0)
+RB_DEBUG_COUNTER(cc_ent_invalidate) // count for invalidating cc (cc->klass = Qundef)
 RB_DEBUG_COUNTER(cc_cme_invalidate) // count for invalidating CME
 
 RB_DEBUG_COUNTER(cc_invalidate_leaf)          // count for invalidating klass if klass has no-subclasses
@@ -100,6 +100,13 @@ RB_DEBUG_COUNTER(ccf_opt_block_call)
 RB_DEBUG_COUNTER(ccf_opt_struct_aref)
 RB_DEBUG_COUNTER(ccf_opt_struct_aset)
 RB_DEBUG_COUNTER(ccf_super_method)
+RB_DEBUG_COUNTER(ccf_cfunc_other)
+RB_DEBUG_COUNTER(ccf_cfunc_only_splat)
+RB_DEBUG_COUNTER(ccf_cfunc_only_splat_kw)
+RB_DEBUG_COUNTER(ccf_iseq_bmethod)
+RB_DEBUG_COUNTER(ccf_noniseq_bmethod)
+RB_DEBUG_COUNTER(ccf_opt_send_complex)
+RB_DEBUG_COUNTER(ccf_opt_send_simple)
 
 /*
  * control frame push counts.
@@ -127,30 +134,22 @@ RB_DEBUG_COUNTER(frame_R2C)
 RB_DEBUG_COUNTER(frame_C2C)
 RB_DEBUG_COUNTER(frame_C2R)
 
-/* instance variable counts
- *
- * * ivar_get_ic_hit/miss: ivar_get inline cache (ic) hit/miss counts (VM insn)
- * * ivar_get_ic_miss_serial: ivar_get ic miss reason by serial (VM insn)
- * * ivar_get_ic_miss_unset:                      ... by unset (VM insn)
- * * ivar_get_ic_miss_noobject:                   ... by "not T_OBJECT" (VM insn)
- * * ivar_set_...: same counts with ivar_set (VM insn)
- * * ivar_get/set_base: call counts of "rb_ivar_get/set()".
- *                      because of (1) ic miss.
- *                                 (2) direct call by C extensions.
- */
-RB_DEBUG_COUNTER(ivar_get_ic_hit)
-RB_DEBUG_COUNTER(ivar_get_ic_miss)
-RB_DEBUG_COUNTER(ivar_get_ic_miss_serial)
-RB_DEBUG_COUNTER(ivar_get_ic_miss_unset)
-RB_DEBUG_COUNTER(ivar_get_ic_miss_noobject)
-RB_DEBUG_COUNTER(ivar_set_ic_hit)
-RB_DEBUG_COUNTER(ivar_set_ic_miss)
-RB_DEBUG_COUNTER(ivar_set_ic_miss_serial)
-RB_DEBUG_COUNTER(ivar_set_ic_miss_unset)
-RB_DEBUG_COUNTER(ivar_set_ic_miss_iv_hit)
-RB_DEBUG_COUNTER(ivar_set_ic_miss_noobject)
-RB_DEBUG_COUNTER(ivar_get_base)
-RB_DEBUG_COUNTER(ivar_set_base)
+/* instance variable counts */
+RB_DEBUG_COUNTER(ivar_get_obj_hit)  // Only T_OBJECT hits
+RB_DEBUG_COUNTER(ivar_get_obj_miss) // Only T_OBJECT misses
+RB_DEBUG_COUNTER(ivar_get_ic_hit)   // All hits
+RB_DEBUG_COUNTER(ivar_get_ic_miss)  // All misses
+RB_DEBUG_COUNTER(ivar_set_ic_hit)   // All hits
+RB_DEBUG_COUNTER(ivar_set_obj_hit)  // Only T_OBJECT hits
+RB_DEBUG_COUNTER(ivar_set_obj_miss) // Only T_OBJECT misses
+RB_DEBUG_COUNTER(ivar_set_ic_miss)  // All misses
+RB_DEBUG_COUNTER(ivar_set_ic_miss_noobject)  // Miss because non T_OBJECT
+RB_DEBUG_COUNTER(ivar_get_base) // Calls to `rb_ivar_get` (very slow path)
+RB_DEBUG_COUNTER(ivar_set_base) // Calls to `ivar_set` (very slow path)
+RB_DEBUG_COUNTER(ivar_get_ic_miss_set)   // Misses on IV reads where the cache was wrong
+RB_DEBUG_COUNTER(ivar_get_cc_miss_set)   // Misses on attr_reader where the cache was wrong
+RB_DEBUG_COUNTER(ivar_get_ic_miss_unset) // Misses on IV read where the cache wasn't set
+RB_DEBUG_COUNTER(ivar_get_cc_miss_unset) // Misses on attr_reader where the cache wasn't set
 
 /* local variable counts
  *
@@ -186,8 +185,7 @@ RB_DEBUG_COUNTER(gc_major_force)
 RB_DEBUG_COUNTER(gc_major_oldmalloc)
 
 RB_DEBUG_COUNTER(gc_enter_start)
-RB_DEBUG_COUNTER(gc_enter_mark_continue)
-RB_DEBUG_COUNTER(gc_enter_sweep_continue)
+RB_DEBUG_COUNTER(gc_enter_continue)
 RB_DEBUG_COUNTER(gc_enter_rest)
 RB_DEBUG_COUNTER(gc_enter_finalizer)
 
@@ -216,7 +214,6 @@ RB_DEBUG_COUNTER(gc_isptr_maybe)
  * * [attr]
  *   * _ptr: R?? is not embed.
  *   * _embed: R?? is embed.
- *   * _transient: R?? uses transient heap.
  * * type specific attr.
  *   * str_shared: str is shared.
  *   * str_nofree:        nofree
@@ -242,8 +239,8 @@ RB_DEBUG_COUNTER(obj_promote)
 RB_DEBUG_COUNTER(obj_wb_unprotect)
 
 RB_DEBUG_COUNTER(obj_obj_embed)
-RB_DEBUG_COUNTER(obj_obj_transient)
 RB_DEBUG_COUNTER(obj_obj_ptr)
+RB_DEBUG_COUNTER(obj_obj_too_complex)
 
 RB_DEBUG_COUNTER(obj_str_ptr)
 RB_DEBUG_COUNTER(obj_str_embed)
@@ -252,7 +249,6 @@ RB_DEBUG_COUNTER(obj_str_nofree)
 RB_DEBUG_COUNTER(obj_str_fstr)
 
 RB_DEBUG_COUNTER(obj_ary_embed)
-RB_DEBUG_COUNTER(obj_ary_transient)
 RB_DEBUG_COUNTER(obj_ary_ptr)
 RB_DEBUG_COUNTER(obj_ary_extracapa)
 /*
@@ -276,11 +272,9 @@ RB_DEBUG_COUNTER(obj_hash_g8)
 RB_DEBUG_COUNTER(obj_hash_null)
 RB_DEBUG_COUNTER(obj_hash_ar)
 RB_DEBUG_COUNTER(obj_hash_st)
-RB_DEBUG_COUNTER(obj_hash_transient)
 RB_DEBUG_COUNTER(obj_hash_force_convert)
 
 RB_DEBUG_COUNTER(obj_struct_embed)
-RB_DEBUG_COUNTER(obj_struct_transient)
 RB_DEBUG_COUNTER(obj_struct_ptr)
 
 RB_DEBUG_COUNTER(obj_data_empty)
@@ -311,16 +305,18 @@ RB_DEBUG_COUNTER(obj_imemo_ment)
 RB_DEBUG_COUNTER(obj_imemo_iseq)
 RB_DEBUG_COUNTER(obj_imemo_env)
 RB_DEBUG_COUNTER(obj_imemo_tmpbuf)
-RB_DEBUG_COUNTER(obj_imemo_ast)
 RB_DEBUG_COUNTER(obj_imemo_cref)
 RB_DEBUG_COUNTER(obj_imemo_svar)
 RB_DEBUG_COUNTER(obj_imemo_throw_data)
 RB_DEBUG_COUNTER(obj_imemo_ifunc)
 RB_DEBUG_COUNTER(obj_imemo_memo)
-RB_DEBUG_COUNTER(obj_imemo_parser_strterm)
 RB_DEBUG_COUNTER(obj_imemo_callinfo)
 RB_DEBUG_COUNTER(obj_imemo_callcache)
 RB_DEBUG_COUNTER(obj_imemo_constcache)
+RB_DEBUG_COUNTER(obj_imemo_fields)
+
+RB_DEBUG_COUNTER(opt_new_hit)
+RB_DEBUG_COUNTER(opt_new_miss)
 
 /* ar_table */
 RB_DEBUG_COUNTER(artable_hint_hit)
@@ -335,11 +331,6 @@ RB_DEBUG_COUNTER(heap_xmalloc)
 RB_DEBUG_COUNTER(heap_xrealloc)
 RB_DEBUG_COUNTER(heap_xfree)
 
-/* transient_heap */
-RB_DEBUG_COUNTER(theap_alloc)
-RB_DEBUG_COUNTER(theap_alloc_fail)
-RB_DEBUG_COUNTER(theap_evacuate)
-
 // VM sync
 RB_DEBUG_COUNTER(vm_sync_lock)
 RB_DEBUG_COUNTER(vm_sync_lock_enter)
@@ -347,41 +338,6 @@ RB_DEBUG_COUNTER(vm_sync_lock_enter_nb)
 RB_DEBUG_COUNTER(vm_sync_lock_enter_cr)
 RB_DEBUG_COUNTER(vm_sync_barrier)
 
-/* mjit_exec() counts */
-RB_DEBUG_COUNTER(mjit_exec)
-RB_DEBUG_COUNTER(mjit_exec_not_added)
-RB_DEBUG_COUNTER(mjit_exec_not_ready)
-RB_DEBUG_COUNTER(mjit_exec_not_compiled)
-RB_DEBUG_COUNTER(mjit_exec_call_func)
-
-/* MJIT enqueue / unload */
-RB_DEBUG_COUNTER(mjit_add_iseq_to_process)
-RB_DEBUG_COUNTER(mjit_unload_units)
-
-/* MJIT <-> VM frame push counts */
-RB_DEBUG_COUNTER(mjit_frame_VM2VM)
-RB_DEBUG_COUNTER(mjit_frame_VM2JT)
-RB_DEBUG_COUNTER(mjit_frame_JT2JT)
-RB_DEBUG_COUNTER(mjit_frame_JT2VM)
-
-/* MJIT cancel counters */
-RB_DEBUG_COUNTER(mjit_cancel)
-RB_DEBUG_COUNTER(mjit_cancel_ivar_inline)
-RB_DEBUG_COUNTER(mjit_cancel_exivar_inline)
-RB_DEBUG_COUNTER(mjit_cancel_send_inline)
-RB_DEBUG_COUNTER(mjit_cancel_opt_insn) /* CALL_SIMPLE_METHOD */
-RB_DEBUG_COUNTER(mjit_cancel_invalidate_all)
-RB_DEBUG_COUNTER(mjit_cancel_leave)
-
-/* rb_mjit_unit_list length */
-RB_DEBUG_COUNTER(mjit_length_unit_queue)
-RB_DEBUG_COUNTER(mjit_length_active_units)
-RB_DEBUG_COUNTER(mjit_length_compact_units)
-RB_DEBUG_COUNTER(mjit_length_stale_units)
-
-/* Other MJIT counters */
-RB_DEBUG_COUNTER(mjit_compile_failures)
-
 /* load (not implemented yet) */
 /*
 RB_DEBUG_COUNTER(load_files)
@@ -402,7 +358,7 @@ RB_DEBUG_COUNTER(load_path_is_not_realpath)
 
 enum rb_debug_counter_type {
 #define RB_DEBUG_COUNTER(name) RB_DEBUG_COUNTER_##name,
-#include __FILE__
+#include "debug_counter.h"
     RB_DEBUG_COUNTER_MAX
 #undef RB_DEBUG_COUNTER
 };
diff --git a/defs/gmake.mk b/defs/gmake.mk
index 93aa784fb4..f4b3d79990 100644
--- a/defs/gmake.mk
+++ b/defs/gmake.mk
@@ -1,29 +1,33 @@
 # -*- mode: makefile-gmake; indent-tabs-mode: t -*-
 
 reconfig config.status: export MAKE:=$(MAKE)
+export BASERUBY:=$(BASERUBY)
+export GIT
 override gnumake_recursive := $(if $(findstring n,$(firstword $(MFLAGS))),,+)
 override mflags := $(filter-out -j%,$(MFLAGS))
 MSPECOPT += $(if $(filter -j%,$(MFLAGS)),-j)
 nproc = $(subst -j,,$(filter -j%,$(MFLAGS)))
 
 ifeq ($(GITHUB_ACTIONS),true)
-override ACTIONS_GROUP = @echo "\#\#[group]$(patsubst yes-%,%,$@)"
-override ACTIONS_ENDGROUP = @echo "\#\#[endgroup]"
+# 93(bright yellow) is copied from .github/workflows/mingw.yml
+override ACTIONS_GROUP = @echo "::group::[93m$(@:yes-%=%)[m"
+override ACTIONS_ENDGROUP = @echo "::endgroup::"
 endif
 
-ifneq ($(filter %darwin%,$(arch)),)
-INSTRUBY_ENV += SDKROOT=/
+ifneq ($(filter darwin%,$(target_os)),)
+INSTRUBY_ENV += SDKROOT=
 endif
 INSTRUBY_ARGS += --gnumake
 
+ifeq ($(DOT_WAIT),)
 CHECK_TARGETS := great exam love check test check% test% btest%
 # expand test targets, and those dependents
 TEST_TARGETS := $(filter $(CHECK_TARGETS),$(MAKECMDGOALS))
 TEST_DEPENDS := $(filter-out commit $(TEST_TARGETS),$(MAKECMDGOALS))
 TEST_TARGETS := $(patsubst great,exam,$(TEST_TARGETS))
 TEST_DEPENDS := $(filter-out great $(TEST_TARGETS),$(TEST_DEPENDS))
-TEST_TARGETS := $(patsubst exam,check,$(TEST_TARGETS))
-TEST_TARGETS := $(patsubst check,test-spec test-all test-tool test-short,$(TEST_TARGETS))
+TEST_TARGETS := $(patsubst exam,test-bundled-gems test-bundler-parallel check,$(TEST_TARGETS))
+TEST_TARGETS := $(patsubst check,test-syntax-suggest test-spec test-all test-tool test-short,$(TEST_TARGETS))
 TEST_TARGETS := $(patsubst test-rubyspec,test-spec,$(TEST_TARGETS))
 TEST_DEPENDS := $(filter-out exam check test-spec $(TEST_TARGETS),$(TEST_DEPENDS))
 TEST_TARGETS := $(patsubst love,check,$(TEST_TARGETS))
@@ -33,18 +37,19 @@ TEST_DEPENDS := $(filter-out test-all $(TEST_TARGETS),$(TEST_DEPENDS))
 TEST_TARGETS := $(patsubst test,test-short,$(TEST_TARGETS))
 TEST_DEPENDS := $(filter-out test $(TEST_TARGETS),$(TEST_DEPENDS))
 TEST_TARGETS := $(patsubst test-short,btest-ruby test-knownbug test-basic,$(TEST_TARGETS))
-TEST_TARGETS := $(patsubst test-bundled-gems,test-bundled-gems-run,$(TEST_TARGETS))
+TEST_TARGETS := $(patsubst test-basic,test-basic test-leaked-globals,$(TEST_TARGETS))
+TEST_TARGETS := $(patsubst test-bundled-gems,test-bundled-gems-spec test-bundled-gems-run,$(TEST_TARGETS))
 TEST_TARGETS := $(patsubst test-bundled-gems-run,test-bundled-gems-run $(PREPARE_BUNDLED_GEMS),$(TEST_TARGETS))
 TEST_TARGETS := $(patsubst test-bundled-gems-prepare,test-bundled-gems-prepare $(PRECHECK_BUNDLED_GEMS) test-bundled-gems-fetch,$(TEST_TARGETS))
+TEST_TARGETS := $(patsubst test-bundler-parallel,test-bundler-parallel $(PREPARE_BUNDLER),$(TEST_TARGETS))
+TEST_TARGETS := $(patsubst test-syntax-suggest,test-syntax-suggest $(PREPARE_SYNTAX_SUGGEST),$(TEST_TARGETS))
 TEST_DEPENDS := $(filter-out test-short $(TEST_TARGETS),$(TEST_DEPENDS))
 TEST_DEPENDS += $(if $(filter great exam love check,$(MAKECMDGOALS)),all exts)
+TEST_TARGETS := $(patsubst yes-%,%,$(filter-out no-%,$(TEST_TARGETS)))
+endif
 
 in-srcdir := $(if $(filter-out .,$(srcdir)),$(CHDIR) $(srcdir) &&)
 
-ifneq ($(filter -O0 -Od,$(optflags)),)
-override XCFLAGS := $(filter-out -D_FORTIFY_SOURCE=%,$(XCFLAGS))
-endif
-
 ifeq ($(if $(filter all main exts enc trans libencs libenc libtrans \
 		    prog program ruby ruby$(EXEEXT) \
 		    wprogram rubyw rubyw$(EXEEXT) \
@@ -53,6 +58,13 @@ ifeq ($(if $(filter all main exts enc trans libencs libenc libtrans \
 -include $(SHOWFLAGS)
 endif
 
+ifeq ($(HAVE_BASERUBY):$(HAVE_GIT),yes:yes)
+override modified := $(shell $(BASERUBY) -C $(srcdir) tool/file2lastrev.rb --modified='%Y %m %d')
+override RUBY_RELEASE_YEAR := $(word 1,$(modified))
+override RUBY_RELEASE_MONTH := $(word 2,$(modified))
+override RUBY_RELEASE_DAY := $(word 3,$(modified))
+endif
+
 ifneq ($(filter universal-%,$(arch)),)
 define archcmd
 %.$(1).S: %.c
@@ -68,10 +80,11 @@ define archcmd
 %.i: %.$(1).i
 endef
 
-$(foreach arch,$(arch_flags),\
+$(foreach arch,$(filter -arch=%,$(subst -arch ,-arch=,$(ARCH_FLAG))),\
 	$(eval $(call archcmd,$(patsubst -arch=%,%,$(value arch)),$(patsubst -arch=%,-arch %,$(value arch)))))
 endif
 
+ifeq ($(DOT_WAIT),)
 .PHONY: $(addprefix yes-,$(TEST_TARGETS))
 
 ifneq ($(filter-out btest%,$(TEST_TARGETS)),)
@@ -79,16 +92,34 @@ $(addprefix yes-,$(TEST_TARGETS)): $(TEST_DEPENDS)
 endif
 
 ORDERED_TEST_TARGETS := $(filter $(TEST_TARGETS), \
-	btest-ruby test-knownbug test-basic \
+	btest-ruby test-knownbug test-leaked-globals test-basic \
 	test-testframework test-tool test-ruby test-all \
-	test-spec test-bundler-prepare test-bundler test-bundler-parallel \
+	test-spec test-syntax-suggest-prepare test-syntax-suggest \
+	test-bundler-prepare test-bundler test-bundler-parallel \
 	test-bundled-gems-precheck test-bundled-gems-fetch \
 	test-bundled-gems-prepare test-bundled-gems-run \
+	test-bundled-gems-spec \
+	)
+
+# grep ^yes-test-.*-precheck: template/Makefile.in defs/gmake.mk common.mk
+test_prechecks := $(filter $(ORDERED_TEST_TARGETS),\
+	test-leaked-globals \
+	test-all \
+	test-spec \
+	test-syntax-suggest \
+	test-bundler \
+	test-bundler-parallel \
+	test-bundled-gems\
 	)
-prev_test := $(if $(filter test-spec,$(ORDERED_TEST_TARGETS)),test-spec-precheck)
+prev_test := $(subst test-bundler-parallel,test-bundler,$(test_prechecks))
+prev_test := $(addsuffix -precheck,$(prev_test))
+first_test_prechecks := $(prev_test)
+
 $(foreach test,$(ORDERED_TEST_TARGETS), \
-	$(eval yes-$(value test) no-$(value test): $(value prev_test)); \
+	$(eval yes-$(value test): $(addprefix yes-,$(value prev_test))); \
+	$(eval no-$(value test): $(addprefix no-,$(value prev_test))); \
 	$(eval prev_test := $(value test)))
+endif
 
 ifneq ($(if $(filter install,$(MAKECMDGOALS)),$(filter uninstall,$(MAKECMDGOALS))),)
 install-targets := $(filter install uninstall,$(MAKECMDGOALS))
@@ -131,10 +162,14 @@ endif
 
 config.status: $(wildcard config.cache)
 
+ifneq (ruby,$(PROGRAM))
+ruby: $(PROGRAM);
+endif
+
 STUBPROGRAM = rubystub$(EXEEXT)
 IGNOREDPATTERNS = %~ .% %.orig %.rej \#%\#
 SCRIPTBINDIR := $(if $(EXEEXT),,exec/)
-SCRIPTPROGRAMS = $(addprefix $(SCRIPTBINDIR),$(addsuffix $(EXEEXT),$(filter-out $(IGNOREDPATTERNS),$(notdir $(wildcard $(srcdir)/libexec/*)))))
+SCRIPTPROGRAMS = $(addprefix $(SCRIPTBINDIR),$(addsuffix $(EXEEXT),$(filter-out $(IGNOREDPATTERNS),$(notdir $(wildcard $(srcdir)/bin/*)))))
 
 stub: $(STUBPROGRAM)
 scriptbin: $(SCRIPTPROGRAMS)
@@ -160,28 +195,34 @@ $(SCRIPTBINDIR)%$(EXEEXT): bin/% $(STUBPROGRAM) \
 	$(Q) chmod +x $@
 	$(Q) $(POSTLINK)
 
-$(TIMESTAMPDIR)/.exec.time:
-	$(Q) mkdir exec
-	$(Q) exit > $@
+$(SCRIPTBINDIR):
+	$(Q) mkdir $@
 
 .PHONY: commit
-commit: $(if $(filter commit,$(MAKECMDGOALS)),$(filter-out commit,$(MAKECMDGOALS))) up
+COMMIT_PREPARE := $(subst :,\:,$(filter-out commit do-commit,$(MAKECMDGOALS))) up
+
+commit: pre-commit $(DOT_WAIT) do-commit $(DOT_WAIT) post_commit
+pre-commit: $(COMMIT_PREPARE)
+do-commit: $(if $(DOT_WAIT),,pre-commit)
 	@$(BASERUBY) -C "$(srcdir)" -I./tool/lib -rvcs -e 'VCS.detect(".").commit'
+post-commit: $(if $(DOT_WAIT),,do-commit)
 	+$(Q) \
 	{ \
 	  $(in-srcdir) \
-	  exec sed -f tool/prereq.status defs/gmake.mk template/Makefile.in common.mk; \
+	  exec sed -f tool/prereq.status defs/gmake.mk template/Makefile.in common.mk depend; \
 	} | \
-	$(MAKE) $(mflags) Q=$(Q) ECHO=$(ECHO) srcdir="$(srcdir)" srcs_vpath="" CHDIR="$(CHDIR)" \
-		BOOTSTRAPRUBY="$(BOOTSTRAPRUBY)" MINIRUBY="$(BASERUBY)" BASERUBY="$(BASERUBY)" \
+	$(MAKE) $(mflags) Q=$(Q) ECHO=$(ECHO) \
+		top_srcdir="$(top_srcdir)" srcdir="$(srcdir)" srcs_vpath="" CHDIR="$(CHDIR)" \
+		BOOTSTRAPRUBY="$(BOOTSTRAPRUBY)" BOOTSTRAPRUBY_OPT="$(BOOTSTRAPRUBY_OPT)" \
+		MINIRUBY="$(BASERUBY)" BASERUBY="$(BASERUBY)" HAVE_BASERUBY="$(HAVE_BASERUBY)" \
 		VCSUP="" ENC_MK=.top-enc.mk REVISION_FORCE=PHONY CONFIGURE="$(CONFIGURE)" -f - \
 		update-src srcs all-incs
 
 GITHUB_RUBY_URL = https://github.com/ruby/ruby
 PR =
 
-COMMIT_GPG_SIGN = $(shell git -C "$(srcdir)" config commit.gpgsign)
-REMOTE_GITHUB_URL = $(shell git -C "$(srcdir)" config remote.github.url)
+COMMIT_GPG_SIGN = $(shell $(GIT_IN_SRC) config commit.gpgsign)
+REMOTE_GITHUB_URL = $(shell $(GIT_IN_SRC) config remote.github.url)
 COMMITS_NOTES = commits
 
 .PHONY: fetch-github
@@ -194,21 +235,21 @@ define fetch-github
 	  exit 1; \
 	)
 	$(eval REMOTE_GITHUB_URL := $(REMOTE_GITHUB_URL))
-	$(if $(REMOTE_GITHUB_URL),, \
-	  echo adding $(GITHUB_RUBY_URL) as remote github; \
-	  git -C "$(srcdir)" remote add github $(GITHUB_RUBY_URL); \
-	  git -C "$(srcdir)" config --add remote.github.fetch +refs/notes/$(COMMITS_NOTES):refs/notes/$(COMMITS_NOTES)
-	  $(eval REMOTE_GITHUB_URL := $(GITHUB_RUBY_URL)) \
+	$(if $(REMOTE_GITHUB_URL),,
+	  echo adding $(GITHUB_RUBY_URL) as remote github
+	  $(GIT_IN_SRC) remote add github $(GITHUB_RUBY_URL)
+	  $(GIT_IN_SRC) config --add remote.github.fetch +refs/notes/$(COMMITS_NOTES):refs/notes/$(COMMITS_NOTES)
+	  $(eval REMOTE_GITHUB_URL := $(GITHUB_RUBY_URL))
 	)
-	$(if $(git -C "$(srcdir)" rev-parse "github/pull/$(1)/head" -- 2> /dev/null), \
-	    git -C "$(srcdir)" branch -f "gh-$(1)" "github/pull/$(1)/head", \
-	    git -C "$(srcdir)" fetch -f github "pull/$(1)/head:gh-$(1)" \
+	$(if $(shell $(GIT_IN_SRC) rev-parse "github/pull/$(1)/head" -- 2> /dev/null),
+	    $(GIT_IN_SRC) branch -f "gh-$(1)" "github/pull/$(1)/head",
+	    $(GIT_IN_SRC) fetch -f github "pull/$(1)/head:gh-$(1)"
 	)
 endef
 
 .PHONY: checkout-github
 checkout-github: fetch-github
-	git -C "$(srcdir)" checkout "gh-$(PR)"
+	$(GIT_IN_SRC) checkout "gh-$(PR)"
 
 .PHONY: update-github
 update-github: fetch-github
@@ -221,31 +262,31 @@ update-github: fetch-github
 	$(eval PR_BRANCH := $(word 2,$(PULL_REQUEST_FORK_BRANCH)))
 
 	$(eval GITHUB_UPDATE_WORKTREE := $(shell mktemp -d "$(srcdir)/gh-$(PR)-XXXXXX"))
-	git -C "$(srcdir)" worktree add $(notdir $(GITHUB_UPDATE_WORKTREE)) "gh-$(PR)"
-	git -C "$(GITHUB_UPDATE_WORKTREE)" merge master --no-edit
+	$(GIT_IN_SRC) worktree add $(notdir $(GITHUB_UPDATE_WORKTREE)) "gh-$(PR)"
+	$(GIT) -C "$(GITHUB_UPDATE_WORKTREE)" merge master --no-edit
 	@$(BASERUBY) -e 'print "Are you sure to push this to PR=$(PR)? [Y/n]: "; exit(gets.chomp != "n")'
-	git -C "$(srcdir)" remote add fork-$(PR) git@github.com:$(FORK_REPO).git
-	git -C "$(GITHUB_UPDATE_WORKTREE)" push fork-$(PR) gh-$(PR):$(PR_BRANCH)
-	git -C "$(srcdir)" remote rm fork-$(PR)
-	git -C "$(srcdir)" worktree remove $(notdir $(GITHUB_UPDATE_WORKTREE))
-	git -C "$(srcdir)" branch -D gh-$(PR)
+	$(GIT_IN_SRC) remote add fork-$(PR) git@github.com:$(FORK_REPO).git
+	$(GIT) -C "$(GITHUB_UPDATE_WORKTREE)" push fork-$(PR) gh-$(PR):$(PR_BRANCH)
+	$(GIT_IN_SRC) remote rm fork-$(PR)
+	$(GIT_IN_SRC) worktree remove $(notdir $(GITHUB_UPDATE_WORKTREE))
+	$(GIT_IN_SRC) branch -D gh-$(PR)
 
 .PHONY: pull-github
 pull-github: fetch-github
 	$(call pull-github,$(PR))
 
 define pull-github
-	$(eval GITHUB_MERGE_BASE := $(shell git -C "$(srcdir)" log -1 --format=format:%H))
-	$(eval GITHUB_MERGE_BRANCH := $(shell git -C "$(srcdir)" symbolic-ref --short HEAD))
+	$(eval GITHUB_MERGE_BASE := $(shell $(GIT_LOG_FORMAT)%H -1)
+	$(eval GITHUB_MERGE_BRANCH := $(shell $(GIT_IN_SRC) symbolic-ref --short HEAD))
 	$(eval GITHUB_MERGE_WORKTREE := $(shell mktemp -d "$(srcdir)/gh-$(1)-XXXXXX"))
-	git -C "$(srcdir)" worktree prune
-	git -C "$(srcdir)" worktree add $(notdir $(GITHUB_MERGE_WORKTREE)) "gh-$(1)"
-	git -C "$(GITHUB_MERGE_WORKTREE)" rebase $(GITHUB_MERGE_BRANCH)
+	$(GIT_IN_SRC) worktree prune
+	$(GIT_IN_SRC) worktree add $(notdir $(GITHUB_MERGE_WORKTREE)) "gh-$(1)"
+	$(GIT) -C "$(GITHUB_MERGE_WORKTREE)" rebase $(GITHUB_MERGE_BRANCH)
 	$(eval COMMIT_GPG_SIGN := $(COMMIT_GPG_SIGN))
 	$(if $(filter true,$(COMMIT_GPG_SIGN)), \
-	  git -C "$(GITHUB_MERGE_WORKTREE)" rebase --exec "git commit --amend --no-edit -S" "$(GITHUB_MERGE_BASE)"; \
+	  $(GIT) -C "$(GITHUB_MERGE_WORKTREE)" rebase --exec "$(GIT) commit --amend --no-edit -S" "$(GITHUB_MERGE_BASE)"; \
 	)
-	git -C "$(GITHUB_MERGE_WORKTREE)" rebase --exec "git notes add --message 'Merged: $(GITHUB_RUBY_URL)/pull/$(1)'" "$(GITHUB_MERGE_BASE)"
+	$(GIT) -C "$(GITHUB_MERGE_WORKTREE)" rebase --exec "$(GIT) notes add --message 'Merged: $(GITHUB_RUBY_URL)/pull/$(1)'" "$(GITHUB_MERGE_BASE)"
 endef
 
 .PHONY: fetch-github-%
@@ -254,23 +295,48 @@ fetch-github-%:
 
 .PHONY: checkout-github-%
 checkout-github-%: fetch-github-%
-	git -C "$(srcdir)" checkout "gh-$*"
+	$(GIT_IN_SRC) checkout "gh-$*"
 
 .PHONY: pr-% pull-github-%
 pr-% pull-github-%: fetch-github-%
 	$(call pull-github,$*)
 
 HELP_EXTRA_TASKS = \
-	"  checkout-github:     checkout GitHub Pull Request [PR=1234]" \
-	"  pull-github:         rebase GitHub Pull Request to new worktree [PR=1234]" \
-	"  update-github:       merge master branch and push it to Pull Request [PR=1234]" \
+	"  checkout-github:       checkout GitHub Pull Request [PR=1234]" \
+	"  pull-github:           rebase GitHub Pull Request to new worktree [PR=1234]" \
+	"  update-github:         merge master branch and push it to Pull Request [PR=1234]" \
+	"  tags:                  generate TAGS file" \
 	""
 
-extract-gems: $(HAVE_BASERUBY:yes=update-gems)
-
-bundled-gems := $(shell sed '/^[ 	]*\#/d;/^[ 	]*$$/d;s/[ 	][ 	]*/-/;s/[ 	].*//' $(srcdir)/gems/bundled_gems)
-
-update-gems: | $(patsubst %,gems/%.gem,$(bundled-gems))
+# 1. squeeze spaces
+# 2. strip and skip comment/empty lines
+# 3. "gem x.y.z URL xxxxxx" -> "gem|x.y.z|xxxxxx|URL"
+# 4. "gem x.y.z URL" -> "gem-x.y.z"
+bundled-gems := $(shell sed \
+	-e 's/[ 	][ 	]*/ /g' \
+	-e 's/^ //;s/\#.*//;s/ *$$//;/^$$/d' \
+	$(if $(filter yes,$(HAVE_GIT)), \
+	-e 's/^\(.*\) \(.*\) \(.*\) \(.*\)/\1|\2|\4|\3/' \
+	) \
+	-e 's/ /-/;s/ .*//' \
+	 $(srcdir)/gems/bundled_gems)
+
+bundled-gems-rev := $(filter-out $(subst |,,$(bundled-gems)),$(bundled-gems))
+bundled-gems := $(filter-out $(bundled-gems-rev),$(bundled-gems))
+
+# calls $(1) with name, version, revision, URL
+foreach-bundled-gems-rev = \
+    $(foreach g,$(bundled-gems-rev),$(call foreach-bundled-gems-rev-0,$(1),$(subst |, ,$(value g))))
+foreach-bundled-gems-rev-0 = \
+    $(call $(1),$(word 1,$(2)),$(word 2,$(2)),$(word 3,$(2)),$(word 4,$(2)))
+bundled-gem-gemfile = $(srcdir)/gems/$(1)-$(2).gem
+bundled-gem-gemspec = $(srcdir)/gems/src/$(1)/$(1).gemspec
+bundled-gem-extracted = $(srcdir)/.bundle/gems/$(1)-$(2)
+bundled-gem-revision = $(srcdir)/.bundle/.timestamp/$(1).revision
+
+update-gems: | $(patsubst %,$(srcdir)/gems/%.gem,$(bundled-gems))
+update-gems: | $(call foreach-bundled-gems-rev,bundled-gem-gemfile)
+update-gems: | $(call foreach-bundled-gems-rev,bundled-gem-gemspec)
 
 test-bundler-precheck: | $(srcdir)/.bundle/cache
 
@@ -278,7 +344,7 @@ $(srcdir)/.bundle/cache:
 	$(MAKEDIRS) $(@D) $(CACHE_DIR)
 	$(LN_S) ../.downloaded-cache $@
 
-gems/%.gem:
+$(srcdir)/gems/%.gem:
 	$(ECHO) Downloading bundled gem $*...
 	$(Q) $(BASERUBY) -C "$(srcdir)" \
 	    -I./tool -rdownloader \
@@ -289,128 +355,100 @@ gems/%.gem:
 	    -e 'File.unlink(*old) and' \
 	    -e 'FileUtils.rm_rf(old.map{'"|n|"'n.chomp(".gem")})'
 
-extract-gems: | $(patsubst %,.bundle/gems/%,$(bundled-gems))
+extract-gems: | $(patsubst %,$(srcdir)/.bundle/gems/%,$(bundled-gems))
+extract-gems: | $(call foreach-bundled-gems-rev,bundled-gem-extracted)
 
-.bundle/gems/%: gems/%.gem | .bundle/gems
+$(srcdir)/.bundle/gems/%: $(srcdir)/gems/%.gem | .bundle/gems
 	$(ECHO) Extracting bundle gem $*...
 	$(Q) $(BASERUBY) -C "$(srcdir)" \
-	    -Itool -rgem-unpack \
-	    -e 'Gem.unpack("gems/$(@F).gem", ".bundle/gems", ".bundle/specifications")'
-	$(RMALL) "$(srcdir)/$(@:.gem=)/".git*
+	    -Itool/lib -rbundled_gem \
+	    -e 'BundledGem.unpack("gems/$(@F).gem", ".bundle")'
+
+$(srcdir)/.bundle/.timestamp:
+	$(MAKEDIRS) $@
+
+define build-gem
+$(srcdir)/gems/src/$(1)/.git: | $(srcdir)/gems/src
+	$(ECHO) Cloning $(4)
+	$(Q) $(GIT) clone --depth=1 --no-tags $(4) $$(@D)
+
+$(bundled-gem-revision): \
+	$(if $(if $(wildcard $$(@)),$(filter $(3),$(shell cat $$(@)))),,PHONY) \
+	| $(srcdir)/.bundle/.timestamp $(srcdir)/gems/src/$(1)/.git
+	$(ECHO) Update $(1) to $(3)
+	$(Q) $(CHDIR) "$(srcdir)/gems/src/$(1)" && \
+	    if [ `$(GIT) rev-parse HEAD` != $(3) ]; then \
+	        $(GIT) fetch origin $(3) && \
+	        $(GIT) checkout --detach $(3) && \
+	        :; \
+	    fi
+	echo $(3) | $(IFCHANGE) $$(@) -
+
+# The repository of minitest does not include minitest.gemspec because it uses hoe.
+# This creates a dummy gemspec.
+$(bundled-gem-gemspec): $(bundled-gem-revision) \
+	| $(srcdir)/gems/src/$(1)/.git
+	$(Q) $(BASERUBY) -I$(tooldir)/lib -rbundled_gem -e 'BundledGem.dummy_gemspec(*ARGV)' $$(@)
+
+$(bundled-gem-gemfile): $(bundled-gem-gemspec) $(bundled-gem-revision)
+	$(ECHO) Building $(1)@$(3) to $$(@)
+	$(Q) $(BASERUBY) -C "$(srcdir)" \
+	    -Itool/lib -rbundled_gem \
+	    -e 'BundledGem.build("gems/src/$(1)/$(1).gemspec", "$(2)", "gems", validation: false)'
+
+endef
+define build-gem-0
+$(eval $(call build-gem,$(1),$(2),$(3),$(4)))
+endef
+
+$(call foreach-bundled-gems-rev,build-gem-0)
+
+$(srcdir)/gems/src:
+	$(MAKEDIRS) $@
 
 $(srcdir)/.bundle/gems:
 	$(MAKEDIRS) $@
 
+ifneq ($(DOT_WAIT),)
+up:: $(DOT_WAIT) after-update
+endif
+
 ifneq ($(filter update-bundled_gems refresh-gems,$(MAKECMDGOALS)),)
 update-gems: update-bundled_gems
 endif
 
-ifeq ($(filter 0 1,$(words $(arch_flags))),)
-$(foreach x,$(patsubst -arch=%,%,$(arch_flags)), \
-	  $(eval $$(MJIT_HEADER:.h=)-$(value x).h \
-		 $$(MJIT_MIN_HEADER:.h=)-$(value x).h \
-		 $$(TIMESTAMPDIR)/$$(MJIT_HEADER:.h=)-$(value x).time \
-		 : ARCH_FLAG := -arch $(value x)))
-
-$(foreach x,$(patsubst -arch=%,%,$(arch_flags)), \
-	$(eval $$(MJIT_HEADER:.h=)-$(value x).h: \
-		$$(TIMESTAMPDIR)/$$(MJIT_HEADER:.h=)-$(value x).time))
-
-mjit_min_headers := $(patsubst -arch=%,$(MJIT_MIN_HEADER:.h=-%.h),$(arch_flags))
-$(MJIT_MIN_HEADER): $(mjit_min_headers) $(PREP)
-	@ set -e; set $(patsubst -arch=%,%,$(arch_flags)); \
-	cd $(@D); h=$(@F:.h=); \
-	exec > $(@F).new; \
-	echo '#if 0'; \
-	for arch; do\
-	  echo "#elif defined __$${arch}__"; \
-	  echo "# include \"$$h-$$arch.h\""; \
-	done; \
-	echo "#else"; echo "# error unsupported platform"; echo "#endif"
-	$(IFCHANGE) $@ $@.new
-	$(Q) $(MAKEDIRS) $(MJIT_HEADER_INSTALL_DIR)
-	$(Q) $(MAKE_LINK) $@ $(MJIT_HEADER_INSTALL_DIR)/$(@F)
-
+.SECONDARY: update-unicode-files
+.SECONDARY: update-unicode-auxiliary-files
+.SECONDARY: update-unicode-ucd-emoji-files
+.SECONDARY: update-unicode-emoji-files
+
+ifneq ($(DOT_WAIT),)
+.NOTPARALLEL: update-unicode
+.NOTPARALLEL: update-unicode-files
+.NOTPARALLEL: update-unicode-auxiliary-files
+.NOTPARALLEL: update-unicode-ucd-emoji-files
+.NOTPARALLEL: update-unicode-emoji-files
+.NOTPARALLEL: $(UNICODE_FILES) $(UNICODE_PROPERTY_FILES)
+.NOTPARALLEL: $(UNICODE_AUXILIARY_FILES)
+.NOTPARALLEL: $(UNICODE_UCD_EMOJI_FILES) $(UNICODE_EMOJI_FILES)
 endif
 
-ifeq ($(if $(wildcard $(filter-out .,$(UNICODE_FILES) $(UNICODE_PROPERTY_FILES))),,\
-	   $(wildcard $(srcdir)/lib/unicode_normalize/tables.rb)),)
-# Needs the dependency when any Unicode data file exists, or
-# normalization tables script doesn't.  Otherwise, when the target
-# only exists, use it as-is.
-.PHONY: $(UNICODE_SRC_DATA_DIR)/.unicode-tables.time
-UNICODE_TABLES_TIMESTAMP =
-$(UNICODE_SRC_DATA_DIR)/.unicode-tables.time: \
-	$(UNICODE_FILES) $(UNICODE_PROPERTY_FILES)
+ifeq ($(HAVE_GIT),yes)
+REVISION_LATEST := $(shell $(GIT_LOG_FORMAT)%H -1 2>/dev/null)
+else
+REVISION_LATEST := update
 endif
-
-ifeq ($(wildcard $(srcdir)/revision.h),)
+REVISION_IN_HEADER := $(shell sed '/^\#define RUBY_FULL_REVISION "\(.*\)"/!d;s//\1/;q' $(wildcard $(srcdir)/revision.h revision.h) /dev/null 2>/dev/null)
+ifeq ($(REVISION_IN_HEADER),)
 REVISION_IN_HEADER := none
-REVISION_LATEST := update
-else
-REVISION_IN_HEADER := $(shell sed -n 's/^\#define RUBY_FULL_REVISION "\(.*\)"/\1/p' $(srcdir)/revision.h 2>/dev/null)
-REVISION_LATEST := $(shell $(CHDIR) $(srcdir) && git log -1 --format=%H 2>/dev/null)
 endif
 ifneq ($(REVISION_IN_HEADER),$(REVISION_LATEST))
-# GNU make treat the target as unmodified when its dependents get
-# updated but it is not updated, while others may not.
-$(srcdir)/revision.h: $(REVISION_H)
+$(REVISION_H): PHONY
 endif
 
-# Show Cargo progress when doing `make V=1`
-CARGO_VERBOSE_0 = -q
-CARGO_VERBOSE_1 =
-CARGO_VERBOSE = $(CARGO_VERBOSE_$(V))
-
-# Select between different build profiles with macro substitution
-.PHONY: yjit-static-lib
-yjit-static-lib: yjit-static-lib-$(YJIT_SUPPORT)
-
-# YJIT_SUPPORT=yes when `configure` gets `--enable-yjit`
-yjit-static-lib-yes:
-	$(ECHO) 'building Rust YJIT (release mode)'
-	$(Q) $(RUSTC) \
-	        --crate-name=yjit \
-	        --crate-type=staticlib \
-	        --edition=2021 \
-	        -C opt-level=3 \
-	        -C overflow-checks=on \
-	        '--out-dir=$(CARGO_TARGET_DIR)/release/' \
-	        $(top_srcdir)/yjit/src/lib.rs
-
-yjit-static-lib-no:
-	$(ECHO) 'Error: Tried to build YJIT without configuring it first. Check `make showconfig`?'
-	@false
-
-yjit-static-lib-dev:
-	$(ECHO) 'building Rust YJIT (dev mode)'
-	$(Q) cd $(top_srcdir)/yjit && \
-	        CARGO_TARGET_DIR='$(CARGO_TARGET_DIR)' \
-	        CARGO_TERM_PROGRESS_WHEN='never' \
-	        $(CARGO) $(CARGO_VERBOSE) build $(CARGO_BUILD_ARGS)
-
-# This PHONY prerequisite makes it so that we always run cargo. When there are
-# no Rust changes on rebuild, Cargo does not touch the mtime of the static
-# library and GNU make avoids relinking. $(empty) seems to be important to
-# trigger rebuild each time in release mode.
-$(YJIT_LIBS): yjit-static-lib
-	$(empty)
-
-# Put this here instead of in common.mk to avoid breaking nmake builds
-# TODO: might need to move for BSD Make support
-miniruby$(EXEEXT): $(YJIT_LIBS)
-
-# Generate Rust bindings. See source for details.
-# Needs `./configure --enable-yjit=dev` and Clang.
-ifneq ($(strip $(CARGO)),) # if configure found Cargo
-.PHONY: yjit-bindgen
-yjit-bindgen: yjit.$(OBJEXT)
-	YJIT_SRC_ROOT_PATH='$(top_srcdir)' $(CARGO) run --manifest-path '$(top_srcdir)/yjit/bindgen/Cargo.toml' -- $(CFLAGS) $(XCFLAGS) $(CPPFLAGS)
-
-# For CI, check whether YJIT's FFI bindings are up-to-date.
-check-yjit-bindings: yjit-bindgen
-	git -C "$(top_srcdir)" diff --exit-code yjit/src/cruby_bindings.inc.rs
-endif
+include $(top_srcdir)/yjit/yjit.mk
+include $(top_srcdir)/zjit/zjit.mk
+include $(top_srcdir)/defs/jit.mk
 
 # Query on the generated rdoc
 #
@@ -439,6 +477,10 @@ benchmark/%: miniruby$(EXEEXT) update-benchmark-driver PHONY
 	            --executables="built-ruby::$(BENCH_RUBY) --disable-gem" \
 	            $(srcdir)/$@ $(BENCH_OPTS) $(OPTS)
 
+clean-local:: TARGET_SO = $(PROGRAM) $(WPROGRAM) $(LIBRUBY_SO) $(STATIC_RUBY) miniruby goruby
+clean-local::
+	-$(Q)$(RMALL) $(cleanlibs)
+
 clean-srcs-ext::
 	$(Q)$(RM) $(patsubst $(srcdir)/%,%,$(EXT_SRCS))
 
@@ -454,36 +496,129 @@ endif
 update-deps:
 	$(eval update_deps := $(shell date +update-deps-%Y%m%d))
 	$(eval deps_dir := $(shell mktemp -d)/$(update_deps))
-	$(eval GIT_DIR := $(shell git -C $(srcdir) rev-parse --absolute-git-dir))
-	git --git-dir=$(GIT_DIR) worktree add $(deps_dir)
+	$(eval GIT_DIR := $(shell $(GIT_IN_SRC) rev-parse --absolute-git-dir))
+	$(GIT) --git-dir=$(GIT_DIR) worktree add $(deps_dir)
 	cp $(tooldir)/config.guess $(tooldir)/config.sub $(deps_dir)/tool
 	[ -f config.status ] && cp config.status $(deps_dir)
 	cd $(deps_dir) && autoconf && \
 	exec ./configure -q -C --enable-load-relative --disable-install-doc --disable-rubygems 'optflags=-O0' 'debugflags=-save-temps=obj -g'
 	$(RUNRUBY) -C $(deps_dir) tool/update-deps --fix
-	git -C $(deps_dir) diff --no-ext-diff --ignore-submodules --exit-code || \
-	    git -C $(deps_dir) commit --all --message='Update dependencies'
-	git --git-dir=$(GIT_DIR) worktree remove $(deps_dir)
+	$(GIT) -C $(deps_dir) diff --no-ext-diff --ignore-submodules --exit-code || \
+	    $(GIT) -C $(deps_dir) commit --all --message='Update dependencies'
+	$(GIT) --git-dir=$(GIT_DIR) worktree remove $(deps_dir)
 	$(RMDIR) $(dir $(deps_dir))
-	git --git-dir=$(GIT_DIR) merge --no-edit --ff-only $(update_deps)
-	git --git-dir=$(GIT_DIR) branch --delete $(update_deps)
+	$(GIT) --git-dir=$(GIT_DIR) merge --no-edit --ff-only $(update_deps)
+	$(GIT) --git-dir=$(GIT_DIR) branch --delete $(update_deps)
+
+fix-depends check-depends: all hello
+	$(BASERUBY) -C $(srcdir) tool/update-deps $(if $(filter fix-%,$@),--fix)
 
 # order-only-prerequisites doesn't work for $(RUBYSPEC_CAPIEXT)
 # because the same named directory exists in the source tree.
-$(RUBYSPEC_CAPIEXT)/%.$(DLEXT): $(srcdir)/$(RUBYSPEC_CAPIEXT)/%.c $(srcdir)/$(RUBYSPEC_CAPIEXT)/rubyspec.h $(RUBY_H_INCLUDES) $(LIBRUBY)
-	$(ECHO) building $@
+$(RUBYSPEC_CAPIEXT)/%.$(DLEXT): $(srcdir)/$(RUBYSPEC_CAPIEXT)/%.c $(RUBYSPEC_CAPIEXT_DEPS) \
+	| build-ext
+	$(no_silence:no=$(ECHO) building $@)
 	$(Q) $(MAKEDIRS) $(@D)
-	$(Q) $(DLDSHARED) $(XDLDFLAGS) $(XLDFLAGS) $(LDFLAGS) $(INCFLAGS) $(CPPFLAGS) $(OUTFLAG)$@ $< $(LIBRUBYARG)
+	$(Q) $(DLDSHARED) -L. $(XDLDFLAGS) $(XLDFLAGS) $(LDFLAGS) $(INCFLAGS) $(CPPFLAGS) $(OUTFLAG)$@ $< $(LIBRUBYARG)
+ifneq ($(POSTLINK),)
+	$(Q) $(POSTLINK)
+endif
 	$(Q) $(RMALL) $@.*
 
-rubyspec-capiext: $(patsubst %.c,$(RUBYSPEC_CAPIEXT)/%.$(DLEXT),$(notdir $(wildcard $(srcdir)/$(RUBYSPEC_CAPIEXT)/*.c)))
+RUBYSPEC_CAPIEXT_SO := $(patsubst %.c,$(RUBYSPEC_CAPIEXT)/%.$(DLEXT),$(notdir $(wildcard $(srcdir)/$(RUBYSPEC_CAPIEXT)/*.c)))
+rubyspec-capiext: $(RUBYSPEC_CAPIEXT_SO)
 	@ $(NULLCMD)
 
-ifeq ($(ENABLE_SHARED),yes)
-exts: rubyspec-capiext
-endif
-
-spec/%/ spec/%_spec.rb: programs exts PHONY
+spec/%/ spec/%_spec.rb: programs exts $(RUBYSPEC_CAPIEXT_BUILD) PHONY
 	+$(RUNRUBY) -r./$(arch)-fake $(srcdir)/spec/mspec/bin/mspec-run -B $(srcdir)/spec/default.mspec $(SPECOPTS) $(patsubst %,$(srcdir)/%,$@)
 
 ruby.pc: $(filter-out ruby.pc,$(ruby_pc))
+
+# `make matz`: bump up the MINOR;
+#    Copying NEWS.md to doc/NEWS/, and empty the details in NEWS.md.
+#
+# `make matz NEW=x.y`: bump up to x.y.0;
+#    Just update the version in the title of NEWS.md.
+
+matz: up
+matz-commit: OLD := $(MAJOR).$(MINOR).0
+ifdef NEW
+matz-commit: MAJOR := $(word 1,$(subst ., ,$(NEW)))
+matz-commit: MINOR := $(word 2,$(subst ., ,$(NEW)))
+matz-commit: $(DOT_WAIT) bump_news
+bump_news$(DOT_WAIT): up
+bump_headers$(DOT_WAIT): bump_news
+else
+matz-commit: MINOR := $(shell expr $(MINOR) + 1)
+matz-commit: $(DOT_WAIT) reset_news
+flush_news$(DOT_WAIT): up
+bump_headers$(DOT_WAIT): reset_news
+endif
+
+matz: $(DOT_WAIT) matz-commit
+matz-commit: bump_headers
+matz-commit: override NEW := $(MAJOR).$(MINOR).0
+matz-commit: files := include/ruby/version.h include/ruby/internal/abi.h
+matz-commit: message := Development of $(NEW) started.
+
+flush_news:
+	$(GIT_IN_SRC) mv -f NEWS.md doc/NEWS/NEWS-$(OLD).md
+	$(GIT_IN_SRC) commit -m "[DOC] Flush NEWS.md"
+
+.PHONY: flush_news reset_news bump_news bump_headers
+
+bump_headers:
+	sed -i~ \
+	-e "s/^\(#define RUBY_API_VERSION_MAJOR\) .*/\1 $(MAJOR)/" \
+	-e "s/^\(#define RUBY_API_VERSION_MINOR\) .*/\1 $(MINOR)/" \
+	-e "s/^\(#define RUBY_ABI_VERSION\) .*/\1 0/" \
+	 $(files:%=$(srcdir)/%)
+
+reset_news: flush_news
+	$(BASERUBY) -C $(srcdir) -p -00 \
+	-e 'BEGIN {old, new = ARGV.shift(2); STDOUT.reopen(ARGV.shift)}' \
+	-e 'case $$.' \
+	-e 'when 1; $$_.sub!(/Ruby \K[0-9.]+/, new)' \
+	-e 'when 2; $$_.sub!(/\*\*\K[0-9.]+(?=\*\*)/, old)' \
+	-e 'end' \
+	-e 'next if /^[\[ *]/ =~ $$_' \
+	-e '$$_.sub!(/\n{2,}\z/, "\n\n")' \
+	$(OLD) $(NEW) NEWS.md doc/NEWS/NEWS-$(OLD).md
+
+bump_news:
+	$(BASERUBY) -C $(srcdir) -p -i \
+	-e 'BEGIN {new = ARGV.shift; print gets("").sub(/Ruby \K[0-9.]+/, new)}' \
+	$(NEW) NEWS.md
+
+matz: matz-commit matz-push
+
+matz-commit:
+	$(GIT_IN_SRC) add NEWS.md $(files)
+	$(GIT_IN_SRC) commit -m "$(message)"
+
+GIT_REMOTE_ORIGIN = origin
+
+matz-push: matz-commit
+	$(eval origin_url := $(shell $(GIT_IN_SRC) remote get-url $(GIT_REMOTE_ORIGIN)))
+	$(if $(origin_url),,@false)
+	$(eval last_commit := $(shell $(GIT_IN_SRC) log -n1 --format=%H --author=matz HEAD~..HEAD))
+	$(if $(last_commit),,$(ECHO) No matz commits 1>&2; false)
+	$(if $(filter 12-25 12-26,$(shell date +%m-%d)),,$(ECHO) Not the release date 1>&2; false)
+	$(ECHO) $$'\e[31m'Pushing to $$'\e[7m'$(GIT_REMOTE_ORIGIN)$$'\e[27m'" ($(origin_url))"$$'\e[m'
+	$(GIT_IN_SRC) push $(GIT_REMOTE_ORIGIN)
+
+tags:
+	$(MAKE) GIT="$(GIT)" -C "$(srcdir)" -f defs/tags.mk
+
+
+# ripper_srcs makes all sources at once. invoking this target multiple
+# times in parallel means all sources will be built for the number of
+# sources times respectively.
+ifneq ($(DOT_WAIT),)
+.NOTPARALLEL: ripper_srcs
+else
+ripper_src =
+$(foreach r,$(RIPPER_SRCS),$(eval $(value r): | $(value ripper_src))\
+	$(eval ripper_src := $(value r)))
+ripper_srcs: $(ripper_src)
+endif
diff --git a/defs/id.def b/defs/id.def
index 097e34e405..cd3a8480a2 100644
--- a/defs/id.def
+++ b/defs/id.def
@@ -2,11 +2,13 @@
 firstline, predefined = __LINE__+1, %[\
   max
   min
+  hash
   freeze
   nil?
   inspect
   intern
   object_id
+  __id__
   const_added
   const_missing
   method_missing                                        MethodMissing
@@ -25,7 +27,6 @@ firstline, predefined = __LINE__+1, %[\
   lambda
   send
   __send__
-  __attached__
   __recursive_key__
   initialize
   initialize_copy
@@ -58,6 +59,12 @@ firstline, predefined = __LINE__+1, %[\
   quo
   name
   nil
+  path
+  pack
+  buffer
+  include?
+  aborted
+  exited
 
   _                                                     UScore
 
@@ -71,10 +78,13 @@ firstline, predefined = __LINE__+1, %[\
   _7  NUMPARAM_7
   _8  NUMPARAM_8
   _9  NUMPARAM_9
+  <it>  ItImplicit
+  it    It
 
   "/*NULL*/"                                            NULL
   empty?
   eql?
+  default
   respond_to?                                           Respond_to
   respond_to_missing?                                   Respond_to_missing
   <IFUNC>
@@ -95,6 +105,8 @@ firstline, predefined = __LINE__+1, %[\
   $_                                                    LASTLINE
   $~                                                    BACKREF
   $!                                                    ERROR_INFO
+
+  Ruby
 ]
 
 # VM ID         OP      Parser Token
@@ -194,13 +206,14 @@ predefined.split(/^/).each_with_index do |line, num|
   end << token
   predefined_ids[token] = name
 end
+index = 127
 token_ops.split(/^/).each do |line|
   next if /^#/ =~ line
   line.sub!(/\s+#.*/, '')
   id, op, token = line.split
   next unless id and op
   token ||= (id unless /\A\W\z/ =~ op)
-  token_op_ids << [id, op, token]
+  token_op_ids << [id, op, token, (index += 1 if token)]
 end
 {
   "LOCAL" => local_ids,
@@ -212,4 +225,5 @@ end
   :preserved => preserved_ids,
   :predefined => predefined_ids,
   :token_op => token_op_ids,
+  :last_token => index,
 }
diff --git a/defs/jit.mk b/defs/jit.mk
new file mode 100644
index 0000000000..27b14e7a07
--- /dev/null
+++ b/defs/jit.mk
@@ -0,0 +1,96 @@
+# Make recipes that deal with the rust code of YJIT and ZJIT.
+#
+# $(gnumake_recursive) adds the '+' prefix to pass down GNU make's
+# jobserver resources to cargo/rustc as rust-lang.org recommends.
+# Without it, certain make version trigger a warning. It does not
+# add the prefix when `make --dry-run` so dry runs are indeed dry.
+
+ifneq ($(JIT_CARGO_SUPPORT),no)
+
+# Show Cargo progress when doing `make V=1`
+CARGO_VERBOSE_0 = -q
+CARGO_VERBOSE_1 =
+CARGO_VERBOSE = $(CARGO_VERBOSE_$(V))
+
+# Because of Cargo cache, if the actual binary is not changed from the
+# previous build, the mtime is preserved as the cached file.
+# This means the target is not updated actually, and it will need to
+# rebuild at the next build.
+RUST_LIB_TOUCH = touch $@
+
+# NOTE: MACOSX_DEPLOYMENT_TARGET to match `rustc --print deployment-target` to avoid the warning below.
+#    ld: warning: object file (target/debug/libjit.a(<libcapstone object>)) was built for
+#    newer macOS version (15.2) than being linked (15.0)
+# This limits us to an older set of macOS API in the rust code, but we don't use any.
+$(RUST_LIB): $(srcdir)/ruby.rs
+	$(Q)if [ '$(ZJIT_SUPPORT)' != no -a '$(YJIT_SUPPORT)' != no ]; then \
+	    echo 'building YJIT and ZJIT ($(JIT_CARGO_SUPPORT:yes=release) mode)'; \
+	elif [ '$(ZJIT_SUPPORT)' != no ]; then \
+	    echo 'building ZJIT ($(JIT_CARGO_SUPPORT) mode)'; \
+	elif [ '$(YJIT_SUPPORT)' != no ]; then \
+	    echo 'building YJIT ($(JIT_CARGO_SUPPORT) mode)'; \
+	fi
+	$(gnumake_recursive)$(Q)CARGO_TARGET_DIR='$(CARGO_TARGET_DIR)' \
+	    CARGO_TERM_PROGRESS_WHEN='never' \
+	    MACOSX_DEPLOYMENT_TARGET=11.0 \
+	    $(CARGO) $(CARGO_VERBOSE) build --manifest-path '$(top_srcdir)/Cargo.toml' $(CARGO_BUILD_ARGS)
+	$(RUST_LIB_TOUCH)
+else ifneq ($(strip $(RLIB_DIR)),) # combo build
+
+$(RUST_LIB): $(srcdir)/ruby.rs
+	$(ECHO) 'building $(@F)'
+	$(gnumake_recursive)$(Q) $(RUSTC) --edition=2024 \
+	    $(RUSTC_FLAGS) \
+	    '-L$(@D)' \
+	    --extern=yjit \
+	    --extern=zjit \
+	    --crate-type=staticlib \
+	    --cfg 'feature="yjit"' \
+	    --cfg 'feature="zjit"' \
+	    '--out-dir=$(@D)' \
+	    '$(top_srcdir)/ruby.rs'
+
+# Absolute path to avoid VPATH ambiguity
+JIT_RLIB = $(TOP_BUILD_DIR)/$(RLIB_DIR)/libjit.rlib
+$(YJIT_RLIB): $(JIT_RLIB)
+$(ZJIT_RLIB): $(JIT_RLIB)
+$(JIT_RLIB):
+	$(ECHO) 'building $(@F)'
+	$(gnumake_recursive)$(Q) $(RUSTC) --crate-name=jit \
+	    --edition=2024 \
+	    $(JIT_RUST_FLAGS) \
+	    $(RUSTC_FLAGS) \
+	    '--out-dir=$(@D)' \
+	    '$(top_srcdir)/jit/src/lib.rs'
+endif # ifneq ($(JIT_CARGO_SUPPORT),no)
+
+RUST_LIB_SYMBOLS = $(RUST_LIB:.a=).symbols
+$(RUST_LIBOBJ): $(RUST_LIB)
+	$(ECHO) 'partial linking $(RUST_LIB) into $@'
+ifneq ($(findstring darwin,$(target_os)),)
+	$(Q) $(CC) -nodefaultlibs -r -o $@ -exported_symbols_list $(RUST_LIB_SYMBOLS) $(RUST_LIB)
+else
+	$(Q) $(LD) -r -o $@ --whole-archive $(RUST_LIB)
+	-$(Q) $(OBJCOPY) --wildcard --keep-global-symbol='$(SYMBOL_PREFIX)rb_*' $(@)
+endif
+
+rust-libobj: $(RUST_LIBOBJ)
+rust-lib: $(RUST_LIB)
+
+# For Darwin only: a list of symbols that we want the glommed Rust static lib to export.
+# Unfortunately, using wildcard like '_rb_*' with -exported-symbol does not work, at least
+# not on version 820.1. Assume llvm-nm, so XCode 8.0 (from 2016) or newer.
+#
+# The -exported_symbols_list pulls out the right archive members. Symbols not listed
+# in the list are made private extern, which are in turn made local as we're using `ld -r`.
+# Note, section about -keep_private_externs in ld's man page hints at this behavior on which
+# we rely.
+ifneq ($(findstring darwin,$(target_os)),)
+$(RUST_LIB_SYMBOLS): $(RUST_LIB)
+	$(Q) $(tooldir)/darwin-ar $(NM) --defined-only --extern-only $(RUST_LIB) | \
+	sed -n -e 's/.* //' -e '/^$(SYMBOL_PREFIX)rb_/p' \
+	-e '/^$(SYMBOL_PREFIX)rust_eh_personality/p' \
+	> $@
+
+$(RUST_LIBOBJ): $(RUST_LIB_SYMBOLS)
+endif
diff --git a/defs/keywords b/defs/keywords
index fc30ec2d15..a1b1f4f60f 100644
--- a/defs/keywords
+++ b/defs/keywords
@@ -2,7 +2,7 @@
 struct kwtable {short name, id[2], state;};
 const struct kwtable *rb_reserved_word(const char *, unsigned int);
 #ifndef RIPPER
-static const struct kwtable *reserved_word(/*!ANSI{*/const char *, unsigned int/*}!ANSI*/);
+static const struct kwtable *reserved_word(register const char *str, register size_t len);
 #define rb_reserved_word(str, len) reserved_word(str, len)
 %}
 
diff --git a/defs/known_errors.def b/defs/known_errors.def
index e9694cfbda..23e9e53507 100644
--- a/defs/known_errors.def
+++ b/defs/known_errors.def
@@ -1,157 +1,157 @@
-E2BIG
-EACCES
-EADDRINUSE
-EADDRNOTAVAIL
-EADV
-EAFNOSUPPORT
-EAGAIN
-EALREADY
-EAUTH
-EBADARCH
-EBADE
-EBADEXEC
-EBADF
-EBADFD
-EBADMACHO
-EBADMSG
-EBADR
-EBADRPC
-EBADRQC
-EBADSLT
-EBFONT
-EBUSY
-ECANCELED
-ECAPMODE
-ECHILD
-ECHRNG
-ECOMM
-ECONNABORTED
-ECONNREFUSED
-ECONNRESET
-EDEADLK
-EDEADLOCK
-EDESTADDRREQ
-EDEVERR
-EDOM
-EDOOFUS
-EDOTDOT
-EDQUOT
-EEXIST
-EFAULT
-EFBIG
-EFTYPE
-EHOSTDOWN
-EHOSTUNREACH
-EHWPOISON
-EIDRM
-EILSEQ
-EINPROGRESS
-EINTR
-EINVAL
-EIO
-EIPSEC
-EISCONN
-EISDIR
-EISNAM
-EKEYEXPIRED
-EKEYREJECTED
-EKEYREVOKED
-EL2HLT
-EL2NSYNC
-EL3HLT
-EL3RST
-ELAST
-ELIBACC
-ELIBBAD
-ELIBEXEC
-ELIBMAX
-ELIBSCN
-ELNRNG
-ELOOP
-EMEDIUMTYPE
-EMFILE
-EMLINK
-EMSGSIZE
-EMULTIHOP
-ENAMETOOLONG
-ENAVAIL
-ENEEDAUTH
-ENETDOWN
-ENETRESET
-ENETUNREACH
-ENFILE
-ENOANO
-ENOATTR
-ENOBUFS
-ENOCSI
-ENODATA
-ENODEV
-ENOENT
-ENOEXEC
-ENOKEY
-ENOLCK
-ENOLINK
-ENOMEDIUM
-ENOMEM
-ENOMSG
-ENONET
-ENOPKG
-ENOPOLICY
-ENOPROTOOPT
-ENOSPC
-ENOSR
-ENOSTR
-ENOSYS
-ENOTBLK
-ENOTCAPABLE
-ENOTCONN
-ENOTDIR
-ENOTEMPTY
-ENOTNAM
-ENOTRECOVERABLE
-ENOTSOCK
-ENOTSUP
-ENOTTY
-ENOTUNIQ
-ENXIO
-EOPNOTSUPP
-EOVERFLOW
-EOWNERDEAD
-EPERM
-EPFNOSUPPORT
-EPIPE
-EPROCLIM
-EPROCUNAVAIL
-EPROGMISMATCH
-EPROGUNAVAIL
-EPROTO
-EPROTONOSUPPORT
-EPROTOTYPE
-EPWROFF
-EQFULL
-ERANGE
-EREMCHG
-EREMOTE
-EREMOTEIO
-ERESTART
-ERFKILL
-EROFS
-ERPCMISMATCH
-ESHLIBVERS
-ESHUTDOWN
-ESOCKTNOSUPPORT
-ESPIPE
-ESRCH
-ESRMNT
-ESTALE
-ESTRPIPE
-ETIME
-ETIMEDOUT
-ETOOMANYREFS
-ETXTBSY
-EUCLEAN
-EUNATCH
-EUSERS
-EWOULDBLOCK
-EXDEV
-EXFULL
+E2BIG           Argument list too long
+EACCES          Permission denied
+EADDRINUSE      Address already in use
+EADDRNOTAVAIL   Address not available
+EADV            Advertise error
+EAFNOSUPPORT    Address family not supported
+EAGAIN          Resource temporarily unavailable, try again (may be the same value as EWOULDBLOCK)
+EALREADY        Connection already in progress
+EAUTH           Authentication error
+EBADARCH        Bad CPU type in executable
+EBADE           Bad exchange
+EBADEXEC        Bad executable
+EBADF           Bad file descriptor
+EBADFD          File descriptor in bad state
+EBADMACHO       Malformed Macho file
+EBADMSG         Bad message
+EBADR           Invalid request descriptor
+EBADRPC         RPC struct is bad
+EBADRQC         Invalid request code
+EBADSLT         Invalid slot
+EBFONT          Bad font file format
+EBUSY           Device or resource busy
+ECANCELED       Operation canceled
+ECAPMODE        Not permitted in capability mode
+ECHILD          No child processes
+ECHRNG          Channel number out of range
+ECOMM           Communication error on send
+ECONNABORTED    Connection aborted
+ECONNREFUSED    Connection refused
+ECONNRESET      Connection reset
+EDEADLK         Resource deadlock avoided
+EDEADLOCK       File locking deadlock error
+EDESTADDRREQ    Destination address required
+EDEVERR         Device error; e.g., printer paper out
+EDOM            Mathematics argument out of domain of function
+EDOOFUS         Improper function use
+EDOTDOT         RFS specific error
+EDQUOT          Disk quota exceeded
+EEXIST          File exists
+EFAULT          Bad address
+EFBIG           File too large
+EFTYPE          Invalid file type or format
+EHOSTDOWN       Host is down
+EHOSTUNREACH    Host is unreachable
+EHWPOISON       Memory page has hardware error
+EIDRM           Identifier removed
+EILSEQ          Invalid or incomplete multibyte or wide character
+EINPROGRESS     Operation in progress
+EINTR           Interrupted function call
+EINVAL          Invalid argument
+EIO             Input/output error
+EIPSEC          IPsec processing failure
+EISCONN         Socket is connected
+EISDIR          Is a directory
+EISNAM          Is a named file type
+EKEYEXPIRED     Key has expired
+EKEYREJECTED    Key was rejected by service
+EKEYREVOKED     Key has been revoked
+EL2HLT          Level 2 halted
+EL2NSYNC        Level 2 not synchronized
+EL3HLT          Level 3 halted
+EL3RST          Level 3 reset
+ELIBACC         Cannot access a needed shared library
+ELIBBAD         Accessing a corrupted shared library
+ELIBEXEC        Cannot exec a shared library directly
+ELIBMAX         Attempting to link in too many shared libraries
+ELIBSCN         .lib section in a.out corrupted
+ELNRNG          Link number out of range
+ELOOP           Too many levels of symbolic links
+EMEDIUMTYPE     Wrong medium type
+EMFILE          Too many open files
+EMLINK          Too many links
+EMSGSIZE        Message too long
+EMULTIHOP       Multihop attempted
+ENAMETOOLONG    Filename too long
+ENAVAIL         No XENIX semaphores available
+ENEEDAUTH       Need authenticator
+ENETDOWN        Network is down
+ENETRESET       Connection aborted by network
+ENETUNREACH     Network unreachable
+ENFILE          Too many open files in system
+ENOANO          No anode
+ENOATTR         Attribute not found
+ENOBUFS         No buffer space available
+ENOCSI          No CSI structure available
+ENODATA         No data available
+ENODEV          No such device
+ENOENT          No such file or directory
+ENOEXEC         Exec format error
+ENOKEY          Required key not available
+ENOLCK          No locks available
+ENOLINK         Link has been severed
+ENOMEDIUM       No medium found
+ENOMEM          Not enough space/cannot allocate memory
+ENOMSG          No message of the desired type
+ENONET          Machine is not on the network
+ENOPKG          Package not installed
+ENOPOLICY       No such policy
+ENOPROTOOPT     Protocol not available
+ENOSPC          No space left on device
+ENOSR           No STREAM resources
+ENOSTR          Not a STREAM
+ENOSYS          Functionality not implemented
+ENOTBLK         Block device required
+ENOTCAPABLE     Capabilities insufficient
+ENOTCONN        The socket is not connected
+ENOTDIR         Not a directory
+ENOTEMPTY       Directory not empty
+ENOTNAM         Not a XENIX named type file
+ENOTRECOVERABLE State not recoverable
+ENOTSOCK        Not a socket
+ENOTSUP         Operation not supported
+ENOTTY          Inappropriate I/O control operation
+ENOTUNIQ        Name not unique on network
+ENXIO           No such device or address
+EOPNOTSUPP      Operation not supported on socket
+EOVERFLOW       Value too large to be stored in data type
+EOWNERDEAD      Owner died
+EPERM           Operation not permitted
+EPFNOSUPPORT    Protocol family not supported
+EPIPE           Broken pipe
+EPROCLIM        Too many processes
+EPROCUNAVAIL    Bad procedure for program
+EPROGMISMATCH   Program version wrong
+EPROGUNAVAIL    RPC program isn't available
+EPROTO          Protocol error
+EPROTONOSUPPORT Protocol not supported
+EPROTOTYPE      Protocol wrong type for socket
+EPWROFF         Device power is off
+EQFULL          Interface output queue is full
+ERANGE          Result too large
+EREMCHG         Remote address changed
+EREMOTE         Object is remote
+EREMOTEIO       Remote I/O error
+ERESTART        Interrupted system call should be restarted
+ERFKILL         Operation not possible due to RF-kill
+EROFS           Read-only file system
+ERPCMISMATCH    RPC version wrong
+ESHLIBVERS      Shared library version mismatch
+ESHUTDOWN       Cannot send after transport endpoint shutdown
+ESOCKTNOSUPPORT Socket type not supported
+ESPIPE          Illegal seek
+ESRCH           No such process
+ESRMNT          Server mount error
+ESTALE          Stale file handle
+ESTRPIPE        Streams pipe error
+ETIME           Timer expired
+ETIMEDOUT       Connection timed out
+ETOOMANYREFS    Too many references: cannot splice
+ETXTBSY         Text file busy
+EUCLEAN         Structure needs cleaning
+EUNATCH         Protocol driver not attached
+EUSERS          Too many users
+EWOULDBLOCK     Operation would block
+EXDEV           Invalid cross-device link
+EXFULL          Exchange full
+ELAST           Largest errno value
diff --git a/defs/lex.c.src b/defs/lex.c.src
index fc30ec2d15..a1b1f4f60f 100644
--- a/defs/lex.c.src
+++ b/defs/lex.c.src
@@ -2,7 +2,7 @@
 struct kwtable {short name, id[2], state;};
 const struct kwtable *rb_reserved_word(const char *, unsigned int);
 #ifndef RIPPER
-static const struct kwtable *reserved_word(/*!ANSI{*/const char *, unsigned int/*}!ANSI*/);
+static const struct kwtable *reserved_word(register const char *str, register size_t len);
 #define rb_reserved_word(str, len) reserved_word(str, len)
 %}
 
diff --git a/defs/tags.mk b/defs/tags.mk
new file mode 100644
index 0000000000..d29260c294
--- /dev/null
+++ b/defs/tags.mk
@@ -0,0 +1,18 @@
+# -*- mode: makefile-gmake; indent-tabs-mode: t -*-
+
+SRCS := $(shell $(GIT) ls-files \
+	*.[chy] *.def *.inc *.rb \
+	ccan/ coroutine/ include/ internal/ missing/ \
+	'enc/**/*.[ch]' 'win32/**/*.[ch]' \
+	)
+
+TAGS: $(SRCS)
+	@echo updating $@
+	@tmp=$$(mktemp); \
+	trap 'rm -f "$$tmp"' 0; \
+	{ \
+	  $(GIT) grep -h --no-line-number -o '^ *# *define  *RBIMPL_ATTR_[A-Z_]*(*' -- include | \
+	    sed 's/^ *# *define *//;/_H$$/d;y/(/+/' | sort -u && \
+	  echo 'NORETURN+'; \
+	} > "$$tmp" && \
+	ctags -e -I@"$$tmp" -h .def.inc --langmap=c:+.y.def.inc $(^)
diff --git a/defs/universal.mk b/defs/universal.mk
deleted file mode 100644
index c34a31b356..0000000000
--- a/defs/universal.mk
+++ /dev/null
@@ -1,5 +0,0 @@
-arch_flags := $(filter -arch=%,$(subst -arch ,-arch=,$(ARCH_FLAG)))
-ifeq ($(filter 0 1,$(words $(arch_flags))),)
-override MJIT_HEADER_SUFFIX = -%
-override MJIT_HEADER_ARCH = -$(word 2,$(ARCH_FLAG))
-endif
diff --git a/depend b/depend
new file mode 100644
index 0000000000..7372902666
--- /dev/null
+++ b/depend
@@ -0,0 +1,20573 @@
+# AUTOGENERATED DEPENDENCIES START
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+zjit.$(OBJEXT): {$(VPATH)}internal/config.h
+zjit.$(OBJEXT): {$(VPATH)}internal/constant_p.h
+zjit.$(OBJEXT): {$(VPATH)}internal/core.h
+zjit.$(OBJEXT): {$(VPATH)}internal/core/rarray.h
+zjit.$(OBJEXT): {$(VPATH)}internal/core/rbasic.h
+zjit.$(OBJEXT): {$(VPATH)}internal/core/rbignum.h
+zjit.$(OBJEXT): {$(VPATH)}internal/core/rclass.h
+zjit.$(OBJEXT): {$(VPATH)}internal/core/rdata.h
+zjit.$(OBJEXT): {$(VPATH)}internal/core/rfile.h
+zjit.$(OBJEXT): {$(VPATH)}internal/core/rhash.h
+zjit.$(OBJEXT): {$(VPATH)}internal/core/robject.h
+zjit.$(OBJEXT): {$(VPATH)}internal/core/rregexp.h
+zjit.$(OBJEXT): {$(VPATH)}internal/core/rstring.h
+zjit.$(OBJEXT): {$(VPATH)}internal/core/rstruct.h
+zjit.$(OBJEXT): {$(VPATH)}internal/core/rtypeddata.h
+zjit.$(OBJEXT): {$(VPATH)}internal/ctype.h
+zjit.$(OBJEXT): {$(VPATH)}internal/dllexport.h
+zjit.$(OBJEXT): {$(VPATH)}internal/dosish.h
+zjit.$(OBJEXT): {$(VPATH)}internal/encoding/coderange.h
+zjit.$(OBJEXT): {$(VPATH)}internal/encoding/ctype.h
+zjit.$(OBJEXT): {$(VPATH)}internal/encoding/encoding.h
+zjit.$(OBJEXT): {$(VPATH)}internal/encoding/pathname.h
+zjit.$(OBJEXT): {$(VPATH)}internal/encoding/re.h
+zjit.$(OBJEXT): {$(VPATH)}internal/encoding/sprintf.h
+zjit.$(OBJEXT): {$(VPATH)}internal/encoding/string.h
+zjit.$(OBJEXT): {$(VPATH)}internal/encoding/symbol.h
+zjit.$(OBJEXT): {$(VPATH)}internal/encoding/transcode.h
+zjit.$(OBJEXT): {$(VPATH)}internal/error.h
+zjit.$(OBJEXT): {$(VPATH)}internal/eval.h
+zjit.$(OBJEXT): {$(VPATH)}internal/event.h
+zjit.$(OBJEXT): {$(VPATH)}internal/fl_type.h
+zjit.$(OBJEXT): {$(VPATH)}internal/gc.h
+zjit.$(OBJEXT): {$(VPATH)}internal/glob.h
+zjit.$(OBJEXT): {$(VPATH)}internal/globals.h
+zjit.$(OBJEXT): {$(VPATH)}internal/has/attribute.h
+zjit.$(OBJEXT): {$(VPATH)}internal/has/builtin.h
+zjit.$(OBJEXT): {$(VPATH)}internal/has/c_attribute.h
+zjit.$(OBJEXT): {$(VPATH)}internal/has/cpp_attribute.h
+zjit.$(OBJEXT): {$(VPATH)}internal/has/declspec_attribute.h
+zjit.$(OBJEXT): {$(VPATH)}internal/has/extension.h
+zjit.$(OBJEXT): {$(VPATH)}internal/has/feature.h
+zjit.$(OBJEXT): {$(VPATH)}internal/has/warning.h
+zjit.$(OBJEXT): {$(VPATH)}internal/intern/array.h
+zjit.$(OBJEXT): {$(VPATH)}internal/intern/bignum.h
+zjit.$(OBJEXT): {$(VPATH)}internal/intern/class.h
+zjit.$(OBJEXT): {$(VPATH)}internal/intern/compar.h
+zjit.$(OBJEXT): {$(VPATH)}internal/intern/complex.h
+zjit.$(OBJEXT): {$(VPATH)}internal/intern/cont.h
+zjit.$(OBJEXT): {$(VPATH)}internal/intern/dir.h
+zjit.$(OBJEXT): {$(VPATH)}internal/intern/enum.h
+zjit.$(OBJEXT): {$(VPATH)}internal/intern/enumerator.h
+zjit.$(OBJEXT): {$(VPATH)}internal/intern/error.h
+zjit.$(OBJEXT): {$(VPATH)}internal/intern/eval.h
+zjit.$(OBJEXT): {$(VPATH)}internal/intern/file.h
+zjit.$(OBJEXT): {$(VPATH)}internal/intern/hash.h
+zjit.$(OBJEXT): {$(VPATH)}internal/intern/io.h
+zjit.$(OBJEXT): {$(VPATH)}internal/intern/load.h
+zjit.$(OBJEXT): {$(VPATH)}internal/intern/marshal.h
+zjit.$(OBJEXT): {$(VPATH)}internal/intern/numeric.h
+zjit.$(OBJEXT): {$(VPATH)}internal/intern/object.h
+zjit.$(OBJEXT): {$(VPATH)}internal/intern/parse.h
+zjit.$(OBJEXT): {$(VPATH)}internal/intern/proc.h
+zjit.$(OBJEXT): {$(VPATH)}internal/intern/process.h
+zjit.$(OBJEXT): {$(VPATH)}internal/intern/random.h
+zjit.$(OBJEXT): {$(VPATH)}internal/intern/range.h
+zjit.$(OBJEXT): {$(VPATH)}internal/intern/rational.h
+zjit.$(OBJEXT): {$(VPATH)}internal/intern/re.h
+zjit.$(OBJEXT): {$(VPATH)}internal/intern/ruby.h
+zjit.$(OBJEXT): {$(VPATH)}internal/intern/select.h
+zjit.$(OBJEXT): {$(VPATH)}internal/intern/select/largesize.h
+zjit.$(OBJEXT): {$(VPATH)}internal/intern/set.h
+zjit.$(OBJEXT): {$(VPATH)}internal/intern/signal.h
+zjit.$(OBJEXT): {$(VPATH)}internal/intern/sprintf.h
+zjit.$(OBJEXT): {$(VPATH)}internal/intern/string.h
+zjit.$(OBJEXT): {$(VPATH)}internal/intern/struct.h
+zjit.$(OBJEXT): {$(VPATH)}internal/intern/thread.h
+zjit.$(OBJEXT): {$(VPATH)}internal/intern/time.h
+zjit.$(OBJEXT): {$(VPATH)}internal/intern/variable.h
+zjit.$(OBJEXT): {$(VPATH)}internal/intern/vm.h
+zjit.$(OBJEXT): {$(VPATH)}internal/interpreter.h
+zjit.$(OBJEXT): {$(VPATH)}internal/iterator.h
+zjit.$(OBJEXT): {$(VPATH)}internal/memory.h
+zjit.$(OBJEXT): {$(VPATH)}internal/method.h
+zjit.$(OBJEXT): {$(VPATH)}internal/module.h
+zjit.$(OBJEXT): {$(VPATH)}internal/newobj.h
+zjit.$(OBJEXT): {$(VPATH)}internal/numeric.h
+zjit.$(OBJEXT): {$(VPATH)}internal/scan_args.h
+zjit.$(OBJEXT): {$(VPATH)}internal/special_consts.h
+zjit.$(OBJEXT): {$(VPATH)}internal/static_assert.h
+zjit.$(OBJEXT): {$(VPATH)}internal/stdalign.h
+zjit.$(OBJEXT): {$(VPATH)}internal/stdbool.h
+zjit.$(OBJEXT): {$(VPATH)}internal/stdckdint.h
+zjit.$(OBJEXT): {$(VPATH)}internal/symbol.h
+zjit.$(OBJEXT): {$(VPATH)}internal/value.h
+zjit.$(OBJEXT): {$(VPATH)}internal/value_type.h
+zjit.$(OBJEXT): {$(VPATH)}internal/variable.h
+zjit.$(OBJEXT): {$(VPATH)}internal/warning_push.h
+zjit.$(OBJEXT): {$(VPATH)}internal/xmalloc.h
+zjit.$(OBJEXT): {$(VPATH)}iseq.h
+zjit.$(OBJEXT): {$(VPATH)}method.h
+zjit.$(OBJEXT): {$(VPATH)}missing.h
+zjit.$(OBJEXT): {$(VPATH)}node.h
+zjit.$(OBJEXT): {$(VPATH)}onigmo.h
+zjit.$(OBJEXT): {$(VPATH)}oniguruma.h
+zjit.$(OBJEXT): {$(VPATH)}prism_compile.h
+zjit.$(OBJEXT): {$(VPATH)}probes.dmyh
+zjit.$(OBJEXT): {$(VPATH)}probes.h
+zjit.$(OBJEXT): {$(VPATH)}probes_helper.h
+zjit.$(OBJEXT): {$(VPATH)}ruby_assert.h
+zjit.$(OBJEXT): {$(VPATH)}ruby_atomic.h
+zjit.$(OBJEXT): {$(VPATH)}rubyparser.h
+zjit.$(OBJEXT): {$(VPATH)}shape.h
+zjit.$(OBJEXT): {$(VPATH)}st.h
+zjit.$(OBJEXT): {$(VPATH)}subst.h
+zjit.$(OBJEXT): {$(VPATH)}thread_$(THREAD_MODEL).h
+zjit.$(OBJEXT): {$(VPATH)}thread_native.h
+zjit.$(OBJEXT): {$(VPATH)}vm_callinfo.h
+zjit.$(OBJEXT): {$(VPATH)}vm_core.h
+zjit.$(OBJEXT): {$(VPATH)}vm_debug.h
+zjit.$(OBJEXT): {$(VPATH)}vm_insnhelper.h
+zjit.$(OBJEXT): {$(VPATH)}vm_opts.h
+zjit.$(OBJEXT): {$(VPATH)}vm_sync.h
+zjit.$(OBJEXT): {$(VPATH)}yjit.h
+zjit.$(OBJEXT): {$(VPATH)}zjit.c
+zjit.$(OBJEXT): {$(VPATH)}zjit.h
+zjit.$(OBJEXT): {$(VPATH)}zjit.rbinc
+# AUTOGENERATED DEPENDENCIES END
diff --git a/dir.c b/dir.c
index a090b9f38c..25ed59c668 100644
--- a/dir.c
+++ b/dir.c
@@ -22,10 +22,6 @@
 #include <unistd.h>
 #endif
 
-#ifndef O_CLOEXEC
-#  define O_CLOEXEC 0
-#endif
-
 #ifndef USE_OPENDIR_AT
 # if defined(HAVE_FDOPENDIR) && defined(HAVE_DIRFD) && \
     defined(HAVE_OPENAT) && defined(HAVE_FSTATAT)
@@ -35,8 +31,12 @@
 # endif
 #endif
 
-#if USE_OPENDIR_AT
-# include <fcntl.h>
+#ifdef HAVE_FCNTL_H
+#  include <fcntl.h>
+#endif
+
+#ifndef O_CLOEXEC
+#  define O_CLOEXEC 0
 #endif
 
 #undef HAVE_DIRENT_NAMLEN
@@ -77,9 +77,9 @@ char *strchr(char*,char);
 #endif
 
 #define USE_NAME_ON_FS_REAL_BASENAME 1	/* platform dependent APIs to
-					 * get real basenames */
+                                         * get real basenames */
 #define USE_NAME_ON_FS_BY_FNMATCH 2	/* select the matching
-					 * basename by fnmatch */
+                                         * basename by fnmatch */
 
 #ifdef HAVE_GETATTRLIST
 # define USE_NAME_ON_FS USE_NAME_ON_FS_REAL_BASENAME
@@ -113,6 +113,7 @@ char *strchr(char*,char);
 #include "internal/gc.h"
 #include "internal/io.h"
 #include "internal/object.h"
+#include "internal/imemo.h"
 #include "internal/vm.h"
 #include "ruby/encoding.h"
 #include "ruby/ruby.h"
@@ -142,6 +143,50 @@ char *strchr(char*,char);
 # define IS_WIN32 0
 #endif
 
+#ifdef HAVE_GETATTRLIST
+struct getattrlist_args {
+    const char *path;
+    int fd;
+    struct attrlist *list;
+    void *buf;
+    size_t size;
+    unsigned int options;
+};
+
+# define GETATTRLIST_ARGS(list_, buf_, options_) (struct getattrlist_args) \
+    {.list = list_, .buf = buf_, .size = sizeof(buf_), .options = options_}
+
+static void *
+nogvl_getattrlist(void *args)
+{
+    struct getattrlist_args *arg = args;
+    return (void *)(VALUE)getattrlist(arg->path, arg->list, arg->buf, arg->size, arg->options);
+}
+
+static int
+gvl_getattrlist(struct getattrlist_args *args, const char *path)
+{
+    args->path = path;
+    return IO_WITHOUT_GVL_INT(nogvl_getattrlist, args);
+}
+
+# ifdef HAVE_FGETATTRLIST
+static void *
+nogvl_fgetattrlist(void *args)
+{
+    struct getattrlist_args *arg = args;
+    return (void *)(VALUE)fgetattrlist(arg->fd, arg->list, arg->buf, arg->size, arg->options);
+}
+
+static int
+gvl_fgetattrlist(struct getattrlist_args *args, int fd)
+{
+    args->fd = fd;
+    return IO_WITHOUT_GVL_INT(nogvl_fgetattrlist, args);
+}
+# endif
+#endif
+
 #if NORMALIZE_UTF8PATH
 # if defined HAVE_FGETATTRLIST || !defined HAVE_GETATTRLIST
 #   define need_normalization(dirp, path) need_normalization(dirp)
@@ -154,18 +199,19 @@ need_normalization(DIR *dirp, const char *path)
 # if defined HAVE_FGETATTRLIST || defined HAVE_GETATTRLIST
     u_int32_t attrbuf[SIZEUP32(fsobj_tag_t)];
     struct attrlist al = {ATTR_BIT_MAP_COUNT, 0, ATTR_CMN_OBJTAG,};
+    struct getattrlist_args args = GETATTRLIST_ARGS(&al, attrbuf, 0);
 #   if defined HAVE_FGETATTRLIST
-    int ret = fgetattrlist(dirfd(dirp), &al, attrbuf, sizeof(attrbuf), 0);
+    int ret = gvl_fgetattrlist(&args, dirfd(dirp));
 #   else
-    int ret = getattrlist(path, &al, attrbuf, sizeof(attrbuf), 0);
+    int ret = gvl_getattrlist(&args, path);
 #   endif
     if (!ret) {
-	const fsobj_tag_t *tag = (void *)(attrbuf+1);
-	switch (*tag) {
-	  case VT_HFS:
-	  case VT_CIFS:
-	    return TRUE;
-	}
+        const fsobj_tag_t *tag = (void *)(attrbuf+1);
+        switch (*tag) {
+          case VT_HFS:
+          case VT_CIFS:
+            return TRUE;
+        }
     }
 # endif
     return FALSE;
@@ -175,9 +221,9 @@ static inline int
 has_nonascii(const char *ptr, size_t len)
 {
     while (len > 0) {
-	if (!ISASCII(*ptr)) return 1;
-	ptr++;
-	--len;
+        if (!ISASCII(*ptr)) return 1;
+        ptr++;
+        --len;
     }
     return 0;
 }
@@ -254,53 +300,53 @@ bracket(
 
     if (p >= pend) return NULL;
     if (*p == '!' || *p == '^') {
-	not = 1;
-	p++;
+        not = 1;
+        p++;
     }
 
     while (*p != ']') {
-	const char *t1 = p;
-	if (escape && *t1 == '\\')
-	    t1++;
-	if (!*t1)
-	    return NULL;
-	p = t1 + (r = rb_enc_mbclen(t1, pend, enc));
-	if (p >= pend) return NULL;
-	if (p[0] == '-' && p[1] != ']') {
-	    const char *t2 = p + 1;
-	    int r2;
-	    if (escape && *t2 == '\\')
-		t2++;
-	    if (!*t2)
-		return NULL;
-	    p = t2 + (r2 = rb_enc_mbclen(t2, pend, enc));
-	    if (ok) continue;
-	    if ((r <= (send-s) && memcmp(t1, s, r) == 0) ||
-		(r2 <= (send-s) && memcmp(t2, s, r2) == 0)) {
-		ok = 1;
-		continue;
-	    }
-	    c1 = rb_enc_codepoint(s, send, enc);
-	    if (nocase) c1 = rb_enc_toupper(c1, enc);
-	    c2 = rb_enc_codepoint(t1, pend, enc);
-	    if (nocase) c2 = rb_enc_toupper(c2, enc);
-	    if (c1 < c2) continue;
-	    c2 = rb_enc_codepoint(t2, pend, enc);
-	    if (nocase) c2 = rb_enc_toupper(c2, enc);
-	    if (c1 > c2) continue;
-	}
-	else {
-	    if (ok) continue;
-	    if (r <= (send-s) && memcmp(t1, s, r) == 0) {
-		ok = 1;
-		continue;
-	    }
-	    if (!nocase) continue;
-	    c1 = rb_enc_toupper(rb_enc_codepoint(s, send, enc), enc);
-	    c2 = rb_enc_toupper(rb_enc_codepoint(p, pend, enc), enc);
-	    if (c1 != c2) continue;
-	}
-	ok = 1;
+        const char *t1 = p;
+        if (escape && *t1 == '\\')
+            t1++;
+        if (!*t1)
+            return NULL;
+        p = t1 + (r = rb_enc_mbclen(t1, pend, enc));
+        if (p >= pend) return NULL;
+        if (p[0] == '-' && p[1] != ']') {
+            const char *t2 = p + 1;
+            int r2;
+            if (escape && *t2 == '\\')
+                t2++;
+            if (!*t2)
+                return NULL;
+            p = t2 + (r2 = rb_enc_mbclen(t2, pend, enc));
+            if (ok) continue;
+            if ((r <= (send-s) && memcmp(t1, s, r) == 0) ||
+                (r2 <= (send-s) && memcmp(t2, s, r2) == 0)) {
+                ok = 1;
+                continue;
+            }
+            c1 = rb_enc_codepoint(s, send, enc);
+            if (nocase) c1 = rb_enc_toupper(c1, enc);
+            c2 = rb_enc_codepoint(t1, pend, enc);
+            if (nocase) c2 = rb_enc_toupper(c2, enc);
+            if (c1 < c2) continue;
+            c2 = rb_enc_codepoint(t2, pend, enc);
+            if (nocase) c2 = rb_enc_toupper(c2, enc);
+            if (c1 > c2) continue;
+        }
+        else {
+            if (ok) continue;
+            if (r <= (send-s) && memcmp(t1, s, r) == 0) {
+                ok = 1;
+                continue;
+            }
+            if (!nocase) continue;
+            c1 = rb_enc_toupper(rb_enc_codepoint(s, send, enc), enc);
+            c2 = rb_enc_toupper(rb_enc_codepoint(p, pend, enc), enc);
+            if (c1 != c2) continue;
+        }
+        ok = 1;
     }
 
     return ok == not ? NULL : (char *)p + 1;
@@ -338,72 +384,72 @@ fnmatch_helper(
     int r;
 
     if (period && *s == '.' && *UNESCAPE(p) != '.') /* leading period */
-	RETURN(FNM_NOMATCH);
+        RETURN(FNM_NOMATCH);
 
     while (1) {
-	switch (*p) {
-	  case '*':
-	    do { p++; } while (*p == '*');
-	    if (ISEND(UNESCAPE(p))) {
-		p = UNESCAPE(p);
-		RETURN(0);
-	    }
-	    if (ISEND(s))
-		RETURN(FNM_NOMATCH);
-	    ptmp = p;
-	    stmp = s;
-	    continue;
-
-	  case '?':
-	    if (ISEND(s))
-		RETURN(FNM_NOMATCH);
-	    p++;
-	    Inc(s, send, enc);
-	    continue;
-
-	  case '[': {
-	    const char *t;
-	    if (ISEND(s))
-		RETURN(FNM_NOMATCH);
-	    if ((t = bracket(p + 1, pend, s, send, flags, enc)) != 0) {
-		p = t;
-		Inc(s, send, enc);
-		continue;
-	    }
-	    goto failed;
-	  }
-	}
-
-	/* ordinary */
-	p = UNESCAPE(p);
-	if (ISEND(s))
-	    RETURN(ISEND(p) ? 0 : FNM_NOMATCH);
-	if (ISEND(p))
-	    goto failed;
-	r = rb_enc_precise_mbclen(p, pend, enc);
-	if (!MBCLEN_CHARFOUND_P(r))
-	    goto failed;
-	if (r <= (send-s) && memcmp(p, s, r) == 0) {
-	    p += r;
-	    s += r;
-	    continue;
-	}
-	if (!nocase) goto failed;
-	if (rb_enc_toupper(rb_enc_codepoint(p, pend, enc), enc) !=
-	    rb_enc_toupper(rb_enc_codepoint(s, send, enc), enc))
-	    goto failed;
-	p += r;
-	Inc(s, send, enc);
-	continue;
+        switch (*p) {
+          case '*':
+            do { p++; } while (*p == '*');
+            if (ISEND(UNESCAPE(p))) {
+                p = UNESCAPE(p);
+                RETURN(0);
+            }
+            if (ISEND(s))
+                RETURN(FNM_NOMATCH);
+            ptmp = p;
+            stmp = s;
+            continue;
+
+          case '?':
+            if (ISEND(s))
+                RETURN(FNM_NOMATCH);
+            p++;
+            Inc(s, send, enc);
+            continue;
+
+          case '[': {
+            const char *t;
+            if (ISEND(s))
+                RETURN(FNM_NOMATCH);
+            if ((t = bracket(p + 1, pend, s, send, flags, enc)) != 0) {
+                p = t;
+                Inc(s, send, enc);
+                continue;
+            }
+            goto failed;
+          }
+        }
+
+        /* ordinary */
+        p = UNESCAPE(p);
+        if (ISEND(s))
+            RETURN(ISEND(p) ? 0 : FNM_NOMATCH);
+        if (ISEND(p))
+            goto failed;
+        r = rb_enc_precise_mbclen(p, pend, enc);
+        if (!MBCLEN_CHARFOUND_P(r))
+            goto failed;
+        if (r <= (send-s) && memcmp(p, s, r) == 0) {
+            p += r;
+            s += r;
+            continue;
+        }
+        if (!nocase) goto failed;
+        if (rb_enc_toupper(rb_enc_codepoint(p, pend, enc), enc) !=
+            rb_enc_toupper(rb_enc_codepoint(s, send, enc), enc))
+            goto failed;
+        p += r;
+        Inc(s, send, enc);
+        continue;
 
       failed: /* try next '*' position */
-	if (ptmp && stmp) {
-	    p = ptmp;
-	    Inc(stmp, send, enc); /* !ISEND(*stmp) */
-	    s = stmp;
-	    continue;
-	}
-	RETURN(FNM_NOMATCH);
+        if (ptmp && stmp) {
+            p = ptmp;
+            Inc(stmp, send, enc); /* !ISEND(*stmp) */
+            s = stmp;
+            continue;
+        }
+        RETURN(FNM_NOMATCH);
     }
 }
 
@@ -424,37 +470,37 @@ fnmatch(
     const char *stmp = 0;
 
     if (pathname) {
-	while (1) {
-	    if (p[0] == '*' && p[1] == '*' && p[2] == '/') {
-		do { p += 3; } while (p[0] == '*' && p[1] == '*' && p[2] == '/');
-		ptmp = p;
-		stmp = s;
-	    }
-	    if (fnmatch_helper(&p, &s, flags, enc) == 0) {
-		while (*s && *s != '/') Inc(s, send, enc);
-		if (*p && *s) {
-		    p++;
-		    s++;
-		    continue;
-		}
-		if (!*p && !*s)
-		    return 0;
-	    }
-	    /* failed : try next recursion */
-	    if (ptmp && stmp && !(period && *stmp == '.')) {
-		while (*stmp && *stmp != '/') Inc(stmp, send, enc);
-		if (*stmp) {
-		    p = ptmp;
-		    stmp++;
-		    s = stmp;
-		    continue;
-		}
-	    }
-	    return FNM_NOMATCH;
-	}
+        while (1) {
+            if (p[0] == '*' && p[1] == '*' && p[2] == '/') {
+                do { p += 3; } while (p[0] == '*' && p[1] == '*' && p[2] == '/');
+                ptmp = p;
+                stmp = s;
+            }
+            if (fnmatch_helper(&p, &s, flags, enc) == 0) {
+                while (*s && *s != '/') Inc(s, send, enc);
+                if (*p && *s) {
+                    p++;
+                    s++;
+                    continue;
+                }
+                if (!*p && !*s)
+                    return 0;
+            }
+            /* failed : try next recursion */
+            if (ptmp && stmp && !(period && *stmp == '.')) {
+                while (*stmp && *stmp != '/') Inc(stmp, send, enc);
+                if (*stmp) {
+                    p = ptmp;
+                    stmp++;
+                    s = stmp;
+                    continue;
+                }
+            }
+            return FNM_NOMATCH;
+        }
     }
     else
-	return fnmatch_helper(&p, &s, flags, enc);
+        return fnmatch_helper(&p, &s, flags, enc);
 }
 
 VALUE rb_cDir;
@@ -466,31 +512,26 @@ struct dir_data {
 };
 
 static void
-dir_mark(void *ptr)
-{
-    struct dir_data *dir = ptr;
-    rb_gc_mark(dir->path);
-}
-
-static void
 dir_free(void *ptr)
 {
     struct dir_data *dir = ptr;
 
     if (dir->dir) closedir(dir->dir);
-    xfree(dir);
 }
 
-static size_t
-dir_memsize(const void *ptr)
-{
-    return sizeof(struct dir_data);
-}
+RUBY_REFERENCES(dir_refs) = {
+    RUBY_REF_EDGE(struct dir_data, path),
+    RUBY_REF_END
+};
 
 static const rb_data_type_t dir_data_type = {
     "dir",
-    {dir_mark, dir_free, dir_memsize,},
-    0, 0, RUBY_TYPED_WB_PROTECTED | RUBY_TYPED_FREE_IMMEDIATELY
+    {
+        RUBY_REFS_LIST_PTR(dir_refs),
+        dir_free,
+        NULL, // Nothing allocated externally, so don't need a memsize function
+    },
+    0, NULL, RUBY_TYPED_WB_PROTECTED | RUBY_TYPED_FREE_IMMEDIATELY | RUBY_TYPED_DECL_MARKING | RUBY_TYPED_EMBEDDABLE
 };
 
 static VALUE dir_close(VALUE);
@@ -513,21 +554,40 @@ nogvl_opendir(void *ptr)
 {
     const char *path = ptr;
 
-    return (void *)opendir(path);
+    return opendir(path);
 }
 
 static DIR *
 opendir_without_gvl(const char *path)
 {
     if (vm_initialized) {
-	union { const void *in; void *out; } u;
+        union { const void *in; void *out; } u;
 
-	u.in = path;
+        u.in = path;
 
-	return rb_thread_call_without_gvl(nogvl_opendir, u.out, RUBY_UBF_IO, 0);
+        return IO_WITHOUT_GVL(nogvl_opendir, u.out);
     }
     else
-	return opendir(path);
+        return opendir(path);
+}
+
+static void
+close_dir_data(struct dir_data *dp)
+{
+    if (dp->dir) {
+        if (closedir(dp->dir) < 0) {
+            dp->dir = NULL;
+            rb_sys_fail("closedir");
+        }
+        dp->dir = NULL;
+    }
+}
+
+static void
+check_closedir(DIR *dirp)
+{
+    if (closedir(dirp) < 0)
+        rb_sys_fail("closedir");
 }
 
 static VALUE
@@ -544,30 +604,30 @@ dir_initialize(rb_execution_context_t *ec, VALUE dir, VALUE dirname, VALUE enc)
     dirname = rb_str_dup_frozen(dirname);
 
     TypedData_Get_Struct(dir, struct dir_data, &dir_data_type, dp);
-    if (dp->dir) closedir(dp->dir);
-    dp->dir = NULL;
+    close_dir_data(dp);
     RB_OBJ_WRITE(dir, &dp->path, Qnil);
     dp->enc = fsenc;
     path = RSTRING_PTR(dirname);
     dp->dir = opendir_without_gvl(path);
     if (dp->dir == NULL) {
-	int e = errno;
-	if (rb_gc_for_fd(e)) {
-	    dp->dir = opendir_without_gvl(path);
-	}
+        int e = errno;
+        if (rb_gc_for_fd(e)) {
+            dp->dir = opendir_without_gvl(path);
+        }
 #ifdef HAVE_GETATTRLIST
-	else if (e == EIO) {
-	    u_int32_t attrbuf[1];
-	    struct attrlist al = {ATTR_BIT_MAP_COUNT, 0};
-	    if (getattrlist(path, &al, attrbuf, sizeof(attrbuf), FSOPT_NOFOLLOW) == 0) {
-		dp->dir = opendir_without_gvl(path);
-	    }
-	}
-#endif
-	if (dp->dir == NULL) {
-	    RB_GC_GUARD(dirname);
-	    rb_syserr_fail_path(e, orig);
-	}
+        else if (e == EIO) {
+            u_int32_t attrbuf[1];
+            struct attrlist al = {ATTR_BIT_MAP_COUNT, 0};
+            struct getattrlist_args args = GETATTRLIST_ARGS(&al, attrbuf, FSOPT_NOFOLLOW);
+            if (gvl_getattrlist(&args, path) == 0) {
+                dp->dir = opendir_without_gvl(path);
+            }
+        }
+#endif
+        if (dp->dir == NULL) {
+            RB_GC_GUARD(dirname);
+            rb_syserr_fail_path(e, orig);
+        }
     }
     RB_OBJ_WRITE(dir, &dp->path, orig);
 
@@ -591,6 +651,51 @@ dir_s_close(rb_execution_context_t *ec, VALUE klass, VALUE dir)
     return dir_close(dir);
 }
 
+# if defined(HAVE_FDOPENDIR) && defined(HAVE_DIRFD)
+static void *
+nogvl_fdopendir(void *fd)
+{
+    return fdopendir((int)(VALUE)fd);
+}
+
+/*
+ * call-seq:
+ *   Dir.for_fd(fd) -> dir
+ *
+ * Returns a new \Dir object representing the directory specified by the given
+ * integer directory file descriptor +fd+:
+ *
+ *   d0 = Dir.new('..')
+ *   d1 = Dir.for_fd(d0.fileno)
+ *
+ * Note that the returned +d1+ does not have an associated path:
+ *
+ *   d0.path # => '..'
+ *   d1.path # => nil
+ *
+ * This method uses the
+ * {fdopendir()}[https://www.man7.org/linux/man-pages/man3/fdopendir.3p.html]
+ * function defined by POSIX 2008;
+ * the method is not implemented on non-POSIX platforms (raises NotImplementedError).
+ */
+static VALUE
+dir_s_for_fd(VALUE klass, VALUE fd)
+{
+    struct dir_data *dp;
+    VALUE dir = TypedData_Make_Struct(klass, struct dir_data, &dir_data_type, dp);
+
+    if (!(dp->dir = IO_WITHOUT_GVL(nogvl_fdopendir, (void *)(VALUE)NUM2INT(fd)))) {
+        rb_sys_fail("fdopendir");
+        UNREACHABLE_RETURN(Qnil);
+    }
+
+    RB_OBJ_WRITE(dir, &dp->path, Qnil);
+    return dir;
+}
+#else
+#define dir_s_for_fd rb_f_notimplement
+#endif
+
 NORETURN(static void dir_closed(void));
 
 static void
@@ -618,10 +723,13 @@ dir_check(VALUE dir)
 
 
 /*
- *  call-seq:
- *     dir.inspect -> string
+ * call-seq:
+ *   inspect -> string
+ *
+ * Returns a string description of +self+:
+ *
+ *   Dir.new('example').inspect # => "#<Dir:example>"
  *
- *  Return a string describing this Dir object.
  */
 static VALUE
 dir_inspect(VALUE dir)
@@ -630,12 +738,12 @@ dir_inspect(VALUE dir)
 
     TypedData_Get_Struct(dir, struct dir_data, &dir_data_type, dirp);
     if (!NIL_P(dirp->path)) {
-	VALUE str = rb_str_new_cstr("#<");
-	rb_str_append(str, rb_class_name(CLASS_OF(dir)));
-	rb_str_cat2(str, ":");
-	rb_str_append(str, dirp->path);
-	rb_str_cat2(str, ">");
-	return str;
+        VALUE str = rb_str_new_cstr("#<");
+        rb_str_append(str, rb_class_name(CLASS_OF(dir)));
+        rb_str_cat2(str, ":");
+        rb_str_append(str, dirp->path);
+        rb_str_cat2(str, ">");
+        return str;
     }
     return rb_funcallv(dir, idTo_s, 0, 0);
 }
@@ -655,18 +763,18 @@ dir_inspect(VALUE dir)
 
 #ifdef HAVE_DIRFD
 /*
- *  call-seq:
- *     dir.fileno -> integer
- *
- *  Returns the file descriptor used in <em>dir</em>.
+ * call-seq:
+ *   fileno -> integer
  *
- *     d = Dir.new("..")
- *     d.fileno   #=> 8
+ * Returns the file descriptor used in <em>dir</em>.
  *
- *  This method uses dirfd() function defined by POSIX 2008.
- *  NotImplementedError is raised on other platforms, such as Windows,
- *  which doesn't provide the function.
+ *   d = Dir.new('..')
+ *   d.fileno # => 8
  *
+ * This method uses the
+ * {dirfd()}[https://www.man7.org/linux/man-pages/man3/dirfd.3.html]
+ * function defined by POSIX 2008;
+ * the method is not implemented on non-POSIX platforms (raises NotImplementedError).
  */
 static VALUE
 dir_fileno(VALUE dir)
@@ -677,7 +785,7 @@ dir_fileno(VALUE dir)
     GetDIR(dir, dirp);
     fd = dirfd(dirp->dir);
     if (fd == -1)
-	rb_sys_fail("dirfd");
+        rb_sys_fail("dirfd");
     return INT2NUM(fd);
 }
 #else
@@ -685,14 +793,14 @@ dir_fileno(VALUE dir)
 #endif
 
 /*
- *  call-seq:
- *     dir.path -> string or nil
- *     dir.to_path -> string or nil
+ * call-seq:
+ *   path -> string or nil
  *
- *  Returns the path parameter passed to <em>dir</em>'s constructor.
+ * Returns the +dirpath+ string that was used to create +self+
+ * (or +nil+ if created by method Dir.for_fd):
+ *
+ *   Dir.new('example').path # => "example"
  *
- *     d = Dir.new("..")
- *     d.path   #=> ".."
  */
 static VALUE
 dir_path(VALUE dir)
@@ -709,17 +817,37 @@ static int
 fundamental_encoding_p(rb_encoding *enc)
 {
     switch (rb_enc_to_index(enc)) {
-      case ENCINDEX_ASCII:
+      case ENCINDEX_ASCII_8BIT:
       case ENCINDEX_US_ASCII:
       case ENCINDEX_UTF_8:
-	return TRUE;
+        return TRUE;
       default:
-	return FALSE;
+        return FALSE;
     }
 }
 # define READDIR(dir, enc) rb_w32_readdir((dir), (enc))
+# define READDIR_NOGVL READDIR
 #else
-# define READDIR(dir, enc) readdir((dir))
+NORETURN(static void *sys_failure(void *function));
+static void *
+sys_failure(void *function)
+{
+    rb_sys_fail(function);
+}
+
+static void *
+nogvl_readdir(void *dir)
+{
+    rb_errno_set(0);
+    if ((dir = readdir(dir)) == NULL) {
+        if (rb_errno())
+            rb_thread_call_with_gvl(sys_failure, (void *)"readdir");
+    }
+    return dir;
+}
+
+# define READDIR(dir, enc) IO_WITHOUT_GVL(nogvl_readdir, (void *)(dir))
+# define READDIR_NOGVL(dir, enc) nogvl_readdir((dir))
 #endif
 
 /* safe to use without GVL */
@@ -731,11 +859,11 @@ to_be_skipped(const struct dirent *dp)
 #ifdef HAVE_DIRENT_NAMLEN
     switch (NAMLEN(dp)) {
       case 2:
-	if (name[1] != '.') return FALSE;
+        if (name[1] != '.') return FALSE;
       case 1:
-	return TRUE;
+        return TRUE;
       default:
-	break;
+        break;
     }
 #else
     if (!name[1]) return TRUE;
@@ -746,16 +874,18 @@ to_be_skipped(const struct dirent *dp)
 }
 
 /*
- *  call-seq:
- *     dir.read -> string or nil
+ * call-seq:
+ *   read -> string or nil
  *
- *  Reads the next entry from <em>dir</em> and returns it as a string.
- *  Returns <code>nil</code> at the end of the stream.
+ * Reads and returns the next entry name from +self+;
+ * returns +nil+ if at end-of-stream;
+ * see {Dir As Stream-Like}[rdoc-ref:Dir@Dir+As+Stream-Like]:
+ *
+ *   dir = Dir.new('example')
+ *   dir.read # => "."
+ *   dir.read # => ".."
+ *   dir.read # => "config.h"
  *
- *     d = Dir.new("testdir")
- *     d.read   #=> "."
- *     d.read   #=> ".."
- *     d.read   #=> "config.h"
  */
 static VALUE
 dir_read(VALUE dir)
@@ -764,14 +894,14 @@ dir_read(VALUE dir)
     struct dirent *dp;
 
     GetDIR(dir, dirp);
-    errno = 0;
+    rb_errno_set(0);
     if ((dp = READDIR(dirp->dir, dirp->enc)) != NULL) {
-	return rb_external_str_new_with_enc(dp->d_name, NAMLEN(dp), dirp->enc);
+        return rb_external_str_new_with_enc(dp->d_name, NAMLEN(dp), dirp->enc);
     }
     else {
-	int e = errno;
-	if (e != 0) rb_syserr_fail(e, 0);
-	return Qnil;		/* end of stream */
+        int e = errno;
+        if (e != 0) rb_syserr_fail(e, 0);
+        return Qnil;		/* end of stream */
     }
 }
 
@@ -784,24 +914,23 @@ dir_yield(VALUE arg, VALUE path)
 }
 
 /*
- *  call-seq:
- *     dir.each { |filename| block }  -> dir
- *     dir.each                       -> an_enumerator
+ * call-seq:
+ *   each {|entry_name| ... } -> self
  *
- *  Calls the block once for each entry in this directory, passing the
- *  filename of each entry as a parameter to the block.
+ * Calls the block with each entry name in +self+:
  *
- *  If no block is given, an enumerator is returned instead.
+ *   Dir.new('example').each {|entry_name| p entry_name }
  *
- *     d = Dir.new("testdir")
- *     d.each  {|x| puts "Got #{x}" }
+ * Output:
+
+ *   "."
+ *   ".."
+ *   "config.h"
+ *   "lib"
+ *   "main.rb"
  *
- *  <em>produces:</em>
+ * With no block given, returns an Enumerator.
  *
- *     Got .
- *     Got ..
- *     Got config.h
- *     Got main.rb
  */
 static VALUE
 dir_each(VALUE dir)
@@ -821,39 +950,40 @@ dir_each_entry(VALUE dir, VALUE (*each)(VALUE, VALUE), VALUE arg, int children_o
     rewinddir(dirp->dir);
     IF_NORMALIZE_UTF8PATH(norm_p = need_normalization(dirp->dir, RSTRING_PTR(dirp->path)));
     while ((dp = READDIR(dirp->dir, dirp->enc)) != NULL) {
-	const char *name = dp->d_name;
-	size_t namlen = NAMLEN(dp);
-	VALUE path;
-
-	if (children_only && name[0] == '.') {
-	    if (namlen == 1) continue; /* current directory */
-	    if (namlen == 2 && name[1] == '.') continue; /* parent directory */
-	}
+        const char *name = dp->d_name;
+        size_t namlen = NAMLEN(dp);
+        VALUE path;
+
+        if (children_only && name[0] == '.') {
+            if (namlen == 1) continue; /* current directory */
+            if (namlen == 2 && name[1] == '.') continue; /* parent directory */
+        }
 #if NORMALIZE_UTF8PATH
-	if (norm_p && has_nonascii(name, namlen) &&
-	    !NIL_P(path = rb_str_normalize_ospath(name, namlen))) {
-	    path = rb_external_str_with_enc(path, dirp->enc);
-	}
-	else
+        if (norm_p && has_nonascii(name, namlen) &&
+            !NIL_P(path = rb_str_normalize_ospath(name, namlen))) {
+            path = rb_external_str_with_enc(path, dirp->enc);
+        }
+        else
 #endif
-	path = rb_external_str_new_with_enc(name, namlen, dirp->enc);
-	(*each)(arg, path);
+        path = rb_external_str_new_with_enc(name, namlen, dirp->enc);
+        (*each)(arg, path);
     }
     return dir;
 }
 
 #ifdef HAVE_TELLDIR
 /*
- *  call-seq:
- *     dir.pos -> integer
- *     dir.tell -> integer
+ * call-seq:
+ *   tell -> integer
+ *
+ * Returns the current position of +self+;
+ * see {Dir As Stream-Like}[rdoc-ref:Dir@Dir+As+Stream-Like]:
  *
- *  Returns the current position in <em>dir</em>. See also Dir#seek.
+ *   dir = Dir.new('example')
+ *   dir.tell  # => 0
+ *   dir.read  # => "."
+ *   dir.tell  # => 1
  *
- *     d = Dir.new("testdir")
- *     d.tell   #=> 0
- *     d.read   #=> "."
- *     d.tell   #=> 12
  */
 static VALUE
 dir_tell(VALUE dir)
@@ -862,7 +992,8 @@ dir_tell(VALUE dir)
     long pos;
 
     GetDIR(dir, dirp);
-    pos = telldir(dirp->dir);
+    if((pos = telldir(dirp->dir)) < 0)
+        rb_sys_fail("telldir");
     return rb_int2inum(pos);
 }
 #else
@@ -871,18 +1002,24 @@ dir_tell(VALUE dir)
 
 #ifdef HAVE_SEEKDIR
 /*
- *  call-seq:
- *     dir.seek( integer ) -> dir
- *
- *  Seeks to a particular location in <em>dir</em>. <i>integer</i>
- *  must be a value returned by Dir#tell.
- *
- *     d = Dir.new("testdir")   #=> #<Dir:0x401b3c40>
- *     d.read                   #=> "."
- *     i = d.tell               #=> 12
- *     d.read                   #=> ".."
- *     d.seek(i)                #=> #<Dir:0x401b3c40>
- *     d.read                   #=> ".."
+ * call-seq:
+ *   seek(position) -> self
+ *
+ * Sets the position in +self+ and returns +self+.
+ * The value of +position+ should have been returned from an earlier call to #tell;
+ * if not, the return values from subsequent calls to #read are unspecified.
+ *
+ * See {Dir As Stream-Like}[rdoc-ref:Dir@Dir+As+Stream-Like].
+ *
+ * Examples:
+ *
+ *   dir = Dir.new('example')
+ *   dir.pos      # => 0
+ *   dir.seek(3)  # => #<Dir:example>
+ *   dir.pos      # => 3
+ *   dir.seek(30) # => #<Dir:example>
+ *   dir.pos      # => 5
+ *
  */
 static VALUE
 dir_seek(VALUE dir, VALUE pos)
@@ -900,17 +1037,24 @@ dir_seek(VALUE dir, VALUE pos)
 
 #ifdef HAVE_SEEKDIR
 /*
- *  call-seq:
- *     dir.pos = integer  -> integer
+ * call-seq:
+ *   pos = position -> integer
+ *
+ * Sets the position in +self+ and returns +position+.
+ * The value of +position+ should have been returned from an earlier call to #tell;
+ * if not, the return values from subsequent calls to #read are unspecified.
  *
- *  Synonym for Dir#seek, but returns the position parameter.
+ * See {Dir As Stream-Like}[rdoc-ref:Dir@Dir+As+Stream-Like].
+ *
+ * Examples:
+ *
+ *   dir = Dir.new('example')
+ *   dir.pos      # => 0
+ *   dir.pos = 3  # => 3
+ *   dir.pos      # => 3
+ *   dir.pos = 30 # => 30
+ *   dir.pos      # => 5
  *
- *     d = Dir.new("testdir")   #=> #<Dir:0x401b3c40>
- *     d.read                   #=> "."
- *     i = d.pos                #=> 12
- *     d.read                   #=> ".."
- *     d.pos = i                #=> 12
- *     d.read                   #=> ".."
  */
 static VALUE
 dir_set_pos(VALUE dir, VALUE pos)
@@ -923,15 +1067,19 @@ dir_set_pos(VALUE dir, VALUE pos)
 #endif
 
 /*
- *  call-seq:
- *     dir.rewind -> dir
+ * call-seq:
+ *   rewind -> self
  *
- *  Repositions <em>dir</em> to the first entry.
+ * Sets the position in +self+ to zero;
+ * see {Dir As Stream-Like}[rdoc-ref:Dir@Dir+As+Stream-Like]:
+ *
+ *   dir = Dir.new('example')
+ *   dir.read    # => "."
+ *   dir.read    # => ".."
+ *   dir.pos     # => 2
+ *   dir.rewind  # => #<Dir:example>
+ *   dir.pos     # => 0
  *
- *     d = Dir.new("testdir")
- *     d.read     #=> "."
- *     d.rewind   #=> #<Dir:0x401b3fb0>
- *     d.read     #=> "."
  */
 static VALUE
 dir_rewind(VALUE dir)
@@ -944,14 +1092,18 @@ dir_rewind(VALUE dir)
 }
 
 /*
- *  call-seq:
- *     dir.close -> nil
+ * call-seq:
+ *   close -> nil
+ *
+ * Closes the stream in +self+, if it is open, and returns +nil+;
+ * ignored if +self+ is already closed:
  *
- *  Closes the directory stream.
- *  Calling this method on closed Dir object is ignored since Ruby 2.3.
+ *   dir = Dir.new('example')
+ *   dir.read     # => "."
+ *   dir.close     # => nil
+ *   dir.close     # => nil
+ *   dir.read # Raises IOError.
  *
- *     d = Dir.new("testdir")
- *     d.close   #=> nil
  */
 static VALUE
 dir_close(VALUE dir)
@@ -960,8 +1112,7 @@ dir_close(VALUE dir)
 
     dirp = dir_get(dir);
     if (!dirp->dir) return Qnil;
-    closedir(dirp->dir);
-    dirp->dir = NULL;
+    close_dir_data(dirp);
 
     return Qnil;
 }
@@ -975,30 +1126,80 @@ nogvl_chdir(void *ptr)
 }
 
 static void
-dir_chdir(VALUE path)
+dir_chdir0(VALUE path)
 {
-    if (chdir(RSTRING_PTR(path)) < 0)
-	rb_sys_fail_path(path);
+    if (IO_WITHOUT_GVL_INT(nogvl_chdir, (void*)RSTRING_PTR(path)) < 0)
+        rb_sys_fail_path(path);
 }
 
-static int chdir_blocking = 0;
-static VALUE chdir_thread = Qnil;
+static struct {
+    VALUE thread;
+    VALUE path;
+    int line;
+    int blocking;
+} chdir_lock = {
+    .blocking = 0, .thread = Qnil,
+    .path = Qnil, .line = 0,
+};
+
+static void
+chdir_enter(void)
+{
+    if (chdir_lock.blocking == 0) {
+        chdir_lock.path = rb_source_location(&chdir_lock.line);
+    }
+    chdir_lock.blocking++;
+    if (NIL_P(chdir_lock.thread)) {
+        chdir_lock.thread = rb_thread_current();
+    }
+}
+
+static void
+chdir_leave(void)
+{
+    chdir_lock.blocking--;
+    if (chdir_lock.blocking == 0) {
+        chdir_lock.thread = Qnil;
+        chdir_lock.path = Qnil;
+        chdir_lock.line = 0;
+    }
+}
+
+static int
+chdir_alone_block_p(void)
+{
+    int block_given = rb_block_given_p();
+    if (chdir_lock.blocking > 0) {
+        if (rb_thread_current() != chdir_lock.thread)
+            rb_raise(rb_eRuntimeError, "conflicting chdir during another chdir block");
+        if (!block_given) {
+            if (!NIL_P(chdir_lock.path)) {
+                rb_warn("conflicting chdir during another chdir block\n"
+                        "%" PRIsVALUE ":%d: note: previous chdir was here",
+                        chdir_lock.path, chdir_lock.line);
+            }
+            else {
+                rb_warn("conflicting chdir during another chdir block");
+            }
+        }
+    }
+    return block_given;
+}
 
 struct chdir_data {
     VALUE old_path, new_path;
     int done;
+    bool yield_path;
 };
 
 static VALUE
 chdir_yield(VALUE v)
 {
     struct chdir_data *args = (void *)v;
-    dir_chdir(args->new_path);
+    dir_chdir0(args->new_path);
     args->done = TRUE;
-    chdir_blocking++;
-    if (NIL_P(chdir_thread))
-	chdir_thread = rb_thread_current();
-    return rb_yield(args->new_path);
+    chdir_enter();
+    return args->yield_path ? rb_yield(args->new_path) : rb_yield_values2(0, NULL);
 }
 
 static VALUE
@@ -1006,53 +1207,96 @@ chdir_restore(VALUE v)
 {
     struct chdir_data *args = (void *)v;
     if (args->done) {
-	chdir_blocking--;
-	if (chdir_blocking == 0)
-	    chdir_thread = Qnil;
-	dir_chdir(args->old_path);
+        chdir_leave();
+        dir_chdir0(args->old_path);
     }
     return Qnil;
 }
 
+static VALUE
+chdir_path(VALUE path, bool yield_path)
+{
+    if (chdir_alone_block_p()) {
+        struct chdir_data args;
+
+        args.old_path = rb_str_encode_ospath(rb_dir_getwd());
+        args.new_path = path;
+        args.done = FALSE;
+        args.yield_path = yield_path;
+        return rb_ensure(chdir_yield, (VALUE)&args, chdir_restore, (VALUE)&args);
+    }
+    else {
+        char *p = RSTRING_PTR(path);
+        int r = IO_WITHOUT_GVL_INT(nogvl_chdir, p);
+        if (r < 0)
+            rb_sys_fail_path(path);
+    }
+
+    return INT2FIX(0);
+}
+
 /*
- *  call-seq:
- *     Dir.chdir( [ string] ) -> 0
- *     Dir.chdir( [ string] ) {| path | block }  -> anObject
- *
- *  Changes the current working directory of the process to the given
- *  string. When called without an argument, changes the directory to
- *  the value of the environment variable <code>HOME</code>, or
- *  <code>LOGDIR</code>. SystemCallError (probably Errno::ENOENT) if
- *  the target directory does not exist.
- *
- *  If a block is given, it is passed the name of the new current
- *  directory, and the block is executed with that as the current
- *  directory. The original working directory is restored when the block
- *  exits. The return value of <code>chdir</code> is the value of the
- *  block. <code>chdir</code> blocks can be nested, but in a
- *  multi-threaded program an error will be raised if a thread attempts
- *  to open a <code>chdir</code> block while another thread has one
- *  open or a call to <code>chdir</code> without a block occurs inside
- *  a block passed to <code>chdir</code> (even in the same thread).
- *
- *     Dir.chdir("/var/spool/mail")
- *     puts Dir.pwd
- *     Dir.chdir("/tmp") do
- *       puts Dir.pwd
- *       Dir.chdir("/usr") do
- *         puts Dir.pwd
- *       end
- *       puts Dir.pwd
+ * call-seq:
+ *   Dir.chdir(new_dirpath) -> 0
+ *   Dir.chdir -> 0
+ *   Dir.chdir(new_dirpath) {|new_dirpath| ... } -> object
+ *   Dir.chdir {|cur_dirpath| ... } -> object
+ *
+ * Changes the current working directory.
+ *
+ * With argument +new_dirpath+ and no block,
+ * changes to the given +dirpath+:
+ *
+ *   Dir.pwd         # => "/example"
+ *   Dir.chdir('..') # => 0
+ *   Dir.pwd         # => "/"
+ *
+ * With no argument and no block:
+ *
+ * - Changes to the value of environment variable +HOME+ if defined.
+ * - Otherwise changes to the value of environment variable +LOGDIR+ if defined.
+ * - Otherwise makes no change.
+ *
+ * With argument +new_dirpath+ and a block, temporarily changes the working directory:
+ *
+ * - Calls the block with the argument.
+ * - Changes to the given directory.
+ * - Executes the block (yielding the new path).
+ * - Restores the previous working directory.
+ * - Returns the block's return value.
+ *
+ * Example:
+ *
+ *   Dir.chdir('/var/spool/mail')
+ *   Dir.pwd   # => "/var/spool/mail"
+ *   Dir.chdir('/tmp') do
+ *     Dir.pwd # => "/tmp"
+ *   end
+ *   Dir.pwd   # => "/var/spool/mail"
+ *
+ * With no argument and a block,
+ * calls the block with the current working directory (string)
+ * and returns the block's return value.
+ *
+ * Calls to \Dir.chdir with blocks may be nested:
+ *
+ *   Dir.chdir('/var/spool/mail')
+ *   Dir.pwd     # => "/var/spool/mail"
+ *   Dir.chdir('/tmp') do
+ *     Dir.pwd   # => "/tmp"
+ *     Dir.chdir('/usr') do
+ *       Dir.pwd # => "/usr"
  *     end
- *     puts Dir.pwd
+ *     Dir.pwd   # => "/tmp"
+ *   end
+ *   Dir.pwd     # => "/var/spool/mail"
  *
- *  <em>produces:</em>
+ * In a multi-threaded program an error is raised if a thread attempts
+ * to open a +chdir+ block while another thread has one open,
+ * or a call to +chdir+ without a block occurs inside
+ * a block passed to +chdir+ (even in the same thread).
  *
- *     /var/spool/mail
- *     /tmp
- *     /usr
- *     /tmp
- *     /var/spool/mail
+ * Raises an exception if the target directory does not exist.
  */
 static VALUE
 dir_s_chdir(int argc, VALUE *argv, VALUE obj)
@@ -1063,39 +1307,170 @@ dir_s_chdir(int argc, VALUE *argv, VALUE obj)
         path = rb_str_encode_ospath(rb_get_path(argv[0]));
     }
     else {
-	const char *dist = getenv("HOME");
-	if (!dist) {
-	    dist = getenv("LOGDIR");
-	    if (!dist) rb_raise(rb_eArgError, "HOME/LOGDIR not set");
-	}
-	path = rb_str_new2(dist);
+        const char *dist = getenv("HOME");
+        if (!dist) {
+            dist = getenv("LOGDIR");
+            if (!dist) rb_raise(rb_eArgError, "HOME/LOGDIR not set");
+        }
+        path = rb_str_new2(dist);
     }
 
-    if (chdir_blocking > 0) {
-	if (rb_thread_current() != chdir_thread)
-            rb_raise(rb_eRuntimeError, "conflicting chdir during another chdir block");
-        if (!rb_block_given_p())
-            rb_warn("conflicting chdir during another chdir block");
+    return chdir_path(path, true);
+}
+
+#if defined(HAVE_FCHDIR) && defined(HAVE_DIRFD) && HAVE_FCHDIR && HAVE_DIRFD
+static void *
+nogvl_fchdir(void *ptr)
+{
+    const int *fd = ptr;
+
+    return (void *)(VALUE)fchdir(*fd);
+}
+
+static void
+dir_fchdir(int fd)
+{
+    if (IO_WITHOUT_GVL_INT(nogvl_fchdir, (void *)&fd) < 0)
+        rb_sys_fail("fchdir");
+}
+
+struct fchdir_data {
+    VALUE old_dir;
+    int fd;
+    int done;
+};
+
+static VALUE
+fchdir_yield(VALUE v)
+{
+    struct fchdir_data *args = (void *)v;
+    dir_fchdir(args->fd);
+    args->done = TRUE;
+    chdir_enter();
+    return rb_yield_values(0);
+}
+
+static VALUE
+fchdir_restore(VALUE v)
+{
+    struct fchdir_data *args = (void *)v;
+    if (args->done) {
+        chdir_leave();
+        dir_fchdir(RB_NUM2INT(dir_fileno(args->old_dir)));
     }
+    dir_close(args->old_dir);
+    return Qnil;
+}
 
-    if (rb_block_given_p()) {
-	struct chdir_data args;
+/*
+ * call-seq:
+ *   Dir.fchdir(fd) -> 0
+ *   Dir.fchdir(fd) { ... } -> object
+ *
+ * Changes the current working directory to the directory
+ * specified by the integer file descriptor +fd+.
+ *
+ * When passing a file descriptor over a UNIX socket or to a child process,
+ * using +fchdir+ instead of +chdir+ avoids the
+ * {time-of-check to time-of-use vulnerability}[https://en.wikipedia.org/wiki/Time-of-check_to_time-of-use]
+ *
+ * With no block, changes to the directory given by +fd+:
+ *
+ *   Dir.chdir('/var/spool/mail')
+ *   Dir.pwd # => "/var/spool/mail"
+ *   dir  = Dir.new('/usr')
+ *   fd = dir.fileno
+ *   Dir.fchdir(fd)
+ *   Dir.pwd # => "/usr"
+ *
+ * With a block, temporarily changes the working directory:
+ *
+ * - Calls the block with the argument.
+ * - Changes to the given directory.
+ * - Executes the block (yields no args).
+ * - Restores the previous working directory.
+ * - Returns the block's return value.
+ *
+ * Example:
+ *
+ *   Dir.chdir('/var/spool/mail')
+ *   Dir.pwd # => "/var/spool/mail"
+ *   dir  = Dir.new('/tmp')
+ *   fd = dir.fileno
+ *   Dir.fchdir(fd) do
+ *     Dir.pwd # => "/tmp"
+ *   end
+ *   Dir.pwd # => "/var/spool/mail"
+ *
+ * This method uses the
+ * {fchdir()}[https://www.man7.org/linux/man-pages/man3/fchdir.3p.html]
+ * function defined by POSIX 2008;
+ * the method is not implemented on non-POSIX platforms (raises NotImplementedError).
+ *
+ * Raises an exception if the file descriptor is not valid.
+ *
+ * In a multi-threaded program an error is raised if a thread attempts
+ * to open a +chdir+ block while another thread has one open,
+ * or a call to +chdir+ without a block occurs inside
+ * a block passed to +chdir+ (even in the same thread).
+ */
+static VALUE
+dir_s_fchdir(VALUE klass, VALUE fd_value)
+{
+    int fd = RB_NUM2INT(fd_value);
 
-	args.old_path = rb_str_encode_ospath(rb_dir_getwd());
-	args.new_path = path;
-	args.done = FALSE;
-	return rb_ensure(chdir_yield, (VALUE)&args, chdir_restore, (VALUE)&args);
+    if (chdir_alone_block_p()) {
+        struct fchdir_data args;
+        args.old_dir = dir_s_alloc(klass);
+        dir_initialize(NULL, args.old_dir, rb_fstring_cstr("."), Qnil);
+        args.fd = fd;
+        args.done = FALSE;
+        return rb_ensure(fchdir_yield, (VALUE)&args, fchdir_restore, (VALUE)&args);
     }
     else {
-	char *p = RSTRING_PTR(path);
-	int r = (int)(VALUE)rb_thread_call_without_gvl(nogvl_chdir, p,
-							RUBY_UBF_IO, 0);
-	if (r < 0)
-	    rb_sys_fail_path(path);
+        int r = IO_WITHOUT_GVL_INT(nogvl_fchdir, &fd);
+        if (r < 0)
+            rb_sys_fail("fchdir");
     }
 
     return INT2FIX(0);
 }
+#else
+#define dir_s_fchdir rb_f_notimplement
+#endif
+
+/*
+ * call-seq:
+ *   chdir -> 0
+ *   chdir { ... } -> object
+ *
+ * Changes the current working directory to +self+:
+ *
+ *   Dir.pwd # => "/"
+ *   dir = Dir.new('example')
+ *   dir.chdir
+ *   Dir.pwd # => "/example"
+ *
+ * With a block, temporarily changes the working directory:
+ *
+ * - Calls the block.
+ * - Changes to the given directory.
+ * - Executes the block (yields no args).
+ * - Restores the previous working directory.
+ * - Returns the block's return value.
+ *
+ * Uses Dir.fchdir if available, and Dir.chdir if not, see those
+ * methods for caveats.
+ */
+static VALUE
+dir_chdir(VALUE dir)
+{
+#if defined(HAVE_FCHDIR) && defined(HAVE_DIRFD) && HAVE_FCHDIR && HAVE_DIRFD
+    return dir_s_fchdir(rb_cDir, dir_fileno(dir));
+#else
+    return chdir_path(dir_get(dir)->path, false);
+#endif
+}
 
 #ifndef _WIN32
 VALUE
@@ -1105,19 +1480,15 @@ rb_dir_getwd_ospath(void)
     VALUE cwd;
     VALUE path_guard;
 
-#undef RUBY_UNTYPED_DATA_WARNING
-#define RUBY_UNTYPED_DATA_WARNING 0
-    path_guard = Data_Wrap_Struct((VALUE)0, NULL, RUBY_DEFAULT_FREE, NULL);
+    path_guard = rb_imemo_tmpbuf_new();
     path = ruby_getcwd();
-    DATA_PTR(path_guard) = path;
+    rb_imemo_tmpbuf_set_ptr(path_guard, path);
 #ifdef __APPLE__
     cwd = rb_str_normalize_ospath(path, strlen(path));
 #else
     cwd = rb_str_new2(path);
 #endif
-    DATA_PTR(path_guard) = 0;
-
-    xfree(path);
+    rb_free_tmp_buffer(&path_guard);
     return cwd;
 }
 #endif
@@ -1131,28 +1502,26 @@ rb_dir_getwd(void)
 
     switch (fsenc) {
       case ENCINDEX_US_ASCII:
-	fsenc = ENCINDEX_ASCII;
-      case ENCINDEX_ASCII:
-	break;
+        fsenc = ENCINDEX_ASCII_8BIT;
+      case ENCINDEX_ASCII_8BIT:
+        break;
 #if defined _WIN32 || defined __APPLE__
       default:
-	return rb_str_conv_enc(cwd, NULL, fs);
+        return rb_str_conv_enc(cwd, NULL, fs);
 #endif
     }
     return rb_enc_associate_index(cwd, fsenc);
 }
 
 /*
- *  call-seq:
- *     Dir.getwd -> string
- *     Dir.pwd -> string
+ * call-seq:
+ *   Dir.pwd -> string
+ *
+ * Returns the path to the current working directory:
  *
- *  Returns the path to the current working directory of this process as
- *  a string.
+ *   Dir.chdir("/tmp") # => 0
+ *   Dir.pwd           # => "/tmp"
  *
- *     Dir.chdir("/tmp")   #=> 0
- *     Dir.getwd           #=> "/tmp"
- *     Dir.pwd             #=> "/tmp"
  */
 static VALUE
 dir_s_getwd(VALUE dir)
@@ -1174,28 +1543,37 @@ check_dirname(VALUE dir)
     pend = path + len;
     pend = rb_enc_path_end(rb_enc_path_skip_prefix(path, pend, enc), pend, enc);
     if (pend - path < len) {
-	d = rb_str_subseq(d, 0, pend - path);
-	StringValueCStr(d);
+        d = rb_str_subseq(d, 0, pend - path);
+        StringValueCStr(d);
     }
     return rb_str_encode_ospath(d);
 }
 
 #if defined(HAVE_CHROOT)
+static void *
+nogvl_chroot(void *dirname)
+{
+    return (void *)(VALUE)chroot((const char *)dirname);
+}
+
 /*
- *  call-seq:
- *     Dir.chroot( string ) -> 0
+ * call-seq:
+ *   Dir.chroot(dirpath) -> 0
+ *
+ * Changes the root directory of the calling process to that specified in +dirpath+.
+ * The new root directory is used for pathnames beginning with <tt>'/'</tt>.
+ * The root directory is inherited by all children of the calling process.
  *
- *  Changes this process's idea of the file system root. Only a
- *  privileged process may make this call. Not available on all
- *  platforms. On Unix systems, see <code>chroot(2)</code> for more
- *  information.
+ * Only a privileged process may call +chroot+.
+ *
+ * See {Linux chroot}[https://man7.org/linux/man-pages/man2/chroot.2.html].
  */
 static VALUE
 dir_s_chroot(VALUE dir, VALUE path)
 {
     path = check_dirname(path);
-    if (chroot(RSTRING_PTR(path)) == -1)
-	rb_sys_fail_path(path);
+    if (IO_WITHOUT_GVL_INT(nogvl_chroot, (void *)RSTRING_PTR(path)) == -1)
+        rb_sys_fail_path(path);
 
     return INT2FIX(0);
 }
@@ -1217,18 +1595,20 @@ nogvl_mkdir(void *ptr)
 }
 
 /*
- *  call-seq:
- *     Dir.mkdir( string [, integer] ) -> 0
+ * call-seq:
+ *   Dir.mkdir(dirpath, permissions = 0775) -> 0
  *
- *  Makes a new directory named by <i>string</i>, with permissions
- *  specified by the optional parameter <i>anInteger</i>. The
- *  permissions may be modified by the value of File::umask, and are
- *  ignored on NT. Raises a SystemCallError if the directory cannot be
- *  created. See also the discussion of permissions in the class
- *  documentation for File.
+ * Creates a directory in the underlying file system
+ * at +dirpath+ with the given +permissions+;
+ * returns zero:
  *
- *    Dir.mkdir(File.join(Dir.home, ".foo"), 0700) #=> 0
+ *   Dir.mkdir('foo')
+ *   File.stat(Dir.new('foo')).mode.to_s(8)[1..4] # => "0755"
+ *   Dir.mkdir('bar', 0644)
+ *   File.stat(Dir.new('bar')).mode.to_s(8)[1..4] # => "0644"
  *
+ * See {File Permissions}[rdoc-ref:File@File+Permissions].
+ * Note that argument +permissions+ is ignored on Windows.
  */
 static VALUE
 dir_s_mkdir(int argc, VALUE *argv, VALUE obj)
@@ -1238,17 +1618,17 @@ dir_s_mkdir(int argc, VALUE *argv, VALUE obj)
     int r;
 
     if (rb_scan_args(argc, argv, "11", &path, &vmode) == 2) {
-	m.mode = NUM2MODET(vmode);
+        m.mode = NUM2MODET(vmode);
     }
     else {
-	m.mode = 0777;
+        m.mode = 0777;
     }
 
     path = check_dirname(path);
     m.path = RSTRING_PTR(path);
-    r = (int)(VALUE)rb_thread_call_without_gvl(nogvl_mkdir, &m, RUBY_UBF_IO, 0);
+    r = IO_WITHOUT_GVL_INT(nogvl_mkdir, &m);
     if (r < 0)
-	rb_sys_fail_path(path);
+        rb_sys_fail_path(path);
 
     return INT2FIX(0);
 }
@@ -1262,13 +1642,14 @@ nogvl_rmdir(void *ptr)
 }
 
 /*
- *  call-seq:
- *     Dir.delete( string ) -> 0
- *     Dir.rmdir( string ) -> 0
- *     Dir.unlink( string ) -> 0
+ * call-seq:
+ *   Dir.rmdir(dirpath) -> 0
  *
- *  Deletes the named directory. Raises a subclass of SystemCallError
- *  if the directory isn't empty.
+ * Removes the directory at +dirpath+ from the underlying file system:
+ *
+ *   Dir.rmdir('foo') # => 0
+ *
+ * Raises an exception if the directory is not empty.
  */
 static VALUE
 dir_s_rmdir(VALUE obj, VALUE dir)
@@ -1278,9 +1659,9 @@ dir_s_rmdir(VALUE obj, VALUE dir)
 
     dir = check_dirname(dir);
     p = RSTRING_PTR(dir);
-    r = (int)(VALUE)rb_thread_call_without_gvl(nogvl_rmdir, (void *)p, RUBY_UBF_IO, 0);
+    r = IO_WITHOUT_GVL_INT(nogvl_rmdir, (void *)p);
     if (r < 0)
-	rb_sys_fail_path(dir);
+        rb_sys_fail_path(dir);
 
     return INT2FIX(0);
 }
@@ -1368,11 +1749,11 @@ to_be_ignored(int e)
 }
 
 #ifdef _WIN32
-#define STAT(p, s)	rb_w32_ustati128((p), (s))
-#undef lstat
-#define lstat(p, s)	rb_w32_ulstati128((p), (s))
+#define STAT(args)	(int)(VALUE)nogvl_stat(&(args))
+#define LSTAT(args)	(int)(VALUE)nogvl_lstat(&(args))
 #else
-#define STAT(p, s)	stat((p), (s))
+#define STAT(args)	IO_WITHOUT_GVL_INT(nogvl_stat, (void *)&(args))
+#define LSTAT(args)	IO_WITHOUT_GVL_INT(nogvl_lstat, (void *)&(args))
 #endif
 
 typedef int ruby_glob_errfunc(const char*, VALUE, const void*, int);
@@ -1386,39 +1767,92 @@ at_subpath(int fd, size_t baselen, const char *path)
 {
 #if USE_OPENDIR_AT
     if (fd != (int)AT_FDCWD && baselen > 0) {
-	path += baselen;
-	if (*path == '/') ++path;
+        path += baselen;
+        if (*path == '/') ++path;
     }
 #endif
     return *path ? path : ".";
 }
 
+#if USE_OPENDIR_AT
+struct fstatat_args {
+    int fd;
+    int flag;
+    const char *path;
+    struct stat *pst;
+};
+
+static void *
+nogvl_fstatat(void *args)
+{
+    struct fstatat_args *arg = (struct fstatat_args *)args;
+    return (void *)(VALUE)fstatat(arg->fd, arg->path, arg->pst, arg->flag);
+}
+#else
+struct stat_args {
+    const char *path;
+    struct stat *pst;
+};
+
+static void *
+nogvl_stat(void *args)
+{
+    struct stat_args *arg = (struct stat_args *)args;
+    return (void *)(VALUE)stat(arg->path, arg->pst);
+}
+#endif
+
 /* System call with warning */
 static int
 do_stat(int fd, size_t baselen, const char *path, struct stat *pst, int flags, rb_encoding *enc)
 {
 #if USE_OPENDIR_AT
-    int ret = fstatat(fd, at_subpath(fd, baselen, path), pst, 0);
+    struct fstatat_args args;
+    args.fd = fd;
+    args.path = path;
+    args.pst = pst;
+    args.flag = 0;
+    int ret = IO_WITHOUT_GVL_INT(nogvl_fstatat, (void *)&args);
 #else
-    int ret = STAT(path, pst);
+    struct stat_args args;
+    args.path = path;
+    args.pst = pst;
+    int ret = STAT(args);
 #endif
     if (ret < 0 && !to_be_ignored(errno))
-	sys_warning(path, enc);
+        sys_warning(path, enc);
 
     return ret;
 }
 
 #if defined HAVE_LSTAT || defined lstat || USE_OPENDIR_AT
+#if !USE_OPENDIR_AT
+static void *
+nogvl_lstat(void *args)
+{
+    struct stat_args *arg = (struct stat_args *)args;
+    return (void *)(VALUE)lstat(arg->path, arg->pst);
+}
+#endif
+
 static int
 do_lstat(int fd, size_t baselen, const char *path, struct stat *pst, int flags, rb_encoding *enc)
 {
 #if USE_OPENDIR_AT
-    int ret = fstatat(fd, at_subpath(fd, baselen, path), pst, AT_SYMLINK_NOFOLLOW);
+    struct fstatat_args args;
+    args.fd = fd;
+    args.path = path;
+    args.pst = pst;
+    args.flag = AT_SYMLINK_NOFOLLOW;
+    int ret = IO_WITHOUT_GVL_INT(nogvl_fstatat, (void *)&args);
 #else
-    int ret = lstat(path, pst);
+    struct stat_args args;
+    args.path = path;
+    args.pst = pst;
+    int ret = LSTAT(args);
 #endif
     if (ret < 0 && !to_be_ignored(errno))
-	sys_warning(path, enc);
+        sys_warning(path, enc);
 
     return ret;
 }
@@ -1443,9 +1877,9 @@ static int
 gc_for_fd_with_gvl(int e)
 {
     if (vm_initialized)
-	return (int)(VALUE)rb_thread_call_with_gvl(with_gvl_gc_for_fd, &e);
+        return (int)(VALUE)rb_thread_call_with_gvl(with_gvl_gc_for_fd, &e);
     else
-	return RBOOL(rb_gc_for_fd(e));
+        return RBOOL(rb_gc_for_fd(e));
 }
 
 static void *
@@ -1457,32 +1891,32 @@ nogvl_opendir_at(void *ptr)
 #if USE_OPENDIR_AT
     const int opendir_flags = (O_RDONLY|O_CLOEXEC|
 #  ifdef O_DIRECTORY
-			       O_DIRECTORY|
+                               O_DIRECTORY|
 #  endif /* O_DIRECTORY */
-			       0);
+                               0);
     int fd = openat(oaa->basefd, oaa->path, opendir_flags);
 
     dirp = fd >= 0 ? fdopendir(fd) : 0;
     if (!dirp) {
-	int e = errno;
-
-	switch (gc_for_fd_with_gvl(e)) {
-	  default:
-	    if (fd < 0) fd = openat(oaa->basefd, oaa->path, opendir_flags);
-	    if (fd >= 0) dirp = fdopendir(fd);
-	    if (dirp) return dirp;
-
-	    e = errno;
-	    /* fallthrough*/
-	  case 0:
-	    if (fd >= 0) close(fd);
-	    errno = e;
-	}
+        int e = errno;
+
+        switch (gc_for_fd_with_gvl(e)) {
+          default:
+            if (fd < 0) fd = openat(oaa->basefd, oaa->path, opendir_flags);
+            if (fd >= 0) dirp = fdopendir(fd);
+            if (dirp) return dirp;
+
+            e = errno;
+            /* fallthrough*/
+          case 0:
+            if (fd >= 0) close(fd);
+            rb_errno_set(e);
+        }
     }
 #else  /* !USE_OPENDIR_AT */
     dirp = opendir(oaa->path);
     if (!dirp && gc_for_fd_with_gvl(errno))
-	dirp = opendir(oaa->path);
+        dirp = opendir(oaa->path);
 #endif /* !USE_OPENDIR_AT */
 
     return dirp;
@@ -1497,37 +1931,37 @@ opendir_at(int basefd, const char *path)
     oaa.path = path;
 
     if (vm_initialized)
-	return rb_thread_call_without_gvl(nogvl_opendir_at, &oaa, RUBY_UBF_IO, 0);
+        return IO_WITHOUT_GVL(nogvl_opendir_at, &oaa);
     else
-	return nogvl_opendir_at(&oaa);
+        return nogvl_opendir_at(&oaa);
 }
 
 static DIR *
 do_opendir(const int basefd, size_t baselen, const char *path, int flags, rb_encoding *enc,
-	   ruby_glob_errfunc *errfunc, VALUE arg, int *status)
+           ruby_glob_errfunc *errfunc, VALUE arg, int *status)
 {
     DIR *dirp;
 #ifdef _WIN32
     VALUE tmp = 0;
     if (!fundamental_encoding_p(enc)) {
-	tmp = rb_enc_str_new(path, strlen(path), enc);
-	tmp = rb_str_encode_ospath(tmp);
-	path = RSTRING_PTR(tmp);
+        tmp = rb_enc_str_new(path, strlen(path), enc);
+        tmp = rb_str_encode_ospath(tmp);
+        path = RSTRING_PTR(tmp);
     }
 #endif
     dirp = opendir_at(basefd, at_subpath(basefd, baselen, path));
     if (!dirp) {
-	int e = errno;
-
-	*status = 0;
-	if (!to_be_ignored(e)) {
-	    if (errfunc) {
-		*status = (*errfunc)(path, arg, enc, e);
-	    }
-	    else {
-		sys_warning(path, enc);
-	    }
-	}
+        int e = errno;
+
+        *status = 0;
+        if (!to_be_ignored(e)) {
+            if (errfunc) {
+                *status = (*errfunc)(path, arg, enc, e);
+            }
+            else {
+                sys_warning(path, enc);
+            }
+        }
     }
 #ifdef _WIN32
     if (tmp) rb_str_resize(tmp, 0); /* GC guard */
@@ -1550,37 +1984,37 @@ has_magic(const char *p, const char *pend, int flags, rb_encoding *enc)
     register char c;
 
     while (p < pend && (c = *p++) != 0) {
-	switch (c) {
-	  case '{':
-	    return BRACE;
+        switch (c) {
+          case '{':
+            return BRACE;
 
-	  case '*':
-	  case '?':
-	  case '[':
-	    hasmagical = 1;
-	    break;
+          case '*':
+          case '?':
+          case '[':
+            hasmagical = 1;
+            break;
 
-	  case '\\':
-	    if (escape && p++ >= pend)
-		continue;
-	    break;
+          case '\\':
+            if (escape && p++ >= pend)
+                continue;
+            break;
 
 #ifdef _WIN32
-	  case '.':
-	    break;
+          case '.':
+            break;
 
-	  case '~':
-	    hasalpha = 1;
-	    break;
+          case '~':
+            hasalpha = 1;
+            break;
 #endif
-	  default:
-	    if (IS_WIN32 || ISALPHA(c)) {
-		hasalpha = 1;
-	    }
-	    break;
-	}
+          default:
+            if (IS_WIN32 || ISALPHA(c)) {
+                hasalpha = 1;
+            }
+            break;
+        }
 
-	p = Next(p-1, pend, enc);
+        p = Next(p-1, pend, enc);
     }
 
     return hasmagical ? MAGICAL : hasalpha ? ALPHA : PLAIN;
@@ -1596,33 +2030,33 @@ find_dirsep(const char *p, const char *pend, int flags, rb_encoding *enc)
     int open = 0;
 
     while ((c = *p++) != 0) {
-	switch (c) {
-	  case '[':
-	    open = 1;
-	    continue;
-	  case ']':
-	    open = 0;
-	    continue;
-
-	  case '{':
-	    open = 1;
-	    continue;
-	  case '}':
-	    open = 0;
-	    continue;
-
-	  case '/':
-	    if (!open)
-		return (char *)p-1;
-	    continue;
-
-	  case '\\':
-	    if (escape && !(c = *p++))
-		return (char *)p-1;
-	    continue;
-	}
-
-	p = Next(p-1, pend, enc);
+        switch (c) {
+          case '[':
+            open = 1;
+            continue;
+          case ']':
+            open = 0;
+            continue;
+
+          case '{':
+            open = 1;
+            continue;
+          case '}':
+            open = 0;
+            continue;
+
+          case '/':
+            if (!open)
+                return (char *)p-1;
+            continue;
+
+          case '\\':
+            if (escape && !(c = *p++))
+                return (char *)p-1;
+            continue;
+        }
+
+        p = Next(p-1, pend, enc);
     }
 
     return (char *)p-1;
@@ -1636,20 +2070,20 @@ remove_backslashes(char *p, register const char *pend, rb_encoding *enc)
     char *s = p;
 
     while (*p) {
-	if (*p == '\\') {
-	    if (t != s)
-		memmove(t, s, p - s);
-	    t += p - s;
-	    s = ++p;
-	    if (!*p) break;
-	}
-	Inc(p, pend, enc);
+        if (*p == '\\') {
+            if (t != s)
+                memmove(t, s, p - s);
+            t += p - s;
+            s = ++p;
+            if (!*p) break;
+        }
+        Inc(p, pend, enc);
     }
 
     while (*p++);
 
     if (t != s)
-	memmove(t, s, p - s); /* move '\0' too */
+        memmove(t, s, p - s); /* move '\0' too */
 
     return p;
 }
@@ -1670,49 +2104,49 @@ glob_make_pattern(const char *p, const char *e, int flags, rb_encoding *enc)
     int recursive = 0;
 
     while (p < e && *p) {
-	tmp = GLOB_ALLOC(struct glob_pattern);
-	if (!tmp) goto error;
-	if (p + 2 < e && p[0] == '*' && p[1] == '*' && p[2] == '/') {
-	    /* fold continuous RECURSIVEs (needed in glob_helper) */
-	    do { p += 3; while (*p == '/') p++; } while (p[0] == '*' && p[1] == '*' && p[2] == '/');
-	    tmp->type = RECURSIVE;
-	    tmp->str = 0;
-	    dirsep = 1;
-	    recursive = 1;
-	}
-	else {
-	    const char *m = find_dirsep(p, e, flags, enc);
-	    const enum glob_pattern_type magic = has_magic(p, m, flags, enc);
-	    const enum glob_pattern_type non_magic = (USE_NAME_ON_FS || FNM_SYSCASE) ? PLAIN : ALPHA;
-	    char *buf;
-
-	    if (!(FNM_SYSCASE || magic > non_magic) && !recursive && *m) {
-		const char *m2;
-		while (has_magic(m+1, m2 = find_dirsep(m+1, e, flags, enc), flags, enc) <= non_magic &&
-		       *m2) {
-		    m = m2;
-		}
-	    }
-	    buf = GLOB_ALLOC_N(char, m-p+1);
-	    if (!buf) {
-		GLOB_FREE(tmp);
-		goto error;
-	    }
-	    memcpy(buf, p, m-p);
-	    buf[m-p] = '\0';
-	    tmp->type = magic > MAGICAL ? MAGICAL : magic > non_magic ? magic : PLAIN;
-	    tmp->str = buf;
-	    if (*m) {
-		dirsep = 1;
-		p = m + 1;
-	    }
-	    else {
-		dirsep = 0;
-		p = m;
-	    }
-	}
-	*tail = tmp;
-	tail = &tmp->next;
+        tmp = GLOB_ALLOC(struct glob_pattern);
+        if (!tmp) goto error;
+        if (p + 2 < e && p[0] == '*' && p[1] == '*' && p[2] == '/') {
+            /* fold continuous RECURSIVEs (needed in glob_helper) */
+            do { p += 3; while (*p == '/') p++; } while (p[0] == '*' && p[1] == '*' && p[2] == '/');
+            tmp->type = RECURSIVE;
+            tmp->str = 0;
+            dirsep = 1;
+            recursive = 1;
+        }
+        else {
+            const char *m = find_dirsep(p, e, flags, enc);
+            const enum glob_pattern_type magic = has_magic(p, m, flags, enc);
+            const enum glob_pattern_type non_magic = (USE_NAME_ON_FS || FNM_SYSCASE) ? PLAIN : ALPHA;
+            char *buf;
+
+            if (!(FNM_SYSCASE || magic > non_magic) && !recursive && *m) {
+                const char *m2;
+                while (has_magic(m+1, m2 = find_dirsep(m+1, e, flags, enc), flags, enc) <= non_magic &&
+                       *m2) {
+                    m = m2;
+                }
+            }
+            buf = GLOB_ALLOC_N(char, m-p+1);
+            if (!buf) {
+                GLOB_FREE(tmp);
+                goto error;
+            }
+            memcpy(buf, p, m-p);
+            buf[m-p] = '\0';
+            tmp->type = magic > MAGICAL ? MAGICAL : magic > non_magic ? magic : PLAIN;
+            tmp->str = buf;
+            if (*m) {
+                dirsep = 1;
+                p = m + 1;
+            }
+            else {
+                dirsep = 0;
+                p = m;
+            }
+        }
+        *tail = tmp;
+        tail = &tmp->next;
     }
 
     tmp = GLOB_ALLOC(struct glob_pattern);
@@ -1736,11 +2170,11 @@ static void
 glob_free_pattern(struct glob_pattern *list)
 {
     while (list) {
-	struct glob_pattern *tmp = list;
-	list = list->next;
-	if (tmp->str)
-	    GLOB_FREE(tmp->str);
-	GLOB_FREE(tmp);
+        struct glob_pattern *tmp = list;
+        list = list->next;
+        if (tmp->str)
+            GLOB_FREE(tmp->str);
+        GLOB_FREE(tmp);
     }
 }
 
@@ -1752,7 +2186,7 @@ join_path(const char *path, size_t len, int dirsep, const char *name, size_t nam
     if (!buf) return 0;
     memcpy(buf, path, len);
     if (dirsep) {
-	buf[len++] = '/';
+        buf[len++] = '/';
     }
     memcpy(buf+len, name, namlen);
     buf[len+namlen] = '\0';
@@ -1769,23 +2203,24 @@ static int
 is_case_sensitive(DIR *dirp, const char *path)
 {
     struct {
-	u_int32_t length;
-	vol_capabilities_attr_t cap[1];
+        u_int32_t length;
+        vol_capabilities_attr_t cap[1];
     } __attribute__((aligned(4), packed)) attrbuf[1];
     struct attrlist al = {ATTR_BIT_MAP_COUNT, 0, 0, ATTR_VOL_INFO|ATTR_VOL_CAPABILITIES};
     const vol_capabilities_attr_t *const cap = attrbuf[0].cap;
     const int idx = VOL_CAPABILITIES_FORMAT;
     const uint32_t mask = VOL_CAP_FMT_CASE_SENSITIVE;
-
+    struct getattrlist_args args = GETATTRLIST_ARGS(&al, attrbuf, FSOPT_NOFOLLOW);
 #   if defined HAVE_FGETATTRLIST
-    if (fgetattrlist(dirfd(dirp), &al, attrbuf, sizeof(attrbuf), FSOPT_NOFOLLOW))
-	return -1;
+    int ret = gvl_fgetattrlist(&args, dirfd(dirp));
 #   else
-    if (getattrlist(path, &al, attrbuf, sizeof(attrbuf), FSOPT_NOFOLLOW))
-	return -1;
+    int ret = gvl_getattrlist(&args, path);
 #   endif
+    if (ret)
+        return -1;
+
     if (!(cap->valid[idx] & mask))
-	return -1;
+        return -1;
     return (cap->capabilities[idx] & mask) != 0;
 }
 
@@ -1793,10 +2228,10 @@ static char *
 replace_real_basename(char *path, long base, rb_encoding *enc, int norm_p, int flags, rb_pathtype_t *type)
 {
     struct {
-	u_int32_t length;
-	attrreference_t ref[1];
-	fsobj_type_t objtype;
-	char path[MAXPATHLEN * 3];
+        u_int32_t length;
+        attrreference_t ref[1];
+        fsobj_type_t objtype;
+        char path[MAXPATHLEN * 3];
     } __attribute__((aligned(4), packed)) attrbuf[1];
     struct attrlist al = {ATTR_BIT_MAP_COUNT, 0, ATTR_CMN_NAME|ATTR_CMN_OBJTYPE};
     const attrreference_t *const ar = attrbuf[0].ref;
@@ -1806,10 +2241,11 @@ replace_real_basename(char *path, long base, rb_encoding *enc, int norm_p, int f
     IF_NORMALIZE_UTF8PATH(VALUE utf8str = Qnil);
 
     *type = path_noent;
-    if (getattrlist(path, &al, attrbuf, sizeof(attrbuf), FSOPT_NOFOLLOW)) {
-	if (!to_be_ignored(errno))
-	    sys_warning(path, enc);
-	return path;
+    struct getattrlist_args args = GETATTRLIST_ARGS(&al, attrbuf, FSOPT_NOFOLLOW);
+    if (gvl_getattrlist(&args, path)) {
+        if (!to_be_ignored(errno))
+            sys_warning(path, enc);
+        return path;
     }
 
     switch (attrbuf[0].objtype) {
@@ -1821,21 +2257,21 @@ replace_real_basename(char *path, long base, rb_encoding *enc, int norm_p, int f
     name = (char *)ar + ar->attr_dataoffset;
     len = (long)ar->attr_length - 1;
     if (name + len > (char *)attrbuf + sizeof(attrbuf))
-	return path;
+        return path;
 
 # if NORMALIZE_UTF8PATH
     if (norm_p && has_nonascii(name, len)) {
-	if (!NIL_P(utf8str = rb_str_normalize_ospath(name, len))) {
-	    RSTRING_GETMEM(utf8str, name, len);
-	}
+        if (!NIL_P(utf8str = rb_str_normalize_ospath(name, len))) {
+            RSTRING_GETMEM(utf8str, name, len);
+        }
     }
 # endif
 
     tmp = GLOB_REALLOC(path, base + len + 1);
     if (tmp) {
-	path = tmp;
-	memcpy(path + base, name, len);
-	path[base + len] = '\0';
+        path = tmp;
+        memcpy(path + base, name, len);
+        path[base + len] = '\0';
     }
     IF_NORMALIZE_UTF8PATH(if (!NIL_P(utf8str)) rb_str_resize(utf8str, 0));
     return path;
@@ -1856,62 +2292,62 @@ replace_real_basename(char *path, long base, rb_encoding *enc, int norm_p, int f
     long wlen;
     int e = 0;
     if (!fundamental_encoding_p(enc)) {
-	tmp = rb_enc_str_new_cstr(plainname, enc);
-	tmp = rb_str_encode_ospath(tmp);
-	plainname = RSTRING_PTR(tmp);
+        tmp = rb_enc_str_new_cstr(plainname, enc);
+        tmp = rb_str_encode_ospath(tmp);
+        plainname = RSTRING_PTR(tmp);
     }
     wplain = rb_w32_mbstr_to_wstr(CP_UTF8, plainname, -1, &wlen);
     if (tmp) rb_str_resize(tmp, 0);
     if (!wplain) return path;
     if (GetFileAttributesExW(wplain, GetFileExInfoStandard, &fa)) {
-	h = FindFirstFileW(wplain, &fd);
-	e = rb_w32_map_errno(GetLastError());
+        h = FindFirstFileW(wplain, &fd);
+        e = rb_w32_map_errno(GetLastError());
     }
     if (fa.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) {
-	if (!rb_w32_reparse_symlink_p(wplain))
-	    fa.dwFileAttributes &= ~FILE_ATTRIBUTE_REPARSE_POINT;
+        if (!rb_w32_reparse_symlink_p(wplain))
+            fa.dwFileAttributes &= ~FILE_ATTRIBUTE_REPARSE_POINT;
     }
     free(wplain);
     if (h == INVALID_HANDLE_VALUE) {
-	*type = path_noent;
-	if (e && !to_be_ignored(e)) {
-	    errno = e;
-	    sys_warning(path, enc);
-	}
-	return path;
+        *type = path_noent;
+        if (e && !to_be_ignored(e)) {
+            errno = e;
+            sys_warning(path, enc);
+        }
+        return path;
     }
     FindClose(h);
     *type =
-	(fa.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) ? path_symlink :
-	(fa.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) ? path_directory :
-	path_regular;
+        (fa.dwFileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) ? path_symlink :
+        (fa.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) ? path_directory :
+        path_regular;
     if (tmp) {
-	char *buf;
-	tmp = rb_w32_conv_from_wchar(fd.cFileName, enc);
-	wlen = RSTRING_LEN(tmp);
-	buf = GLOB_REALLOC(path, base + wlen + 1);
-	if (buf) {
-	    path = buf;
-	    memcpy(path + base, RSTRING_PTR(tmp), wlen);
-	    path[base + wlen] = 0;
-	}
-	rb_str_resize(tmp, 0);
+        char *buf;
+        tmp = rb_w32_conv_from_wchar(fd.cFileName, enc);
+        wlen = RSTRING_LEN(tmp);
+        buf = GLOB_REALLOC(path, base + wlen + 1);
+        if (buf) {
+            path = buf;
+            memcpy(path + base, RSTRING_PTR(tmp), wlen);
+            path[base + wlen] = 0;
+        }
+        rb_str_resize(tmp, 0);
     }
     else {
-	char *utf8filename;
-	wlen = WideCharToMultiByte(CP_UTF8, 0, fd.cFileName, -1, NULL, 0, NULL, NULL);
-	utf8filename = GLOB_REALLOC(0, wlen);
-	if (utf8filename) {
-	    char *buf;
-	    WideCharToMultiByte(CP_UTF8, 0, fd.cFileName, -1, utf8filename, wlen, NULL, NULL);
-	    buf = GLOB_REALLOC(path, base + wlen + 1);
-	    if (buf) {
-		path = buf;
-		memcpy(path + base, utf8filename, wlen);
-		path[base + wlen] = 0;
-	    }
-	    GLOB_FREE(utf8filename);
-	}
+        char *utf8filename;
+        wlen = WideCharToMultiByte(CP_UTF8, 0, fd.cFileName, -1, NULL, 0, NULL, NULL);
+        utf8filename = GLOB_REALLOC(0, wlen);
+        if (utf8filename) {
+            char *buf;
+            WideCharToMultiByte(CP_UTF8, 0, fd.cFileName, -1, utf8filename, wlen, NULL, NULL);
+            buf = GLOB_REALLOC(path, base + wlen + 1);
+            if (buf) {
+                path = buf;
+                memcpy(path + base, utf8filename, wlen);
+                path[base + wlen] = 0;
+            }
+            GLOB_FREE(utf8filename);
+        }
     }
     return path;
 }
@@ -2003,7 +2439,7 @@ rb_glob_error(const char *path, VALUE a, const void *enc, int error)
 #ifdef ENOTCAPABLE
       case ENOTCAPABLE:
 #endif
-	errfunc = glob_func_warning;
+        errfunc = glob_func_warning;
     }
     args.path = path;
     args.enc = enc;
@@ -2027,7 +2463,7 @@ dirent_match(const char *pat, rb_encoding *enc, const char *name, const rb_diren
     if (fnmatch(pat, enc, name, flags) == 0) return 1;
 #ifdef _WIN32
     if (dp->d_altname && (flags & FNM_SHORTNAME)) {
-	if (fnmatch(pat, enc, dp->d_altname, flags) == 0) return 1;
+        if (fnmatch(pat, enc, dp->d_altname, flags) == 0) return 1;
     }
 #endif
     return 0;
@@ -2068,39 +2504,39 @@ join_path_from_pattern(struct glob_pattern **beg)
     size_t path_len = 0;
 
     for (p = *beg; p; p = p->next) {
-	const char *str;
-	switch (p->type) {
-	  case RECURSIVE:
-	    str = "**";
-	    break;
-	  case MATCH_DIR:
-	    /* append last slash */
-	    str = "";
-	    break;
-	  default:
-	    str = p->str;
-	    if (!str) continue;
-	}
-	if (!path) {
-	    path_len = strlen(str);
-	    path = GLOB_ALLOC_N(char, path_len + 1);
+        const char *str;
+        switch (p->type) {
+          case RECURSIVE:
+            str = "**";
+            break;
+          case MATCH_DIR:
+            /* append last slash */
+            str = "";
+            break;
+          default:
+            str = p->str;
+            if (!str) continue;
+        }
+        if (!path) {
+            path_len = strlen(str);
+            path = GLOB_ALLOC_N(char, path_len + 1);
             if (path) {
                 memcpy(path, str, path_len);
                 path[path_len] = '\0';
             }
         }
         else {
-	    size_t len = strlen(str);
-	    char *tmp;
-	    tmp = GLOB_REALLOC(path, path_len + len + 2);
-	    if (tmp) {
-		path = tmp;
-		path[path_len++] = '/';
-		memcpy(path + path_len, str, len);
-		path_len += len;
-		path[path_len] = '\0';
-	    }
-	}
+            size_t len = strlen(str);
+            char *tmp;
+            tmp = GLOB_REALLOC(path, path_len + len + 2);
+            if (tmp) {
+                path = tmp;
+                path[path_len++] = '/';
+                memcpy(path + path_len, str, len);
+                path_len += len;
+                path[path_len] = '\0';
+            }
+        }
     }
     return path;
 }
@@ -2108,7 +2544,7 @@ join_path_from_pattern(struct glob_pattern **beg)
 static int push_caller(const char *path, VALUE val, void *enc);
 
 static int ruby_brace_expand(const char *str, int flags, ruby_glob_func *func, VALUE arg,
-			     rb_encoding *enc, VALUE var);
+                             rb_encoding *enc, VALUE var);
 
 static const size_t rb_dirent_name_offset =
     offsetof(rb_dirent_t, d_type) + sizeof(uint8_t);
@@ -2179,7 +2615,7 @@ static void
 glob_dir_finish(ruby_glob_entries_t *ent, int flags)
 {
     if (flags & FNM_GLOB_NOSORT) {
-        closedir(ent->nosort.dirp);
+        check_closedir(ent->nosort.dirp);
         ent->nosort.dirp = NULL;
     }
     else if (ent->sort.entries) {
@@ -2210,13 +2646,13 @@ glob_opendir(ruby_glob_entries_t *ent, DIR *dirp, int flags, rb_encoding *enc)
 #ifdef _WIN32
         if ((capacity = dirp->nfiles) > 0) {
             if (!(newp = GLOB_ALLOC_N(rb_dirent_t, capacity))) {
-                closedir(dirp);
+                check_closedir(dirp);
                 return NULL;
             }
             ent->sort.entries = newp;
         }
 #endif
-	while ((dp = READDIR(dirp, enc)) != NULL) {
+        while ((dp = READDIR(dirp, enc)) != NULL) {
             rb_dirent_t *rdp = dirent_copy(dp, NULL);
             if (!rdp) {
                 goto nomem;
@@ -2230,7 +2666,7 @@ glob_opendir(ruby_glob_entries_t *ent, DIR *dirp, int flags, rb_encoding *enc)
             ent->sort.entries[count++] = rdp;
             ent->sort.count = count;
         }
-        closedir(dirp);
+        check_closedir(dirp);
         if (count < capacity) {
             if (!(newp = GLOB_REALLOC_N(ent->sort.entries, count))) {
                 glob_dir_finish(ent, 0);
@@ -2245,7 +2681,7 @@ glob_opendir(ruby_glob_entries_t *ent, DIR *dirp, int flags, rb_encoding *enc)
 
   nomem:
     glob_dir_finish(ent, 0);
-    closedir(dirp);
+    check_closedir(dirp);
     return NULL;
 }
 
@@ -2288,133 +2724,133 @@ glob_helper(
     rb_check_stack_overflow();
 
     for (cur = beg; cur < end; ++cur) {
-	struct glob_pattern *p = *cur;
-	if (p->type == RECURSIVE) {
-	    recursive = 1;
-	    p = p->next;
-	}
-	switch (p->type) {
-	  case PLAIN:
-	    plain = 1;
-	    break;
-	  case ALPHA:
+        struct glob_pattern *p = *cur;
+        if (p->type == RECURSIVE) {
+            recursive = 1;
+            p = p->next;
+        }
+        switch (p->type) {
+          case PLAIN:
+            plain = 1;
+            break;
+          case ALPHA:
 #if USE_NAME_ON_FS == USE_NAME_ON_FS_REAL_BASENAME
-	    plain = 1;
+            plain = 1;
 #else
-	    magical = 1;
-#endif
-	    break;
-	  case BRACE:
-	    if (!recursive) {
-		brace = 1;
-	    }
-	    break;
-	  case MAGICAL:
-	    magical = 2;
-	    break;
-	  case MATCH_ALL:
-	    match_all = 1;
-	    break;
-	  case MATCH_DIR:
-	    match_dir = 1;
-	    break;
-	  case RECURSIVE:
-	    rb_bug("continuous RECURSIVEs");
-	}
+            magical = 1;
+#endif
+            break;
+          case BRACE:
+            if (!recursive || strchr(p->str, '/')) {
+                brace = 1;
+            }
+            break;
+          case MAGICAL:
+            magical = 2;
+            break;
+          case MATCH_ALL:
+            match_all = 1;
+            break;
+          case MATCH_DIR:
+            match_dir = 1;
+            break;
+          case RECURSIVE:
+            rb_bug("continuous RECURSIVEs");
+        }
     }
 
     if (brace) {
-	struct push_glob_args args;
-	char* brace_path = join_path_from_pattern(beg);
-	if (!brace_path) return -1;
-	args.fd = fd;
-	args.path = path;
-	args.baselen = baselen;
-	args.namelen = namelen;
-	args.dirsep = dirsep;
-	args.pathtype = pathtype;
-	args.flags = flags;
-	args.funcs = funcs;
-	args.arg = arg;
-	status = ruby_brace_expand(brace_path, flags, push_caller, (VALUE)&args, enc, Qfalse);
-	GLOB_FREE(brace_path);
-	return status;
+        struct push_glob_args args;
+        char* brace_path = join_path_from_pattern(beg);
+        if (!brace_path) return -1;
+        args.fd = fd;
+        args.path = path;
+        args.baselen = baselen;
+        args.namelen = namelen;
+        args.dirsep = dirsep;
+        args.pathtype = pathtype;
+        args.flags = flags;
+        args.funcs = funcs;
+        args.arg = arg;
+        status = ruby_brace_expand(brace_path, flags, push_caller, (VALUE)&args, enc, Qfalse);
+        GLOB_FREE(brace_path);
+        return status;
     }
 
     if (*path) {
-	if (match_all && pathtype == path_unknown) {
-	    if (do_lstat(fd, baselen, path, &st, flags, enc) == 0) {
-		pathtype = IFTODT(st.st_mode);
-	    }
-	    else {
-		pathtype = path_noent;
-	    }
-	}
-	if (match_dir && (pathtype == path_unknown || pathtype == path_symlink)) {
-	    if (do_stat(fd, baselen, path, &st, flags, enc) == 0) {
-		pathtype = IFTODT(st.st_mode);
-	    }
-	    else {
-		pathtype = path_noent;
-	    }
-	}
-	if (match_all && pathtype > path_noent) {
-	    const char *subpath = path + baselen + (baselen && path[baselen] == '/');
-	    status = glob_call_func(funcs->match, subpath, arg, enc);
-	    if (status) return status;
-	}
-	if (match_dir && pathtype == path_directory) {
-	    int seplen = (baselen && path[baselen] == '/');
-	    const char *subpath = path + baselen + seplen;
-	    char *tmp = join_path(subpath, namelen - seplen, dirsep, "", 0);
-	    if (!tmp) return -1;
-	    status = glob_call_func(funcs->match, tmp, arg, enc);
-	    GLOB_FREE(tmp);
-	    if (status) return status;
-	}
+        if (match_all && pathtype == path_unknown) {
+            if (do_lstat(fd, baselen, path, &st, flags, enc) == 0) {
+                pathtype = IFTODT(st.st_mode);
+            }
+            else {
+                pathtype = path_noent;
+            }
+        }
+        if (match_dir && (pathtype == path_unknown || pathtype == path_symlink)) {
+            if (do_stat(fd, baselen, path, &st, flags, enc) == 0) {
+                pathtype = IFTODT(st.st_mode);
+            }
+            else {
+                pathtype = path_noent;
+            }
+        }
+        if (match_all && pathtype > path_noent) {
+            const char *subpath = path + baselen + (baselen && path[baselen] == '/');
+            status = glob_call_func(funcs->match, subpath, arg, enc);
+            if (status) return status;
+        }
+        if (match_dir && pathtype == path_directory) {
+            int seplen = (baselen && path[baselen] == '/');
+            const char *subpath = path + baselen + seplen;
+            char *tmp = join_path(subpath, namelen - seplen, dirsep, "", 0);
+            if (!tmp) return -1;
+            status = glob_call_func(funcs->match, tmp, arg, enc);
+            GLOB_FREE(tmp);
+            if (status) return status;
+        }
     }
 
     if (pathtype == path_noent) return 0;
 
     if (magical || recursive) {
-	rb_dirent_t *dp;
-	DIR *dirp;
+        rb_dirent_t *dp;
+        DIR *dirp;
 # if USE_NAME_ON_FS == USE_NAME_ON_FS_BY_FNMATCH
-	char *plainname = 0;
+        char *plainname = 0;
 # endif
-	IF_NORMALIZE_UTF8PATH(int norm_p);
+        IF_NORMALIZE_UTF8PATH(int norm_p);
 # if USE_NAME_ON_FS == USE_NAME_ON_FS_BY_FNMATCH
-	if (cur + 1 == end && (*cur)->type <= ALPHA) {
-	    plainname = join_path(path, pathlen, dirsep, (*cur)->str, strlen((*cur)->str));
-	    if (!plainname) return -1;
-	    dirp = do_opendir(fd, basename, plainname, flags, enc, funcs->error, arg, &status);
-	    GLOB_FREE(plainname);
-	}
-	else
+        if (cur + 1 == end && (*cur)->type <= ALPHA) {
+            plainname = join_path(path, pathlen, dirsep, (*cur)->str, strlen((*cur)->str));
+            if (!plainname) return -1;
+            dirp = do_opendir(fd, basename, plainname, flags, enc, funcs->error, arg, &status);
+            GLOB_FREE(plainname);
+        }
+        else
 # else
-	    ;
+            ;
 # endif
-	dirp = do_opendir(fd, baselen, path, flags, enc, funcs->error, arg, &status);
-	if (dirp == NULL) {
+        dirp = do_opendir(fd, baselen, path, flags, enc, funcs->error, arg, &status);
+        if (dirp == NULL) {
 # if FNM_SYSCASE || NORMALIZE_UTF8PATH
-	    if ((magical < 2) && !recursive && (errno == EACCES)) {
-		/* no read permission, fallback */
-		goto literally;
-	    }
+            if ((magical < 2) && !recursive && (errno == EACCES)) {
+                /* no read permission, fallback */
+                goto literally;
+            }
 # endif
-	    return status;
-	}
-	IF_NORMALIZE_UTF8PATH(norm_p = need_normalization(dirp, *path ? path : "."));
+            return status;
+        }
+        IF_NORMALIZE_UTF8PATH(norm_p = need_normalization(dirp, *path ? path : "."));
 
 # if NORMALIZE_UTF8PATH
-	if (!(norm_p || magical || recursive)) {
-	    closedir(dirp);
-	    goto literally;
-	}
+        if (!(norm_p || magical || recursive)) {
+            check_closedir(dirp);
+            goto literally;
+        }
 # endif
 # ifdef HAVE_GETATTRLIST
-	if (is_case_sensitive(dirp, path) == 0)
-	    flags |= FNM_CASEFOLD;
+        if (is_case_sensitive(dirp, path) == 0)
+            flags |= FNM_CASEFOLD;
 # endif
         ruby_glob_entries_t globent;
         if (!glob_opendir(&globent, dirp, flags, enc)) {
@@ -2428,182 +2864,182 @@ glob_helper(
             return status;
         }
 
-	int skipdot = (flags & FNM_GLOB_SKIPDOT);
-	flags |= FNM_GLOB_SKIPDOT;
-
-	while ((dp = glob_getent(&globent, flags, enc)) != NULL) {
-	    char *buf;
-	    rb_pathtype_t new_pathtype = path_unknown;
-	    const char *name;
-	    size_t namlen;
-	    int dotfile = 0;
-	    IF_NORMALIZE_UTF8PATH(VALUE utf8str = Qnil);
-
-	    name = dp->d_name;
-	    namlen = dp->d_namlen;
-	    if (name[0] == '.') {
-		++dotfile;
-		if (namlen == 1) {
-		    /* unless DOTMATCH, skip current directories not to recurse infinitely */
-		    if (recursive && !(flags & FNM_DOTMATCH)) continue;
-		    if (skipdot) continue;
-		    ++dotfile;
-		    new_pathtype = path_directory; /* force to skip stat/lstat */
-		}
-		else if (namlen == 2 && name[1] == '.') {
-		    /* always skip parent directories not to recurse infinitely */
-		    continue;
-		}
-	    }
+        int skipdot = (flags & FNM_GLOB_SKIPDOT);
+        flags |= FNM_GLOB_SKIPDOT;
+
+        while ((dp = glob_getent(&globent, flags, enc)) != NULL) {
+            char *buf;
+            rb_pathtype_t new_pathtype = path_unknown;
+            const char *name;
+            size_t namlen;
+            int dotfile = 0;
+            IF_NORMALIZE_UTF8PATH(VALUE utf8str = Qnil);
+
+            name = dp->d_name;
+            namlen = dp->d_namlen;
+            if (name[0] == '.') {
+                ++dotfile;
+                if (namlen == 1) {
+                    /* unless DOTMATCH, skip current directories not to recurse infinitely */
+                    if (recursive && !(flags & FNM_DOTMATCH)) continue;
+                    if (skipdot) continue;
+                    ++dotfile;
+                    new_pathtype = path_directory; /* force to skip stat/lstat */
+                }
+                else if (namlen == 2 && name[1] == '.') {
+                    /* always skip parent directories not to recurse infinitely */
+                    continue;
+                }
+            }
 
 # if NORMALIZE_UTF8PATH
-	    if (norm_p && has_nonascii(name, namlen)) {
-		if (!NIL_P(utf8str = rb_str_normalize_ospath(name, namlen))) {
-		    RSTRING_GETMEM(utf8str, name, namlen);
-		}
-	    }
+            if (norm_p && has_nonascii(name, namlen)) {
+                if (!NIL_P(utf8str = rb_str_normalize_ospath(name, namlen))) {
+                    RSTRING_GETMEM(utf8str, name, namlen);
+                }
+            }
 # endif
-	    buf = join_path(path, pathlen, dirsep, name, namlen);
-	    IF_NORMALIZE_UTF8PATH(if (!NIL_P(utf8str)) rb_str_resize(utf8str, 0));
-	    if (!buf) {
-		status = -1;
-		break;
-	    }
-	    name = buf + pathlen + (dirsep != 0);
+            buf = join_path(path, pathlen, dirsep, name, namlen);
+            IF_NORMALIZE_UTF8PATH(if (!NIL_P(utf8str)) rb_str_resize(utf8str, 0));
+            if (!buf) {
+                status = -1;
+                break;
+            }
+            name = buf + pathlen + (dirsep != 0);
 #if !EMULATE_IFTODT
-	    if (dp->d_type != DT_UNKNOWN) {
-		/* Got it. We need no more lstat. */
-		new_pathtype = dp->d_type;
-	    }
-#endif
-	    if (recursive && dotfile < ((flags & FNM_DOTMATCH) ? 2 : 1) &&
-		new_pathtype == path_unknown) {
-		/* RECURSIVE never match dot files unless FNM_DOTMATCH is set */
-		if (do_lstat(fd, baselen, buf, &st, flags, enc) == 0)
-		    new_pathtype = IFTODT(st.st_mode);
-		else
-		    new_pathtype = path_noent;
-	    }
-
-	    new_beg = new_end = GLOB_ALLOC_N(struct glob_pattern *, (end - beg) * 2);
-	    if (!new_beg) {
-		GLOB_FREE(buf);
-		status = -1;
-		break;
-	    }
-
-	    for (cur = beg; cur < end; ++cur) {
-		struct glob_pattern *p = *cur;
-		struct dirent_brace_args args;
-		if (p->type == RECURSIVE) {
-		    if (new_pathtype == path_directory || /* not symlink but real directory */
-			new_pathtype == path_exist) {
-			if (dotfile < ((flags & FNM_DOTMATCH) ? 2 : 1))
-			    *new_end++ = p; /* append recursive pattern */
-		    }
-		    p = p->next; /* 0 times recursion */
-		}
-		switch (p->type) {
-		  case BRACE:
-		    args.name = name;
-		    args.dp = dp;
-		    args.flags = flags;
-		    if (ruby_brace_expand(p->str, flags, dirent_match_brace,
-					  (VALUE)&args, enc, Qfalse) > 0)
-			*new_end++ = p->next;
-		    break;
-		  case ALPHA:
+            if (dp->d_type != DT_UNKNOWN) {
+                /* Got it. We need no more lstat. */
+                new_pathtype = dp->d_type;
+            }
+#endif
+            if (recursive && dotfile < ((flags & FNM_DOTMATCH) ? 2 : 1) &&
+                new_pathtype == path_unknown) {
+                /* RECURSIVE never match dot files unless FNM_DOTMATCH is set */
+                if (do_lstat(fd, baselen, buf, &st, flags, enc) == 0)
+                    new_pathtype = IFTODT(st.st_mode);
+                else
+                    new_pathtype = path_noent;
+            }
+
+            new_beg = new_end = GLOB_ALLOC_N(struct glob_pattern *, (end - beg) * 2);
+            if (!new_beg) {
+                GLOB_FREE(buf);
+                status = -1;
+                break;
+            }
+
+            for (cur = beg; cur < end; ++cur) {
+                struct glob_pattern *p = *cur;
+                struct dirent_brace_args args;
+                if (p->type == RECURSIVE) {
+                    if (new_pathtype == path_directory || /* not symlink but real directory */
+                        new_pathtype == path_exist) {
+                        if (dotfile < ((flags & FNM_DOTMATCH) ? 2 : 1))
+                            *new_end++ = p; /* append recursive pattern */
+                    }
+                    p = p->next; /* 0 times recursion */
+                }
+                switch (p->type) {
+                  case BRACE:
+                    args.name = name;
+                    args.dp = dp;
+                    args.flags = flags;
+                    if (ruby_brace_expand(p->str, flags, dirent_match_brace,
+                                          (VALUE)&args, enc, Qfalse) > 0)
+                        *new_end++ = p->next;
+                    break;
+                  case ALPHA:
 # if USE_NAME_ON_FS == USE_NAME_ON_FS_BY_FNMATCH
-		    if (plainname) {
-			*new_end++ = p->next;
-			break;
-		    }
+                    if (plainname) {
+                        *new_end++ = p->next;
+                        break;
+                    }
 # endif
-		  case PLAIN:
-		  case MAGICAL:
-		    if (dirent_match(p->str, enc, name, dp, flags))
-			*new_end++ = p->next;
-		  default:
-		    break;
-		}
-	    }
-
-	    status = glob_helper(fd, buf, baselen, name - buf - baselen + namlen, 1,
-				 new_pathtype, new_beg, new_end,
-				 flags, funcs, arg, enc);
-	    GLOB_FREE(buf);
-	    GLOB_FREE(new_beg);
-	    if (status) break;
-	}
+                  case PLAIN:
+                  case MAGICAL:
+                    if (dirent_match(p->str, enc, name, dp, flags))
+                        *new_end++ = p->next;
+                  default:
+                    break;
+                }
+            }
+
+            status = glob_helper(fd, buf, baselen, name - buf - baselen + namlen, 1,
+                                 new_pathtype, new_beg, new_end,
+                                 flags, funcs, arg, enc);
+            GLOB_FREE(buf);
+            GLOB_FREE(new_beg);
+            if (status) break;
+        }
 
         glob_dir_finish(&globent, flags);
     }
     else if (plain) {
-	struct glob_pattern **copy_beg, **copy_end, **cur2;
+        struct glob_pattern **copy_beg, **copy_end, **cur2;
 
 # if FNM_SYSCASE || NORMALIZE_UTF8PATH
       literally:
 # endif
-	copy_beg = copy_end = GLOB_ALLOC_N(struct glob_pattern *, end - beg);
-	if (!copy_beg) return -1;
-	for (cur = beg; cur < end; ++cur)
-	    *copy_end++ = (*cur)->type <= ALPHA ? *cur : 0;
-
-	for (cur = copy_beg; cur < copy_end; ++cur) {
-	    if (*cur) {
-		rb_pathtype_t new_pathtype = path_unknown;
-		char *buf;
-		char *name;
-		size_t len = strlen((*cur)->str) + 1;
-		name = GLOB_ALLOC_N(char, len);
-		if (!name) {
-		    status = -1;
-		    break;
-		}
-		memcpy(name, (*cur)->str, len);
-		if (escape)
-		    len = remove_backslashes(name, name+len-1, enc) - name;
-
-		new_beg = new_end = GLOB_ALLOC_N(struct glob_pattern *, end - beg);
-		if (!new_beg) {
-		    GLOB_FREE(name);
-		    status = -1;
-		    break;
-		}
-		*new_end++ = (*cur)->next;
-		for (cur2 = cur + 1; cur2 < copy_end; ++cur2) {
-		    if (*cur2 && fnmatch((*cur2)->str, enc, name, flags) == 0) {
-			*new_end++ = (*cur2)->next;
-			*cur2 = 0;
-		    }
-		}
-
-		buf = join_path(path, pathlen, dirsep, name, len);
-		GLOB_FREE(name);
-		if (!buf) {
-		    GLOB_FREE(new_beg);
-		    status = -1;
-		    break;
-		}
+        copy_beg = copy_end = GLOB_ALLOC_N(struct glob_pattern *, end - beg);
+        if (!copy_beg) return -1;
+        for (cur = beg; cur < end; ++cur)
+            *copy_end++ = (*cur)->type <= ALPHA ? *cur : 0;
+
+        for (cur = copy_beg; cur < copy_end; ++cur) {
+            if (*cur) {
+                rb_pathtype_t new_pathtype = path_unknown;
+                char *buf;
+                char *name;
+                size_t len = strlen((*cur)->str) + 1;
+                name = GLOB_ALLOC_N(char, len);
+                if (!name) {
+                    status = -1;
+                    break;
+                }
+                memcpy(name, (*cur)->str, len);
+                if (escape)
+                    len = remove_backslashes(name, name+len-1, enc) - name;
+
+                new_beg = new_end = GLOB_ALLOC_N(struct glob_pattern *, end - beg);
+                if (!new_beg) {
+                    GLOB_FREE(name);
+                    status = -1;
+                    break;
+                }
+                *new_end++ = (*cur)->next;
+                for (cur2 = cur + 1; cur2 < copy_end; ++cur2) {
+                    if (*cur2 && fnmatch((*cur2)->str, enc, name, flags) == 0) {
+                        *new_end++ = (*cur2)->next;
+                        *cur2 = 0;
+                    }
+                }
+
+                buf = join_path(path, pathlen, dirsep, name, len);
+                GLOB_FREE(name);
+                if (!buf) {
+                    GLOB_FREE(new_beg);
+                    status = -1;
+                    break;
+                }
 #if USE_NAME_ON_FS == USE_NAME_ON_FS_REAL_BASENAME
-		if ((*cur)->type == ALPHA) {
-		    buf = replace_real_basename(buf, pathlen + (dirsep != 0), enc,
-						IF_NORMALIZE_UTF8PATH(1)+0,
-						flags, &new_pathtype);
-		    if (!buf) break;
-		}
-#endif
-		status = glob_helper(fd, buf, baselen,
-				     namelen + strlen(buf + pathlen), 1,
-				     new_pathtype, new_beg, new_end,
-				     flags, funcs, arg, enc);
-		GLOB_FREE(buf);
-		GLOB_FREE(new_beg);
-		if (status) break;
-	    }
-	}
-
-	GLOB_FREE(copy_beg);
+                if ((*cur)->type == ALPHA) {
+                    buf = replace_real_basename(buf, pathlen + (dirsep != 0), enc,
+                                                IF_NORMALIZE_UTF8PATH(1)+0,
+                                                flags, &new_pathtype);
+                    if (!buf) break;
+                }
+#endif
+                status = glob_helper(fd, buf, baselen,
+                                     namelen + strlen(buf + pathlen), 1,
+                                     new_pathtype, new_beg, new_end,
+                                     flags, funcs, arg, enc);
+                GLOB_FREE(buf);
+                GLOB_FREE(new_beg);
+                if (status) break;
+            }
+        }
+
+        GLOB_FREE(copy_beg);
     }
 
     return status;
@@ -2618,11 +3054,11 @@ push_caller(const char *path, VALUE val, void *enc)
 
     list = glob_make_pattern(path, path + strlen(path), arg->flags, enc);
     if (!list) {
-	return -1;
+        return -1;
     }
     status = glob_helper(arg->fd, arg->path, arg->baselen, arg->namelen, arg->dirsep,
-			 arg->pathtype, &list, &list + 1, arg->flags, arg->funcs,
-			 arg->arg, enc);
+                         arg->pathtype, &list, &list + 1, arg->flags, arg->funcs,
+                         arg->arg, enc);
     glob_free_pattern(list);
     return status;
 }
@@ -2647,8 +3083,8 @@ push_glob0_caller(const char *path, VALUE val, void *enc)
 
 static int
 ruby_glob0(const char *path, int fd, const char *base, int flags,
-	   const ruby_glob_funcs_t *funcs, VALUE arg,
-	   rb_encoding *enc)
+           const ruby_glob_funcs_t *funcs, VALUE arg,
+           rb_encoding *enc)
 {
     struct glob_pattern *list;
     const char *root, *start;
@@ -2677,10 +3113,10 @@ ruby_glob0(const char *path, int fd, const char *base, int flags,
 
     n = root - start;
     if (!n && base) {
-	n = strlen(base);
-	baselen = n;
-	start = base;
-	dirsep = TRUE;
+        n = strlen(base);
+        baselen = n;
+        start = base;
+        dirsep = TRUE;
     }
     buf = GLOB_ALLOC_N(char, n + 1);
     if (!buf) return -1;
@@ -2689,12 +3125,12 @@ ruby_glob0(const char *path, int fd, const char *base, int flags,
 
     list = glob_make_pattern(root, root + strlen(root), flags, enc);
     if (!list) {
-	GLOB_FREE(buf);
-	return -1;
+        GLOB_FREE(buf);
+        return -1;
     }
     status = glob_helper(fd, buf, baselen, n-baselen, dirsep,
-			 path_unknown, &list, &list + 1,
-			 flags, funcs, arg, enc);
+                         path_unknown, &list, &list + 1,
+                         flags, funcs, arg, enc);
     glob_free_pattern(list);
     GLOB_FREE(buf);
 
@@ -2708,7 +3144,7 @@ ruby_glob(const char *path, int flags, ruby_glob_func *func, VALUE arg)
     funcs.match = func;
     funcs.error = 0;
     return ruby_glob0(path, AT_FDCWD, 0, flags & ~GLOB_VERBOSE,
-		      &funcs, arg, rb_ascii8bit_encoding());
+                      &funcs, arg, rb_ascii8bit_encoding());
 }
 
 static int
@@ -2737,7 +3173,7 @@ rb_glob(const char *path, void (*func)(const char *, VALUE, void *), VALUE arg)
     args.enc = rb_ascii8bit_encoding();
 
     status = ruby_glob0(path, AT_FDCWD, 0, GLOB_VERBOSE, &rb_glob_funcs,
-			(VALUE)&args, args.enc);
+                        (VALUE)&args, args.enc);
     if (status) GLOB_JUMP_TAG(status);
 }
 
@@ -2756,7 +3192,7 @@ push_pattern(const char *path, VALUE ary, void *enc)
 
 static int
 ruby_brace_expand(const char *str, int flags, ruby_glob_func *func, VALUE arg,
-		  rb_encoding *enc, VALUE var)
+                  rb_encoding *enc, VALUE var)
 {
     const int escape = !(flags & FNM_NOESCAPE);
     const char *p = str;
@@ -2766,48 +3202,48 @@ ruby_brace_expand(const char *str, int flags, ruby_glob_func *func, VALUE arg,
     int nest = 0, status = 0;
 
     while (*p) {
-	if (*p == '{' && nest++ == 0) {
-	    lbrace = p;
-	}
-	if (*p == '}' && lbrace && --nest == 0) {
-	    rbrace = p;
-	    break;
-	}
-	if (*p == '\\' && escape) {
-	    if (!*++p) break;
-	}
-	Inc(p, pend, enc);
+        if (*p == '{' && nest++ == 0) {
+            lbrace = p;
+        }
+        if (*p == '}' && lbrace && --nest == 0) {
+            rbrace = p;
+            break;
+        }
+        if (*p == '\\' && escape) {
+            if (!*++p) break;
+        }
+        Inc(p, pend, enc);
     }
 
     if (lbrace && rbrace) {
-	size_t len = strlen(s) + 1;
-	char *buf = GLOB_ALLOC_N(char, len);
-	long shift;
-
-	if (!buf) return -1;
-	memcpy(buf, s, lbrace-s);
-	shift = (lbrace-s);
-	p = lbrace;
-	while (p < rbrace) {
-	    const char *t = ++p;
-	    nest = 0;
-	    while (p < rbrace && !(*p == ',' && nest == 0)) {
-		if (*p == '{') nest++;
-		if (*p == '}') nest--;
-		if (*p == '\\' && escape) {
-		    if (++p == rbrace) break;
-		}
-		Inc(p, pend, enc);
-	    }
-	    memcpy(buf+shift, t, p-t);
-	    strlcpy(buf+shift+(p-t), rbrace+1, len-(shift+(p-t)));
-	    status = ruby_brace_expand(buf, flags, func, arg, enc, var);
-	    if (status) break;
-	}
-	GLOB_FREE(buf);
+        size_t len = strlen(s) + 1;
+        char *buf = GLOB_ALLOC_N(char, len);
+        long shift;
+
+        if (!buf) return -1;
+        memcpy(buf, s, lbrace-s);
+        shift = (lbrace-s);
+        p = lbrace;
+        while (p < rbrace) {
+            const char *t = ++p;
+            nest = 0;
+            while (p < rbrace && !(*p == ',' && nest == 0)) {
+                if (*p == '{') nest++;
+                if (*p == '}') nest--;
+                if (*p == '\\' && escape) {
+                    if (++p == rbrace) break;
+                }
+                Inc(p, pend, enc);
+            }
+            memcpy(buf+shift, t, p-t);
+            strlcpy(buf+shift+(p-t), rbrace+1, len-(shift+(p-t)));
+            status = ruby_brace_expand(buf, flags, func, arg, enc, var);
+            if (status) break;
+        }
+        GLOB_FREE(buf);
     }
     else if (!lbrace && !rbrace) {
-	status = glob_call_func(func, s, arg, enc);
+        status = glob_call_func(func, s, arg, enc);
     }
 
     RB_GC_GUARD(var);
@@ -2858,9 +3294,9 @@ push_glob(VALUE ary, VALUE str, VALUE base, int flags)
     str = rb_str_encode_ospath(str);
 #endif
     if (rb_enc_to_index(enc) == ENCINDEX_US_ASCII)
-	enc = rb_filesystem_encoding();
+        enc = rb_filesystem_encoding();
     if (rb_enc_to_index(enc) == ENCINDEX_US_ASCII)
-	enc = rb_ascii8bit_encoding();
+        enc = rb_ascii8bit_encoding();
     flags |= GLOB_VERBOSE;
     args.func = push_pattern;
     args.value = ary;
@@ -2868,23 +3304,23 @@ push_glob(VALUE ary, VALUE str, VALUE base, int flags)
     args.base = 0;
     fd = AT_FDCWD;
     if (!NIL_P(base)) {
-	if (!RB_TYPE_P(base, T_STRING) || !rb_enc_check(str, base)) {
-	    struct dir_data *dirp = DATA_PTR(base);
-	    if (!dirp->dir) dir_closed();
+        if (!RB_TYPE_P(base, T_STRING) || !rb_enc_check(str, base)) {
+            struct dir_data *dirp = RTYPEDDATA_GET_DATA(base);
+            if (!dirp->dir) dir_closed();
 #ifdef HAVE_DIRFD
-	    if ((fd = dirfd(dirp->dir)) == -1)
-		rb_sys_fail_path(dir_inspect(base));
+            if ((fd = dirfd(dirp->dir)) == -1)
+                rb_sys_fail_path(dir_inspect(base));
 #endif
-	    base = dirp->path;
-	}
-	args.base = RSTRING_PTR(base);
+            base = dirp->path;
+        }
+        args.base = RSTRING_PTR(base);
     }
 #if defined _WIN32 || defined __APPLE__
     enc = rb_utf8_encoding();
 #endif
 
     return ruby_glob0(RSTRING_PTR(str), fd, args.base, flags, &rb_glob_funcs,
-		      (VALUE)&args, enc);
+                      (VALUE)&args, enc);
 }
 
 static VALUE
@@ -2895,13 +3331,13 @@ rb_push_glob(VALUE str, VALUE base, int flags) /* '\0' is delimiter */
 
     /* can contain null bytes as separators */
     if (!RB_TYPE_P(str, T_STRING)) {
-	FilePathValue(str);
+        FilePathValue(str);
     }
     else if (!rb_str_to_cstr(str)) {
         rb_raise(rb_eArgError, "nul-separated glob pattern is deprecated");
     }
     else {
-	rb_enc_check(str, rb_enc_from_encoding(rb_usascii_encoding()));
+        rb_enc_check(str, rb_enc_from_encoding(rb_usascii_encoding()));
     }
     ary = rb_ary_new();
 
@@ -2918,11 +3354,11 @@ dir_globs(VALUE args, VALUE base, int flags)
     long i;
 
     for (i = 0; i < RARRAY_LEN(args); ++i) {
-	int status;
-	VALUE str = RARRAY_AREF(args, i);
-	FilePathValue(str);
-	status = push_glob(ary, str, base, flags);
-	if (status) GLOB_JUMP_TAG(status);
+        int status;
+        VALUE str = RARRAY_AREF(args, i);
+        FilePathValue(str);
+        status = push_glob(ary, str, base, flags);
+        if (status) GLOB_JUMP_TAG(status);
     }
     RB_GC_GUARD(args);
 
@@ -2932,12 +3368,12 @@ dir_globs(VALUE args, VALUE base, int flags)
 static VALUE
 dir_glob_option_base(VALUE base)
 {
-    if (base == Qundef || NIL_P(base)) {
-	return Qnil;
+    if (NIL_OR_UNDEF_P(base)) {
+        return Qnil;
     }
 #if USE_OPENDIR_AT
     if (rb_typeddata_is_kind_of(base, &dir_data_type)) {
-	return base;
+        return base;
     }
 #endif
     FilePathValue(base);
@@ -2948,7 +3384,7 @@ dir_glob_option_base(VALUE base)
 static int
 dir_glob_option_sort(VALUE sort)
 {
-    return (rb_bool_expected(sort, "sort") ? 0 : FNM_GLOB_NOSORT);
+    return (rb_bool_expected(sort, "sort", TRUE) ? 0 : FNM_GLOB_NOSORT);
 }
 
 static VALUE
@@ -2957,7 +3393,7 @@ dir_s_aref(rb_execution_context_t *ec, VALUE obj, VALUE args, VALUE base, VALUE
     const int flags = dir_glob_option_sort(sort);
     base = dir_glob_option_base(base);
     if (RARRAY_LEN(args) == 1) {
-	return rb_push_glob(RARRAY_AREF(args, 0), base, flags);
+        return rb_push_glob(RARRAY_AREF(args, 0), base, flags);
     }
     return dir_globs(args, base, flags);
 }
@@ -2969,15 +3405,15 @@ dir_s_glob(rb_execution_context_t *ec, VALUE obj, VALUE str, VALUE rflags, VALUE
     const int flags = (NUM2INT(rflags) | dir_glob_option_sort(sort)) & ~FNM_CASEFOLD;
     base = dir_glob_option_base(base);
     if (NIL_P(ary)) {
-	ary = rb_push_glob(str, base, flags);
+        ary = rb_push_glob(str, base, flags);
     }
     else {
         ary = dir_globs(ary, base, flags);
     }
 
     if (rb_block_given_p()) {
-	rb_ary_each(ary);
-	return Qnil;
+        rb_ary_each(ary);
+        return Qnil;
     }
     return ary;
 }
@@ -2993,26 +3429,35 @@ dir_open_dir(int argc, VALUE *argv)
 
 
 /*
- *  call-seq:
- *     Dir.foreach( dirname ) {| filename | block }                 -> nil
- *     Dir.foreach( dirname, encoding: enc ) {| filename | block }  -> nil
- *     Dir.foreach( dirname )                                       -> an_enumerator
- *     Dir.foreach( dirname, encoding: enc )                        -> an_enumerator
+ * call-seq:
+ *   Dir.foreach(dirpath, encoding: 'UTF-8') {|entry_name| ... }  -> nil
+ *
+ * Calls the block with each entry name in the directory at +dirpath+;
+ * sets the given encoding onto each passed +entry_name+:
+ *
+ *   Dir.foreach('/example') {|entry_name| p entry_name }
  *
- *  Calls the block once for each entry in the named directory, passing
- *  the filename of each entry as a parameter to the block.
+ * Output:
  *
- *  If no block is given, an enumerator is returned instead.
+ *   "config.h"
+ *   "lib"
+ *   "main.rb"
+ *   ".."
+ *   "."
  *
- *     Dir.foreach("testdir") {|x| puts "Got #{x}" }
+ * Encoding:
  *
- *  <em>produces:</em>
+ *   Dir.foreach('/example') {|entry_name| p entry_name.encoding; break }
+ *   Dir.foreach('/example', encoding: 'US-ASCII') {|entry_name| p entry_name.encoding; break }
  *
- *     Got .
- *     Got ..
- *     Got config.h
- *     Got main.rb
+ * Output:
  *
+ *   #<Encoding:UTF-8>
+ *   #<Encoding:US-ASCII>
+ *
+ * See {String Encoding}[rdoc-ref:encodings.rdoc@String+Encoding].
+ *
+ * Returns an enumerator if no block is given.
  */
 static VALUE
 dir_foreach(int argc, VALUE *argv, VALUE io)
@@ -3034,19 +3479,21 @@ dir_collect(VALUE dir)
 }
 
 /*
- *  call-seq:
- *     Dir.entries( dirname )                -> array
- *     Dir.entries( dirname, encoding: enc ) -> array
+ * call-seq:
+ *   Dir.entries(dirname, encoding: 'UTF-8') -> array
  *
- *  Returns an array containing all of the filenames in the given
- *  directory. Will raise a SystemCallError if the named directory
- *  doesn't exist.
+ * Returns an array of the entry names in the directory at +dirpath+;
+ * sets the given encoding onto each returned entry name:
  *
- *  The optional <i>encoding</i> keyword argument specifies the encoding of the
- *  directory. If not specified, the filesystem encoding is used.
+ *   Dir.entries('/example') # => ["config.h", "lib", "main.rb", "..", "."]
+ *   Dir.entries('/example').first.encoding
+ *   # => #<Encoding:UTF-8>
+ *   Dir.entries('/example', encoding: 'US-ASCII').first.encoding
+ *   # => #<Encoding:US-ASCII>
  *
- *     Dir.entries("testdir")   #=> [".", "..", "config.h", "main.rb"]
+ * See {String Encoding}[rdoc-ref:encodings.rdoc@String+Encoding].
  *
+ * Raises an exception if the directory does not exist.
  */
 static VALUE
 dir_entries(int argc, VALUE *argv, VALUE io)
@@ -3064,25 +3511,12 @@ dir_each_child(VALUE dir)
 }
 
 /*
- *  call-seq:
- *     Dir.each_child( dirname ) {| filename | block }                 -> nil
- *     Dir.each_child( dirname, encoding: enc ) {| filename | block }  -> nil
- *     Dir.each_child( dirname )                                       -> an_enumerator
- *     Dir.each_child( dirname, encoding: enc )                        -> an_enumerator
- *
- *  Calls the block once for each entry except for "." and ".." in the
- *  named directory, passing the filename of each entry as a parameter
- *  to the block.
- *
- *  If no block is given, an enumerator is returned instead.
- *
- *     Dir.each_child("testdir") {|x| puts "Got #{x}" }
- *
- *  <em>produces:</em>
- *
- *     Got config.h
- *     Got main.rb
+ * call-seq:
+ *   Dir.each_child(dirpath) {|entry_name| ... } -> nil
+ *   Dir.each_child(dirpath, encoding: 'UTF-8') {|entry_name| ... }  -> nil
  *
+ * Like Dir.foreach, except that entries <tt>'.'</tt> and <tt>'..'</tt>
+ * are not included.
  */
 static VALUE
 dir_s_each_child(int argc, VALUE *argv, VALUE io)
@@ -3096,24 +3530,22 @@ dir_s_each_child(int argc, VALUE *argv, VALUE io)
 }
 
 /*
- *  call-seq:
- *     dir.each_child {| filename | block }  -> dir
- *     dir.each_child                        -> an_enumerator
- *
- *  Calls the block once for each entry except for "." and ".." in
- *  this directory, passing the filename of each entry as a parameter
- *  to the block.
+ * call-seq:
+ *   each_child {|entry_name| ... } -> self
  *
- *  If no block is given, an enumerator is returned instead.
+ * Calls the block with each entry name in +self+
+ * except <tt>'.'</tt> and <tt>'..'</tt>:
  *
- *     d = Dir.new("testdir")
- *     d.each_child  {|x| puts "Got #{x}" }
+ *   dir = Dir.new('/example')
+ *   dir.each_child {|entry_name| p entry_name }
  *
- *  <em>produces:</em>
+ * Output:
  *
- *     Got config.h
- *     Got main.rb
+ *   "config.h"
+ *   "lib"
+ *   "main.rb"
  *
+ * If no block is given, returns an enumerator.
  */
 static VALUE
 dir_each_child_m(VALUE dir)
@@ -3123,14 +3555,14 @@ dir_each_child_m(VALUE dir)
 }
 
 /*
- *  call-seq:
- *     dir.children  -> array
+ * call-seq:
+ *   children -> array
  *
- *  Returns an array containing all of the filenames except for "."
- *  and ".." in this directory.
+ * Returns an array of the entry names in +self+
+ * except for <tt>'.'</tt> and <tt>'..'</tt>:
  *
- *     d = Dir.new("testdir")
- *     d.children   #=> ["config.h", "main.rb"]
+ *   dir = Dir.new('/example')
+ *   dir.children # => ["config.h", "lib", "main.rb"]
  *
  */
 static VALUE
@@ -3142,19 +3574,23 @@ dir_collect_children(VALUE dir)
 }
 
 /*
- *  call-seq:
- *     Dir.children( dirname )                -> array
- *     Dir.children( dirname, encoding: enc ) -> array
+ * call-seq:
+ *   Dir.children(dirpath) -> array
+ *   Dir.children(dirpath, encoding: 'UTF-8') -> array
  *
- *  Returns an array containing all of the filenames except for "."
- *  and ".." in the given directory. Will raise a SystemCallError if
- *  the named directory doesn't exist.
+ * Returns an array of the entry names in the directory at +dirpath+
+ * except for <tt>'.'</tt> and <tt>'..'</tt>;
+ * sets the given encoding onto each returned entry name:
  *
- *  The optional <i>encoding</i> keyword argument specifies the encoding of the
- *  directory. If not specified, the filesystem encoding is used.
+ *   Dir.children('/example') # => ["config.h", "lib", "main.rb"]
+ *   Dir.children('/example').first.encoding
+ *   # => #<Encoding:UTF-8>
+ *   Dir.children('/example', encoding: 'US-ASCII').first.encoding
+ *   # => #<Encoding:US-ASCII>
  *
- *     Dir.children("testdir")   #=> ["config.h", "main.rb"]
+ * See {String Encoding}[rdoc-ref:encodings.rdoc@String+Encoding].
  *
+ * Raises an exception if the directory does not exist.
  */
 static VALUE
 dir_s_children(int argc, VALUE *argv, VALUE io)
@@ -3174,19 +3610,19 @@ fnmatch_brace(const char *pattern, VALUE val, void *enc)
     rb_encoding *enc_path = rb_enc_get(path);
 
     if (enc_pattern != enc_path) {
-	if (!rb_enc_asciicompat(enc_pattern))
-	    return FNM_NOMATCH;
-	if (!rb_enc_asciicompat(enc_path))
-	    return FNM_NOMATCH;
-	if (!rb_enc_str_asciionly_p(path)) {
-	    int cr = ENC_CODERANGE_7BIT;
-	    long len = strlen(pattern);
-	    if (rb_str_coderange_scan_restartable(pattern, pattern + len,
-						  enc_pattern, &cr) != len)
-		return FNM_NOMATCH;
-	    if (cr != ENC_CODERANGE_7BIT)
-		return FNM_NOMATCH;
-	}
+        if (!rb_enc_asciicompat(enc_pattern))
+            return FNM_NOMATCH;
+        if (!rb_enc_asciicompat(enc_path))
+            return FNM_NOMATCH;
+        if (!rb_enc_str_asciionly_p(path)) {
+            int cr = ENC_CODERANGE_7BIT;
+            long len = strlen(pattern);
+            if (rb_str_coderange_scan_restartable(pattern, pattern + len,
+                                                  enc_pattern, &cr) != len)
+                return FNM_NOMATCH;
+            if (cr != ENC_CODERANGE_7BIT)
+                return FNM_NOMATCH;
+        }
     }
     return (fnmatch(pattern, enc, RSTRING_PTR(path), arg->flags) == 0);
 }
@@ -3200,27 +3636,27 @@ file_s_fnmatch(int argc, VALUE *argv, VALUE obj)
     int flags;
 
     if (rb_scan_args(argc, argv, "21", &pattern, &path, &rflags) == 3)
-	flags = NUM2INT(rflags);
+        flags = NUM2INT(rflags);
     else
-	flags = 0;
+        flags = 0;
 
     StringValueCStr(pattern);
     FilePathStringValue(path);
 
     if (flags & FNM_EXTGLOB) {
-	struct brace_args args;
+        struct brace_args args;
 
-	args.value = path;
-	args.flags = flags;
-	if (ruby_brace_expand(RSTRING_PTR(pattern), flags, fnmatch_brace,
-			      (VALUE)&args, rb_enc_get(pattern), pattern) > 0)
-	    return Qtrue;
+        args.value = path;
+        args.flags = flags;
+        if (ruby_brace_expand(RSTRING_PTR(pattern), flags, fnmatch_brace,
+                              (VALUE)&args, rb_enc_get(pattern), pattern) > 0)
+            return Qtrue;
     }
     else {
-	rb_encoding *enc = rb_enc_compatible(pattern, path);
-	if (!enc) return Qfalse;
-	if (fnmatch(RSTRING_PTR(pattern), enc, RSTRING_PTR(path), flags) == 0)
-	    return Qtrue;
+        rb_encoding *enc = rb_enc_compatible(pattern, path);
+        if (!enc) return Qfalse;
+        if (fnmatch(RSTRING_PTR(pattern), enc, RSTRING_PTR(path), flags) == 0)
+            return Qtrue;
     }
     RB_GC_GUARD(pattern);
 
@@ -3228,12 +3664,16 @@ file_s_fnmatch(int argc, VALUE *argv, VALUE obj)
 }
 
 /*
- *  call-seq:
- *    Dir.home()       -> "/home/me"
- *    Dir.home("root") -> "/root"
+ * call-seq:
+ *   Dir.home(user_name = nil) -> dirpath
+ *
+ * Returns the home directory path of the user specified with +user_name+
+ * if it is not +nil+, or the current login user:
+ *
+ *   Dir.home         # => "/home/me"
+ *   Dir.home('root') # => "/root"
  *
- *  Returns the home directory of the current user or the named user
- *  if given.
+ * Raises ArgumentError if +user_name+ is not a user name.
  */
 static VALUE
 dir_s_home(int argc, VALUE *argv, VALUE obj)
@@ -3244,12 +3684,12 @@ dir_s_home(int argc, VALUE *argv, VALUE obj)
     rb_check_arity(argc, 0, 1);
     user = (argc > 0) ? argv[0] : Qnil;
     if (!NIL_P(user)) {
-	SafeStringValue(user);
-	rb_must_asciicompat(user);
-	u = StringValueCStr(user);
-	if (*u) {
-	    return rb_home_dir_of(user, rb_str_new(0, 0));
-	}
+        StringValue(user);
+        rb_must_asciicompat(user);
+        u = StringValueCStr(user);
+        if (*u) {
+            return rb_home_dir_of(user, rb_str_new(0, 0));
+        }
     }
     return rb_default_home_dir(rb_str_new(0, 0));
 
@@ -3258,10 +3698,15 @@ dir_s_home(int argc, VALUE *argv, VALUE obj)
 #if 0
 /*
  * call-seq:
- *   Dir.exist?(file_name)   ->  true or false
+ *   Dir.exist?(dirpath) ->  true or false
+ *
+ * Returns whether +dirpath+ is a directory in the underlying file system:
+ *
+ *   Dir.exist?('/example')         # => true
+ *   Dir.exist?('/nosuch')          # => false
+ *   Dir.exist?('/example/main.rb') # => false
  *
- * Returns <code>true</code> if the named file is a directory,
- * <code>false</code> otherwise.
+ * Same as File.directory?.
  *
  */
 VALUE
@@ -3279,35 +3724,42 @@ nogvl_dir_empty_p(void *ptr)
     VALUE result = Qtrue;
 
     if (!dir) {
-	int e = errno;
-	switch (gc_for_fd_with_gvl(e)) {
-	  default:
-	    dir = opendir(path);
-	    if (dir) break;
-	    e = errno;
-	    /* fall through */
-	  case 0:
-	    if (e == ENOTDIR) return (void *)Qfalse;
-	    errno = e; /* for rb_sys_fail_path */
-	    return (void *)Qundef;
-	}
-    }
-    while ((dp = READDIR(dir, NULL)) != NULL) {
-	if (!to_be_skipped(dp)) {
-	    result = Qfalse;
-	    break;
-	}
-    }
-    closedir(dir);
+        int e = errno;
+        switch (gc_for_fd_with_gvl(e)) {
+          default:
+            dir = opendir(path);
+            if (dir) break;
+            e = errno;
+            /* fall through */
+          case 0:
+            if (e == ENOTDIR) return (void *)Qfalse;
+            return (void *)INT2FIX(e);
+        }
+    }
+    while ((dp = READDIR_NOGVL(dir, NULL)) != NULL) {
+        if (!to_be_skipped(dp)) {
+            result = Qfalse;
+            break;
+        }
+    }
+    check_closedir(dir);
     return (void *)result;
 }
 
 /*
  * call-seq:
- *   Dir.empty?(path_name)  ->  true or false
+ *   Dir.empty?(dirpath) ->  true or false
+ *
+ * Returns whether +dirpath+ specifies an empty directory:
+ *
+ *   dirpath = '/tmp/foo'
+ *   Dir.mkdir(dirpath)
+ *   Dir.empty?(dirpath)            # => true
+ *   Dir.empty?('/example')         # => false
+ *   Dir.empty?('/example/main.rb') # => false
  *
- * Returns <code>true</code> if the named file is an empty directory,
- * <code>false</code> if it is not a directory or non-empty.
+ * Raises an exception if +dirpath+ does not specify a directory or file
+ * in the underlying file system.
  */
 static VALUE
 rb_dir_s_empty_p(VALUE obj, VALUE dirname)
@@ -3324,27 +3776,27 @@ rb_dir_s_empty_p(VALUE obj, VALUE dirname)
 
 #if defined HAVE_GETATTRLIST && defined ATTR_DIR_ENTRYCOUNT
     {
-	u_int32_t attrbuf[SIZEUP32(fsobj_tag_t)];
-	struct attrlist al = {ATTR_BIT_MAP_COUNT, 0, ATTR_CMN_OBJTAG,};
-	if (getattrlist(path, &al, attrbuf, sizeof(attrbuf), 0) != 0)
-	    rb_sys_fail_path(orig);
-	if (*(const fsobj_tag_t *)(attrbuf+1) == VT_HFS) {
-	    al.commonattr = 0;
-	    al.dirattr = ATTR_DIR_ENTRYCOUNT;
-	    if (getattrlist(path, &al, attrbuf, sizeof(attrbuf), 0) == 0) {
-		if (attrbuf[0] >= 2 * sizeof(u_int32_t))
-		    return RBOOL(attrbuf[1] == 0);
-		if (false_on_notdir) return Qfalse;
-	    }
-	    rb_sys_fail_path(orig);
-	}
-    }
-#endif
-
-    result = (VALUE)rb_thread_call_without_gvl(nogvl_dir_empty_p, (void *)path,
-					    RUBY_UBF_IO, 0);
-    if (result == Qundef) {
-	rb_sys_fail_path(orig);
+        u_int32_t attrbuf[SIZEUP32(fsobj_tag_t)];
+        struct attrlist al = {ATTR_BIT_MAP_COUNT, 0, ATTR_CMN_OBJTAG,};
+        struct getattrlist_args args = GETATTRLIST_ARGS(&al, attrbuf, 0);
+        if (gvl_getattrlist(&args, path) != 0)
+            rb_sys_fail_path(orig);
+        if (*(const fsobj_tag_t *)(attrbuf+1) == VT_HFS) {
+            al.commonattr = 0;
+            al.dirattr = ATTR_DIR_ENTRYCOUNT;
+            if (gvl_getattrlist(&args, path) == 0) {
+                if (attrbuf[0] >= 2 * sizeof(u_int32_t))
+                    return RBOOL(attrbuf[1] == 0);
+                if (false_on_notdir) return Qfalse;
+            }
+            rb_sys_fail_path(orig);
+        }
+    }
+#endif
+
+    result = (VALUE)IO_WITHOUT_GVL(nogvl_dir_empty_p, (void *)path);
+    if (FIXNUM_P(result)) {
+        rb_syserr_fail_path((int)FIX2LONG(result), orig);
     }
     return result;
 }
@@ -3352,11 +3804,15 @@ rb_dir_s_empty_p(VALUE obj, VALUE dirname)
 void
 Init_Dir(void)
 {
+    rb_gc_register_address(&chdir_lock.path);
+    rb_gc_register_address(&chdir_lock.thread);
+
     rb_cDir = rb_define_class("Dir", rb_cObject);
 
     rb_include_module(rb_cDir, rb_mEnumerable);
 
     rb_define_alloc_func(rb_cDir, dir_s_alloc);
+    rb_define_singleton_method(rb_cDir,"for_fd", dir_s_for_fd, 1);
     rb_define_singleton_method(rb_cDir, "foreach", dir_foreach, -1);
     rb_define_singleton_method(rb_cDir, "entries", dir_entries, -1);
     rb_define_singleton_method(rb_cDir, "each_child", dir_s_each_child, -1);
@@ -3376,7 +3832,9 @@ Init_Dir(void)
     rb_define_method(rb_cDir,"pos", dir_tell, 0);
     rb_define_method(rb_cDir,"pos=", dir_set_pos, 1);
     rb_define_method(rb_cDir,"close", dir_close, 0);
+    rb_define_method(rb_cDir,"chdir", dir_chdir, 0);
 
+    rb_define_singleton_method(rb_cDir,"fchdir", dir_s_fchdir, 1);
     rb_define_singleton_method(rb_cDir,"chdir", dir_s_chdir, -1);
     rb_define_singleton_method(rb_cDir,"getwd", dir_s_getwd, 0);
     rb_define_singleton_method(rb_cDir,"pwd", dir_s_getwd, 0);
@@ -3393,51 +3851,19 @@ Init_Dir(void)
     rb_define_singleton_method(rb_cFile,"fnmatch", file_s_fnmatch, -1);
     rb_define_singleton_method(rb_cFile,"fnmatch?", file_s_fnmatch, -1);
 
-    /*  Document-const: File::Constants::FNM_NOESCAPE
-     *
-     *  Disables escapes in File.fnmatch and Dir.glob patterns
-     */
+    /* {File::FNM_NOESCAPE}[rdoc-ref:File::Constants@File-3A-3AFNM_NOESCAPE] */
     rb_file_const("FNM_NOESCAPE", INT2FIX(FNM_NOESCAPE));
-
-    /*  Document-const: File::Constants::FNM_PATHNAME
-     *
-     *  Wildcards in File.fnmatch and Dir.glob patterns do not match directory
-     *  separators
-     */
+    /* {File::FNM_PATHNAME}[rdoc-ref:File::Constants@File-3A-3AFNM_PATHNAME] */
     rb_file_const("FNM_PATHNAME", INT2FIX(FNM_PATHNAME));
-
-    /*  Document-const: File::Constants::FNM_DOTMATCH
-     *
-     *  The '*' wildcard matches filenames starting with "." in File.fnmatch
-     *  and Dir.glob patterns
-     */
+    /* {File::FNM_DOTMATCH}[rdoc-ref:File::Constants@File-3A-3AFNM_DOTMATCH] */
     rb_file_const("FNM_DOTMATCH", INT2FIX(FNM_DOTMATCH));
-
-    /*  Document-const: File::Constants::FNM_CASEFOLD
-     *
-     *  Makes File.fnmatch patterns case insensitive (but not Dir.glob
-     *  patterns).
-     */
+    /* {File::FNM_CASEFOLD}[rdoc-ref:File::Constants@File-3A-3AFNM_CASEFOLD] */
     rb_file_const("FNM_CASEFOLD", INT2FIX(FNM_CASEFOLD));
-
-    /*  Document-const: File::Constants::FNM_EXTGLOB
-     *
-     *  Allows file globbing through "{a,b}" in File.fnmatch patterns.
-     */
+    /* {File::FNM_EXTGLOB}[rdoc-ref:File::Constants@File-3A-3AFNM_EXTGLOB] */
     rb_file_const("FNM_EXTGLOB", INT2FIX(FNM_EXTGLOB));
-
-    /*  Document-const: File::Constants::FNM_SYSCASE
-     *
-     *  System default case insensitiveness, equals to FNM_CASEFOLD or
-     *  0.
-     */
+    /* {File::FNM_SYSCASE}[rdoc-ref:File::Constants@File-3A-3AFNM_SYSCASE] */
     rb_file_const("FNM_SYSCASE", INT2FIX(FNM_SYSCASE));
-
-    /*  Document-const: File::Constants::FNM_SHORTNAME
-     *
-     *  Makes patterns to match short names if existing.  Valid only
-     *  on Microsoft Windows.
-     */
+    /* {File::FNM_SHORTNAME}[rdoc-ref:File::Constants@File-3A-3AFNM_SHORTNAME] */
     rb_file_const("FNM_SHORTNAME", INT2FIX(FNM_SHORTNAME));
 }
 
diff --git a/dir.rb b/dir.rb
index d2ed92c287..eb1a408ee3 100644
--- a/dir.rb
+++ b/dir.rb
@@ -1,15 +1,89 @@
-# Objects of class Dir are directory streams representing
-# directories in the underlying file system. They provide a variety
-# of ways to list directories and their contents. See also File.
+# An object of class \Dir represents a directory in the underlying file system.
 #
-# The directory used in these examples contains the two regular files
-# (<code>config.h</code> and <code>main.rb</code>), the parent
-# directory (<code>..</code>), and the directory itself
-# (<code>.</code>).
+# It consists mainly of:
+#
+# - A string _path_, given when the object is created,
+#   that specifies a directory in the underlying file system;
+#   method #path returns the path.
+# - A collection of string <i>entry names</i>,
+#   each of which is the name of a directory or file in the underlying file system;
+#   the entry names may be retrieved
+#   in an {array-like fashion}[rdoc-ref:Dir@Dir+As+Array-Like]
+#   or in a {stream-like fashion}[rdoc-ref:Dir@Dir+As+Stream-Like].
+#
+# == About the Examples
+#
+# Some examples on this page use this simple file tree:
+#
+#   example/
+#   ├── config.h
+#   ├── lib/
+#   │   ├── song/
+#   │   │   └── karaoke.rb
+#   │   └── song.rb
+#   └── main.rb
+#
+# Others use the file tree for the
+# {Ruby project itself}[https://github.com/ruby/ruby].
+#
+# == \Dir As \Array-Like
+#
+# A \Dir object is in some ways array-like:
+#
+# - It has instance methods #children, #each, and #each_child.
+# - It includes {module Enumerable}[rdoc-ref:Enumerable@What-27s+Here].
+#
+# == \Dir As Stream-Like
+#
+# A \Dir object is in some ways stream-like.
+#
+# The stream is initially open for reading,
+# but may be closed manually (using method #close),
+# and will be closed on block exit if created by Dir.open called with a block.
+# The closed stream may not be further manipulated,
+# and may not be reopened.
+#
+# The stream has a _position_, which is the index of an entry in the directory:
+#
+# - The initial position is zero (before the first entry).
+# - Method #tell (aliased as #pos) returns the position.
+# - Method #pos= sets the position (but ignores a value outside the stream),
+#   and returns the position.
+# - Method #seek is like #pos=, but returns +self+ (convenient for chaining).
+# - Method #read, if not at end-of-stream, reads the next entry and increments
+#   the position;
+#   if at end-of-stream, does not increment the position.
+# - Method #rewind sets the position to zero.
+#
+# Examples (using the {simple file tree}[rdoc-ref:Dir@About+the+Examples]):
+#
+#   dir = Dir.new('example') # => #<Dir:example>
+#   dir.pos                  # => 0
+#
+#   dir.read # => "."
+#   dir.read # => ".."
+#   dir.read # => "config.h"
+#   dir.read # => "lib"
+#   dir.read # => "main.rb"
+#   dir.pos  # => 5
+#   dir.read # => nil
+#   dir.pos  # => 5
+#
+#   dir.rewind # => #<Dir:example>
+#   dir.pos    # => 0
+#
+#   dir.pos = 3 # => 3
+#   dir.pos     # => 3
+#
+#   dir.seek(4) # => #<Dir:example>
+#   dir.pos     # => 4
+#
+#   dir.close # => nil
+#   dir.read  # Raises IOError.
 #
 # == What's Here
 #
-# First, what's elsewhere. \Class \Dir:
+# First, what's elsewhere. Class \Dir:
 #
 # - Inherits from {class Object}[rdoc-ref:Object@What-27s+Here].
 # - Includes {module Enumerable}[rdoc-ref:Enumerable@What-27s+Here],
@@ -65,7 +139,7 @@
 #
 # - ::each_child: Calls the given block with each entry in the given directory,
 #   but not including <tt>.</tt> or <tt>..</tt>.
-# - ::foreach: Calls the given block with each entryin the given directory,
+# - ::foreach: Calls the given block with each entry in the given directory,
 #   including <tt>.</tt> and <tt>..</tt>.
 # - #each: Calls the given block with each entry in +self+,
 #   including <tt>.</tt> and <tt>..</tt>.
@@ -80,20 +154,32 @@
 #   closing it upon block exit.
 # - ::unlink (aliased as ::delete and ::rmdir): Removes the given directory.
 # - #inspect: Returns a string description of +self+.
+#
 class Dir
   # call-seq:
-  #    Dir.open( string ) -> aDir
-  #    Dir.open( string, encoding: enc ) -> aDir
-  #    Dir.open( string ) {| aDir | block } -> anObject
-  #    Dir.open( string, encoding: enc ) {| aDir | block } -> anObject
-  #
-  # The optional <i>encoding</i> keyword argument specifies the encoding of the directory.
-  # If not specified, the filesystem encoding is used.
-  #
-  # With no block, <code>open</code> is a synonym for Dir::new. If a
-  # block is present, it is passed <i>aDir</i> as a parameter. The
-  # directory is closed at the end of the block, and Dir::open returns
-  # the value of the block.
+  #   Dir.open(dirpath) -> dir
+  #   Dir.open(dirpath, encoding: nil) -> dir
+  #   Dir.open(dirpath) {|dir| ... } -> object
+  #   Dir.open(dirpath, encoding: nil) {|dir| ... } -> object
+  #
+  # Creates a new \Dir object _dir_ for the directory at +dirpath+.
+  #
+  # With no block, the method equivalent to Dir.new(dirpath, encoding):
+  #
+  #   Dir.open('.') # => #<Dir:.>
+  #
+  # With a block given, the block is called with the created _dir_;
+  # on block exit _dir_ is closed and the block's value is returned:
+  #
+  #   Dir.open('.') {|dir| dir.inspect } # => "#<Dir:.>"
+  #
+  # The value given with optional keyword argument +encoding+
+  # specifies the encoding for the directory entry names;
+  # if +nil+ (the default), the file system's encoding is used:
+  #
+  #   Dir.open('.').read.encoding                       # => #<Encoding:UTF-8>
+  #   Dir.open('.', encoding: Encoding::US_ASCII).read.encoding # => #<Encoding:US-ASCII>
+  #
   def self.open(name, encoding: nil, &block)
     dir = Primitive.dir_s_open(name, encoding)
     if block
@@ -108,115 +194,221 @@ class Dir
   end
 
   # call-seq:
-  #    Dir.new( string ) -> aDir
-  #    Dir.new( string, encoding: enc ) -> aDir
+  #   Dir.new(dirpath) -> dir
+  #   Dir.new(dirpath, encoding: nil) -> dir
+  #
+  # Returns a new \Dir object for the directory at +dirpath+:
+  #
+  #   Dir.new('.') # => #<Dir:.>
   #
-  # Returns a new directory object for the named directory.
+  # The value given with optional keyword argument +encoding+
+  # specifies the encoding for the directory entry names;
+  # if +nil+ (the default), the file system's encoding is used:
+  #
+  #   Dir.new('.').read.encoding                       # => #<Encoding:UTF-8>
+  #   Dir.new('.', encoding: Encoding::US_ASCI).read.encoding # => #<Encoding:US-ASCII>
   #
-  # The optional <i>encoding</i> keyword argument specifies the encoding of the directory.
-  # If not specified, the filesystem encoding is used.
   def initialize(name, encoding: nil)
     Primitive.dir_initialize(name, encoding)
   end
 
   # call-seq:
-  #    Dir[ string [, string ...] [, base: path] [, sort: true] ] -> array
+  #   Dir[*patterns, base: nil, sort: true] -> array
+  #
+  # Calls Dir.glob with argument +patterns+
+  # and the values of keyword arguments +base+ and +sort+;
+  # returns the array of selected entry names.
   #
-  # Equivalent to calling
-  # <code>Dir.glob([</code><i>string,...</i><code>], 0)</code>.
   def self.[](*args, base: nil, sort: true)
     Primitive.dir_s_aref(args, base, sort)
   end
 
   # call-seq:
-  #    Dir.glob( pattern, [flags], [base: path] [, sort: true] )                       -> array
-  #    Dir.glob( pattern, [flags], [base: path] [, sort: true] ) { |filename| block }  -> nil
+  #   Dir.glob(patterns, flags: 0, base: nil, sort: true) -> array
+  #   Dir.glob(patterns, flags: 0, base: nil, sort: true) {|entry_name| ... } -> nil
   #
-  # Expands +pattern+, which is a pattern string or an Array of pattern
-  # strings, and returns an array containing the matching filenames.
-  # If a block is given, calls the block once for each matching filename,
-  # passing the filename as a parameter to the block.
+  # Forms an array _entry_names_ of the entry names selected by the arguments.
   #
-  # The optional +base+ keyword argument specifies the base directory for
-  # interpreting relative pathnames instead of the current working directory.
-  # As the results are not prefixed with the base directory name in this
-  # case, you will need to prepend the base directory name if you want real
-  # paths.
+  # Argument +patterns+ is a string pattern or an array of string patterns;
+  # note that these are not regexps; see below.
   #
-  # The results which matched single wildcard or character set are sorted in
-  # binary ascending order, unless +false+ is given as the optional +sort+
-  # keyword argument.  The order of an Array of pattern strings and braces
-  # are preserved.
+  # Notes for the following examples:
   #
-  # Note that the pattern is not a regexp, it's closer to a shell glob.
-  # See File::fnmatch for the meaning of the +flags+ parameter.
-  # Case sensitivity depends on your system (+File::FNM_CASEFOLD+ is ignored).
+  # - <tt>'*'</tt> is the pattern that matches any entry name
+  #   except those that begin with <tt>'.'</tt>.
+  # - We use method Array#take to shorten returned arrays
+  #   that otherwise would be very large.
   #
-  # <code>*</code>::
-  #   Matches any file. Can be restricted by other values in the glob.
-  #   Equivalent to <code>/.*/mx</code> in regexp.
+  # With no block, returns array _entry_names_;
+  # example (using the {simple file tree}[rdoc-ref:Dir@About+the+Examples]):
   #
-  #   <code>*</code>::     Matches all files
-  #   <code>c*</code>::    Matches all files beginning with <code>c</code>
-  #   <code>*c</code>::    Matches all files ending with <code>c</code>
-  #   <code>\*c\*</code>:: Match all files that have <code>c</code> in them
-  #                        (including at the beginning or end).
+  #   Dir.glob('*') # => ["config.h", "lib", "main.rb"]
   #
-  #   Note, this will not match Unix-like hidden files (dotfiles).  In order
-  #   to include those in the match results, you must use the
-  #   File::FNM_DOTMATCH flag or something like <code>"{*,.*}"</code>.
+  # With a block, calls the block with each of the _entry_names_
+  # and returns +nil+:
   #
-  # <code>**</code>::
-  #   Matches directories recursively if followed by <code>/</code>.  If
-  #   this path segment contains any other characters, it is the same as the
-  #   usual <code>*</code>.
+  #   Dir.glob('*') {|entry_name| puts entry_name } # => nil
   #
-  # <code>?</code>::
-  #   Matches any one character. Equivalent to <code>/.{1}/</code> in regexp.
+  # Output:
   #
-  # <code>[set]</code>::
-  #   Matches any one character in +set+.  Behaves exactly like character sets
-  #   in Regexp, including set negation (<code>[^a-z]</code>).
+  #   config.h
+  #   lib
+  #   main.rb
   #
-  # <code>{p,q}</code>::
-  #   Matches either literal <code>p</code> or literal <code>q</code>.
-  #   Equivalent to pattern alternation in regexp.
+  # If optional keyword argument +flags+ is given,
+  # the value modifies the matching; see below.
   #
-  #   Matching literals may be more than one character in length.  More than
-  #   two literals may be specified.
+  # If optional keyword argument +base+ is given,
+  # its value specifies the base directory.
+  # Each pattern string specifies entries relative to the base directory;
+  # the default is <tt>'.'</tt>.
+  # The base directory is not prepended to the entry names in the result:
   #
-  # <code>\\</code>::
-  #   Escapes the next metacharacter.
+  #   Dir.glob(pattern, base: 'lib').take(5)
+  #   # => ["abbrev.gemspec", "abbrev.rb", "base64.gemspec", "base64.rb", "benchmark.gemspec"]
+  #   Dir.glob(pattern, base: 'lib/irb').take(5)
+  #   # => ["cmd", "color.rb", "color_printer.rb", "completion.rb", "context.rb"]
   #
-  #   Note that this means you cannot use backslash on windows as part of a
-  #   glob, i.e.  <code>Dir["c:\\foo*"]</code> will not work, use
-  #   <code>Dir["c:/foo*"]</code> instead.
+  # If optional keyword +sort+ is given, its value specifies whether
+  # the array is to be sorted; the default is +true+.
+  # Passing value +false+ with that keyword disables sorting
+  # (though the underlying file system may already have sorted the array).
   #
-  # Examples:
+  # <b>Patterns</b>
+  #
+  # Each pattern string is expanded
+  # according to certain metacharacters;
+  # examples below use the {Ruby file tree}[rdoc-ref:Dir@About+the+Examples]:
+  #
+  # - <tt>'*'</tt>: Matches any substring in an entry name,
+  #   similar in meaning to regexp <tt>/.*/mx</tt>;
+  #   may be restricted by other values in the pattern strings:
+  #
+  #   - <tt>'*'</tt> matches all entry names:
+  #
+  #       Dir.glob('*').take(3)  # => ["BSDL", "CONTRIBUTING.md", "COPYING"]
+  #
+  #   - <tt>'c*'</tt> matches entry names beginning with <tt>'c'</tt>:
+  #
+  #       Dir.glob('c*').take(3) # => ["CONTRIBUTING.md", "COPYING", "COPYING.ja"]
+  #
+  #   - <tt>'*c'</tt> matches entry names ending with <tt>'c'</tt>:
+  #
+  #       Dir.glob('*c').take(3) # => ["addr2line.c", "array.c", "ast.c"]
+  #
+  #   - <tt>'\*c\*'</tt> matches entry names that contain <tt>'c'</tt>,
+  #     even at the beginning or end:
+  #
+  #       Dir.glob('*c*').take(3) # => ["CONTRIBUTING.md", "COPYING", "COPYING.ja"]
+  #
+  #   Does not match Unix-like hidden entry names ("dot files").
+  #   To include those in the matched entry names,
+  #   use flag IO::FNM_DOTMATCH or something like <tt>'{*,.*}'</tt>.
+  #
+  #  - <tt>'**'</tt>: Matches entry names recursively
+  #    if followed by  the slash character <tt>'/'</tt>:
+  #
+  #      Dir.glob('**/').take(3) # => ["basictest/", "benchmark/", "benchmark/gc/"]
+  #
+  #    If the string pattern contains other characters
+  #    or is not followed by a slash character,
+  #    it is equivalent to <tt>'*'</tt>.
+  #
+  # - <tt>'?'</tt> Matches any single character;
+  #   similar in meaning to regexp <tt>/./</tt>:
+  #
+  #     Dir.glob('io.?') # => ["io.c"]
+  #
+  # - <tt>'[set]'</tt>: Matches any one character in the string _set_;
+  #   behaves like a {Regexp character class}[rdoc-ref:Regexp@Character+Classes],
+  #   including set negation (<tt>'[^a-z]'</tt>):
+  #
+  #     Dir.glob('*.[a-z][a-z]').take(3)
+  #     # => ["CONTRIBUTING.md", "COPYING.ja", "KNOWNBUGS.rb"]
+  #
+  # - <tt>'{abc,xyz}'</tt>:
+  #   Matches either string _abc_ or string _xyz_;
+  #   behaves like {Regexp alternation}[rdoc-ref:Regexp@Alternation]:
+  #
+  #     Dir.glob('{LEGAL,BSDL}') # => ["LEGAL", "BSDL"]
+  #
+  #   More than two alternatives may be given.
+  #
+  # - <tt>\\</tt>: Escapes the following metacharacter.
+  #
+  #   Note that on Windows, the backslash character may not be used
+  #   in a string pattern:
+  #   <tt>Dir['c:\\foo*']</tt> will not work, use <tt>Dir['c:/foo*']</tt> instead.
+  #
+  # More examples (using the {simple file tree}[rdoc-ref:Dir@About+the+Examples]):
+  #
+  #   # We're in the example directory.
+  #   File.basename(Dir.pwd) # => "example"
+  #   Dir.glob('config.?')              # => ["config.h"]
+  #   Dir.glob('*.[a-z][a-z]')          # => ["main.rb"]
+  #   Dir.glob('*.[^r]*')               # => ["config.h"]
+  #   Dir.glob('*.{rb,h}')              # => ["main.rb", "config.h"]
+  #   Dir.glob('*')                     # => ["config.h", "lib", "main.rb"]
+  #   Dir.glob('*', File::FNM_DOTMATCH) # => [".", "config.h", "lib", "main.rb"]
+  #   Dir.glob(["*.rb", "*.h"])         # => ["main.rb", "config.h"]
+  #
+  #   Dir.glob('**/*.rb')
+  #   => ["lib/song/karaoke.rb", "lib/song.rb", "main.rb"]
+  #
+  #   Dir.glob('**/*.rb', base: 'lib')  #   => ["song/karaoke.rb", "song.rb"]
+  #
+  #   Dir.glob('**/lib')                # => ["lib"]
+  #
+  #   Dir.glob('**/lib/**/*.rb')        # => ["lib/song/karaoke.rb", "lib/song.rb"]
+  #
+  #   Dir.glob('**/lib/*.rb')           # => ["lib/song.rb"]
+  #
+  # <b>Flags</b>
+  #
+  # If optional keyword argument +flags+ is given (the default is zero -- no flags),
+  # its value should be the bitwise OR of one or more of the constants
+  # defined in module File::Constants.
+  #
+  # Example:
+  #
+  #   flags = File::FNM_EXTGLOB | File::FNM_DOTMATCH
+  #
+  # Specifying flags can extend, restrict, or otherwise modify the matching.
+  #
+  # The flags for this method (other constants in File::Constants do not apply):
+  #
+  # - File::FNM_DOTMATCH:
+  #   specifies that entry names beginning with <tt>'.'</tt>
+  #   should be considered for matching:
+  #
+  #     Dir.glob('*').take(5)
+  #     # => ["BSDL", "CONTRIBUTING.md", "COPYING", "COPYING.ja", "GPL"]
+  #     Dir.glob('*', flags: File::FNM_DOTMATCH).take(5)
+  #     # => [".", ".appveyor.yml", ".cirrus.yml", ".dir-locals.el", ".document"]
   #
-  #    Dir["config.?"]                     #=> ["config.h"]
-  #    Dir.glob("config.?")                #=> ["config.h"]
-  #    Dir.glob("*.[a-z][a-z]")            #=> ["main.rb"]
-  #    Dir.glob("*.[^r]*")                 #=> ["config.h"]
-  #    Dir.glob("*.{rb,h}")                #=> ["main.rb", "config.h"]
-  #    Dir.glob("*")                       #=> ["config.h", "main.rb"]
-  #    Dir.glob("*", File::FNM_DOTMATCH)   #=> [".", "config.h", "main.rb"]
-  #    Dir.glob(["*.rb", "*.h"])           #=> ["main.rb", "config.h"]
+  # - File::FNM_EXTGLOB:
+  #   enables the pattern extension
+  #   <tt>'{a,b}'</tt>, which matches pattern _a_ and pattern _b_;
+  #   behaves like a
+  #   {regexp union}[rdoc-ref:Regexp.union]
+  #   (e.g., <tt>'(?:a|b)'</tt>):
   #
-  #    Dir.glob("**/*.rb")                 #=> ["main.rb",
-  #                                        #    "lib/song.rb",
-  #                                        #    "lib/song/karaoke.rb"]
+  #     pattern = '{LEGAL,BSDL}'
+  #     Dir.glob(pattern)      # => ["LEGAL", "BSDL"]
   #
-  #    Dir.glob("**/*.rb", base: "lib")    #=> ["song.rb",
-  #                                        #    "song/karaoke.rb"]
+  # - File::FNM_NOESCAPE:
+  #   specifies that escaping with the backslash character <tt>'\'</tt>
+  #   is disabled; the character is not an escape character.
   #
-  #    Dir.glob("**/lib")                  #=> ["lib"]
+  # - File::FNM_PATHNAME:
+  #   specifies that metacharacters <tt>'*'</tt> and <tt>'?'</tt>
+  #   do not match directory separators.
   #
-  #    Dir.glob("**/lib/**/*.rb")          #=> ["lib/song.rb",
-  #                                        #    "lib/song/karaoke.rb"]
+  # - File::FNM_SHORTNAME:
+  #   specifies that patterns may match short names if they exist; Windows only.
   #
-  #    Dir.glob("**/lib/*.rb")             #=> ["lib/song.rb"]
   def self.glob(pattern, _flags = 0, flags: _flags, base: nil, sort: true)
+    Primitive.attr! :use_block
     Primitive.dir_s_glob(pattern, flags, base, sort)
   end
 end
diff --git a/dln.c b/dln.c
index 6fa68289dd..2549f03183 100644
--- a/dln.c
+++ b/dln.c
@@ -25,6 +25,7 @@ static void dln_loaderror(const char *format, ...);
 #endif
 #include "dln.h"
 #include "internal.h"
+#include "internal/box.h"
 #include "internal/compilers.h"
 
 #ifdef HAVE_STDLIB_H
@@ -41,6 +42,10 @@ static void dln_loaderror(const char *format, ...);
 # include <strings.h>
 #endif
 
+#if defined __APPLE__
+# include <AvailabilityMacros.h>
+#endif
+
 #ifndef xmalloc
 void *xmalloc();
 void *xcalloc();
@@ -58,7 +63,7 @@ void *xrealloc();
 #include <sys/stat.h>
 
 #ifndef S_ISDIR
-#   define S_ISDIR(m) (((m) & S_IFMT) == S_IFDIR)
+# define S_ISDIR(m) (((m) & S_IFMT) == S_IFDIR)
 #endif
 
 #ifdef HAVE_SYS_PARAM_H
@@ -103,36 +108,45 @@ dln_loaderror(const char *format, ...)
 #endif
 
 #if defined(_WIN32) || defined(USE_DLN_DLOPEN)
-static size_t
-init_funcname_len(const char **file)
+struct string_part {
+    const char *ptr;
+    size_t len;
+};
+
+static struct string_part
+init_funcname_len(const char *file)
 {
-    const char *p = *file, *base, *dot = NULL;
+    const char *p = file, *base, *dot = NULL;
 
     /* Load the file as an object one */
     for (base = p; *p; p++) { /* Find position of last '/' */
-	if (*p == '.' && !dot) dot = p;
-	if (isdirsep(*p)) base = p+1, dot = NULL;
+        if (*p == '.' && !dot) dot = p;
+        if (isdirsep(*p)) base = p+1, dot = NULL;
     }
-    *file = base;
     /* Delete suffix if it exists */
-    return (dot ? dot : p) - base;
+    const size_t len = (dot ? dot : p) - base;
+    return (struct string_part){base, len};
+}
+
+static inline char *
+concat_funcname(char *buf, const char *prefix, size_t plen, const struct string_part base)
+{
+    if (!buf) {
+        dln_memerror();
+    }
+    memcpy(buf, prefix, plen);
+    memcpy(buf + plen, base.ptr, base.len);
+    buf[plen + base.len] = '\0';
+    return buf;
 }
 
-static const char funcname_prefix[sizeof(FUNCNAME_PREFIX) - 1] = FUNCNAME_PREFIX;
-
-#define init_funcname(buf, file) do {\
-    const char *base = (file);\
-    const size_t flen = init_funcname_len(&base);\
-    const size_t plen = sizeof(funcname_prefix);\
-    char *const tmp = ALLOCA_N(char, plen+flen+1);\
-    if (!tmp) {\
-	dln_memerror();\
-    }\
-    memcpy(tmp, funcname_prefix, plen);\
-    memcpy(tmp+plen, base, flen);\
-    tmp[plen+flen] = '\0';\
-    *(buf) = tmp;\
+#define build_funcname(prefix, buf, file) do {\
+    const struct string_part f = init_funcname_len(file);\
+    const size_t plen = sizeof(prefix "") - 1;\
+    *(buf) = concat_funcname(ALLOCA_N(char, plen+f.len+1), prefix, plen, f);\
 } while (0)
+
+#define init_funcname(buf, file) build_funcname(FUNCNAME_PREFIX, buf, file)
 #endif
 
 #ifdef USE_DLN_DLOPEN
@@ -170,14 +184,14 @@ dln_strerror(char *message, size_t size)
     size_t len = snprintf(message, size, "%d: ", error);
 
 #define format_message(sublang) FormatMessage(\
-	FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS,	\
-	NULL, error, MAKELANGID(LANG_NEUTRAL, (sublang)),		\
-	message + len, size - len, NULL)
+        FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS,	\
+        NULL, error, MAKELANGID(LANG_NEUTRAL, (sublang)),		\
+        message + len, size - len, NULL)
     if (format_message(SUBLANG_ENGLISH_US) == 0)
-	format_message(SUBLANG_DEFAULT);
+        format_message(SUBLANG_DEFAULT);
     for (p = message + len; *p; p++) {
-	if (*p == '\n' || *p == '\r')
-	    *p = ' ';
+        if (*p == '\n' || *p == '\r')
+            *p = ' ';
     }
     return message;
 }
@@ -200,18 +214,18 @@ aix_loaderror(const char *pathname)
     snprintf(errbuf, sizeof(errbuf), "load failed - %s. ", pathname);
 
     if (loadquery(L_GETMESSAGES, &message[0], sizeof(message)) != -1) {
-	ERRBUF_APPEND("Please issue below command for detailed reasons:\n\t");
-	ERRBUF_APPEND("/usr/sbin/execerror ruby ");
-	for (i=0; message[i]; i++) {
-	    ERRBUF_APPEND("\"");
-	    ERRBUF_APPEND(message[i]);
-	    ERRBUF_APPEND("\" ");
-	}
-	ERRBUF_APPEND("\n");
+        ERRBUF_APPEND("Please issue below command for detailed reasons:\n\t");
+        ERRBUF_APPEND("/usr/sbin/execerror ruby ");
+        for (i=0; message[i]; i++) {
+            ERRBUF_APPEND("\"");
+            ERRBUF_APPEND(message[i]);
+            ERRBUF_APPEND("\" ");
+        }
+        ERRBUF_APPEND("\n");
     }
     else {
-	ERRBUF_APPEND(strerror(errno));
-	ERRBUF_APPEND("[loadquery failed]");
+        ERRBUF_APPEND(strerror(errno));
+        ERRBUF_APPEND("[loadquery failed]");
     }
     dln_loaderror("%s", errbuf);
 }
@@ -229,22 +243,22 @@ rb_w32_check_imported(HMODULE ext, HMODULE mine)
     desc = ImageDirectoryEntryToData(ext, TRUE, IMAGE_DIRECTORY_ENTRY_IMPORT, &size);
     if (!desc) return 0;
     while (desc->Name) {
-	PIMAGE_THUNK_DATA pint = (PIMAGE_THUNK_DATA)((char *)ext + desc->Characteristics);
-	PIMAGE_THUNK_DATA piat = (PIMAGE_THUNK_DATA)((char *)ext + desc->FirstThunk);
-	for (; piat->u1.Function; piat++, pint++) {
-	    static const char prefix[] = "rb_";
-	    PIMAGE_IMPORT_BY_NAME pii;
-	    const char *name;
-
-	    if (IMAGE_SNAP_BY_ORDINAL(pint->u1.Ordinal)) continue;
-	    pii = (PIMAGE_IMPORT_BY_NAME)((char *)ext + (size_t)pint->u1.AddressOfData);
-	    name = (const char *)pii->Name;
-	    if (strncmp(name, prefix, sizeof(prefix) - 1) == 0) {
-		FARPROC addr = GetProcAddress(mine, name);
-		if (addr) return (FARPROC)piat->u1.Function == addr;
-	    }
-	}
-	desc++;
+        PIMAGE_THUNK_DATA pint = (PIMAGE_THUNK_DATA)((char *)ext + desc->Characteristics);
+        PIMAGE_THUNK_DATA piat = (PIMAGE_THUNK_DATA)((char *)ext + desc->FirstThunk);
+        for (; piat->u1.Function; piat++, pint++) {
+            static const char prefix[] = "rb_";
+            PIMAGE_IMPORT_BY_NAME pii;
+            const char *name;
+
+            if (IMAGE_SNAP_BY_ORDINAL(pint->u1.Ordinal)) continue;
+            pii = (PIMAGE_IMPORT_BY_NAME)((char *)ext + (size_t)pint->u1.AddressOfData);
+            name = (const char *)pii->Name;
+            if (strncmp(name, prefix, sizeof(prefix) - 1) == 0) {
+                FARPROC addr = GetProcAddress(mine, name);
+                if (addr) return (FARPROC)piat->u1.Function == addr;
+            }
+        }
+        desc++;
     }
     return 1;
 }
@@ -252,11 +266,11 @@ rb_w32_check_imported(HMODULE ext, HMODULE mine)
 
 #if defined(DLN_NEEDS_ALT_SEPARATOR) && DLN_NEEDS_ALT_SEPARATOR
 #define translit_separator(src) do { \
-	char *tmp = ALLOCA_N(char, strlen(src) + 1), *p = tmp, c; \
-	do { \
-	    *p++ = ((c = *file++) == '/') ? DLN_NEEDS_ALT_SEPARATOR : c; \
-	} while (c); \
-	(src) = tmp; \
+        char *tmp = ALLOCA_N(char, strlen(src) + 1), *p = tmp, c; \
+        do { \
+            *p++ = ((c = *file++) == '/') ? DLN_NEEDS_ALT_SEPARATOR : c; \
+        } while (c); \
+        (src) = tmp; \
     } while (0)
 #else
 #define translit_separator(str) (void)(str)
@@ -268,13 +282,15 @@ rb_w32_check_imported(HMODULE ext, HMODULE mine)
 static bool
 dln_incompatible_func(void *handle, const char *funcname, void *const fp, const char **libname)
 {
-    Dl_info dli;
     void *ex = dlsym(handle, funcname);
     if (!ex) return false;
     if (ex == fp) return false;
+#  if defined(HAVE_DLADDR) && !defined(__CYGWIN__)
+    Dl_info dli;
     if (dladdr(ex, &dli)) {
-	*libname = dli.dli_fname;
+        *libname = dli.dli_fname;
     }
+#  endif
     return true;
 }
 
@@ -287,15 +303,28 @@ dln_incompatible_library_p(void *handle, const char **libname)
 {
 #define check_func(func) \
     if (dln_incompatible_func(handle, EXTERNAL_PREFIX #func, (void *)&func, libname)) \
-	return true
+        return true
     check_func(ruby_xmalloc);
     return false;
 }
 COMPILER_WARNING_POP
 #endif
 
-#if defined(MAC_OS_X_VERSION_MIN_REQUIRED) && \
-    (MAC_OS_X_VERSION_MIN_REQUIRED < MAC_OS_X_VERSION_10_11)
+#if !defined(MAC_OS_X_VERSION_MIN_REQUIRED)
+/* assume others than old Mac OS X have no problem */
+# define dln_disable_dlclose() false
+
+#elif !defined(MAC_OS_X_VERSION_10_11) || \
+    (MAC_OS_X_VERSION_MAX_ALLOWED < MAC_OS_X_VERSION_10_11)
+/* targeting older versions only */
+# define dln_disable_dlclose() true
+
+#elif MAC_OS_X_VERSION_MIN_REQUIRED >= MAC_OS_X_VERSION_10_11
+/* targeting newer versions only */
+# define dln_disable_dlclose() false
+
+#else
+/* support both versions, and check at runtime */
 # include <sys/sysctl.h>
 
 static bool
@@ -308,8 +337,6 @@ dln_disable_dlclose(void)
     if (rev < MAC_OS_X_VERSION_10_11) return true;
     return false;
 }
-#else
-# define dln_disable_dlclose() false
 #endif
 
 #if defined(_WIN32) || defined(USE_DLN_DLOPEN)
@@ -326,7 +353,7 @@ dln_open(const char *file)
     /* Convert the file path to wide char */
     WCHAR *winfile = rb_w32_mbstr_to_wstr(CP_UTF8, file, -1, NULL);
     if (!winfile) {
-	dln_memerror();
+        dln_memerror();
     }
 
     /* Load file */
@@ -334,15 +361,15 @@ dln_open(const char *file)
     free(winfile);
 
     if (!handle) {
-	error = dln_strerror();
-	goto failed;
+        error = dln_strerror();
+        goto failed;
     }
 
 # if defined(RUBY_EXPORT)
     if (!rb_w32_check_imported(handle, rb_libruby_handle())) {
-	FreeLibrary(handle);
-	error = incompatible;
-	goto failed;
+        FreeLibrary(handle);
+        error = incompatible;
+        goto failed;
     }
 # endif
 
@@ -357,9 +384,13 @@ dln_open(const char *file)
 # ifndef RTLD_GLOBAL
 #  define RTLD_GLOBAL 0
 # endif
+# ifndef RTLD_LOCAL
+#  define RTLD_LOCAL 0 /* TODO: 0??? some systems (including libc) use 0x00100 for RTLD_GLOBAL, 0x00000 for RTLD_LOCAL */
+# endif
 
     /* Load file */
-    handle = dlopen(file, RTLD_LAZY|RTLD_GLOBAL);
+    int mode = rb_box_available() ? RTLD_LAZY|RTLD_LOCAL : RTLD_LAZY|RTLD_GLOBAL;
+    handle = dlopen(file, mode);
     if (handle == NULL) {
         error = dln_strerror();
         goto failed;
@@ -367,24 +398,30 @@ dln_open(const char *file)
 
 # if defined(RUBY_EXPORT)
     {
-	const char *libruby_name = NULL;
-	if (dln_incompatible_library_p(handle, &libruby_name)) {
-	    if (dln_disable_dlclose()) {
-		/* dlclose() segfaults */
-		if (libruby_name) {
-		    dln_fatalerror("linked to incompatible %s - %s", libruby_name, file);
-		}
-		dln_fatalerror("%s - %s", incompatible, file);
-	    }
-	    else {
-		dlclose(handle);
-		if (libruby_name) {
-		    dln_loaderror("linked to incompatible %s - %s", libruby_name, file);
-		}
-		error = incompatible;
-		goto failed;
-	    }
-	}
+        const char *libruby_name = NULL;
+        if (dln_incompatible_library_p(handle, &libruby_name)) {
+            if (dln_disable_dlclose()) {
+                /* dlclose() segfaults */
+                if (libruby_name) {
+                    dln_fatalerror("linked to incompatible %s - %s", libruby_name, file);
+                }
+                dln_fatalerror("%s - %s", incompatible, file);
+            }
+            else {
+                if (libruby_name) {
+                    const size_t len = strlen(libruby_name);
+                    char *const tmp = ALLOCA_N(char, len + 1);
+                    if (tmp) memcpy(tmp, libruby_name, len + 1);
+                    libruby_name = tmp;
+                }
+                dlclose(handle);
+                if (libruby_name) {
+                    dln_loaderror("linked to incompatible %s - %s", libruby_name, file);
+                }
+                error = incompatible;
+                goto failed;
+            }
+        }
     }
 # endif
 #endif
@@ -398,33 +435,63 @@ dln_open(const char *file)
 static void *
 dln_sym(void *handle, const char *symbol)
 {
-    void *func;
-    const char *error;
-
 #if defined(_WIN32)
-    char message[1024];
+    return GetProcAddress(handle, symbol);
+#elif defined(USE_DLN_DLOPEN)
+    return dlsym(handle, symbol);
+#endif
+}
+
+static uintptr_t
+dln_sym_func(void *handle, const char *symbol)
+{
+    void *func = dln_sym(handle, symbol);
 
-    func = GetProcAddress(handle, symbol);
     if (func == NULL) {
+        const char *error;
+#if defined(_WIN32)
+        char message[1024];
         error = dln_strerror();
-        goto failed;
-    }
-
 #elif defined(USE_DLN_DLOPEN)
-    func = dlsym(handle, symbol);
-    if (func == NULL) {
         const size_t errlen = strlen(error = dln_strerror()) + 1;
         error = memcpy(ALLOCA_N(char, errlen), error, errlen);
-        goto failed;
-    }
 #endif
+        dln_loaderror("%s - %s", error, symbol);
+    }
+    return (uintptr_t)func;
+}
 
-    return func;
+#define dln_sym_callable(rettype, argtype, handle, symbol) \
+    (*(rettype (*)argtype)dln_sym_func(handle, symbol))
+#endif
 
-  failed:
-    dln_loaderror("%s - %s", error, symbol);
-}
+void *
+dln_symbol(void *handle, const char *symbol)
+{
+#if defined(_WIN32) || defined(USE_DLN_DLOPEN)
+    if (EXTERNAL_PREFIX[0]) {
+        const size_t symlen = strlen(symbol);
+        char *const tmp = ALLOCA_N(char, symlen + sizeof(EXTERNAL_PREFIX));
+        if (!tmp) dln_memerror();
+        memcpy(tmp, EXTERNAL_PREFIX, sizeof(EXTERNAL_PREFIX) - 1);
+        memcpy(tmp + sizeof(EXTERNAL_PREFIX) - 1, symbol, symlen + 1);
+        symbol = tmp;
+    }
+    if (handle == NULL) {
+# if defined(USE_DLN_DLOPEN)
+        handle = dlopen(NULL, RTLD_LAZY | RTLD_GLOBAL);
+# elif defined(_WIN32)
+        handle = rb_libruby_handle();
+# else
+        return NULL;
+# endif
+    }
+    return dln_sym(handle, symbol);
+#else
+    return NULL;
 #endif
+}
+
 
 #if defined(RUBY_DLN_CHECK_ABI) && defined(USE_DLN_DLOPEN)
 static bool
@@ -435,42 +502,40 @@ abi_check_enabled_p(void)
 }
 #endif
 
-void *
-dln_load(const char *file)
+static void *
+dln_load_and_init(const char *file, const char *init_fct_name)
 {
 #if defined(_WIN32) || defined(USE_DLN_DLOPEN)
     void *handle = dln_open(file);
 
 #ifdef RUBY_DLN_CHECK_ABI
-    unsigned long long (*abi_version_fct)(void) = (unsigned long long(*)(void))dln_sym(handle, "ruby_abi_version");
-    unsigned long long binary_abi_version = (*abi_version_fct)();
-    if (binary_abi_version != ruby_abi_version() && abi_check_enabled_p()) {
-        dln_loaderror("ABI version of binary is incompatible with this Ruby. Try rebuilding this binary.");
+    typedef unsigned long long abi_version_number;
+    abi_version_number binary_abi_version =
+        dln_sym_callable(abi_version_number, (void), handle, EXTERNAL_PREFIX "ruby_abi_version")();
+    if (binary_abi_version != RUBY_ABI_VERSION && abi_check_enabled_p()) {
+        dln_loaderror("incompatible ABI version of binary - %s", file);
     }
 #endif
 
-    char *init_fct_name;
-    init_funcname(&init_fct_name, file);
-    void (*init_fct)(void) = (void(*)(void))dln_sym(handle, init_fct_name);
-
     /* Call the init code */
-    (*init_fct)();
+    dln_sym_callable(void, (void), handle, init_fct_name)();
 
     return handle;
 
 #elif defined(_AIX)
     {
-	void (*init_fct)(void);
-
-	init_fct = (void(*)(void))load((char*)file, 1, 0);
-	if (init_fct == NULL) {
-	    aix_loaderror(file);
-	}
-	if (loadbind(0, (void*)dln_load, (void*)init_fct) == -1) {
-	    aix_loaderror(file);
-	}
-	(*init_fct)();
-	return (void*)init_fct;
+        void (*init_fct)(void);
+
+        /* TODO: check - AIX's load system call will return the first/last symbol/function? */
+        init_fct = (void(*)(void))load((char*)file, 1, 0);
+        if (init_fct == NULL) {
+            aix_loaderror(file);
+        }
+        if (loadbind(0, (void*)dln_load, (void*)init_fct) == -1) {
+            aix_loaderror(file);
+        }
+        (*init_fct)();
+        return (void*)init_fct;
     }
 #else
     dln_notimplement();
@@ -478,3 +543,29 @@ dln_load(const char *file)
 
     return 0;			/* dummy return */
 }
+
+void *
+dln_load(const char *file)
+{
+#if defined(_WIN32) || defined(USE_DLN_DLOPEN)
+    char *init_fct_name;
+    init_funcname(&init_fct_name, file);
+    return dln_load_and_init(file, init_fct_name);
+#else
+    dln_notimplement();
+    return 0;
+#endif
+}
+
+void *
+dln_load_feature(const char *file, const char *fname)
+{
+#if defined(_WIN32) || defined(USE_DLN_DLOPEN)
+    char *init_fct_name;
+    init_funcname(&init_fct_name, fname);
+    return dln_load_and_init(file, init_fct_name);
+#else
+    dln_notimplement();
+    return 0;
+#endif
+}
diff --git a/dln.h b/dln.h
index 902f753450..711abf592c 100644
--- a/dln.h
+++ b/dln.h
@@ -25,6 +25,8 @@ RUBY_SYMBOL_EXPORT_BEGIN
 char *dln_find_exe_r(const char*,const char*,char*,size_t DLN_FIND_EXTRA_ARG_DECL);
 char *dln_find_file_r(const char*,const char*,char*,size_t DLN_FIND_EXTRA_ARG_DECL);
 void *dln_load(const char*);
+void *dln_load_feature(const char*, const char*);
+void *dln_symbol(void*,const char*);
 
 RUBY_SYMBOL_EXPORT_END
 
diff --git a/dln_find.c b/dln_find.c
index 96e06d34c4..ae37b9dde4 100644
--- a/dln_find.c
+++ b/dln_find.c
@@ -11,11 +11,9 @@
 
 #ifdef RUBY_EXPORT
 #include "ruby/ruby.h"
-#define dln_warning rb_warning
-#define dln_warning_arg
+#define dln_warning(...) rb_warning(__VA_ARGS__)
 #else
-#define dln_warning fprintf
-#define dln_warning_arg stderr,
+#define dln_warning(...) fprintf(stderr, __VA_ARGS__)
 #endif
 #include "dln.h"
 
@@ -53,35 +51,35 @@ char *getenv();
 #endif
 
 static char *dln_find_1(const char *fname, const char *path, char *buf, size_t size, int exe_flag
-			DLN_FIND_EXTRA_ARG_DECL);
+                        DLN_FIND_EXTRA_ARG_DECL);
 
 char *
 dln_find_exe_r(const char *fname, const char *path, char *buf, size_t size
-	       DLN_FIND_EXTRA_ARG_DECL)
+               DLN_FIND_EXTRA_ARG_DECL)
 {
     char *envpath = 0;
 
     if (!path) {
-	path = getenv(PATH_ENV);
-	if (path) path = envpath = strdup(path);
+        path = getenv(PATH_ENV);
+        if (path) path = envpath = strdup(path);
     }
 
     if (!path) {
-	path =
-	    "/usr/local/bin" PATH_SEP
-	    "/usr/ucb" PATH_SEP
-	    "/usr/bin" PATH_SEP
-	    "/bin" PATH_SEP
-	    ".";
+        path =
+            "/usr/local/bin" PATH_SEP
+            "/usr/ucb" PATH_SEP
+            "/usr/bin" PATH_SEP
+            "/bin" PATH_SEP
+            ".";
     }
     buf = dln_find_1(fname, path, buf, size, 1 DLN_FIND_EXTRA_ARG);
-    if (envpath) free(envpath);
+    free(envpath);
     return buf;
 }
 
 char *
 dln_find_file_r(const char *fname, const char *path, char *buf, size_t size
-		DLN_FIND_EXTRA_ARG_DECL)
+                DLN_FIND_EXTRA_ARG_DECL)
 {
     if (!path) path = ".";
     return dln_find_1(fname, path, buf, size, 0 DLN_FIND_EXTRA_ARG);
@@ -89,8 +87,8 @@ dln_find_file_r(const char *fname, const char *path, char *buf, size_t size
 
 static char *
 dln_find_1(const char *fname, const char *path, char *fbuf, size_t size,
-	   int exe_flag /* non 0 if looking for executable. */
-	   DLN_FIND_EXTRA_ARG_DECL)
+           int exe_flag /* non 0 if looking for executable. */
+           DLN_FIND_EXTRA_ARG_DECL)
 {
     register const char *dp;
     register const char *ep;
@@ -99,7 +97,7 @@ dln_find_1(const char *fname, const char *path, char *fbuf, size_t size,
     size_t i, fnlen, fspace;
 #ifdef DOSISH
     static const char extension[][5] = {
-	EXECUTABLE_EXTS,
+        EXECUTABLE_EXTS,
     };
     size_t j;
     int is_abs = 0, has_path = 0;
@@ -109,22 +107,21 @@ dln_find_1(const char *fname, const char *path, char *fbuf, size_t size,
 
     static const char pathname_too_long[] = "openpath: pathname too long (ignored)\n\
 \tDirectory \"%.*s\"%s\n\tFile \"%.*s\"%s\n";
-#define PATHNAME_TOO_LONG() dln_warning(dln_warning_arg pathname_too_long, \
-					((bp - fbuf) > 100 ? 100 : (int)(bp - fbuf)), fbuf, \
-					((bp - fbuf) > 100 ? "..." : ""), \
-					(fnlen > 100 ? 100 : (int)fnlen), fname, \
-					(fnlen > 100 ? "..." : ""))
+#define PATHNAME_TOO_LONG() dln_warning(pathname_too_long, \
+                                        ((bp - fbuf) > 100 ? 100 : (int)(bp - fbuf)), fbuf, \
+                                        ((bp - fbuf) > 100 ? "..." : ""), \
+                                        (fnlen > 100 ? 100 : (int)fnlen), fname, \
+                                        (fnlen > 100 ? "..." : ""))
 
 #define RETURN_IF(expr) if (expr) return (char *)fname;
 
     RETURN_IF(!fname);
     fnlen = strlen(fname);
     if (fnlen >= size) {
-	dln_warning(dln_warning_arg
-		    "openpath: pathname too long (ignored)\n\tFile \"%.*s\"%s\n",
-		    (fnlen > 100 ? 100 : (int)fnlen), fname,
-		    (fnlen > 100 ? "..." : ""));
-	return NULL;
+        dln_warning("openpath: pathname too long (ignored)\n\tFile \"%.*s\"%s\n",
+                    (fnlen > 100 ? 100 : (int)fnlen), fname,
+                    (fnlen > 100 ? "..." : ""));
+        return NULL;
     }
 #ifdef DOSISH
 # ifndef CharNext
@@ -132,52 +129,52 @@ dln_find_1(const char *fname, const char *path, char *fbuf, size_t size,
 # endif
 # ifdef DOSISH_DRIVE_LETTER
     if (((p[0] | 0x20) - 'a') < 26  && p[1] == ':') {
-	p += 2;
-	is_abs = 1;
+        p += 2;
+        is_abs = 1;
     }
 # endif
     switch (*p) {
       case '/': case '\\':
-	is_abs = 1;
-	p++;
+        is_abs = 1;
+        p++;
     }
     has_path = is_abs;
     while (*p) {
-	switch (*p) {
-	  case '/': case '\\':
-	    has_path = 1;
-	    ext = 0;
-	    p++;
-	    break;
-	  case '.':
-	    ext = p;
-	    p++;
-	    break;
-	  default:
-	    p = CharNext(p);
-	}
+        switch (*p) {
+          case '/': case '\\':
+            has_path = 1;
+            ext = 0;
+            p++;
+            break;
+          case '.':
+            ext = p;
+            p++;
+            break;
+          default:
+            p = CharNext(p);
+        }
     }
     if (ext) {
-	for (j = 0; STRCASECMP(ext, extension[j]); ) {
-	    if (++j == sizeof(extension) / sizeof(extension[0])) {
-		ext = 0;
-		break;
-	    }
-	}
+        for (j = 0; STRCASECMP(ext, extension[j]); ) {
+            if (++j == sizeof(extension) / sizeof(extension[0])) {
+                ext = 0;
+                break;
+            }
+        }
     }
     ep = bp = 0;
     if (!exe_flag) {
-	RETURN_IF(is_abs);
+        RETURN_IF(is_abs);
     }
     else if (has_path) {
-	RETURN_IF(ext);
-	i = p - fname;
-	if (i + 1 > size) goto toolong;
-	fspace = size - i - 1;
-	bp = fbuf;
-	ep = p;
-	memcpy(fbuf, fname, i + 1);
-	goto needs_extension;
+        RETURN_IF(ext);
+        i = p - fname;
+        if (i + 1 > size) goto toolong;
+        fspace = size - i - 1;
+        bp = fbuf;
+        ep = p;
+        memcpy(fbuf, fname, i + 1);
+        goto needs_extension;
     }
     p = fname;
 #endif
@@ -189,85 +186,85 @@ dln_find_1(const char *fname, const char *path, char *fbuf, size_t size,
 #undef RETURN_IF
 
     for (dp = path;; dp = ++ep) {
-	register size_t l;
-
-	/* extract a component */
-	ep = strchr(dp, PATH_SEP[0]);
-	if (ep == NULL)
-	    ep = dp+strlen(dp);
-
-	/* find the length of that component */
-	l = ep - dp;
-	bp = fbuf;
-	fspace = size - 2;
-	if (l > 0) {
-	    /*
-	    **	If the length of the component is zero length,
-	    **	start from the current directory.  If the
-	    **	component begins with "~", start from the
-	    **	user's $HOME environment variable.  Otherwise
-	    **	take the path literally.
-	    */
-
-	    if (*dp == '~' && (l == 1 ||
+        register size_t l;
+
+        /* extract a component */
+        ep = strchr(dp, PATH_SEP[0]);
+        if (ep == NULL)
+            ep = dp+strlen(dp);
+
+        /* find the length of that component */
+        l = ep - dp;
+        bp = fbuf;
+        fspace = size - 2;
+        if (l > 0) {
+            /*
+            **	If the length of the component is zero length,
+            **	start from the current directory.  If the
+            **	component begins with "~", start from the
+            **	user's $HOME environment variable.  Otherwise
+            **	take the path literally.
+            */
+
+            if (*dp == '~' && (l == 1 ||
 #if defined(DOSISH)
-			       dp[1] == '\\' ||
+                               dp[1] == '\\' ||
 #endif
-			       dp[1] == '/')) {
-		const char *home;
-
-		home = getenv("HOME");
-		if (home != NULL) {
-		    i = strlen(home);
-		    if (fspace < i)
-			goto toolong;
-		    fspace -= i;
-		    memcpy(bp, home, i);
-		    bp += i;
-		}
-		dp++;
-		l--;
-	    }
-	    if (l > 0) {
-		if (fspace < l)
-		    goto toolong;
-		fspace -= l;
-		memcpy(bp, dp, l);
-		bp += l;
-	    }
-
-	    /* add a "/" between directory and filename */
-	    if (ep[-1] != '/')
-		*bp++ = '/';
-	}
-
-	/* now append the file name */
-	i = fnlen;
-	if (fspace < i) {
+                               dp[1] == '/')) {
+                const char *home;
+
+                home = getenv("HOME");
+                if (home != NULL) {
+                    i = strlen(home);
+                    if (fspace < i)
+                        goto toolong;
+                    fspace -= i;
+                    memcpy(bp, home, i);
+                    bp += i;
+                }
+                dp++;
+                l--;
+            }
+            if (l > 0) {
+                if (fspace < l)
+                    goto toolong;
+                fspace -= l;
+                memcpy(bp, dp, l);
+                bp += l;
+            }
+
+            /* add a "/" between directory and filename */
+            if (ep[-1] != '/')
+                *bp++ = '/';
+        }
+
+        /* now append the file name */
+        i = fnlen;
+        if (fspace < i) {
             goto toolong;
-	}
-	fspace -= i;
-	memcpy(bp, fname, i + 1);
+        }
+        fspace -= i;
+        memcpy(bp, fname, i + 1);
 
 #if defined(DOSISH)
-	if (exe_flag && !ext) {
+        if (exe_flag && !ext) {
             goto needs_extension;
-	}
+        }
 #endif
 
 #ifndef S_ISREG
 # define S_ISREG(m) (((m) & S_IFMT) == S_IFREG)
 #endif
-	if (stat(fbuf, &st) == 0 && S_ISREG(st.st_mode)) {
-	    if (exe_flag == 0) return fbuf;
-	    /* looking for executable */
-	    if (eaccess(fbuf, X_OK) == 0) return fbuf;
-	}
+        if (stat(fbuf, &st) == 0 && S_ISREG(st.st_mode)) {
+            if (exe_flag == 0) return fbuf;
+            /* looking for executable */
+            if (eaccess(fbuf, X_OK) == 0) return fbuf;
+        }
       next:
-	/* if not, and no other alternatives, life is bleak */
-	if (*ep == '\0') {
-	    return NULL;
-	}
+        /* if not, and no other alternatives, life is bleak */
+        if (*ep == '\0') {
+            return NULL;
+        }
         continue;
 
       toolong:
@@ -287,6 +284,6 @@ dln_find_1(const char *fname, const char *path, char *fbuf, size_t size,
         }
         goto next;
 #endif
-	/* otherwise try the next component in the search path */
+        /* otherwise try the next component in the search path */
     }
 }
diff --git a/dmydln.c b/dmydln.c
index d05cda0b8e..62a89e2da5 100644
--- a/dmydln.c
+++ b/dmydln.c
@@ -1,3 +1,6 @@
+// This file is used by miniruby, not ruby.
+// ruby uses dln.c.
+
 #include "ruby/ruby.h"
 
 NORETURN(void *dln_load(const char *));
@@ -8,3 +11,21 @@ dln_load(const char *file)
 
     UNREACHABLE_RETURN(NULL);
 }
+
+NORETURN(void *dln_load_feature(const char*,const char*));
+void*
+dln_load_feature(const char *file, const char *fname)
+{
+    rb_loaderror("this executable file can't load extension libraries");
+
+    UNREACHABLE_RETURN(NULL);
+}
+
+NORETURN(void *dln_symbol(void*,const char*));
+void*
+dln_symbol(void *handle, const char *symbol)
+{
+    rb_loaderror("this executable file can't load extension libraries");
+
+    UNREACHABLE_RETURN(NULL);
+}
diff --git a/dmyenc.c b/dmyenc.c
index 7e006e826c..4771841281 100644
--- a/dmyenc.c
+++ b/dmyenc.c
@@ -1,3 +1,17 @@
+// This file is used by dynamically-linked ruby, which has no
+// statically-linked encodings other than the builtin encodings.
+//
+// - miniruby does not use this Init_enc. Instead, "miniinit.c"
+//   provides Init_enc, which defines only the builtin encodings.
+//
+// - Dynamically-linked ruby uses this Init_enc, which requires
+//   "enc/encdb.so" to load the builtin encodings and set up the
+//   optional encodings.
+//
+// - Statically-linked ruby does not use this Init_enc. Instead,
+//   "enc/encinit.c" (which is a generated file) defines Init_enc,
+//   which activates the encodings.
+
 #define require(name) ruby_require_internal(name, (unsigned int)sizeof(name)-1)
 int ruby_require_internal(const char *, int);
 
@@ -5,6 +19,6 @@ void
 Init_enc(void)
 {
     if (require("enc/encdb.so") == 1) {
-	require("enc/trans/transdb.so");
+        require("enc/trans/transdb.so");
     }
 }
diff --git a/dmyext.c b/dmyext.c
index 4d273f7faf..66be95ab4e 100644
--- a/dmyext.c
+++ b/dmyext.c
@@ -1,3 +1,17 @@
+// This file is used by dynamically-linked ruby, which has no
+// statically-linked extension libraries.
+//
+// - miniruby does not use this Init_ext. Instead, "miniinit.c"
+//   provides Init_enc, which does nothing too. It does not support
+//   require'ing extension libraries.
+//
+// - Dynamically-linked ruby uses this Init_ext, which does
+//   nothing. It loads extension libraries by dlopen, etc.
+//
+// - Statically-linked ruby does not use this Init_ext. Instead,
+//   "ext/extinit.c" (which is a generated file) defines Init_ext,
+//   which activates the (statically-linked) extension libraries.
+
 void
 Init_ext(void)
 {
diff --git a/doc/.document b/doc/.document
index 03d332367c..3a95c9617b 100644
--- a/doc/.document
+++ b/doc/.document
@@ -1,7 +1,13 @@
-*.md
-*.rb
-*.rdoc
+[^_]*.md
+[^_]*.rb
+[^_]*.rdoc
 contributing
+distribution
 NEWS
 syntax
 optparse
+date
+rdoc
+jit
+security
+language
diff --git a/doc/ChangeLog-1.9.3 b/doc/ChangeLog-1.9.3
deleted file mode 100644
index 0f80eed2d5..0000000000
--- a/doc/ChangeLog-1.9.3
+++ /dev/null
@@ -1,92772 +0,0 @@
-Sun Jul 10 22:50:00 2011  Kenta Murata  <mrkn@mrkn.jp>
-
-	* ext/bigdecimal/bigdecimal.c (rmpd_power_by_big_decimal): fix
-	  precision treatment errors.
-
-	* test/bigdecimal/test_bigdecimal.rb: add tests for the above change.
-	  fix precision treatment errors.
-
-	* ext/bigdecimal/bigdecimal.c (BigDecimal_power): precision argument
-	  should be optional for its compatibility.
-
-Sun Jul 10 22:38:09 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* parse.y (var_ref): distinguish vcall from local variable
-	  references.  based on a patch by Michael Edgar michael.j.edgar
-	  AT dartmouth.edu.  Bug #5002
-
-Sun Jul 10 21:51:29 2011  Koichi Sasada  <ko1@atdot.net>
-
-	* internal.h: add comments (cautions).
-
-Sun Jul 10 20:59:38 2011  Shota Fukumori  <sorah@tubusu.net>
-
-	* lib/test/unit.rb: Add new class variable `@@testfile_prefix`.
-	  This is for changing test name prefix. (For testing)
-
-	* test/testunit/tests_for_parallel/ptest_first.rb: Renamed from
-	  test_first.rb
-
-	* test/testunit/tests_for_parallel/ptest_second.rb: Renamed from
-	  test_second.rb
-
-	* test/testunit/tests_for_parallel/ptest_third.rb: Renamed from
-	  test_third.rb
-
-	* test/testunit/tests_for_parallel/ptest_forth.rb: Renamed from
-	  test_forth.rb
-
-	* test/testunit/tests_for_parallel/runner.rb: Remove misc.rb
-
-	* test/testunit/tests_for_parallel/ptest_first.rb: ditto.
-
-	* test/testunit/tests_for_parallel/ptest_second.rb: ditto.
-
-	* test/testunit/tests_for_parallel/ptest_third.rb: ditto.
-
-	* test/testunit/tests_for_parallel/ptest_forth.rb: ditto.
-
-	* test/testunit/tests_for_parallel/misc.rb: Removed because no longer
-	  needed.
-
-	* test/testunit/test_parallel.rb: Fix assertions for above.
-
-Sun Jul 10 16:57:08 2011  Koichi Sasada  <ko1@atdot.net>
-
-	* vm_insnhelper.c (vm_throw): check a class frame.
-	  Fixes Bug #4648.
-	  The patch is contributed by Kazuki Tsujimoto.
-
-	* bootstraptest/test_proc.rb: add tests for above.
-
-Sun Jul 10 17:28:01 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* thread_pthread.c (mutex_debug): use exit(EXIT_FAILURE) instead of
-	  exit(1).
-	* thread_pthread.c (add_signal_thread_list): ditto.
-	* thread.c (rb_thread_call_with_gvl): ditto.
-	* util.c (Bug): ditto.
-
-Sun Jul 10 15:58:12 2011  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* ext/json: Merge json gem 1.5.4+ (f7f78896607b6f6226cd).
-	  [Bug #4700]
-
-Sun Jul 10 16:41:32 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* vm_core.h (typedef struct rb_vm_struct): create a new
-	  'inhibit_thread_creation' field.
-	* thread.c (rb_thread_terminate_all): set inhibit_thread_creation.
-	* thread.c (thread_s_new): don't permit to create new thread
-	  if the VM is under destruction. Otherwise evil finalizer code
-	  can make SEGV. [Bug #4992][ruby-core:37858]
-
-	* bootstraptest/test_objectspace.rb: new test for this fix.
-
-Sun Jul 10 16:06:16 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* signal.c (sigsegv): use abort() instead of exit() when nested
-	  SEGV was happen. Because unnested SEGV use abort().
-	  [Bug #5013][ruby-dev:44078]
-
-Sun Jul 10 15:30:00 2011  Kenta Murata  <mrkn@mrkn.jp>
-
-	* load.c (rb_f_autoload): prevent to autoload for singleton
-	  classes.  fixes [Bug #4886] [ruby-dev:43816]
-
-	* bootstraptest/test_autoload.rb: add tests for the above change.
-
-Sun Jul 10 15:09:17 2011  Shota Fukumori  <sorah@tubusu.net>
-
-	* lib/test/unit/assertions.rb: Import documentation patch by Justin
-	  Collins. [ruby-core:37225] [Feature #4903]
-
-Sun Jul 10 14:57:36 2011  Tadayoshi Funaba  <tadf@dotrb.org>
-
-	* ext/date/date_core.c: canonicalizes nth and sf.
-
-Sun Jul 10 14:13:50 2011  Koichi Sasada  <ko1@atdot.net>
-
-	* internal.h (rb_thread_call_with_gvl, rb_thread_call_without_gvl):
-	  make them visible as experimental C APIs.  fixes Feature #4328.
-
-Sun Jul 10 12:18:00 2011  Kenta Murata  <mrkn@mrkn.jp>
-
-	* ext/bigdecimal/bigdecimal.c (BigDecimal_power): support non-integral
-	  exponent.  fixes [Bug #3271]
-
-	* ext/bigdecimal/bigdecimal.c (rmpd_power_by_big_decimal): ditto.
-
-	* ext/bigdecimal/bigdecimal.c (BigDecimal_power_op): add a function to
-	  only use for "**" operator.
-
-	* test/bigdecimal/test_bigdecimal.rb: add a bunch of tests for the
-	  above changes.
-
-	* ext/bigdecimal/bigdecimal.c (is_integer): add an utility function.
-
-	* ext/bigdecimal/bigdecimal.c (is_negative): ditto.
-
-	* ext/bigdecimal/bigdecimal.c (is_positive): ditto.
-
-	* ext/bigdecimal/bigdecimal.c (is_zero): ditto.
-
-	* ext/bigdecimal/bigdecimal.c (is_one): ditto.
-
-	* ext/bigdecimal/bigdecimal.c (is_even): ditto.
-
-Sun Jul 10 12:08:39 2011  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* compile.c (when_vals): when a string literal is written on when
-	  clause, skip string creation to make it faster.  [ruby-dev:44068]
-	  [Feature #5000]
-
-Sun Jul 10 11:35:29 2011  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* parse.y (reduce_nodes_gen): NODE_RETURN in rescue body must not be
-	  reduced when there is an else clause.  This caused bizarre behavior
-	  in [Bug #4473] [ruby-core:35629] [ruby-core:37884].
-
-Sun Jul 10 09:46:14 2011  Masaya Tarui  <tarui@ruby-lnag.org>
-
-	* range.c (range_max): fix behavior with excluded end value.
-	  [Bug #4591]
-
-Sun Jul 10 09:13:18 2011  Eric Hodel  <drbrain@segment7.net>
-
-	* NEWS:  Fix RubyGems version.  [Ruby 1.9 - Bug #5004]
-
-Sat Jul  9 20:01:59 2011  Tadayoshi Funaba  <tadf@dotrb.org>
-
-	* internal.h: rb_rational_reciprocal is defined in rational.c.
-
-Sat Jul  9 19:48:31 2011  Tadayoshi Funaba  <tadf@dotrb.org>
-
-	* internal.h: added declarations.
-	* complex.c: followed the above change.
-
-Sat Jul  9 17:24:41 2011  Tadayoshi Funaba  <tadf@dotrb.org>
-
-	* NEWS: bigdecimal is not a builtin.
-
-Sat Jul  9 17:17:53 2011  Tadayoshi Funaba  <tadf@dotrb.org>
-
-	* ext/date/date_core.c: some improvements for performance.
-
-Sat Jul  9 16:56:01 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* atomic.h (ATOMIC_OR): _InterlockedOr is unavailable in VC6.
-
-	* numeric.c (ULLONG_MAX): fallback definition.
-
-Sat Jul  9 15:59:19 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* win32/win32.c (rb_w32_{read,write}): should be signed.
-	  Bug #5001
-
-Sat Jul  9 14:02:20 2011  Takeyuki FUJIOKA  <xibbar@ruby-lang.org>
-
-	* lib/cgi/core.rb: fix multipart form parsing bug. [Bug #3866]
-
-Sat Jul  9 11:41:03 2011  Marc-Andre Lafortune  <ruby-core@marc-andre.ca>
-
-	* lib/matrix.rb: Add Vector#normalize [ruby-dev:43829]
-
-Sat Jul  9 09:25:06 2011  Eric Hodel  <drbrain@segment7.net>
-
-	* enumerator.c:  Remove "enumeration sequenced by".
-	  [Ruby 1.9 - Bug #4757]
-
-Sat Jul  9 09:14:56 2011  Eric Hodel  <drbrain@segment7.net>
-
-	* io.c:  Note that methods other than IO#gets may increase IO#lineno.
-	  [Ruby 1.9 - Bug #4902]
-
-Sat Jul  9 08:39:39 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* common.mk (RUN_OPT): disable gems.
-
-Sat Jul  9 08:37:05 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* io.c (rb_io_close): close(2) on a fd which is being read by
-	  another thread causes deadlock on Mac OS X 10.5
-
-Fri Jul  8 21:20:39 2011  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* addr2line.c: use USE_ELF instead of __ELF__ because Solaris
-	  doesn't define it. USE_ELF is already provided by configure.
-	  patched by Naohisa Goto. [ruby-dev:44066] [Bug #4998]
-
-	* addr2line.h: ditto.
-
-	* vm_dump.c: ditto.
-
-Fri Jul  8 16:40:38 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* ext/json/parser/parser.rl (convert_encoding): should not modify
-	  the argument.
-
-	* ext/json/parser/parser.rl (convert_encoding): no needs to use
-	  force_encoding.
-
-Fri Jul  8 15:53:31 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* error.c (rb_bug): get rid of segfault after all threads
-	  disposed.
-
-Fri Jul  8 15:01:06 2011  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* ext/openssl/ossl.h: include openssl/e_os2.h before checking the
-	  definition of OPENSSL_SYS_WIN32.
-
-Fri Jul  8 14:40:39 2011  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* win32/win32.c (wunlink): reverted a part of r32426. it was mistakenly
-	  mixed.
-
-Fri Jul  8 14:29:47 2011  Narihiro Nakamura  <authornari@gmail.com>
-
-	* configure.in: can't subtract void *.
-
-Fri Jul  8 14:33:26 2011  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* win32/Makefile.sub (config.h): define GC_MARK_STACKFRAME_WORD.
-	  fixed build problem of r32438.  the value (30) is temporary value.
-	  maybe it's enough by 20~24 according to my observation.
-
-Fri Jul  8 13:47:39 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* thread.c (rb_mutex_unlock_all): folded into
-	  rb_threadptr_unlock_all_locking_mutexes.
-	* thread.c (rb_threadptr_unlock_all_locking_mutexes) ditto.
-
-Fri Jul  8 13:36:02 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* thread.c (thread_unlock_all_locking_mutexes): rename to
-	  rb_threadptr_unlock_all_locking_mutexes and remove static.
-	* vm_core.h: add rb_threadptr_unlock_all_locking_mutexes declaration.
-	* thread.c (thread_start_func_2): adjust the above rename.
-
-	* eval.c (ruby_cleanup): call rb_threadptr_unlock_all_locking_mutexes
-	  again after finalizer. [Bug #4988] [ruby-dev:44049]
-
-Fri Jul  8 13:06:09 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* cont.c (FIBER_MACHINE_STACK_ALLOCATION_SIZE): Fiber stack size
-	  don't need to keep multiple number of sizeof(VALUE).
-
-Fri Jul  8 11:39:12 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* common.mk (sudo-precheck): true command is not standard on
-	  Windows.
-
-Fri Jul  8 10:39:52 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* thread_pthread.c (gvl_destroy): fix cond_t leak.
-
-Fri Jul  8 09:17:59 2011  Eric Hodel  <drbrain@segment7.net>
-
-	* gc.c:  Improve documentation
-
-Thu Jul  7 23:35:31 2011  Narihiro Nakamura  <authornari@gmail.com>
-
-	* gc.c: change water_mark value that may call
-	  gc_mark(lev <= GC_LEVEL_MAX) in gc_mark().
-	  In ruby_stack_check(), water_mark is a value that may call some
-	  C function. Fixes Bug #3781
-
-	* configure.in: define GC_MARK_STACKFRAME_WORD that approximate
-	  size of gc_mark() and gc_mark_children() stackframes.
-
-Thu Jul  7 17:55:05 2011  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* test/testunit/test_parallel.rb (TestParallelWorker#teardown): wait
-	  the child process even if the communication pipe is broken.
-
-Thu Jul  7 15:44:42 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* encoding.c (rb_enc_set_index, rb_enc_associate_index): should
-	  check if frozen.
-
-	* parse.y (rb_intern3), ruby.c (process_options, ruby_script):
-	  defer freezing after associating encodings.
-
-Thu Jul  7 15:16:51 2011  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* numeric.c (rb_num2ull): use own switch sentence.
-	  Current implementation can't convert 18446744073709551615.
-
-Thu Jul  7 06:56:15 2011  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* cont.c (FIBER_STACK_FLAGS): workaround fix for r32420 on FreeBSD.
-
-Thu Jul  7 06:46:12 2011  Eric Hodel  <drbrain@segment7.net>
-
-	* benchmark/driver.rb:  Add difference column to report that averages
-	  across all runs of a benchmark.  [Ruby 1.9 - Feature #4982]
-
-Thu Jul  7 06:19:38 2011  Eric Hodel  <drbrain@segment7.net>
-
-	* lib/rubygems.rb:  Reduce requires to improve `make benchmark`.
-	  [#4962]
-	* lib/rubygems/specification.rb:  Delay initialization of rubygems
-	  until require is called.
-
-Thu Jul  7 04:31:26 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* parse.y (arg): rescue_mod is in inverse order from other
-	  modifiers.  patched by michael.j.edgar AT dartmouth.edu at
-	  [ruby-core:36248].  fixed #4716.
-
-Thu Jul  7 00:40:16 2011  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* win32/win32.c (kill): check that the process exited or not before
-	  terminating it. [Bug #4943]
-
-Wed Jul  6 23:13:19 2011  Yukihiro Matsumoto  <matz@ruby-lang.org>
-
-	* parse.y (opt_call_args): allow trailing comma after assoc
-	  argument e.g. 'foo(bar:1,)'.  fixed #3456
-
-Wed Jul  6 22:11:12 2011  Shota Fukumori  <sorah@tubusu.net>
-
-	* test/cgi/test_cgi_header.rb(test_cgi_header_nph): Validate date in
-	  "Date:" header
-
-Wed Jul  6 21:29:33 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* cont.c (fiber_machine_stack_alloc): cleanup pointer arithmetic.
-	  "size/sizeof(VALUE)" is ugly and easy confusing.
-	* cont.c (fiber_initialize_machine_stack_context): ditto.
-
-Wed Jul  6 21:24:53 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* cont.c (fiber_machine_stack_alloc): fix mprotect misuse. A stack
-	  guard page should have PROT_NONE.
-	* cont.c (fiber_initialize_machine_stack_context):
-	  th->machine_stack_maxsize shouldn't be included guard pages size.
-	  [Bug #4983][ruby-dev:44043]
-
-Wed Jul  6 21:23:38 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* cont.c (fiber_machine_stack_alloc): use MAP_STACK if it's provided.
-
-Wed Jul  6 21:22:16 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* cont.c (fiber_machine_stack_alloc): use MAP_FAILED instead of -1.
-
-Wed Jul  6 21:21:05 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* cont.c (fiber_machine_stack_alloc): remove unnecessary cast.
-
-Wed Jul  6 18:10:13 2011  Shota Fukumori  <sorah@tubusu.net>
-
-	* test/cgi/test_cgi_header.rb(test_cgi_header_nph): Adding space after
-	  comma.
-
-	* test/cgi/test_cgi_header.rb(test_cgi_header_nph): Remove variable
-	  `now`. Suppress warning.
-
-Wed Jul  6 12:18:09 2011  Shota Fukumori  <sorah@tubusu.net>
-
-	* test/cgi/test_cgi_header.rb(test_cgi_header_nph): Fix bug depends to
-	  time. The test fails if time past 1 second in line 136-145
-
-Tue Jul  5 15:28:04 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* parse.y (parser_here_document): should dispatch heredoc_end
-	  scanner event on an empty here document.  fixed Bug#4543.
-
-Tue Jul  5 13:49:26 2011  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* addr2line.c: fix r32407 to check HAVE_ALLOCA_H.
-
-Tue Jul  5 14:05:43 2011  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* lib/webrick/httpauth/digestauth.rb (_authenticate):
-	  Literal texts in HTTP ABNF is case-insensitive (RFC2616 2.1),
-	  and a sample implementation in RFC2617 also ignores the case
-	  of algorithms. So now this ignores those cases.
-	  [ruby-dev:43965] [Feature #4936]
-
-	* lib/webrick/httpauth/digestauth.rb (initialize):
-	  Because of above, opera_hack is useless and removed.
-
-Tue Jul  5 01:30:01 2011  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* thread_pthread.c (native_sleep): cut the waiting time up to
-	  100,000,000 because Solaris cond_timedwait() return EINVAL if an
-	  argument is greater than current_time + 100,000,000.  This is
-	  considered as a kind of spurious wakeup.  The caller to native_sleep
-	  should care about spurious wakeup.
-
-Tue Jul  5 01:24:26 2011  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* cont.c: disable FIBER_USE_NATIVE on Solaris because resuming any
-	  Fiber caused SEGV.  I haven't follow up the issue deeply, but it
-	  works when disabling the feature.
-
-Tue Jul  5 01:22:46 2011  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* addr2line.c: include <alloca.h> to fix a build issue on Solaris.
-
-Tue Jul  5 00:49:05 2011  CHIKANAGA Tomoyuki  <nagachika00@gmail.com>
-
-	* ext/coverage/coverage.c: resurrect r32071 + add GC guard for
-	  rb_coverages. [ruby-core:37352] [Bug #4927]
-	  [ruby-core:36539] [Feature #4796]
-
-	* test/coverage/test_coverage.rb resurrect r32071.
-
-Mon Jul  4 22:24:46 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* thread_pthread.c (get_stack): For NetBSD/FreeBSD, use
-	  pthread_attr_getstack() if possible. and, remove an assumption
-	  of stack growing direction.
-
-Mon Jul  4 20:42:31 2011  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* ext/coverage/coverage.c: revert r32071.  The commit caused SEGV on
-	  some minor nonfree OS.  I have no means of debugging the bug.  My
-	  personal opinion is that such OS should be unsupported unless there
-	  is an active maintainer.  [ruby-core:37352]
-
-	* test/coverage/test_coverage.rb: ditto.
-
-Mon Jul  4 07:14:12 2011  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* thread_pthread.c (get_stack): the return address of get_stack
-	  must be the highest address of the current thread's stack.
-
-Mon Jul  4 06:37:22 2011  Koichi Sasada  <ko1@atdot.net>
-
-	* include/ruby/intern.h, thread_pthread.c (rb_reserved_fd_p,
-	  RB_RESERVED_FD_P): added.  This C API is to limit to access
-	  fds which are used by RubyVM internal.  In this version of
-	  CRuby, return 1 if fd is communication pipe.
-	  If your application needs to close all file descriptors to
-	  present resource leak, skip internal fds using this C API.
-	  We also define a macro RB_RESERVED_FD_P(fd).  So you can write
-	    #ifndef RB_RESERVED_FD_P
-	    #define RB_RESERVED_FD_P(fd) 0
-	    #endif
-	  for Ruby 1.9.2 or previous version to write compatible extensions.
-	  See [ruby-core:37727]
-
-	* thread_win32.c (rb_reserved_fd_p): added (return 0 for any fds).
-
-	* io.c (rb_io_initialize): raise ArgumentError if given fd is reserved by Ruby.
-
-Sun Jul  3 23:43:56 2011  Yuki Sonoda (Yugui)  <yugui@yugui.jp>
-
-	* ext/extmk.rb (extmake): suppresses outputs from extconf.rb.
-	  (extmake) warns a failure in extconf.rb.
-
-Sun Jul  3 13:44:51 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* array.c (ary_reject_bang): should not remove elements which are
-	  not yielded.  [Bug #2545]
-
-Sun Jul  3 06:10:26 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* thread_pthread.c (get_stack): pthread_attr_getstack() doesn't
-	  return stack start address, but stack base address. Thus,
-	  we need to add stack size for getting stack start address.
-	  And, we don't have to decrease guard size twice.
-	* thread_pthread.c (thread_start_func_1): don't use inaccurate
-	  stack start guess if native_thread_init_stack() can be used.
-	  [Bug #1813] [ruby-core:24540]
-
-Sun Jul  3 04:50:08 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* thread_pthread.c (get_stack): add to a care of guard page on Mac
-	  OS X. [Bug #1813] [ruby-core:24540]
-	* signal.c (ruby_signal): SIGBUS use alternative stack too.
-	* signal.c (sigbus): On Mac, thread stack overflow makes SIGBUS
-	  instead of SIGSEGV. thus, added stackoverflow check.
-	* signal.c (default_handler): get rid of compilation warning.
-	* signal.c (Init_signal): ditto.
-
-Sat Jul 02 08:59:20 2011  Martin Bosslet  <Martin.Bosslet@googlemail.com>
-
-	* test/openssl/test_ocsp.rb
-	* test/openssl/test_x509_cert.rb: Perform SHA-256 tests only if
-	  supported by the available OpenSSL version. Versions < 0.9.8 don't
-	  support it. [ruby-core:37724]
-
-Sat Jul  2 07:17:45 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* array.c (rb_ary_reject_bang, rb_ary_delete_if): rejected
-	  elements should be removed.  fixed [Bug #2545]
-
-Sat Jul  2 01:57:00 2011  Kenta Murata  <mrkn@mrkn.jp>
-
-	* NEWS: remove a description of Kernel#respond_to? because it has
-	  been reverted at revision 28564.
-
-Sat Jul  2 00:58:00 2011  Kenta Murata  <mrkn@mrkn.jp>
-
-	* NEWS: describe a change of multiplication of Bignum.
-
-Fri Jul  1 18:52:31 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* benchmark/bm_app_erb.rb: increase loop count. too short
-	  measurement time makes less accuracy.
-	* benchmark/bm_app_factorial.rb: ditto.
-	* benchmark/bm_app_mandelbrot.rb: ditto.
-	* benchmark/bm_app_strconcat.rb: ditto.
-
-	* benchmark/bm_io_file_create.rb: ditto.
-	* benchmark/bm_io_file_read.rb: ditto.
-	* benchmark/bm_io_file_write.rb: ditto.
-
-	* benchmark/bm_so_concatenate.rb: ditto.
-	* benchmark/bm_so_lists.rb: ditto.
-	* benchmark/bm_so_matrix.rb: ditto.
-	* benchmark/bm_so_random.rb: ditto.
-	* benchmark/bm_so_sieve.rb: ditto.
-
-	* benchmark/bm_vm_thread_mutex1.rb: ditto.
-	* benchmark/bm_vm_thread_mutex2.rb: ditto.
-	* benchmark/bm_vm_thread_mutex3.rb: ditto.
-
-	* benchmark/bm_vm1_block.rb: cleanup.
-	* benchmark/bm_vm1_const.rb: cleanup.
-	* benchmark/bm_vm1_ensure.rb: cleanup.
-	* benchmark/bm_vm1_ivar.rb: cleanup.
-	* benchmark/bm_vm1_length.rb: cleanup.
-	* benchmark/bm_vm1_neq.rb: cleanup.
-	* benchmark/bm_vm1_not.rb: cleanup.
-	* benchmark/bm_vm1_rescue.rb: cleanup.
-	* benchmark/bm_vm1_simplereturn.rb: cleanup.
-	* benchmark/bm_vm1_swap.rb: cleanup.
-
-	* benchmark/bm_vm2_array.rb: cleanup.
-	* benchmark/bm_vm2_case.rb: cleanup.
-	* benchmark/bm_vm2_defined_method.rb: cleanup.
-	* benchmark/bm_vm2_eval.rb: cleanup.
-	* benchmark/bm_vm2_method.rb: cleanup.
-	* benchmark/bm_vm2_mutex.rb: cleanup.
-	* benchmark/bm_vm2_poly_method.rb: cleanup.
-	* benchmark/bm_vm2_poly_method_ov.rb: cleanup.
-	* benchmark/bm_vm2_proc.rb: cleanup.
-	* benchmark/bm_vm2_regexp.rb: cleanup.
-	* benchmark/bm_vm2_send.rb: cleanup.
-	* benchmark/bm_vm2_super.rb: cleanup.
-	* benchmark/bm_vm2_unif1.rb: cleanup.
-	* benchmark/bm_vm2_zsuper.rb: cleanup.
-
-	* benchmark/bm_vm_thread_alive_check1.rb: cleanup.
-
-Fri Jul  1 15:23:00 2011  Marc-Andre Lafortune  <ruby-core@marc-andre.ca>
-
-	* lib/matrix: Add LUP decomposition
-
-Fri Jul  1 15:21:14 2011  Marc-Andre Lafortune  <ruby-core@marc-andre.ca>
-
-	* lib/matrix.rb: Allow non integer exponents for Matrix#**
-
-Fri Jul  1 15:13:25 2011  Marc-Andre Lafortune  <ruby-core@marc-andre.ca>
-
-	* lib/matrix: Add Eigenvalue Decomposition
-
-Fri Jul  1 15:10:22 2011  Marc-Andre Lafortune  <ruby-core@marc-andre.ca>
-
-	* lib/matrix: Add Matrix#round
-
-Fri Jul  1 11:41:12 2011  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* string.c (tr_trans): free heap ptr when the str is not embedded.
-	  patched by Eric Wong. [Bug #4956] [ruby-core:37708]
-
-Fri Jul  1 11:07:43 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* thread.c (do_select): fix memory leak.
-	  Patch by Eric Wong. Thank you! [Bug #4953] [ruby-core:37702]
-
-Fri Jul  1 08:21:28 2011  Koichi Sasada  <ko1@atdot.net>
-
-	* vm_insnhelper.c (vm_getivar): check vm state version
-	  to invalidate inline cache (ivar index).
-	  fixes Bug #4926.
-
-	* vm_insnhelper.c (vm_setivar): ditto.
-
-Fri Jul  1 08:03:15 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* error.c, thread_pthread.c (WRITE_CONST): suppress warnings
-	  `ignoring return value'.
-
-Fri Jul  1 06:41:36 2011  Koichi Sasada  <ko1@atdot.net>
-
-	* thread.c (rb_threadptr_check_signal): only wake up main thread.
-
-	* thread.c (rb_threadptr_execute_interrupts_common): check signal
-	  delivery if it is main thread.
-	  fixes [ruby-dev:44005] [Ruby 1.9 - Bug #4950]
-
-	* bootstraptest/test_fork.rb: add a test for above.
-
-	* signal.c (rb_get_next_signal): skip if signal_buff is empty.
-	  (check signal_buff.size first)
-
-	* vm_core.h: remove unused variable rb_thread_t::exec_signal.
-
-	* thread.c (rb_thread_check_trap_pending): check
-	  rb_signal_buff_size() because rb_thread_t::exec_signal
-	  is no longer available.
-
-Fri Jul  1 03:28:25 2011  Yukihiro Matsumoto  <matz@ruby-lang.org>
-
-	* class.c (Init_class_hierarchy): should name BasicObject
-	  explicitly.
-
-	* variable.c (rb_const_defined_0): should not check for
-	  superclasses as const_get.
-
-Fri Jul  1 03:24:03 2011  Tadayoshi Funaba  <tadf@dotrb.org>
-
-	* ext/date/date_core.c: mathn is still alive (should die soon).
-
-Thu Jun 30 23:50:00 2011  Kenta Murata  <mrkn@mrkn.jp>
-
-	* misc/ruby-mode.el (ruby-indent-beg-re): Fix broken regular
-	  expression.  Fixes #4546
-
-Thu Jun 30 23:43:30 2011  Martin Bosslet  <Martin.Bosslet@googlemail.com>
-
-	* ext/openssl/ossl.c/.h: Added ossl_x509_name_sk2ary.
-	* ext/openssl/ossl.c: Replaced ossl_x509_ary2k by generic macro to
-	  simplify future conversions.
-	* ext/openssl/ossl_ssl.c: Implement SSLSocket#client_ca.
-	* test/openssl/test_ssl.rb: Add test for SSLSocket#client_ca.
-	  Thanks to Ippei Obayashi for providing the patch!
-	  [ Ruby 1.9 - Feature #4481 ] [ruby-core:35461]
-
-Thu Jun 30 22:38:58 2011  Koichi Sasada  <ko1@atdot.net>
-
-	* benchmark/bm_vm2_defined_method.rb: added to measure performance of
-	  bmethod (method defined by define_method()).
-
-Thu Jun 30 22:17:04 2011  Koichi Sasada  <ko1@atdot.net>
-
-	* vm_insnhelper.c (vm_call_bmethod): fix to hook call/return event
-	  for methods defined by define_method().  fixes Bug #4613.
-
-	* thread.c (call_trace_proc): Fix to skip if class is not given (0).
-	  Note that ID and Class object are passed for call/return event
-	  if the called method was defined by define_method().
-	  If you are author of tracer/profiler/debugger, this may be an
-	  important change.  You should check passed class as zero or
-	  non-zero instead of checking the event type.
-
-	* test/ruby/test_settracefunc.rb: add a test for above.
-
-Thu Jun 30 21:18:35 2011  Yutaka Kanemoto  <kanemoto@ruby-lang.org>
-
-	* configure.in: Add warnflags for XL/C on AIX during configure
-	  to avoid [Bug #3971]. See [ruby-core:32859]
-
-Thu Jun 30 21:16:04 2011  Tadayoshi Funaba  <tadf@dotrb.org>
-
-	* ext/date/date_core.c (m_ajd): refers a constant.
-
-Thu Jun 30 20:54:25 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	  * ext/io/console/io-console.gemspec: spin-off gem for 1.9.2.
-
-Thu Jun 30 20:36:23 2011  Tadayoshi Funaba  <tadf@dotrb.org>
-
-	* ext/date/date_core.c: trivial changes.
-
-Thu Jun 30 20:12:36 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* test/ruby/test_module.rb: tests for [Bug #3422] and [Bug #3423].
-
-Thu Jun 30 20:03:39 2011  Tadayoshi Funaba  <tadf@dotrb.org>
-
-	* ext/date/date_core.c: modified doc.
-
-Thu Jun 30 19:09:19 2011  Koichi Sasada  <ko1@atdot.net>
-
-	* thread_pthread.c (thread_timer): ignore unknown errno.
-	  (we observed that select(2) was canceled by errno=514 on
-	  boron == Linux/Xen environment)
-
-Thu Jun 30 17:33:25 2011  Koichi Sasada  <ko1@atdot.net>
-
-	* ext/objspace/objspace.c (ObjectSpace.count_tdata_objects):
-	  Fix rdoc.  Fixes Bug #3892.
-
-	* ext/objspace/objspace.c (ObjectSpace.count_tdata_objects):
-	  Change key type if the klass of a object is zero (internal object).
-	  Read rdoc for details.
-
-	* internal.h: export rb_objspace_data_type_name().
-
-Thu Jun 30 17:25:08 2011  Koichi Sasada  <ko1@atdot.net>
-
-	* thread_pthread.c (ping_signal_thread_list, thread_timer):
-	  fix to keep polling state if there are any ping-tasks.
-
-Thu Jun 30 12:25:34 2011  Koichi Sasada  <ko1@atdot.net>
-
-	* thread_pthread.c (rb_thread_create_timer_thread): allocate
-	  machine stack for the timer thread at least 12KB.  FreeBSD 8.2
-	  AMD64 causes machine stack overflow (SIGSEGV) only with
-	  PTHREAD_STACK_MIN (maybe defined as 2KB).
-
-Thu Jun 30 09:36:37 2011  Eric Hodel  <drbrain@segment7.net>
-
-	* lib/weakref.rb:  Attach documentation to WeakRef and add missing
-	  documentation
-
-Thu Jun 30 09:30:14 2011  Eric Hodel  <drbrain@segment7.net>
-
-	* lib/yaml.rb:  Document toplevel YAML and YAML::ENGINE to describe
-	  Psych vs Syck engines.
-
-Thu Jun 30 09:21:52 2011  Eric Hodel  <drbrain@segment7.net>
-
-	* lib/cmath.rb:  Hide handle_no_method_error from RDoc.
-	* error.c:  Document or hide undocumented error classes.
-
-Thu Jun 30 07:49:04 2011  Eric Hodel  <drbrain@segment7.net>
-
-	* hash.c:  Document ENV
-
-Thu Jun 30 06:37:43 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* ruby.c (ruby_init_loadpath_safe): ensure RUBYLIB_PREFIX stored
-	  before RUBYLIB, even if MANGLED_PATH is enabled.  fixed #1679.
-	  MANGLED_PATH is disabled by the default and will be removed
-	  completely in the future.
-
-Thu Jun 30 06:32:21 2011  Eric Hodel  <drbrain@segment7.net>
-
-	* lib/drb/drb.rb:  Hide deprecated toplevel DRb constants.
-
-Thu Jun 30 06:17:02 2011  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* lib/cmath.rb (CMath.log): second argument: b can be nil.
-
-Thu Jun 30 06:23:28 2011  Eric Hodel  <drbrain@segment7.net>
-
-	* thread.c (ruby_thread_s_pass):  Fix typo.
-
-Thu Jun 30 06:16:53 2011  Eric Hodel  <drbrain@segment7.net>
-
-	* lib/rdoc:  Update to RDoc 3.8 which contains fixes for documentation
-	  in trunk.
-
-Thu Jun 30 02:53:26 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* thread.c (rb_threadptr_execute_interrupts_common): remove
-	  meaningless native_thread_yield(). It never close a race.
-
-Thu Jun 30 02:41:47 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* thread.c (rb_thread_schedule_limits): minor optimization.
-	  eliminate machine context saving when running time is enough small.
-
-Thu Jun 30 02:28:11 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* thread.c (rb_thread_schedule_rec): move interrupt_flag check to
-	  rb_thread_schedule().
-	  And also rename to rb_thread_schedule_limits() and remove
-	  sched_depth argument. It's no longer called recursive.
-	* thread.c (rb_thread_schedule): add to check interrupt_flag as
-	  above explained.
-
-	* thread.c (rb_threadptr_execute_interrupts_rec): rename to
-	  rb_threadptr_execute_interrupts_common() and remove sched_depth
-	  argument. It's no longer called recursive.
-
-	* thread.c (rb_thread_sleep): adapt the renaming.
-	* thread.c (rb_threadptr_execute_interrupts): ditto.
-	* thread.c (rb_thread_execute_interrupts): ditto.
-
-Thu Jun 30 01:31:33 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* thread.c (thread_s_pass): change RDoc description and remove
-	  a sample code. The actual implementation never behave as explained by
-	  an example. It's a documentation bug.
-
-Thu Jun 30 00:54:33 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* thread.c (rb_thread_stop): change RDoc sample code. The old
-	  example is buggy and may cause deadlock. The patch is
-	  suggested by Heesob Park <phasis@gmail.com>. Thank you!
-	  [Bug #3606][ruby-core:31454]
-
-Thu Jun 30 00:49:53 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* thread.c (rb_thread_wakeup): change RDoc sample code. The old
-	  example is buggy and may not display anything by a race.
-	  The patch is suggested by Heesob Park <phasis@gmail.com>.
-	  Thank you! [Bug #3606][ruby-core:31454]
-
-Thu Jun 30 00:43:33 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* thread.c (rb_thread_run): change RDoc. The old example is buggy
-	  and may cause deadlock. The patch is suggested by Heesob Park
-	  <phasis@gmail.com>. Thank you! [Bug #3606][ruby-core:31454]
-
-Thu Jun 30 00:30:15 2011  Keiju Ishitsuka  <keiju@ishitsuka.com>
-
-	* lib/cmath.rb: make same exception for Math. fix [Bug #3137].
-
-Thu Jun 30 00:03:20 2011  Keiju Ishitsuka  <keiju@ishitsuka.com>
-
-	* lib/irb/completion.rb: complement correctly string literal. fix
-	  [Bug #1145].
-
-Wed Jun 29 23:42:51 2011  Tadayoshi Funaba  <tadf@dotrb.org>
-
-	* ext/date/date_core.c: avoided using timev.
-	* ext/date/date_strftime.c: ditto.
-	* ext/date/date_tmx.h: ditto.
-
-Wed Jun 29 23:17:57 2011  WATANABE Hirofumi  <eban@ruby-lang.org>
-
-	* ext/openssl/ossl.h (OPENSSL_SYS_WIN32): support for mingw(msys).
-
-Wed Jun 29 23:09:14 2011  WATANABE Hirofumi  <eban@ruby-lang.org>
-
-	* ext/tk/extconf.rb (intptr_t, uintptr_t): support for the latest ActiveTcl with mingw.
-
-Wed Jun 29 22:49:10 2011  Keiju Ishitsuka  <keiju@ishitsuka.com>
-
-	* lib/irb/cmd/help.rb: support RDoc 3.7. fix [Bug #3760].
-
-Wed Jun 29 22:04:14 2011  CHIKANAGA Tomoyuki  <nagachika00@gmail.com>
-
-	* lib/tracer.rb: Tracer.on only if required by -r command-line option.
-	  and consider --disable-gems option.
-	* test/test_tracer.rb: add tests for it.
-
-Wed Jun 29 13:55:36 2011  Yukihiro Matsumoto  <matz@ruby-lang.org>
-
-	* variable.c (rb_const_get_0): should not look for superclasses if
-	  the second optional argument is given for #const_get().
-	  fix [Bug #3422] [Bug #3423]
-
-Wed Jun 29 12:07:27 2011  Eric Hodel  <drbrain@segment7.net>
-
-	* math.c:  Attach documentation for Math.
-	* object.c:  Document NIL, TRUE, FALSE.
-	* io.c:  Improve grammar in ARGF comment.  Document STDIN/OUT/ERR.
-	  Document ARGF global constant.
-	* lib/rake:  Hide deprecated toplevel constants from RDoc (import from
-	  rake trunk).
-	* lib/thwait.rb:  Document ThWait.
-	* lib/mathn.rb:  Hide Math redefinition from RDoc
-	* lib/sync.rb:  Add a basic comment for Sync_m, Synchronizer_m, Sync,
-	  Synchronizer.
-	* parse.y:  Document SCRIPT_LINES__.
-	* hash.c:  Document ENV class and global constant.
-	* vm.c:  Document TOPLEVEL_BINDING.
-	* version.c:  Document RUBY_* constants.
-	* ruby.c:  Document DATA and ARGV.
-
-Wed Jun 29 10:13:12 2011  Marc-Andre Lafortune  <ruby-core@marc-andre.ca>
-
-	* lib/matrix.rb: Matrix.zero can build rectangular matrices.
-	  Vector#r should be called #magnitude
-
-Wed Jun 29 10:11:08 2011  Marc-Andre Lafortune  <ruby-core@marc-andre.ca>
-
-	* lib/matrix.rb: Add Matrix#diagonal?, hermitian?, normal?,
-	  orthogonal?
-	  permutation?, symmetric?, {lower|upper}triangular?, unitary?, zero?
-
-Wed Jun 29 10:09:35 2011  Marc-Andre Lafortune  <ruby-core@marc-andre.ca>
-
-	* lib/matrix.rb: Specialize Matrix#find_index to return [row, col]
-	  and accept the same optional argument as #each
-
-Wed Jun 29 10:07:32 2011  Marc-Andre Lafortune  <ruby-core@marc-andre.ca>
-
-	* lib/matrix.rb: Matrix#each{_with_index} can iterate over a subset
-	  of the Matrix
-
-Wed Jun 29 06:21:02 2011  Koichi Sasada  <ko1@atdot.net>
-
-	* thread_pthread.c (native_stop_timer_thread): skip to close
-	  communication pipe to avoid timing bug (process termination timing).
-	  The communication pipe will closed by OS.
-
-Wed Jun 29 06:09:54 2011  Koichi Sasada  <ko1@atdot.net>
-
-	* error.c (rb_async_bug_errno): async-safe bug report function.
-	  In timer thread, signal handler should use it.
-	  The patch is contributed by Eric Wong <normalperson@yhbt.net>.
-	  Refs: [ruby-core:37644] and [ruby-core:37647]
-
-	* thread_pthread.c: use rb_async_bug_errno().
-	  And replace all fprintf() to write().
-
-	* internal.h (rb_async_bug_errno): add decl. of above func.
-
-Tue Jun 28 23:46:08 2011  Keiju Ishitsuka  <keiju@ishitsuka.com>
-
-	* lib/tracer.rb: count only non-internal libraries in stack trace,
-	  ignoring custom_require.
-
-Tue Jun 28 21:44:58 2011  Keiju Ishitsuka  <keiju@ishitsuka.com>
-
-	* lib/irb/ruby-lex.rb: recognize '\char' in ruby statement.
-
-Tue Jun 28 20:39:29 2011  Hiroshi Nakamura  <nahi@ruby-lang.org>
-
-	* lib/debug.rb (var_list): Command 'var *' did not work on 1.9(!).
-	  global_variables, local_variables, and instance_variables returns
-	  Symbols from 1.9 and need to stringify before evaling it.
-	  See #4931.
-
-Tue Jun 28 19:23:01 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* signal.c: Now, USE_TRAP_SIGMASK depend on HAVE_PTHREAD_SIGMASK.
-	  The code have already depended on pthread_sigmask since r27464.
-
-Tue Jun 28 15:09:21 2011  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* lib/benchmark.rb: merge eregon/benchmark.
-	  https://github.com/eregon/ruby/tree/benchmark
-	  patched by Benoit Daloze. [ruby-core:37593] [Bug #4940]
-
-	* lib/benchmark (Benchmark#bmbm): bmbm should be consistent with bm
-	  for the return value.
-
-	* test/benchmark: remove preemptive test instead of skipping
-	  I removed the preemptive test I wrote for Feature #4197.
-	  I'll add it back when the implementation will be able to satisfy it.
-
-	* lib/benchmark (Benchmark#bmbm): remove useless explicit call,
-	  #format is an alias of #to_s test/benchmark: add a test for
-	  format of long time.
-
-	* lib/benchmark: fix label width: always add 1 to ensure there is a
-	  space delimiter even with times over 100s
-	  When I asked for Feature #4197, I wanted to make delimiting spaces
-	  consistent for #bm and #bmbm.
-	  But with times over 100s, the output contains no space between the
-	  label and the first time (user).
-	  Now both ensure there is always a space, even if that means 3 spaces
-	  with times under 10s (because it is formatted as %10.6f)
-
-	* test/benchmark: let labels be a constant
-	  lib/benchmark (Benchmark#realtime): avoid creating an unused Proc
-	  lib/benchmark (Benchmark#benchmark): use ensure clause to restore
-	  STDOUT.sync, as in #bmbm
-
-Tue Jun 28 13:41:51 2011  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* thread_win32.c (native_stop_timer_thread): fixed commit miss of
-	  r32244.  grep sources before changing the signature of a function.
-
-Tue Jun 28 11:49:14 2011  Koichi Sasada  <ko1@atdot.net>
-
-	* thread_pthread.c (consume_communication_pipe):
-	  Make "buff" as static.  (Maybe) "buff" can be shared between
-	  any caller (any threads) because no one use the read values.
-	  "buff" (1024 byte) on stack may cause stack overflow on
-	  several environment (we found a crash on FreeBSD).
-	  And remove const value "buff_size", and define CCP_READ_BUFF_SIZE
-	  macro.
-
-Tue Jun 28 11:45:30 2011  Eric Hodel  <drbrain@segment7.net>
-
-	* lib/rake:  Update rake to fix some bugs and hide deprecated features
-	  from RDoc.
-	* lib/rake/version.rb:  Bump version to 0.9.2.1 to distinguish it from
-	  the released version.
-	* NEWS:  ditto
-
-Tue Jun 28 11:17:28 2011  Eric Hodel  <drbrain@segment7.net>
-
-	* lib/rdoc:  Update to RDoc 3.7 (final)
-	* NEWS:  ditto
-
-Tue Jun 28 10:18:42 2011  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* process.c (rb_daemon): fix wrong #endif position.
-
-Tue Jun 28 07:50:32 2011  Eric Hodel  <drbrain@segment7.net>
-
-	* object.c (Init_Object):  Teach RDoc what Init_class_hierarchy does to
-	  hook up ri for BasicObject, Object, Module and Class.
-
-Tue Jun 28 05:03:32 2011  Hiroshi Nakamura  <nahi@ruby-lang.org>
-
-	* thread.c (rb_thread_local_aref): RDoc fix. Thread#[] example
-	  had a race. See #4480.
-
-Tue Jun 28 01:22:00 2011  Kenta Murata  <mrkn@mrkn.jp>
-
-	* ext/bigdecimal/bigdecimal.c (BigMath_s_log): move BigMath.log from
-	  bigdecimal/math.rb.
-
-	* ext/bigdecimal/lib/bigdecimal/math.rb: ditto.
-
-	* test/bigdecimal/test_bigdecimal.rb: move test for BigMath.log from
-	  test/bigdecimal/test_bigmath.rb.
-
-	* test/bigdecimal/test_bigmath.rb: ditto.
-
-Tue Jun 28 01:19:52 2011  Keiju Ishitsuka  <keiju@ishitsuka.com>
-
-	* lib/irb/ruby-lex.rb: fix [Bug #4232].
-
-Tue Jun 28 00:14:13 2011  Masatoshi SEKI  <m_seki@mva.biglobe.ne.jp>
-
-	* lib/drb/drb.rb: fix [Bug #4409]. add DRbServer#here?.
-
-	* test/drb/test_drb.rb: ditto.
-
-	* test/drb/drbtest.rb: ditto.
-
-	* test/drb/ut_eq.rb: ditto.
-
-Tue Jun 28 00:08:43 2011  Keiju Ishitsuka  <keiju@ishitsuka.com>
-
-	* lib/irb/workspace.rb: fix BUG#4793.
-
-Mon Jun 27 22:06:12 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* thread_pthread.c (consume_communication_pipe): don't use C99
-	  style variable length array.
-
-Mon Jun 27 22:04:27 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* thread_pthread.c (consume_communication_pipe): change return
-	  type to void. caller doesn't use it.
-
-Mon Jun 27 21:29:50 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* thread_pthread.h (rb_global_vm_lock_struct): add volatile to
-	  gvl->waiting. now thread_timer() access it w/o lock.
-
-Mon Jun 27 21:16:11 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* thread_pthread.c: s/__gvl_acquire/gvl_acquire_common/ and
-	  s/__gvl_release/gvl_release_common/.
-
-Mon Jun 27 11:41:47 2011  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* thread_pthread.c (rb_thread_create_timer_thread):
-	  the type of return value of write(2) is ssize_t.
-
-Mon Jun 27 09:57:02 2011  Koichi Sasada  <ko1@atdot.net>
-
-	* thread_pthread.c (rb_thread_create_timer_thread):
-	  Fixes missing initialization of oflags.
-
-Mon Jun 27 09:07:42 2011  Koichi Sasada  <ko1@atdot.net>
-
-	* thread_pthread.c: Stop polling in the timer thread when there are
-	  no waiting thread.  If there are 2 or more runnable threads,
-	  the timer thread does polling.  Avoid polling makes power save
-	  for several computers (0.2W per a Ruby process, when I measured).
-	  If outside-event such as signal or Thread#kill was occurred
-	  when the timer thread does not do polling, then wake-up
-	  the timer thread using communication-pipe (the timer thread
-	  waits this communication-pipe with select(2)).
-	  The discussion about this modification can be found from the post
-	  [ruby-core:33456] and other related posts.
-	  Note that Eric Wong and KOSAKI Motohiro give us the huge
-	  contributions for this modification.  Thanks.
-
-	* thread_pthread.c (rb_thread_wakeup_timer_thread): add a function.
-	  This function wakes up the timer thread using communication-pipe.
-
-	* thread.c (rb_thread_stop_timer_thread): add a parameter which
-	  specify closing communication-pipe or not.
-
-	* thread.c (rb_thread_terminate_all): do not stop timer thread here
-	  (ruby_cleanup() terminate timer thread).
-
-	* signal.c: wake up timer thread using
-	  rb_thread_wakeup_timer_thread() from signal handler.
-
-	* eval.c (ruby_cleanup): use rb_thread_stop_timer_thread(1).
-
-	* process.c: use rb_thread_stop_timer_thread(0)
-	  (reuse communication-pipe).
-
-	* thread_win32.c (rb_thread_wakeup_timer_thread): add a dummy
-	  function.
-
-	* vm_core.h: add and fix decl. of functions.
-
-Mon Jun 27 08:01:19 2011  Tadayoshi Funaba  <tadf@dotrb.org>
-
-	* ext/date/date_parse.c: should use ALLOCA_N.
-
-Mon Jun 27 01:34:18 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* test/etc/test_etc.rb (TestEtc#test_get{pw,gr}nam): skip entries
-	  start with + sign, which means NIS.  these are returned in the
-	  case that passwd and group entries in /etc/nsswitch.conf are set
-	  to use "nis" explicitly on Debian.  fixed #3683
-
-Mon Jun 27 00:44:53 2011  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* parse.y (rb_parser_end_seen_p): fix documentation about return
-	  value. patched by Sho Hashimoto. [Bug #4511]
-
-Mon Jun 27 00:40:47 2011  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* hash.c (rb_hash_reject): add documentation that Hash#reject
-	  without block returns enumerator.
-	  patched by Michael Edgar [Bug #4847] [ruby-core:36800]
-
-Sun Jun 26 23:49:21 2011  Tadayoshi Funaba  <tadf@dotrb.org>
-
-	* test/date/test_switch_hitter.rb: added a test.
-
- Sun Jun 26 22:21:23 2011  Tadayoshi Funaba  <tadf@dotrb.org>
-
-	* ext/date/date_core.c: refactoring.
-
-Sun Jun 26 18:03:30 2011  URABE Shyouhei  <shyouhei@ruby-lang.org>
-
-	* parse.y: comma at the end of line is no longer allowed.
-	  A patch from Yukihiro Matsumoto  <matz AT ruby-lang.org>.
-	  (fixed #3456).
-
-Sun Jun 26 13:35:35 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* vm_dump.c (rb_vm_bugreport): change CrashReporter suggestion messages
-	  on Mac. It should be placed after "-- C level backtrace" line.
-	  Suggested by Endoh-san.
-
-	  <before>
-	  -- See Crash Report log file under ~/Library/Logs/CrashReporter or ---------
-	  -- /Library/Logs/CrashReporter, for the more detail of ---------------------
-	  -- C level backtrace information -------------------------------------------
-
-	<after>
-	  -- C level backtrace information -------------------------------------------
-
-	     See Crash Report log file under ~/Library/Logs/CrashReporter or
-	     /Library/Logs/CrashReporter, for the more detail of.
-
-Sun Jun 26 10:08:28 2011  Martin Bosslet  <Martin.Bosslet@googlemail.com>
-
-	* ext/openssl/extconf.rb
-	* ext/openssl/ossl_missing.h/.c: add ASN1_put_eoc if missing.
-
-	* ext/openssl/ossl_asn1.c: introduce ossl_asn1_object_size and
-	  ossl_asn1_put_object to wrap functionality depending on OpenSSL
-	  version in use.
-	  Fixes	[ Ruby 1.9 - Bug #4916 ] reported by Hiroshi Nakamura.
-	  [ruby-core:37286]
-
-Sun Jun 26 01:00:15 2011  Tadayoshi Funaba  <tadf@dotrb.org>
-
-	* ext/date/date_core.c (date_strftime_internal): removed meaningless braces.
-	* ext/date/date_core.c (gengo): the value should be int.
-
-Sat Jun 25 23:45:30 2011  CHIKANAGA Tomoyuki  <nagachika00@gmail.com>
-
-	* vm_insnhelper.c (vm_search_superclass): avoid control frame
-	  stack overrun. currently super() in Proc created in a method
-	  defined by Module#define_method raise NoMethodError. [Bug #4881]
-	* test/ruby/test_method.rb t_super_in_proc_from_define_method):
-	  add test for it.
-
-Sat Jun 25 23:23:14 2011  CHIKANAGA Tomoyuki  <nagachika00@gmail.com>
-
-	* thread.c (sleep_forever): now Kernel#sleep don't wakeup by
-	  signal handler execution. [Bug #4072]
-
-Sat Jun 25 23:14:47 2011  CHIKANAGA Tomoyuki  <nagachika00@gmail.com>
-
-	* thread.c (rb_threadptr_check_signal): remove unnecessary th->status
-	  backup. fix race condition which may results unexpected main thread's
-	  status transition. see #4072
-
-Fri Jun 24 19:57:30 2011  Hiroshi Nakamura  <nahi@ruby-lang.org>
-
-	* lib/webrick/httprequest.rb (setup_forwarded_info): Parsing request
-	  header failed when the request is from 2 or more Apache reverse
-	  proxies. It's said that all X-Forwarded-* headers will contain more
-	  than one (comma-separated) value if the original request already
-	  contained one of these headers.  Since we could use these values as
-	  Host header, we choose the initial(first) value. See #4922.
-
-	* test/webrick/test_httprequest.rb (test_forwarded): Test it.
-
-Fri Jun 24 17:06:33 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* process.c (proc_daemon): should not start timer thread
-	  twice.  fixed Bug#4920.
-
-Fri Jun 24 15:54:14 2011  Hiroshi Nakamura  <nahi@ruby-lang.org>
-
-	* ext/openssl/ossl_ssl.c (ossl_ssl_shutdown): Try to shutdown SSL
-	  connection more gracefully. Call SSL_shutdown() max 4 times until it
-	  returns 1 (success). Bi-directional SSL close has several states but
-	  SSL_shutdown() kicks only 1 transition per call. Max 4 is from
-	  mod_ssl.c of Apache httpd that says 'max 2x pending + 2x data = 4'.
-	  See #4237.
-
-Fri Jun 24 07:24:37 2011  Eric Hodel  <drbrain@segment7.net>
-
-	* lib/rake/version.rb:  Fixed VERSION to work with tool/rbinstall.rb
-	* bin/rake:  Import bin/rake from 0.9.2
-	* tool/rbinstall.rb (install):  Rake::VERSION is now in
-	  lib/rake/version.rb.  Fixes `make install`
-
-Fri Jun 24 07:11:37 2011  Eric Hodel  <drbrain@segment7.net>
-
-	* lib/rake: Import Rake 0.9.2
-
-Fri Jun 24 00:44:15 2011  Tadayoshi Funaba  <tadf@dotrb.org>
-
-	* ext/date/date_core.c (c_valid_{julian,gregorian}_p): fixed the range of month.
-
-Fri Jun 24 00:14:23 2011  Tadayoshi Funaba  <tadf@dotrb.org>
-
-	* ext/date/date_core.c: trivial changes on text.
-
-Thu Jun 23 22:46:57 2011  Hiroshi Nakamura  <nahi@ruby-lang.org>
-
-	* ext/openssl/ossl_x509name.c: Add X509::Name#hash_old as a wrapper
-	  for X509_NAME_hash_old in OpenSSL 1.0.0. See #4805
-
-	* test/openssl/test_x509name.rb (test_hash): Make test pass with
-	  OpenSSL 1.0.0.
-
-	* NEWS: Add it.
-
-Thu Jun 23 19:30:53 2011  Hiroshi Nakamura  <nahi@ruby-lang.org>
-
-	* ext/openssl/ossl_ssl_session.c (ossl_ssl_session_set_time): Check
-	  argument type with NUM2LONG if the arg is not a Time object.
-	  See #4919.
-
-	* ext/openssl/ossl_ssl_session.c (ossl_ssl_session_set_timeout): Check
-	  type with NUM2LONG. Time as an arg is not allowed. See #4919.
-
-	* test/openssl/test_ssl_session.rb (test_session_time,
-	  test_session_timeout): Test it.
-
-Wed Jun 23 13:30:30 2011  Shota Fukumori  <sorah@tubusu.net>
-
-	* signal.c(ruby_atomic_exchange): Fix definition style.
-
-Wed Jun 22 22:34:05 2011  Hiroshi Nakamura  <nahi@ruby-lang.org>
-
-	* ext/openssl/ossl_ssl.c (ossl_sslctx_session_new_cb): Return 0 to
-	  OpenSSL from the callback for SSL_CTX_sess_set_get_cb().
-	  Returning 0 means to OpenSSL that the session is still valid
-	  (since we created Ruby Session object) and was not freed by us with
-	  SSL_SESSION_free(). Call SSLContext#remove_session(sess) in
-	  session_get_cb block if you don't want OpenSSL to cache the session
-	  internally.
-	  This potential issue was pointed by Ippei Obayashi. See #4416.
-
-	* test/openssl/test_ssl_session.rb (test_ctx_server_session_cb): Test
-	  it.
-
-Wed Jun 22 22:21:17 2011  Martin Bosslet  <Martin.Bosslet@googlemail.com>
-
-	* ext/openssl/ossl_ssl_session.c: Respect T_BIGNUM time values. Patch by
-	  Tomoyuki Chikanaga.
-	  [ Ruby 1.9 - Bug #4919 ] [ruby-dev:43869]
-
-Wed Jun 22 21:29:25 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* ext/socket/depend (SOCK_HEADERS): use $(top_srcdir) instead of
-	  $(topdir). sorry!
-
-Wed Jun 22 19:47:03 2011  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* cont.c (cont_capture): add volatile.
-	  On clang -O, it is needed to avoid the optimization.
-	  With this and llvm/clang's recent fix, clang 3.0 can
-	  build ruby-trunk with -O option.
-
-	* cont.c (cont_capture): use for-loop.
-
-	* array.c (rb_ary_each): add volatile and use it.
-
-	* vm_insnhelper.c (vm_call_cfunc): ditto.
-
-Wed Jun 22 18:20:46 2011  Hiroshi Nakamura  <nahi@ruby-lang.org>
-
-	* ext/openssl/ossl_ssl.c (ossl_sslctx_session_remove_cb):
-	  OpenSSL::SSL::SSLContext#session_remove_cb was broken. It wrongly
-	  tried to call the session_*new*_cb callback.
-
-	* test/openssl/test_ssl_session.rb (class OpenSSL): Test it.
-
-Wed Jun 22 17:37:49 2011  Martin Bosslet  <Martin.Bosslet@googlemail.com>
-
-	* ext/openssl/ossl.h: Introduced OSSL_BIO_reset macro for PEM/DER
-	  fallback scenarios.
-
-	* ext/openssl/ossl_pkey_dsa.c
-	* ext/openssl/ossl_x509req.c
-	* ext/openssl/ossl_pkey_rsa.c
-	* ext/openssl/ossl_pkey_ec.c
-	* ext/openssl/ossl_ssl_session.c
-	* ext/openssl/ossl_x509crl.c
-	* ext/openssl/ossl_pkey.c
-	* ext/openssl/ossl_pkey_dh.c
-	* ext/openssl/ossl_x509cert.c
-	* ext/openssl/ossl_pkcs7.c: Use OSSL_BIO_reset.
-
-	* ext/openssl/ossl_ssl.c
-	* ext/openssl/ossl_cipher.c
-	* ext/openssl/ossl_pkey_ec.c
-	* ext/openssl/ossl_pkcs12.c
-	* ext/openssl/ossl_ssl_session.c: Replace rb_raise occurrences by
-	  ossl_raise. This automatically flushes OpenSSL's error queue.
-
-	* ext/openssl/ossl_pkcs7.c: Raise error if DER fallback for parsing
-	  fails.
-
-	* test/openssl/test_pkey_ec.rb
-	* test/openssl/test_pkey_dsa.rb
-	* test/openssl/test_pkey_rsa.rb: Add assertions that OpenSSL.errors is
-	  empty.
-
-	* test/openssl/test_pkey_rsa.rb: Remove initial OpenSSL.errors call in
-	  test_new.
-	  [ Ruby 1.9 - Bug #4885 ] [ruby-core:37134]
-
-Wed Jun 22 15:01:24 2011  Martin Bosslet  <Martin.Bosslet@googlemail.com>
-
-	* ext/openssl/ossl_ssl.c: Use SSL_MODE_RELEASE_BUFFERS if available.
-	  Thanks, Eric Wong, for providing the patch.
-	  [ Ruby 1.9 - Feature #4672 ] [ruby-core:36127]
-
-Wed Jun 22 14:47:53 2011  Martin Bosslet  <Martin.Bosslet@googlemail.com>
-
-	* test/openssl/test_buffering.rb
-	* test/openssl/test_pkcs12.rb: Inherit from Test::Unit::TestCase
-	  instead of MiniTest::Unit::TestCase. [ruby-core:37275]
-
-Wed Jun 22 12:41:03 2011  Hiroshi Nakamura  <nahi@ruby-lang.org>
-
-	* ext/openssl/ossl_ssl_session.c (ossl_ssl_session_to_der):
-	  OpenSSL::SSL::Session#to_der was broken. Fix buffer handling.
-
-	* test/openssl/test_ssl_session.rb (test_session): Test it.
-
-Wed Jun 22 12:38:52 2011  Hiroshi Nakamura  <nahi@ruby-lang.org>
-
-	* test/openssl/test_ssl_session.rb: Split out SSL::Session related
-	  tests from test_ssl.rb
-
-Wed Jun 22 03:20:52 2011  Aaron Patterson <aaron@tenderlovemaking.com>
-
-	* ext/psych/lib/psych/visitors/to_ruby.rb: Fix cyclic references of
-	  objects.  Thanks to CvX for reporting the bug and a test case.
-	* test/psych/test_object.rb: test for cyclic object references.
-
-Wed Jun 22 02:39:54 2011  Hiroshi Nakamura  <nahi@ruby-lang.org>
-
-	* lib/net/http.rb (Net::HTTP.post_form): Do not ignore query part of
-	  the given URI to post. See #655.
-
-	* test/net/http/test_http.rb, test/net/http/utils.rb: Test it.
-
-Wed Jun 22 01:28:13 2011  Hiroshi Nakamura  <nahi@ruby-lang.org>
-
-	* test/openssl/test_x509store.rb (test_set_errors): Redhat is
-	  distributing a patched version of OpenSSL that allows multiple CRL
-	  for a key (multi-crl.patch.) Make test pass on such env. See #4122,
-	  #4554.
-
-Tue Jun 21 21:50:37 2011  Hiroshi Nakamura  <nahi@ruby-lang.org>
-
-	* lib/webrick/httpresponse.rb (HTTPResponse#setup_header): Close
-	  HTTP/1.1 connection when returning an IO object as response body
-	  without setting HTTPResponse#chunked to true. See #855 no.1.
-
-	* test/webrick/test_httpserver.rb: Test it.
-
-Tue Jun 21 21:27:34 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* internal.h: move rb_thread_io_blocking_region() declaration
-	  from intern.h to internal.h. It's still experimental API and
-	  need more discussion. [ruby-dev:43698]
-	* include/ruby/intern.h: ditto.
-
-	* ext/socket/rubysocket.h: include internal.h.
-	* ext/socket/depend: add internal.h dependency.
-	* ext/socket/extconf.rb: add $INCFLAGS to topdir.
-
-Tue Jun 21 20:38:47 2011  Tadayoshi Funaba  <tadf@dotrb.org>
-
-	* ext/date/date_core.c (datetime_s_*): canonicalize 24 o'clock.
-
-Tue Jun 21 19:46:23 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* test/ruby/test_thread.rb (TestThread#test_priority): enable
-	  this test again. Current GVL respect thread priority rather
-	  than past.
-
-Tue Jun 21 13:25:35 2011  TAKAO Kouji  <kouji@takao7.net>
-
-	* ext/readline/readline.c (readline_getc): applied a patch in
-	  #3827 by by Akio Tajima <artonx AT yahoo.co.jp>. (see #3827)
-
-Tue Jun 21 13:16:31 2011  TAKAO Kouji  <kouji@takao7.net>
-
-	* ext/readline/extconf.rb: fixed bug, specify --disable-libedit
-	  then disable libedit, does not specify then check readline and
-	  libedit if failed checking readline. (fixes #3375)
-
-Mon Jun 20 22:52:07 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* process.c (before_exec): use sig_do_nothing instead of SIG_DFL
-	  for avoiding a race.
-	* process.c (sig_do_nothing): new function.
-
-Mon Jun 20 21:31:03 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* thread_pthread.c (thread_timer): rename timeout_10ms to
-	  time_quantum. it's no longer 10ms.
-
-Mon Jun 20 18:46:02 2011  Hiroshi Nakamura  <nahi@ruby-lang.org>
-
-	* ext/openssl/ossl_cipher.c, ext/openssl/lib/openssl/cipher.rb:
-	  Documentation fix by Ippei Obayashi. See #4419.
-
-Mon Jun 20 15:41:33 2011  Hiroshi Nakamura  <nahi@ruby-lang.org>
-
-	* lib/webrick/cookie.rb (WEBrick::Cookie.parse): Revert r31228.
-	  r31228 was for allowing the 'Cookie:' header which did not have no
-	  SP after ';' for separating cookie-pairs but RFC6265 requires single
-	  SP after ';' there.  We allow multiple SPs here for compatibility
-	  with older WEBrick version.
-
-	* test/webrick/test_cookie.rb: Test it.
-
-Sun Jun 19 13:31:26 2011  Shota Fukumori  <sorah@tubusu.net>
-
-	* NEWS: Introduce --hide-skip on test/unit.
-
-Sun Jun 19 10:05:16 2011  Shota Fukumori  <sorah@tubusu.net>
-
-	* lib/test/unit/parallel.rb: Override Test::Unit::TestCase#on_parallel_worker?
-	  only when $0 == __FILE__.
-
-	* lib/test/unit/parallel.rb: Run Test::Unit::Worker.run only when
-	  $0 == __FILE__.
-
-Sat Jun 18 23:59:24 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* io.c (fill_cbuf): finish reading at EOF, and the readconv has
-	  been cleared by another thread while io_fillbuf() is waiting at
-	  select().  a patch in [ruby-core:37197] by Hiroshi Shirosaki
-	  <h.shirosaki AT gmail.com>.  fixed #3840
-
-Sat Jun 18 21:36:29 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* thread_pthread.c: remove GVL_DEBUG
-
-Sat Jun 18 21:32:02 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* vm.c, vm_core.h (rb_vm_stack_to_heap): remove const.
-	  It makes compilations warnings.
-
-Sat Jun 18 18:54:15 2011  Koichi Sasada  <ko1@atdot.net>
-
-	* vm.c, vm_core.h (rb_vm_stack_to_heap): fix "const" place.
-
-Sat Jun 18 17:23:38 2011  Tanaka Akira  <akr@fsij.org>
-
-	* eval.c, hash.c, load.c, proc.c, range.c, thread.c, time.c: don't
-	  declare internal functions.
-
-	* internal.h, vm_core.h: declare internal functions.
-
-	* array.c: include internal.h.
-
-	* common.mk: update dependency for array.o.
-
-Sat Jun 18 13:39:33 2011  Tanaka Akira  <akr@fsij.org>
-
-	* internal.h: declarations declared in include/ruby/*.h removed.
-
-Sat Jun 18 12:42:17 2011  Tanaka Akira  <akr@fsij.org>
-
-	* method.h, internal.h iseq.h: declare internal functions.
-
-	* compile.c, eval.c, iseq.c, object.c, parse.y, proc.c, process.c,
-	  thread.c, vm.c, vm_eval.c, vm_insnhelper.c, vm_method.c: don't
-	  declare internal functions.
-
-	  Note that rb_method_entry_eq() is defined in vm_method.c but
-	  there was a declaration in proc.c with different const-ness.
-	  Now it is declared in method.h with same const-ness to the
-	  definition.
-
-	* object.c (rb_mod_module_exec): don't declare functions declared in
-	  include/ruby/intern.h.
-
-Sat Jun 18 12:05:08 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* include/ruby/backward/classext.h: for evil gems.  fixed #4803
-
-Sat Jun 18 11:12:13 2011  Tanaka Akira  <akr@fsij.org>
-
-	* common.mk: update dependencies.
-
-Sat Jun 18 11:09:03 2011  Tanaka Akira  <akr@fsij.org>
-
-	* io.c: suppress warnings.
-
-Sat Jun 18 10:22:39 2011  Tanaka Akira  <akr@fsij.org>
-
-	* internal.h: declare more internal functions.
-
-	* iseq.h (rb_method_get_iseq): declared.
-
-	* compile.c, eval.c, eval_error.c, iseq.c, parse.y, proc.c, range.c,
-	  ruby.c, time.c, util.c, vm.c: don't declare internal functions.
-
-	* eval.c, parse.y, thread_pthread.c: non-existing function declarations
-	  removed.
-
-Sat Jun 18 08:12:54 2011  Tanaka Akira  <akr@fsij.org>
-
-	* common.mk: dependencies updated.
-
-	* tool/update-deps: new file to assist update dependencies in
-	  common.mk.
-
-Sat Jun 18 07:27:27 2011  Tanaka Akira  <akr@fsij.org>
-
-	* internal.h: declare internal functions here.
-
-	* node.h: declare NODE dependent internal functions here.
-
-	* iseq.h: declare rb_iseq_t dependent internal functions here.
-
-	* vm_core.h: declare rb_thread_t dependent internal functions here.
-
-	* bignum.c, class.c, compile.c, complex.c, cont.c, dir.c, encoding.c,
-	  enumerator.c, error.c, eval.c, file.c, gc.c, hash.c, inits.c, io.c,
-	  iseq.c, load.c, marshal.c, math.c, numeric.c, object.c, parse.y,
-	  proc.c, process.c, range.c, rational.c, re.c, ruby.c, string.c,
-	  thread.c, time.c, transcode.c, variable.c, vm.c,
-	  tool/compile_prelude.rb: don't declare internal functions declared
-	  in above headers.  include above headers if required.
-
-	  Note that rb_thread_mark() was declared as
-	  void rb_thread_mark(rb_thread_t *th) in cont.c but defined as
-	  void rb_thread_mark(void *ptr) in vm.c.  Now it is declared as
-	  the later in internal.h.
-
-Sat Jun 18 02:36:00 2011  Kenta Murata  <mrkn@mrkn.jp>
-
-	* ext/bigdecimal/bigdecimal.c (VpNewRbClass): fix type of the 2nd
-	  argument.
-
-	* ext/bigdecimal/bigdecimal.h: ditto.
-
-Sat Jun 18 02:30:00 2011  Kenta Murata  <mrkn@mrkn.jp>
-
-	* ext/bigdecimal/bigdecimal.c (BigMath_s_exp): move BigMath.exp from
-	  bigdecimal/math.rb.
-
-	* ext/bigdecimal/lib/bigdecimal/math.rb: ditto.
-
-	* test/bigdecimal/test_bigdecimal.rb: move test for BigMath.exp from
-	  test/bigdecimal/test_bigmath.rb.
-
-	* test/bigdecimal/test_bigmath.rb: ditto.
-
-Sat Jun 18 00:20:54 2011  Tadayoshi Funaba  <tadf@dotrb.org>
-
-	* ext/date/date_core.c: do not define wnum[01].
-
-Fri Jun 17 18:57:36 2011  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* compile.c (iseq_compile_each): fix return value of obj[a,*b]=c.
-
-Fri Jun 17 13:09:45 2011  Eric Hodel  <drbrain@segment7.net>
-
-	* ext/curses/curses.c:  Clean up documentation.
-
-Fri Jun 17 09:25:14 2011  Eric Hodel  <drbrain@segment7.net>
-
-	* ext/curses/curses.c:  Document curses constants.  Patch by Vincent
-	  Batts.  [Ruby 1.9 - Bug #4880]
-
-Fri Jun 17 09:11:05 2011  Eric Hodel  <drbrain@segment7.net>
-
-	* object.c:  Document Module#method_added and #method_removed.
-	  Patch by Bryce Kerley.  [Ruby 1.9 - Feature #4867]
-
-Fri Jun 17 08:50:16 2011  Eric Hodel  <drbrain@segment7.net>
-
-	* io.c:  Improve documentation of IO and File open and new.
-	  Patch by Roger Pack.  [Ruby 1.9 - Bug #4790]
-
-Fri Jun 17 07:53:50 2011  Eric Hodel  <drbrain@segment7.net>
-
-	* lib/csv.rb:  Document #raw_encoding.  Patch by David Czarnecki.
-	  [Ruby 1.9 - Bug #4874]
-
-Fri Jun 17 07:46:50 2011  Eric Hodel  <drbrain@segment7.net>
-
-	* lib/benchmark.rb:  Document Benchmark::Tms#memberwise.  Patch by
-	  David Czarnecki.  [Ruby 1.9 - Bug #4873]
-
-Fri Jun 17 07:38:31 2011  Eric Hodel  <drbrain@segment7.net>
-
-	* lib/prettyprint.rb:  Improve documentation.  Patch by Ysiad
-	  Ferreiras.  [#4834]
-
-Fri Jun 17 07:23:03 2011  Eric Hodel  <drbrain@segment7.net>
-
-	* array.c (rb_ary_drop):  Improve documentation.  Patch by Caley Woods.
-	  [Ruby 1.9 - Bug #4858]
-
-Fri Jun 17 06:11:31 2011  Eric Hodel  <drbrain@segment7.net>
-
-	* lib/webrick/log.rb:  Improve documentation of BasicLog and Log.
-	  Patch by Olivier Brisse.  [Ruby 1.9 - Bug #4833]
-	* lib/webrick/httpstatus.rb:  Improve documentation of
-	  WEBrick::HTTPStatus.  Patch by Olivier Brisse.
-	  [Ruby 1.9 - Bug #4833]
-
-Fri Jun 17 04:48:22 2011  Koichi Sasada  <ko1@atdot.net>
-
-	* thread_pthread.c, thread_pthread.h: remove unused variables.
-	  (native_thread_data_t::gvl_cond, native_thread_data_t::gvl_next)
-
-Thu Jun 16 14:32:31 2011  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* time.c (rb_time_new): prevent overflow by "* 1000".
-
-Fri Jun 17 03:07:36 2011  Koichi Sasada  <ko1@atdot.net>
-
-	* benchmark/bm_vm4_thread_create_join.rb,
-	  benchmark/bm_vm4_thread_mutex[1-3].rb: renamed to
-	  bm_thread_* (fix last rename).
-
-Fri Jun 17 02:26:47 2011  Koichi Sasada  <ko1@atdot.net>
-
-	* thread_pthread.c (native_thread_create): fix debug message.
-	  (add last newline)
-
-Thu Jun 16 23:40:49 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* thread.c (rb_thread_schedule_rec): fix {UN,}LIKELY macro misuse.
-	* gc.c (rb_newobj): ditto.
-	* vm_insnhelper.c (vm_method_search): ditto.
-
-Thu Jun 16 20:06:15 2011  Shota Fukumori  <sorah@tubusu.net>
-
-	* test/testunit/test_parallel.rb: Fix Regexp for test.
-
-	* test/testunit/tests_for_parallel/test_third.rb: Use
-	  Test::Unit::TestCase#on_parallel_worker? for detecting worker.
-
-	* lib/test/unit/testcase.rb(Test::Unit::TestCase#on_parallel_worker?):
-	  New Method Test::Unit::TestCase#on_parallel_worker? returns true
-	  when a testcase is running on parallel worker.
-	* lib/test/unit/parallel.rb(Test::Unit::TestCase#on_parallel_worker?):
-	  ditto.
-
-Thu Jun 16 19:27:12 2011  Hiroshi Nakamura  <nahi@ruby-lang.org>
-
-	* test/test_securerandom.rb: Add testcase.  This testcase does NOT aim
-	  to test cryptographically strongness and randomness.  It includes
-	  the test for PID recycle issue of OpenSSL described in #4579 but
-	  it's disabled by default.
-
-Thu Jun 16 17:55:07 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* test/ruby/test_io.rb (TestIO#test_copy_stream_socket): fix
-	  test hanging up issue. Patch by CHIKANAGA Tomoyuki.
-
-Thu Jun 16 15:17:39 2011  Eric Hodel  <drbrain@segment7.net>
-
-	* variable.c (const_missing):  Add simple example of const_missing.
-	  Patch by Anuj Dutta.  [Ruby 1.9 - Bug #4794]
-
-Thu Jun 16 15:09:29 2011  Eric Hodel  <drbrain@segment7.net>
-
-	* lib/monitor.rb:  Improve documentation.  Patch by Sandor Szucs.
-	  [Ruby 1.9 - Bug #4823]
-
-Thu Jun 16 14:54:09 2011  Eric Hodel  <drbrain@segment7.net>
-
-	* lib/webrick/utils.rb: Document WEBrick::Utils.  Patch by Olivier
-	  Brisse.  [Ruby 1.9 - Bug #4819]
-
-Thu Jun 16 14:26:46 2011  Eric Hodel  <drbrain@segment7.net>
-
-	* lib/webrick/httpservlet/erbhandler.rb:  Allow the ERB document to
-	  alter the content-type of the response.  [Ruby 1.9 - Bug #4685]
-
-Thu Jun 16 14:15:47 2011  Eric Hodel  <drbrain@segment7.net>
-
-	* lib/timeout.rb: Clarify timeout duration types.  Patch by Alf Mikula.
-	  [Ruby 1.9 - Bug #4791]
-	* lib/net/http.rb: ditto
-
-Thu Jun 16 13:25:25 2011  Eric Hodel  <drbrain@segment7.net>
-
-	* lib/rdoc*:  Import RDoc 3.7 release candidate
-
-Thu Jun 16 11:35:09 2011  Shugo Maeda  <shugo@ruby-lang.org>
-
-	* lib/net/imap.rb (search_response): parses SEARCH responses from
-	  the Yahoo IMAP server correctly.  patched by Mark Nadig.  [Bug #4509]
-
-Thu Jun 16 09:12:38 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* fix for build on solaris 10.
-
-Thu Jun 16 09:08:39 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* test/io/console/test_io_console.rb (TestIO_Console#test_sync):
-	  fix for daemon process.
-
-Thu Jun 16 07:58:01 2011  Shota Fukumori  <sorah@tubusu.net>
-
-	* test/testunit/test_parallel.rb(test_ignore_tzero): Test for r32109.
-
-	* test/testunit/tests_for_parallel/test_third.rb: Use another way to
-	  detect that test is running on worker. This fixes sometimes
-	  TestParallel failing.
-
-Thu Jun 16 07:20:06 2011  Shota Fukumori  <sorah@tubusu.net>
-
-	* lib/test/unit.rb(Test::Unit::Runner#_run_parallel): Ignore -j0
-	  because it makes blocking forever by IO.select.
-
-Thu Jun 16 03:08:11 2011  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* test/testunit/test_parallel.rb (TestParallel::TestParallelWorker#
-	  setup): now can run on Windows, probably.
-
-	* test/testunit/test_parallel.rb (TestParallel::TestParallel#setup):
-	  ditto.
-
-Thu Jun 16 03:00:26 2011  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* thread.c (do_select): Windows: no need to poll if select(2) is
-	  cancelable.
-
-	* thread_win32.c (native_fd_select): new function to make select(2)
-	  cancelable.
-
-	* thread_win32.c (rb_w32_check_interrupt): new function for checking
-	  interrupt.
-
-	* win32/win32.c (rb_w32_select_with_thread): new function. cancelable
-	  select(2).
-
-	* win32/win32.c (rb_w32_select): use above function internally.
-
-Wed Jun 15 23:30:45 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* gc.c: fix a regression by r31690 on AIX because AIX malloc
-	  return NULL if it's passed 0. But some caller don't expect it.
-	  patch by Yutaka Kanemoto. [ruby-dev:43779]
-	(vm_malloc_prepare): return calculated size.
-	(vm_xmalloc): use above result.
-	(vm_xcalloc): ditto.
-
-Wed Jun 15 23:11:35 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* thread.c: remove BLOCKING_REGION_CORE() macro. It's no longer used
-	  since r32022.
-
-Wed Jun 15 21:00:47 2011  Martin Bosslet  <Martin.Bosslet@googlemail.com>
-
-	* test/openssl/test_config.rb: execute based on the existence of the
-	  OpenSSL module.
-
-Wed Jun 15 12:35:11 2011  Tanaka Akira  <akr@fsij.org>
-
-	* test/ruby/test_io.rb (test_copy_stream_socket): wait a child process
-	  before SIGUSR1 handler is removed.
-
-	* test/pathname/test_pathname.rb (define_assertion): use line number
-	  for test method names.
-
-Wed Jun 15 10:37:43 2011  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* file.c (rb_stat_rdev): use DEVT2NUM.
-
-	* file.c (rb_stat_rdev_major): ditto.
-
-	* file.c (rb_stat_rdev_minor): ditto.
-
-Wed Jun 15 05:12:59 2011  Hidetoshi NAGAI  <nagai@ai.kyutech.ac.jp>
-
-	* ext/tk/tcltklib.c (lib_eventloop_core): revert the last change (it's
-	  the part for ruby_1_8), and use rb_thread_check_ints() when RUBY_VM
-	  is defined.
-
-Wed Jun 15 04:42:47 2011  Koichi Sasada  <ko1@atdot.net>
-
-	* benchmark/bm_vm3_thread_*.rb: renamed bm_vm3_thread_*.rb to
-	  benchmark/bm_vm_thread_*.rb.
-
-Wed Jun 15 04:28:39 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* benchmark/bm_vm4_thread_pass.rb: rename bm_vm4* to
-	  bm_vm_thread_*. suggested by ko1.
-	* benchmark/bm_vm4_pipe.rb: ditto.
-	* benchmark/bm_vm4_alive_check1.rb: ditto.
-	* benchmark/bm_vm4_pass_flood.rb: ditto.
-
-Wed Jun 15 03:52:50 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* benchmark/bm_vm4_pass_flood.rb: new benchmark for GVL fairness.
-	* benchmark/bm_vm4_alive_check1.rb: ditto.
-
-Wed Jun 15 01:27:53 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* thread_pthread.c (gvl_yield): fix live lock issue on 1-2 cpus
-	  system. It's additional fix for r32021.
-	* thread_pthread.c (gvl_init): add switch_wait_cond.
-	* thread_pthread.h (typedef struct rb_global_vm_lock_struct): ditto.
-
-Tue Jun 14 23:16:22 2011  Tanaka Akira  <akr@fsij.org>
-
-	* bootstraptest/runner.rb (show_progress): refine verbose mode.
-	  (exec_test): ditto.
-
-Tue Jun 14 23:02:36 2011  Tanaka Akira  <akr@fsij.org>
-
-	* bootstraptest/runner.rb (show_progress): extracted from assert_check.
-	  (assert_check): use show_progress.
-	  (assert_normal_exit): ditto.
-	  (assert_finish): ditto.
-	  (flunk): ditto.
-
-Tue Jun 14 22:51:42 2011  Tadayoshi Funaba  <tadf@dotrb.org>
-
-	* test/date/test_*.rb: added tests.
-
-Tue Jun 14 22:09:58 2011  Tadayoshi Funaba  <tadf@dotrb.org>
-
-	* ext/date/date_core.c: renamed some functions.
-	* ext/date/date_core.c: modified doc.
-
-Tue Jun 14 21:26:01 2011  CHIKANAGA Tomoyuki  <nagachika00@gmail.com>
-
-	* cont.c (cont_save_thread): add new utility function.
-	  rb_context_t::saved_thread.machine_stack_start and
-	  machine_stack_end should be cleared immediately after a snapshot of
-	  current thread is stored to saved_thread. [ruby-dev:43680] [Bug #4855]
-	  this change aims to get rid of unnecessary GC mark at machine stack.
-
-Tue Jun 14 19:50:49 2011  Tanaka Akira  <akr@fsij.org>
-
-	* test/ruby/test_autoload.rb: remove temporary directory.
-
-Tue Jun 14 11:05:03 2011  Narihiro Nakamura  <narihiro@netlab.jp>
-
-	* gc.c (rb_gc_set_params): call initial_expand_heap if
-	  initial_heap_min_slots is set.
-
-Tue Jun 14 11:02:08 2011  Narihiro Nakamura  <narihiro@netlab.jp>
-
-	* gc.c: use size_t.
-
-Tue Jun 14 01:10:38 2011  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* test/coverage/test_coverage.rb: add a test for restart.  a patch
-	  from Xavier Shay.  [ruby-core:36745]
-
-Tue Jun 14 01:05:10 2011  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* ext/coverage/coverage.c: make it restartable.  [ruby-core:36539]
-
-Mon Jun 13 23:55:40 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* thread.c (rb_thread_schedule_rec): call gvl_yield() unconditionally.
-	* thread_pthread.c: remove HAVE_GVL_YIELD macro.
-	* thread_win32.c (gvl_yield): new. this fallback logic was moved from
-	  rb_thread_schedule_rec().
-
-Mon Jun 13 23:50:25 2011  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* ext/io/console/console.c (console_dev): typo.
-
-Mon Jun 13 23:38:23 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* parse.y (parser_parse_string): flush delayed token.  based on a
-	  patch by Masaya Tarui in [ruby-dev:43762].  Bug #4544
-
-	* parse.y (yylex): revert r24557.  delayed token at the end of
-	  string should be flushed already by the above change.
-
-Mon Jun 13 23:33:31 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* ext/io/console/console.c (console_dev): console should be
-	  unbuffered.
-
-	* ext/io/console/console.c (console_dev): take care of no-ctty
-	  case.
-
-Mon Jun 13 23:06:12 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* thread_pthread.c: rewrite GVL completely. This fix improve some
-	  benchmark dramatically (e.g. vm3_thread_mutex result changed
-	  form 120.601sec to 3.426sec).
-	* thread_win32.c: ditto.
-	* thread_pthread.h: ditto.
-	* vm_core.h: ditto.
-	* thread.c: ditto.
-
-Mon Jun 13 23:11:52 2011  Tanaka Akira  <akr@fsij.org>
-
-	* test/socket/test_unix.rb: don't use Thread.abort_on_exception.
-
-Mon Jun 13 23:05:01 2011  Tanaka Akira  <akr@fsij.org>
-
-	* ext/socket/unixsocket.c (unix_send_io): race condition fixed.
-	  (unix_recv_io): ditto.
-	  fixed by Eric Wong.  [ruby-core:35574]
-
-	* test/socket/test_unix.rb: test added for above problem.
-
-Mon Jun 13 21:41:05 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* thread_win32.c (native_cond_signal): remove unnecessary rb_bug().
-	  It's additional fix for r32021. [Bug #4696]
-
-Mon Jun 13 20:50:49 2011  Martin Bosslet  <Martin.Bosslet@googlemail.com>
-
-	* test/openssl/test_ec.rb
-	  test/openssl/test_pkey_ec.rb: merge both files into test_pkey_ec.rb.
-	  Removed redundant group instantiation from PKey tests.
-	* test/openssl/utils.rb: only create TEST_PKEY_EC_P256V1 if EC is
-	  defined.
-
-Mon Jun 13 20:28:24 2011  Martin Bosslet  <Martin.Bosslet@googlemail.com>
-
-	* test/openssl/digest.rb: remove MDC2 from test, it is not available
-	  by default in an OpenSSL installation.
-
-Mon Jun 13 20:18:55 2011  Koichi Sasada  <ko1@atdot.net>
-
-	* vm_core.h, vm_insnhelper.h: move decl. of
-	  ruby_vm_global_state_version and related macros
-	  from vm_core.h to vm_insnhelper.h.
-
-	* vm.c (vm_clear_all_cache): added.  This function is called
-	  when ruby_vm_global_state_version overflows.
-	  TODO: vm_clear_all_inline_method_cache() is only place holder.
-	        We need to implement it ASAP.
-
-	* vm_method.c (vm_clear_global_method_cache): added.
-
-Mon Jun 13 19:46:21 2011  Keiju Ishitsuka  <keiju@ishitsuka.com>
-
-	* lib/cmath.rb: add new method Object#real?. fix #3137
-
-Mon Jun 13 18:52:00 2011  Kenta Murata  <mrkn@mrkn.jp>
-
-	* ext/bigdecimal/bigdecimal.c (is_kind_of_BigDecimal): new function to
-	  examine the whether the object is kind of BigDecimal.
-
-Mon Jun 13 18:49:00 2011  Kenta Murata  <mrkn@mrkn.jp>
-
-	* ext/bigdecimal/bigdecimal.c (BigDecimalCmp): use GetVpValueWithPrec
-	  for Float and Rational arguments.
-
-	* test/bigdecimal/test_bigdecimal.rb (test_new, test_cmp, test_power):
-	  add and modify tests for the above change.
-
-	* ext/bigdecimal/bigdecimal.c (BigDecimalCmp): modify coding style to
-	  match ruby's standard.
-
-Mon Jun 13 18:33:04 2011  Tanaka Akira  <akr@fsij.org>
-
-	* lib/securerandom.rb (SecureRandom.random_bytes): modify PRNG state
-	  to prevent random number sequence repetition at forked child
-	  process which has same pid.
-	  reported by Eric Wong.  [ruby-core:35765]
-
-Mon Jun 13 17:02:34 2011  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* lib/net/http.rb (Net::HTTP#use_ssl?): require 'openssl' only when
-	  https is needed. fixes r31933.
-
-Mon Jun 13 14:35:00 2011  Kenta Murata  <mrkn@mrkn.jp>
-
-	* lib/cmath.rb (CMath.cbrt): returns the principal value of the cube
-	  root of the argument.  fix #3676
-
-	* test/test_cmath.rb (test_cbrt_returns_principal_value_of_cube_root):
-	  test for the above change.
-
-Mon Jun 13 14:17:00 2011  Kenta Murata  <mrkn@mrkn.jp>
-
-	* lib/test/unit.rb (Test::Unit::GlobOption#non_options): fix typo.
-
-Mon Jun 13 13:04:20 2011  Martin Bosslet  <Martin.Bosslet@googlemail.com>
-
-	* ext/openssl/ossl_digest.c: fix error for digests that have no oid
-	(e.g. DSS1).
-	* test/openssl/test_digest.c: add tests for this.
-
-Mon Jun 13 12:51:51 2011  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* lib/yaml.rb: load psych only when syck is not loaded.
-
-Mon Jun 13 12:23:39 2011  NARUSE, Yui  <naruse@ruby-lang.org>
-
-Mon Jun 13 12:23:39 2011  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* ext/psych/lib/psych/deprecated.rb (Object#to_yaml_properties):
-	  undef to_yaml_properties before redefine it.
-
-	* ext/syck/lib/syck/rubytypes.rb: ditto.
-
-Mon Jun 13 11:30:10 2011  Martin Bosslet  <Martin.Bosslet@googlemail.com>
-
-	* ext/openssl/ossl_digest.c: allow Digests to be created by sn, ln or
-	  oid.
-	* test/openssl/test_digest.rb: add tests for this.
-	  [Ruby 1.9 - Feature #4412] [ruby-core:35319]
-
-Mon Jun 13 10:54:03 2011  Martin Bosslet  <Martin.Bosslet@googlemail.com>
-
-	* ext/openssl/pkey_dh.c: corrected documentation.
-	* test/openssl/utils.rb: add test key for DH.
-	* test/openssl/test_pkey_dh.rb: add tests.
-
-Mon Jun 13 10:13:08 2011  Martin Bosslet  <Martin.Bosslet@googlemail.com>
-
-	* ext/openssl/pkey_dh.c: clarify difference between DH#public_key and
-	DH#pub_key in documentation.
-
-Mon Jun 13 05:50:43 2011  Martin Bosslet  <Martin.Bosslet@googlemail.com>
-
-	* NEWS: introduce PKey.read.
-
-Mon Jun 13 05:17:29 2011  Martin Bosslet  <Martin.Bosslet@googlemail.com>
-
-	* ext/openssl/ossl_pkey.c: added PKey.read module function that allows
-	  reading arbitrary public/private keys from DER-/PEM-encoded File or
-	  string instances.
-	* ext/openssl/ossl_pkey_dh.c: improved documentation.
-	* test/openssl/utils.rb: added EC test key.
-	* test/openssl/test_pkey_rsa.rb
-	  test/openssl/test_pkey_dsa.rb: Test PKey.read. Reuse keys from
-	  OpenSSL::TestUtils.
-	* test/openssl/test_pkey_ec.rb: Created test file for EC tests.
-	  Test PKey.read.
-	  [Ruby 1.9 - Feature #4424] [ruby-core:35330]
-
-Mon Jun 13 04:42:24 2011  Koichi Sasada  <ko1@atdot.net>
-
-	* ext/objspace/objspace.c (total_i): fix to skip no ruby objects.
-
-Mon Jun 13 03:07:38 2011  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* test/benchmark/test_benchmark.rb (capture_output):
-	  replace '-' as space. On NetBSD, subtract between two Process.times
-	  after and before the short process may return negative value like:
-	  t0=Process.times; yield; t1=Process.times; p t1.utime-t0.utime
-
-Mon Jun 13 02:40:23 2011  Martin Bosslet  <Martin.Bosslet@googlemail.com>
-
-	* test/openssl/test_pkey_dsa.rb: Test for DSA#syssign/sysverify.
-
-Mon Jun 13 01:59:19 2011  Martin Bosslet  <Martin.Bosslet@googlemail.com>
-
-	* ext/openssl/ossl_pkey_dh.c: completed documentation.
-	* ext/openssl/ossl_pkey_dsa.c: corrected examples. Improved parameter
-	  sections.
-
-Mon Jun 13 00:25:10 2011  Martin Bosslet  <Martin.Bosslet@googlemail.com>
-
-	* ext/openssl/ossl_pkey_dsa.c: completed documentation.
-
-Sun Jun 12 23:36:46 2011  Masatoshi SEKI  <m_seki@mva.biglobe.ne.jp>
-
-	* lib/drb/drb.rb (kill_sub_thread): remove the method. [ruby-core:34185]
-
-Sun Jun 12 21:01:56 2011  Tadayoshi Funaba  <tadf@dotrb.org>
-
-	* ext/date/date_core.c (d_lite_marshal_load): should give converted value.
-
-Sun Jun 12 20:36:30 2011  Tadayoshi Funaba  <tadf@dotrb.org>
-
-	* ext/date/date_core.c: edited doc.
-
-Sun Jun 12 18:12:07 2011  Koichi Sasada  <ko1@atdot.net>
-
-	* benchmark/bm_vm3_clearmethodcache.rb: added.
-
-Sun Jun 12 17:40:29 2011  Koichi Sasada  <ko1@atdot.net>
-
-	* vm_method.c (rb_clear_cache*): update only vm state version.
-
-	* vm_method.c (rb_method_entry_get_without_cache, rb_method_entry):
-	  Fill method cache entry with vm state version, and
-	  check current vm state version for method (cache) look up.
-	  This modification speed-up invalidating of global method cache table.
-	  [Ruby 1.9 - Feature #3905] [ruby-core:36908]
-
-Sun Jun 12 16:19:48 2011  Hidetoshi NAGAI  <nagai@ai.kyutech.ac.jp>
-
-	* ext/tk/extconf.rb: fail on Mac OS X. [Bug #4853][ruby-dev:43655]
-
-Sun Jun 12 15:56:08 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* thread.c: remove th->transition_for_lock. It's thread unsafe.
-	  [Bug #4723][ruby-dev:43563]
-
-Sun Jun 12 15:47:35 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* thread.c: introduce spurious wakeup safe deadlock check.
-	  [Bug #4696][ruby-dev:43554]
-
-Sun Jun 12 13:33:52 2011  Koichi Sasada  <ko1@atdot.net>
-
-	* benchmark/bm_vm3_thread_mutex.rb: remove it.
-
-	* benchmark/bm_vm3_thread_mutex[1-3].rb: added 3 benchmarks.
-	    1: one thread with one mutex (no contention).
-	    2: two threads with one mutex (contention).
-	    3: 1000 threads with one mutex (huge number of contention)
-	  Above removed benchmark was type 3.
-	  Therefore, this commit adds type 1 and 2 benchmark.
-
-Sun Jun 12 11:16:59 2011  Tanaka Akira  <akr@fsij.org>
-
-	* io.c: use select() appropriately for sendfile().
-	  Fixed by Eric Wong.  [ruby-core:36150]
-	  (maygvl_copy_stream_wait_readwrite): removed.
-	  (nogvl_copy_stream_sendfile): use nogvl_copy_stream_wait_write and
-	  maygvl_copy_stream_wait_read instead of
-	  maygvl_copy_stream_wait_readwrite.
-
-Sun Jun 12 09:32:13 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* atomic.h (ATOMIC_OR): _InterlockedOr is not available on mingw.h
-	* gc.c (rb_gc_set_params): VM_OBJSPACE is disabled on mingw.
-
-Sun Jun 12 01:07:09 2011  Tadayoshi Funaba  <tadf@dotrb.org>
-
-	* ext/date/date_core.c: edited doc.
-
-Sat Jun 11 23:18:00 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* vm_core.h (RUBY_VM_SET_TIMER_INTERRUPT, RUBY_VM_SET_INTERRUPT,
-	  RUBY_VM_SET_FINALIZER_INTERRUPT): use atomic ops for preventing
-	  interrupt_flag bit lost. [Bug #4770][ruby-dev:43467]
-	* thread.c (rb_threadptr_execute_interrupts_rec): ditto.
-	* vm_core.h (typedef struct rb_thread_struct): change type of
-	  interrupt_flag to rb_atomic_t.
-	* atomic.h: move atomic ops definition from signal.c.
-	* signal.c: remove atomic ops definition.
-	* common.mk (gc, signal, thread, cont): add to dependency to atomic.h.
-
-Sat Jun 11 23:23:52 2011  Tadayoshi Funaba  <tadf@dotrb.org>
-
-	* ext/date/date_core.c: edited doc.
-
-Sat Jun 11 23:02:36 2011  Hiroshi Nakamura  <nahi@ruby-lang.org>
-
-	* ext/openssl/lib/openssl/buffering.rb (module OpenSSL):
-	  Buffering#each_byte should return String in accordance with IO in
-	  1.9.
-
-	* test/openssl/test_buffering.rb (class OpenSSL): add tests for getc
-	  and each_byte.
-
-Sat Jun 11 22:41:37 2011  Tadayoshi Funaba  <tadf@dotrb.org>
-
-	* time.c: a correction of doc for strftime (%v).
-
-Sat Jun 11 22:30:53 2011  Tadayoshi Funaba  <tadf@dotrb.org>
-
-	* ext/date/date_core.c: replaced doc for strftime based on Time's one.
-
-Sat Jun 11 22:07:56 2011  Tadayoshi Funaba  <tadf@dotrb.org>
-
-	* ext/date/date_core.c (datetime_s_{iso8601,rfc3339,xmlschema,rfc2822,httpdate}):
-	  do not take argument comp.
-
-Sat Jun 11 21:58:31 2011  Tadayoshi Funaba  <tadf@dotrb.org>
-
-	* ext/date/date_core.c: added examples.
-
-Sat Jun 11 19:40:45 2011  Narihiro Nakamura  <authornari@gmail.com>
-
-	* gc.c: expand heap if initial_heap_min_slots is bigger than
-	  HEAP_MIN_SLOTS.
-
-Sat Jun 11 19:42:50 2011  WATANABE Hirofumi  <eban@ruby-lang.org>
-
-	* ChangeLog (vim): set shiftwidth to 2.
-
-Sat Jun 11 19:27:06 2011  Hiroshi Nakamura  <nahi@ruby-lang.org>
-
-	* ext/openssl/ossl_x509req.c: raise RequestError instead of
-	  CertificateError when Request#to_der gets an error from OpenSSL.
-	  Patch from Ippei Obayashi, see #4420. I cannot write a test for
-	  this... Request does not allow to create broken bytes...
-
-Sat Jun 11 19:34:51 2011  Tadayoshi Funaba  <tadf@dotrb.org>
-
-	* ext/date/date_core.c (Date::(ABBR_)?(MONTH|DAY)NAMES): should be usascii.
-
-Sat Jun 11 19:24:33 2011  Tadayoshi Funaba  <tadf@dotrb.org>
-
-	* ext/date/date_core.c: rewrote doc.
-
-Sat Jun 11 19:04:15 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* lib/test/unit.rb (Test::Unit::GlobOption#non_options): should run
-	  with 1.8.
-
-Sat Jun 11 18:05:57 2011  WATANABE Hirofumi  <eban@ruby-lang.org>
-
-	* bootstraptest/runner.rb: should initialize $stress to avoid warnings.
-
-Sat Jun 11 18:02:09 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* io.c (io_getc): should be 7bit if ascii.  fixes #4557
-
-Sat Jun 11 16:52:16 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* numeric.c (rb_enc_uint_chr): fix message format. Bug#4869
-
-Sat Jun 11 16:28:25 2011  Kouhei Sutou  <kou@cozmixng.org>
-
-	* lib/rexml/formatters/pretty.rb
-	  (REXML::Formatters::Pretty#write_text),
-	  test/rexml/test_core.rb
-	  (Tester#test_pretty_format_long_text_finite): don't ignore
-	  'width' parameter in pretty formatter. fixes #4498
-	  Reported by Michael Frasca. Thanks!!!
-
-Sat Jun 11 16:11:36 2011  Kouhei Sutou  <kou@cozmixng.org>
-
-	* test/rexml/test_core.rb
-	  (Tester#test_pretty_format_long_text_finite): remove needless
-	  assert_nothing_raised.
-
-Sat Jun 11 16:04:03 2011  Kouhei Sutou  <kou@cozmixng.org>
-
-	* lib/rexml/parsers/xpathparser.rb
-	  (REXML::Parsers::XPathParser#parse),
-	  test/rexml/test_elements.rb
-	  (ElementsTester#test_each_with_frozen_condition):
-	  don't modify original XPath. fixes #4161
-	  Reported by Pavel Shved. Thanks!!!
-
-Sat Jun 11 15:53:27 2011  Kouhei Sutou  <kou@cozmixng.org>
-
-	* test/rexml/test_elements.rb (ElementsTester): remove needless
-	  prefix from test name.
-
-Sat Jun 11 15:36:36 2011  Martin Duerst  <duerst@it.aoyama.ac.jp>
-	* common.mk: fixed a grammatical error
-
-Sat Jun 11 14:20:16 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* vm.c (thread_memsize): don't ignore size of th->local_storage.
-
-Sat Jun 11 10:32:46 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* lib/mkmf.rb: should quote arch_hdrdir and libpath for the case
-	  installed prefix contains spaces.
-
-Sat Jun 11 10:20:52 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* thread_pthread.c (native_cond_timeout): wrap conditionally used
-	  label.
-
-	* thread_pthread.c (native_sleep): remove unused variable.
-
-Sat Jun 11 10:15:50 2011  Tanaka Akira  <akr@fsij.org>
-
-	* thread.c (rb_thread_execute_interrupts): use GetThreadPtr to extract
-	  rb_thread_t from VALUE.
-	  reported by Motohiro KOSAKI.  [ruby-dev:43700]
-
-Sat Jun 11 10:00:49 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* ruby.c (ruby_process_options): add missing return type.
-
-Fri Jun 10 23:18:09 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* ext/tk/tcltklib.c (lib_eventloop_core): replace CHECK_INTS with
-	  rb_thread_check_ints(). Because current code can't be compiled.
-
-Fri Jun 10 16:38:13 2011  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* encoding.c (rb_locale_charmap): When ruby process is run as Windows
-	  Service the console codepage is not set, GetConsoleCP returns 0.
-	  So on such environment, use GetACP().
-	  http://blogs.msdn.com/b/michkap/archive/2005/02/08/369197.aspx
-	  patched by Rafal Bigaj [ruby-core:36832] [Bug #4854]
-
-Fri Jun 10 14:34:24 2011  Koichi Sasada  <ko1@atdot.net>
-
-	* common.mk: restore TESTRUN_SCRIPT to "$(srcdir)/test.rb".
-	  TESTRUN_SCRIPT is used by "make run", "make gdb" and so on.
-
-Fri Jun 10 13:01:24 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* test/ruby/test_module.rb (TestModule#remove_rake_mixins): remove all
-	  module related to Rake.
-
-Fri Jun 10 09:52:38 2011  Eric Hodel  <drbrain@segment7.net>
-
-	* encoding.c:  Mention that Encoding.compatible? can work with more
-	  than just Strings.
-
-Fri Jun 10 02:25:53 2011  Aaron Patterson <aaron@tenderlovemaking.com>
-
-	* ext/psych/lib/psych.rb: updating version to match released gem.
-
-Fri Jun 10 01:06:29 2011  Tadayoshi Funaba  <tadf@dotrb.org>
-
-	* ext/bigdecimal (BigDecimal_to_i): Integer#** may return flonum.
-
-Fri Jun 10 00:35:12 2011  Tadayoshi Funaba  <tadf@dotrb.org>
-
-	* complex.c (string_to_c_internal): uses rb_reg_nth_match;
-	* rational.c (string_to_r_internal): ditto.
-
-Fri Jun 10 00:25:03 2011  CHIKANAGA Tomoyuki  <nagachika00@gmail.com>
-
-	* gc.c: remove an unused declaration.
-
-Fri Jun 10 00:24:04 2011  Tadayoshi Funaba  <tadf@dotrb.org>
-
-	* rational.c (string_to_r): Rational#** may return flonum.
-
-Thu Jun  9 23:57:53 2011  Tanaka Akira  <akr@fsij.org>
-
-	* io.c: fix IO.copy_stream interrupt handling.
-	  based on the patch by Eric Wong.  [ruby-core:36156]
-
-	* vm_core.h (rb_thread_call_with_gvl): don't declare here.
-
-	* thread.c: include internal.h.
-	  (rb_thread_execute_interrupts): new function.
-
-	* internal.h (rb_thread_execute_interrupts): declared.
-	  (rb_thread_call_with_gvl): declared.
-
-Thu Jun  9 23:34:01 2011  CHIKANAGA Tomoyuki  <nagachika00@gmail.com>
-
-	* gc.c (rb_objspace_call_finalizer): use rb_typeddata_is_kind_of() for
-	  type check to get rid of a double free when main Thread has singleton
-	  class. [ruby-core:36741] [Bug #4828]
-	* thread.c (rb_obj_is_mutex): add a new utility function.
-	* vm.c (rb_obj_is_thread): ditto.
-
-Thu Jun  9 22:53:49 2011  CHIKANAGA Tomoyuki  <nagachika00@gmail.com>
-
-	* test/ruby/test_thread.rb (TestThread#test_kill_thread_subclass):
-	  add test for Thread.kill with Thread subclass instance.
-
-Thu Jun  9 22:31:47 2011  CHIKANAGA Tomoyuki  <nagachika00@gmail.com>
-
-	* test/ruby/test_thread.rb (TestThread#test_kill_wrong_argument):
-	  test for [ruby-core:35086].
-	  partially forward porting r31402 from ruby_1_9_2 branch.
-
-Thu Jun  9 18:36:00 2011  Kenta Murata <mrkn@mrkn.jp>
-
-	* string.c: Fix the ambiguous description of the behavior of
-	  rb_str_aref_m with a range.  It returns nil when the beginning of
-	  the range is greater than the end of the string rather than the range.
-
-Thu Jun  9 10:57:03 2011  Aaron Patterson <aaron@tenderlovemaking.com>
-
-	* ext/psych/lib/psych/visitors/to_ruby.rb: Hash subclasses can be read
-	  from YAML files.
-	* ext/psych/lib/psych/visitors/yaml_tree.rb: Hash subclasses can be
-	  dumped to YAML files.
-	* test/psych/test_hash.rb: corresponding test.
-
-Thu Jun  9 09:18:51 2011  Aaron Patterson <aaron@tenderlovemaking.com>
-
-	* ext/psych/lib/psych/visitors/to_ruby.rb: Ruby modules can be loaded
-	  from YAML files.
-	* ext/psych/lib/psych/visitors/yaml_tree.rb: Ruby modules can be
-	  dumped to YAML files.
-	* test/psych/test_class.rb: corresponding test.
-
-Thu Jun  9 09:05:04 2011  Aaron Patterson <aaron@tenderlovemaking.com>
-
-	* ext/psych/lib/psych/visitors/to_ruby.rb: Ruby classes can be loaded
-	  from YAML files.
-	* ext/psych/lib/psych/visitors/yaml_tree.rb: Ruby classes can be
-	  dumped to YAML files.
-	* test/psych/test_class.rb: corresponding test.
-
-Wed Jun  8 21:38:57 2011  CHIKANAGA Tomoyuki  <nagachika00@gmail.com>
-
-	* cont.c (root_fiber_alloc): set root fiber's status RUNNING.
-	  in cont_mark() only RUNNING fiber's machine stack is marked.
-	  root fiber's status should be RUNNING at the beginning regardless of
-	  FIBER_USE_NATIVE. [ruby-core:36735] fixes #4827
-
-Tue Jun  7 20:50:11 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* doc/irb/irb.rd: fix typo. patch by Nobuhiro IMAI.
-	  [Bug #4843] [ruby-dev:43639]
-	* doc/irb/irb.rd.ja: ditto.
-	* doc/ChangeLog-YARV: ditto.
-
-Tue Jun  7 18:52:55 2011  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* lib/rubygems/user_interaction.rb (Gem::StreamUI#tty?): IO#tty? of
-	  Windows has been fixed at r29969.
-
-	* test/rubygems/test_gem_stream_ui.rb: now can run tests.
-
-Tue Jun  7 18:36:41 2011  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* test/rubygems/test_gem.rb (TestGem#{test_self_user_home_userprofile,
-	  test_self_user_home_user_drive_and_path}): should simply ignore
-	  meaningless tests instead of skipping them.
-
-Tue Jun  7 18:15:00 2011  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* test/ruby/test_rubyoptions.rb (TestRubyOptions#test_set_program_name):
-	  should show some messages when skipping tests.
-
-Tue Jun  7 13:59:47 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* ext/date/date_core.c (date_s_today, datetime_s_now): check the
-	  result of localtime_r().
-
-Tue Jun  7 13:36:51 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* ext/tk/extconf.rb: use $defs not $CPPFLAGS to get rid of
-	  command line escape issues on Windows.  fixed #4835.
-
-Tue Jun  7 03:18:45 2011  Kazuhiro NISHIYAMA  <zn@mbf.nifty.com>
-
-	* test/ruby/test_io.rb (TestIO#test_s_{,bin}write): do not create a
-	  file under /tmp. [Bug #4846]
-
-Mon Jun  6 22:51:43 2011  CHIKANAGA Tomoyuki  <nagachika00@gmail.com>
-
-	* cont.c: use #if FIBER_USE_NATIVE instead of #ifdef.
-	  you can suppress use of setcontext for Fiber with compile option
-	  -DFIBER_USE_NATIVE=0
-
-Mon Jun  6 21:59:23 2011  Tadayoshi Funaba  <tadf@dotrb.org>
-
-	* test/date/test_switch_hitter.rb: added a test.
-
-Mon Jun  6 21:37:45 2011  Tadayoshi Funaba  <tadf@dotrb.org>
-
-	* ext/date/date_core.c: added notes.
-
-Mon Jun  6 21:02:12 2011  Tadayoshi Funaba  <tadf@dotrb.org>
-
-	* ext/date/date_core.c: flattened format to strftimev.
-	* ext/date/date_core.c (date_strftime_internal): taints run.
-
-Mon Jun  6 15:10:17 2011  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* include/ruby/{defines,missing}.h (rb_infinity, rb_nan): move from
-	  defines.h to missing.h.  (couldn't use RUBY_EXTERN there.)
-
-Mon Jun  6 14:35:48 2011  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* test/rdoc/test_rdoc_markup_pre_process.rb (TestRDocMarkupPreProcess#
-	  {test_include_file,test_include_file_encoding_incompatible}): no
-	  need to write such workaround.  don't hide the bug of ruby. (and the
-	  bug is already fixed.)
-
-Mon Jun  6 14:11:11 2011  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* ext/date/date_core.c (valid_jd_sub): need to convert from VALUE to
-	  double.
-
-	* ext/date/date_core.c (offset_to_sec): get rid of a compiler warning.
-
-Mon Jun  6 14:09:08 2011  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* include/ruby/defines.h (rb_infinity, rb_nan): export for Windows.
-
-Mon Jun  6 10:54:45 2011  Shota Fukumori  <sorah@tubusu.net>
-
-	* lib/test/unit.rb(Test::Unit::Runner#puke):
-	  Add overriding from MiniTest::Unit#puke. This reverts minitest's fix
-	  that skip messages are hidden when not verbose mode (-v option).
-	  To hide skip messages, use --hide-skip option instead.
-
-Mon Jun  6 10:52:13 2011  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* lib/net/http.rb: don't use autoload.
-
-Mon Jun  6 09:39:43 2011  Aaron Patterson <aaron@tenderlovemaking.com>
-
-	* ext/psych/parser.c (parse): release event objects to plug memory
-	leak.  Thanks Mark J. Titorenko!
-
-Sun Jun  5 23:26:15 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* eval.c: remove rb_thread_stop_timer_thread function declaration.
-	  Instead, include vm_core.h.
-	* process.c: ditto.
-
-Sun Jun  5 21:38:51 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* thread_pthread.c (thread_timer): add to care a spurious wakeup.
-	  When native_cond_timedwait() return 0 by spurious wakeup, we
-	  don't have to neither 1) call timer_thread_function and 2)
-	  exit the timer thread.
-
-Sun Jun  5 17:50:01 2011  Tadayoshi Funaba  <tadf@dotrb.org>
-
-	* ext/date/date_core.c (m_real_cwyear): new.  derived from m_cwyear.
-	* ext/date/date_strftime.c: trivial changes.
-
-Sun Jun  5 17:22:01 2011  Hidetoshi NAGAI  <nagai@ai.kyutech.ac.jp>
-
-	* ext/tk/config_list.in: add new options for tcltklib.
-
-Sun Jun  5 10:06:50 2011  Tadayoshi Funaba  <tadf@dotrb.org>
-
-	* ext/date/date_tmx.h: now does not place decoded data.  allows to
-	  access indirectly via functions on demand.
-	* ext/date/date_strftime.c: ditto.
-	* ext/date/date_core.c: ditto.
-	* ext/date/date_core.c ({d|dt}_lite_to_s): use strftime.
-
-Sun Jun  5 06:22:02 2011  Tadayoshi Funaba  <tadf@dotrb.org>
-
-	* NEWS: wrote about changes of date.
-
-Sat Jun  4 16:59:26 2011  Tadayoshi Funaba  <tadf@dotrb.org>
-
-	* ext/date/date_core.c (d_lite_inspect): changed the format.
-	* ext/date/date_core.c: refactoring and fixing some bugs.
-
-Sat Jun  4 11:30:57 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* class.c (check_mix_method_i, do_mix_method_i): not mix methods
-	  renamed as nil.
-
-Sat Jun  4 04:04:41 2011  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* test/rubygems/test_gem_commands_which_command.rb:
-	  "missing" exists on ruby's top source directory. [Bug #4815]
-
-Fri Jun  3 21:48:12 2011  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* lib/rubygems/test_case.rb: Refix for test-all in separate directory.
-	  r31147 + r31151.
-
-Fri Jun  3 20:58:47 2011  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* ext/date/date_core.c (d_lite_plus): get rid of compiler warnings.
-
-Fri Jun  3 20:56:40 2011  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* include/ruby/missing.h, numeric.c (round): moved prototype of round()
-	  from numeric.c to missing.h.  (note: round() is C99 feature, so ruby
-	  provides it if not exist in C runtime.)
-
-Fri Jun  3 20:42:04 2011  Shota Fukumori  <sorah@tubusu.net>
-
-	* lib/test/unit/parallel.rb: Keep $stdin, $stdout before run testcase
-	  and restore after run. Because some test break $stdin, $stdout.
-	  Fixes [Bug #4433] [ruby-core:35353]
-
-Fri Jun  3 19:58:14 2011  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* io.c (io_fflush): windows -- call fsync() only when the FD is tied to
-	  file, because if the FD is pipe, it blocks.
-
-Fri Jun  3 09:27:31 2011  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* lib/net/http.rb (URI::HTTP#request_uri): return nil when the uri
-	  is path-rootless form. Bug #4759
-
-Thu Jun  2 23:51:03 2011  James Edward Gray II  <jeg2@ruby-lang.org>
-
-	* lib/csv.rb: Improve the line ending detection algorithm
-	  patch by Alexey).
-
-Thu Jun  2 20:05:57 2011  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* io.c (rb_io_s_write, rb_io_s_binwrite): return!!!
-
-Thu Jun  2 16:29:34 2011  Shota Fukumori  <sorah@tubusu.net>
-
-	* io.c: Add File.write, File.binwrite. [Feature #1081] [ruby-core:21701]
-
-	* test/ruby/test_io.rb: Test for File.write, File.binwrite.
-
-	* NEWS: News for above.
-
-Thu Jun  2 12:33:09 2011  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* io.c (io_fflush, rb_io_flush): need to fsync() when ruby calls
-	  internal flush. [ruby-core:36670] [Bug #4813]
-
-Thu Jun  2 07:56:24 2011  Hidetoshi NAGAI  <nagai@ai.kyutech.ac.jp>
-
-	* ext/tk/tcltklib.c: reduce CPU power required by an eventloop.
-
-Tue May 31 21:28:33 2011  Tanaka Akira  <akr@fsij.org>
-
-	* test/ruby/test_signal.rb (TestSignal#test_signal_requiring):
-	  redirect stderr to null device.
-
-Thu Jun  2 00:45:26 2011  Hidetoshi NAGAI  <nagai@ai.kyutech.ac.jp>
-
-	* ext/tk/extconf.rb: fix for uninitialized global variables.
-	  [Ruby 1.9 - Bug #4811]
-
-Wed Jun  1 21:57:08 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* thread_pthread.c (native_sleep): fix 1000times calculation error.
-	  this is a regression since r31457. [Bug #4808] [ruby-dev:43606]
-
-Wed Jun  1 17:19:16 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* thread_pthread.c: remove unused macro.
-
-Wed Jun  1 15:42:18 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* parse.y (peek_n): new macro to see next nth char.
-
-Wed Jun  1 15:40:46 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* tool/rbinstall.rb (gem): fix for rubygems change.
-
-Wed Jun  1 14:07:57 2011  Ryan Davis  <ryand-ruby@zenspider.com>
-
-	* lib/minitest/*: Imported minitest 2.2.2 (r6281)
-	* test/minitest/*: ditto
-
-Wed Jun  1 12:35:50 2011  Ryan Davis  <ryand-ruby@zenspider.com>
-
-	* lib/rubygems*: Import rubygems 1.8.5 (released @ 137c80f)
-	* test/rubygems: Ditto
-
-Wed Jun  1 12:34:00 2011  Kenta Murata  <mrkn@mrkn.jp>
-
-	* NEWS: add new features of bigdecimal.
-
-Wed Jun  1 09:41:14 2011  Eric Hodel  <drbrain@segment7.net>
-
-	* lib/cgi/util.rb:  Improve documentation.  Patch by Kuba Fietkiewicz.
-	  [Ruby 1.9 - Bug #4775]
-	* lib/cgi/core.rb:  ditto
-
-Wed Jun  1 09:26:05 2011  Eric Hodel  <drbrain@segment7.net>
-
-	* lib/mathn.rb:  Improve documentation and attach it to Numeric.
-	  Modified from patch by Anil V.  [Ruby 1.9 - Bug #4762]
-
-Wed Jun  1 09:21:30 2011  Eric Hodel  <drbrain@segment7.net>
-
-	* lib/prime.rb:  Indent examples enough to appear as code sections.
-	  Note that Prime is Enumerable.  [#4762]
-
-Wed Jun  1 07:34:57 2011  Eric Hodel  <drbrain@segment7.net>
-
-	* hash.c (key_i):  Change rdoc from "the first occurrence" to "an
-	  occurrence" since first occurrence is not a specification of
-	  Hash#key.  [Ruby 1.9 - Bug #4760]
-
-Wed Jun  1 07:26:19 2011  Eric Hodel  <drbrain@segment7.net>
-
-	* ext/pty/pty.c (pty_check):  Restore "not reached" comment.
-	  [Ruby 1.9 - Bug #4756]
-
-Wed Jun  1 07:21:40 2011  Eric Hodel  <drbrain@segment7.net>
-
-	* ext/zlib/zlib.c:  Fix document-method declarations for set_sync and
-	  set_comment.  [Ruby 1.9 - Bug #4695]
-
-Wed Jun  1 06:43:13 2011  Masaya Tarui  <tarui@ruby-lang.org>
-
-	* load.c (loaded_feature_path): cut nonsense loop execution to fix
-	  performance bug.
-
-Wed Jun  1 01:16:02 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* class.c (rb_mix_module): implement Module#mix.
-
-Wed Jun  1 01:15:12 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* io.c (io_encoding_set): should honor already set ecflags since it
-	  might be set by mode option.  fixed #4804
-
-Wed Jun  1 00:34:04 2011  CHIKANAGA Tomoyuki  <nagachika00@gmail.com>
-
-	* ext/bigdecimal/bigdecimal.c (GetVpValueWithPrec): remove unused
-	  variable.
-
-Wed Jun  1 00:32:00 2011  Kenta Murata  <mrkn@mrkn.jp>
-
-	* ext/bigdecimal/bigdecimal.c (GetVpValueWithPrec): support instantiation from
-	  a Float through Rational.
-
-	* ext/bigdecimal/bigdecimal.c (BigDecimal_new): ditto.
-
-	* test/bigdecimal/test_bigdecimal.rb (test_global_new_float): add a test for
-	  the above changes.
-
-	* test/bigdecimal/test_bigdecimal.rb (test_new_with_float): ditto.
-
-Wed Jun  1 00:07:00 2011  Kenta Murata  <mrkn@mrkn.jp>
-
-	* ext/bigdecimal/bigdecimal.c (BigDecimal_coerce): support coerce with a
-	  Rational.  The precision used for instantiate a BigDecimal from the
-	  given Rational is obtained from the receiver BigDecimal.
-
-	* test/bigdecimal/test_bigdecimal.rb (test_coerce): add a test for the
-	  above change.
-
-Tue May 31 23:49:08 2011  Tadayoshi Funaba  <tadf@dotrb.org>
-
-	* ext/date/date_core.c (offset_to_sec): fixed invalid validation.
-
-Tue May 31 23:43:00 2011  Kenta Murata  <mrkn@mrkn.jp>
-
-	* ext/bigdecimal/bigdecimal.c (GetVpValueWithPrec): replace the algorithm for
-	  coercing from a Rational to stop requiring "bigdecimal/util.rb".
-	  [ruby-core:34318]
-
-	* ext/bigdecimal/bigdecimal.c (GetVpValue): refactoring.
-
-	* ext/bigdecimal/bigdecimal.c (BigDecimal_new): support instantiation from a
-	  Rational.
-
-	* test/bigdecimal/test_bigdecimal.rb (test_global_new_with_rational): add a
-	  test for the above change.
-
-	* test/bigdecimal/test_bigdecimal.rb (test_new_with_rational): ditto.
-
-Tue May 31 22:44:00 2011  Kenta Murata  <mrkn@mrkn.jp>
-
-	* ext/bigdecimal/bigdecimal.c (BigDecimal_new): support instantiation a
-	  BigDecimal object from an Integer.
-
-	* test/bigdecimal/test_bigdecimal.rb (test_new_with_integer):
-	  add for testing the above change.
-
-	* ext/bigdecimal/bigdecimal.c (BigDecimal_global_new): replace its body
-	  with a BigDecimal_new call.
-
-	* test/bigdecimal/test_bigdecimal.rb (test_global_new_with_integer):
-	  add for testing the above change.
-
-Tue May 31 22:24:39 2011  Tadayoshi Funaba  <tadf@dotrb.org>
-
-	* ext/date/date_core.c: use simple/complex mode instead of light/right mode.
-	* test/date/*.rb: followed the above changes.
-
-Tue May 31 21:28:33 2011  Tanaka Akira  <akr@fsij.org>
-
-	* test/ruby/test_signal.rb (TestSignal#test_signal_requiring):
-	  initialize SIGINT handler.
-
-Tue May 31 17:03:24 2011  Hiroshi Nakamura  <nahi@ruby-lang.org>
-
-	* lib/net/http.rb, lib/net/protocol.rb: Allow to configure to wait
-	  server returning '100 continue' response before sending HTTP request
-	  body. See NEWS for more detail. See #3622.
-	  Original patch is made by Eric Hodel <drbrain@segment7.net>.
-
-	* test/net/http/test_http.rb: test it.
-
-	* NEWS: Add new feature.
-
-Tue May 31 14:17:49 2011  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* io.c (rb_io_s_pipe): potential bug. the mode of read IO is set as
-	  DEFAULT_TEXTMODE in call of io_set_encoding(), and of write IO is
-	  also set as it in call of io_new_instance() via rb_protect().
-	  so, if DEFAULT_TEXTMODE is not 0, we should check the result of
-	  extract_binmode() and avoid crush of default IO mode and the result.
-
-Tue May 31 13:00:17 2011  Yuki Sonoda (Yugui)  <yugui@yugui.jp>
-
-	* strftime.c (rb_strftime_with_timespec): improved style consistency.
-	  constified some variables.
-
-	* test/test_time.rb (TestTime#test_huge_precision): test for #4456.
-
-Tue May 31 12:53:10 2011  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* test/io/wait/test_io_wait.rb (TestIOWait#{test_nread,test_ready?,
-	  test_wait}: give system some time to process the written data.
-
-Tue May 31 12:40:49 2011  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* test/ruby/test_io.rb (TestIO#test_open_mode): MUST release resources
-	  explicitly. fix problem of r31671
-
-Tue May 31 10:49:55 2011  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* vm_exec.c: remove conditions for clang
-	  because clang version 3.0 (trunk 132165) doesn't need them.
-
-Mon May 30 22:19:33 2011  Tanaka Akira  <akr@fsij.org>
-
-	* test/ruby/test_signal.rb (TestSignal#test_signal_requiring): don't
-	  close stderr.
-
-Mon May 30 20:22:00 2011  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* test/ruby/test_signal.rb (TestSignal#test_signal_requiring): small
-	  but critical typo of r31642.  sorry...
-	  [Bug #4798] [ruby-core:36550]
-
-Mon May 30 15:44:16 2011  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* insns.def (opt_mult): as r31805, volatile it.
-	  Without this, clang -O fails calculation.
-
-	* numeric.c (fix_mul): ditto.
-
-	* rational.c (f_imul): ditto.
-
-Mon May 30 10:26:51 2011  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* numeric.c (int_pow): make sure to assign the result of x * z.
-	  If xz is optimized out, the value won't overflow.
-
-Sun May 29 23:17:29 2011  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* re.c (rb_reg_match): fix rdoc of Regexp#=~.
-	  patched by Tsuyoshi Sawada. [Bug #4781]
-
-Sun May 29 23:10:42 2011  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* lib/webrick/https.rb (WEBrick::HTTPRequest#parse_uri):
-	  keep parse_uri as private. patched by okkez. [Bug #4773]
-
-Sun May 29 17:53:03 2011  CHIKANAGA Tomoyuki  <nagachika00@gmail.com>
-
-	* numeric.c: add #include "internal.h" for rb_big_uminus() prototype.
-
-Sun May 29 15:09:05 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* numeric.c (flo_round): fix for negative value.
-
-Sun May 29 02:16:53 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* test/net/http/utils.rb (TestNetHTTPUtils#teardown): add nil check.
-
-Sun May 29 00:22:40 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* process.c (before_exec, after_exec): change from macro to function.
-
-Sat May 28 19:30:17 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* process.c (before_exec, after_exec): change SIGPIPE handler to SIG_DFL
-	  before calling execve(). Because r31760 reintroduced an issue that
-	  system() may hang up (i.e. [ruby-dev:12261]).
-	* process.c (save_sigpipe, restore_sigpipe): new.
-
-Sat May 28 16:08:16 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* signal.c (Init_signal, default_handler): change default SIGPIPE handler
-	  from empty function to SIG_IGN. [ruby-dev:43215]
-	* signal.c (sigpipe): removed.
-
-Sat May 28 03:04:27 2011  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* io.c (fill_cbuf): return MORE_CHAR_SUSPENDED when cbuf is not empty.
-
-Sat May 28 02:22:48 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* string.c (rb_str_bytesize): rb_str_bytesize() should use LONG2NUM().
-	  Patch by Nikolai Weibull. [Bug #4789] [ruby-core:36511]
-
-Sat May 28 02:06:26 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* io.c (fill_cbuf): Fix test-all crash.
-
-Sat May 28 00:58:40 2011  Marc-Andre Lafortune  <ruby-core@marc-andre.ca>
-
-	* lib/ostruct.rb (method_missing): Handle [] and []= correctly.
-	  Based on a patch by Caius Durling, bug #4179 [ruby-core:33792]
-
-Fri May 27 23:56:54 2011  Kouhei Sutou  <kou@cozmixng.org>
-
-	* test/rexml/test_core.rb (Tester::test_text_frozen): split frozen
-	  string test. refs #4783
-
-Fri May 27 22:46:23 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* tool/rbinstall.rb (gem): install gemspec of json.  fixed #4784
-
-Fri May 27 22:45:10 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* io.c (validate_enc_binmode): do not clear textmode flag if
-	  default.  fixed #4732
-
-	* io.c (fill_cbuf): finish reading at EOF.
-
-Fri May 27 11:31:51 2011  misfo <tedwardo2@gmail.com>
-
-	* lib/rexml/text.rb (REXML::Text#initialize): prevent an error
-	  when passing a frozen string to REXML::Text.new
-
-	  dup the string passed in instead of cloning so that it's frozen
-	  state is ignored
-
-Fri May 27 08:47:26 2011  Hidetoshi NAGAI  <nagai@ai.kyutech.ac.jp>
-
-	* thread.c (ppoll): typo bug fix.
-
-Fri May 27 08:35:04 2011  Hidetoshi NAGAI  <nagai@ai.kyutech.ac.jp>
-
-	* ext/tk/lib/tk.rb: hang-up at exit before calling Tk.mainloop.
-
-	* ext/tk/lib/tk/extconf.rb: cannot make on MinGW [Ruby 1.9 - Bug #4141].
-
-Thu May 27 00:34:07 2011  James Edward Gray II  <jeg2@ruby-lang.org>
-
-    * lib/csv.rb: Enhance each() to support Enumerator.
-
-Thu May 26 10:32:11 2011  James Edward Gray II  <jeg2@ruby-lang.org>
-
-    * lib/csv.rb: Documentation improvements from Ysiad Ferreiras.
-      [Ruby 1.9 - Bug #4785]
-
-Thu May 26 15:42:02 2011  Cezary Baginski <cezary.baginski@gmail.com>
-
-	* lib/xmlrpc/parser.rb (FaultException): fix to_s and inspect
-
-	* test/xmlrpc/parser.rb: test for the above
-
-Wed May 25 11:54:31 2011  Eric Hodel  <drbrain@segment7.net>
-
-	* ext/curses/curses.c:  Remove color constants block.
-	  [Ruby 1.9 - Bug #4748]
-
-Wed May 25 09:56:45 2011  Eric Hodel  <drbrain@segment7.net>
-
-	* ext/curses/curses.c:  Add missing documentation for button state, MIN
-	  and MAX comments.  Add Curses. to TABSIZE= and ESCDELAY= methods.
-	  [Ruby 1.9 - Bug #4747]
-
-Wed May 25 09:35:31 2011  Eric Hodel  <drbrain@segment7.net>
-
-	* lib/benchmark.rb:  Restore nodoc for Benchmark::Job and
-	  Benchmark::Report.  [Ruby 1.9 - Bug #4726]
-
-Wed May 25 09:29:38 2011  Eric Hodel  <drbrain@segment7.net>
-
-	* lib/net/pop.rb:  Hide implementation details from RDoc.
-	  [Ruby 1.9 - Bug #4711]
-
-Wed May 25 09:26:29 2011  Eric Hodel  <drbrain@segment7.net>
-
-	* lib/net/ftp.rb:  Add :nodoc: for private methods.
-	  [Ruby 1.9 - Bug #4710]
-
-Wed May 25 09:19:17 2011  Eric Hodel  <drbrain@segment7.net>
-
-	* ext/zlib/zlib.c:  Fix Document-method declarations.  Improve
-	  Zlib::GzipFile's method catalog.  [Ruby 1.9 - Bug #4695]
-
-Wed May 25 08:22:12 2011  Eric Hodel  <drbrain@segment7.net>
-
-	* lib/erb.rb:  Hide documentation for implementation details of ERB.
-	  [Ruby 1.9 - Bug #4694]
-
-Wed May 25 07:58:14 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* lib/tempfile.rb (Tempfile.{mkdir,rmdir}): revert for backward
-	  compatibility.
-
-Wed May 25 07:13:12 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* spec/README: update the description.
-
-Wed May 25 07:12:16 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* lib/tempfile.rb (Tempfile.{lock,unlock}_tempfile): refactor.
-
-Tue May 24 17:30:36 2011  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* spec/README: fix typo.
-	  patched by bowsersenior. https://github.com/ruby/ruby/pull/24
-
-Tue May 24 07:06:34 2011  Hidetoshi NAGAI  <nagai@ai.kyutech.ac.jp>
-
-	* ext/tk/lib/tk.rb: fail to start Tk.mainloop (exit immediately) on
-	  some environment (reported on [ruby-talk:381444]).
-
-	* ext/tk/lib/tk/canvas.rb: support creating a canvas item object from
-	  an item ID number.
-
-	* ext/tk/lib/tk/image.rb: import documents which are pull-requested.
-	  [Ruby 1.9 - Feature #4595]
-
-	* ext/tk/lib/tk/extconf.rb: search directories for 64bit library (e.g.
-	  /usr/lib64), add some new configure options (see README.tcltklib),
-	  and bug fix.
-
-	* ext/tk/lib/tk/README.tcltklib: modify docs for some new configure
-	  options.
-
-Tue May 24 04:01:46 2011  Aaron Patterson <aaron@tenderlovemaking.com>
-
-	* lib/yaml.rb: switch default YAML engine to Psych, old syck engine
-	  may be enabled via YAML::ENGINE.yamler = "syck". [ruby-core:36374]
-
-Mon May 23 09:45:26 2011  Hiroshi Nakamura  <nahi@ruby-lang.org>
-
-	* include/ruby/defines.h (CASEFOLD_FILESYSTEM): Revert r30508. Forgot to
-	  include this file in the commit r31692. __APPLE__ is not
-	  CASEFOLD_FILESYSTEM again, from this time.
-
-Mon May 23 10:01:02 2011  Martin Bosslet  <Martin.Bosslet@googlemail.com>
-
-	* ext/openssl/ossl_asn1.c: Do not parse zero-tagged values as EOC. Do
-	  not let current length become negative for infinite length constructed
-	  values. Support constructed values of length zero. Added tests.
-
-Mon May 23 09:19:53 2011  Eric Hodel  <drbrain@segment7.net>
-
-	* lib/net/smtp.rb:  Document Net::SMTP::Response.  Patch by J.R. Garcia.
-	  [Ruby 1.9 - Bug #4768]
-
-Mon May 23 09:03:52 2011  Shota Fukumori  <sorah@tubusu.net>
-
-	* lib/test/unit/parallel.rb: Never Ignore SIGINT. When received
-	Interrupt, immediately puts result and exit. [ruby-dev:43571]
-
-	* lib/test/unit.rb: When received Interrupt, wait results from workers
-	and collect them. [ruby-dev:43571]
-
-Mon May 23 09:08:07 2011  Eric Hodel  <drbrain@segment7.net>
-
-	* lib/mathn.rb:  Improve documentation.  Patch by Sandor Szucs.
-	  [Ruby 1.9 - Bug #4767]
-
-Mon May 23 08:45:55 2011  Eric Hodel  <drbrain@segment7.net>
-
-	* lib/ostruct.rb:  Improve documentation.  Patch by Franklin Webber.
-	  [Ruby 1.9 - Bug #4761]
-
-Mon May 23 08:35:24 2011  Eric Hodel  <drbrain@segment7.net>
-
-	* hash.c:  Improve documentation of Hash#key.  Patch by Utkarsh
-	  Kukreti.  [Ruby 1.9 - Bug #4760]
-
-Mon May 23 08:32:59 2011  Eric Hodel  <drbrain@segment7.net>
-
-	* enumerator.c:  Improve documentation.  Patch by Dave Copeland.
-	  [Ruby 1.9 - Bug #4757]
-
-Mon May 23 07:19:45 2011  Martin Bosslet  <Martin.Bosslet@googlemail.com>
-
-	* NEWS (openssl): Infinite length support. Different behavior of
-	  Constructive and Primitive constructors.
-
-Mon May 23 06:58:33 2011  Martin Bosslet  <Martin.Bosslet@googlemail.com>
-
-	* ext/openssl/ossl_asn1.c: Forbid Constructives whose value is not an
-	  Array to prevent segfault. Added test.
-
-Mon May 23 06:33:17 2011  Martin Bosslet  <Martin.Bosslet@googlemail.com>
-
-	* ext/openssl/ossl_asn1.c: Forbid Constructive without infinite
-	  length. This also prevents a segfault. Added test and improved
-	  documentation.
-
-Mon May 23 05:58:14 2011  Martin Bosslet  <Martin.Bosslet@googlemail.com>
-
-	* ext/openssl/ossl_asn1.c: Fix decoding of infinite length values.
-	  Simplified ossl_asn1_decode0 by splitting it into three separate
-	  functions. Add tests.
-	  [Ruby 1.9 - Bug #4374][ruby-core:35123]
-
-Mon May 23 04:03:46 2011  Martin Bosslet  <Martin.Bosslet@googlemail.com>
-
-	* ext/openssl/ossl_asn1.c (ossl_asn1_initialize): Allow creation of
-	  Constructives with an explicit tag_class parameter without
-	  automatically setting tagging to :EXPLICIT. Fixes a bug when encoding
-	  infinite length primitive values.
-
-Mon May 23 04:03:46 2011  Martin Bosslet  <Martin.Bosslet@googlemail.com>
-
-	* ext/openssl/ossl_asn1.c (ossl_asn1_cons_to_der): Add an additional
-	  EOC for infinite length Constructives that are supposed to be encoded
-	  with explicit tagging. Also tabify method correctly.
-
-Mon May 23 03:44:39 2011  Martin Bosslet  <Martin.Bosslet@googlemail.com>
-
-	* ext/openssl/ossl_asn1.c (ossl_asn1data_to_der): Remove redundant
-	  flag tmp_cons.
-
-Mon May 23 00:35:00 2001  Kenta Murata  <mrkn@mrkn.jp>
-
-	* bignum.c (dump_bignum, bigmul1_balance, big_split, biglsh_bang),
-	  (bigrsh_bang, big_split3, bigmul1_toom3, bigmul0): implement Toom3 (Toom-Cook)
-	  multiplication.
-
-	* include/ruby/defines.h: add format prefixes for BDIGIT and BDIGIT_DBL.
-
-Sun May 22 23:24:02 2011  Martin Bosslet  <Martin.Bosslet@googlemail.com>
-
-	* ext/openssl/ossl_asn1.c: Instead of rb_intern use static symbols to
-	  improve performance.
-
-Sun May 22 21:56:51 2011  Martin Bosslet  <Martin.Bosslet@googlemail.com>
-
-	* ext/openssl/ossl_asn1.c: Use OpenSSL constants V_ASN1_xxx instead of
-	  hardcoded numbers for initializing class_tag_map.
-
-Sun May 22 21:29:29 2011  Hiroshi Nakamura  <nahi@ruby-lang.org>
-
-	* include/ruby/defines.h (CASEFOLD_FILESYSTEM): Revert r30508. See #4255.
-	  Now __APPLE__ is not CASEFOLD_FILESYSTEM again.
-
-	* load.c (loaded_feature_path, rb_feature_p, load_lock): Revert r30508.
-	  See #4255. Make $LOADED_FEATURES scanning case-sensitive again.
-
-Sun May 22 18:59:27 2011  Hiroshi Nakamura  <nahi@ruby-lang.org>
-
-	* ext/openssl/ossl_asn1.c(ossl_asn1_default_tag): avoid using RCLASS_SUPER
-	  to make it compilable. Plus, tabify and change variable definition style.
-
-Sun May 22 18:26:43 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* gc.c (vm_xcalloc): use calloc provided by platforms.
-	  fixes #4754
-
-Sun May 22 11:44:53 2011  Eric Hodel  <drbrain@segment7.net>
-
-	* ext/pty/pty.c:  Improve documentation.  Patch by David Copeland.
-	  [Ruby 1.9 - Bug #4756]
-
-Sun May 22 11:26:39 2011  Eric Hodel  <drbrain@segment7.net>
-
-	* lib/timeout.rb:  Improve documentation.  Patch by David Copeland.
-	  [Ruby 1.9 - Bug #4755]
-
-Sun May 22 11:21:41 2011  Eric Hodel  <drbrain@segment7.net>
-
-	* lib/ipaddr.rb:  Improve documentation.  Patch by Sandor Szucs.
-	  [Ruby 1.9 - Bug #4753]
-
-Sun May 22 11:14:40 2011  Eric Hodel  <drbrain@segment7.net>
-
-	* lib/forwardable.rb:  Document def_delegator.  Patch by Sandor Szucs.
-	  [Ruby 1.9 - Bug #4752]
-
-Sun May 22 11:11:41 2011  Eric Hodel  <drbrain@segment7.net>
-
-	* lib/fileutils.rb:  Document block behavior of FileUtils.cd.  Patch by
-	  Bil Kleb.  [Ruby 1.9 - Bug #4751]
-
-Sun May 22 11:07:47 2011  Eric Hodel  <drbrain@segment7.net>
-
-	* ext/curses/curses.c:  Complete documentation.  Patch by Vincent
-	  Batts.  [Ruby 1.9 - Bug #4748]
-
-Sun May 22 09:29:43 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* test/ruby/test_rubyoptions.rb (TestRubyOptions#test_set_program_name):
-	  use spawn. it prevent that other tests inherit renamed $0.
-
-Sun May 22 08:57:13 2011  Martin Bosslet  <Martin.Bosslet@googlemail.com>
-
-	* ext/openssl/ossl_asn1.c: Default tag lookup in constant time via hash
-	  instead of previous linear algorithm.
-	  [Ruby 1.9 - Feature #4309][ruby-core:34813]
-
-Sun May 22 07:54:16 2011  Martin Bosslet  <Martin.Bosslet@googlemail.com>
-
-	* ext/openssl/ossl_digest.c: Explain DSS and DSS1 in documentation.
-
-Sun May 22 07:10:25 2011  Martin Bosslet  <Martin.Bosslet@googlemail.com>
-
-	* test/openssl/test_pkey_dsa.rb: Add tests for sign/verify.
-
-Sun May 22 06:07:17 2011  Martin Bosslet  <Martin.Bosslet@googlemail.com>
-
-	* test/openssl/test_x509cert.rb: Merge DSA-related tests from ruby_1_8
-	  branch.
-
-Sun May 22 04:11:12 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* thread.c (Init_Thread): add a code comment why the meaningless
-	  line is necessary.
-
-Sun May 22 01:35:12 2011  Tadayoshi Funaba  <tadf@dotrb.org>
-
-	* ext/date/date_core.c: modified documentation.
-
-Sat May 21 22:46:26 2011  Tadayoshi Funaba  <tadf@dotrb.org>
-
-	* ext/date/date_strftime(date_strftime_with_tmx): "%v" means "%e-%b-%Y".
-
-Sat May 21 22:14:35 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* io.c (rb_io_extract_modeenc): accept combination hash and
-	  File::Constants. (eg. File.open('yo', :mode => File::WRONLY))
-	  [Feature #4742][ruby-core:36338]
-	* test/ruby/test_io.rb (TestIO#test_open_mode): new test.
-
-Sat May 21 21:44:14 2011  Tadayoshi Funaba  <tadf@dotrb.org>
-
-	* test/date/test_switch_hitter.rb: new.
-
-Sat May 21 21:18:29 2011  Tadayoshi Funaba  <tadf@dotrb.org>
-
-	* ext/date/date_{core,parse}.c: moved nearly all core code from ext/date/lib.
-	* ext/date/lib/{date,date/format}.rb: removed nearly all code.
-
-Sat May 21 02:58:46 2011  Eric Hodel  <drbrain@segment7.net>
-
-	* ext/.document:  Add curses to documented extensions.
-	* ext/curses/curses.c:  Improve documentation.  Patch by Vincent Batts.
-	  [Ruby 1.9 - Bug #4747]
-
-Sat May 21 02:51:01 2011  Eric Hodel  <drbrain@segment7.net>
-
-	* ext/bigdecimal/lib/bigdecimal/util.rb:  Improve documentation.  Patch
-	  by Pete Higgins.  [Ruby 1.9 - Bug #4746]
-
-Sat May 21 02:44:10 2011  Eric Hodel  <drbrain@segment7.net>
-
-	* ext/bigdecimal/lib/bigdecimal/jacobian.rb:  Document isEqual.  Patch
-	  by Kuba Fietkiewicz.  [Ruby 1.9 - Bug #4744]
-
-Sat May 21 02:22:34 2011  Eric Hodel  <drbrain@segment7.net>
-
-	* ext/date/lib/date/format.rb:  Document date formats.  Patch by
-	  Clinton Nixon.  [Ruby 1.9 - Bug #4743]
-
-Fri May 20 05:15:19 2011  Nobuhiro Iwamatsu  <iwamatsu@nigauri.org>
-
-	* gc.c: Fix build on m68k by 'error: too few arguments to
-	  function 'mark_locations_array''.
-
-Fri May 20 04:23:42 2011  Eric Hodel  <drbrain@segment7.net>
-
-	* lib/scanf.rb:  Improve documentation.  Patch by Gabe McArthur.
-	  [Ruby 1.9 - Bug #4735]
-
-Fri May 20 00:58:01 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* enc/trans/ibm737-tbl.rb: greek code page.  fixes #4738
-
-Thu May 19 14:44:05 2011  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* test/ruby/test_signal.rb (test_signal_requiring): skip on Windows.
-	  we can send SIGINT only to pid 0 and the process itself.
-
-Thu May 19 09:07:08 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* lib: revert r31635-r31638 and untabify with expand(1).
-
-Thu May 19 07:47:26 2011  Martin Bosslet  <Martin.Bosslet@googlemail.com>
-
-	* test/openssl/test_pkey_rsa.rb: Add tests for sign/verify.
-
-Thu May 19 07:19:16 2011  Martin Bosslet  <Martin.Bosslet@googlemail.com>
-
-	* ext/openssl/ossl_pkey.c: Add documentation.
-
-Thu May 19 07:06:56 2011  Eric Hodel  <drbrain@segment7.net>
-
-	* lib/benchmark.rb:  Fix indentation.
-	* lib/net/imap.rb:  Fix indentation of regular expressions.
-
-Thu May 19 06:36:11 2011  Eric Hodel  <drbrain@segment7.net>
-
-	* lib/net/imap.rb:  Fix indentation of EOF for heredoc.
-	* lib/debug.rb (Commands):  Fix indentation of EOHELP for heredoc.
-
-Thu May 19 06:30:38 2011  Eric Hodel  <drbrain@segment7.net>
-
-	* lib/mkmf.rb:  Fix indentation of EOM for heredoc.
-
-Thu May 19 06:16:41 2011  Eric Hodel  <drbrain@segment7.net>
-
-	* lib:  Convert tabs to spaces for ruby files per
-	  https://bugs.ruby-lang.org/projects/ruby/wiki/DeveloperHowto#coding-style
-	  Patch by Steve Klabnik [Ruby 1.9 - Bug #4730]
-	  Patch by Jason Dew [Ruby 1.9 - Feature #4718]
-
-Thu May 19 06:06:07 2011  Eric Hodel  <drbrain@segment7.net>
-
-	* lib/cgi/util.rb:  Improve documentation.  Patch by Clinton Nixon.
-	  [Ruby 1.9 - Bug #4733]
-	* lib/cgi/core.rb:  ditto
-	* lib/cgi/cookie.rb:  ditto
-
-Thu May 19 06:02:21 2011  Eric Hodel  <drbrain@segment7.net>
-
-	* lib/tempfile.rb:  Document Dir.mkdir and Dir.rmdir.  Patch by Clinton
-	  Nixon.  [Ruby 1.9 - Bug #4728]
-
-Thu May 19 05:57:52 2011  Eric Hodel  <drbrain@segment7.net>
-
-	* encoding.c:  Improve documentation for Encoding#default_external and
-	  Encoding#default_internal.
-
-Wed May 18 22:45:26 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* ext/io/console/lib/console/size.rb (IO#console_size): new
-	  method.  (EXPERIMENTAL)
-
-Wed May 18 22:41:51 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* internal.h: add for internal use only.
-
-Wed May 18 22:36:43 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* eval.c (setup_exception): internal exception should be hidden
-
-Wed May 18 20:25:04 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* lib/timeout.rb (Timeout#timeout): don't leak "execution expired"
-	  exception. [Bug #4283] [ruby-core:34534].
-
-Wed May 18 06:09:24 2011  Eric Hodel  <drbrain@segment7.net>
-
-	* lib/cmath.rb:  Add some examples and improve documentation.  Patch by
-	  Sandor Szucs.  [Ruby 1.9 - Bug #4727]
-
-Wed May 18 05:40:31 2011  Eric Hodel  <drbrain@segment7.net>
-
-	* lib/benchmark.rb:  Remove nodoc from Benchmark::Job and
-	  Benchmark::Report.  Patch by Sandor Szucs.  [Ruby 1.9 - Bug #4726]
-
-Wed May 18 05:29:26 2011  Eric Hodel  <drbrain@segment7.net>
-
-	* lib/webrick/compat.rb:  Improve documentation.  Patch by Sandor
-	  Szucs.  [Ruby 1.9 - Bug #4725]
-
-Wed May 18 05:10:35 2011  Eric Hodel  <drbrain@segment7.net>
-
-	* lib/tracer.rb:  Improve documentation.  Patch by Richard Ramsden.
-	  [Ruby 1.9 - Feature #4720]
-
-Wed May 18 04:53:41 2011  Eric Hodel  <drbrain@segment7.net>
-
-	* lib/cmath.rb:  Improve documentation.  Patch by Jason Dew.
-	  [Ruby 1.9 - Feature #4717]
-
-Wed May 18 04:50:24 2011  Eric Hodel  <drbrain@segment7.net>
-
-	* lib/net/ftp.rb:  Improve documentation.  Patch by Vincent Batts.
-	  [Ruby 1.9 - Bug #4710]
-
-Wed May 18 03:14:49 2011  Eric Hodel  <drbrain@segment7.net>
-
-	* test/test_singleton.rb:  Add tests from lib/singleton.rb.  Patch by
-	  Pete Higgins.  [Ruby 1.9 - Bug #4715]
-
-Wed May 18 03:03:07 2011  Eric Hodel  <drbrain@segment7.net>
-
-	* lib/singleton.rb:  Improve documentation.  Patch by Pete Higgins.
-	  [Ruby 1.9 - Bug #4709]
-
-Tue May 17 21:24:04 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* thread.c (rb_mutex_lock): remove remove_signal_thread_list() call.
-	  It's meaningless because lock_interrupt doesn't call
-	  add_signal_thread_list().
-
-Tue May 17 20:20:49 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* vm_core.h (rb_thread_struct): add volatile to
-	  transition_for_lock because it is not protected by lock.
-
-Tue May 17 20:08:53 2011  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* LEGAL (missing/{elf,tgamma,lgamma_r}.c): they've been replaced by
-	  public domain implementations.
-
-	* LEGAL (vsnprintf.c): it has moved to srcdir from missing/.
-
-	* LEGAL (missing/crypt.c): list its original license.
-
-Tue May 17 19:54:26 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* LEGAL (configure): add missing/setproctitle.c
-
-Tue May 17 19:35:01 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-	Fix FreeBSD test failure.
-
-	* test/ruby/test_rubyoptions.rb (TestRubyOptions#test_set_program_name):
-	  use ps -o command instead of ps -o cmd. FreeBSD doesn't support
-	  -o cmd option.
-
-Tue May 17 08:04:26 2011  Martin Bosslet  <Martin.Bosslet@googlemail.com>
-
-	* ext/openssl/ossl_digest.c: Add documentation.
-
-Tue May 17 07:14:58 2011  Eric Hodel  <drbrain@segment7.net>
-
-	* lib/net/http.rb:  Improve documentation of proxy configuration
-	  methods.  Patch by Alf Mikula.  [Ruby 1.9 - Bug #4714]
-
-Tue May 17 07:09:01 2011  Eric Hodel  <drbrain@segment7.net>
-
-	* lib/net/pop.rb:  Improve documentation.  Patch by Vincent Batts.
-	  [Ruby 1.9 - Bug #4711]
-	* lib/net/telnet.rb:  ditto
-
-Tue May 17 07:00:41 2011  Eric Hodel  <drbrain@segment7.net>
-
-	* lib/net/http.rb:  Fix nodoc for Net::HTTP::version_1_1?.  Patch by
-	  Alf Mikula.  [Ruby 1.9 - Bug #4713]
-
-Tue May 17 06:56:26 2011  Eric Hodel  <drbrain@segment7.net>
-
-	* lib/optparse.rb:  Add link to make_switch to improve documentation.
-	  Patch by David Copeland.  [Ruby 1.9 - Bug #4708]
-
-Tue May 17 06:50:40 2011  Eric Hodel  <drbrain@segment7.net>
-
-	* lib/observer.rb:  Improve documentation.  Patch by David Copeland.
-	  [Ruby 1.9 - Bug #4707]
-
-Tue May 17 06:42:53 2011  Eric Hodel  <drbrain@segment7.net>
-
-	* lib/logger.rb:  Improve documentation.  Patch by David Copeland.
-	  [Ruby 1.9 - Bug #4706]
-
-Tue May 17 06:28:14 2011  Eric Hodel  <drbrain@segment7.net>
-
-	* lib/gserver.rb:  Improve documentation.  Patch by David Copeland.
-	  [Ruby 1.9 - Bug #4705]
-
-Tue May 17 06:21:15 2011  Eric Hodel  <drbrain@segment7.net>
-
-	* lib/cgi.rb: Add toplevel documentation to class CGI
-	* lib/cgi/session.rb: Add overview documentation to CGI::Cookie
-	* lib/cgi/html.rb:  Don't add CGI::TagMaker documentation to CGI.
-	  Patch by David Copeland.  [Ruby 1.9 - Bug #4704]
-	* lib/cgi/core.rb:  Clean up CGI documentation.  Patch by David
-	  Copeland.  [Ruby 1.9 - Bug #4704]
-	* lib/cgi/cookie.rb:  Clean up CGI::Cookie documentation.  Patch by
-	  David Copeland.  [Ruby 1.9 - Bug #4704]
-
-Tue May 17 05:52:30 2011  Eric Hodel  <drbrain@segment7.net>
-
-	* ext/digest: Improve documentation of Digest, Digest::HMAC and
-	  Digest::SHA2.  Patch by Pete Higgins.  [Ruby 1.9 - Bug #4702]
-
-Tue May 17 03:51:42 2011  Eric Hodel  <drbrain@segment7.net>
-
-	* lib/abbrev.rb:  Hide copyright and revision information from RDoc.
-	  Inspired by patch from David Copeland, bug #4703.
-
-Tue May 17 03:33:21 2011  Eric Hodel  <drbrain@segment7.net>
-
-	* lib/timeout.rb (module Timeout):  Hide internal constants.  Patch by
-	  Pete Higgins.  [Ruby 1.9 - Bug #4701]
-
-Mon May 16 11:21:09 2011  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* configure.in, win32/Makefile.sub (RUBY_SO_NAME): add CPU as prefix
-	  of RUBY_SO_NAME on x64/ia64 mswin/mingw.
-	  [Feature #4602]
-
-Mon May 16 08:00:05 2011  Eric Hodel  <drbrain@segment7.net>
-
-	* lib/rdoc.rb:  Update to RDoc 3.6.1, allows OpenSSL::Digest to be
-	  found.
-
-Mon May 16 05:49:54 2011  Eric Hodel  <drbrain@segment7.net>
-
-	* lib/drb/acl.rb:  Add documentation.
-
-Mon May 16 05:13:20 2011  Martin Bosslet  <Martin.Bosslet@googlemail.com>
-
-	* ext/openssl/ossl_asn1.c: Add documentation.
-
-Mon May 16 00:32:05 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* test/ruby/test_signal.rb (TestSignal#test_signal_process_group):
-	  skip if the platform doesn't have :pgroup capability. (i.e. skip
-	  if mswin32)
-
-Sun May 15 23:53:31 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* include/ruby/intern.h: resurrect old rb_fd_copy().
-	* thread.c (rb_fd_copy): ditto.
-
-Sun May 15 23:45:11 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* include/ruby/intern.h: remove rb_fd_copy() to rb_fd_dup() and
-	  rb_w32_fdcopy() to rb_w32_fd_dup().
-	* win32/win32.c: ditto.
-	* thread.c: ditto.
-
-Sun May 15 22:26:39 2011  CHIKANAGA Tomoyuki  <nagachika00@gmail.com>
-
-	* signal.c (rb_f_kill): accept '-SIGXXX' style signal with Symbol or
-	  implicit conversion with #to_str. [ruby-dev:43169] fixes #4362
-	* test/ruby/test_signal.rb (test_signal_process_group): add a test
-	  for send signal to process group.
-
-Sun May 15 21:22:35 2011  CHIKANAGA Tomoyuki  <nagachika00@gmail.com>
-
-	* cont.c (cont_init): clear macihne_stack_start/end of saved thread to
-	  prevent mark machine stack of GC'ed Thread. root Fiber is not
-	  initialized by fiber_init().
-	  based on a patch by Serge Balyuk [ruby-core:35891] fixes #4612
-	* test/ruby/test_fiber.rb (test_gc_root_fiber): add test for it.
-
-Sun May 15 21:04:29 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* transcode.c (econv_init): revert r31353.  [ruby-dev:43512]
-
-Sun May 15 03:39:35 2011  Eric Hodel  <drbrain@segment7.net>
-
-	* ext/zlib/zlib.c:  Improve documentation.  Patch by Vincent Batts.
-	  [Ruby 1.9 - Bug #4695]
-
-Sun May 15 03:23:46 2011  Eric Hodel  <drbrain@segment7.net>
-
-	* lib/erb.rb:  Document ERB::Compiler.  Patch by Simon Chiang.
-	  [Ruby 1.9 - Bug #4694]
-
-Sun May 15 00:58:47 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-	fix mswin32 build error.
-
-	* missing/setproctitle.c: add #ifdef HAVE_UNISTD_H.
-	* win32/Makefile.sub (MISSING): add setproctitle.obj
-
-Sat May 14 22:45:28 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* missing/setproctitle.c: add to include "ruby/util.h".
-
-Sat May 14 19:52:22 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* test/ruby/test_rubyoptions.rb (TestRubyOptions#test_set_program_name):
-	  add for $0 test.
-
-Sat May 14 19:50:46 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* missing/setproctitle.c (compat_init_setproctitle): use
-	  ruby_strdup() instead of strdup().
-
-Sat May 14 19:37:31 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* include/ruby/missing.h: add setproctitle() declaration.
-	* missing/setproctitle.c: added.
-	* configure.in: add check for missing/setproctitle.c.
-
-	* ruby.c (ruby_process_options): add to call compat_init_setproctitle().
-	* ruby.c (set_arg0): remove all platform specific code. it's
-	  moved to missing/setproctitle.c.
-	* ruby.c (origarg): remove len field. It's no longer used.
-	* ruby.c (get_arglen): removed.
-
-	This patch makes a lot of cleanup set_arg0 related code and fixes
-	[Feature #4689].
-
-Sat May 14 17:42:21 2011  CHIKANAGA Tomoyuki  <nagachika00@gmail.com>
-
-	* process.c (rb_proc_times): improve documentation.
-	  [ruby-core:35785] fixes #4581, reported by Andrew Grimm.
-
-Sat May 14 12:12:54 2011  Martin Bosslet  <Martin.Bosslet@googlemail.com>
-
-	* test/openssl/test_pkey_dsa.rb: Add basic tests and tests that
-	  ensure new public key PEM encoding behavior and ensure backward
-	  compatibility.
-	  [Ruby 1.9 - Bug #4422] [ruby-core:35328]
-	* test/openssl/test_pkey_rsa.rb: Remove line with 'puts'.
-
-Sat May 14 12:06:49 2011  Eric Hodel  <drbrain@segment7.net>
-
-	* lib/rdoc/context.rb (class RDoc):  Fix infinite loop caused by
-	  re-encountering BasicObject.
-
-Sat May 14 10:32:36 2011  Martin Bosslet  <Martin.Bosslet@googlemail.com>
-
-	* test/openssl/test_pkey_rsa.rb: Add tests that ensure new public key
-	  encoding behavior and also ensure backward compatibility.
-	  [Ruby 1.9 - Bug #4421] [ruby-core:35327]
-
-Sat May 14 09:50:10 2011  Eric Hodel  <drbrain@segment7.net>
-
-	* lib/yaml/dbm.rb:  Add documentation.  Patch by Justin Collins.
-	  [Ruby 1.9 - Bug #4693]
-	* lib/yaml/store.rb:  ditto
-
-Sat May 14 09:31:43 2011  Eric Hodel  <drbrain@segment7.net>
-
-	* lib/rdoc.rb: Updated to RDoc 3.6
-
-Sat May 14 07:30:29 2011  Aaron Patterson <aaron@tenderlovemaking.com>
-
-	* ext/psych/lib/psych.rb: released a new gem, so increasing version.
-
-Sat May 14 05:08:32 2011  Martin Bosslet  <Martin.Bosslet@googlemail.com>
-
-	* ext/openssl/ossl_digest.c
-	* ext/openssl/ossl_pkey.c
-	* ext/openssl/ossl_pkey.h
-	* test/openssl/pkey/test_pkey_rsa.rb
-	  Reverted premature commit. Sorry for the noise!
-
-Sat May 14 05:02:58 2011  Eric Hodel  <drbrain@segment7.net>
-
-	* lib/uri.rb:  Add toplevel documentation.  Patch by Vincent Batts.
-	  [Ruby 1.9 - Bug #4690]
-
-Sat May 14 04:19:06 2011  Martin Bosslet  <Martin.Bosslet@googlemail.com>
-
-	* NEWS: Describe altered behaviour for RSA and DSA public key
-	  encoding. [Ruby 1.9 - Bug #4421, Bug #4422]
-	  [ruby-core:35327,35328]
-
-Sat May 14 02:57:52 2011  Eric Hodel  <drbrain@segment7.net>
-
-	* lib/ipaddr.rb (unless Socket):  Document valid*? methods.  Patch by
-	  Sebastian Martinez.  [Ruby 1.9 - Feature #4687]
-
-Sat May 14 02:54:04 2011  Eric Hodel  <drbrain@segment7.net>
-
-	* lib/rexml/functions.rb:  Add some documentation for REXML::Functions.
-	  Patch by Sebastian Martinez.  [Ruby 1.9 - Feature #4688]
-
-Sat May 14 02:51:42 2011  Eric Hodel  <drbrain@segment7.net>
-
-	* lib/resolv.rb:  Hide private method and state-tracking constants from
-	  RDoc.  Patch by Mark Turner.  [Ruby 1.9 - Feature #4691]
-
-Fri May 13 19:23:21 2011  URABE Shyouhei  <shyouhei@ruby-lang.org>
-
-	* numeric.c (flo_coerce): Add #flo_coerce documentation.
-	  Patch by Sebastian Martinez.
-	  https://github.com/ruby/ruby/pull/21
-
-Fri May 13 18:42:22 2011  URABE Shyouhei  <shyouhei@ruby-lang.org>
-
-	* README.EXT: fix typo.  Patch by William Blackerby.
-	  https://github.com/ruby/ruby/pull/19
-
-	* README.EXT.ja: ditto.
-
-Fri May 13 15:22:34 2011  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* win32/win32.c (rb_w32_select): check invalid handle before doing
-	  select operations.  see [ruby-dev:43513], [ruby-dev:43535]
-
-Fri May 13 08:34:00 2011  Eric Hodel  <drbrain@segment7.net>
-
-	* lib/rdoc/rdoc.rb:  Output summary after documentation report.
-	* lib/rdoc/stats/normal.rb:  Don't output information for users when
-	  we're not on a TTY
-
-Fri May 13 07:49:02 2011  Eric Hodel  <drbrain@segment7.net>
-
-	* lib/fileutils.rb:  Hide internal methods from RDoc.  Patch by Darragh
-	  Curran.  [Ruby 1.9 - Bug #4684]
-
-Fri May 13 07:36:23 2011  Eric Hodel  <drbrain@segment7.net>
-
-	* lib/webrick/httpservlet/erbhandler.rb:  Add documentation.
-
-Fri May 13 07:04:33 2011  Eric Hodel  <drbrain@segment7.net>
-
-	* lib/mathn.rb:  Fix indentation.  Patch by Jason Dew.
-	  [Ruby 1.9 - Feature #4682]
-
-Fri May 13 06:50:43 2011  Eric Hodel  <drbrain@segment7.net>
-
-	* lib/mathn.rb:  Add documentation.  Patch by Jason Dew.  [Ruby 1.9 -
-	  Feature #4667]
-
-Fri May 13 05:44:19 2011  Eric Hodel  <drbrain@segment7.net>
-
-	* lib/logger.rb (class Logger):  Document Logger#datetime_format.
-	  Patch by Sergio Gil Perez de la Manga.  [Ruby 1.9 - Bug #4678]
-
-Fri May 13 05:39:11 2011  Eric Hodel <drbrain@segment7.net>
-
-	* re.c (Init_Regexp): Document option constants.  Patch by Vincent
-	  Batts.  [Ruby 1.9 - Bug #4677]
-	* lib/uri/common.rb (module URI):  Documentation for URI.  Patch by
-	  Vincent Batts.  [Ruby 1.9- Bug #4677]
-	* lib/uri/ftp.rb (module URI):  ditto
-	* lib/uri/generic.rb (module URI):  ditto
-	* lib/uri/http.rb (module URI):  ditto
-	* lib/uri/https.rb (module URI):  ditto
-	* lib/uri/ldap.rb (module URI):  ditto
-	* lib/uri/ldaps.rb (module URI):  ditto
-	* lib/uri/mailto.rb (module URI):  ditto
-	* process.c (Init_process):  Document Process constants.  Patch by
-	  Vincent Batts.  [Ruby 1.9- Bug #4677]
-
-Fri May 13 05:16:38 2011  Eric Hodel  <drbrain@segment7.net>
-
-	* lib/rss/atom.rb (module RSS):  Document URIs.  Patch by Mark Turner.
-	  [Ruby 1.9 - #4671]
-	* lib/rss/rss.rb (module RSS):  Document exception classes.  Patch by
-	  Mark Turner.  [Ruby 1.9 - #4671]
-
-Fri May 13 02:15:18 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* io.c (select_internal): remove unused variable (interrupt_flag).
-
-Thu May 12 18:24:34 2011  Kouhei Sutou  <kou@clear-code.com>
-
-	* configure.in: limit to "T" type for prefix of external symbols
-	  because x86_64-w64-mingw32-gcc on Debian GNU/Linux generates the
-	  following symbol:
-	    0000000068483390 D _GLOBAL__F__conftest_external
-
-	  Approved by nobu.
-
-Thu May 12 14:50:52 2011  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* test/dl/test_base.rb (Fiddle::LIBC_SO): its always msvc*.dll on
-	  mswin/mingw.
-
-Thu May 12 14:47:53 2011  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* lib/mkmf.rb (Logging.postpone): copy only when temporary logfile
-	  exists.
-
-Thu May 12 12:24:22 2011  Nobuhiro Iwamatsu  <iwamatsu@nigauri.org>
-
-	* ext/openssl/ossl_ssl.c: By trunk@31346, function check of SSLv2 is
-	  executed.
-	  However, the problem is not revised in this.
-	  This adds the control of using function of SSLv2 in made macro by
-	  function check.
-
-Thu May 12 08:10:46 2011  Eric Hodel  <drbrain@segment7.net>
-
-	* lib/set.rb (class Set):  Add nodoc to internal-use methods.  Patch
-	  by Pete Higgins.  [Ruby 1.9 - Bug #4665]
-
-Thu May 12 08:01:14 2011  Martin Bosslet  <Martin.Bosslet@googlemail.com>
-
-	* ext/openssl/ossl_pkey_ec.c: Allow encryption when PEM-encoding
-	  Elliptic Curve private keys.
-	  [ruby-core:35329] [Bug #4423]
-
-Thu May 12 07:54:59 2011  Eric Hodel  <drbrain@segment7.net>
-
-	* object.c (rb_obj_equal):  Add documentation.  Patch by Vincent Batts.
-	  [Ruby 1.9 - Bug #4664]
-	* lib/rexml:  ditto
-	* lib/mkmf.rb:  ditto
-	* ext/socket/lib/socket.rb:  ditto
-
-Thu May 12 07:30:08 2011  Eric Hodel  <drbrain@segment7.net>
-
-	* Various .document files: Update .document files to match files which
-	  have documentation.
-
-Thu May 12 07:18:45 2011  Martin Bosslet  <Martin.Bosslet@googlemail.com>
-
-	* ext/openssl/ossl_pkey_dsa.c: Use generic X.509 SubjectPublicKeyInfo
-	  format for PEM-encoding DSA public keys.
-	  [ruby-core:35328] [Bug #4422]
-
-Thu May 12 06:27:31 2011  Martin Bosslet  <Martin.Bosslet@googlemail.com>
-
-	* ext/openssl/ossl_pkey_rsa.c: Use generic X.509 SubjectPublicKeyInfo
-	  format for encoding RSA public keys.
-	  [ruby-core:35327] [Bug #4421]
-
-Wed May 11 19:45:27 2011  Keiju Ishitsuka  <keiju@ishitsuka.com>
-
-	* lib/forwardable.rb: support 'delegate :foo => :bar' for to meet
-	  by specification of RDOC.
-
-Wed May 11 08:36:38 2011  Eric Hodel  <drbrain@segment7.net>
-
-	* lib/webrick: Add documentation for WEBrick::HTTPAuth
-
-Wed May 11 03:06:35 2011  Eric Hodel  <drbrain@segment7.net>
-
-	* lib/rss.rb: Add documentation for RSS.  Patch by Steve Klabnik.
-	  [Ruby 1.9 - Bug #4663]
-
-Tue May 10 14:50:32 2011  Shota Fukumori  <sorah@tubusu.net>
-
-	* lib/test/unit.rb: Add option for hiding skip messages when test
-	  ends. #4657
-
-	* test/testunit/test_hideskip.rb, test/testunit/test4test_hideskip.rb:
-	  test for above.
-
-Tue May 10 10:53:04 2011  Eric Hodel  <drbrain@segment7.net>
-
-	* common.mk (rdoc): Add rdoc-coverage rule
-
-Tue May 10 09:13:21 2011  Eric Hodel  <drbrain@segment7.net>
-
-	* lib/webrick: Add Documentation
-
-Tue May 10 04:22:09  Eric Hodel  <drbrain@segment7.net>
-
-	* lib/webrick/log.rb: Hide copyright info from ri
-	* lib/webrick/httpstatus.rb: ditto
-	* lib/webrick/htmlutils.rb: ditto
-	* lib/webrick/httpversion.rb: ditto
-	* lib/webrick/version.rb: ditto
-	* lib/webrick/httpauth/userdb.rb: ditto
-	* lib/webrick/httpauth/authenticator.rb: ditto
-	* lib/webrick/accesslog.rb: ditto
-
-Mon May  9 20:57:13 2011  Tadayoshi Funaba  <tadf@dotrb.org>
-
-	* test/ruby/test_{complex,rational}.rb: added tests.
-
-Mon May  9 20:29:44 2011  Tadayoshi Funaba  <tadf@dotrb.org>
-
-	* complex.c (string_to_c_internal): a refactoring.
-
-Mon May  9 18:33:05 2011  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* string.c: Improve documentation for String#start_with? and
-	  String#end_with?. fixes #4652
-	  patched by Andrew Grimm <andrew.j.grimm at gmail.com>
-
-Mon May  9 13:49:00 2011  Kenta Murata  <mrkn@mrkn.jp>
-
-	* complex.c (string_to_c_internal): support scientific notation.
-	  patched by Tinco Andringa. https://github.com/ruby/ruby/pull/16
-	  [ruby-core:36046][Bug #4655]
-
-Mon May  9 11:52:48 2011  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* numeric.c (int_ord): remove K&R style.
-	  patched by Daehyub Kim. https://github.com/ruby/ruby/pull/17
-
-Sun May  8 22:17:24 2011  Tadayoshi Funaba  <tadf@dotrb.org>
-
-	* test/ruby/test_{complex2,complexrational}.rb: use skip.
-	* test/date/*.rb: ditto.
-
-Sun May  8 21:02:31 2011  Tadayoshi Funaba  <tadf@dotrb.org>
-
-	* test/ruby/test_{complex2,complexrational}.rb: NEVER SKIP.
-
-Sun May  8 21:01:21 2011  Tadayoshi Funaba  <tadf@dotrb.org>
-
-	* test/date/test_date_base.rb: fixed.
-
-Sun May  8 20:54:11 2011  Tadayoshi Funaba  <tadf@dotrb.org>
-
-	* test/date/*.rb: NEVER SKIP.
-
-Sun May  8 20:37:33 2011  Tadayoshi Funaba  <tadf@dotrb.org>
-
-	* test/date/*.rb: reverted 31432.
-
-Sun May  8 20:32:43 2011  Tadayoshi Funaba  <tadf@dotrb.org>
-
-	* test/date/*.rb: reverted 31483.
-
-Sun May  8 19:39:16 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* thread_pthread.c (native_cond_timedwait): add to care EINTR.
-	* thread_pthread.c (thread_timer): remove EINTR check.
-
-Sun May  8 19:04:15 2011  Tadayoshi Funaba  <tadf@dotrb.org>
-
-	* lib/time.rb (xmlschema): avoid passing any negative numbers.
-
-Sun May  8 18:40:03 2011  Tadayoshi Funaba  <tadf@dotrb.org>
-
-	* ext/date/date_{parse,strptime}.c: introduced some macros.
-
-Sun May  8 17:17:13 2011  Tadayoshi Funaba  <tadf@dotrb.org>
-
-	* test/date/*.rb: use skip /w messages.
-
-Sun May  8 17:04:55 2011  Tadayoshi Funaba  <tadf@dotrb.org>
-
-	* ext/date/lib/date/format.rb (_httpdate): omitted to call zone_to_diff.
-
-Sun May  8 16:56:19 2011  Tadayoshi Funaba  <tadf@dotrb.org>
-
-	* ext/date/date_core.c (date_s_test_*): use macros.
-
-Sun May  8 10:24:16 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* thread_pthread.c: cleanup signal_thread_list related ifdef.
-	  1) we don't have to use #ifdef FOO-PLATFORM directly 2) About
-	  half #ifdef didn't care symbian properly.
-
-Sun May  8 05:19:37 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* test/io/wait/test_io_wait.rb: Linux socketpair(2) only support
-	  AF_UNIX, but windows socketpair doesn't support it. we can't
-	  avoid platform check. sigh!
-
-Sun May  8 00:13:05 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* test/io/wait/test_io_wait.rb: use Socket.pair instead of pipe.
-	  Windows can only treat a socket.
-
-Sat May  7 22:43:48 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* thread.c (rb_fd_zero): remove redundant zero fill.
-
-Sat May  7 22:38:04 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* thread.c (rb_fd_init): remove volatile qualifier.
-
-Sat May  7 22:34:29 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* thread.c (rb_fd_init_copy): new internal api. It provide efficient
-	  copy constructor semantics.
-	* thread.c (do_select): use rb_fd_init_copy().
-
-Sat May  7 15:18:06 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-	fix incorrect native_cond_signal call when deadlock was detected.
-
-	* thread.c (lock_func): decrement cond_waiting if timeout was happen.
-
-Sat May  7 18:28:37 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* thread_pthread.c (USE_MONOTONIC_COND): check the availability
-	  more strictly.
-
-	* thread_pthread.h (rb_thread_cond_t): ditto.
-
-Sat May  7 15:15:10 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	fix win32 native_cond_timedwait() makes SIGSEGV.
-
-	* thread_win32.h (rb_thread_cond_struct): add prev field instead of
-	  last. (ie cond_event_entry is now using double linked list instead of
-	  single)
-	* thread_win32.c (cond_event_entry): add prev field.
-
-	* thread_win32.c (__cond_timedwait): remove entry properly if timeout
-	  was happen.
-
-	* thread_win32.c (native_cond_signal): change for double linked list.
-	* thread_win32.c (native_cond_broadcast): ditto.
-	* thread_win32.c (native_cond_initialize): ditto.
-
-Sat May  7 12:41:04 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-	fix mutex deadlock test hang-up.
-
-	* thread_win32.c (abs_timespec_to_timeout_ms): fix 1000x calculation
-	  mistake. (ie fix hang-up native_cond_timedwait())
-
-Sat May  7 03:14:13 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	sleep_cond use monotonic time if possible.
-
-	* thread_pthread.c (native_thread_init): change sleep_cond
-	  attribute to monotonic.
-	* thread_pthread.c (native_sleep): use native_cond_timeout().
-
-	* thread_pthread.c (native_cond_timeout): add overflow care.
-	* thread_win32.c (native_cond_timeout): ditto.
-
-Sat May  7 02:49:12 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-	  fix win32 compile error.
-
-	* thread_win32.c (RB_CONDATTR_CLOCK_MONOTONIC): define
-	  RB_CONDATTR_CLOCK_MONOTONIC always.
-	* thread_pthread.c (RB_CONDATTR_CLOCK_MONOTONIC): ditto.
-
-Sat May  7 02:29:41 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	  mutex: deadlock check timeout use monotonic time.
-
-	* thread_pthread.c (native_cond_timeout): new internal api.
-	  it calculate a proper time for argument of native_cond_timedwait().
-	* thread_win32.c (native_cond_timeout): ditto.
-
-	* thread_pthread.c (thread_timer): use native_cond_timeout()
-	  instead of get_ts.
-	* thread.c (lock_func): ditto.
-
-	* thread_pthread.c (get_ts): removed. use native_cond_timeout().
-	* thread.c (init_lock_timeout): ditto.
-
-Sat May  7 01:54:21 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* thread_pthread.c (get_ts): add monotonic clock capability.
-	* thread_pthread.c (rb_thread_create_timer_thread): use monotonic
-	  clock if possible.
-
-Sat May  7 01:43:37 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* thread_pthread.h (rb_thread_cond_t): add clockid field. it's
-	  no longer an alias of pthread_cond_t.
-	* thread_pthread.c: adapt new rb_thread_cond_t type.
-	* thread.c (mutex_alloc): ditto.
-	* thread_win32.c (native_cond_initialize): ditto.
-	* configure.in: add check for pthread_cond_attr_setclock() and
-	  clockid_t type.
-
-Fri May  6 23:29:47 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* thread.c (rb_wait_for_single_fd): use ppoll() instead of poll()
-	  if possible. based on a patch from Eric Wong. [ruby-core:36003].
-
-Fri May  6 23:13:43 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* configure.in: remove nanosleep check. we no longer use it.
-	  r20124 removed last usage.
-
-Fri May  6 22:35:56 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* ext/syck/rubyext.c (mktime_do): extra digits are not used.
-
-Fri May  6 17:43:07 2011  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* ext/syck/rubyext.c (mktime_do): remove unused variable offset.
-
-	* ext/syck/syck.h: use #ifdef instead of #if DEBUG.
-
-Fri May  6 16:27:33 2011  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* ext/date/date_core.c (DAY_IN_NANOSECONDS): refix: 31438.
-	  check with LONG_MAX and cast as long; without this the calculation
-	  will be done as int and overflow.
-
-Fri May  6 15:01:11 2011  URABE Shyouhei  <shyouhei@ruby-lang.org>
-
-	* ext/syck/rubyext.c (mktime_do): avoid buffer overrun, by
-	  silently ignoring lesser significant digits.  Required buffer
-	  length can be computable so you might at first think of
-	  allocating enough memory space on the fly using alloca().  That
-	  is a wrong idea because when using alloca there is always risk
-	  of integer overflow.  A function that accepts outer-process
-	  resources like this should not blindly trust its inputs.  In
-	  this particular case we just want to generate milliseconds
-	  resolution by strtod() so the string in question needs no more
-	  length than what we originally have.  Ignoring lesser
-	  significant digits should suffice I believe.
-
-Fri May  6 14:25:53 2011  Tinco Andringa <mail@tinco.nl>
-
-	* ext/syck/rubyext.c (mktime_do): YAML.load time correctly parse
-	  usecs smaller than 1 fixes #4571
-
-Thu May  5 22:23:34 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* thread_pthread.c (native_mutex_reinitialize_atfork): removed
-	  unused macro.
-	* thread_win32.c (native_mutex_reinitialize_atfork): ditto.
-
-Thu May  5 22:09:39 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* ext/date/date_core.c (DAY_IN_NANOSECONDS): long long int is not
-	  available on all platforms.
-
-Thu May  5 17:36:31 2011  CHIKANAGA Tomoyuki  <nagachika00@gmail.com>
-
-	* eval.c (frame_func_id): store result of method_entry_of_iseq() to
-	  cfp->me because method_entry_of_iseq() might become expensive.
-
-Thu May  5 15:03:51 2011  CHIKANAGA Tomoyuki  <nagachika00@gmail.com>
-
-	* eval.c (frame_func_id): __method__ return different name from
-	  methods defined by Module#define_method with a same block.
-	  [ruby-core:35386] fixes #4606
-	* eval.c (method_entry_of_iseq): new helper function. search control
-	  frame stack for a method entry which has given iseq.
-	* test/ruby/test_method.rb: add tests for #4606
-
-Wed May  4 22:13:09 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* benchmark/bm_vm4_pipe.rb: Reduced iterations. Too slow benchmark
-	  is bad.
-	* benchmark/bm_vm4_thread_pass.rb: ditto.
-
-Wed May  4 22:08:22 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* test/date/test_date_base.rb: don't use no message skip().
-
-Wed May  4 21:11:28 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* benchmark/bm_io_select2.rb: reduce number of using file
-	  descriptors. because gdb need some fds.
-
-Wed May  4 19:00:59 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* thread.c (rb_wait_for_single_fd): Fix wrong return value.
-	* test/-ext-/wait_for_single_fd/test_wait_for_single_fd.rb
-	  (TestWaitForSingleFD#test_wait_for_closed_pipe): test for it.
-
-Wed May  4 18:46:39 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* ext/-test-/wait_for_single_fd: New. for testing
-	  rb_wait_for_single_fd() internal function.
-	  The patch was written by Eric Wong. [ruby-core:35991]
-
-	* test/-ext-/wait_for_single_fd/test_wait_for_single_fd.rb: ditto.
-
-Wed May  4 12:46:25 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* thread.c (rb_wait_for_single_fd): Added POLLNVAL check.
-	  based on a patch from Eric Wong at [ruby-core:35991].
-
-Wed May  4 11:51:01 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* io.c (rb_f_select): remove useless ifdef.
-
-Wed May  4 11:42:47 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* ext/socket/init.c (wait_connectable): fix error handling code.
-	  RB_WAITFD_OUT is turned on even though an error occur.
-
-Wed May  4 10:12:39 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* ext/readline/readline.c (readline_event): use rb_wait_for_single_fd().
-	The patch was written by Eric Wong. [Ruby 1.9 - Feature #4531]
-
-Wed May  4 10:10:28 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* ext/socket/init.c (wait_connectable): use rb_wait_for_single_fd().
-	  The patch was written by Eric Wong. [Ruby 1.9 - Feature #4531]
-
-	* ext/socket/init.c (try_wait_connectable, wait_connectable_ensure):
-	  removed.
-
-Wed May  4 10:07:48 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* ext/io/wait/wait.c (io_wait): use rb_wait_for_single_fd().
-	  The patch was written by Eric Wong. [Ruby 1.9 - Feature #4531]
-
-Wed May  4 10:01:27 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* thread.c (rb_wait_for_single_fd): new. poll(2) based backend for
-	  rb_wait_for_single_fd().
-	  Now only Linux uses it.
-
-	The patch was written by Eric Wong. [Ruby 1.9 - Feature #4531]
-
-Wed May  4 09:56:57 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* thread.c (rb_wait_for_single_fd): new.
-	* thread.c (select_single): select(2) based backend for
-	  rb_wait_for_single_fd().
-
-	* io.c (make_writeconv): use rb_wait_for_single_fd() instead of
-	  rb_thread_fd_select().
-	* io.c (rb_io_wait_readable): ditto.
-	* thread.c (rb_thread_wait_fd_rw): ditto.
-
-	* io.c (wait_readable): removed.
-	* thread.c (init_set_fd): new helper function.
-	* include/ruby/io.h (RB_WAITFD_IN, RB_WAITFD_PRI, RB_WAITFD_OUT):
-	  new constant for rb_single_wait_fd().
-
-	The patch was written by Eric Wong. [Ruby 1.9 - Feature #4531]
-
-Wed May  4 08:04:59 2011  Aaron Patterson <aaron@tenderlovemaking.com>
-
-	* ext/psych/lib/psych/visitors/yaml_tree.rb: fix time dumping so that
-	  Syck can load UTC times that Psych dumps.
-
-Wed May  4 07:33:00 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* thread.c (rb_fd_copy): fix wrong argument.This issue was pointed
-	  out by Eric Wong. [ruby-core:35982]
-
-Tue May  3 20:29:33 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* test/fileutils/test_fileutils.rb (TestFileUtils#test_chmod_symbol_mode):
-	  Skip sticky bit test if the platform is FreeBSD. It doesn't allow to
-	  change sticky bit if a target is regular file.
-
-Tue May  3 18:23:57 2011  Yuki Sonoda (Yugui)  <yugui@yugui.jp>
-
-	* test/date/test_date.rb (TestDate#test_coerce):
-	  test for [ruby-core:35127].
-
-Tue May  3 04:27:53 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* thread.c (rb_thread_select): preserve errno if no error
-	  occurred.
-
-Tue May  3 03:57:04 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* include/ruby/intern.h (rb_w32_fdcopy): add prototype.  fixes
-	  #4640
-
-Mon May  2 01:02:04 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* lib/fileutils.rb (FileUtils#chmod): accept symbolic mode argument.
-	  The patch was written by takkanm. [ruby-core:26029][Feature #2190]
-
-	* lib/fileutils.rb (FileUtils#fu_mode): new helper function.
-	* lib/fileutils.rb (FileUtils#symbolic_modes_to_i): ditto.
-	* lib/fileutils.rb (FileUtils#mode_mask): ditto.
-	* lib/fileutils.rb (FileUtils#user_mask): ditto.
-
-	* test/fileutils/test_fileutils.rb (TestFileUtils#test_chmod_symbol_mode):
-	  new test for the above symbolic mode.
-	* test/fileutils/test_fileutils.rb (TestFileUtils#test_chmod_R): ditto.
-
-Mon May  2 00:36:12 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* ext/socket/init.c (rsock_connect): add to care EINTR. based
-	  on a patch from Eric Wong at [ruby-core:35621][Bug #4555]
-
-Sun May  1 01:06:24 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* thread.c (rb_thread_select): release GVL while waiting select().
-
-Sat Apr 30 23:10:15 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* win32/win32.c (rb_w32_fdcopy): New. This can copy even though
-	  fdset size exceed FD_SETSIZE.
-	* include/ruby/intern.h (rb_fd_copy): use rb_w32_fdcopy()
-
-Sat Apr 30 20:18:43 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* thread.c (do_select): Change argument type to rb_fdset_t.
-	  Now do_select() is free from unexpected hangup if
-	  HAVE_RB_FD_INIT=1 [Bug #4636]
-
-	* thread.c (rb_thread_fd_select, rb_thread_wait_fd_rw):
-	  adapt new argument type.
-
-	* thread.c (rb_thread_select): make dummy implementation.
-
-Sat Apr 30 20:16:53 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* thread.c (rb_fd_copy): Change function argument. Now
-	  rb_fd_copy() has fully copy semantics.
-	* include/ruby/intern.h: ditto.
-
-Sat Apr 30 20:11:47 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* include/ruby/intern.h (rb_thread_select): mark as deprecated.
-
-	* ext/io/wait/wait.c (wait_readable): use rb_thread_fd_select
-	  instead of rb_thread_select.
-	* ext/socket/init.c (wait_connectable0): ditto.
-	* ext/readline/readline.c (readline_event): ditto.
-	* io.c (rb_io_wait_readable, wait_readable, rb_io_wait_writable,
-	  wait_writable): ditto.
-
-Sat Apr 30 20:06:36 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* thread.c (do_select): remove useless ifdef. time calculation
-	  is not heavy weight.
-
-Sat Apr 30 16:48:36 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* benchmark/bm_io_select3.rb: New.
-
-Sat Apr 30 16:27:09 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* io.c (copy_stream_body, rb_io_s_copy_stream): move rb_fd_init()
-	  from copy_stream_body to rb_io_s_copy_stream. fds of passing
-	  rb_fd_term() have to be guaranteed initialized.
-
-Sat Apr 30 16:13:17 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* benchmark/bm_io_select.rb, benchmark/bm_io_select2.rb: New.
-	  based on a patch from Eric Wong at [Feature #4531]
-
-Sat Apr 30 03:25:53 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* test/io/wait/test_io_wait.rb: New. for testing ext/io/wait.
-	  the patch was written by Eric Wong. [Feature #4531]
-
-Sat Apr 30 00:34:56 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* include/ruby/win32.h: remove redundant declaration of
-	  rb_w32_time_subtract().
-
-Sat Apr 30 00:16:40 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* thread_pthread.c (gvl_init): fix hangup if GVL_SIMPLE_LOCK=1.
-	  We don't have to call mutex_unlock() before initialize it!
-
-Fri Apr 29 13:15:15 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* thread_win32.c (native_cond_timedwait): New. r31373 caused
-	  win32 build failure.
-
-	* thread_win32.c (__cond_timedwait, abs_timespec_to_timeout_ms):
-	  New helper functions.
-
-	* win32/win32.c (rb_w32_time_subtract): rename from subtract and
-	  remove static.
-
-Fri Apr 29 10:43:09 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* benchmark/bm_vm4_pipe.rb: Add two new benchmark for GVL
-	  performance. They was written by Koichi Sasada.
-	* benchmark/bm_vm4_thread_pass.rb: ditto.
-
-Fri Apr 29 10:25:31 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* vm_method.c (rb_clear_cache_by_class): Revert r29673. It made
-	  a segmentation fault regression. [Bug #4289][ruby-core:34554].
-
-Fri Apr 29 10:24:51 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* io.c (make_writeconv): do not add textmode newline decorator if any
-	  newline decorator is set already.  fixes #4618, fixes #4619
-
-Fri Apr 29 10:17:42 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* thread.c (lock_func): small cleanup.
-
-Fri Apr 29 10:07:13 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* thread.c (rb_mutex_lock, lock_func): Avoid busy loop and
-	  performance regression. bm_vm3_thread_mutex.rb performance
-	  change from 109.064sec to 16.331sec. [Feature #4607]
-
-	* thread.c (init_lock_timeout): New helper function.
-
-Thu Apr 28 16:15:49 2011  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* win32/{win32.c,dir.h} (rb_w32_uopendir): new API to pass UTF-8 path.
-
-	* win32/win32.c (opendir_internal, rb_w32_opendir): extract and merge
-	  common part of rb_w32_opendir() and rb_w32_uopendir().
-
-	* dir.c (do_opendir, glob_helper): encoding.
-
-	* dir.c (dir_initialize, do_opendir): convert path to UTF-8 and call
-	  rb_w32_uopendir() instead of rb_w32_opendir() on Windows.
-	  fixes #4491, reported by Joey Zhou.
-
-Thu Apr 28 15:32:53 2011  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* test/dl/test_base.rb (DL::LIBC_SO): its always msvc*.dll on
-	  mswin/mingw.
-
-Thu Apr 28 06:07:06 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* lib/csv.rb (CSV::open): suppress universal newline decorator.
-	  fixes #4603
-
-	* lib/csv.rb (CSV.read): no mode is needed.
-
-Thu Apr 28 06:06:56 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* io.c (rb_io_extract_modeenc, rb_f_backquote): set default text
-	  mode.  fixes #4619
-
-	* io.c (pipe_open): set universal newline decorator if needed.
-
-Wed Apr 27 11:33:08 2011  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* enc/trans/emoji_iso2022_kddi.trans: ISO-2022-JP-KDDI doesn't have
-	  CP932 UDA. Another reason is emacs-mule: the implementation of
-	  stateless-iso-2022-jp doesn't support beyond 94x94 (0x7fxx);
-	  but CP932 UDA is in 7Fxx-92xx.
-
-Wed Apr 27 07:42:44 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* configure.in (STRIP): use proper toolchain.  based on a patch
-	  from Jon Forums at [ruby-core:35909].  fixes #4617
-
-Wed Apr 27 01:20:59 2011  Tadayoshi Funaba  <tadf@dotrb.org>
-
-	* ext/date/date_core.c (date_zone_to_diff): renamed.
-	* ext/date/date_parse.c: ditto.
-	* ext/date/date_strptime.c: ditto.
-
-Wed Apr 27 01:16:59 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* encoding.c (enc_find): accept Encoding objects.
-
-Wed Apr 27 00:55:56 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* transcode.c (econv_opts): add newline option.
-
-	* io.c (validate_enc_binmode, rb_io_extract_modeenc): set newline
-	  decorator according to open mode.
-
-	* transcode.c (rb_econv_prepare_options): new function, to prepare
-	  econv options with newline flags.
-
-	* include/ruby/encoding.h (ECONV_NEWLINE_DECORATOR_MASK): add.
-
-Wed Apr 27 00:51:01 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* file.c (rb_file_truncate): fix function.
-
-	* include/ruby/win32.h (ftruncate, truncate, ftello, fseeko): non-64
-	  versions on mingw are useless because they use int32_t.  fixes #4564
-
-Wed Apr 27 00:50:33 2011  Tadayoshi Funaba  <tadf@dotrb.org>
-
-	* ext/date/date_core.c: modified validation methods.
-	* ext/date/lib/date.rb: ditto.
-
-Wed Apr 27 00:00:37 2011  Tadayoshi Funaba  <tadf@dotrb.org>
-
-	* ext/date/date_core.c (dt_lite_set_tmx): should get df value.
-
-Tue Apr 26 22:34:04 2011  Tadayoshi Funaba  <tadf@dotrb.org>
-
-	* ext/date/lib/date/format.rb (_iso8601): allowed day only civil
-	  date.  disallowed separatorless day only ordinal date.
-
-Mon Apr 25 21:31:36 2011  Nobuhiro Iwamatsu  <iwamatsu@nigauri.org>
-
-	* ext/openssl/extconf.rb: Should check SSLv2_*method.
-	  openssl compiled with "no-ssl2" the extconf don't fail
-	  when running `make' having this compilation errors.
-	  Patched by Laurent Arnoud. fixes #4562, #4556
-
-Mon Apr 25 20:53:32 2011  Tajima, Akio <artonx@yahoo.co.jp>
-
-	* win32/win32.c (kill): accept 0 only sig is SIGINT #4596
-
-Mon Apr 25 19:59:47 2011  Tajima, Akio <artonx@yahoo.co.jp>
-
-	* win32/win32.c (kill): accept 0 as pid, fixes #4596
-
-Mon Apr 25 16:43:45 2011  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* random.c (random_rand): remove unused variables.
-
-	* struct.c (rb_struct_define_without_accessor): ditto.
-
-	* strftime.c (rb_strftime_with_timespec): ditto.
-
-	* sprintf.c: ditto.
-
-	* time.c (time_asctime): remove useless GetTimeval().
-
-	* thread_pthread.c: cast to (void *) for %p.
-
-Mon Apr 25 11:02:11 2011  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* ext/ripper/lib/ripper/sexp.rb: fix rdoc around sexp.
-	  patched by Sho Hashimoto. fixes #4599
-
-Mon Apr 25 08:24:04 2011  Shota Fukumori  <sorah@tubusu.net>
-
-	* random.c (rb_f_rand, random_s_rand): RDocs for them.
-
-Mon Apr 25 07:18:00 2011  Kenta Murata  <mrkn@mrkn.jp>
-
-	* random.c (random_s_rand, Init_Random): Random.rand should behave as
-	  Random::DEFAULT.rand rather than Kernel#rand.
-
-	* random.c (rand_range, random_rand): rand_range function extracted
-	  from random_rand function.
-
-	* random.c (rb_f_rand): accept a Range argument as Random#rand
-	  [ruby-dev:43427] #4605
-
-Mon Apr 25 03:31:06 2011  Tadayoshi Funaba  <tadf@dotrb.org>
-
-	* lib/time.rb: require 'date'.
-	* ext/date/lib/date/format.rb: removed require line.
-
-Mon Apr 25 03:08:39 2011  Tadayoshi Funaba  <tadf@dotrb.org>
-
-	* ext/date/lib/date/format.rb: require 'date'.
-
-Mon Apr 25 03:04:16 2011  Tadayoshi Funaba  <tadf@dotrb.org>
-
-	* ext/date/lib/date/format.rb (_iso8601): added a pattern.
-
-Mon Apr 25 02:51:22 2011  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* ext/date/lib/date/format.rb: require 'date_core.so'.
-	  date/format needs methods which are now in date_core.so.
-	  This breaks make rdoc which uses Date._parse from time.rb.
-
-Mon Apr 25 02:47:46 2011  Tadayoshi Funaba  <tadf@dotrb.org>
-
-	* ext/date/lib/date/format.rb (_iso8601): fixed a bug of regex.
-
-Mon Apr 25 02:12:26 2011  Tadayoshi Funaba  <tadf@dotrb.org>
-
-	* ext/date/lib/date/format.rb: an adjustment of regex.
-
-Mon Apr 25 01:58:50 2011  Tadayoshi Funaba  <tadf@dotrb.org>
-
-	* ext/date/lib/date/format.rb: omitted to call _parse.
-
-Mon Apr 25 01:03:03 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* string.c (rb_to_id): remove unused variable.
-
-Sun Apr 24 22:19:05 2011  Tadayoshi Funaba  <tadf@dotrb.org>
-
-	* complex.c, rational.c: omitted some method calls.
-
-Sun Apr 24 02:57:27 2011  Tadayoshi Funaba  <tadf@dotrb.org>
-
-	* ext/date/date_parse.c (n2i): takes long.
-
-Sun Apr 24 02:51:06 2011  Tadayoshi Funaba  <tadf@dotrb.org>
-
-	* ext/date/date_parse.c: reverted.
-
-Sun Apr 24 02:25:23 2011  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* include/ruby/intern.h: pcc can't use __builtin_constant_p.
-
-	* vm_exec.c: change condition.
-
-Sun Apr 24 01:58:01 2011  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* ext/date/date_core.c (leap_p): suppress warning: parentheses.
-
-	* ext/date/date_core.c (date_s__parse_internal): remove unused
-	  variable "str".
-
-	* ext/date/date_parse.c (parse_ddd_cb): use RSTRING_LENINT.
-
-	* ext/date/date_strftime.c (date_strftime_with_tmx): remove unused
-	  variable.
-
-Sun Apr 24 00:34:23 2011  Tadayoshi Funaba  <tadf@dotrb.org>
-
-	* ext/date/date_parse.c: removed some unused macros.  use strchr()
-	  instead of index().
-
-Sat Apr 23 21:29:42 2011  Tadayoshi Funaba  <tadf@dotrb.org>
-
-	* ext/date/date_core.c: replacement of implementation of
-	  _parse.  [experimental]
-	* ext/date/date_parse.c: new.
-	* ext/date/lib/date/format.rb: removed ruby version of _parse.
-
-Fri Apr 22 12:04:15 2011  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* array.c (rb_ary_sort_bang): fix rdoc.
-	  patched by burningTyger. https://github.com/ruby/ruby/pull/11
-
-Fri Apr 22 11:49:49 2011  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* lib/xmlrpc/create.rb (XMLRPC::Create#conv2value):
-	  XML-RPC's int is 32bit int, and Fixnum also may be beyond 32bit.
-
-	* lib/xmlrpc/create.rb (XMLRPC::Create#conv2value):
-	  XML-RPC doesn't allow Infinity and NaN.
-	  http://www.xmlrpc.com/spec
-
-Fri Apr 22 04:16:14 2011  Aaron Patterson <aaron@tenderlovemaking.com>
-
-	* ext/psych/parser.c (parse): strings from psych have proper taint
-	  markings.
-
-	* test/psych/test_tainted.rb: test for string taint
-
-Thu Apr 21 01:30:02 2011  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* random.c (rb_f_srand): fix rdoc: srand(0)'s 0 is a seed.
-	  [ruby-core:35833] fixes #4590
-
-Thu Apr 21 01:01:28 2011  Masaya Tarui  <tarui@ruby-lang.org>
-
-	* win32/win32.c (CreateChild): maximum length of lpCommandLine is
-	  32,768 characters, including the Unicode terminating null character.
-
-Wed Apr 20 21:32:11 2011  Tadayoshi Funaba  <tadf@dotrb.org>
-
-	* ext/date/date_strptime.c (date__strptime_internal): do not
-	  overwrite local variables.
-
-Wed Apr 20 14:41:28 2011  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* string.c (rb_str_each_line): check string's length when compare
-	  separator and string. [ruby-core:35815] fixes #4586
-
-Wed Apr 20 00:02:13 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* misc/ruby-mode.el (ruby-parse-partial): use position of open paren.
-
-Tue Apr 19 01:00:21 2011  Tajima Akio <artonx@yahoo.co.jp>
-
-	* test/ruby/test_io.rb (TestIO#test_cross_thread_close_fd):
-	  skip cross thread pipe close if windows
-
-Mon Apr 18 12:15:46 2011  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* test/ruby/test_range.rb (TestRange#test_step_ruby_core_35753):
-	  avoid float error. [ruby-core:35804]
-
-Sun Apr 17 00:20:14 2011  Tadayoshi Funaba  <tadf@dotrb.org>
-
-	* ext/date/date_{core,strftime}.c: use struct tmx instead of vtm.
-	* ext/date/date_tmx.h: new.
-
-Sat Apr 16 22:23:52 2011  Tadayoshi Funaba  <tadf@dotrb.org>
-
-	* ext/date/date_strftime.c (date_strftime_wo_timespec): changed
-	  the way of validation of locale modifiers.
-
-Sat Apr 16 21:55:12 2011  Tadayoshi Funaba  <tadf@dotrb.org>
-
-	* ext/date/date_core.c: replacement of implementation of
-	  _strptime.  [experimental]
-	* ext/date/date_strptime.c: new.
-	* ext/date/lib/date/format.rb: removed ruby version of _strptime.
-
-Sat Apr 16 10:18:30 2011  Kazuhiro NISHIYAMA  <zn@mbf.nifty.com>
-
-	* vm.c (Init_VM): suppress warning: "OPT_BASIC_OPERATIONS" is not
-	  defined.
-
-Fri Apr 15 23:41:18 2011  Kazuhiro NISHIYAMA  <zn@mbf.nifty.com>
-
-	* ruby.c (proc_options): suppress warning:
-	  "ALLOW_DEFAULT_SOURCE_ENCODING" is not defined.
-
-Fri Apr 15 15:10:29 2011  Akinori MUSHA  <knu@iDaemons.org>
-
-	* lib/uri/generic.rb (#route_from_path): Fix a bug where
-	  URI('http://h/b/').route_to('http://h/b') wrongly returned './'
-	  (should be '../b'). [Bug #4476]
-
-Fri Apr 15 14:58:06 2011  Akinori MUSHA  <knu@iDaemons.org>
-
-	* lib/fileutils.rb (FileUtils#touch): Fix corrupted output when
-	  mtime is specified in addition to nocreate (and verbose).
-	  ref [ruby-dev:43401]
-
-Thu Apr 14 23:43:43 2011  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* numeric.c (ruby_float_step): wrong loop condition.
-	  fixes [ruby-core:35753], reported by Joey Zhou.
-
-	* test/ruby/test_range.rb (TestRange#test_step_ruby_core_35753):
-	  test above change.
-
-Thu Apr 14 22:48:12 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* lib/test/unit.rb (Test::Unit::Options#setup_options): set possible
-	  values for completion. no conversion is needed.
-
-	* lib/test/unit.rb (Test::Unit::Runner::Worker#initialize): use
-	  positional arguments instead of keyword arguments.
-
-	* lib/test/unit.rb (Test::Unit::Runner#jobs_status): io/console may
-	  not be available. use 80 as the last resort if IO#winsize and
-	  COLUMNS are unavailable.
-
-	* lib/test/unit.rb (Test::Unit::Runner::Worker#died): rename using a
-	  verb.
-
-	* lib/test/unit.rb (Test::Unit::Runner#_run_parallel): check if worker
-	  is signaled and use its exit status.
-
-	* lib/test/unit.rb (Test::Unit::Runner::Worker#dead): no longer @in
-	  and @out are separated.
-
-Thu Apr 14 21:23:29 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* variable.c (rb_autoload_p): search superclasses as same as actual
-	  loading.  fixes [ruby-core:35679]
-
-Thu Apr 14 21:21:06 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* include/ruby/win32.h (frexp, modf): wrongly declared as pure in
-	  mingw math.h.
-
-	* include/ruby/win32.h (ftruncate, truncate): mingw64 misses
-	  prototypes.
-
-	* win32/win32.c (rb_w32_read): suppress warning.
-
-Thu Apr 14 19:55:54 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* lib/fileutils.rb (FileUtils#touch): fix corrupted output when
-	  FileUtils.touch(:nocreate => true, :verbose => true) case.
-	  The patch was written by Hiroyuki Iwatsuki. [ruby-dev:43401]
-
-Thu Apr 14 16:01:45 2011  Kazuhiro NISHIYAMA  <zn@mbf.nifty.com>
-
-	* io.c (rb_f_syscall): suppress warning: "HAVE___SYSCALL" is not
-	  defined.
-
-Thu Apr 14 00:41:09 2011  CHIKANAGA Tomoyuki  <nagachika00@gmail.com>
-
-	* thread.c (thread_fd_close_i): IOError exception should be assigned
-	  to rb_thread_t::thrown_errinfo.
-
-Wed Apr 13 20:12:26 2011  Kazuhiro NISHIYAMA  <zn@mbf.nifty.com>
-
-	* io.c (rb_io_fdatasync): remove unused variable.
-
-Tue Apr 12 20:54:12 2011  Tanaka Akira  <akr@fsij.org>
-
-	* include/ruby/st.h: parenthesize macro arguments.
-
-Tue Apr 12 19:19:50 2011  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* lib/uri/common.rb: avoid race condition. fixes #4572
-
-Tue Apr 12 18:07:13 2011  TAKAO Kouji  <kouji@takao7.net>
-
-	* ext/readline/extconf.rb: --disable-libedit to disable
-	  libedit. fixes #4550
-
-Tue Apr 12 10:37:39 2011  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* include/ruby/win32.h: VC doesn't have ftruncate() and others, but
-	  ruby needs HAVE_ macros to use our emulation functions.
-	  (fix the problem of 31262)
-
-Tue Apr 12 01:33:00 2011  Luis Lavena  <luislavena@gmail.com>
-
-	* configure.in: properly evaluate existence of truncate, ftruncate
-	  and ftello for MinGW. [ruby-core:35678]
-	* win32/win32.c: rename truncate, ftruncate and ftello to avoid
-	  redefinitions.
-	* win32/win32.h: ditto.
-
-Mon Apr 11 21:51:52 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* io.c: revert r31230. Because it made a regression.
-	  [ruby-core:35631]
-
-Mon Apr 11 21:49:18 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* test/ruby/test_io.rb: Added TestIO#test_cross_thread_close_stdio
-	  and TestIO#test_cross_thread_close_fd.
-	  The patch was written by Eric Wong. [ruby-core:35669]
-
-Mon Apr 11 21:15:54 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* file.c (rb_group_member): kill 256K of stack usage.
-	  the patch was written by Eric Wong. [ruby-core:35699]
-
-Mon Apr 11 07:24:13 2011  Eric Hodel  <drbrain@segment7.net>
-
-	* ext/openssl/ossl.c:  Fix typo, document version constants.
-
-Sun Apr 10 22:23:45 2011  Tanaka Akira  <akr@fsij.org>
-
-	* include/ruby/ruby.h: parenthesize macro arguments.
-
-Sat Apr  9 23:31:47 2011  Shota Fukumori  <sorah@tubusu.net>
-
-	* ext/stringio/stringio.c (strio_each, strio_readlines):
-	  Use `NUM2LONG` instead of `FIX2INT`. Fixes [ruby-dev:43395].
-
-Sat Apr  9 23:22:27 2011  Shota Fukumori  <sorah@tubusu.net>
-
-	* ext/stringio/stringio.c (strio_each):
-	  Fix exception message and don't raise immediately if block is not
-	  given.
-	  Fixes [ruby-dev:43394].
-
-	* test/stringio/test_stringio.rb (test_each_line_limit_0):
-	  Fix test for above.
-
-Sat Apr  9 21:54:15 2011  Shota Fukumori  <sorah@tubusu.net>
-
-	* ext/stringio/stringio.c (strio_each, strio_readlines):
-	  limit must not be zero. Fixes [ruby-dev:43392].
-
-	* test/stringio/test_stringio.rb: Add tests for above.
-
-Sat Apr  9 18:01:36 2011  Tanaka Akira  <akr@fsij.org>
-
-	* include/ruby/util.h: parenthesize macro arguments.
-
-Fri Apr  8 16:01:56 2011  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* ext/stringio/stringio.c (strio_getline): check whether str is
-	  a string when str and lim are given.
-	  https://twitter.com/watson1978/status/56225052152168449
-
-Thu Apr  7 20:03:52 2011  Tanaka Akira  <akr@fsij.org>
-
-	* include/ruby/io.h: parenthesize macro arguments.
-
-Wed Apr  6 21:08:31 2011  Tanaka Akira  <akr@fsij.org>
-
-	* include/ruby/intern.h: parenthesize macro arguments.
-
-Wed Apr  6 15:12:40 2011  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* ext/openssl/ossl_pkey_dh.c (ossl_dh_initialize):
-	  pop pushed error after each try of reading. fixes #4550
-
-	* ext/openssl/ossl_pkey_dsa.c (ossl_dsa_initialize): ditto.
-
-	* ext/openssl/ossl_pkey_ec.c (ossl_ec_initialize): ditto.
-
-Wed Apr  6 11:36:44 2011  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* ext/openssl/ossl_pkey_rsa.c (ossl_rsa_initialize):
-	  pop pushed error after each try of reading. fixes #4550
-
-Tue Apr  5 20:33:43 2011  Tanaka Akira  <akr@fsij.org>
-
-	* include/ruby/encoding.h: parenthesize macro arguments.
-
-Mon Apr  4 22:02:16 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* ext/io/nonblock/nonblock.c (io_nonblock_set): Avoid F_SETFL if
-	  we're not changing the O_NONBLOCK bit. F_SETFL is an expensive
-	  operation since it needs to affect all processes with the same
-	  file object.
-	  The patch is written by Eric Wong. [ruby-core:35556]
-
-Mon Apr  4 21:41:26 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* io.c (rb_io_syswrite): While local FS writes are usually
-	  buffered, the buffers can be full or the file opened with
-	  O_SYNC. IO#syswrite can also be used on blocking IOs
-	  (pipe/socket) just like IO#write.
-	  The patch is written by Eric Wong. [ruby-core:35554]
-
-Mon Apr  4 11:50:40 2011  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* test/test_tempfile.rb: simply ignore platform dependent testcases
-	  instead of skipping.
-
-Sun Apr  3 22:52:22 2011  CHIKANAGA Tomoyuki  <nagachika00@gmail.com>
-
-	* ext/syslog/syslog.c: improve rdoc.
-	  a patch by Jonas Pfenniger. [ruby-core:35592] fixes #4545
-
-Sun Apr  3 22:10:09 2011  Tanaka Akira  <akr@fsij.org>
-
-	* ext/zlib/zlib.c: parenthesize macro arguments.
-
-Sun Apr  3 21:33:58 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* configure.in: disable fdatasync again on Mac OS X.
-	  [ruby-core:35493][Bug #4500]
-
-Sun Apr  3 21:16:20 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* io.c (io_reopen): IO#close releases GVL if possible.
-	  close() may block for certain file types (NFS, SO_LINGER
-	  sockets, inotify), so let other threads run. The patch was
-	  created by Eric Wong [ruby-core:35555][Bug #4527]
-
-	* io.c (fptr_finalize): ditto.
-
-	* io.c (maygvl_fclose): new.
-	* io.c (nogvl_fclose): ditto.
-	* io.c (maygvl_close): ditto.
-	* io.c (nogvl_close): ditto.
-
-Fri Apr  1 22:25:50 2011  Tanaka Akira  <akr@fsij.org>
-
-	* ext/syslog/syslog.c: parenthesize macro arguments.
-
-Fri Apr 1 18:53:06 2011  NAKAMURA, Hiroshi  <nahi@ruby-lang.org>
-
-	* lib/webrick/cookie.rb (WEBrick::Cookie.parse): 'white space is
-	  permitted between tokens' according to RFC2965. Though 'Netscape
-	  spec' does not define the syntax clearly, make it tolerant as a
-	  server. As a real-world example, rest-client gem sends
-	  'Cookie: foo=1;bar=2'
-
-	* test/webrick/test_cookie.rb (test_parse_non_whitespace): test it.
-
-Fri Apr  1 13:19:20 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* vm_core.h (RUBY_VM_CHECK_INTS_TH): merge a patch by ko1
-	  in [ruby-dev:43373].
-
-Thu Mar 31 23:15:46 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* misc/ruby-mode.el (ruby-brace-to-do-end, ruby-do-end-to-brace):
-	  adjust space between block beginning and block arguments
-
-Thu Mar 31 20:42:05 2011  Tanaka Akira  <akr@fsij.org>
-
-	* ext/strscan/strscan.c:  parenthesize macro arguments.
-
-Thu Mar 31 18:06:12 2011  Shugo Maeda  <shugo@ruby-lang.org>
-
-	* vm_insnhelper.c (vm_get_ev_const): should ignore crefs with
-	  the NODE_FL_CREF_PUSHED_BY_EVAL flag.
-
-Thu Mar 31 16:49:56 2011  Shugo Maeda  <shugo@ruby-lang.org>
-
-	* vm_insnhelper.c (vm_get_ev_const): search root cref properly.
-	  [ruby-dev:43365]
-
-Thu Mar 31 14:50:25 2011  Shugo Maeda  <shugo@ruby-lang.org>
-
-	* eval.c (rb_mod_s_constants): should ignore crefs with
-	  the NODE_FL_CREF_PUSHED_BY_EVAL flag.
-
-Wed Mar 30 22:55:47 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* misc/ruby-mode.el (ruby-toggle-block): toggle do/end and {}.
-
-	* misc/ruby-mode.el (ruby-move-to-block): move to opening of
-	  block.
-
-Wed Mar 30 14:35:15 2011  Shugo Maeda  <shugo@ruby-lang.org>
-
-	* vm_insnhelper.h (COPY_CREF): should copy
-	  the NODE_FL_CREF_PUSHED_BY_EVAL flag to hide constants from
-	  methods defined by class_eval.  [ruby-dev:43365]
-
-Wed Mar 30 00:24:53 2011  Tanaka Akira  <akr@fsij.org>
-
-	* ext/stringio/stringio.c: parenthesize macro arguments.
-
-Tue Mar 29 21:51:31 2011  CHIKANAGA Tomoyuki  <nagachika00@gmail.com>
-
-	* object.c (rb_String): Kernel#String should call to_str before to_s.
-
-Tue Mar 29 10:28:08 2011  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* test/webrick/test_filehandler.rb
-	  (WEBrick::TestFileHandler#test_short_filename): the cgi doesn't exist
-	  on current directory.
-
-Tue Mar 29 05:19:57 2011  Tanaka Akira  <akr@fsij.org>
-
-	* ext/socket/raddrinfo.c: parenthesize macro arguments.
-
-Tue Mar 29 00:03:51 2011 Tajima Akio <artonx@yahoo.co.jp>
-
-	* test/webrick/test_filehandler.rb (test_short_filename):
-	  read real short filename by cmd because smb mounted files
-	  have different naming convention.
-
-Mon Mar 28 11:38:08 2011  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* ext/date/date_core.c (date_s_today): use int for year.
-
-	* ext/date/date_core.c (datetime_s_now): ditto.
-
-Mon Mar 28 11:07:41 2011  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* ext/extmk.rb: set MFLAGS from MAKEFLAGS when using nmake.
-
-Mon Mar 28 11:07:00 2011  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* common.mk (love): all you need is love.
-
-Sun Mar 27 23:16:31 2011  Tanaka Akira  <akr@fsij.org>
-
-	* ext/socket/ipsocket.c: parenthesize macro arguments.
-
-Sun Mar 27 16:55:34 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* misc/ruby-mode.el (ruby-mode-map): remove unnecessary
-	  binding. fixes
-	  http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=468952
-
-	* misc/ruby-mode.el: suppress warnings at byte compile.  fixes
-	  http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=502926
-
-Sun Mar 27 11:18:35 2011  Tadayoshi Funaba  <tadf@dotrb.org>
-
-	* ext/date/date_core.c: removed unused variables.
-
-Sat Mar 26 15:16:09 2011  Tanaka Akira  <akr@fsij.org>
-
-	* ext/socket/getaddrinfo.c: parenthesize macro arguments.
-
-Sat Mar 26 05:27:34 2011  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* ext/date/lib/date/format.rb (DateTime#strftime): removed because
-	  date_core defines it.
-
-Fri Mar 25 21:59:45 2011  Tadayoshi Funaba  <tadf@dotrb.org>
-
-	* ext/date/date_core.c: should not force cast with macros.
-
-Fri Mar 25 21:56:10 2011  Tanaka Akira  <akr@fsij.org>
-
-	* ext/sdbm/init.c: parenthesize macro arguments.
-
-Fri Mar 25 19:39:40 2011  Ben Walton <bwalton@artsci.utoronto.ca>
-
-	* test/test_syslog.rb:
-	  Skip syslog tests that rely on LOG_PERROR unless it's defined
-
-	  Instead of checking looking at the platform to determine if the tests
-	  relying on LOG_PERROR should be run, look for the definition of the
-	  constant as this will be robust against all platforms as long as the
-	  underlying syslog.c code sets it up correctly.
-
-	  This specifically addresses failures on Solaris 9.
-
-	  Use LOG_PID instead of LOG_PERROR in Syslog.open test
-
-	  LOG_PERROR isn't a POSIX option for syslog, so it fails on platforms
-	  that don't define it.  Solaris 9 and 10 are examples of this.
-
-	  Use LOG_PID instead.
-
-Fri Mar 25 15:42:17 2011  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* ext/sdbm/_sdbm.c (sdbm_open): use size_t.
-
-	* ext/syck/bytecode.c: ditto.
-
-	* ext/sdbm/_sdbm.c (delpair): use ptrdiff_t.
-
-	* ext/sdbm/init.c: use RSTRING_LENINT.
-
-	* ext/dl/handle.c: suppress warning: shorten-64-to-32.
-
-	* ext/strscan/strscan.c: ditto.
-
-	* ext/syck/emitter.c: ditto.
-
-	* ext/syck/implicit.c: ditto.
-
-	* ext/syck/syck.c: ditto.
-
-	* ext/syck/token.c: ditto.
-
-Fri Mar 25 12:14:58 2011  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* ext/nkf/nkf-utf8/nkf.c: import nkf 7f18e30.
-
-Fri Mar 25 11:49:29 2011  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* test/ruby/test_process.rb (TestProcess#test_no_curdir): skip silently
-	  on Windows, because this tests a platform specific feature and it'll
-	  never be supported on ruby on Windows.
-
-	* test/ruby/test_dir_m17n.rb
-	  (TestDir_M17N#test_filename_extutf8_invalid,
-	  TestDir_M17N#test_filename_as_bytes_extutf8): ditto.
-
-	* test/open-uri/test_open-uri.rb
-	  (TestOpenURI#test_find_proxy_case_sensitive_env): ditto.
-
-	* test/dl/test_handle.rb (DL::TestHandle#test_NEXT,
-	  DL::TestHandle#test_DEFAULT): ditto.
-
-Thu Mar 24 23:06:29 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* vm_insnhelper.c (vm_get_ev_const): should not autoload in
-	  defined? mode.
-
-	* variable.c (rb_const_defined_0): fix autoloading base.
-	  [ruby-core:35509]
-
-Thu Mar 24 22:48:43 2011  Tanaka Akira  <akr@fsij.org>
-
-	* ext/sdbm/_sdbm.c: parenthesize macro arguments.
-
-Thu Mar 24 14:45:57 2011  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* ext/openssl/ossl.c: suppress warning: shorten-64-to-32.
-
-	* ext/openssl/ossl.h: ditto.
-
-	* ext/openssl/ossl_asn1.c: ditto.
-
-	* ext/openssl/ossl_bio.c: ditto.
-
-	* ext/openssl/ossl_bn.c: ditto.
-
-	* ext/openssl/ossl_cipher.c: ditto.
-
-	* ext/openssl/ossl_hmac.c: ditto.
-
-	* ext/openssl/ossl_ns_spki.c: ditto.
-
-	* ext/openssl/ossl_ocsp.c: ditto.
-
-	* ext/openssl/ossl_pkcs5.c: ditto.
-
-	* ext/openssl/ossl_pkey.c: ditto.
-
-	* ext/openssl/ossl_pkey_dh.c: ditto.
-
-	* ext/openssl/ossl_pkey_dsa.c: ditto.
-
-	* ext/openssl/ossl_pkey_ec.c: ditto.
-
-	* ext/openssl/ossl_pkey_rsa.c: ditto.
-
-	* ext/openssl/ossl_rand.c: ditto.
-
-	* ext/openssl/ossl_ssl.c: ditto.
-
-	* ext/openssl/ossl_x509ext.c: ditto.
-
-	* ext/openssl/ossl_x509name.c: ditto.
-
-Thu Mar 24 11:48:19 2011  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* ext/openssl/ossl_rand.c (ossl_rand_egd_bytes): use NUM2INT because
-	  the result is used with functions whose argument is int.
-
-	* ext/openssl/ossl_ssl.c (ossl_sslctx_setup): ditto.
-
-	* ext/openssl/ossl_x509store.c (ossl_x509store_set_purpose): ditto.
-
-	* ext/openssl/ossl_x509store.c (ossl_x509store_set_trust): ditto.
-
-	* ext/openssl/ossl_x509store.c (ossl_x509stctx_set_purpose): ditto.
-
-	* ext/openssl/ossl_x509store.c (ossl_x509stctx_set_trust): ditto.
-
-Thu Mar 24 11:36:55 2011  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* ext/openssl/ossl_x509name.c: id_aref's type is ID.
-
-Thu Mar 24 10:04:35 2011  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* ext/io/console/console.c (console_set_winsize):
-	  suppress warning: shorten-64-to-32.
-
-Thu Mar 24 09:56:19 2011  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* ext/openssl/ossl_ocsp.c (ossl_ocspreq_verify): flags is VALUE,
-	  so it should use NUM2INT.
-
-	* ext/openssl/ossl_ocsp.c (ossl_ocspbres_verify): ditto.
-
-Wed Mar 23 21:09:29 2011  Tanaka Akira  <akr@fsij.org>
-
-	* ext/readline/readline.c: parenthesize macro arguments.
-
-Wed Mar 23 08:07:33 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* numeric.c (flo_round): fix inaccurate results.
-
-Wed Mar 23 00:12:16 2011  Tajima Akio <artonx@yahoo.co.jp>
-
-	* win32/win32.c: wait process real termination after reading
-	  exit code. fixes #4518
-
-Tue Mar 22 21:20:10 2011  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* lib/rubygems/test_case.rb: save current dir to @current_dir
-	  before Dir.chdir.
-
-Tue Mar 22 20:10:04 2011  Tanaka Akira  <akr@fsij.org>
-
-	* ext/psych/parser.c: parenthesize macro arguments.
-
-Tue Mar 22 20:10:01 2011  Tanaka Akira  <akr@fsij.org>
-
-	* ext/openssl/ruby_missing.h: parenthesize macro arguments.
-
-Tue Mar 22 13:33:22 2011  NAKAMURA, Hiroshi  <nahi@ruby-lang.org>
-
-	* ext/openssl/lib/openssl/buffering.rb: removed circular require of
-	  openssl.rb.
-
-	* ext/openssl/lib/openssl/*: removed following comment for transition
-	  measures of avoiding circular require. No one claimed about this as
-	  far as I know.
-	  ##
-	  # Should we care what if somebody require this file directly?
-	  # require "openssl"
-
-Tue Mar 22 10:57:36 2011  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* test/runner.rb: set Gem::TestCase's @@project_dir.
-
-	* lib/rubygems/test_case.rb: set Gem::TestCase's @@project_dir only
-	  when it is not defined.
-
-Tue Mar 22 09:38:19 2011  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* numeric.c (flo_round): use pow instead of while-loop. fixes #4510
-	  patched by Alex Young [ruby-core:35526]
-
-Tue Mar 22 06:47:46 2011  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* ext/date/date_strftime.c (date_strftime_wo_timespec):
-	  suppress warning: shorten-64-to-32.
-
-Tue Mar 22 06:42:42 2011  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* ext/date/date_core.c: suppress warning: shorten-64-to-32.
-
-Tue Mar 22 06:41:37 2011  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* lib/test/unit/parallel.rb: remove unused variable.
-
-Tue Mar 22 06:19:42 2011  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* enc/utf_16le.c: suppress warning: shorten-64-to-32.
-
-	* ext/dbm/dbm.c: ditto.
-
-	* ext/gdbm/gdbm.c: ditto.
-
-	* parse.y (Init_ripper): suppress warning: unused value.
-
-Mon Mar 21 11:21:32 2011  Shota Fukumori  <sorah@tubusu.net>
-
-	* lib/test/unit.rb: Refactoring. Unified if and elsif.
-
-Sun Mar 20 23:09:34 2011  Tadayoshi Funaba  <tadf@dotrb.org>
-
-	* ext/date/date_strftime.c: checks duplicated modifiers.
-
-Sun Mar 20 22:32:30 2011  Tadayoshi Funaba  <tadf@dotrb.org>
-
-	* ext/date/date_strftime.c: removed unused code and arguments.
-
-Sun Mar 20 21:34:49 2011  Tadayoshi Funaba  <tadf@dotrb.org>
-
-	* ext/date/date_core.c: replacement of implementation of
-	  strftime. It has some limitations that is same as Time's
-	  one.  [experimental]
-	* ext/date/date_strftime.c: new.
-	* ext/date/lib/date/format.rb: removed ruby version of strftime.
-
-Sun Mar 20 12:43:12 2011  Tanaka Akira  <akr@fsij.org>
-
-	* ext/openssl/ossl_x509store.c: parenthesize macro arguments.
-
-Sun Mar 20 01:39:48 2011  Tajima Akio <artonx@yahoo.co.jp>
-
-	* hash.c (ruby_setenv): check env process block size with OS ver.
-	* win32/win32.c: export rb_w32_osver for above patch.
-	* include/ruby/win32.h: declare rb_w32_osver for Win32 Libs.
-
-Sat Mar 19 18:35:05 2011  Tajima Akio <artonx@yahoo.co.jp>
-
-	* hash.c (ruby_setenv): calculate total env block size for win32.
-	* test/ruby/test_env.rb: add test for above patch.
-
-Sat Mar 19 17:14:46 2011  Tajima Akio <artonx@yahoo.co.jp>
-
-	* hash.c (ruby_setenv): checking with max process environment
-	  block size for Win32. 32767 for 2000/XP, 2003. if failed to
-	  read the block, then checking with 5120 for earlier Windows.
-
-Sat Mar 19 12:30:25 2011  Tanaka Akira  <akr@fsij.org>
-
-	* ext/openssl/ossl_x509revoked.c: parenthesize macro arguments.
-
-Fri Mar 18 20:44:36 2011  Tanaka Akira  <akr@fsij.org>
-
-	* ext/openssl/ossl_x509req.c: parenthesize macro arguments.
-
-Fri Mar 18 08:48:06 2011  Oleg Shaldybin  <oleg.shaldybin@gmail.com>
-
-	* lib/fileutils.rb (FileUtils::Entry_#copy_file): updated FileUtils.cp
-	  to still copy file permissions when :preserve is false (as cp does
-	  this even when -p isn't set).
-
-Fri Mar 18 00:59:38 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* ext/win32ole/extconf.rb (create_docfile): removed.  should not
-	  modify source directory unnecessarily, platform dependent
-	  documentation should be dealt with by rdoc.  [ruby-core:35495]
-
-Fri Mar 18 00:54:20 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* include/ruby/ruby.h (rb_funcall_passing_block): add prototype.
-	  a patch by James M. Lawrence at [ruby-core:35501]
-
-Wed Mar 17 06:23:31 2011  Tanaka Akira  <akr@fsij.org>
-
-	* ext/openssl/ossl_x509name.c: parenthesize macro arguments.
-
-Wed Mar 16 20:36:56 2011  Tanaka Akira  <akr@fsij.org>
-
-	* ext/socket/ipsocket.c (init_inetsock_internal): raise an error on
-	  listen(2) failure.
-	  reported by Xavier Shay.  [ruby-core:35505]
-
-Wed Mar 16 15:06:21 2011  Eric Hodel  <drbrain@segment7.net>
-
-	* ext/openssl/lib/openssl/buffering.rb (module OpenSSL): #flush should
-	  not change sync mode on exception.
-	* test/openssl/test_buffering.rb: added
-
-Wed Mar 16 13:45:28 2011  Eric Hodel  <drbrain@segment7.net>
-
-	* ext/openssl/lib/openssl/buffering.rb: de-nest Buffering module
-
-	* ext/openssl/lib/openssl/buffering.rb: add RDoc
-
-Wed Mar 16 08:40:39 2011  Tanaka Akira  <akr@fsij.org>
-
-	* ext/openssl/ossl_x509ext.c: parenthesize macro arguments.
-
-Tue Mar 15 18:34:27 2011  Tanaka Akira  <akr@fsij.org>
-
-	* ext/openssl/ossl_x509crl.c: parenthesize macro arguments.
-
-Tue Mar 15 09:49:03 2011  Shota Fukumori  <sorah@tubusu.net>
-
-	* test/misc/test_ruby_mode.rb (test_singleton_class): Skip for Pending.
-
-Mon Mar 14 21:20:44 2011  CHIKANAGA Tomoyuki  <nagachika00@gmail.com>
-
-	* test/ruby/test_require.rb (test_require_too_long_filename):
-	  increase path length, because MAXPATHLEN is defined as 4096 on linux.
-
-	* test/ruby/test_require.rb (test_require_path_home_1): ditto.
-
-	* test/ruby/test_require.rb (test_require_path_home_2): ditto.
-
-Mon Mar 14 19:54:37 2011  Tanaka Akira  <akr@fsij.org>
-
-	* ext/openssl/ossl_x509cert.c: parenthesize macro arguments.
-
-Sun Mar 13 18:11:28 2011  Tanaka Akira  <akr@fsij.org>
-
-	* ext/openssl/ossl_x509attr.c: parenthesize macro arguments.
-
-Sun Mar 13 16:07:58 2011  Shota Fukumori  <sorah@tubusu.net>
-
-	* lib/pstore.rb: Fix don't raise "nested transaction" when thread_safe
-	  is true. Patch by Masaki Matsushita (Glass_saga). [ruby-dev:43337]
-
-	* test/test_pstore.rb: Test for above.
-	  Patch by Masaki Matsushita (Glass_saga) [ruby-dev:43337]
-
-Sat Mar 12 04:12:41 2011  Tanaka Akira  <akr@fsij.org>
-
-	* ext/openssl/ossl_ssl_session.c: parenthesize macro arguments.
-
-Sat Mar 12 02:27:07 2011  Tadayoshi Funaba  <tadf@dotrb.org>
-
-	* ext/date/date_core.c ({d,dt}_lite_marshal_load): checks the given
-	  argument.
-
-Sat Mar 12 01:26:24 2011  Tadayoshi Funaba  <tadf@dotrb.org>
-
-	* ext/date/date_core.c: changed some directives.
-
-Sat Mar 12 01:16:02 2011  Tadayoshi Funaba  <tadf@dotrb.org>
-
-	* ext/date/date_core.c, ext/date/lib/*: moved rdoc descriptions.
-
-Sat Mar 12 00:06:24 2011  Tadayoshi Funaba  <tadf@dotrb.org>
-
-	* ext/date/lib: moved from lib.
-
-Fri Mar 11 23:32:38 2011  Tadayoshi Funaba  <tadf@dotrb.org>
-
-	* lib/date/delta*: removed undocumented delta.
-
-Fri Mar 11 18:42:43 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* lib/mkmf.rb (find_executable0): should exclude directories.
-
-Fri Mar 11 01:40:35 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* process.c (proc_getmaxgroups, proc_setmaxgroups): Process#maxgroups
-	  and Process#maxgroups= now raise NotImplementedError if the
-	  platform don't support supplementary groups concept.
-
-Fri Mar 11 01:25:03 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* process.c (get_sc_ngroups_max): return -1 if platform don't
-	  support NGROUPS_MAX.
-
-Thu Mar 10 22:28:15 2011  Tanaka Akira  <akr@fsij.org>
-
-	* ext/openssl/ossl_ssl.h: parenthesize macro arguments.
-
-Thu Mar 10 21:59:37 2011  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* parse.y (parser_encode_length): add exception as UTF8-MAC for
-	  magic comment's emacs newline specifier
-	  patched by James M. Lawrence [ruby-core:35476] fixes #4489
-
-Thu Mar 10 16:00:22 2011  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* parse.y (parser_encode_length): fix typo: the length of
-	  "-dos" and "-mac" is not 5 but 4.
-	  patched by James M. Lawrence [ruby-core:35476] fixes #4489
-
-Thu Mar 10 10:52:01 2011  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* test/ruby/test_require.rb: setting too long string to ENV causes
-	  Errno::EINVAL on Windows.  long path name errors may causes over
-	  about 1024 bytes, then limit it about 4000 bytes.
-
-Thu Mar 10 10:09:35 2011  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* lib/test/unit.rb (Test::Unit::Runner::Worker#read): fix for the case
-	  when IO#read or IO#gets returns nil.
-
-Thu Mar 10 07:12:03 2011  Ryan Davis  <ryand-ruby@zenspider.com>
-
-	* lib/rubygems*: Import rubygems 1.6.2 (release candidate @ 2026fbb5)
-	* test/rubygems: Ditto
-	* test/runner.rb: Added test to load path to fix test requires.
-
-Thu Mar 10 03:00:43 2011  Tanaka Akira  <akr@fsij.org>
-
-	* ext/openssl/ossl_ssl.c: parenthesize macro arguments.
-
-Wed Mar  9 23:51:26 2011  CHIKANAGA Tomoyuki  <nagachika00@gmail.com>
-
-	* test/ruby/test_io_m17n.rb (test_io_new_enc): "sjis" is now an alias
-	  of Windows-31J.
-
-Wed Mar  9 23:06:13 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* misc/ruby-mode.el (ruby-parse-partial): fix indent after aref.
-
-Wed Mar  9 12:50:24 2011  Aaron Patterson <aaron@tenderlovemaking.com>
-
-	* ext/psych/lib/psych/visitors/yaml_tree.rb: Rescue exceptions when
-	  people implement the method method. Thanks Lin Jen-Shin.
-	  [ruby-core:35255]
-
-	* test/psych/visitors/test_yaml_tree.rb: test for implementation of
-	  method method.
-
-Wed Mar  9 11:53:31 2011  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* enc/shift_jis.c: Change SJIS as an alias of Windows-31J.
-	  [ruby-dev:43027] fixes #4280
-
-	* enc/shift_jis.c: Add PCK as an alias of Windows-31J.
-
-Wed Mar  9 00:45:29 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* ext/extmk.rb: nmake substitutes all occurrences in macro.
-
-	* ext/extmk.rb: workaround for nmake.
-
-Tue Mar  8 23:49:45 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* process.c (proc_setgroups): cleanup.
-
-Tue Mar  8 23:40:30 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* test/misc/test_ruby_mode.rb: test for ruby-mode.el.
-
-Tue Mar  8 23:27:38 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* process.c (get_sc_ngroups_max): try to use NGROUPS_MAX at first if
-	  _SC_NGROUP_MAX is not defined.
-
-Tue Mar  8 23:10:16 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* misc/ruby-mode.el (ruby-parse-partial): fix for array in block.
-
-Tue Mar  8 21:44:49 2011  Tanaka Akira  <akr@fsij.org>
-
-	* ext/openssl/ossl_rand.c: parenthesize macro arguments.
-
-Tue Mar  8 16:45:31 2011  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* hash.c (ruby_setenv): MSDN says that Windows XP or earlier limits
-	  the total size of environment block to 5,120 chars.  and on such
-	  OS, putenv() causes SEGV.  So, ruby should limit the size of an
-	  environment variable to 5,120 bytes for workaround.
-
-Tue Mar  8 15:57:20 2011  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* test/rubygems/test_gem_spec_fetcher.rb
-	  (TestGemSpecFetcher#test_cache_dir_escapes_windows_paths): cache_dir
-	  may have driveletter and `:' for base of cache_dir itself, so need
-	  to skip it for checking.
-
-Tue Mar  8 12:30:06 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* misc/ruby-mode.el (ruby-deep-indent-paren-p, ruby-calculate-indent):
-	  do not apply deep-indent inside parens at the beginning of
-	  expressions.
-
-Tue Mar  8 09:32:48 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* common.mk (configure-ext, build-ext), ext/extmk.rb (extmake):
-	  support parallel-make under ext.
-
-Tue Mar  8 09:25:23 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* process.c (proc_setgroups): use getgrnam() if getgrnam_r() is
-	  not available.
-
-	* process.c: RARRAY_LEN() returns long int.
-
-Tue Mar  8 09:07:03 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* configure.in (RUBY_REPLACE_TYPE): enclose in quotes for multiple
-	  type names.
-
-Tue Mar  8 01:43:11 2011  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* process.c (get_sc_ngroups_max): define to wrap sysconf(3).
-	  this also supports Windows which doesn't have sysconf(3).
-
-	* process.c (maxgroups): use get_sc_ngroups_max.
-
-	* process.c (proc_setmaxgroups): ditto.
-
-Tue Mar  8 01:16:49 2011  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* gc.c (rb_objspace): an initializer must be a constant.
-
-Tue Mar  8 01:11:44 2011  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* process.c (maxgroups): cast because sysconf(3)'s return value is long.
-
-	* process.c (proc_setmaxgroups): ditto.
-
-	* process.c (proc_setgroups): cast because RARRAY_LEN() is long.
-
-Tue Mar  8 00:02:47 2011  Tanaka Akira  <akr@fsij.org>
-
-	* ext/openssl/ossl_pkey_rsa.c: parenthesize macro arguments.
-
-Mon Mar  7 22:59:39 2011  Shota Fukumori  <sorah@tubusu.net>
-
-	* lib/pstore.rb: Delete variable @transaction and fix #4474. Patch by
-	  Masaki Matsushita (Glass_saga).
-
-	* test/test_pstore.rb(test_thread_safe): Add test for #4474.
-
-Mon Mar  7 21:31:38 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* process.c (proc_setgroups): replace getgrnam() with getgrnam_r()
-	  because getgrnam() isn't thread safe.
-
-Mon Mar  7 20:49:12 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* process.c (proc_getmaxgroups, proc_setmaxgroups): reflect
-	  platform maxgroups limitation by default instead hardcoded 65536.
-
-Mon Mar  7 17:13:00 2011  Yukihiro Matsumoto  <matz@ruby-lang.org>
-
-	* gc.c (rb_gc_set_params): allow GC parameter configuration by
-	  environment variables.  based on a patch from funny-falcon at
-	  https://gist.github.com/856296, but honors safe level.
-
-Mon Mar  7 09:05:18 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* process.c: NUM2RLIM is defined but no getrlimit and setrlimit on
-	  mingw.
-
-Mon Mar  7 08:38:14 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* ext/date/date_core.c (DateTimeData): should not use bare 'long long'
-	  and 'long double', which are not defined by C89.
-
-	* ext/date/date_core.c (dt_lite_plus): get rid of overflow at casting
-	  down double to integer.
-
-Mon Mar  7 00:21:11 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* process.c (proc_getgroups): get rid of maxgroups dependency.
-	  ngroups can be calculated dynamically.
-
-Sun Mar  6 23:45:40 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* configure.in: rlim_t use standard RUBY_REPLACE_TYPE mechanism.
-
-Sun Mar  6 23:26:07 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* process.c (proc_setmaxgroups): added negative value check.
-	  This was suggested by Daniel Berger. Thanks Daniel!
-	  [ruby-core:35426][Bug#4467]
-
-Sun Mar  6 23:18:23 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* process.c (maxgroups, proc_setmaxgroups): increase max groups
-	  limitation up to 65536.
-
-Sun Mar  6 22:20:59 2011  Tanaka Akira  <akr@fsij.org>
-
-	* ext/openssl/ossl_pkey_ec.c: parenthesize macro arguments.
-
-Sun Mar  6 21:49:04 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* sample/list.rb (MyElem#initialize): initialize @head
-	  explicitly. Otherwise -W2 option makes following warning.
-	  "warning: instance variable @head not initialized".
-	  This issue was founded by Andrew Grimm. Thanks Andrew!
-	  [ruby-core:35435][Bug#4471]
-
-Sun Mar  6 05:21:41 2011  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* class.c: fix camelCase to snake_case in documentation code examples.
-	  patched by Andrew Grimm. fixes Bug #4469
-
-	* marshal.c: ditto.
-
-	* proc.c: ditto.
-
-	* sample/biorhythm.rb: ditto.
-
-	* vm_eval.c: ditto.
-
-	* vm_method.c: ditto.
-
-
-Sun Mar  6 03:22:27 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* io.c (io_cntl): use rb_thread_io_blocking_region() instead
-	  rb_thread_blocking_region().
-
-Sat Mar  5 22:54:36 2011  CHIKANAGA Tomoyuki  <nagachika00@gmail.com>
-
-	* include/ruby/intern.h: fix a typo of prototype declaration.
-	  rb_mutex_try_lock -> rb_mutex_trylock [ruby-dev:43213]
-
-Sat Mar  5 19:44:03 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* test/ruby/test_io.rb (TestIO#test_fcntl_lock): small clean up.
-
-Sat Mar  5 01:33:46 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* io.c (io_cntl, nogvl_io_cntl): IO.fcntl() and IO.ioctl()
-	  release GVL during calling kernel interface.
-	  Suggested by Eric Wong. [ruby-core:35417][Bug #4463]
-
-	* test/ruby/test_io.rb (TestIO#test_fcntl_lock): add new test for
-	  IO.fcntl().
-
-Fri Mar  4 23:09:12 2011  CHIKANAGA Tomoyuki  <nagachika00@gmail.com>
-
-	* test/testunit/test_parallel.rb
-	  (test_should_run_all_without_any_leaks): consider that the order of
-	  testcase could change. [ruby-dev:43300] [Bug #4466]
-
-Fri Mar  4 22:01:14 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* io.c (io_cntl): change 'cmd' type to int. ioctl and fcntl need to
-	  be passed int.
-	* io.c (rb_io_ctl): ditto.
-
-Fri Mar  4 21:10:40 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* configure.in: save warnflags. the patch is created by Eric Wong.
-	  [Bug #4465]
-
-Wed Mar  2 21:15:00 2011  Tanaka Akira  <akr@fsij.org>
-
-	* ext/openssl/ossl_pkey_dsa.c: parenthesize macro arguments.
-
-Thu Mar  3 22:10:26 2011  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* process.c (check_exec_redirect_fd, check_exec_redirect): raise
-	  ArgumentError if fd >= 3 on Windows because the feature is not
-	  supported.
-
-	* test/ruby/test_process.rb (test_execopts_redirect): remove meaningless
-	  argument.
-
-Thu Mar  3 21:21:42 2011  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* test/ruby/test_process.rb (test_execopts_redirect): redirecting fd
-	  >= 3 is not supported on Windows, so should not specify such options
-	  when calling spawn or others.
-
-Thu Mar  3 18:59:04 2011  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* string.c (rb_str_slice_bang): raise error when the string is frozen.
-
-Thu Mar  3 14:25:19 2011  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* strftime.c (STRFTIME): return 0 and ERANGE when precision is too
-	  large. [ruby-dev:43284] fixes #4456
-
-Thu Mar  3 00:46:51 2011  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* addr2line.c (uleb128): cast the value to unsigned long.
-
-	* addr2line.c (fill_lines): print error when lseek fails.
-
-Thu Mar  3 00:36:29 2011  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* lib/rexml/encoding.rb (REXML::Encoding#encoding=): store @encoding
-	  a String which means the name of the encoding.
-	  this partially revert r29646.
-
-	* lib/rexml/document.rb: follow above.
-
-	* lib/rexml/output.rb: ditto.
-
-	* lib/rexml/parsers/baseparser.rb: ditto.
-
-	* lib/rexml/source.rb: ditto.
-
-	* lib/rexml/xmldecl.rb: ditto.
-
-Wed Mar  2 23:19:56 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* string.c (str_byte_substr): return nil for negative length.
-
-Wed Mar  2 21:15:00 2011  Tanaka Akira  <akr@fsij.org>
-
-	* ext/openssl/ossl_pkey_dh.c: parenthesize macro arguments.
-
-Wed Mar  2 14:24:04 2011  Shota Fukumori  <sorah@tubusu.net>
-
-	* lib/test/unit/parallel.rb: Fix name from `inclement_io` to
-	  `increment_io`.
-
-Wed Mar  2 14:06:01 2011  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* string.c (rb_str_slice_bang): move treatments which is only needed
-	  when the result is not nil.
-
-Wed Mar  2 14:02:29 2011  Shota Fukumori  <sorah@tubusu.net>
-
-	* test/testunit/test_parallel.rb(TestParallel#spawn_runner):
-	  Fix outputting empty line in running test.
-
-	* test/testunit/tests_for_parallel/test_third.rb: Remove `sleep`
-
-Tue Mar  1 22:29:10 2011  Tanaka Akira  <akr@fsij.org>
-
-	* ext/openssl/ossl_pkey.h: parenthesize macro arguments.
-
-Tue Mar  1 22:02:35 2011  Shota Fukumori  <sorah@tubusu.net>
-
-	* lib/test/unit/parallel.rb: Fix number.
-
-Tue Mar  1 21:48:22 2011  Shota Fukumori  <sorah@tubusu.net>
-
-	* lib/test/unit/parallel.rb: For Windows.
-
-	* test/testunit/test_parallel.rb(TestParallelWorker#test_quit_in_test):
-	  Fix for above specification change.
-	* test/testunit/test_parallel.rb(TestParallel#spawn_runner):
-	  Fix outputting empty line in running test.
-
-Tue Mar  1 20:51:57 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* test/ruby/test_system.rb (TestSystem#test_system_at):
-	  remove tests for [bug#4396]. because we decided to reject this
-	  ticket.
-
-Tue Mar  1 19:46:19 2011  Tadayoshi Funaba  <tadf@dotrb.org>
-
-	* test/date/{test_date.rb,test_date_attr.rb}: [ruby-dev:43280]
-
-Tue Mar  1 18:40:38 2011  Ryan Davis  <ryan@YPCMC09457>
-
-	* lib/rubygems*: Import rubygems 1.6.0 (released version @ 58d8a0b9)
-	* test/rubygems: Ditto
-
-Tue Mar  1 16:22:22 2011  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* win32/win32.c: revert r30987 because it causes some failures in
-	  test-all, especially webrick.
-
-Tue Mar  1 15:59:53 2011  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* string.c (rb_str_byteslice): the resulted encoding should keep
-	  original encoding. this also fixes the encoding when the result
-	  shares internal string. [ruby-core:35376]
-
-Tue Mar  1 13:25:00 2011  Kenta Murata <mrkn@mrkn.jp>
-
-	* ext/bigdecimal/bigdecimal.c (VpMemAlloc): CVE-2011-0188.
-	  Fixes a bug reported by Drew Yao <ayao at apple.com>
-
-Tue Mar  1 10:34:39 2011  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* string.c (rb_str_byteslice): Add String#byteslice. [ruby-core:35376]
-
-Tue Mar  1 00:12:49 2011  Tajima Akio <artonx@yahoo.co.jp>
-
-	* include/ruby/win32.h: define WIN32 if neither _WIN64 nor WIN32
-	  defined. it forces to use push/pop for pack(4) pragma.
-
-Mon Feb 28 23:52:13 2011  CHIKANAGA Tomoyuki  <nagachika00@gmail.com>
-
-	* test/testunit/test_rake_integration.rb (test_with_rake_runner):
-	  use assert_in_out_err for suppress messages.
-
-Mon Feb 28 22:48:56 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* win32/win32.c (rb_w32_spawn): use shell if a commandline contain
-	  double-quote character.
-	* win32/win32.c (is_internal_cmd): similar, use shell if a commandline
-	  contain caret character.
-
-	* test/ruby/test_system.rb (TestSystem#test_system_at): fix
-	  wrong test case. if system() invoke a command by using shell,
-	  system() never return nil. Also, "" quotation must not appear
-	  twice in a command line.
-
-Mon Feb 28 17:36:57 2011  Tanaka Akira  <akr@fsij.org>
-
-	* ext/openssl/ossl_pkcs7.c: parenthesize macro arguments.
-
-Mon Feb 28 16:48:42 2011  Tanaka Akira  <akr@fsij.org>
-
-	* ext/openssl/ossl_pkcs12.c: parenthesize macro arguments.
-
-Mon Feb 28 16:28:15 2011  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* string.c (tr_trans): when the hash for multibyte repl is empty,
-	  tr is inverse mode, and a character doesn't much the table, the
-	  character should be replaced by last replacement. Bug #4449
-
-Mon Feb 28 16:38:56 2011  Tanaka Akira  <akr@fsij.org>
-
-	* ext/openssl/ossl_ocsp.c: parenthesize macro arguments.
-
-Mon Feb 28 13:02:15 2011  Danial Pearce <github@tigris.id.au>
-
-	* lib/tempfile.rb: Fix example file paths in docs for tempfile.
-	  https://github.com/ruby/ruby/pull/5
-
-Mon Feb 28 12:56:18 2011  URABE Shyouhei  <shyouhei@ruby-lang.org>
-
-	* ext/openssl/ossl_cipher.c (ossl_cipher_init): typo fix.
-	  https://github.com/ruby/ruby/pull/8
-
-Mon Feb 28 12:28:13 2011  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* ext/date/date_core.c (datetime_s_now): localtime() and localtime_r()
-	  required time_t pointer as 1st parameter, and tv_sec member of struct
-	  timeval is long.
-
-Mon Feb 28 11:57:40 2011  Shota Fukumori  <sorah@tubusu.net>
-
-	* test/testunit/test_parallel.rb: Temporally disable test on Windows.
-
-Mon Feb 28 07:28:35 2011  Shota Fukumori  <sorah@tubusu.net>
-
-	* lib/test/unit.rb(Test::Unit::Runner#after_worker_quit):
-	  method name more be natural English.
-
-	* lib/test/unit.rb(Test::Unit::Runner::Worker.launch):
-	  IO.sync doesn't need. Should use "b" for mode.
-
-Sun Feb 27 21:59:37 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* test/ruby/test_system.rb (TestSystem#test_system_redirect_win):
-	  add test for system().
-
-Sun Feb 27 18:00:09 2011  Shota Fukumori  <sorah@tubusu.net>
-
-	* lib/test/unit.rb: Refactoring; Worker never use Hash for internal
-	  storage.
-
-	* lib/test/unit.rb: Never use Kernel#spawn. Use IO.popen instead.
-
-Sun Feb 27 13:16:48 2011  Tanaka Akira  <akr@fsij.org>
-
-	* ext/openssl/ossl_ns_spki.c: parenthesize macro arguments.
-
-Sat Feb 26 17:07:53 2011  Tadayoshi Funaba  <tadf@dotrb.org>
-
-	* lib/date.rb: [Feature #4257]
-
-	* ext/date/extconf.rb: new
-
-	* ext/date/date_core.c: new
-
-Sat Feb 26 16:10:23 2011  Shota Fukumori  <sorah@tubusu.net>
-
-	* lib/test/unit.rb: --jobs-status won't puts over 2 lines.
-
-	* test/testunit/test_parallel.rb: Fix test for above.
-
-	* lib/test/*: refactoring.
-
-Sat Feb 26 07:10:05 2011  Aaron Patterson <aaron@tenderlovemaking.com>
-
-	* ext/psych/lib/psych/scalar_scanner.rb: fix parsing timezone's whose
-	  whose format is (+/-)hhmm.  Thanks Goncalo Silva!
-
-	* test/psych/test_scalar_scanner.rb: test for bug.
-
-Thu Feb 24 23:02:55 2011  Tanaka Akira  <akr@fsij.org>
-
-	* ext/openssl/ossl_hmac.c: parenthesize macro arguments.
-
-Thu Feb 24 22:53:10 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* common.mk (love): for the birthday.
-
-Thu Feb 24 22:51:54 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* vm.c (ruby_vm_destruct): run vm exit hooks after all objects are
-	  destructed.
-
-Thu Feb 24 14:40:33 2011  Shota Fukumori  <sorah@tubusu.net>
-
-	* ChangeLog (vim): Modeline for vim
-
-Thu Feb 24 13:39:25 2011  Shota Fukumori  <sorah@tubusu.net>
-
-	* common.mk: Use $RUNRUBY for worker process.
-
-	* lib/test/unit.rb: Fix bug.
-
-	* lib/test/unit.rb: @options[:ruby](@opts[:ruby]) is now Array.
-
-	* test/testunit/parallel.rb: Fix for above.
-
-Thu Feb 24 10:05:55 2011  Shota Fukumori  <sorah@tubusu.net>
-
-	* test/testunit/tests_for_parallel/misc.rb: Fix bug in r30947.
-
-	* lib/test/unit.rb, lib/test/unit/assertions.rb: For this test.
-
-Wed Feb 23 23:07:38 2011  Shota Fukumori  <sorah@tubusu.net>
-
-	* test/testunit/test_parallel.rb, test/testunit/parallel/*:
-	  Test for r30939.
-
-	* lib/test/unit.rb: For test.
-
-	* lib/test/parallel.rb: For test.
-
-	* lib/test/unit/testcase.rb: For test.
-
-Wed Feb 23 22:05:13 2011  Tanaka Akira  <akr@fsij.org>
-
-	* ext/openssl/ossl_engine.c: parenthesize macro arguments.
-
-Tue Feb 22 23:15:17 2011  Shota Fukumori  <sorah@tubusu.net>
-
-	* lib/test/unit.rb: Fix --ruby option doesn't effect.
-
-	* lib/test/unit.rb: Fix typo.
-
-Tue Feb 22 21:39:28 2011  Tanaka Akira  <akr@fsij.org>
-
-	* ext/openssl/ossl_digest.c: parenthesize macro arguments.
-
-Tue Feb 22 14:34:26 2011  Shota Fukumori  <sorah@tubusu.net>
-
-	* lib/test/unit.rb: Fix merging miss.
-
-Tue Feb 22 12:27:26 2011  Shota Fukumori  <sorah@tubusu.net>
-
-	* lib/test/unit.rb: Add new options; --jobs,-j,--ruby,--jobs-status,
-	  --no-retry.
-	  [Feature #4415] [ruby-dev:43226],[ruby-dev:43222],[ruby-core:35294]
-
-	* lib/test/unit/parallel.rb: Used at test/unit --jobs(-j) option.
-
-	* test/csv/test_serialization.rb: test/unit parallel running ready.
-
-	* test/rake/test_file_task.rb: test/unit parallel running ready.
-
-Tue Feb 22 06:09:10 2011  Eric Hodel  <drbrain@segment7.net>
-
-	* ext/syslog/syslog.c: Apply documentation patch from mathew murphy.
-	  [Bug #4149]
-
-Tue Feb 22 03:09:10 2011  Aaron Patterson <aaron@tenderlovemaking.com>
-
-	* ext/psych/lib/psych.rb: increase Psych to 1.1.0 for help with
-	  debugging.
-
-Tue Feb 22 03:04:46 2011  Aaron Patterson <aaron@tenderlovemaking.com>
-
-	* ext/psych/lib/psych/streaming.rb: refactor streaming methods to a
-	  module.
-	* ext/psych/lib/psych/stream.rb: extracted streaming specific methods
-	  to a module.
-	* ext/psych/lib/psych/json/stream.rb: JSON stream inherits from
-	  JSONTree and includes streaming methods.
-	* ext/psych/lib/psych/visitors/json_tree.rb: JSON does not support
-	  object references, so remove object reference testing when building
-	  JSON trees.
-
-Tue Feb 22 02:41:51 2011  Aaron Patterson <aaron@tenderlovemaking.com>
-
-	* ext/psych/lib/psych/visitors/yaml_tree.rb (accept): use Hash#key?
-	  when looking up object references to err on the side of cache
-	  misses.
-
-Mon Feb 21 10:58:39 2011  Aaron Patterson <aaron@tenderlovemaking.com>
-
-	* ext/psych/lib/psych/json/yaml_events.rb: refactoring JSON event
-	  handling methods to a module for reuse.
-	* ext/psych/lib/psych/json/tree_builder.rb: AST builder uses JSON
-	  event methods.
-	* ext/psych/lib/psych/json/stream.rb: stream emitter uses JSON event
-	  methods.
-
-Mon Feb 21 10:54:29 2011  Aaron Patterson <aaron@tenderlovemaking.com>
-
-	* ext/psych/lib/psych/json/stream.rb: do not emit custom tags in maps
-	  or sequences when emitting JSON.
-	* ext/psych/lib/psych/json/tree_builder.rb: do not emit custom tags in
-	  sequences when emitting JSON.
-	* test/psych/json/test_stream.rb: tests for custom stream emits.
-	* test/psych/test_json_tree.rb: tests for JSON emits.
-
-Mon Feb 21 10:05:10 2011  Aaron Patterson <aaron@tenderlovemaking.com>
-
-	* ext/psych/lib/psych/json/ruby_events.rb: DRY up ruby event handling
-	  for JSON.
-	* ext/psych/lib/psych/visitors/json_tree.rb: use ruby events module
-	* ext/psych/lib/psych/json/stream.rb: ditto
-
-Mon Feb 21 10:01:01 2011  Aaron Patterson <aaron@tenderlovemaking.com>
-
-	* ext/psych/lib/psych/json/stream.rb: fix JSON stream emits to use
-	  double quotes during stream.
-	* test/psych/json/test_stream.rb: tests to reflect changes.
-
-Mon Feb 21 00:38:56 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* test/ruby/test_system.rb (TestSystem#test_system_at):
-	  add testcase for bug4396.
-
-Sun Feb 20 19:59:32 2011  Tanaka Akira  <akr@fsij.org>
-
-	* ext/openssl/ossl_cipher.c: parenthesize macro arguments.
-
-Sun Feb 20 16:26:45 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* thread.c (exec_recursive): prevent temporary objects from GC.
-
-	* prevent temporary objects from GC, and should not use
-	  RSTRING_PTR() for function calls since it evaluates the argument
-	  a couple of times.
-
-Sun Feb 20 16:22:53 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* file.c (rb_file_flock): use rb_thread_io_blocking_region for the
-	  time being.
-
-Sun Feb 20 05:33:17 2011  Ryan Davis  <ryand-ruby@zenspider.com>
-
-	* lib/minitest/*.rb: Imported minitest 2.0.2 r6207.
-	* test/minitest/*: ditto
-
-Sun Feb 20 02:14:09 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* signal.c (sig_trap): avoid pthread_sigmask(xx, &mask, &mask) usage
-	  because FreeBSD don't permit it. If it's used, it behave as
-	  pthread_sigmask(xx, NULL, &mask).
-
-	* signal.c (init_sigchld): ditto.
-
-Sun Feb 20 00:46:51 2011  Tanaka Akira  <akr@fsij.org>
-
-	* ext/openssl/ossl_bn.c: parenthesize macro arguments.
-
-Sat Feb 19 22:37:42 2011  CHIKANAGA Tomoyuki  <nagachika00@gmail.com>
-
-	* vm_insnhelper.c (vm_check_if_namespace): guard temporary object
-	  from GC.
-
-Sat Feb 19 06:36:27 2011  Aaron Patterson <aaron@tenderlovemaking.com>
-
-	* lib/test/unit.rb: partial revert of r30849. [ruby-core:32864]
-
-	* test/testunit/test_rake_integration.rb: adding an integration test
-	  with the rake loader to prevent regressions.
-
-Fri Feb 18 19:31:31 2011  Shugo Maeda  <shugo@ruby-lang.org>
-
-	* lib/fileutils.rb (FileUtils::remove_entry_secure): there is a
-	  race condition in the case where the given path is a directory,
-	  and some other user can move that directory, and create a
-	  symlink while this method is executing.
-	  Reported by: Nicholas Jefferson <nicholas at pythonic.com.au>
-
-Fri Feb 18 00:28:39 2011  CHIKANAGA Tomoyuki  <nagachika00@gmail.com>
-
-	* compile.c (get_exception_sym2type): guard temporary object from GC.
-
-Thu Feb 17 23:54:29 2011  CHIKANAGA Tomoyuki  <nagachika00@gmail.com>
-
-	* iseq.c (prepare_iseq_build): initialize iseq_compile_data::err_info
-	  with nil. this fix exception in rb_iseq_load().
-
-Thu Feb 17 22:32:35 2011  CHIKANAGA Tomoyuki  <nagachika00@gmail.com>
-
-	* test/ruby/test_marshal.rb (test_marshal_dump_extra_iv):
-	  fix a typo of local variable. [Bug #3720] [ruby-dev:42083]
-
-Thu Feb 17 21:32:53 2011  Tanaka Akira  <akr@fsij.org>
-
-	* ext/openssl/ossl.h: parenthesize macro arguments.
-
-Wed Feb 16 20:37:48 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* eval_jump.c (rb_exec_end_proc): changed at_exit and END proc
-	  evaluation order. [Bug #4400] [ruby-core:35237]
-	* eval_jump.c (rb_mark_end_proc): ditto.
-
-	* test/ruby/test_beginendblock.rb (TestBeginEndBlock#test_nested_at_exit):
-	  added a test for nested at_exit.
-	* test/ruby/test_beginendblock.rb (TestBeginEndBlock#test_beginendblock):
-	  changed the test to adopt new spec.
-
-Wed Feb 16 20:17:06 2011  Tanaka Akira  <akr@fsij.org>
-
-	* ext/openssl/openssl_missing.h: parenthesize macro arguments.
-
-Tue Feb 15 21:37:45 2011  Tanaka Akira  <akr@fsij.org>
-
-	* ext/gdbm/gdbm.c: parenthesize macro arguments.
-
-Tue Feb 15 20:34:53 2011  Tanaka Akira  <akr@fsij.org>
-
-	* array.c (ary_join_1): fix array size.
-
-Tue Feb 15 19:43:23 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* configure.in: fix and resubmit r30621. [ruby-dev:43203]
-
-Tue Feb 15 15:41:30 2011  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* array.c (array_join): copy the encoding of the first element as
-	  an initial encoding.
-
-	* array.c (array_join_0): ditto.
-
-	* array.c (array_join_1): ditto.
-
-	* array.c (inspect_ary): ditto.
-
-	* array.c (array_join_1): add an argument to check the appending is
-	  first one or not.
-
-Tue Feb 15 15:40:53 2011  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* hash.c (inspect_i): copy the encoding of the first key as
-	  an initial encoding.
-
-Mon Feb 14 15:00:16 2011  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* array.c (inspect_ary): don't taint the inspected result of a
-	  recursive array.
-
-Tue Feb 15 15:43:29 2011  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* encoding.c (rb_enc_compatible): change the rule for empty strings:
-	  remove the special treatment of the US-ASCII encoded empty string.
-	  Now Encoding.compatible? usually respect the encoding of the
-	  receiver.
-
-Tue Feb 15 15:39:37 2011  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* string.c (rb_enc_cr_str_buf_cat): remove special treatment of
-	  ASCII-8BIT receivers.
-
-	* string.c (str_gsub): set initial encoding of the buffer as the
-	  same of the receiver. [ruby-core:35141]
-
-Tue Feb 15 09:49:33 2011  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* test/ruby/test_system.rb (TestSystem#test_system_at): use findstr
-	  command instead of find command, because the latter is confusing
-	  another famous Unix command.
-
-Mon Feb 14 23:01:19 2011  CHIKANAGA Tomoyuki  <nagachika00@gmail.com>
-
-	* thread.c (rb_thread_io_blocking_region): reset th->waiting_fd
-	  after blocking region, because remaining waiting_fd might
-	  cause unnecessary IOError.
-
-Mon Feb 14 21:06:50 2011  URABE Shyouhei  <shyouhei@ruby-lang.org>
-
-	* configure.in: revert r30621.  That revision introduced mkmf test
-	  failures and it turned out to be OK to revert. [ruby-dev:43203]
-
-Mon Feb 14 21:04:01 2011  Tanaka Akira  <akr@fsij.org>
-
-	* ext/fiddle/conversions.h: parenthesize macro arguments.
-
-Mon Feb 14 18:41:47 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* win32/setup.mak (USE_RUBYGEMS): fixed r30835. It didn't work on
-	  mswin32 port. If you changed win32/configure.bat, you should change
-	  setup.mak too.
-
-Mon Feb 14 17:28:34 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* test/ruby/test_system.rb (TestSystem#test_system_at):
-	  added test. [ruby-core:35218] (#4393)
-
-Mon Feb 14 13:15:35 2011  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* win32/win32.c (is_internal_cmd): if the first char of prog is '@',
-	  execute it via shell.  [ruby-core:35218] (#4393)
-
-Mon Feb 14 10:33:45 2011  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* lib/test/unit.rb: revert r30863, because it causes too many noise.
-
-Mon Feb 14 07:34:55 2011  Tanaka Akira  <akr@fsij.org>
-
-	* ext/curses/curses.c: parenthesize macro arguments.
-
-Sun Feb 13 19:41:47 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* lib/test/unit.rb (Test::Unit::RequireFiles#non_options): skip
-	  test suites failed to load instead of mere messages.
-
-Sun Feb 13 09:56:44 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* test/openssl/test_config.rb (OpenSSL#test_freeze): fix error
-	  message assertion.
-
-	* test/io/nonblock/test_flush.rb (TestIONonblock#flush_test):
-	  return true to finish the test.
-
-	* test/syck/test_string.rb (Syck::TestString#test_non_binary_string):
-	  use assert_not instead of refute, unless required minitest
-	  explicitly.
-
-	* test/test_prime.rb (TestPrime::sieve.Integer): ditto.
-
-	* test/xmlrpc/webrick_testing.rb (WEBrick_Testing#start_server):
-	  catch IOError when server socket was closed.
-
-Sun Feb 13 07:39:51 2011  Yukihiro Matsumoto  <matz@ruby-lang.org>
-
-	* enum.c (enum_inject): typo fixed. a patch from Gaku Ueda in
-	  [ruby-core:35216].
-
-Sun Feb 13 00:48:47 2011  Tadayoshi Funaba  <tadf@dotrb.org>
-
-	* lib/date.rb (Date#===): [ruby-core:35127]
-
-Sun Feb 13 00:29:18 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* lib/test/unit.rb (Test::Unit::Options#process_args): always
-	  return options.
-
-	* lib/test/unit.rb (Test::Unit::RequireFiles#non_options): return
-	  if any test case get loaded.
-
-	* lib/test/unit.rb (Test::Unit::AutoRunner#initialize): do not add
-	  default directory if it is nil.
-
-	* lib/test/unit.rb (Test::Unit::AutoRunner#process_args): return
-	  true if any test cases to run.
-
-Sat Feb 12 23:17:43 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* lib/test/unit.rb (assert_include): add alias.
-
-Sat Feb 12 14:44:20 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* thread.c (rb_thread_io_blocking_region): new function to run
-	  blocking region with GIL released, for fd.
-
-	* thread.c (rb_thread_fd_close): implement.  [ruby-core:35203]
-
-	* vm.c (th_init): rename from th_init2.
-
-Sat Feb 12 14:41:36 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* lib/test/unit.rb (Test::Unit::AutoRunner#initialize): use
-	  default_dir if no test case given.
-
-	* lib/test/unit.rb (Test::Unit::Runner): rename from Test::Unit::Mini.
-
-	* lib/test/unit.rb (Test::Unit::GlobOption#non_options): run tests
-	  under base directory if no argument given.
-
-Sat Feb 12 08:03:12 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* test/ruby/test_settracefunc.rb (TestSetTraceFunc): ensure to use
-	  method_added hook defined in Module.
-
-Sat Feb 12 01:04:02 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* ruby.c (proc_options): enable rubygems if --gem option is given.
-
-	* ruby.c (process_options): load rubygems if it is disabled but
-	  --gem option is given.
-
-Fri Feb 11 23:27:50 2011  Yuki Sonoda (Yugui)  <yugui@yugui.jp>
-
-	* ruby.c (proc_options): add --gem=enabled as an alias of
-	  --enable=gems and --gem=disabled as an alias of --disable=gems.
-	  Gem named "enabled" or "disabled" has already been reserved
-	  legitimately for this purpose.
-
-Fri Feb 11 23:17:04 2011  Tanaka Akira  <akr@fsij.org>
-
-	* ext/dl/cfunc.c: parenthesize macro arguments.
-
-Fri Feb 11 21:41:53 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* bin/testrb, test/runner.rb, lib/test/unit.rb: improve backward
-	  compatibility.
-
-Fri Feb 11 19:45:26 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* eval.c (ruby_cleanup): use rb_ary_free to free internal object.
-
-	* gc.h (RUBY_FREE_UNLESS_NULL): get rid of double free.
-	  [ruby-core:35192]
-
-Fri Feb 11 16:57:03 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* test/ruby/test_transcode.rb (test_from_cp50221): fix wrong
-	  assertion and move back.
-
-Fri Feb 11 14:33:18 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* lib/test/unit/assertions.rb (assert_no_match): alias for
-	  backward compatibility.
-
-Fri Feb 11 12:06:48 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* ruby.c (add_gems, require_libraries, proc_options): add
-	  --require and --gem options.
-
-Fri Feb 11 12:03:24 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* configure.in (rubygems): add --disable-rubygems option.
-
-Fri Feb 11 11:39:03 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* template/fake.rb.in (CROSS_COMPILING): get rid of NameError.
-
-Thu Feb 10 23:12:34 2011  Tanaka Akira  <akr@fsij.org>
-
-	* ext/dl/dl.h: parenthesize macro arguments.
-
-Wed Feb  9 23:11:27 2011  Tanaka Akira  <akr@fsij.org>
-
-	* ext/pty/pty.c: parenthesize macro arguments.
-
-Tue Feb  8 11:47:11 2011  Loren Sands-Ramshaw  <lorensr@gmail.com>
-
-	* array.c: documentation clarification in rotate, rotate!,
-	  index, and rindex. [ruby-core:35144]
-
-Wed Feb  9 09:45:43 2011  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* test/rdoc/test_rdoc_encoding.rb: remove unnecessary (and wrong)
-	  platform-dependent hacks.
-
-Wed Feb  9 00:47:18 2011  Tanaka Akira  <akr@fsij.org>
-
-	* ext/etc/etc.c: parenthesize macro arguments.
-
-Tue Feb  8 19:38:00 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* misc/ruby-mode.el (ruby-expr-beg): fix for invalid nest errors.
-
-Tue Feb  8 19:22:59 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* configure.in (AC_MSG_CHECKING): fixed typo. the patch is
-	  created by Benoit Daloze. Thanks a lot. [Bug #4384][ruby-core:35148]
-
-Tue Feb  8 16:04:03 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* io.c (rb_io_s_sysopen): use NUM2MODET() instead NUM2UINT().
-
-Tue Feb  8 15:59:23 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* process.c (rb_run_exec_options_err): use MODET2NUM() instead
-	  LONG2NUM().
-
-Tue Feb  8 13:59:56 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* configure.in: revert r30725. Now we have proper runtime fallback.
-	  Therefore, no need compile time disabling. (see r30762).
-
-Tue Feb  8 01:00:21 2011  CHIKANAGA Tomoyuki  <nagachika00@gmail.com>
-
-	* process.c (proc_setgroups): add GC guard to prevent intermediate
-	  variable from GC.
-
-Tue Feb  8 00:56:33 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* misc/ruby-mode.el (ruby-expr-beg, ruby-in-here-doc-p): tell
-	  singleton class definitions from here documents.
-
-	* misc/ruby-mode.el (ruby-expr-beg, ruby-parse-partial): keyword
-	  followed by colon is label.
-
-Mon Feb  7 22:56:16 2011  CHIKANAGA Tomoyuki  <nagachika00@gmail.com>
-
-	* lib/benchmark.rb (Benchmark#bmbm): use ensure clause instead of
-	  Object#tap to restore STDOUT.sync.
-
-Mon Feb  7 22:34:20 2011  Tanaka Akira  <akr@fsij.org>
-
-	* lib/net/http.rb (Net::HTTP#connect): support SNI (Server Name
-	  Indication) for HTTPS.  [ruby-dev:43164]
-	  http://stackoverflow.com/questions/4685736/openssl-server-name-indication-support-in-ruby
-
-Mon Feb  7 16:05:32 2011  Eric Hodel  <drbrain@segment7.net>
-
-	* lib/rdoc: Upgrade to RDoc 3.5.3  Fixes [Bug #4376]
-
-Mon Feb  7 11:46:59 2011  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* common.mk (rdoc): add --encoding=UTF-8; ruby's rdoc must be UTF-8.
-
-Mon Feb  7 10:21:50 2011  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* test/rdoc/test_rdoc_options.rb (TestRDocOptions#test_check_files):
-	  there is no easy way to create owner unreadable file on Windows.
-	  So, skip the test.
-
-Sun Feb  6 13:48:29 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* ext/json/lib/json/common.rb (JSON::MissingUnicodeSupport.iconv):
-	  should not drop rest of the result.  use Iconv.conv instead.
-
-Sun Feb  6 12:46:02 2011  Eric Hodel  <drbrain@segment7.net>
-
-	* string.c (gsub): Ensure result encoding is the same as input
-	  encoding.  [Bug #4340].
-
-Sun Feb  6 12:18:25 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* parse.y (words, qwords): dispatch array events.  based on a
-	  patch from Michael Edgar.  [Bug #4365].
-
-Sun Feb  6 12:12:59 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* test/fileutils/fileasserts.rb (FileAssertions): separate module.
-
-Sun Feb  6 11:29:23 2011  Tanaka Akira  <akr@fsij.org>
-
-	* ext/dbm/dbm.c: parenthesize macro arguments.
-
-Sat Feb  5 22:01:59 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* lib/test/unit/assertions.rb (Test::Unit::Assertions#assert):
-	  revert r30796. r30797 and r30798 are an alternative fix.
-	  [ruby-dev:43174]
-
-Sat Feb  5 21:47:09 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* parse.y (mlhs_basic): include mlhs_post for ripper.  a patch
-	  from Michael Edgar at [ruby-core:35078].
-
-Sat Feb  5 21:22:21 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* lib/test/unit/assertions.rb (assert_block): move from
-	  test/fileutils/fileasserts.rb.
-
-	* test/fileutils/fileasserts.rb (assert_block): pass arguments
-	  as-is.  [ruby-dev:43174]
-
-Sat Feb  5 16:47:54 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* lib/test/unit/assertions.rb (Test::Unit::Assertions#assert):
-	  msg can be passed nil. [Bug #4371] [ruby-dev:43174]
-
-Sat Feb  5 15:18:25 2011  Eric Hodel  <drbrain@segment7.net>
-
-	* lib/rdoc: Upgrade to RDoc 3.5.2
-
-Sat Feb  5 12:05:27 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* ext/syck/rubyext.c (syck_node_init_copy): SyckNode is not
-	  copiable.  [ruby-core:35094]
-
-Sat Feb  5 11:48:47 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* ext/openssl/ossl_cipher.c (ossl_cipher_alloc): leave data ptr
-	  NULL.
-
-	* ext/openssl/ossl_cipher.c (ossl_cipher_new, ossl_cipher_initialize):
-	  allocate internal structure.  [ruby-core:35094]
-
-	* ext/openssl/ossl_cipher.c (ossl_cipher_copy): ditto.
-
-Sat Feb  5 11:29:10 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* ext/json/parser/parser.h (GET_PARSER): raise TypeError.
-
-	* ext/json/parser/parser.rl (cParser_initialize): ditto.
-
-	* ext/json/parser/parser.h (GET_PARSER): check if initialized.
-	  [ruby-core:35079]
-
-	* ext/json/parser/parser.rl (cParser_initialize): ditto.
-
-Sat Feb  5 10:09:31 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* load.c (rb_get_expanded_load_path): always expand load paths.
-
-Sat Feb  5 09:38:08 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* transcode.c (encoded_dup): extract.
-
-Sat Feb  5 03:37:47 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* lib/fileutils.rb (FileUtils::LowMethods): make low level methods
-	  in NoWrite and DryRun to do nothing.  [ruby-dev:43129]
-
-	* test/fileutils/fileasserts.rb: add message arguments.
-
-	* test/fileutils/fileasserts.rb (Test::Unit::Assertions#assert_block):
-	  show the given message.
-
-Sat Feb  5 02:09:39 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* parse.y (lex_getline, parser_set_encode): set encoding of lines
-	  in SCRIPT_LINES__ as source encoding.  [ruby-dev:43168]
-
-Sat Feb  5 02:08:37 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* vm.c (ruby_thread_data_type): add prefix.
-
-Sat Feb  5 00:59:54 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* vm_core.h (GetThreadPtr): use TypedData_Get_Struct() instead
-	  CoreDataFromValue() because we need type check. Otherwise,
-	  type mismatch can cause segmentation fault crash.
-	  [ruby-core:35086] [Ruby 1.9-Bug#4367]
-
-	* vm.c (thread_data_type): remove static.
-
-Fri Feb  4 19:14:27 2011  Tanaka Akira  <akr@fsij.org>
-
-	* enc/trans/utf8_mac.trans: parenthesize macro arguments.
-
-Fri Feb  4 12:11:51 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* string.c (str_utf8_nth): fixed a condition of optimized lead
-	  byte counting. [Bug #4366][ruby-dev:43170]
-
-Fri Feb  4 01:50:13 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* string.c (count_utf8_lead_bytes_with_word): wrote function
-	  comments.
-
-Fri Feb  4 00:14:55 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* ext/zlib/zlib.c (gzfile_reader_get_unused): no need to dup
-	  before rb_str_resurrect.
-
-Thu Feb  3 20:04:44 2011  Tanaka Akira  <akr@fsij.org>
-
-	* ext/curses/curses.c (CHECK): unused macro removed.
-
-Thu Feb  3 18:33:26 2011  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* ext/zlib/zlib.c (gzfile_reader_get_unused): use rb_str_resurrect
-	  because gz->z.input is hidden string. [ruby-core:35057]
-
-Thu Feb  3 16:34:10 2011  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* enc/shift_jis.c (code_to_mbc): cast as int from the subtraction of
-	  pointers.
-
-	* enc/utf_16le.c (utf16le_mbc_enc_len): use ptrdiff_t.
-
-	* enc/utf_32be.c (utf32be_left_adjust_char_head): ditto.
-
-	* enc/utf_32le.c (utf32le_left_adjust_char_head): ditto.
-
-Thu Feb  3 16:31:43 2011  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* include/ruby/missing.h: don't use HAVE_STDDEF_H because it never
-	  defined by configure though configure.bat defines it.
-
-	* include/ruby/ruby.h: move include stddef.h to defines.h
-
-	* include/ruby/defines.h: ditto.
-
-Wed Feb  2 20:25:04 2011  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* include/ruby/encoding.h (rb_enc_step_back): cast 4th argument 'n'
-	  as int because Ruby usually treats length value as long but
-	  onigenc_step_back's 4th argument is int.
-
-Thu Feb  3 07:20:46 2011  Aaron Patterson <aaron@tenderlovemaking.com>
-
-	* ext/psych/lib/psych/visitors/to_ruby.rb: use Regexp::NOENCODING
-	  rather than magic number.
-
-	* ext/syck/lib/syck/rubytypes.rb: ditto
-
-Thu Feb  3 07:16:11 2011  Aaron Patterson <aaron@tenderlovemaking.com>
-
-	* re.c (Init_Regexp): added a constant for ARG_ENCODING_NONE
-	  [ruby-core:35054]
-
-	* test/ruby/test_regexp.rb: corresponding test.
-
-Thu Feb  3 07:02:16 2011  Aaron Patterson <aaron@tenderlovemaking.com>
-
-	* ext/psych/lib/psych/visitors/to_ruby.rb: ARG_ENCODING_NONE regular
-	  expressions can round trip. [ruby-core:34969]
-
-	* test/psych/test_yaml.rb: test for ARG_ENCODING_NONE regex
-
-	* ext/sych/lib/syck/rubytypes.rb: ARG_ENCODING_NONE regular
-	  expressions can round trip.
-
-	* test/syck/test_yaml.rb: test for ARG_ENCODING_NONE regex
-
-Wed Feb  2 17:09:22 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* io.c (rb_io_fdatasync): Use fsync(2) if the underlying
-	  operating system does not support fdatasync(2).
-
-Wed Feb  2 14:51:08 2011  Eric Hodel  <drbrain@segment7.net>
-
-	* lib/rdoc/markup/to_tt_only.rb: commit miss
-	* test/rdoc/test_rdoc_markup_to_tt_only.rb: ditto
-	* test/rdoc/test_rdoc_single_class.rb: ditto
-
-Wed Feb  2 09:27:53 2011  Eric Hodel  <drbrain@segment7.net>
-
-	* lib/rdoc: Upgrade to RDoc 3.5.1
-
-Wed Feb  2 00:30:43 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* include/ruby/st.h (st_table): Added comment why we need __extension__.
-
-Tue Feb  1 20:45:44 2011  Tanaka Akira  <akr@fsij.org>
-
-	* enc/encdb.c: parenthesize macro arguments.
-
-Tue Feb  1 15:12:26 2011  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* test/ruby/test_require.rb (TestRequire#test_require_with_unc):
-	  use ``127.0.0.1'' instead of ``localhost'' as host name, because
-	  XP or earlier cannot resolv it as NBT hostname.
-
-Tue Feb  1 13:20:39 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* test/benchmark/test_benchmark.rb (#capture_bench_output):
-	  Added explicit sleep. Windows have imprecise time support.
-	  Thus Tms.new.Add!{} may be or may be not equal 0. The
-	  test failure started since r30747.
-
-Tue Feb  1 11:03:47 2011  Ryan Davis  <ryan@lust.local>
-
-	* lib/rubygems*: Import rubygems 1.5.0 (released version @ 1fb59d0)
-	* test/rubygems: Ditto
-
-Tue Feb  1 08:01:39 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* ext/io/console/console.c (console_set_winsize): new method to set
-	  console size.  [EXPERIMENTAL]
-
-	* ext/io/console/console.c (console_winsize): use GetWriteFD.
-
-Tue Feb  1 02:28:14 2011  Masaya Tarui  <tarui@ruby-lnag.org>
-
-	* include/ruby/win32.h, win32/win32.c: add rb_w32_inet_ntop.
-	  inet_ntop's minimum supported client is Vista.
-
-Tue Feb  1 00:10:30 2011  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* lib/benchmark.rb: fix benchmark to work with current ruby.
-	  patched by Benoit Daloze [ruby-core:33846] [ruby-dev:43143]
-	  merged from https://github.com/eregon/ruby/commits/benchmark
-
-	*  lib/benchmark (Report#width): update documentation
-	*  lib/benchmark: document the return value of #benchmark and the
-	   :list attribute in Report
-	*  lib/benchmark (Tms#format): rename variables, use String#%
-	   instead of Kernel.format
-	*  lib/benchmark: remove undocumented Benchmark::times (an alias
-	   of Process::times used twice)
-	*  lib/benchmark (#benchmark): use label_width for the caption
-	*  lib/benchmark (Tms#initialize): rename variables
-	*  lib/benchmark: allow title to not be a String and call #to_s
-	*  lib/benchmark (Benchmark#bm): return an Array of the times with
-	   the labels
-	*  lib/benchmark: correct output for Benchmark#bmbm
-	   (remove the extra space)
-	*  lib/benchmark: add a few tests for Benchmark::Tms output
-	*  lib/benchmark: improve style (enumerators, ljust, unused vars)
-	*  lib/benchmark: add spec about output and return value
-	*  lib/benchmark: improve basic style and consistency
-	   no parenthesis for print and use interpolation instead of printf
-	*  lib/benchmark: remove unnecessary conversions and variables
-	*  lib/benchmark: correct indentation
-	*  lib/benchmark: rename the FMTSTR constant and variable to FORMAT
-	*  lib/benchmark: remove useless exception
-
-	*  test/benchmark: remove unused variable warnings
-
-Mon Jan 31 23:27:23 2011  CHIKANAGA Tomoyuki  <nagachika00@gmail.com>
-
-	* node.c (add_id): remove duplicated rb_id2str() call.
-
-Sun Jan 30 17:19:46 2011  Tanaka Akira  <akr@fsij.org>
-
-	* missing/langinfo.c: parenthesize macro arguments.
-
-Mon Jan 31 21:57:39 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* configure.in: revert r30698.
-
-Mon Jan 31 21:32:44 2011  CHIKANAGA Tomoyuki  <nagachika00@gmail.com>
-
-	* thread.c (thread_start_func_2): check deadlock condition before
-	  release thread stack. fix memory violation when deadlock detected.
-	  reported by Max Aller. [Bug #4009] [ruby-core:32982]
-
-Mon Jan 31 14:45:47 2011  Yuki Sonoda (Yugui)  <yugui@yugui.jp>
-
-	* lib/irb/locale.rb (IRB::Locale::#search_file):
-	  Gem might be undefined if --disable-gems. [ruby-core:34990]
-
-Mon Jan 31 12:26:14 2011  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* addr2line.c: suppressed shorten-64-to-32 warnings.
-	* regcomp.c: ditto.
-	* regexec.c: ditto.
-	* regint.h: ditto.
-	* regparse.c: ditto.
-	* regparse.h: ditto.
-	* time.c: ditto.
-	* variable.c: ditto.
-
-Mon Jan 31 04:45:12 2011  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* array.c (rb_ary_uniq_bang): call ARY_SET_LEN(ary, 0) before
-	  ary_resize_capa because ary_resize_capa expects resized length is
-	  smaller than current array length. call rb_ary_unshare before
-	  ary_resize_capa because ary_resize_capa lost the reference to
-	  original shared array. [ruby-core:34997]
-
-Sun Jan 30 17:19:46 2011  Tanaka Akira  <akr@fsij.org>
-
-	* missing/crypt.c: parenthesize macro arguments.
-
-Sun Jan 30 16:40:27 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* test/rubygems/test_gem_security.rb (TestGemSecurity): valid only
-	  if OpenSSL is available.
-
-	* test/dl/test_dl2.rb (TestDL#test_sin): math functions do not
-	  work on x86_64 due to the design of DL2.
-
-	* test/dl/test_func.rb (DL::TestFunc#test_{sinf,sin): ditto.
-
-Sun Jan 30 16:09:22 2011  Tanaka Akira  <akr@fsij.org>
-
-	* strftime.c (rb_strftime_with_timespec): %G produces 4 digits.
-
-Sun Jan 30 15:13:19 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* enc/emacs_mule.c (emacsmule_islead): 7bit range is also leading
-	  byte.
-
-Sun Jan 30 13:03:16 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* hash.c (rb_hash_fetch_m): use useful message for longer key, not a
-	  nonsense id value.
-
-	* string.c (rb_str_ellipsize): new function to ellipsize a string.
-
-	* include/ruby/encoding.h (rb_enc_step_back): new function to step
-	  back n characters.
-
-Sun Jan 30 12:53:38 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* enc/emacs_mule.c (emacsmule_islead): fix inverse condition.
-
-Sun Jan 30 09:37:25 2011  Yutaka Kanemoto  <kanemoto@ruby-lang.org>
-
-	* io.c (struct argf): char behaves like an unsigned char
-	  by default on AIX.
-
-Sun Jan 30 08:02:55 2011  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* configure.in: Mac OS X wrongly reports it has fdatasync(3).
-
-Sun Jan 30 03:29:47 2011  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* ext/openssl/ossl_bn.c (GetBNPtr): add missing nil case.
-	  patched by Martin Bosslet. [ruby-core:34987]
-
-Sun Jan 30 01:02:28 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* include/ruby/ruby.h: Added NUM2MODET() and MODET2NUM() default
-	  definition.
-	  Because r30686 introduced win32 build failure.
-
-Sat Jan 29 22:16:26 2011  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* array.c (rb_ary_join): [].join.encoding must be US-ASCII.
-	  [ruby-list:47790]
-
-Sat Jan 29 20:22:39 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* benchmark/driver.rb (BenchmarkDriver#measure): Show command line
-	  when abnormal exiting occur.
-
-Sat Jan 29 10:53:16 2011  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* vm_insnhelper.c (vm_get_ev_const): no-scope reference to toplevel
-	  private constant has been prohibited incorrectly.
-
-	* test/ruby/test_module.rb (test_toplevel_private_constant): add a
-	  test for above.
-
-Sat Jan 29 08:43:23 2011  Ryan Davis  <ryand-ruby@zenspider.com>
-
-	* lib/rubygems*: Import rubygems 1.5.0 (release candidate @ 09893d9)
-	* test/rubygems: Ditto
-
-Sat Jan 29 02:02:37 2011  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* variable.c (rb_mod_const_of, sv_i): Module#constant should exclude
-	  private constants.  see [ruby-core:32912].
-
-	* test/ruby/test_module.rb (test_constants_with_private_constant): add
-	  a test for above.
-
-Sat Jan 29 01:36:41 2011  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* variable.c (rb_const_set): const_set should preserve constant
-	  visibility.  see [ruby-core:32912].
-
-	* test/ruby/test_module.rb: add a test for above.
-
-Sat Jan 29 01:24:57 2011  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* compile.c (NODE_CLASS, NODE_MODULE), insns.def (defineclass): raise
-	  an exception when "class Foo::Bar" is evaluated and Foo::Bar is
-	  private.  To implement this, define_type of "defineclass" is added
-	  so that the instruction can distinguish whether the class definition
-	  is scoped (class Foo::Bar) or not (class Bar).
-
-	* test/ruby/test_class.rb (test_redefine_private_class),
-	  test/ruby/test_module.rb
-	  (test_define_module_under_private_constant): add tests for above.
-
-Sat Jan 29 01:19:17 2011  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* constant.h, variable.c: to ensure compatibility, rb_const_get_* must
-	  not raise an exception even when the constant is private.  Instead,
-	  rb_public_const_get_* and rb_public_const_defined_* are introduced,
-	  which raise an exception when the referring constant is private.
-	  see [ruby-core:32912].
-
-	* vm_insnhelper.c (vm_get_ev_const): use rb_public_const_get_* instead
-	  of rb_const_get_* to follow the constant visibility when user code
-	  refers a constant.
-
-	* test/ruby/test_marshal.rb (test_marshal_private_class): add a test.
-	  This test had failed because of incompatibility of rb_const_get.
-
-Sat Jan 29 00:30:44 2011  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* variable.c (set_const_visibility): fix typo.  a patch from Tomoyuki
-	  Chikanaga in [ruby-core:32919].
-
-Fri Jan 28 23:20:28 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* test/gdbm/test_gdbm.rb (TestGDBM#test_s_open_no_create,
-	  TestGDBM2#test_writer_open_notexist): We only need to skip libgdbm
-	  1.8.0, not all 1.8.x. 1.8.1 or later don't have GDBM_WRITER sickness.
-
-Fri Jan 28 21:56:57 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* ext/dbm/extconf.rb: Added new header places for Fedora13.
-
-Fri Jan 28 21:49:30 2011  Tanaka Akira  <akr@fsij.org>
-
-	* ext/zlib/zlib.c: parenthesize macro arguments.
-
-Fri Jan 28 17:47:33 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* test/gdbm/test_gdbm.rb (TestGDBM2#test_writer_open_notexist):
-	  gdbm 1.8.x changed GDBM::WRITER behavior. Thus our testcase need
-	  to be changed too.
-
-Fri Jan 28 17:33:28 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* test/gdbm/test_gdbm.rb (TestGDBM#test_s_open_no_create): skip
-	  the test if gdbm version is 1.8.x.
-
-Fri Jan 28 16:30:51 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* test/ruby/test_require.rb (TestRequire#test_require_too_long_filename):
-	  Added -w option because too long path error don't output a message
-	  by default since r30660. [Bug #4336] [ruby-dev:43134]
-
-Fri Jan 28 16:19:38 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* test/ruby/test_require.rb (TestRequire#test_require_path_home_{1,2}):
-	  Added -w option because too long path error don't output a message
-	  by default since r30660. [Bug #4336] [ruby-dev:43134]
-
-Fri Jan 28 16:04:54 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* test/ruby/test_require.rb (TestRequire#test_require_path_home_{1,2,3}):
-	  split from test_require_path_home.
-
-Fri Jan 28 13:04:38 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* configure.in (--with-valgrind): Fixed r29683. Now this option
-	  is really default on.
-
-Fri Jan 28 12:05:48 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* configure.in: Add #include<sys/stat.h> when struct stat is
-	  tested. Otherwise, incomplete type dereference error will occur.
-
-Fri Jan 28 11:53:19 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* configure.in: redundant variable names made strange conftest
-	  error. Fixed it.
-
-Fri Jan 28 11:47:00 2011  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* test/ruby/test_process.rb (TestProcess#test_too_long_path{,2}):
-	  should handle Errno::E2BIG, because this test checks crash of ruby,
-	  not the error type system.
-
-Fri Jan 28 11:23:54 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* io.c (rb_io_open): Use NUM2MODET() instead NUM2UINT().
-	* io.c (rb_scan_open_args): ditto.
-
-Fri Jan 28 10:58:20 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* configure.in: Added mode_t type checking.
-	* process.c (rb_exec_arg_addopt): Use NUM2MODET() instead
-	  NUM2LONG because clang makes compile error by this narrowing
-	  conversion.
-	* process.c (rb_run_exec_options_err): ditto.
-
-Fri Jan 28 02:37:18 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* re.c (rb_reg_raise): add GC guard to prevent intermediate
-	  variable from GC.
-
-Fri Jan 28 02:35:41 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* hash.c (rb_hash_fetch_m): add GC guard to prevent intermediate
-	  variable from GC.
-
-Fri Jan 28 01:33:51 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* test/ruby/test_process.rb (TestProcess#test_too_long_path)
-	  TestProcess#test_too_long_path): Reduced string size from 100MB
-	  to 10MB. 100MB may cause no memory error. It isn't intended.
-
-Fri Jan 28 01:27:42 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* test/ruby/test_process.rb (TestProcess#test_too_long_path2):
-	  Factored out from test_too_long_path. A test should only do
-	  one test.
-
-Thu Jan 27 23:29:36 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* st.c (st_foreach): check if unpacked.
-
-Thu Jan 27 23:14:19 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* misc/ruby-mode.el (ruby-mode-map): remove deprecated binding.
-	  use M-; instead.
-
-Thu Jan 27 21:58:32 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* bignum.c (rb_str_to_inum): get rid of too huge alloca().
-
-Thu Jan 27 21:43:29 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* object.c (rb_str_to_dbl): rewrite again. use ALLOCV instead
-	  rb_str_tmp_new().
-
-Thu Jan 27 21:41:47 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* win32/win32.c: get rid of STRNDUPA(). It's dangerous API.
-
-Thu Jan 27 21:31:57 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* win32/win32.c (rb_w32_aspawn): get rid of too huge alloca().
-	  [Bug #4330] [ruby-core:34898]
-
-Thu Jan 27 20:30:18 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* win32/win32.c (rb_w32_spawn): get rid of too huge alloca().
-
-Thu Jan 27 18:49:53 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* win32/win32.c (open_dir_handle): get rid of too huge alloca().
-
-Thu Jan 27 18:34:58 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* file.c (w32_io_info): get rid of too huge alloca().
-	  [Bug #4313] [ruby-core:34830]
-
-Thu Jan 27 18:19:51 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* win32/win32.c (wstati64): get rid of too huge alloca().
-	  [Bug #4316] [ruby-core:34834]
-
-Thu Jan 27 15:11:52 2011  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* win32/win32.c (rb_w32_spawn, rb_w32_aspawn): get rid of too huge
-	  alloca(). this is the real fix of [ruby-core:34833].
-
-Thu Jan 27 12:46:25 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* process.c (ALLOC_ARGV_WITH_STR): fix void pointer arithmetic.
-
-Thu Jan 27 08:41:40 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* process.c (proc_exec_v, rb_proc_exec_n, rb_proc_exec)
-	  (proc_spawn_n, proc_spawn): get rid of too huge alloca().
-	  [ruby-core:34827], [ruby-core:34833]
-
-Thu Jan 27 08:32:17 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* include/ruby/ruby.h (ALLOCV): new API for exception-safe
-	  temporary buffer.  [ruby-core:34844]
-
-	* string.c (rb_alloc_tmp_buffer, rb_free_tmp_buffer):
-	  implementation of the API.
-
-Thu Jan 27 08:22:49 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* dln_find.c (dln_find_1): use rb_warning and return immediately
-	  if fname is longer than buffer.
-
-Wed Jan 26 22:57:30 2011  CHIKANAGA Tomoyuki  <nagachika00@gmail.com>
-
-	* class.c (clone_method): add GC guard to prevent intermediate
-	  variable from GC. [Bug #4321] [ruby-dev:43107]
-
-Wed Jan 26 22:45:16 2011  Tanaka Akira  <akr@fsij.org>
-
-	* template/id.h.tmpl: parenthesize macro arguments.
-
-Wed Jan 26 22:28:49 2011  CHIKANAGA Tomoyuki  <nagachika00@gmail.com>
-
-	* vm_eval.c (rb_throw_obj): add GC guard to prevent intermediate
-	  variable from GC. [Bug #4322] [ruby-dev:43108]
-
-Wed Jan 26 17:08:59 2011  NAKAMURA, Hiroshi  <nahi@ruby-lang.org>
-
-	* ext/openssl/ossl_asn1.c (ossl_asn1_decode0): OpenSSL::ASN1.decode
-	  should reject indefinite length primitive encodings as that is
-	  illegal. Patch by Martin Bosslet. See #4324.
-
-Wed Jan 26 10:36:28 2011  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* string.c (=~): documentation fix; the return value is nil when
-	  it doesn't match. patched by Andrei Kulakov [ruby-core:34562]
-
-Tue Jan 25 08:41:58 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* dln_find.c (dln_find_1): omit too long pathnames.
-
-Tue Jan 25 08:28:19 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* string.c (rb_str_resize): get rid of out-of-bound access.
-
-Tue Jan 25 07:48:22 2011  Kazuhiro NISHIYAMA  <zn@mbf.nifty.com>
-
-	* test/ruby/test_thread.rb: remove unused variables.
-
-Tue Jan 25 07:45:44 2011  Kazuhiro NISHIYAMA  <zn@mbf.nifty.com>
-
-	* test/ruby/test_thread.rb (TestThread#test_condvar_nolock_2): get
-	  rid of method redefined.
-
-Tue Jan 25 07:00:52 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* string.c (rb_string_value_cstr): rb_str_modify can change
-	  RSTRING_PTR.
-
-Tue Jan 25 03:24:28 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* test/ruby/test_thread.rb: Added various ConditionVariable tests.
-
-Mon Jan 24 22:26:33 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* object.c (rb_str_to_dbl): Fix again. use rb_str_tmp_new()
-	  instead ALLOC_N.
-
-Mon Jan 24 21:50:48 2011  Tanaka Akira  <akr@fsij.org>
-
-	* vm_insnhelper.h: parenthesize macro arguments.
-
-Mon Jan 24 21:28:34 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* object.c (rb_str_to_dbl): use ALLOC_N instead ALLOCA_N because
-	  ALLOC_N may cause stack overflow.
-
-Mon Jan 24 21:04:45 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* error.c (rb_invalid_str): prevent intermediate variable from GC.
-	  [ruby-core:34820]
-
-Sun Jan 23 23:01:54 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* test/io/console/test_io_console.rb: Don't run test if the system
-	  don't support io/console.
-
-Sun Jan 23 22:17:07 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* test/fiddle/test_fiddle.rb: Don't run test if the system don't support
-	  fiddle.
-
-	* test/fiddle/test_function.rb: ditto.
-	* test/fiddle/test_closure.rb: ditto.
-
-Sun Jan 23 11:39:18 2011  Tanaka Akira  <akr@fsij.org>
-
-	* vm_exec.h: parenthesize macro arguments.
-
-Sun Jan 23 10:33:02 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* template/fake.rb.in (ruby): suppress warnings.
-
-Sun Jan 23 08:00:09 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* string.c (str_nth_len, str_utf8_nth): return the rest length together.
-
-	* string.c (rb_str_substr): get rid of measure the length always
-	  to improve performance for huge string.  [ruby-core:34648]
-
-Sun Jan 23 00:40:10 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* test/test_syslog.rb: Fix to make a lot of test failure if
-	  the platform doesn't support syslog.
-
-Sat Jan 22 11:49:55 2011  Aaron Patterson <aaron@tenderlovemaking.com>
-
-	* ext/psych/lib/psych/visitors/to_ruby.rb: fixing merge key support
-	  when multiple merge keys are specified.
-
-	* test/psych/test_merge_keys.rb: tests for multi-merge key support
-
-Sat Jan 22 11:33:04 2011  Aaron Patterson <aaron@tenderlovemaking.com>
-
-	* ext/psych/lib/psych/visitors/to_ruby.rb: merge keys are actually
-	  part of YAML 1.1, so they should be supported.  Remove warning and
-	  merge keys to parent.  [ruby-core:34679]
-
-	* test/psych/test_merge_keys.rb: test for merge keys
-
-Sat Jan 22 10:25:19 2011  Aaron Patterson <aaron@tenderlovemaking.com>
-
-	* ext/psych/parser.c (parse): add the file name to the exception when
-	  parse errors occur.
-
-	* test/psych/test_parser.rb: test for parse error file name
-
-Sat Jan 22 10:12:30 2011  Aaron Patterson <aaron@tenderlovemaking.com>
-
-	* ext/psych/parser.c (parse): fix assertion error when reusing a
-	  parser after an exception has been raised
-
-	* test/psych/test_parser.rb: test for assertion error
-
-Sat Jan 22 04:09:22 2011  Aaron Patterson <aaron@tenderlovemaking.com>
-
-	* ext/psych/lib/psych/nodes/node.rb: Make Psych::Nodes::Node
-	  enumerable.
-
-	* ext/psych/lib/psych/visitors/depth_first.rb: Add a depth-first
-	  visitor to enumerate over a YAML AST in a depth-first fashion
-
-	* test/psych/nodes/test_enumerable.rb: test for enumerating nodes
-
-	* test/psych/visitors/test_depth_first.rb: test for depth-first
-	  visitor
-
-Sat Jan 22 00:53:42 2011  Tanaka Akira  <akr@fsij.org>
-
-	* vm_core.h: parenthesize macro arguments.
-
-Fri Jan 21 18:15:09 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* configure.in: should not use -Werror=* flags while conftests.
-
-Fri Jan 21 09:17:00 2011  Luis Lavena  <luislavena@gmail.com>
-
-	* configure.in: Fix incorrectly detected x86_64-w64-mingw32 due
-	  canonalization of target_os. Bug #3889 [ruby-core:32634]
-
-Thu Jan 20 23:44:00 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* configure.in: Fix rb_cv_va_args_macro was broken. We are using
-	  -Werror=implicit-function-declaration compile option. therefore
-	  we need a function declaration explicitly.
-
-Thu Jan 20 23:58:02 2011  Tanaka Akira  <akr@fsij.org>
-
-	* node.h: parenthesize macro arguments.
-
-Thu Jan 20 23:25:28 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* configure.in: Add '#include <stdlib.h>' to
-	  rb_cv_localtime_overflow test too. It's reported by Tomoyuki
-	  Chikanaga. Thanks.
-
-Thu Jan 20 16:11:00 2011  Kenta Murata <mrkn@mrkn.jp>
-
-	* README.EXT, README.EXT.ja: You shouldn't choose ``conftest.c'' as a
-	  name of a source file.
-
-Thu Jan 20 12:15:44 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* configure.in: Add stdlib.h inclusion into rb_cv_negative_time_t
-	  test because it's required for exit(3). The patch is
-	  created by Tomoyuki Chikanaga. [Bug #4287] [ruby-dev:43060]
-
-Thu Jan 20 11:39:41 2011  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* test/webrick/utils.rb (TestWEBrick::RubyBin): test CGI does not need
-	  to load rubygems.  if it activated, ruby raises LoadError about
-	  rbconfig.rb.
-
-Thu Jan 20 09:19:42 2011  Aaron Patterson <aaron@tenderlovemaking.com>
-
-	* ext/psych/lib/psych/visitors/json_tree.rb: Fix JSON emit for
-	  DateTime and Time classes.
-
-	* test/psych/test_json_tree.rb: test for JSON emit
-
-Thu Jan 20 08:02:46 2011  Aaron Patterson <aaron@tenderlovemaking.com>
-
-	* ext/psych/lib/psych/coder.rb (represent_object): arbitrary objects
-	  may be passed to the Psych::Coder object.
-
-	* ext/psych/lib/psych/visitors/yaml_tree.rb: support for visiting
-	  arbitrary objects set on the coder.
-
-	* test/psych/test_coder.rb: supporting test case.
-
-Thu Jan 20 06:03:17 2011  Tanaka Akira  <akr@fsij.org>
-
-	* method.h: parenthesize macro arguments.
-
-Wed Jan 19 13:16:05 2011  Eric Hodel  <drbrain@segment7.net>
-
-	* lib/rubygems/commands/sources_command.rb: Finish removing code,
-	  (fixes sources command test).
-
-Wed Jan 19 13:04:16 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* proc.c (proc_call): Add gc guard to avoid segfault. The fix
-	  is created by Tomoyuki Chikanaga. [Bug #4238][ruby-dev:42963]
-
-Wed Jan 19 12:31:28 2011  Eric Hodel <drbrain@segment7.net>
-
-	* lib/rubygems.rb: Since gem_prelude requires rubygems, enable
-	  custom_require always.
-
-Wed Jan 19 12:08:08 2011  Eric Hodel <drbrain@segment7.net>
-
-	* lib/rubygems/commands/dependency_command.rb: Remove require of
-	  deleted file.
-	* lib/rubygems/commands/fetch_command.rb: ditto
-	* lib/rubygems/commands/setup_command.rb: ditto
-	* lib/rubygems/commands/sources_command.rb: ditto
-	* lib/rubygems/commands/specification_command.rb: ditto
-
-Wed Jan 19 08:13:59 2011  Ryan Davis  <ryand-ruby@zenspider.com>
-
-	* lib/rubygems*: Import rubygems 1.5.0 (release candidate)
-	* test/rubygems: Ditto
-
-Tue Jan 18 23:31:01 2011  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* parse.y: avoid NULL reference.  [ruby-dev:43067]
-
-Wed Jan 19 02:54:04 2011  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* vsnprintf.c (cvt): set first byte of buf to NUL for the case when
-	  no bytes are written to the buf. [ruby-dev:43062]
-
-Tue Jan 18 23:04:51 2011  Tanaka Akira  <akr@fsij.org>
-
-	* gc.h: parenthesize macro arguments.
-
-Tue Jan 18 18:31:14 2011  Keiju Ishitsuka  <keiju@ishitsuka.com>
-
-	* lib/irb/completion.rb: Irb tab completion support for XX::method
-	  forms.
-
-Tue Jan 18 15:05:55 2011  NAKAMURA, Hiroshi  <nahi@ruby-lang.org>
-
-	* lib/logger.rb: added RDoc document for logging message escape
-	  by Hal Brodigan. See #3869
-
-Tue Jan 18 07:53:52 2011  Tanaka Akira  <akr@fsij.org>
-
-	* eval_intern.h: parenthesize macro arguments.
-
-Tue Jan 18 04:42:44 2011  Aaron Patterson <aaron@tenderlovemaking.com>
-
-	* ext/psych/lib/psych/parser.rb (Mark): Adding a class to wrap
-	  marker information
-
-	* ext/psych/parser.c (mark): Add a method to return the mark object
-	  for the parser
-
-	* test/psych/test_parser.rb: tests for the Mark class.
-
-Tue Jan 18 02:46:55 2011  Aaron Patterson <aaron@tenderlovemaking.com>
-
-	* ext/psych/lib/psych/visitors/json_tree.rb (visit_String): JSON
-	  strings should be dumped with double quotes. [ruby-core:34186]
-
-	* test/psych/test_json_tree.rb: test for double quotes
-
-Mon Jan 17 23:36:33 2011  Tanaka Akira  <akr@fsij.org>
-
-	* array.c (rb_ary_times): less MEMCPY calls.
-
-Mon Jan 17 22:54:33 2011  Tanaka Akira  <akr@fsij.org>
-
-	* debug.h: parenthesize macro arguments.
-
-Mon Jan 17 21:40:25 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* ruby.c (process_options): revert r30549.
-
-Sun Jan 16 20:55:45 2011  Tanaka Akira  <akr@fsij.org>
-
-	* vsnprintf.c: parenthesize macro arguments.
-
-Sat Jan 15 11:57:30 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* configure.in (warnflags): add -Werror=implicit-function-declaration
-	  if available.
-
-	* lib/mkmf.rb (init_mkmf): ignore warnings in mkmf tests.
-
-	* test/mkmf/base.rb (setup, teardown): restore config values.
-
-	* test/mkmf/test_flags.rb: split from test_find_executable.rb.
-
-Sat Jan 15 10:04:14 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* ruby.c (process_options): autoload rubygems.
-
-	* tool/compile_prelude.rb (Prelude#initialize): ignore empty
-	  preludes.
-
-	* ruby.c (ruby_init_prelude): get rid of global namespace
-	  pollution.
-
-Sat Jan 15 09:42:12 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* include/ruby/io.h: missing prototypes.
-
-Fri Jan 14 23:25:55 2011  Tanaka Akira  <akr@fsij.org>
-
-	* vm_method.c: parenthesize macro arguments.
-
-Fri Jan 14 15:32:29 2011  Shugo Maeda  <shugo@ruby-lang.org>
-
-	* test/net/imap/test_imap.rb: call neither logout nor disconnect
-	  unless connected.  patch by Kazuhiro NISHIYAMA.  [ruby-dev:42860]
-
-Fri Jan 14 14:56:57 2011  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* lib/net/imap.rb: use bytesize for binary strings.
-	  patched by Yoshimasa Niwa. [ruby-core:34222]
-
-Fri Jan 14 14:01:12 2011  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* pack.c (pack_unpack): the resulted string of unpack('M') must have
-	  ASCII-8BIT encoding (and ENC_CODERANGE_VALID). [ruby-core:34482]
-
-Fri Jan 14 13:38:58 2011  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* ext/zlib/zlib.c (gzfile_check_footer): ISIZE (Input SIZE) in
-	  gzip's header is the size of uncompressed input data modulo 2^32.
-	  [ruby-core:34481] http://www.ietf.org/rfc/rfc1952.txt
-
-Fri Jan 14 11:36:25 2011  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* configure.in, win32/Makefile.sub (RUNRUBY): require path should
-	  include "." because rbconfig.rb is there.
-
-Fri Jan 14 10:40:11 2011  Ryan Davis  <ryan@lust.local>
-
-	* gem_prelude.rb: Just require rubygems. Fixes rubygems 1.4.
-	* lib/rubygems.rb: removed all Gem::Quickloader code.
-	* ruby.c: renamed ruby_init_gems to ruby_init_prelude. Set
-	  $disable_rubygems since there is no fine grained mechanism to
-	  skip parts of the prelude. Open to suggestions on how to do this
-	  better.
-	* test/*.rb: Load path isn't set up correctly, so add
-	  --disable-gems as needed to failing tests that are explicitly
-	  testing stderr w/ ==.
-
-Fri Jan 14 07:30:47 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* io.c (argf_next_argv): go advance when the next file cannot be
-	  read.  [ruby-core:34446]
-
-Thu Jan 13 20:49:19 2011  Tanaka Akira  <akr@fsij.org>
-
-	* vm_insnhelper.c: parenthesize macro arguments.
-
-Thu Jan 13 13:21:00 2011  Kenta Murata  <mrkn@mrkn.jp>
-
-	* vm_dump.c: delete dashes to make lines 80 chars, Patched by
-	  Shota Fukumori (sora_h).  [Bug #4275] [ruby-dev:43021]
-
-Thu Jan 13 13:21:00 2011  Kenta Murata  <mrkn@mrkn.jp>
-
-	* vm_dump.c: fix misspelling of CrashReporter, Patched by Shota
-	  Fukumori (sora_h).  [Bug #4275] [ruby-dev:43021]
-
-Thu Jan 13 06:27:29 2011  Ryan Davis  <ryand-ruby@zenspider.com>
-
-	* error.c: Exception#to_s should actually call to_s.
-
-Thu Jan 13 00:32:54 2011  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* addr2line.c (get_nth_dirname): decrement the directory index
-	  because the index specifies the index of given included_directories
-	  which is separated by NUL and its index is begun from 1.
-	  Note that 0 specifies the current directory of the compilation.
-	  see also http://www.dwarfstd.org/doc/dwarf-2.0.0.pdf
-
-Thu Jan 13 00:06:38 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* io.c (rb_f_syscall): Add warning messages. [ruby-core:34062]
-
-Thu Jan 13 00:00:07 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* io.c (rb_f_syscall): Some syscall return unsigned or pointer value.
-	  Therefore we should only check the result is -1 or not.
-	  [ruby-core:34062]
-
-Wed Jan 12 23:55:48 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* io.c (rb_f_syscall): Add 64bit Linux support. Some syscall takes
-	  long type arguments.
-
-Wed Jan 12 19:37:10 2011  Tanaka Akira  <akr@fsij.org>
-
-	* vm_dump.c: parenthesize macro arguments.
-
-Wed Jan 12 19:28:23 2011  Tanaka Akira  <akr@fsij.org>
-
-	* vm.c (thread_free): reset ruby_current_thread if it points the
-	  thread to free.
-	* gc.c (slot_sweep): don't call RUBY_VM_SET_FINALIZER_INTERRUPT if
-	  there is no current thread.
-	  [ruby-dev:43000]
-
-Wed Jan 12 19:09:29 2011  Tanaka Akira  <akr@fsij.org>
-
-	* enum.c (sort_by_i): reenter check more strictly.
-	  (sort_by_cmp): ditto.
-	  [ruby-dev:43003] reported by Usaku NAKAMURA.
-
-Wed Jan 12 16:25:12 2011  Yuki Sonoda (Yugui)  <yugui@yugui.jp>
-
-	* lib/net/http.rb (Net::HTTP#connect): makes it timeout during
-	  SSL handshake too. [ruby-core:34203]
-	  Patch by Marc Slemko.
-
-	* test/net/http/test_http.rb (TestNetHTTP_v1_2#test_timeout_during_HTTP_session):
-	  test for [ruby-core:34203]
-
-	* test/net/http/test_https.rb (TestNetHTTPS#test_timeout_during_SSL_handshake):
-	  ditto.
-
-Wed Jan 12 16:24:53 2011  Yuki Sonoda (Yugui)  <yugui@yugui.jp>
-
-	* ext/readline/extconf.rb: new checks for RL_PROMPT_START_IGNORE
-	  and RL_PROMPT_END_IGNORE. [ruby-core:34331]
-
-	* ext/readline/readline.c: enables USE_INSERT_IGNORE_ESCAPE only if
-	  RL_PROMPT_{START,END}_IGNORE are available to get rid of compilation
-	  error with libedit.
-
-Wed Jan 12 15:53:49 2011  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* README.EXT.ja (rb_ensure): typo.
-
-Wed Jan 12 11:33:46 2011  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* addr2line.c: OpenBSD uses the elf_abi.h header file instead of the
-	  elf.h header file. patched by Jeremy Evans [ruby-core:34384]
-
-Wed Jan 12 03:59:36 2011  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* test/webrick/test_cgi.rb: Removes usage of deprecated
-	  :RequestHandler option.
-	  patched by Peter Weldon [ruby-core:34010]
-
-	* test/webrick/test_httpproxy.rb: ditto.
-
-	* test/webrick/test_httpserver.rb: Add a test of the deprecation
-	  behaviour.
-
-Wed Jan 12 08:37:07 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* hash.c (hash_i): return different values for inverse hash.
-	  [ruby-core:34334]
-
-Tue Jan 11 20:32:59 2011  Tanaka Akira  <akr@fsij.org>
-
-	* variable.c: parenthesize macro arguments.
-
-Tue Jan 11 13:06:38 2011  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* array.c (rb_ary_resize): should care of embedded array when extending
-	  the array.
-
-	* array.c (rb_ary_resize): need to set capa when changing the real
-	  size of the array.
-	  these are latent bugs.
-
-Mon Jan 10 22:46:43 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* include/ruby/defines.h (CASEFOLD_FILESYSTEM): HFS+ is case
-	  insensitive.
-
-	* load.c (loaded_feature_path, rb_feature_p, load_lock): on a
-	  case-insensitive filesystem, loaded features search should
-	  ignore case.  [ruby-core:34297]
-
-Mon Jan 10 21:34:12 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* common.mk (showflags): show LD commands.
-
-Mon Jan 10 14:32:55 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* test/ruby/test_method.rb (TestMethod#test_define_method): method
-	  transplanting between class and module is impossible.
-
-Mon Jan 10 13:51:17 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* misc/rdoc-mode.el (rdoc-mode): show trailing whitespace.
-
-Mon Jan 10 11:22:02 2011  Tanaka Akira  <akr@fsij.org>
-
-	* util.c: parenthesize macro arguments.
-
-Mon Jan 10 07:41:31 2011  Kazuhiro NISHIYAMA  <zn@mbf.nifty.com>
-
-	* misc/README: mention rdoc-mode.el and ruby-style.el.
-
-Sun Jan  9 20:37:21 2011  Tanaka Akira  <akr@fsij.org>
-
-	* transcode.c: parenthesize macro arguments.
-
-Sun Jan  9 16:31:53 2011  Yuki Sonoda (Yugui)  <yugui@yugui.jp>
-
-	* io.c (Kernel.#syscall): implemented on LP64/LLP64 environments too.
-	  also uses __syscall if available for *BSD on 64bit architecture.
-	  [ruby-core:34062]
-
-Sun Jan  9 16:31:34 2011  Yuki Sonoda (Yugui)  <yugui@yugui.jp>
-
-	* lib/irb/locale.rb (IRB::Locale::LOCALE_NAME_RE):
-	  some platform has a locale without territory but with
-	  encoding.
-	  (#each_sub_locale): ditto.
-
-Sun Jan  9 14:47:50 2011  TAKAO Kouji  <kouji@takao7.net>
-
-	* ext/readline/readline.c: apply a patch from Nobuyoshi Nakada.
-	  fixed #3616 [ruby-core:31484] IRB + readline incorrectly counts
-	  non-printing characters in prompt
-
-Sat Jan  8 21:47:26 2011  Tanaka Akira  <akr@fsij.org>
-
-	* enum.c (enum_sort_by): use rb_ary_resize.
-	  (ary_cutoff): removed.
-
-Sat Jan  8 21:24:17 2011  Tanaka Akira  <akr@fsij.org>
-
-	* pack.c (swapf): compilation condition simplified.
-	  (swapd): ditto.
-
-Sat Jan  8 20:51:25 2011  Tanaka Akira  <akr@fsij.org>
-
-	* pack.c (swapd): remove duplicated code.
-
-Sat Jan  8 19:28:55 2011  Tanaka Akira  <akr@fsij.org>
-
-	* thread.c: parenthesize macro arguments.
-
-Fri Jan  7 23:07:40 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* lib/mkmf.rb (configuration): backref needs to capture.
-
-Fri Jan  7 21:57:22 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* misc/ruby-mode.el (ruby-mode-variables), misc/ruby-style.el:
-	  show trailing whitespace.
-
-	* misc/ruby-mode.el (ruby-font-lock-syntactic-keywords): highlight
-	  regexp after open bracket.  [ruby-core:34183]
-
-Fri Jan  7 00:37:35 2011  Tanaka Akira  <akr@fsij.org>
-
-	* string.c: parenthesize macro arguments.
-
-Thu Jan  6 22:42:02 2011  Yukihiro Matsumoto  <matz@ruby-lang.org>
-
-	* bignum.c (bigmul1_karatsuba): avoid overflow that make assertion
-	  fail in certain case.  this patch is contributed from Ray Chason
-	  <chasonr at gmail.com> in personal communication.
-
-Thu Jan  6 20:55:49 2011  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* lib/mkmf.rb (create_makefile): ignore rest from first dot from
-	  TARGET to generate init function name.
-	  this is followup of r30464.
-
-Thu Jan  6 11:27:01 2011  Aaron Patterson <aaron@tenderlovemaking.com>
-
-	* ext/psych/lib/psych/json/tree_builder.rb (start_mapping): tags
-	  should not be included in JSON mapping
-
-Thu Jan  6 09:23:33 2011  Aaron Patterson <aaron@tenderlovemaking.com>
-
-	* lib/net/protocol.rb (eof?): BufferedIO should proxy eof? to the
-	  underlying IO object.
-
-Thu Jan  6 09:12:31 2011  Aaron Patterson <aaron@tenderlovemaking.com>
-
-	* lib/mkmf.rb (configuration): fixing gsub when multiple error flags
-	  are passed to GCC.
-
-Thu Jan  6 05:25:49 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* array.c (rb_ary_modify): export.
-
-Thu Jan  6 05:14:41 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* ext/stringio/stringio.c (get_strio, strio_set_string)
-	  (strio_reopen): check if frozen.  [ruby-core:33648]
-
-Thu Jan  6 05:10:58 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* array.c (rb_ary_resize): new utility function.  [ruby-dev:42912]
-
-Thu Jan  6 05:03:26 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* dln.c (init_funcname_len): ignore rest from first dot.
-	  [ruby-dev:41774]
-
-Thu Jan  6 02:55:48 2011  Aaron Patterson <aaron@tenderlovemaking.com>
-
-	* ext/psych/lib/psych/visitors/yaml_tree.rb: use YAML 1.0 output
-	  format for serializing nil values.  Thanks Eric Hodel!
-
-	* test/psych/test_nil.rb: test for nil values
-
-Wed Jan  5 14:21:34 2011  Mark Dodwell  <hi@mkdynamic.co.uk>
-
-	* string.c: fix rdoc typo.
-	  https://github.com/shyouhei/ruby/pull/3
-
-Wed Jan  5 14:06:01 2011  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* test/rdoc/test_rdoc_options.rb (TestRDocOptions#test_check_files):
-	  skip on Windows because chmod 0 doesn't mean unreadable by owner.
-
-Wed Jan  5 13:56:54 2011  Akinori MUSHA  <knu@iDaemons.org>
-
-	* lib/net/http.rb (Net::HTTP#get): A header hash given should not
-	  be modified.
-
-Wed Jan  5 12:10:08 2011  Aaron Patterson <aaron@tenderlovemaking.com>
-
-	* ext/dl/{cfunc.c,dl.h,handle.c}, ext/fiddle/fiddle.{h,c}: Use _WIN32
-	  rather than checking for windows.h.  Thanks Jon Forums!
-	  [ruby-core:33977]
-
-Sat Jan  1 17:02:50 2011  Yuki Sonoda (Yugui)  <yugui@yugui.jp>
-
-	* lib/irb/locale.rb (IRB::Locale#search_file): make it possible
-	  to load a localization from a gem.
-	  (IRB::Locale#lc_path): obsoleted because of the change of #search_file
-	  (IRB::Locale#each_localized_path): new private method, based on
-	  lc_path
-	  (IRB::Locale#find): follows the change of #search_file.
-	  (IRB::Locale#load): removed duplicate with #find.
-
-Sat Jan  1 11:44:42 2011  Tanaka Akira  <akr@fsij.org>
-
-	* strftime.c: parenthesize macro arguments.
-
-Sat Jan  1 11:10:29 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* ext/zlib/zlib.c: take care of platforms where long is bigger
-	  than int.
-
-Sat Jan  1 11:03:58 2011  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* NEWS (optparse): shell completion support.
-
-	* misc/README (rb_optparse.{bash,zsh}): for shell completion.
-
-	* include/ruby/intern.h (VALUE rb_ary_print_on): I have never seen
-	  this function anywhere.
-
-Sat Jan  1 04:20:11 2011  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* win32/win32.c (rb_w32_write_console): don't raise exception when
-	  the conversion is for writing to console.
-	  Patched by Heesob Park [ruby-core:33999]
-
-Fri Dec 31 12:02:06 2010  Tanaka Akira  <akr@fsij.org>
-
-	* enum.c (enum_sort_by): use less temporary objects.
-
-Fri Dec 31 11:46:47 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* configure.in (warnflags), lib/mkmf.rb (configuration): turn
-	  warnings into errors only for bundled extensions.
-	  [ruby-core:33815]
-
-Fri Dec 31 11:15:57 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* ext/zlib/zlib.c (sizeof): zlib.h mistakenly assumes the result
-	  of sizeof to be int, not size_t.
-
-Fri Dec 31 10:27:34 2010  Tanaka Akira  <akr@fsij.org>
-
-	* st.c: parenthesize macro arguments.
-
-Fri Dec 31 03:23:26 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* vsnprintf.c (BSD__uqtoa): Fix overflow when long != quad_t.
-	  patched by Peter Weldon <peter.weldon AT null.net>
-	  [ruby-core:33985]
-
-Fri Dec 31 03:00:34 2010  Kazuhiro NISHIYAMA  <zn@mbf.nifty.com>
-
-	* Makefile.in: remove unnecessary semicolons.
-
-Thu Dec 30 23:09:47 2010  wanabe  <s.wanabe@gmail.com>
-
-	* vm.c (vm_define_method): guard iseq from GC while method definition.
-	  [ruby-dev:42832]
-
-Thu Dec 30 20:18:32 2010  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* win32/Makefile.sub: ditto.
-
-Thu Dec 30 20:57:09 2010  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* Makefile.in: Check V=1 argument if run "make clean" or similar.
-
-Thu Dec 30 20:41:50 2010  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* Makefile.in: Kill ugly line continuation.
-
-Thu Dec 30 11:49:40 2010  Tanaka Akira  <akr@fsij.org>
-
-	* sprintf.c: parenthesize macro arguments.
-
-Wed Dec 29 21:20:13 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* io.c (maygvl_copy_stream_wait_readwrite): define if USE_SENDFILE
-
-Wed Dec 29 20:37:43 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* ext/extmk.rb: strip current directory prefix.
-
-	* enc/depend (clean): remove name2ctype.h when out-of-place build.
-
-	* win32/Makefile.sub (clean-enc): pass V to inferior make.
-
-Wed Dec 29 18:23:46 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* re.c (rb_reg_expr_str): need to escape if the coderange is invalid.
-
-Wed Dec 29 10:06:51 2010  Tanaka Akira  <akr@fsij.org>
-
-	* signal.c: parenthesize macro arguments.
-
-Wed Dec 29 07:22:15 2010  Eric Hodel  <drbrain@segment7.net>
-
-	* lib/rake/rdoctask.rb: Deprecate in favor of rdoc/task.
-
-Wed Dec 29 07:07:06 2010  Eric Hodel  <drbrain@segment7.net>
-
-	* lib/rdoc: Import RDoc 3.1
-
-Tue Dec 28 18:36:38 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* error.c, include/ruby/intern.h (rb_compile_error_with_enc): new
-	  function to raise syntax error, with source encoding'ed message.
-
-	* parse.y (compile_error): use above function.
-	  [ruby-core:33951] (#4217)
-
-Tue Dec 28 07:37:38 2010  Tanaka Akira  <akr@fsij.org>
-
-	* ruby.c: parenthesize macro arguments.
-
-Tue Dec 28 07:17:11 2010  Kazuhiro NISHIYAMA  <zn@mbf.nifty.com>
-
-	* NEWS: add ARGF.write and so on.
-
-Tue Dec 28 07:12:38 2010  Kazuhiro NISHIYAMA  <zn@mbf.nifty.com>
-
-	* NEWS: add new magic-comment. (warn-indent) [ruby-core:25442]
-
-Tue Dec 28 04:32:37 2010  Aaron Patterson <aaron@tenderlovemaking.com>
-
-	* ext/fiddle/extconf.rb: check for windows.h while building fiddle.
-	  Thanks Jon Forums! [ruby-core:33923]
-
-Tue Dec 28 01:45:12 2010  Kazuhiro NISHIYAMA  <zn@mbf.nifty.com>
-
-	* NEWS: Add Zlib.deflate and Zlib.inflate.
-	  [ruby-dev:42833]
-
-Mon Dec 27 21:22:33 2010  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* win32/configure.bat: Remove obsoleted coding rule. Now, we
-	  don't support to build on Windows 95/98 and Me.
-
-Mon Dec 27 18:27:13 2010  Tanaka Akira  <akr@fsij.org>
-
-	* re.c: parenthesize macro arguments.
-
-Mon Dec 27 15:22:23 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* win32/README.win32: note to need NT based OS to build ruby.
-
-Mon Dec 27 12:14:46 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* common.mk (EXTMK_ARGS): specify to pass macro V, because nmake
-	  doesn't pass it via MAKEFLAGS.
-
-Mon Dec 27 10:33:43 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* ext/zlib/zlib.c (Init_zlib): Add Zlib.deflate and Zlib.inflate.
-	  [ruby-dev:42833]
-
-Mon Dec 27 07:38:07 2010  Kazuhiro NISHIYAMA  <zn@mbf.nifty.com>
-
-	* misc/rb_optparse.zsh: add compdef for generator.
-
-Mon Dec 27 07:32:07 2010  Kazuhiro NISHIYAMA  <zn@mbf.nifty.com>
-
-	* lib/optparse.rb (OptionParser#compsys): escape brackets too.
-	  [ruby-dev:42754]
-
-Mon Dec 27 01:30:08 2010  Tanaka Akira  <akr@fsij.org>
-
-	* ext/socket/mkconstants.rb: add IF_NAMESIZE.
-	  add a default for INET6_ADDRSTRLEN.
-
-Sun Dec 26 23:49:47 2010  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* win32/Makefile.sub: suppress a strange error message when RMALL
-	  found no such file.
-	* win32/rmall.bat: new.
-
-Sun Dec 26 21:23:23 2010    <kosaki.motohiro@gmail.com>
-
-	* win32/Makefile.sub: fix 'nmake clean-enc' breakage since r28322.
-
-Sun Dec 26 22:25:07 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* ext/ripper/depend (ripper.y): fix messages with nmake.
-	  [ruby-dev:42896]
-
-Sun Dec 26 22:24:14 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* file.c (file_expand_path): get rid of warnings caused by
-	  -Wdeclaration-after-statement on cygwin.
-
-Sun Dec 26 20:28:34 2010  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* process.c (before_exec): add small comment.
-
-Sun Dec 26 20:52:21 2010  Tanaka Akira  <akr@fsij.org>
-
-	* ext/socket/mkconstants.rb: define INET_ADDRSTRLEN as 16 if not
-	  available.  fix compilation error on mswin32-60.  reported by nobu.
-
-Sun Dec 26 19:37:37 2010  Tanaka Akira  <akr@fsij.org>
-
-	* ext/socket/option.c: define IFNAMSIZ if not available.
-	  fix compilation error on mingw32.  reported by nobu.
-
-Sun Dec 26 12:16:29 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* lib/rdoc/ri/paths.rb (RDoc::RI::Paths::HOMEDIR): no exception if
-	  HOME is not set.  [ruby-core:33867]
-
-Sun Dec 26 11:39:11 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* parse.y (stmt): missing ripper rule.  i.e., `a::B ||= c 1'.
-	  http://twitter.com/#!/wannabe53/status/18797576396472321
-	  http://twitter.com/#!/wannabe53/status/18798416150663168
-
-Sun Dec 26 11:15:50 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* test/with_different_ofs.rb (DifferentOFS): should not affect
-	  original classes.
-
-Sun Dec 26 09:35:07 2010  Tanaka Akira  <akr@fsij.org>
-
-	* rational.c: parenthesize macro arguments.
-
-Sun Dec 26 09:22:19 2010  Tanaka Akira  <akr@fsij.org>
-
-	* ext/socket/option.c (rb_if_indextoname): new function to abstract
-	  environments without if_indextoname.
-	  (inspect_ipv6_multicast_if): new function to inspect
-	  IPV6_MULTICAST_IF.
-	  Socket::Option.new(:INET6, :IPV6, :MULTICAST_IF,
-	  [2].pack("I!")).inspect is
-	  "#<Socket::Option: INET6 IPV6 MULTICAST_IF eth0>".
-
-Sun Dec 26 04:31:15 2010  Luis Lavena  <luislavena@gmail.com>
-
-	* ext/dl/win32/registry.rb: Corrected RegCreateKeyExA signature.
-	  Patch by Rafal Michalski [ruby-core:33874] [Ruby 1.9-Bug#4203]
-
-Sun Dec 26 02:31:58 2010  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* io.c (advice_arg_check): Change argument check.
-	  Now, an unsupported advice makes NotImplementedError.
-	  [ruby-dev:42887] [Ruby 1.9-Feature#4204]
-
-Sun Dec 26 03:00:53 2010  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* ext/socket/extconf.rb: Fix build error which was introduced r30372.
-
-Sun Dec 26 01:37:10 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* ext/socket/extconf.rb: check the existence of if_indextoname().
-
-	* ext/socket/option.c: yesterday's akr's commits destroyed the build of
-	  some unrelated platforms (such as Windows).
-
-Sat Dec 25 23:29:11 2010  Tanaka Akira  <akr@fsij.org>
-
-	* ext/socket/option.c (inspect_ipv4_add_drop_membership): new function
-	  to inspect struct ip_mreq and struct ip_mreqn for
-	  IP_ADD_MEMBERSHIP and IP_DROP_MEMBERSHIP.
-	  Socket::Option.new(:INET, :IP, :ADD_MEMBERSHIP,
-	  [239,255,99,81, 0,0,0,0].pack("CCCCCCCC")).inspect is now
-	  "#<Socket::Option: INET IP ADD_MEMBERSHIP 239.255.99.81 0.0.0.0>".
-	  (inspect_ipv4_multicast_if): new function to inspect struct in_addr
-	  and struct ip_mreqn for IP_MULTICAST_IF.
-	  Socket::Option.new(:INET, :IP, :MULTICAST_IF,
-	  [192,168,0,7].pack("CCCC")).inspect is now
-	  "#<Socket::Option: INET IP MULTICAST_IF 192.168.0.7>".
-
-	* ext/socket/extconf.rb: check struct ip_mreq and struct ip_mreqn.
-
-Sat Dec 25 22:49:10 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* test/csv: DifferentOFS needs to be include in each classes.
-
-	* test/digest/test_digest_extend.rb (TestDigestExtend#setup):
-	  should not depend on the result of previous tests
-
-	* test/with_different_ofs.rb (DifferentOFS::WithDifferentOFS): give
-	  name.
-
-	* test/with_different_ofs.rb (DifferentOFS): test suite for test
-	  suites affected by $,.
-
-	* test/digest/test_digest_extend.rb (TestDigestExtend): should not
-	  assume $, invariant.
-
-	* test/csv/test_data_converters.rb, test/csv/test_table.rb: don't
-	  call setup within tests.
-
-Sat Dec 25 20:01:40 2010  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* io.c (pipe_open): Added rb_thread_atfork(). We must reinitialize
-	  GVL at new process creation.
-
-Sat Dec 25 18:26:55 2010  Tanaka Akira  <akr@fsij.org>
-
-	* ext/socket/option.c (inspect_ipv6_mreq): new function to inspect
-	  struct ipv6_mreq for IPV6_JOIN_GROUP and IPV6_LEAVE_GROUP.
-	  Socket::Option.new(:INET6, :IPV6, :JOIN_GROUP,
-	  [0xff12,0,0,0,0,0,0,1, 2].pack("nnnnnnnnI!")).inspect is now
-	  "#<Socket::Option: INET6 IPV6 JOIN_GROUP ff12::1 eth0>".
-
-	* ext/socket/extconf.rb: check struct ipv6_mreq.
-
-Sat Dec 25 18:04:30 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* lib/csv.rb (CSV.foreach): 'rb' mode is defaulted in open.
-
-	* lib/csv.rb (CSV#init_separators): cannonicalize encoding options
-	  as Encoding objects.
-
-Sat Dec 25 18:30:34 2010  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* thread.c (rb_thread_atfork): Add small comment why we need
-	  reset random seed.
-
-Sat Dec 25 17:33:55 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* test/csv/base.rb (TestCSV.with_different_ofs): give name to
-	  anonymous classes.
-
-	* lib/csv.rb (CSV#init_separators): use IO#gets with length
-	  parameter to get rid of wrong conversion.
-
-	* lib/csv.rb (CSV::foreach, CSV#initialize): directly use encoding
-
-	* lib/csv.rb, test/csv: should not assume $, invariant.
-
-Sat Dec 25 16:08:06 2010  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* signal.c: change rb_atomic_t definition from uchar to uint.
-
-Sat Dec 25 15:04:05 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* test/csv/test_encodings.rb (TestEncodings#setup): fix evil test
-	  suite writing to the source directory.
-
-Sat Dec 25 15:08:08 2010  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* ext/pty/pty.c (chfunc): Added rb_thread_atfork_before_exec().
-	  We must reinitialize GVL at new process creation. Otherwise
-	  we may meet an insane deadlock. [Bug#4121][ruby-dev:42686]
-
-Sat Dec 25 14:27:09 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* io.c (rb_io_extract_encoding_option): accept Encoding object as
-	  encoding: optional argument.  [ruby-dev:42884]
-
-Sat Dec 25 13:37:55 2010  Ryan Davis  <ryand-ruby@zenspider.com>
-
-	* lib/minitest/*.rb: Imported minitest 2.0.2 r6093.
-
-Sat Dec 25 13:05:59 2010  Tanaka Akira  <akr@fsij.org>
-
-	* random.c: parenthesize macro arguments.
-
-Sat Dec 25 12:48:50 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* load.c (rb_f_require_relative): don't omit return type.
-
-Sat Dec 25 11:06:00 2010  Eric Hodel  <drbrain@segment7.net>
-
-	* load.c (rb_f_require_relative): Add documentation.
-
-Sat Dec 25 11:02:52 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* ext/zlib/zlib.c (gzreader_gets): support optional length
-	  parameter.
-
-	* ext/zlib/zlib.c (gzfile_read, gzfile_readpartial): length should
-	  be long.
-
-Sat Dec 25 10:51:03 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* ext/json/generator/generator.{c,h} (fbuffer_free_only_buffer):
-	  unused.
-
-	* ext/openssl/ossl_pkcs5.c (ossl_pkcs5_pbkdf2_hmac): add casts.
-
-Fri Dec 24 08:46:04 2010  Tanaka Akira  <akr@fsij.org>
-
-	* process.c: parenthesize macro arguments.
-
-Thu Dec 23 19:17:14 2010  Yuki Sonoda (Yugui)  <yugui@yugui.jp>
-
-	* test/net/imap/cacert.pem: updated because it has been expired.
-
-	* test/net/imap/server.crt: signed again because CA cert was expired.
-
-Thu Dec 23 11:16:52 2010  Tanaka Akira  <akr@fsij.org>
-
-	* parse.y: parenthesize macro arguments.
-
-Thu Dec 23 11:00:09 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* error.c (rb_check_type): check for type from extensions for ruby
-	  1.8.  see [ruby-core:33797].
-
-Thu Dec 23 08:12:59 2010  Aaron Patterson <aaron@tenderlovemaking.com>
-
-	* lib/net/smtp.rb: refactoring Net::SMTP#esmtp= to use an
-	  attr_accessor
-
-Thu Dec 23 06:35:41 2010  Aaron Patterson <aaron@tenderlovemaking.com>
-
-	* lib/net/smtp.rb: Net::SMTP should close the SSL connection if the
-	  connection verification fails.
-
-Thu Dec 23 01:47:58 2010  Kazuhiro NISHIYAMA  <zn@mbf.nifty.com>
-
-	* NEWS: remove #object_id. [ruby-dev:42840]
-
-Wed Dec 22 08:56:39 2010  Kazuhiro NISHIYAMA  <zn@mbf.nifty.com>
-
-	* NEWS: add Module#private_constant and Module#public_constant.
-	  [ruby-dev:39685][ruby-core:32698]
-
-Wed Dec 22 07:59:23 2010  Kazuhiro NISHIYAMA  <zn@mbf.nifty.com>
-
-	* NEWS: add IO#advise. [ruby-core:33110] [Ruby 1.9-Feature#4038]
-
-Tue Dec 21 23:45:31 2010  Yukihiro Matsumoto  <matz@ruby-lang.org>
-
-	* gc.c (Init_GC): move back object_id to Kernel. [ruby-dev:42840]
-
-Tue Dec 21 12:45:16 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* configure.in (target_archs): remove temporary objects.
-
-	* enc/Makefile.in, enc/depend (clean): remove work directories.
-
-Tue Dec 21 07:39:12 2010  Tanaka Akira  <akr@fsij.org>
-
-	* pack.c: parenthesize macro arguments.
-
-Tue Dec 21 06:25:43 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* test/rexml/test_contrib.rb (ContribTester#test_pos): should not
-	  use fixed path name for tests.  [ruby-dev:42827]
-
-	* test/rexml/test_sax.rb (SAX2Tester#test_socket): should not use
-	  fixed port for tests.  [ruby-dev:42828]
-
-Tue Dec 21 06:10:18 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* compile.c (setup_args), vm.c (invoke_block_from_c),
-	  vm_insnhelper.c (caller_setup_args): reverted r30241 and r30243
-	  except for the test.
-
-Tue Dec 21 01:41:42 2010  Masaya Tarui  <tarui@ruby-lnag.org>
-
-	* io.c : add an extra byte to buffer for the specification of read
-	  in Windows. see [ruby-core:33460] and r29980. and, we have to
-	  discuss how to do this one byte.
-
-Tue Dec 21 01:18:06 2010  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* error.c: Fix build error for win32. This regression was
-	  introduced by r30271.
-
-Tue Dec 21 00:59:40 2010  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* thread.c (thread_cleanup_func): Moved interrupted_lock
-	  destroying code from native_thread_destroy() to
-	  thread_cleanup_func() because it's platform independent logic.
-
-	* thread_win32.c (native_thread_destroy): ditto.
-	* thread_pthread.c (native_thread_destroy): ditto.
-
-Tue Dec 21 00:46:20 2010  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* thread.c (thread_cleanup_func): Don't touch native threading
-	  resource at fork. Sadly this is purely bandaid. We need to
-	  implement proper fix later. [Bug #4169] [ruby-core:33767]
-
-Tue Dec 21 00:22:44 2010  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* error.c (exit_success_p): Check status code more carefully.
-	  status code may have garbage in upper bit.
-
-Mon Dec 20 23:12:37 2010  Tanaka Akira  <akr@fsij.org>
-
-	* node.c: parenthesize macro arguments.
-
-Mon Dec 20 20:04:41 2010  Kazuhiro NISHIYAMA  <zn@mbf.nifty.com>
-
-	* NEWS: add #__id__ and #object_id. [ruby-dev:42778]
-
-Mon Dec 20 20:03:21 2010  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* thread_pthread.c (native_thread_destroy): Fixed gvl_cond leak.
-
-Mon Dec 20 13:49:05 2010  Eric Hodel  <drbrain@segment7.net>
-
-	* NEWS: Add item for RDoc 3.0.1
-
-	* lib/rdoc: Import RDoc 3.0.1, remove require for perl parser.
-
-Mon Dec 20 12:15:32 2010  Eric Hodel  <drbrain@segment7.net>
-
-	* lib/rdoc: Import RDoc 3.0.
-
-Mon Dec 20 01:55:03 2010  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* io.c (Init_IO): Added O_DIRECT. This feature was proposed by
-	  Run Paint Run Run.
-	  [Feature #4015] [ruby-core:33018]
-
-Sun Dec 19 19:15:23 2010  Tanaka Akira  <akr@fsij.org>
-
-	* marshal.c: parenthesize macro arguments.
-
-Sat Dec 18 21:52:37 2010  Kazuhiro NISHIYAMA  <zn@mbf.nifty.com>
-
-	* vsnprintf.c (BSD_vfprintf): suppress warning: "_WIN32" is not
-	  defined.
-
-Sat Dec 18 16:02:27 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* compile.c (setup_args), vm.c (invoke_block_from_c),
-	  vm_insnhelper.c (caller_setup_args): fix of r30241. lambda block
-	  should check argument number.
-
-Sat Dec 18 14:42:29 2010  Tanaka Akira  <akr@fsij.org>
-
-	* load.c: parenthesize macro arguments.
-
-Sat Dec 18 10:07:04 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* compile.c (setup_args, iseq_compile_each): optimize AMPER LAMBDA
-	  combination as block.
-
-Fri Dec 17 22:07:16 2010  Yukihiro Matsumoto  <matz@ruby-lang.org>
-
-	* gc.c (Init_GC): move #__id__ and #object_id to BasicObject.
-	  [ruby-dev:42778]
-
-Fri Dec 17 19:35:13 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* test/mkmf/base.rb (TestMkmf::FakeLog): capture output from mkmf.
-
-	* test/mkmf/test_find_executable.rb (test_find_executable):
-	  suppress meaningless differences for chkbuild.
-
-Fri Dec 17 13:26:54 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* win32/setup.mak (BASERUBY): quit with an error when BASERUBY was not
-	  able to set, just like configure.in does. [ruby-dev:42782]
-
-Fri Dec 17 07:04:09 2010  Tanaka Akira  <akr@fsij.org>
-
-	* iseq.c: parenthesize macro arguments.
-
-Fri Dec 17 04:18:37 2010  Eric Hodel  <drbrain@segment7.net>
-
-	* transcode.c (str_encode): Alter comment for better wording and ri
-	  output.
-
-Fri Dec 17 00:05:40 2010  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* io.c (rb_io_advise): New API. IO#advise() allows to tell the
-	  ruby runtime how it expects to use a file handle. This feature
-	  can be improved a performance some situations.
-	  Note: This feature is mainly developed by Run Paint Run Run.
-	  Thank you! [ruby-core:33110] [Ruby 1.9-Feature#4038]
-
-	* io.c (do_io_advise): Helper function.
-	* io.c (io_advise_sym_to_const): ditto.
-
-Thu Dec 16 23:29:20 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* tool/rbinstall.rb (bin-comm): use transformed name.
-	  [ruby-dev:42777]
-
-Thu Dec 16 21:52:07 2010  Tanaka Akira  <akr@fsij.org>
-
-	* io.c: parenthesize macro arguments.
-
-Thu Dec 16 21:46:39 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* tool/mkconfig.rb (RbConfig): honor ARCHFLAGS and RC_ARCHS to
-	  override embedded ARCH_FLAG value on universal-darwin.
-
-Thu Dec 16 19:50:12 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* win32/{configure.bat,setup.mak,Makefile.sub} (PROGRAM_PREFIX,
-	  PROGRAM_SUFFIX): unite the differences of the names of macros of
-	  prefix and suffix.
-	  reported by HANEDA Norikatsu. [ruby-dev:42775]
-
-Thu Dec 16 08:04:47 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* node.h (RNode): match the type of flags to RBasic, and renamed
-	  nd_file as nd_reserved.
-
-	* iseq.c (set_relation), vm_insnhelper.c (vm_cref_push): nd_file
-	  is always zero-cleared.
-
-Thu Dec 16 07:22:30 2010  Ryan Davis  <ryand-ruby@zenspider.com>
-
-	* lib/minitest/unit.rb: Imported minitest 2.0.1 r6079.
-
-Wed Dec 15 20:45:02 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* lib/test/unit.rb (process_args): need to setup @help to print options.
-
-Wed Dec 15 11:19:33 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* test/zlib/test_zlib.rb (test_to_io): forgotten to fix with r30201.
-
-Wed Dec 15 11:07:34 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* io.c (simple_sendfile): enable on Mac OS X.
-
-	* io.c (nogvl_copy_stream_sendfile): moved precheck of copy length.
-
-	* io.c (nogvl_copy_stream_sendfile): should wait for both of
-	  read/write fds.
-
-Wed Dec 15 07:11:55 2010  Tanaka Akira  <akr@fsij.org>
-
-	* hash.c: parenthesize macro arguments.
-
-Wed Dec 15 04:02:00 2010  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* ext/openssl/ossl_x509ext.c (ossl_x509extfactory_set_config):
-	  fix compile error when !HAVE_X509V3_SET_NCONF. Thanks
-	  Chikanaga-san. [ruby-dev:42761] [Ruby 1.9-Bug#4158]
-
-Wed Dec 15 03:41:31 2010  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* test/ripper/test_parser_events.rb (TestRipper#test_block_variables):
-	  Limit address space 100MB instead 100KB. Quite frankly, This
-	  margin is too narrow to contain ruby. [ruby-dev:42763] [Bug#4159]
-
-Tue Dec 14 23:53:52 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* io.c (simple_sendfile): improve linux compatibility on FreeBSD,
-	  and now it works. But without cpuset -l 0, it still gets stuck.
-
-Tue Dec 14 20:31:33 2010  Tanaka Akira  <akr@fsij.org>
-
-	* gc.c: parenthesize macro arguments.
-
-Tue Dec 14 18:31:48 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* lib/test/unit.rb: help messages.
-
-Tue Dec 14 18:19:03 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* common.mk (help): there is no reason to use the abbreviation for here.
-
-Tue Dec 14 15:03:46 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* test/ruby/test_io.rb (test_reopen, test_reinitialize): should close
-	  the temporary files.
-
-Tue Dec 14 14:24:15 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* test/ruby/test_io.rb (make_tempfile): change the prefix from 'foo'
-	  to 'test_io' because the old one is meaningless and inconvenient.
-
-	* test/ruby/test_io.rb (test_binmode_after_closed): the temporary file
-	  made by make_temfile is already closed.
-
-Tue Dec 14 13:52:19 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* test/ruby/test_io.rb (test_flush_in_finalizer[12]): should close
-	  temporary file because it's only used for taking pathname and
-	  unlinking the file after the end of the test (in GC phase).
-
-Tue Dec 14 13:34:33 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* ext/zlib/zlib.c (gzfile_s_open): should close the IO if some error
-	  occurs in initializing.
-
-Tue Dec 14 13:04:16 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* lib/net/http.rb (Net::HTTPRequest#send_request_body_data):
-	  set binmode to tempfile.
-
-Tue Dec 14 12:55:46 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* test/zlib/test_zlib.rb (*): should close files associated with zlib.
-
-Tue Dec 14 11:30:17 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* test/ruby/test_argf.rb (test_inplace_rename_impossible): unlink
-	  the renamed temporary file on no_safe_rename platforms.
-
-	* test/ruby/test_argf.rb (test_readlines_limit_0,
-	  test_each_line_limit_0): should close argf because the associated
-	  Tempfile object cannot unlink the temporary file when it's gc'ed
-	  on some platforms (Windows, etc.)
-
-Tue Dec 14 11:27:07 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* lib/minitest/unit.rb (Minitest::Unit#_run_suite): split test
-	  name and its time. Thiw allows to know test's name when you are
-	  running tests and meet a test which spends long time at realtime.
-
-Tue Dec 14 11:25:20 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* configure.in: Add -Werror=declaration-after-statement to default
-	  warning flag. If you are using GCC, this flag is useful to
-	  prevent breaking VC build.
-
-Tue Dec 14 10:25:57 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* ext/openssl/ossl_asn1.c (ossl_asn1_decode0): how many gcc-c99isms
-	  must a man mend; before he can build with VC? r30178
-
-Mon Dec 13 21:26:33 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* io.c (simple_sendfile): disable the use of sendfile(2) on
-	  FreeBSD. It blocks on TestIO#test_copy_stream_socket.
-
-Mon Dec 13 18:35:33 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* io.c: define USE_SENDFILE on FreeBSD or DragonFly BSD.
-	  Remove Mac OS X because its argument is different from them.
-
-Mon Dec 13 12:00:09 2010  Tanaka Akira  <akr@fsij.org>
-
-	* file.c: parenthesize macro arguments.
-
-Mon Dec 13 11:21:14 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* io.c (simple_sendfile): added for BSD version of sendfile(2).
-
-Mon Dec 13 09:50:09 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* lib/net/http.rb (Net::HTTPRequest#set_form): Added to support
-	  both application/x-www-form-urlencoded and multipart/form-data.
-	  There is a similar API, Net::HTTPRequest#set_form_data, but
-	  to keep its compatibility this is newly added. [ruby-dev:42729]
-
-Sun Dec 12 23:45:27 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* compile.c (iseq_compile_each): fix for __goto__ and __label__
-	  where were totally broken.
-
-Sun Dec 12 22:45:43 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* common.mk (ID_H_INCLUDES): now id.h depends on vm_opts.h.
-
-Sun Dec 12 20:42:47 2010  Kazuhiro NISHIYAMA  <zn@mbf.nifty.com>
-
-	* template/id.h.tmpl: suppress all warning: "SUPPORT_JOKE" is not
-	  defined.  [ruby-dev:42730]
-
-Sun Dec 12 20:35:07 2010  Kazuhiro NISHIYAMA  <zn@mbf.nifty.com>
-
-	* misc/rb_optparse.zsh: update how to install.
-
-	* misc/rb_optparse.zsh: avoid error when setopt noclobber.
-
-	* lib/optparse.rb: fix typo. pointed out at
-	  <http://d.hatena.ne.jp/nagachika/20101207>.
-
-Sun Dec 12 13:27:35 2010  Tanaka Akira  <akr@fsij.org>
-
-	* eval_error.c: parenthesize macro arguments.
-
-Sun Dec 12 11:53:24 2010  Tanaka Akira  <akr@fsij.org>
-
-	* error.c: parenthesize macro arguments.
-
-Sun Dec 12 04:01:58 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* string.c (rb_str_inspect): fix: extra back slash is added when
-	  the string is dummy encoding and includes \x22 or \x5C.
-
-Sun Dec 12 02:42:24 2010  Aaron Patterson <aaron@tenderlovemaking.com>
-
-	* ext/openssl/ossl_asn1.c: indefinite length BER to DER encoding is
-	  properly supported.  Thanks Martin Bosslet! [ruby-core:33082]
-
-Sat Dec 11 17:43:34 2010  Kazuhiro NISHIYAMA  <zn@mbf.nifty.com>
-
-	* ext/bigdecimal/bigdecimal.h: suppress "warning: 'VPrint' declared
-	  'static' but never defined".
-
-Sat Dec 11 09:24:57 2010  Tanaka Akira  <akr@fsij.org>
-
-	* encoding.c: parenthesize macro arguments.
-
-Sat Dec 11 08:12:48 2010  Eric Hodel  <drbrain@segment7.net>
-
-	* ext/openssl/ossl.c, ext/openssl/ossl_pkey_rsa.c: Document RSA, RSA
-	  encryption/decryption and PKCS #5 encryption/decryption.
-
-Sat Dec 11 06:23:41 2010  Eric Hodel  <drbrain@segment7.net>
-
-	* ext/openssl/ossl_x509name.c: include Comparable to provide #==.
-	  Document OpenSSL::X509::Name#<=>.  [Ruby 1.9-Feature#4116]
-
-Sat Dec 11 05:48:28 2010  Hidetoshi NAGAI  <nagai@ai.kyutech.ac.jp>
-
-	* ext/tk/lib/multi-tk.rb: infinite loop on method_missing at loading.
-	  [ruby-dev:42716] [Ruby 1.9-Bug#4129]
-
-	* ext/tk/lib/multi-tk.rb: when no eventloop is running, ruby freezes at
-	  exit.
-
-Sat Dec 11 02:23:15 2010  Aaron Patterson <aaron@tenderlovemaking.com>
-
-	* ext/openssl/extconf.rb: try pkgconfig first, then fall back to
-	  normal have_library, etc.  Thanks Erik Hollensbe. [ruby-core:32406]
-
-Fri Dec 10 22:33:39 2010  Tanaka Akira  <akr@fsij.org>
-
-	* dln_find.c: parenthesize macro arguments.
-
-Fri Dec 10 20:05:42 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* template/id.h.tmpl (ruby_method_ids): suppress warnings.
-	  [ruby-dev:42730]
-
-Fri Dec 10 18:29:20 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* ruby.c (ruby_init_loadpath_safe): relatively called non-shared
-	  binary cannot be found in PATH, so use given pathname.
-
-Fri Dec 10 18:28:40 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* cygwin/GNUmakefile.in (SCRIPTPROGRAMS): ignore backup files and etc.
-
-	* cygwin/GNUmakefile.in (scriptbin): set executable bit.
-
-	* tool/rbinstall.rb (install_recursive): always skip default ignored
-	  files.  if block is given, call it instead of calling install.
-
-	* tool/rbinstall.rb (bin-comm): use install_recursive.
-
-Fri Dec 10 18:12:31 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* test/mkmf/base.rb (TestMkmf#config_value): extract macro value from
-	  config.h.
-
-	* test/mkmf/test_sizeof.rb (TestMkmf::TestSizeof#test_sizeof_builtin),
-	  (TestMkmf::TestSizeof#test_sizeof_struct): more tests.
-
-	* lib/mkmf.rb (check_signedness): should use the prelude code.
-	  [ruby-dev:42731]
-
-	* lib/mkmf.rb (Logging.log_close): separate from Logging.logfile.
-
-	* test/mkmf/base.rb (TestMkmf::MKMFLOG): show mkmf.log at failures.
-
-	* test/mkmf/base.rb (TestMkmf#teardown): close log file for each tests.
-
-Fri Dec 10 11:36:43 2010  Kazuhiro NISHIYAMA  <zn@mbf.nifty.com>
-
-	* compile.c (enum): remove a comma at end of enumerator list.
-
-	* constant.h (rb_const_flag_t): ditto.
-
-	* iseq.h (enum catch_type): ditto.
-
-	* iseq.h (enum defined_type): ditto.
-
-	* vm_core.h (enum iseq_type): ditto.
-
-	* vm_core.h (enum vm_special_object_type): ditto.
-
-Fri Dec 10 10:47:53 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* sprintf.c (_HAVE_SANE_QUAD_): Don't forget LP64, r30156.
-
-Fri Dec 10 10:37:17 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* sprintf.c (_HAVE_SANE_QUAD_): if a certain platform has LONG_LONG in
-	  8 byte, it might be sane quad. [ruby-core:33634]
-
-Fri Dec 10 10:07:59 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* lib/net/http.rb: remove version 1.1 features.
-
-Fri Dec 10 02:18:02 2010  Aaron Patterson <aaron@tenderlovemaking.com>
-
-	* ext/openssl/ossl_x509store.c (ossl_x509stctx_cleanup): removing C
-	  implementation of `cleanup`.
-
-	* ext/openssl/lib/openssl/x509.rb: adding ruby implementation of
-	  `cleanup`.  OpenSSL::X509::StoreContext#cleanup is deprecated since
-	  reusing the underlying struct doesn't make sense. [ruby-dev:42546]
-
-Thu Dec  9 20:14:39 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* parse.y (lvar_defined_gen, shadowing_lvar_gen, dvar_defined): no
-	  warnings for unused method and block arguments.
-	  [ruby-dev:42718] [ruby-dev:42724]
-
-Thu Dec  9 19:25:49 2010  Tanaka Akira  <akr@fsij.org>
-
-	* dln.c: parenthesize macro arguments.
-
-Thu Dec  9 18:51:06 2010  Tanaka Akira  <akr@fsij.org>
-
-	* lib/webrick/accesslog.rb (WEBrick::AccessLog#format): support
-	  %{remote}p for logging remote (client) port number.
-	  [ruby-dev:42670]
-
-Thu Dec  9 11:00:30 2010  Yukihiro Matsumoto  <matz@ruby-lang.org>
-
-	* array.c (rb_ary_dup): should copy contents only.  no instance
-	  variable, no class would be copied.  it would affect methods
-	  #sort, #reject, #transpose, #uniq, #compact, and #shuffle.
-	  [ruby-core:33640]
-
-	* array.c (rb_ary_reverse_m): ditto.
-
-	* array.c (rb_ary_rotate_m): ditto.
-
-Wed Dec  8 21:38:40 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* ext/dl/lib/dl/struct.rb: clean a warning: assigned but unused
-	  variable. patched by Kouhei Yanagita. [ruby-dev:42722]
-
-	* ext/dl/lib/dl/import.rb: ditto.
-
-Wed Dec  8 21:36:16 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* parse.y (shadowing_lvar_gen): fix line number.  [ruby-dev:42718]
-
-Wed Dec  8 20:37:11 2010  Tanaka Akira  <akr@fsij.org>
-
-	* dir.c: parenthesize macro arguments.
-
-Tue Dec  7 22:37:15 2010  Masaya Tarui  <tarui@ruby-lnag.org>
-
-	* io.c (io_read): duplicate string if shared. [ruby-dev:42719]
-
-Tue Dec  7 22:31:08 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* lib/optparse.rb (OptionParser::Officious): separate completion
-	  options from --help.  [ruby-dev:42690]
-
-	* lib/optparse.rb (OptionParser::Completion#candidate),
-	  (OptionParser::Switch#compsys): remove unused variables.
-
-Tue Dec  7 22:05:25 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* transcode.c (transcode_loop): call default handler of the given
-	  hash, method, proc or [] method as fallback.  [ruby-dev:42692]
-
-Tue Dec  7 21:59:37 2010  Kouhei Sutou  <kou@cozmixng.org>
-
-	* lib/rexml/light/node.rb: remove circular require.
-
-Tue Dec  7 21:56:01 2010  Kouhei Sutou  <kou@cozmixng.org>
-
-	* test/rexml/test_light.rb: really suppress a warning.
-
-Tue Dec  7 21:51:57 2010  Kouhei Sutou  <kou@cozmixng.org>
-
-	* test/rexml/test_light.rb: suppress a warning.
-
-Tue Dec  7 21:14:03 2010  Tanaka Akira  <akr@fsij.org>
-
-	* debug.c: parenthesize macro arguments.
-
-Tue Dec  7 21:06:38 2010  Kouhei Sutou  <kou@cozmixng.org>
-
-	* lib/rexml/doctype.rb, test/rexml/test_doctype.rb: suppress warnings.
-	  [ruby-core:33305]
-	  Reported by Aaron Patterson. Thanks!!!
-
-Tue Dec  7 18:56:52 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* ext/nkf/lib/kconv.rb (String#kconv): fix typo and update rdoc.
-	  patched by Kouhei Yanagita [ruby-dev:42696]
-
-Tue Dec  7 20:32:11 2010  Kouhei Sutou  <kou@cozmixng.org>
-
-	* test/rexml/test_doctype.rb: add Accessor to test case name.
-
-Tue Dec  7 20:31:02 2010  Kouhei Sutou  <kou@clear-code.com>
-
-	* test/rexml/test_doctype.rb: Doctype -> DocType.
-
-Tue Dec  7 20:29:23 2010  Kouhei Sutou  <kou@clear-code.com>
-
-	* test/rexml/test_doctype_mixin.rb: rename to ...
-	* test/rexml/test_doctype.rb: ... this to remove needless name.
-
-Tue Dec  7 17:03:16 2010  Shugo Maeda  <shugo@ruby-lang.org>
-
-	* lib/net/imap.rb (xlist): supported the XLIST command, which is an
-	  extension by Apple and Google.  patch by Geoff Youngs.
-	  [ruby-core:33521]
-
-Tue Dec  7 08:00:44 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* configure.in, win32/Makefile.sub (WERRORFLAG): flag to treat
-	  warnings as errors.
-
-	* lib/mkmf.rb (Logging.postpone): yield log file object.
-
-	* lib/mkmf.rb (xsystem): add options, :werror only right now.
-
-	* lib/mkmf.rb (with_werror): check as if warnings are errors.
-
-	* lib/mkmf.rb (convertible_int): make declaration conflict
-	  warnings errors not to pass wrong type.  [ruby-dev:42684]
-
-	* lib/mkmf.rb (COMMON_MACROS): get rid of conflicts.
-
-	* win32/Makefile.sub (WARNFLAGS): make declaration conflict
-	  warnings errors if possible.
-
-Sun Dec  7 21:16:10 2010  Tanaka Akira  <akr@fsij.org>
-
-	* cont.c: parenthesize macro arguments.
-
-Tue Dec  7 00:27:14 2010  Masaya Tarui  <tarui@ruby-lnag.org>
-
-	* win32/win32.c (rb_w32_read): fixed more for readline,
-	  and so on. [ruby-core:33511]
-
-Mon Dec  6 23:18:22 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* test/mkmf/base.rb (TestMkmf#setup): run quietly.
-
-	* test/mkmf/test_find_executable.rb (test_find_executable): use
-	  configured results.
-
-	* common.mk (test-build): test for build process.
-
-Mon Dec  6 22:47:15 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* lib/optparse.rb (OptionParser#candidate): skip separators.
-
-	* sample/optparse/opttest.rb: should not override --help.
-	  [ruby-dev:42690]
-
-Mon Dec  6 19:00:48 2010  Kazuhiro NISHIYAMA  <zn@mbf.nifty.com>
-
-	* misc/rb_optparse.zsh: fix typos.
-
-Mon Dec  6 18:59:04 2010  Kazuhiro NISHIYAMA  <zn@mbf.nifty.com>
-
-	* NEWS: add new encodings.
-
-Mon Dec  6 18:56:42 2010  Kazuhiro NISHIYAMA  <zn@mbf.nifty.com>
-
-	* test/ruby/test_string.rb (TestString#test_scan): add a test for
-	  [ruby-core:33338] #4087.
-
-Mon Dec  6 18:55:36 2010  Kazuhiro NISHIYAMA  <zn@mbf.nifty.com>
-
-	* test/uri/test_common.rb (TestCommon#test_encode_www_form): add
-	  tests for r30015.
-
-Mon Dec  6 10:39:54 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* lib/uri/common.rb (URI::Parser#initialize_pattern):
-	  refix for restrict the pattern.
-
-Mon Dec  6 09:45:11 2010  Eric Hodel  <drbrain@segment7.net>
-
-	* ext/openssl (OpenSSL): add toplevel documentation
-	* ext/openssl/ossl_ssl.c (SSLContext, SSLSocket: add additional
-	  documentation
-	* ext/openssl: move "let rdoc know about mOSSL" comments so they don't
-	  show up in output
-
-Mon Dec  6 09:16:46 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* lib/uri/common.rb (URI::Parser#initialize_pattern):
-	  workaround fix pattern of hostname for RFC 3986. [ruby-dev:42672]
-
-Mon Dec  6 09:14:38 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* lib/mkmf.rb (check_signedness): rename unused variable prelude.
-
-Sun Dec  5 17:56:36 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* class.c (make_metaclass): fix probable typo.  builtin type flag
-	  cannot be used with FL_TEST.
-
-Sun Dec  5 12:09:27 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* lib/irb/init.rb (IRB.parse_opts): fix typo. [ruby-core:33574]
-
-Sun Dec  5 11:27:08 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* ruby.c (load_file_internal): decrement for ungotten line.
-	  [ruby-dev:42680]
-
-Sun Dec  5 10:32:11 2010  Tanaka Akira  <akr@fsij.org>
-
-	* complex.c: parenthesize macro arguments.
-
-Sat Dec  4 11:39:17 2010  Eric Hodel  <drbrain@segment7.net>
-
-	* ext/openssl/ossl_x509ext.c (initialize): add documentation.
-
-Sat Dec  4 11:21:50 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* hash.c (rb_hash_update_by): new API for Hash#update.
-
-Sat Dec  4 11:18:10 2010  Tanaka Akira  <akr@fsij.org>
-
-	* class.c: parenthesize macro arguments.
-
-Sat Dec  4 11:07:57 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* vm_core.h (rb_vm_inc_const_missing_count): missing prototype.
-
-Sat Dec  4 08:50:10 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* ext/iconv/iconv.c (Init_iconv): no warnings if $VERBOSE is nil.
-
-Sat Dec  4 08:25:15 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* vm_insnhelper.c (vm_call_method): revert r30064 and r30071,
-	  because of [ruby-core:26761]. Bug#4106 rejected.
-
-Sat Dec  4 07:46:48 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* lib/mkmf.rb (String#tr_cpp): substitute * with P like as
-	  autoconf.
-
-Fri Dec  3 22:36:45 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* vm_insnhelper.c (vm_call_method): protected methods should be
-	  checked against the real class.
-
-Fri Dec  3 20:23:31 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* lib/mkmf.rb (convertible_int): define printf format prefix too.
-
-	* lib/mkmf.rb (convertible_int): detect convertible integer type.
-	  port RUBY_REPLACE_INT from configure.in.
-
-	* lib/mkmf.rb (check_sizeof): should return integer always.
-
-Fri Dec  3 12:54:48 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* win32/Makefile.sub (RCFLAGS): VC10 and after only. fixed the problem
-	  of r30015. [ruby-core:33530]
-
-Fri Dec  3 12:41:52 2010  URABE Shyouhei  <shyouhei@ruby-lang.org>
-
-	* gc.c (rb_objspace_free): With our "lazy-sweep" GC engine, it is
-	  possible for an object to survive until its surrounding object
-	  space is about to be freed.  Those objects, if any, remains
-	  leaked for the rest of a process life.  This is problematic
-	  because for instance a T_DATA object may have its own destructor
-	  to terminate something.
-
-	* vm.c (ruby_vm_destruct): ruby_current_vm termination should be
-	  somewhere after rb_objspace_free for above reason.
-
-Fri Dec  3 12:17:19 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* vm_insnhelper.c (vm_call_method): protected singleton methods should
-	  be visible from same real class methods.  [ruby-core:33506]
-
-Fri Dec  3 07:08:42 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* ext/stringio/stringio.c (strio_getline): round upto next char
-	  boundary.  [ruby-dev:42674]
-
-Fri Dec  3 06:52:46 2010  Tanaka Akira  <akr@fsij.org>
-
-	* compile.c: parenthesize macro arguments.
-
-Fri Dec  3 04:08:59 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* encoding.c (enc_alias_internal): use st_insert2 and change return
-	  value to int.
-
-	* encoding.c (enc_alias): follow enc_alias_internal.
-
-Fri Dec  3 01:52:43 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* encoding.c (enc_alias_internal): use xfree instead of free.
-
-Thu Dec  2 23:52:26 2010  URABE Shyouhei  <shyouhei@ruby-lang.org>
-
-	* NEWS: entry for ruby_vm_at_exit().
-
-	* eval.c (ruby_cleanup): bug fix around at_exit (1) timing was
-	  wrong. (2) execution order was opposite.
-
-Thu Dec  2 23:05:14 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* win32/Makefile.sub (RCFLAGS): -nologo switch is only available in
-	  newer versions of rc.exe. fixed the problem of r30012.
-
-Thu Dec  2 21:28:07 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* ext/json/lib/json/add/rails.rb: removed.
-
-Thu Dec  2 21:22:05 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* encoding.c (enc_alias_internal): free the copied key and
-	  return NULL when given key is already registered.
-
-	* encoding.c (enc_alias): call set_encoding_const only when the
-	  alias is not registered yet.
-
-Thu Dec  2 19:58:24 2010  URABE Shyouhei  <shyouhei@ruby-lang.org>
-
-	* vm.c (ruby_vm_at_exit): new API.  This enables extension libs to
-	  hook a VM termination.  Right now, because the VM we have is
-	  process global, most extensions do not deallocate resources and
-	  leave them to Operating System's reaping userland processes.  But
-	  in a future we plan to have multiple VMs to run simultaneously in
-	  a single process (MVM project).  At that stage we can no longer
-	  rely on OSes and have to manage every resources to be reclaimed
-	  properly.  So it is.  For a forward-compatibility reason this API
-	  is introduced now, encouraging you to be as gentle as you can for
-	  your resources; that is, tidy up your room.
-
-	* include/ruby/vm.h: ditto.
-
-	* vm_core.h (rb_vm_struct): new field.
-
-	* vm.c (vm_init2): initialize above new field.
-
-	* eval.c (ruby_cleanup): trigger those hooks.
-
-Thu Dec  2 17:00:44 2010  Tanaka Akira  <akr@fsij.org>
-
-	* bignum.c: parenthesize macro arguments.
-
-Thu Dec  2 15:31:14 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* win32/win32.c (rb_w32_read): more fix. [ruby-core:33513]
-
-Thu Dec  2 13:41:43 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* win32/win32.c (rb_w32_read): workaround for console reading troubles.
-	  fixed [ruby-core:33511]
-
-Thu Dec  2 13:10:42 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* lib/uri/common.rb (URI.encode_www_form):
-	  split key-value when the value is Array like object.
-
-Thu Dec  2 10:39:39 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* lib/net/http.rb (Net::HTTP#set_form_data):
-	  use URI.encode_www_form for application/x-www-form-urlencoded.
-
-Thu Dec  2 10:38:40 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* ext/extmk.rb: remove $makeflags.defined?, it should be $mflags.
-
-Thu Dec  2 10:19:47 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* win32/Makefile.sub (rc): suppress meaningless message.
-
-Thu Dec  2 10:09:40 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* ext/json/generator/extconf.rb: remove the lines which set -O3
-	  when -O option is not set.
-	  Note that -O3 doesn't always exist.
-
-	* ext/json/parser/extconf.rb: ditto.
-
-Thu Dec  2 10:01:59 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* ext/extmk.rb: define $makeflags.defined? like $mflags.
-
-Thu Dec  2 07:20:20 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* lib/test/unit.rb (Test::Unit::GCStressOption): --gc-stress
-	  option.
-
-	* lib/test/unit.rb (Test::Unit::Mini#_run_suites): show the result
-	  even when interrupted on the way.
-
-Thu Dec  2 07:08:38 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* ext/io/console/console.c (setattr): should retry on EINTR.
-	  [ruby-dev:42666]
-
-Thu Dec  2 02:30:50 2010  Eric Hodel  <drbrain@segment7.net>
-
-	* lib/net/http.rb: fixed positional wording to match revised order.
-
-Thu Dec  2 01:24:39 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* ext/json/lib/json/common.rb: don't use iconv on 1.9.
-	  patched by Shota Fukumori [ruby-core:33164]
-
-Thu Dec  2 01:02:03 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* ext/json: Update github/flori/json from 1.4.2+ to
-	  e22b2f2bdfe6a9b0. this fixes some bugs.
-
-Thu Dec  2 00:05:44 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* lib/net/http.rb: improve rdoc.
-	  This change the order of chapter because such overview should
-	  begin with simple examples.
-	  patched by Eric Hodel [ruby-core:33469]
-
-Wed Dec  1 22:01:49 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* numeric.c (Init_Numeric): fixed a potential bug when using bccwin32
-	  ruby with Microsoft's dll, though we already gave up of supporting
-	  bccwin32. [ruby-core:33503]
-
-Wed Dec  1 21:43:21 2010  Tanaka Akira  <akr@fsij.org>
-
-	* array.c: parenthesize macro arguments.
-
-Wed Dec  1 21:41:57 2010  Tanaka Akira  <akr@fsij.org>
-
-	* test/socket/test_addrinfo.rb: extract Errno::EADDRINUSE as a method.
-
-	* test/socket/test_socket.rb: ditto.
-
-Wed Dec  1 15:08:32 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* test/openssl/test_ssl.rb (test_not_started_session): non socket
-	  argument of SSLSocket.new is not supported on Windows.
-
-Wed Dec  1 14:36:36 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* string.c (rb_memhash): zero-filled strings should return
-	  different values.  [ruby-core:33500]
-
-Wed Dec  1 14:27:49 2010  Ryan Davis  <ryand-ruby@zenspider.com>
-
-	* lib/minitest/*.rb: Imported minitest 2.0.0 r5952.
-	* test/minitest/*.rb: ditto.
-	* lib/test/unit.rb: Compatibility fix for minitest changes.
-
-Wed Dec  1 10:16:41 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* string.c (rb_str_inspect): fix typo (not 0xFD but 0xFE).
-
-Wed Dec  1 09:28:27 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* addr2line.c: Follow .gnu_debuglink section.
-	  A user of distribution provided ruby will see line
-	  info if s/he has a debug package for ruby.
-	  patched by Shinichiro Hamaji [ruby-dev:42655]
-
-Wed Dec  1 01:29:15 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* string.c (rb_str_inspect): inspect as a dummy encoding string
-	  when a UTF-16/32 (not BE/LE) string does not have a BOM.
-	  Unicode and some RFCs say that a string labeled as UTF-16/32
-	  doesn't have a BOM, it should be considered big endian.
-	  But many Windows programs generates little endian UTF-16
-	  strings without a BOM. So String#inspect treats a string
-	  labeled UTF-16/32 without a BOM as a dummy encoding string.
-	  patched by Martin Duerst. [ruby-core:33461]
-
-Tue Nov 30 17:04:10 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* addr2line.c (parse_debug_line_cu): ignore DW_LNE_set_discriminator.
-	  To ignore, it needs to read a single unsigned LEB128 integer.
-
-Tue Nov 30 16:29:19 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* vm_dump.c: undef HAVE_BACKTRACE when the OS is FreeBSD (in other
-	  words backtrace() is libexecinfo) and it is optimized.
-	  This temporary hack may be also applied to other libexecinfo
-	  environments.
-
-Tue Nov 30 16:23:23 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* lib/net/http.rb: improve rdoc.
-	  patched by Eric Hodel ref #4100
-
-Tue Nov 30 12:23:52 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* win32/win32.c (rb_w32_read): read only 1 byte at once on console.
-	  workaround of Windows bug. see [ruby-core:33460].
-	  this is not the final solution.
-
-Tue Nov 30 11:39:13 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* lib/net/http.rb: improve rdoc.
-	  patched by mathew murphy [ruby-core:33472] ref #4100
-
-Tue Nov 30 05:03:44 2010  Eric Hodel  <drbrain@segment7.net>
-
-	* lib/uri/common.rb (encode_www_form, encode_www_form_component):
-	  Improve English in documentation.
-
-	* ext/openssl/ossl_ssl.c (ssl_version=, ciphers=): Document
-	  #ssl_version=, add documentation for #ciphers=.
-
-Mon Nov 29 22:55:24 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* lib/uri/common.rb (URI::WFKV_): get rid of backtrack explosion
-	  by nested repeat operators.  [ruby-core:33464]
-
-Mon Nov 29 22:53:13 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* win32/Makefile.sub (scriptbin.mk): fix generated rules.
-
-	* win32/win32.c (rb_w32_write_console): fix argument type.
-
-Mon Nov 29 21:12:51 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* misc/ruby-mode.el (ruby-forward-sexp): stop after literal hash
-	  key labels.
-
-	* misc/ruby-mode.el (ruby-font-lock-keywords): highlight literal
-	  hash key labels as symbols.
-
-Mon Nov 29 18:31:31 2010  Martin Duerst  <duerst@it.aoyama.ac.jp>
-
-	* test/ruby/test_transcode.rb (test_unicode_public_review_issue_121):
-	  - Removed commented-out options that are no longer under discussion.
-	  - Added two more tests for forthcomming clarifications.
-
-Mon Nov 29 14:31:17 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* win32/win32.c (rb_w32_isatty): use GetConsoleMode() to determine the
-	  fd is console or not, just like rb_w32_write_console(). [experimental]
-
-Mon Nov 29 14:19:40 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* include/ruby/win32.h (rb_w32_write_console): wrong prototype.
-
-Mon Nov 29 14:10:55 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* win32/win32.c (rb_w32_write_console): fixed indentation.
-
-Sun Nov 28 22:13:39 2010  Koichi Sasada  <ko1@atdot.net>
-
-	* thread_pthread.c (NATIVE_MUTEX_LOCK_DEBUG): move and use it.
-
-	* ChangeLog: fix my timezone.
-
-Mon Nov 28 21:58:58 2010  Koichi Sasada  <ko1@atdot.net>
-
-	* thread_pthread.c: remove pthread_atfork().
-
-Mon Nov 28 21:54:22 2010  Koichi Sasada  <ko1@atdot.net>
-
-	* thread_pthread.c (native_cond_*): Check return code.
-	  (Some OSes except Linux return error code).
-
-Sun Nov 28 21:46:21 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* thread_pthread.c (thread_start_func_1): initialize native thread
-	  data immediately before starting.
-
-Sun Nov 28 14:56:32 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* io.c (struct argf): make lineno long, and reorder members.
-
-Sun Nov 28 14:55:42 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* thread_win32.c (gvl_release, gvl_init): suppress warnings.
-
-Sun Nov 28 14:48:24 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* thread_pthread.c (gvl_release, gvl_init): suppress warnings.
-
-	* vm_core.h (rb_vm_gvl_destroy): add prototype.
-
-Sun Nov 28 14:46:24 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* thread_pthread.c (gvl_reinit): register atfork handler only in
-	  the parent process, to get rid of dead lock.
-
-Sun Nov 28 12:23:57 2010  Koichi Sasada  <ko1@atdot.net>
-
-	* thread.c, vm_core.h: make gvl_acquire/release/init/destruct
-	  APIs to modularize GVL implementation.
-
-	* thread_pthread.c, thread_pthread.h: Two GVL implementations.
-	  (1) Simple locking GVL which is same as existing GVL.
-	  (2) Wake-up queued threads.  The wake-up order is simple FIFO.
-	     (We can make several queues to support exact priorities, however
-	      this causes some issues such as priority inversion and so on.)
-	      This impl. prevents spin-loop (*1) caused on SMP environments.
-	  *1: Only one Ruby thread acquires GVL again and again.
-	      Bug #2359 [ruby-core:26694]
-
-	* thread_win32.c, thread_win32.h: Using simple lock
-	  not by CRITICAL_SECTION but by Mutex.
-	  Bug #3890 [ruby-dev:42315]
-
-	* vm.c (ruby_vm_destruct): ditto.
-
-Sun Nov 28 04:40:00 2010  Luis Lavena  <luislavena@gmail.com>
-
-	* io.c (io_fwrite): use rb_w32_write_console under Windows.
-
-	* win32/win32.c (rb_w32_write_console): added to write to write
-	  Unicode using WriteConsoleW for stdout/stderr. [ruby-core:33166]
-
-Sun Nov 28 03:58:47 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* lib/net/http.rb: improve rdoc.
-	  patched by Mike Perham [ruby-core:33433]
-
-Sat Nov 27 19:12:10 2010  Tanaka Akira  <akr@fsij.org>
-
-	* time.c: parenthesize macro arguments.
-
-Sat Nov 27 18:08:18 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* time.c (leap_year_v_p): fixed typo.  [ruby-dev:42631]
-
-Sat Nov 27 17:57:08 2010  Tanaka Akira  <akr@fsij.org>
-
-	* resolv.rb (Resolv::DNS): use the same DNS server when retry using
-	  TCP.  reported by Julian Mehnle.  [ruby-core:32970]
-
-Sat Nov 27 15:45:27 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* vm_dump.c (rb_vm_bugreport): see CrashReport log on Mac OS X.
-
-	* configure.in: link addr2line only for ELF.
-
-Sat Nov 27 13:58:55 2010  Shugo Maeda  <shugo@ruby-lang.org>
-
-	* lib/optparse.rb (OptionParser#candidate): : was missing.  Thanks,
-	  Shota Fukumori.  [ruby-dev:42634]
-
-Sat Nov 27 12:07:05 2010  Yukihiro Matsumoto  <matz@ruby-lang.org>
-
-	* man/ruby.1: Ruby man page from Arthur Gunn in [ruby-core:33412]
-
-Sat Nov 27 11:29:24 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* lib/optparse.rb (OptionParser#candidate): get rid of 1.9 syntax
-	  so that BASERUBY can be 1.8.
-
-Sat Nov 27 08:16:21 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* addr2line.c (rb_dump_backtrace_with_lines): should close fd on
-	  edge case.
-
-Fri Nov 26 13:33:24 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* addr2line.c: apply a patch from shinichiro.h.
-
-Fri Nov 26 12:21:20 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* addr2line.c: added to show source filename and line number of
-	  functions in backtrace. [ruby-dev:42625]
-	  a patch from shinichiro.h <shinichiro.hamaji AT gmail.com>
-
-	* addr2line.h: ditto.
-
-	* common.mk: add addr2line.$(OBJEXT).
-
-	* configure.in: check dl_iterate_phdr.
-
-	* vm_dump.c (rb_vm_bugreport): use rb_dump_backtrace_with_lines in
-	  addr2line.c when the binary is ELF.
-
-Fri Nov 26 12:12:50 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* regcomp.c (setup_tree): restart setup_tree() for a node whose
-	  AnchorNode's type is ANCHOR_PREC_BEHIND or ANCHOR_PREC_BEHIND_NOT
-	  and divide_look_behind_alternatives() divided it to NT_ALT or
-	  NT_LIST. [ruby-core:33370]
-
-Fri Nov 26 11:40:11 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* vm_dump.c (dump_thread): get only required rights of the target
-	  thread because THREAD_ALL_ACCESS causes an access error on XP.
-	  reported by Masaya TARUI via IRC.
-
-Fri Nov 26 11:09:07 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* vm_dump.c (dump_thread): show the displacement from the beginning
-	  of the symbol.
-
-Fri Nov 26 10:48:23 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* vm_dump.c (dump_thread): follow the output of glibc.
-	  see [ruby-dev:42627]
-
-Fri Nov 26 09:48:45 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* re.c (rb_reg_initialize_str): should succeed the taint status from
-	  the origin. [ruby-core:33338]
-
-Fri Nov 26 09:32:37 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* vm_dump.c (dump_thread): seems to be necessary the 3rd argument of
-	  SymGetLineFromAddr64(), even though MSDN says it can be zero.
-
-Fri Nov 26 09:03:38 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* regcomp.c (onig_is_prelude): added to check whether ruby is still
-	  in prelude (or other boot processes) or not.
-
-	* regcomp.c (optimize_node_left): use onig_is_prelude for printing.
-
-	* regcomp.c (set_optimize_info_from_tree): ditto.
-
-	* regcomp.c (onig_compile): ditto.
-
-	* regcomp.c (print_compiled_byte_code_list): print its address.
-
-	* regcomp.c (print_indent_tree): print its contents tree of
-	    ANCHOR_PREC_READ(_NOT) and ANCHOR_PREC_BEHIND(_NOT).
-
-Thu Nov 25 23:10:49 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* regcomp.c (print_distance_range): use PRIuSIZE.
-
-	* regcomp.c (print_optimize_info): use %ld because the type of
-	  calculated value of integers is long.
-
-	* regexec.c (onig_print_compiled_byte_code): add prototype.
-
-	* regexec.c (match_at): add 2nd argument.
-
-Thu Nov 25 10:29:55 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* ext/dl/callback/mkcallback.rb (gencallback): shouldn't assume that
-	  VALUE is the same size with long.
-
-Thu Nov 25 10:03:14 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* test/win32ole/test_err_in_callback.rb (teardown): remove tmp file
-	  only when it exists.
-
-Thu Nov 25 01:38:25 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* enc/trans/big5-hkscs-tbl.rb: Update table as HKSCS-2008.
-	  patched by oCameLo oTnTh [ruby-core:33256]
-
-	* enc/big5.c: add alias Big5-HKSCS:2008 to Big5-HKSCS.
-
-Wed Nov 24 15:18:07 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* vsnprintf (BSD_vfprintf): use QUADINT macro only when _HAVE_SANE_QUAD_
-	  macro is defined.
-
-Wed Nov 24 12:47:16 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* vsnprintf (BSD_vfprintf): added VC++ compatible size specifications
-	  (I, I32, I64).
-
-Wed Nov 24 11:19:13 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* string.c (rb_str_inspect): treat UTF-16 and UTF-32 as BE or LE.
-
-Wed Nov 24 06:35:32 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* enc/trans/utf_16_32.trans: add the UTF-32 converter.
-
-Wed Nov 24 05:40:33 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-Wed Nov 24 06:13:32 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* win32/win32.c (filecp, wstr_to_mbstr, mbstr_to_wstr):
-	  refactored.
-
-Wed Nov 24 05:40:33 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* enc/trans/utf_16_32.trans: add a converter from UTF-8 to UTF-16.
-
-Wed Nov 24 03:21:35 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* enc/trans/utf_16_32.trans: raise error on unpaired upper
-	  surrogates.
-
-Wed Nov 24 01:40:23 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* enc/utf_16_32.h: add UTF-16 and UTF-32 as a dummy encoding.
-
-	* enc/trans/utf_16_32.trans: add a converter from UTF-16 to UTF-8.
-
-Tue Nov 23 21:59:47 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* win32/win32.c (wlink, rb_w32_getppid): use typedef instead of
-	  repeating complicated function prototypes.
-
-Tue Nov 23 18:54:03 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* vm.c (rb_thread_mark): should mark self in control
-	  frames.  [ruby-core:33289]
-
-Tue Nov 23 07:57:31 2010  Tadayoshi Funaba  <tadf@dotrb.org>
-
-	* lib/date/delta/parser.{ry,rb}: fixed a bug of token scanner.
-
-Tue Nov 23 07:29:24 2010  Tadayoshi Funaba  <tadf@dotrb.org>
-
-	* complex.c, rational.c ({nucomp,nurat}_expt): added a check.
-
-Tue Nov 23 07:27:27 2010  Tadayoshi Funaba  <tadf@dotrb.org>
-
-	* lib/date.rb (daynum): should be private.
-
-Tue Nov 23 07:22:54 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* ChangeLog (change-log-indent-text): hanging indent.
-
-Tue Nov 23 06:30:51 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* configure.in (SITE_DIR, VENDOR_DIR),
-	  version.c (ruby_initial_load_paths): exclude directories that
-	  are configured without them from $LOAD_PATH. [ruby-core:33267]
-
-	* configure.in (rubylibprefix): No ruby, No libprefix.
-
-Tue Nov 23 01:05:27 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* vsnprintf.c (BSD_vfprintf): don't output floating point
-	  when the precision is 0. [ruby-dev:42615]
-
-Mon Nov 22 21:30:57 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* string.c (rb_str_inspect): fix for ascii-compatible external
-	  encoding and different encoding string.  [ruby-core:33283]
-
-Mon Nov 22 18:45:44 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* lib/mkmf.rb (create_makefile): should not duplicate rules.
-	  bug fix of r29842.
-
-Mon Nov 22 18:04:40 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* enc/big5.c: split CP950 from Big5.
-
-	* enc/big5.c: split CP951 from Big5-HKSCS.
-
-	* enc/trans/big5.trans: import conversion table of Big5, Big5-HKSCS,
-	  CP950, and CP951 from ICU. they need fallback conversions.
-	  ref [ruby-core:33256]
-	  http://source.icu-project.org/repos/icu/data/trunk/charset/data/ucm/
-
-	* tool/transcode-tblgen.rb (import_ucm): add to import ucm files.
-
-Mon Nov 22 18:33:30 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* string.c (rb_str_inspect): append for each chars instead of bulk
-	  copy if encoding conversion is needed.  [ruby-core:33283]
-
-Mon Nov 22 14:22:45 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* time.c (time_zone): use rb_locale_str_new_cstr to set encoding
-	  as locale and convert its content to internal encoding.
-	  [ruby-core:33278]
-
-Mon Nov 22 11:58:11 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* string.c (rb_str_concat): set ENC_CODERANGE_VALID when the
-	  receiver is 7BIT and the argument is non ASCII.
-
-Mon Nov 22 01:48:58 2010  Tadayoshi Funaba  <tadf@dotrb.org>
-
-	* lib/date.rb: some improvements for performance.
-
-Sat Nov 20 07:45:50 2010  Aaron Patterson <aaron@tenderlovemaking.com>
-
-	* lib/mkmf.rb: adding compilation support for ObjC/ObjC++ extensions.
-	  Thanks Scott Gonyea! [ruby-core:33260]
-
-Sat Nov 20 01:57:55 2010  Akio Tajima  <artonx@yahoo.co.jp>
-
-	* common.mk: add dependency(insns.inc) to compile.obj
-
-Fri Nov 19 23:05:48 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* win32/Makefile.sub (insns_rules.mk): remove extra backslash.
-
-	* cygwin/GNUmakefile.in, win32/Makefile.sub (clean): rc files are
-	  made at compile time, so should be removed by clean.
-
-Fri Nov 19 22:09:46 2010  Kouhei Sutou  <kou@cozmixng.org>
-
-	* test/rexml/test_core.rb
-	  (Tester#test_pretty_format_long_text_finite): skip a test that
-	  uses long string on small memory system. [ruby-dev:42599]
-
-Fri Nov 19 21:07:06 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* lib/optparse.rb: shell completion support for zsh.  based on
-	  <http://d.hatena.ne.jp/rubikitch/20071002/zshcomplete>
-
-	* lib/optparse.rb: shell completion support for bash.
-
-Fri Nov 19 00:00:00 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* cygwin/GNUmakefile.in (SCRIPTPROGRAMS): no needs on cygwin.
-
-	* win32/Makefile.sub (scriptbin): create script binaries.
-
-Thu Nov 18 23:21:23 2010  Kouhei Sutou  <kou@cozmixng.org>
-
-	* lib/rexml/formatters/pretty.rb (REXML::Formatters::Pretty#wrap):
-	  REXML::Formatters::Pretty#wrap used a recursive method call to
-	  format text.  This switches it to use an iterative approach.
-	  [ruby-core:33245]
-	  Patch by Jeremy Evans. Thanks!!!
-
-	* test/rexml/test_core.rb: add a test for it.
-
-Thu Nov 18 22:58:43 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* include/ruby/io.h (rb_io_buffer_t): extract from rb_io_t.
-
-Thu Nov 18 07:37:44 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* Makefile.in (reconfig): force reconfigure with previous options.
-
-	* common.mk (showconfig): show configure flags, like as
-	  `config.status --config' generated by recent autoconf.
-
-Thu Nov 18 07:16:49 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* missing/langinfo.c (strncasecmp): get rid of redefinition.
-
-Thu Nov 18 00:02:17 2010  James Edward Gray II  <jeg2@ruby-lang.org>
-
-	* lib/csv.rb: Upgrading output encoding with ASCII content
-	  as needed.  [ruby-core:33229]
-
-Wed Nov 17 23:19:21 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* win32/configure.bat: remove quotes from arguments to be quoted.
-
-	* lib/mkmf.rb (create_makefile): use forward slashes in messages.
-
-	* lib/mkmf.rb (create_makefile): make extension libraries messages
-	  brief.
-
-	* win32/Makefile.sub (MAKEDIRS): should not include silent flag.
-
-	* common.mk (ext/ripper/ripper.c, ext/json/parser/parser.c): pass
-	  Q and ECHO.  [ruby-core:33226]
-
-Wed Nov 17 16:09:52 2010  Yuki Sonoda (Yugui)  <yugui@yugui.jp>
-
-	* test/test_tracer.rb: new test case.
-	  minimal regression test for r29280.
-
-Wed Nov 17 16:04:23 2010  Yuki Sonoda (Yugui)  <yugui@yugui.jp>
-
-	* test/ruby/envutil.rb (Test::Unit::Assertions#assert_warn):
-	  new assertion to assert that a particular warning message is
-	  displayed.
-	  forward port from branches/ruby_1_9_2@29795.
-
-Wed Nov 17 15:16:48 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* regint.h (OnigOpInfoType): constify name.
-
-	* regcomp.c (op2name): constify return value.
-
-	* regcomp.c (onig_print_compiled_byte_code): use PRIuPTR and
-	  uintptr_t to clean warnings.
-
-	* regcomp.c (print_indent_tree): use PRIxPTR and intptr_t.
-
-	* regexec.c (match_at): use PRIdPTR and intptr_t.
-
-Wed Nov 17 09:49:10 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* enc/shift_jis.c (property_name_to_ctype): fix memory leak.
-
-	* enc/euc_jp.c (property_name_to_ctype): ditto.
-
-Wed Nov 17 08:54:04 2010  James Edward Gray II  <jeg2@ruby-lang.org>
-
-	* lib/csv.rb: Upgrading output encoding as needed.  [ruby-core:33135]
-
-Tue Nov 16 22:30:39 2010  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* vm_insnhelper.c (vm_throw): remove fear of undefined behavior :-)
-	  Coverity Scan found this bug.
-
-Tue Nov 16 09:33:00 2010  Kenta Murata <mrkn@mrkn.jp>
-
-	* ext/bigdecimal/lib/bigdecimal/util.rb (to_digits): avoid unused
-	  variables warning, reported by Aaron Patterson.
-
-Tue Nov 16 06:39:31 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* pack.c (PACK_ITEM_ADJUST): return nil not result array and yield
-	  values if block is given.  [ruby-core:33193]
-
-Tue Nov 16 00:21:20 2010  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* regparse.c (and_cclass, or_cclass): fix memory leak.  Coverity Scan
-	  found this bug.  [ruby-dev:42579]
-
-Tue Nov 16 00:07:32 2010  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* gc.c (assign_heap_slot): fix fear of memory leak and memory
-	  violation.  Coverity Scan found this bug.
-
-Mon Nov 15 23:54:45 2010  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* eval_intern.h (CHECK_STACK_OVERFLOW): it was not intended to add
-	  size_t to a pointer typed VALUE*.  Coverity Scan found this defect.
-
-Mon Nov 15 23:41:21 2010  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* compile.c (iseq_set_exception_local_table, iseq_set_local_table,
-	  rb_iseq_build_from_ary): fix type inconsistency (which is benign
-	  because sizeof(ID) == sizeof(ID*), though).  Coverity Scan found
-	  these bugs.
-
-Mon Nov 15 22:47:27 2010  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* vm_eval.c (rb_funcall): ensure va_end after va_init_list.  Coverity
-	  Scan found this bug.
-
-Mon Nov 15 08:36:12 2010  Aaron Patterson <aaron@tenderlovemaking.com>
-
-	* lib/racc/parser.rb (do_parse, yyparse): using class eval to define
-	  method and avoid __send__.
-
-Mon Nov 15 06:43:48 2010  Aaron Patterson <aaron@tenderlovemaking.com>
-
-	* etc/openssl/ossl_ssl.c (ossl_ssl_get_cert): raise exception if
-	  pointer is invalid.  Thanks Ippei Obayashi! [ruby-dev:42573]
-
-Sun Nov 14 17:57:45 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* enc/Makefile.in (distclean): should not remove sources which are
-	  distributed in tarball.
-
-Sun Nov 14 16:48:56 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* parse.y (parser_set_token_info): turn on/off with directives.
-	  [ruby-core:25442]
-
-Sun Nov 14 12:05:24 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* io.c (argf_readlines): forward to current_file for arguments
-	  check.  http://twitter.com/nagachika/status/3634254856589312
-
-Sun Nov 14 08:48:06 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* win32/setup.mak (-basic-vars-, -runtime-): suppress trailing
-	  space and compiler command line.
-
-Sun Nov 14 04:22:32 2010  Alexander Zavorine  <alexandre.zavorine@nokia.com>
-
-	* symbian/setup (config.h): Added HAVE_LABS and HAVE_LLABS to config.h.
-
-	* symbian/configure.bat: Changed packaging version in line with API
-	  style 3 versioning.
-
-Sat Nov 13 16:37:56 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* common.mk (showflags, help): emit messages at once.
-
-	* win32/Makefile.sub (MSG, EOM): remove surrounding quotes by %~I.
-
-Sat Nov 13 01:31:30 2010  Akio Tajima <artonx@yahoo.co.jp>
-
-	* win32/Makefile.sub: reorder variable End Of Message (don't display it)
-
-Fri Nov 12 20:52:34 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* common.mk (showflags, help): use caret to quote leading spaces on
-	  Windows.
-
-	* Makefile.in, common.mk, cygwin/GNUmakefile.in, enc/depend,
-	  ext/ripper/depend, lib/mkmf.rb, win32/Makefile.sub: caddle up.
-
-Fri Nov 12 16:35:31 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* configure.in: support C level backtrace information on FreeBSD.
-	  When devel/libexecinfo is installed on FreeBSD, now ruby
-	  can show C level backtrace information.
-	  http://www.freebsd.org/cgi/cvsweb.cgi/ports/devel/libexecinfo/
-
-Fri Nov 12 09:58:30 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* win32/setup.mak: use findstr.exe instead of find.exe, because all
-	  target build platforms should have findstr.exe, and, find.exe often
-	  means another command such as cygwin's.
-
-Fri Nov 12 00:30:19 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* win32/Makefile.sub (config.h): need PRI_LL_PREFIX.
-
-Thu Nov 11 23:38:32 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* configure.in: ANSI C-conforming const and volatile are mandatory
-
-	* configure.in (AC_C_CONST, AC_C_INLINE, AC_C_VOLATILE): check
-	  before used in other checks.
-
-	* configure.in (RUBY_CHECK_PRINTF_PREFIX): should not break from
-	  RUBY_WERROR_FLAG, so that ac_c_werror_flag gets restored.
-
-Thu Nov 11 23:04:44 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* ext/iconv/iconv.c (warn_deprecated): show caller position.
-
-Thu Nov 11 23:03:12 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* io.c (argf_close): untie tied io before closing.
-
-	* io.c (argf_write): add ARGF.write and so on.
-
-	* io.c (argf_read_nonblock): add ARGF.read_nonblock.
-
-Thu Nov 11 21:49:06 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* lib/rdoc/stats.rb (RDoc#print): get rid of NaN.
-
-Thu Nov 11 21:47:12 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* common.mk (SHOWFLAGS): show compile flags.
-
-	* common.mk: hide long command lines by default.  verbose-mode is
-	  turned on by V=1 as before.
-	  http://jarp.does.notwork.org/diary/200605b.html#200605121
-
-Thu Nov 11 21:32:09 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* lib/mkmf.rb (try_func): accept variable address.
-
-	* ext/win32ole/extconf.rb: libuuid is needed on cygwin.
-
-Thu Nov 11 21:24:36 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* file.c (file_expand_path): use cygwin_conv_path on cygwin 1.7 or
-	  later.
-
-	* ruby.c (push_include_cygwin): ditto.
-
-Thu Nov 11 20:49:48 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* include/ruby/ruby.h (PRI_LL_PREFIX): format type specifier for
-	  LONG_LONG may vary on platforms.
-
-Thu Nov 11 20:45:23 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* configure.in (SYMBOL_PREFIX): separate from EXPORT_PREFIX.
-
-	* win32/mkexports.rb (Exports#each_export): use SYMBOL_PREFIX.
-
-Wed Nov 10 07:20:10 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* cygwin/GNUmakefile.in (scriptbin): make executable file from
-	  scripts with stub.
-
-	* ruby.c (load_file_internal): assume xflag for exe file as well
-	  as no-shebang file.
-
-	* tool/rbinstall.rb: install script programs.
-
-	* win32/mkexports.rb (Exports#initialize): alias ruby_sysinit for
-	  stub.
-
-	* win32/stub.c: stub for scripts.  [EXPERIMENTAL]
-
-Tue Nov  9 21:57:45 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* dln.c (init_funcname): allocate and build initialization
-	  function name at once.
-
-Tue Nov  9 21:14:54 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* configure.in (AC_FUNC_GETPGRP, AC_FUNC_SETPGRP): no need when
-	  not used.
-
-	* configure.in (EXPORT_PREFIX): check generic prefix.
-
-Tue Nov  9 13:24:33 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* regenc.c (onigenc_minimum_property_name_to_ctype):
-	  \p{...} should be case insensitive. [ruby-core:33000]
-
-	* regenc.c (onigenc_property_list_add_property):
-	  ditto.
-
-	* enc/euc_jp.c (init_property_list, property_name_to_ctype):
-	  to lowercase property names.
-
-	* enc/shift_jis.c (init_property_list, property_name_to_ctype):
-	  ditto.
-
-Tue Nov  9 13:29:36 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* win32/win32.c (overlapped_socket_io): get rid of a warning of 64bit
-	  mingw.
-
-Tue Nov  9 10:44:19 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* util.c (ruby_strtod): this code uses FPU's rounding system.
-	  But x86's FPU calculates double precision floating-point
-	  numbers in 80bit precision, so it fails to round the value.
-	  So ensure the value is assigned a variable. [ruby-dev:42551]
-	  see also [ruby-math:00802]
-	  http://www.shudo.net/java-grandprix99/strictfp/
-
-Tue Nov  9 07:30:15 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* error.c (rb_syserr_new): new function to make SystemCallError
-	  instance without errno.  [EXPERIMENTAL]
-
-	* error.c (rb_syserr_fail, rb_mod_syserr_fail): ditto.
-
-Tue Nov  9 05:54:57 2010  Marc-Andre Lafortune  <ruby-core@marc-andre.ca>
-
-	* lib/*.rb: Remove unused variable warnings.
-	  Patch by Run Paint [ruby-core:30991]
-
-	* lib/rubygems/*, lib/rdoc/*.rb, lib/rake/*.rb: ditto
-
-Mon Nov  8 18:26:03 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* util.c (ruby_hdtoa): fix type cast and bufsize.
-
-Mon Nov  8 15:40:56 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* vsnprintf.c (BSD_vfprintf): fix precision specifier doesn't
-	  work well on %f. [ruby-dev:42552]
-
-Mon Nov  8 14:41:40 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* win32/win32.c (get_wsa_extension_function): typos.
-
-Mon Nov  8 13:41:33 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* tool/enc-unicode.rb,
-	  enc/unicode/name2ctype.h, enc/unicode/name2ctype.h.blt,
-	  enc/unicode/name2ctype.kwd, enc/unicode/name2ctype.src:
-	  Add Age property to regexp. [ruby-core:33019]
-	  patched by Ammar Ali, tested by Run Paint Run Run
-
-Mon Nov  8 12:16:39 2010  Ben Walton  <bwalton@artsci.utoronto.ca>
-
-	* configure.in: support -h for solaris linker when gcc not used
-
-Mon Nov  8 11:47:39 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* win32/win32.c (finish_overlapped_socket): refactoring.
-
-Mon Nov  8 11:02:21 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* win32/win32.c (get_proc_address): refactoring.
-
-	* win32/win32.c (get_wsa_exetinsion_function): refactoring.
-
-Mon Nov  8 09:45:35 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* enc/trans/gbk-tbl.rb: Add euro sign. [ruby-core:33094]
-	  CP936, which is de facto definition of GBK, has it.
-	  http://msdn.microsoft.com/en-us/goglobal/cc305153.aspx
-
-Mon Nov  8 07:26:20 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* configure.in: check only the first symbol to get rid of
-	  duplication.  [ruby-core:33084] #4031
-
-Sun Nov  7 10:13:30 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* configure.in (NM): check on all platforms.  #4031
-
-Sun Nov  7 06:16:33 2010  Aaron Patterson <aaron@tenderlovemaking.com>
-
-	* test/openssl/test_ocsp.rb: adding test for r29699.  Thanks Elise
-	  Huard! [ruby-core:32460]
-
-Sat Nov  6 07:33:08 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* configure.in (rb_cv_export_prefix): check for prefixed
-	  underscore of exported symbols
-
-	* tool/rbinstall.rb (bin-comm): prepend prolog shell script if
-	  necessary.
-
-	* configure.in (LIBRUBY_RELATIVE): use rpath token expansion.
-
-Sat Nov  6 07:24:01 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* template/ruby.pc.in (arch, sitearch): reordered.
-
-	* configure.in: keep failed file.
-
-Sat Nov  6 07:03:49 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* process.c (rb_fork_err): save errinfo before fdopen.
-
-Sat Nov  6 00:43:58 2010  Aaron Patterson <aaron@tenderlovemaking.com>
-
-	* ext/openssl/ossl_ocsp.c (ossl_ocspcid_initialize): an optional
-	  parameter may be used to specify the OpenSSL::OCSP::CertificateId on
-	  initialization.  Thanks Elise Huard! [ruby-core:32460]
-
-Fri Nov  5 12:23:01 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* test/ruby/test_{process,system}.rb (test_fallback_to_sh):
-	  meaningless and wrong tests where /bin/sh does not exist.
-
-	* process.c (proc_spawn_v): should spawn, not exec.
-
-Fri Nov  5 01:21:31 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* process.c (proc_exec_v, proc_spawn_v): try to execute with sh if
-	  no shebang.  [ruby-core:32745] [EXPERIMENTAL]
-
-Fri Nov  5 00:39:00 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* io.c (rb_io_readlines, rb_io_each_line): limit must not be zero.
-	  a patch from Tomoyuki Chikanaga at [ruby-dev:42538].  #4024
-
-Fri Nov  5 00:14:15 2010  Aaron Patterson <aaron@tenderlovemaking.com>
-
-	* ext/fiddle/extconf.rb: fixing ffi library location on windows.
-	  Thanks Usa! [ruby-core:32930]
-
-Thu Nov  4 20:04:44 2010  Koichi Sasada  <ko1@atdot.net>
-
-	* gc.c (rb_newobj): force garbage_collect() if GC.stress == true.
-
-Thu Nov  4 19:48:22 2010  Koichi Sasada  <ko1@atdot.net>
-
-	* ChangeLog: missed to write a last ChangeLog.
-
-	* gc.c (gc_finalize_deferred): removed.
-
-	* gc.c (rb_gc_finalize_deferred): Do not invoke a free_unused_heaps().
-
-Thu Nov  4 19:45:27 2010  Koichi Sasada  <ko1@atdot.net>
-
-	* gc.c (run_final): do not need argument obj.
-
-Thu Nov  4 19:26:10 2010  Koichi Sasada  <ko1@atdot.net>
-
-	* gc.c (before_gc_sweep): fix commit miss.
-
-Thu Nov  4 19:20:46 2010  Koichi Sasada  <ko1@atdot.net>
-
-	* gc.c (after_gc_sweep, before_gc_sweep):
-	  invoke rb_sweep_method_entry() as soon as possible.
-
-Thu Nov  4 19:13:58 2010  Koichi Sasada  <ko1@atdot.net>
-
-	* gc.c (after_gc_sweep, slot_sweep): finalizers should be invoked
-	  as soon as possible.
-
-Thu Nov  4 10:30:40 2010  URABE Shyouhei  <shyouhei@ruby-lang.org>
-
-	* configure.in (--with-valgrind): Now this option is default on.
-	  You can still explicitly disable this feature by specifying
-	  --without-valgrind.
-
-Thu Nov  4 02:06:16 2010  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* cont.c (fiber_t_alloc): raise an error when fiber is going to be
-	  initialized twice.  [ruby-dev:42524]
-
-Thu Nov  4 02:04:25 2010  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* cont.c (rb_fiber_resume): raise an "double resume" error when root
-	  fiber is going to be resumed.  [ruby-dev:42523]
-
-Wed Nov  3 14:17:18 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* lib/ostruct.rb (OpenStruct#delete_field): also undefine
-	  accessor methods.  [ruby-core:33010]
-
-Wed Nov  3 14:13:46 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* string.c (rb_enc_cr_str_buf_cat): concatenation of valid
-	  encoding string and invalid encoding string should result
-	  invalid encoding.  [ruby-core:33027]
-
-Wed Nov  3 08:58:59 2010  Koichi Sasada  <ko1@atdot.net>
-
-	* gc.c, vm.c, vm_core.h: remove USE_VALUE_CACHE option.
-
-Wed Nov  3 07:47:25 2010  Yukihiro Matsumoto  <matz@ruby-lang.org>
-
-	* lib/irb/ruby-lex.rb (RubyLex#identify_string): parse multiple
-	  regex options.  a patch from Heesob Park in [ruby-core:32988].
-
-Wed Nov  3 07:33:57 2010  Tanaka Akira  <akr@fsij.org>
-
-	* vm_method.c (rb_clear_cache_by_class): just return if the class has
-	  no method.  reported by Eric Wong.  [ruby-core:32689]
-
-Tue Nov  2 22:50:25 2010  Aaron Patterson <aaron@tenderlovemaking.com>
-
-	* ext/psych/lib/psych/visitors/visitor.rb (initialize): push accessor
-	  methods to subclass that actually uses them.
-
-Tue Nov  2 22:47:08 2010  Aaron Patterson <aaron@tenderlovemaking.com>
-
-	* ext/psych/lib/psych/visitors/visitor.rb (accept): switch to
-	  a dispatch cache rather than case / when statement.
-
-Tue Nov  2 21:46:52 2010  Kouhei Sutou  <kou@cozmixng.org>
-
-	* NEWS: fix a typo.
-
-Tue Nov  2 20:10:32 2010  Tajima Akio <artonx@yahoo.co.jp>
-
-	* test/rake/test_tasks.rb: clear env var which is used by the test.
-	  [ruby-dev:42508]
-
-Tue Nov  2 00:25:54 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* ext/socket/extconf.rb: win64 is just same with win32 about socket.
-	  notice: but wince is not same.
-
-Mon Nov  1 21:25:57 2010  URABE Shyouhei  <shyouhei@ruby-lang.org>
-
-	* main.c: <stdlib.h> is needed, to introduce the getenv(3)
-	  prototype declaration.  Without it a C compiler shall infer
-	  the getenv type as "int getenv(...);", but this is totally
-	  wrong, especially when your machine's sizeof(int) and
-	  sizeof(char*) differs.  On such environment a return value
-	  of getenv(3), which is in fact a char*, might first casted
-	  into a int (loses data here), and then casted back to char*
-	  by automatic integral promotion to fit to the prototype of
-	  ruby_set_debug_option().
-
-Sun Oct 31 23:27:09 2010  Koichi Sasada  <ko1@atdot.net>
-
-	* gc.c (finalizer_table, objspace->final.table):
-	  Create finalizer_table at Init_heap().
-	  Remove all null checks of finalizer_table.
-
-	* gc.c (mark_tbl): skip if no table entries.
-
-	* gc.c (slot_swee): remove useless need_call_final check.
-
-Sun Oct 31 22:32:08 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* gc.c (rb_objspace_free): finalizers should be called separately
-	  from freeing objspace.  [ruby-dev:42479]
-
-Sun Oct 31 22:24:14 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* eval.c (ruby_cleanup): free current VM and its objspace even
-	  when exiting by SystemExit.
-
-Sun Oct 31 22:10:56 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* compile.c (new_child_iseq): adjust argument types.
-
-	* iseq.c (prepare_iseq_build, rb_iseq_new),
-	  (rb_iseq_new_with_bopt_and_opt, rb_iseq_new_with_opt),
-	  (rb_iseq_new_with_bopt): ditto.
-
-	* compile.c (iseq_set_exception_table): suppress warnings.
-
-	* insns.def (putspecialobject, defined): ditto.
-
-	* iseq.c (iseq_load): ditto.
-
-Sun Oct 31 09:30:51 2010  Koichi Sasada  <ko1@atdot.net>
-
-	* vm_core.h: some refactoring.
-	  - move decl. of rb_compile_option_struct to iseq.h.
-	  - define enum iseq_type.
-	  - define enum vm_special_object_type.
-
-	* compile.c: some refactoring.
-	  - apply above changes.
-	  - (struct iseq_link_element): change value of type.
-	  - remove unused decl.
-	  - fix comment.
-	  - rename iseq_build_body and iseq_build_exception to
-	    iseq_build_from_ary_body and iseq_build_from_ary_exception.
-
-	* iseq.h: define enum catch_type and enum defined_type.
-
-	* insns.def: apply above changes.
-
-	* iseq.c: define ISEQ_MAJOR_VERSION and ISEQ_MINOR_VERSION.
-
-Sat Oct 30 23:38:59 2010  Kouhei Sutou  <kou@cozmixng.org>
-
-	* lib/rexml/encoding.rb: untabify.
-
-Sat Oct 30 21:06:37 2010  Kouhei Sutou  <kou@cozmixng.org>
-
-	* lib/rexml/encoding.rb: use Ruby native encoding mechanism.
-	  [ruby-dev:42464]
-	* lib/rexml/encodings/: remove.
-
-	* lib/rexml/document.rb, lib/rexml/formatters/default.rb,
-	  lib/rexml/output.rb, lib/rexml/parseexception.rb,
-	  lib/rexml/parsers/baseparser.rb, lib/rexml/source.rb,
-	  lib/rexml/xmldecl.rb: use Ruby's native Encoding object.
-
-	* test/rexml/, test/rss/: follow the above encoding changes.
-
-	* NEWS: add REXML's incompatible change about encoding.
-
-Sat Oct 30 17:23:19 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* util.c (ruby_strtod): get rid of overflow/underflow as possible.
-
-Sat Oct 30 14:37:39 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* configure.in (ruby_pc): erase runtime-defined variables and
-	  check if generated pc file is valid.
-
-	* template/ruby.pc.in (DEFFILE): need for mingw.
-
-	* template/ruby.pc.in (LIBRUBY): fix the order.
-
-Sat Oct 30 11:33:54 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* win32/Makefile.sub (ruby_pc): ignore missing variables.
-
-	* template/ruby.pc.in: add missing variables for mswin.
-
-Sat Oct 30 10:24:35 2010  Marc-Andre Lafortune  <ruby-core@marc-andre.ca>
-
-	* object.c: Make BasicObject.new accept no parameter.
-	  Revert of r26135 [ruby-core:27080], as per [ruby-core:32952].
-
-Sat Oct 30 09:40:54 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* enum.c: use constants in id.h.
-
-Sat Oct 30 09:08:27 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* ext/fiddle/closure.c (fiddle_closure): embed cif not reference
-	  so that the content surely get initialized.  [ruby-dev:42480]
-
-Sat Oct 30 07:01:53 2010  Tanaka Akira  <akr@fsij.org>
-
-	* lib/resolv-replace.rb: suppress warning.
-
-	* lib/open-uri.rb: ditto.
-
-Sat Oct 30 06:32:52 2010  Tanaka Akira  <akr@fsij.org>
-
-	* test/pathname/test_pathname.rb (TestPathname#test_grpowned?): the
-	  group of the created file is inherited from the parent
-	  directory on BSDs and MacOS X.  Linux also inherit the group if
-	  the setgid bit of the directory is set.  It causes the test fail.
-	  fixed by Shota Fukumori.  [ruby-dev:42458]
-
-Sat Oct 30 05:58:54 2010  Tanaka Akira  <akr@fsij.org>
-
-	* lib/resolv.rb: retry via TCP if UDP reply is truncated.
-	  fixed by Julian Mehnle.  [ruby-core:32407]
-
-Sat Oct 30 00:35:13 2010  Koichi Sasada  <ko1@atdot.net>
-
-	* iseq.c (iseq_s_compile): fix optional argument.
-	  a patch from Yutaka HARA [ruby-core:32953] [Ruby 1.9-Bug#4001]
-
-Sat Oct 30 00:24:42 2010  Koichi Sasada  <ko1@atdot.net>
-
-	* ext/objspace/objspace.c (memsize_of): take care of
-	  T_CLASS/const_tbl.
-	  a patch from nagachika <nagachika00@gmail.com> [ruby-dev:42490]
-
-Fri Oct 29 23:32:36 2010  Koichi Sasada  <ko1@atdot.net>
-
-	* test/profile_test_all.rb: added.
-	  You can use test-all profiler with the following command:
-	    RUBY_TEST_ALL_PROFILE=true make test-all
-	  This command generates ./test_all_profile and you can analyze
-	  which tests consume memories.
-
-	* test/runner.rb: ditto.
-
-Fri Oct 29 10:02:03 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* tool/enc-unicode.rb,
-	  enc/unicode/name2ctype.h, enc/unicode/name2ctype.h.blt,
-	  enc/unicode/name2ctype.kwd, enc/unicode/name2ctype.src:
-	  Add 'Unknown' Script.
-	  patched by Run Paint Run Run. [ruby-core:32937] #3998
-
-Fri Oct 29 05:13:34 2010  Koichi Sasada  <ko1@atdot.net>
-
-	* ext/objspace/objspace.c (ObjectSpace.memsize_of_all): rename
-	  ObjectSpace.total_memsize_of_all_objects() to
-	  ObjectSpace.memsize_of_all([klass]).
-	  Accept Class object to filter the objects.
-
-	* test/objspace/test_objspace.rb: fix test for above change.
-
-Fri Oct 29 03:04:16 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* string.c (rb_str_dump): fix expected length. [ruby-core:32935]
-
-Thu Oct 28 23:31:39 2010  Koichi Sasada  <ko1@atdot.net>
-
-	* gc.c (before_gc_sweep, run_final): fix decrement timing of final_num.
-
-Thu Oct 28 20:11:30 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* tool/enc-unicode.rb,
-	  enc/unicode/name2ctype.h, enc/unicode/name2ctype.h.blt,
-	  enc/unicode/name2ctype.kwd, enc/unicode/name2ctype.src:
-	  Update Oniguruma for Unicode 6.
-	  patched by Run Paint Run Run. [ruby-core:32923] #3989
-
-Thu Oct 28 20:06:25 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* include/ruby/oniguruma.h (ONIGENC_CTYPE_SPECIAL_MASK):
-	  change mask from 128 to 256. [ruby-core:32931]
-
-Thu Oct 28 12:06:54 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* lib/webrick/httprequest.rb (read_request_line): extend max
-	  length to 2083. This is from Internet Explorer's max uri
-	  length. http://support.microsoft.com/kb/208427 [ruby-core:32924]
-
-Thu Oct 28 04:00:08 2010  Koichi Sasada  <ko1@atdot.net>
-
-	* gc.c (GC.stat): added.  [ruby-dev:38607]
-
-	* test/ruby/test_gc.rb: add a test for above.
-
-Thu Oct 28 03:13:06 2010  Koichi Sasada  <ko1@atdot.net>
-
-	* ext/objspace/objspace.c (memsize_of): fix rdoc.
-
-	* ext/objspace/objspace.c (total_memsize_of_all_objects): added.
-
-	* test/objspace/test_objspace.rb:
-	  - add a test for ObjectSpace.total_memsize_of_all_objects.
-	  - add two tests for ObjectSpace.memsize_of (for nil and Fixnum).
-
-Wed Oct 27 23:55:27 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* ext/iconv/iconv.c (Init_iconv): warn deprecated use.
-
-Wed Oct 27 18:50:17 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* bignum.c (rb_big2long, rb_big2ulong): rb2ulong() returns VALUE, but
-	  its real range is ulong. So, if the size of VALUE is bigger than
-	  ulong, upper bits are always zero even if the actual value is
-	  negative.
-	  fixed #3490
-
-Wed Oct 27 18:27:17 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* test/ruby/test_io.rb (TestIO#pipe): should close write end of pipe
-	  before closing read end, to get rid of timing problem.
-
-	* test/ruby/test_io_m17n.rb (TestIO_M17N#pipe): ditto.
-
-Wed Oct 27 18:14:27 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* win32/win32.c (rb_w32_getppid): support Win64.
-
-Wed Oct 27 15:07:19 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* thread_win32.c (w32_error): should get error no only once, because
-	  the result of the second getting will indicate the error of the
-	  first FormatMessage() call.
-
-Wed Oct 27 13:51:25 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* test/ruby/test_io.rb (TestIO#pipe): need to propagate exceptions
-	  in read/write thread. fix r29541.
-
-	* test/ruby/test_io_m17n.rb (TestIO_M17N#pipe): ditto.
-
-Wed Oct 27 12:05:40 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* class.c (clone_const): need to return value. fix r29602.
-
-Wed Oct 27 11:58:58 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* include/ruby/ruby.h (NUM2LONG_internal): add cast to get rid of a
-	  non GCC compiler warning. this is intentional type conversion.
-
-Wed Oct 27 09:25:46 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* cont.c: apply documentation patch by Run Paint Run Run.
-	  [ruby-core:32915]
-
-Wed Oct 27 02:12:10 2010  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* object.c (Init_Object), constant.h, variable.c
-	  (rb_mod_private_constant, rb_mod_public_constant,
-	  set_const_visibility, rb_const_get_0): add Module#public_constant
-	  and private_constant.  [ruby-dev:39685][ruby-core:32698]
-
-	* test/ruby/test_module.rb: add tests for above.
-
-Wed Oct 27 02:02:54 2010  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* class.c, constant.h, gc.c, method.h, object.c, variable.c,
-	  vm_insnhelper.c: use struct rb_constant_entry_t as entry of
-	  RCLASS_CONST_TBL.  RCLASS_CONST_TBL has contained VALUE of constant
-	  directly.  Now instead rb_const_entry_t is contained in
-	  RCLASS_CONST_TBL,  rb_const_entry_t is managed by malloc, and
-	  have not only the value itself but also visibility flag.
-	  This is another preparation for private constant (see
-	  [ruby-dev:39685][ruby-core:32698]).
-
-Wed Oct 27 01:56:34 2010  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* class.c, gc.c, object.c, variable.c, vm_insnhelper.c,
-	  include/ruby/ruby.h: separate RCLASS_CONST_TBL from RCLASS_IV_TBL.
-	  RCLASS_IV_TBL has contained not only instance variable table but
-	  also constant table.  Now the two table are separated to
-	  RCLASS_CONST_TBL and RCLASS_IV_TBL.  This is a preparation for
-	  private constant (see [ruby-dev:39685][ruby-core:32698]).
-
-Tue Oct 26 18:51:00 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* lib/scanf.rb (extract_float): allow 2.e+2 style.
-	  [ruby-dev:42452] #3978
-
-Tue Oct 26 18:09:36 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* Makefile.in (ASFLAGS): needs INCFLAGS.
-
-	* configure.in (rb_cv_dynamic_alloca): check if extra source for
-	  dynamic size alloca.
-
-	* missing/x86_64-chkstk.s (___chkstk): necessary for alloca of
-	  amd64-mingw32msvc-gcc on Ubuntu.
-
-	* thread_win32.c (ruby_alloca_chkstk): check stack overflow
-
-Tue Oct 26 18:04:53 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* template/ruby.pc.in (Libs): needs DLDFLAGS.
-
-Tue Oct 26 12:47:10 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* common.mk (pkgconfig-data): moved from Makefile.in.
-
-	* tool/rbinstall.rb: install pc file only if non-empty.
-	  [ruby-core:32901] #3983
-
-	* win32/Makefile.sub (ruby_pc): create pc file.
-
-Tue Oct 26 09:13:34 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* configure.in (rb_cv_gcc_atomic_builtins): check for atomic
-	  builtins, all are not available in Apple derivative gcc.
-
-Tue Oct 26 00:29:26 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* Makefile.in (pkgconfig-data): create pkg-config metadata file.
-
-	* tool/rbinstall.rb: install pkg-config metadata file.
-
-	* template/ruby.pc.in: template of pkg-config metadata file.
-
-Mon Oct 25 16:38:07 2010  URABE Shyouhei  <shyouhei@ruby-lang.org>
-
-	* signal.c  (rb_atomic_t): GCC (of  at least  recent versions)
-	  has  ubiquitous  support  for  atomic operations.   On  that
-	  compiler a C program can  issue a memory barrier using these
-	  dedicated  instructions.  According to  the GCC  manual they
-	  cargo culted  this feature form  the Itanium ABI  so chances
-	  are that  other compilers  could also support  this feature.
-	  But so far GCC is the  only compiler that I know to have it.
-	  Also note that this works on non-Itanium machines.
-
-Mon Oct 25 06:21:35 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* vsnprintf.c (BSD_vfprintf): prec digits fractal part should be
-	  appended to 0 if prec is given.  [ruby-dev:42453] #3979
-
-Mon Oct 25 02:57:21 2010  Koichi Sasada  <ko1@atdot.net>
-
-	* common.mk (run.gdb): Quit gdb on 'make gdb' when
-	  no signals are received.
-
-Mon Oct 25 00:25:23 2010  Tadayoshi Funaba  <tadf@dotrb.org>
-
-	* lib/date.rb: some corrections of documentation.
-
-Sun Oct 24 17:14:00 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* array.c, gc.c, hash.c, object.c, string.c, struct.c,
-	  transcode.c, variable.c, vm.c, vm_insnhelper.c, vm_method.c:
-	  replace calls to rb_error_frozen() with rb_check_frozen().  a
-	  patch from Run Paint Run Run at [ruby-core:32014]
-
-	* include/ruby/intern.h (rb_check_frozen): optimize.
-	  [ruby-core:32878]
-
-Sun Oct 24 15:16:30 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* lib/test/unit.rb (Test::Unit::Mini#run): abort if interrupted.
-
-	* lib/test/unit.rb (Test::Unit::Mini#run_test_suites): show the
-	  result even when interrupted on the way.
-
-	* lib/test/unit.rb (Test::Unit::Mini#run_test_suites): ensure
-	  output sync mode to be restored.
-
-Sun Oct 24 14:11:16 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* vm.c (vm_define_method): defined method is run with the default
-	  public visibility regardless the visibility context of definition.
-	  [ruby-core:30638]
-
-Sun Oct 24 12:08:54 2010  Aaron Patterson <aaron@tenderlovemaking.com>
-
-	* lib/test/unit.rb: make test/unit play nicely with the rake test
-	  loader. [ruby-core:32864]
-
-Sun Oct 24 00:25:13 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* test/ruby/test_rubyoptions.rb (test_segv_test): follow up the
-	  change at r29556.
-
-Sat Oct 23 14:39:58 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* lib/mkmf.rb: $extmk should be true for test/runner.
-
-Sat Oct 23 10:55:37 2010  Koichi Sasada  <ko1@atdot.net>
-
-	* vm_dump.c (rb_vm_bugreport): fix to add bug outputs.
-	  - loaded script ($0)
-	  - loaded features ($")
-	  - process memory map on Linux (/proc/self/maps)
-
-	* vm_dump.c (rb_vmdebug_stack_dump_raw): fix header message.
-
-Fri Oct 22 14:50:13 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* lib/test/unit/assertions.rb (Test::Unit::Assertions#assert):
-	  assertion message must not be nil.
-
-Fri Oct 22 13:59:50 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* lib/test/unit/assertions.rb (Test::Unit::Assertions#assert):
-	  treat nil case. Please run test-all before commit such change.
-
-Thu Oct 21 23:58:14 2010  Koichi Sasada  <ko1@atdot.net>
-
-	* gc.c (gc_lazy_sweep): Variable declarations should be at
-	  the head of block.
-
-Thu Oct 21 23:56:54 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* gc.c (objspace_each_objects, rb_objspace_each_objects): use
-	  struct.
-
-	* gc.c (objspace_each_objects): fix return with no value.
-
-Thu Oct 21 23:47:12 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* dir.c (dir_initialize): remove useless intermediate variable.
-
-Thu Oct 21 16:07:20 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* io.c (rb_f_select): change rdoc.
-	  patched by Eito Katagiri [ruby-core:31805]
-
-Thu Oct 21 15:55:21 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* lib/webrick/httpauth/digestauth.rb
-	  (WEBrick::HTTPAuth::ProxyDigestAuth#check_uri): privated.
-	  [ruby-dev:42344]
-
-Thu Oct 21 15:50:25 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* io.c (rb_f_select): add correct rdoc.
-	  patched by Dave Thomas [ruby-core:32467]
-
-Thu Oct 21 15:42:01 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* lib/net/telnet.rb (Net::Telnet#close): added.
-	  patched by Erik Hollensbe [ruby-dev:42260] #3830
-
-Thu Oct 21 13:08:00 2010  Narihiro Nakamura  <authornari@gmail.com>
-
-	* gc.c (rb_objspace_each_objects): don't lazy sweep in
-	  rb_objspace_each_objects. [Bug #3940] [ruby-dev:42369]
-
-Thu Oct 21 00:05:45 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* test/ruby/test_io.rb (TestIO#pipe): get rid of deadlock on pipe.
-	  a patch from Tomoyuki Chikanaga at [ruby-dev:42435].  #3970
-
-	* test/ruby/test_io_m17n.rb (TestIO_M17N#pipe): ditto.
-
-Wed Oct 20 23:54:36 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* ext/dbm/dbm.c: rdoc based on a patch by mathew meta AT
-	  pobox.com, at [ruby-core:32853].
-
-Wed Oct 20 10:47:21 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* util.c (ruby_strtod): reject 0x1.p+0. [ruby-dev:42432] #3966
-
-Wed Oct 20 10:00:57 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* vsnprintf.c (BSD_vfprintf): print floating point on "%#a".
-	  [ruby-dev:42431] Bug#3965
-
-Tue Oct 19 19:30:11 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* vsnprintf.c (BSD_vfprintf): clear ALT flag for %a.
-	  [ruby-core:32841] [ruby-core:32848]
-
-Tue Oct 19 12:19:25 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* vsnprintf.c (BSD_vfprintf): fix over-count of field size.
-
-Tue Oct 19 03:08:52 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* vsnprintf.c (BSD_vfprintf): use HEXPREFIX flag for prefix of %a.
-	  [ruby-core:32841]
-
-Mon Oct 18 13:18:01 2010  Akinori MUSHA  <knu@iDaemons.org>
-
-	* ext/digest/digest.c (rb_digest_class_init): Define
-	  Digest::Class.new(). [Feature #3954]
-
-Mon Oct 18 12:58:40 2010  Tanaka Akira  <akr@fsij.org>
-
-	* pack.c (pack_pack): refine the document.  [ruby-dev:42397]
-	  (pack_unpack): ditto.
-
-Mon Oct 18 10:19:00 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* lib/net/http.rb (transport_request): @socket may be nil.
-	  patched by Egbert Eich [ruby-core:32829]
-
-Mon Oct 18 09:57:28 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* sprintf.c (BSD_vfprintf): wrong padding around prefix and
-	  floating point with %a. [ruby-dev:42403] Bug #3956
-
-Sun Oct 17 22:36:33 2010  Tadayoshi Funaba  <tadf@dotrb.org>
-
-	* lib/date/delta.rb: added an rdoc tag.
-
-Sun Oct 17 10:47:12 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* variable.c (rb_mod_remove_const): update rdoc.
-	  [ruby-core:31957]
-
-Sun Oct 17 10:40:17 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* class.c (rb_define_{class,module}_id_under): register to be
-	  marked, which probably are defined and used internally.
-
-Sat Oct 16 11:10:55 2010  Masaki Suketa <masaki.suketa@nifty.ne.jp>
-
-	* ext/win32ole/win32ole.c (ole_encoding2cp): set codepage 20936
-	  according to GB2312. [Bug #3937] [ruby-core:32758]
-
-Sat Oct 16 10:54:57 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* Makefile.in (CPP): already used in .c.i rule.
-
-	* cygwin/GNUmakefile.in (DLLWRAP, WINDRES): add --driver-name and
-	  --preprocessor options explicitly.  [ruby-core:32776]
-
-Sat Oct 16 10:06:08 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* ext/sdbm/_sdbm.c (SEEDUPS, BADMESS): make settable using command
-	  line options.
-
-	* ext/sdbm/_sdbm.c (makroom): suppress unused result warning.
-
-	* ext/sdbm/extconf.rb: disable BADMESS, a library should not emit
-	  messages directly.
-
-Sat Oct 16 08:39:03 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* dln.c (dln_strerror): get English message first, instead of
-	  system default. see [ruby-dev:42358].
-
-Sat Oct 16 00:08:00 2010  Koichi Sasada  <ko1@atdot.net>
-
-	* hash.c (rb_hash_aref): skip calling "default" method
-	  if it is not needed, for speed-up.
-
-Fri Oct 15 23:36:25 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* file.c (NUM2DEVT, DEVT2NUM, PRI_DEVT_PREFIX): fallback to
-	  unsigned int.
-
-Fri Oct 15 22:54:46 2010  Masaki Suketa <masaki.suketa@nifty.ne.jp>
-
-	* ext/win32ole/win32ole.c (ole_hresult2msg): get English message first,
-	  instead of system default. [ruby-core:32765]
-
-Fri Oct 15 22:47:31 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* include/ruby/ruby.h (VALUE): prefer long over uintptr_t,
-	  FIX2LONG expects VALUE to be long at least.
-
-	* include/ruby/ruby.h (FIX2LONG): parenthesize the argument.
-
-Fri Oct 15 20:30:30 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* configure.in (dev_t): use RUBY_REPLACE_TYPE.
-
-	* file.c (rb_stat_inspect): use PRI_DEVT_PREFIX.
-
-Fri Oct 15 17:26:57 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* pack.c (pack_pack): simplify comparison of explicit_endian
-	  as pointed by nobu.
-
-	* pack.c (pack_unpack): ditto.
-
-Fri Oct 15 16:40:37 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* pack.c (pack_pack): fix more than one modifiers appear in the
-	  format string. [ruby-core:32793]
-
-	* pack.c (pack_unpack): ditto.
-
-Thu Oct 14 23:20:42 2010  Masaki Suketa <masaki.suketa@nifty.ne.jp>
-
-	* test/win32ole/test_folderitem2_invokeverb.rb: refactoring.
-
-Thu Oct 14 22:18:29 2010  Koichi Sasada  <ko1@atdot.net>
-
-	* insns.def, iseq.c, vm_insnhelper.c: rename variable name
-	  (ip -> iseq).
-
-Thu Oct 14 20:41:27 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* pack.c (pack_pack): support endian modifiers: < and >.
-	  [ruby-dev:42376] Feature #3491
-
-	* pack.c (pack_unpack): ditto.
-
-Thu Oct 14 20:50:51 2010  Masaki Suketa <masaki.suketa@nifty.ne.jp>
-
-	* ext/win32ole/win32ole.c (reg_get_val): expand environment in
-	  the pathname. [Bug #3907]
-
-Thu Oct 14 07:35:07 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* file.c (DEVT2NUM): added. Size of dev_t is depend on the
-	  environment even if POSIX defines dev_t as unsigned integer.
-	  For example, OpenVMS, 64bit Solaris 9, and NetBSD 6 defines
-	  dev_t as 64bit unsigned integer.
-
-	* file.c (rb_stat_dev): use DEVT2NUM.
-
-	* file.c (rb_stat_dev_major): dev_t is not long. major(3)'s return
-	  value is int.
-
-	* file.c (rb_stat_dev_minor): dev_t is not long. minor(3)'s return
-	  value is int.
-
-	* configure.in: check size of dev_t.
-
-Thu Oct 14 07:22:12 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* array.c (rb_ary_and, rb_ary_or), class.c (rb_mod_init_copy),
-	  gc.c (undefine_final), time.c (time_mload): get rid of
-	  type-punning casts.
-
-Thu Oct 14 04:16:41 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* numeric.c (ruby_float_step): fix Numeric#step with infinity unit
-	  doesn't works well. [ruby-core:32779]
-
-Wed Oct 13 23:16:46 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* tool/enc-unicode.rb: get rid of lots of warnings.
-
-	* iseq.c (insn_operand_intern, rb_iseq_disasm): fix format specifiers.
-
-	* vm.c (thread_free): ditto.
-
-	* numeric.c (check_uint): get rid of overflow on LLP64 platforms.
-
-	* insns.def (opt_case_dispatch): use st_data_t.
-
-Wed Oct 13 22:32:34 2010  Takeyuki FUJIOKA  <xibbar@ruby-lang.org>
-
-	* lib/cgi/util.rb (CGI::unescape): bugfix to unescape the multibyte
-	  string. Thanks nobu and tDiary dev members. [Bug #3909]
-
-Wed Oct 13 21:13:00 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* numeric.c (int_chr): raise error when the value is negative.
-
-Wed Oct 13 19:24:08 2010  URABE Shyouhei  <shyouhei@ruby-lang.org>
-
-	* vm.c (ruby_vm_destruct): This function type was wrong; correct to the prototype.
-
-Wed Oct 13 14:58:09 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* numeric.c (rb_num_to_uint): fix 32bit logic.
-
-Wed Oct 13 12:53:43 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* numeric.c (rb_num_to_uint): added to check the range of arguments.
-	  Mainly for negative value with NUM2UINT on 32bit environment.
-
-	* string.c (rb_str_concat): use rb_num_to_uint.
-
-Wed Oct 13 12:10:02 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* thread_win32.c (w32_error): get English message first, instead
-	  of system default. see [ruby-core:32765].
-	  [experimental]
-
-Wed Oct 13 11:04:03 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* debug.c (ruby_set_debug_option): define always for binary
-	  compatibility with debug env enabled binary.
-
-	* signal.c (ruby_enable_coredump): ditto.
-
-Wed Oct 13 10:52:51 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* include/ruby/ruby.h (ruby_executable_node): missing prototype.
-
-Wed Oct 13 05:23:04 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* missing/strchr.c: add strlen's prototype.
-
-	* missing/strstr.c: ditto.
-
-Wed Oct 13 00:21:17 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* ext/syck/rubyext.c (struct mktime_arg): constified.
-
-	* ext/syck/rubyext.c (mktime_do, mktime_r, rb_syck_mktime): fix
-	  function signatures.
-
-Wed Oct 13 00:18:18 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* st.c (MurmurMagic): get rid of literal overflow.
-
-	* configure.in (RUBY_CHECK_PRINTF_PREFIX): check for printf format
-	  specifier if possible.
-
-Tue Oct 12 23:58:19 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* win32/win32.c (rb_w32_open_osfhandle, rb_w32_wopen, rb_w32_pipe):
-	  use uintptr_t instead of long for win64.
-
-	* win32/win32.c (socketpair_internal): suppress warnings.
-
-	* win32/win32.c (ftruncate): use HANDLE instead of long for win64.
-
-	* vsnprintf.c (BSD_vfprintf): fix cast.
-
-	* numeric.c (rb_num2fix): result of rb_num2long is SIGNED_VALUE.
-
-	* compile.c (iseq_build_body), error.c (set_syserr, get_syserr),
-	  (syserr_initialize), gc.c (define_final, rb_gc_copy_finalizer),
-	  (run_final), hash.c (rb_hash_aref, rb_hash_lookup2),
-	  (rb_hash_fetch_m, rb_hash_clear, rb_hash_aset, eql_i),
-	  iseq.c (iseq_load, iseq_data_to_ary), marshal.c (r_symlink),
-	  thread.c (rb_thread_local_aref),
-	  variable.c (generic_ivar_remove, ivar_get, rb_const_get_0),
-	  (rb_cvar_get), vm.c (rb_vm_check_redefinition_opt_method),
-	  vm_insnhelper.c (vm_get_ev_const), vm_method.c (remove_method),
-	  ext/iconv/iconv.c (map_charset): use st_data_t.
-
-	* compile.c (iseq_build_body), insns.def (getglobal, setglobal),
-	  iseq.c (iseq_load, iseq_data_to_ary), util.c (valid_filename):
-	  use VALUE.
-
-	* gc.c (obj_free, rb_objspace_call_finalizer): fix truncating
-	  cast.
-
-	* gc.c (mark_current_machine_context): suppress warnings.
-
-	* compile.c (iseq_compile_each): fix truncating cast.
-
-	* cont.c (fiber_setcontext): missing variable definition.
-
-Tue Oct 12 19:25:13 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* error.c (exc_to_s): use OBJ_INFECT.
-
-	* error.c (name_err_to_s): ditto.
-
-	* error.c (name_err_mesg_to_str): ditto.
-
-	* error.c (syserr_initialize): ditto.
-
-Tue Oct 12 19:07:55 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* error.c (syserr_initialize): taint message if mesg is given
-	  and it is tainted.
-
-Tue Oct 12 18:25:43 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* io.c (rb_io_ungetc): always see Bignum. On 32bit valid value
-	  may be a Bignum. On 64bit for errors. [ruby-dev:42366]
-
-Tue Oct 12 18:25:04 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* string.c (rb_str_concat): use unsigned int for GB18030.
-
-Tue Oct 12 17:53:49 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* numeric (check_uint): the mask must refer to VALUE.
-
-Tue Oct 12 17:47:10 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* numeric (check_uint): set MSB for negative value.
-
-	* numeric (rb_num2uint): return value's type of rb_num2ulong
-	  is VALUE.
-
-	* numeric (int_chr): variable i can't be negative.
-
-Tue Oct 12 16:04:37 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* win32/win32.c (rb_w32_strerror): get English message first, instead
-	  of system default. see [ruby-dev:42358].
-	  [experimental]
-
-Tue Oct 12 15:52:35 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* win32/win32.c (rb_w32_strerror): unmap some range of errno for
-	  workaround of VC10's strerror() and sys_nerr problem.
-	  based on a patch from Akio Tajima, [ruby-dev:42355].
-
-Tue Oct 12 15:36:09 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* io.c (rb_io_ungetc): use unsigned int for GB18030.
-
-Tue Oct 12 15:14:21 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* io.c (rb_io_putc): support multibyte characters.
-	  [ruby-core:30697]
-
-Tue Oct 12 15:10:31 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* numeric.c (rb_enc_uint_chr): split from int_chr.
-
-	* numeric.c (int_chr): use rb_enc_uint_chr.
-
-	* include/ruby/encoding.h (rb_enc_uint_chr): added.
-
-Tue Oct 12 14:04:41 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* numeric.c (int_chr): a codepoint of Ruby M17N must be 32bit
-	  unsigned int; GB18030 uses MSB. Also note that OnigCodePoint
-	  is defined as unsigned int.
-
-Tue Oct 12 12:20:54 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* vm_dump.c (dump_thread): foolish mistake.
-
-Tue Oct 12 10:39:08 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* configure.in (RUBY_MINGW32): canonicalize only on mingw.
-
-Mon Oct 11 20:20:23 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* lib/net/http.rb (HTTP.get): specify ASCII-8BIT as the result
-	  encoding of Zlib::GzipReader.
-	  http://hibari.2ch.net/test/read.cgi/tech/1281473294/271
-
-Mon Oct 11 17:42:54 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* error.c (syserr_initialize): use mesg's encoding when locale
-	  encoding is US-ASCII. If locale encoding is not US-ASCII,
-	  assume err has non ASCII characters. [ruby-dev:42358]
-
-Mon Oct 11 14:03:54 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* error.c (syserr_initialize): set the encoding of Errno::*#message
-	  as locale. [ruby-dev:42358]
-
-Mon Oct 11 06:38:27 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* ext/stringio/stringio.c (strio_set_encoding):
-	  StringIO#set_encoding can get 2nd argument and optional hash
-	  for API compatibility to IO. [ruby-dev:42356]
-
-Mon Oct 11 06:11:30 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* io.c (rb_io_set_encoding): use rb_funcall2 when the io is not
-	  a T_FILE. [ruby-dev:42356]
-
-Sun Oct 10 18:42:23 2010  Akinori MUSHA  <knu@iDaemons.org>
-
-	* lib/set.rb (Set#replace): Apply a bit of optimization.
-
-Sun Oct 10 10:20:07 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* configure.in (RUBY_MINGW32): canonicalize as like mswin version.
-
-Sun Oct 10 05:33:14 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* vm_core.h (rb_signal_buff_size, rb_signal_exec): moved
-	  declarations from thread.c.
-
-Sat Oct  9 16:54:28 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* configure.in (RSHIFT): quote to get rid of argument expansion
-	  for autoconf 2.68.
-
-Sat Oct  9 11:00:06 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* thread.c (thread_reset_event_flags, exec_event_hooks): ignore
-	  hooks marked as removed.
-
-	* thread.c (thread_exec_event_hooks): remove hooks to be removed.
-
-	* thread.c (rb_threadptr_remove_event_hook, rb_remove_event_hook):
-	  defer removing hooks if running the hooks.  [ruby-dev:42350]
-
-Sat Oct  9 10:51:00 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* thread.c (rb_threadptr_exec_event_hooks): suppress each event
-	  hooks separately.
-
-	* thread.c (thread_suppress_tracing): split from
-	  ruby_suppress_tracing, accepting thread pointer and event mask.
-
-Sat Oct  9 08:16:01 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* thread.c (rb_threadptr_remove_event_hook): fix typo.
-
-Fri Oct  8 10:52:25 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* common.mk (RBCONFIG): depends on version.h due to
-	  RUBY_PATCHLEVEL.  [ruby-core:32709]
-
-Fri Oct  8 00:24:54 2010  James Edward Gray II  <jeg2@ruby-lang.org>
-
-	* lib/csv.rb: Fixing documentation typos.  [ruby-core:32712]
-
-Thu Oct  7 09:14:28 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* vm_exec.c (vm_exec_core):  Treat clang as non gcc on this
-	  context: It has __asm__ but doesn't works well.
-
-Wed Oct  6 12:28:22 2010  Tanaka Akira  <akr@fsij.org>
-
-	* lib/uri/generic.rb (URI::Generic#hostname): new method.
-	  (URI::Generic#hostname=): ditto.
-
-	* lib/open-uri.rb: use URI#hostname
-
-	* lib/net/http.rb: ditto.
-
-	  reported by Adam Majer.  [ruby-core:32056]
-
-Wed Oct  6 11:52:12 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* io.c (fptr_finalize): write_mutex might have been destroyed
-	  already in finalization phase, as the order of finalizers is not
-	  guaranteed.  rb_mutex_t should be used in place of Mutex object
-	  in the future.
-
-Tue Oct  5 22:17:02 2010  wanabe  <s.wanabe@gmail.com>
-
-	* win32/mkexports.rb: revert r29320 and r29402.
-
-Mon Oct  4 12:43:47 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* parse.y (regexp): dregexp has literal string only at the head
-	  and successors are array.  [ruby-core:32682]
-
-Mon Oct  4 10:22:21 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* random.c (rand_init): This checks the value is in 32bit or not,
-	  so use int32_t, not int.
-
-Mon Oct  4 09:47:39 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* random.c (rand_init): remove useless assignment.
-
-	* re.c (update_char_offset): remove unused variable.
-
-	* re.c (read_escaped_byte): ditto.
-
-Mon Oct  4 09:30:42 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* ext/openssl/lib/openssl/bn.rb (Integer#to_bn): OpenSSL::BN.new
-	  accepts only Strings, so call Integer#to_s(16).
-	  16 is for an optimization. [ruby-dev:42336]
-
-Mon Oct  4 07:57:51 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* cont.c (fiber_memsize): Return size.
-	  Before this change, fiber_memsize always returns 0.
-
-Mon Oct  4 07:16:55 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* enc/unicode.c (onigenc_unicode_property_name_to_ctype):
-	  remove useless assignment.
-
-	* vm.c (vm_make_proc_from_block): ditto.
-
-	* variable.c (rb_ivar_count): ditto.
-
-Mon Oct  4 06:40:24 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* Makefile.in (clean-rdoc): Don't use \ in variable expansion.
-	  BSD make treats it as an escape character.
-
-Mon Oct  4 00:01:53 2010  wanabe  <s.wanabe@gmail.com>
-
-	* tool/config.sub: revert r29320, r29324, r29347, r29354, r29365
-	  to automake-1.11.1. [ruby-core:32634]
-
-	* win32/mkexports.rb: no longer use 'mingw64'. a patch from Luis Lavena
-	  at [ruby-core:32678].
-
-Sun Oct  3 20:36:37 2010  Akio Tajima (arton)  <artonx@yahoo.co.jp>
-
-	* test/win32ole/test_folderitem2_invokeverb.rb: Change creating
-	  shortcut verb to 'Link' [Bug #3339]
-
-Sun Oct  3 19:44:23 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* configure.in (Makefile): get rid of duplicated ruby target when
-	  already there it was.
-
-Sat Oct  2 22:59:32 2010  Masaki Suketa <masaki.suketa@nifty.ne.jp>
-
-	* test/win32ole/test_thread.rb: add for win32ole with Thread.
-
-Fri Oct  1 17:03:00 2010  URABE Shyouhei  <shyouhei@ruby-lang.org>
-
-	* test/webrick/test_httpproxy.rb (TestWEBrickHTTPProxy::test_upstream_proxy):
-	  My machine fails this test at this line, saying 503 service unavailable.
-
-Thu Sep 30 16:11:08 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* win32/win32.c (rb_w32_getenv): should return NULL if specified name
-	  is empty. a patch from Heesob Park at [ruby-core:32650]
-
-Thu Sep 30 15:18:23 2010  Yukihiro Matsumoto  <matz@ruby-lang.org>
-
-	* parse.y (command_asgn): allow command_call to be right hand side
-	  expression of chained assignment.  [ruby-dev:42313]
-
-Thu Sep 30 10:55:38 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* hash.c (ruby_setenv): workaround for old Windows. a patch from
-	  Heesob Park. [ruby-core:32353]
-
-Thu Sep 30 09:29:06 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* lib/uri/common.rb (URI.encode_www_form): change treatment of
-	  undefined value in given array as latest internet draft for
-	  application/www-form-urlencoded.
-	  http://tools.ietf.org/html/draft-hoehrmann-urlencoded-01
-
-Thu Sep 30 09:34:03 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* vm_dump.c (dump_thread): fixed wrong type of return value of
-	  SymGetModuleBase64(). [ruby-dev:42306]
-
-Wed Sep 29 21:04:05 2010  URABE Shyouhei  <shyouhei@ruby-lang.org>
-
-	* test/ruby/test_rubyoptions.rb (TestRubyOptions::test_script_from_stdin):
-	  As usual, PTY is not always available.
-
-Wed Sep 29 18:38:14 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* tool/config.sub (x64): regularize only for pc vendor, and strip
-	  useless 64 suffix.
-
-Wed Sep 29 17:53:02 2010  Kenta Murata <mrkn@mrkn.jp>
-
-	* ext/bigdecimal/bigdecimal.c (BIGDECIMAL_ENABLE_VPRINT):
-	  VPrint is usually disabled.  It's only used in debugging.
-
-Wed Sep 29 17:41:34 2010  Kenta Murata <mrkn@mrkn.jp>
-
-	* ext/bigdecimal/bigdecimal.c (BigDecimal_save_limit):
-	  return the result of a block.
-
-	* test/bigdecimal/test_bigdecimal.rb (test_save_limit):
-	  add a test for the above change.
-
-Wed Sep 29 16:18:03 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* vm_dump.c (dump_thread): remove unused optional arguments.
-
-Wed Sep 29 13:26:30 2010  Kenta Murata <mrkn@mrkn.jp>
-
-	* ext/bigdecimal/bigdecimal.c (BigDecimal_save_rounding_mode):
-	  return the result of a block.
-
-	* test/bigdecimal/test_bigdecimal.rb (test_save_rounding_mode):
-	  add a test for the above change.
-
-	* test/bigdecimal/test_bigdecimal.rb (test_save_exception_mode):
-	  add a test for the return value of BigDecimal.save_exception_mode.
-
-Wed Sep 29 12:45:30 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* ext/bigdecimal/bigdecimal.c (BigDecimal_div2, BigDecimal_add2,
-	  BigDecimal_sub2, BigDecimal_mult2, VpLimitRound): remove meaningless
-	  casts to get rid of compiler warnings.
-
-Wed Sep 29 12:35:13 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* ext/bigdecimal/bigdecimal.c (VPrint, VpToString): fix format.
-
-Wed Sep 29 12:31:12 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* lib/rdoc/known_classes.rb (RDoc::KNOWN_CLASSES): add Encoding.
-
-Tue Sep 28 20:50:23 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* tool/config.sub (x64): regularize same as mswin.
-
-Tue Sep 28 20:06:14 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* vm_dump.c (rb_vm_bugreport): add windows support.
-	  based on patches from Peter Weldon at [ruby-core:32551]
-
-Mon Sep 27 23:30:34 2010  Koichi Sasada  <ko1@atdot.net>
-
-	* insns.def (opt_case_dispatch), vm_insnhelper.c:
-	  execute the procedures of "when" clauses by bytecode
-	  instead of st_foreach() when the object does not hit
-	  prepared hash.  [ruby-dev:42304]
-
-Mon Sep 27 15:54:03 2010  URABE Shyouhei  <shyouhei@ruby-lang.org>
-
-	* test/net/http/test_https.rb: As always, localhost is not
-	  guaranteed to be resolved as 127.0.0.1.  But a SSL
-	  certificate needs a socket to listen on a specific address
-	  where a CN resolves to.  On situations where localhost is
-	  not 127.0.0.1, these tests are not possible.
-
-Mon Sep 27 15:25:05 2010  URABE Shyouhei  <shyouhei@ruby-lang.org>
-
-	* test/net/imap/test_imap.rb: resurrection of r29259.
-	  this change depends on minitest 1.7.1.
-
-	* lib/test/unit/assertions.rb: ditto.
-
-Sun Sep 26 22:59:45 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* tool/config.sub (x86_64-pc-mingw64): regularize.
-
-Sun Sep 26 22:21:07 2010  wanabe  <s.wanabe@gmail.com>
-
-	* ext/openssl/ossl_hmac.c (ossl_hmac_hexdigest, ossl_hmac_s_hexdigest),
-	  ext/openssl/ossl_pkey_ec.c (ossl_ec_group_set_seed),
-	  ext/openssl/ossl_ssl_session.c (ossl_ssl_session_to_der),
-	  ext/openssl/ossl_pkcs7.c (numberof): suppress warnings.
-	  [ruby-core:31932]
-
-Sun Sep 26 10:25:24 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* tool/config.{guess,sub}: updated to automake-1.11.1.
-
-Sat Sep 25 22:48:30 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* configure.in (LIBRUBY_DLDFLAGS): fix quoting.
-
-Sat Sep 25 10:30:37 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* configure.in (LIBRUBY_DLDFLAGS): use -unexported_symbol only
-	  when available.  http://trac.macports.org/ticket/26341
-
-Sat Sep 25 10:05:49 2010  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* configure.in: Always add -mieee for Renesas SH4.
-	  Thanks, Nobuhiro Iwamatsu. [Feature #3874] [ruby-core:32548]
-
-Sat Sep 25 01:34:41 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* Makefile.in (install-cross): target to install cross-compiling
-	  stuff.
-
-Fri Sep 24 23:44:59 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* string.c (sym_call), vm.c (invoke_block_from_c),
-	  vm_insnhelper.c (vm_yield_with_cfunc): pass given block.
-	  [ruby-core:32075]
-
-	* vm_eval.c (rb_funcall_passing_block): new function to call
-	  method with passing given block.
-
-Fri Sep 24 15:50:43 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* string.c (rb_str_to_i): fix rdoc: String#to_i raises an
-	  exception when base is invalid. [ruby-core:31685]
-
-Fri Sep 24 15:28:35 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* string.c (rb_str_rindex): use rb_enc_prev_char instead of repeated
-	  str_nth.
-	  patched by Michael Selig [ruby-core:32498]
-
-Fri Sep 24 14:19:12 2010  URABE Shyouhei  <shyouhei@ruby-lang.org>
-
-	* test/test_pty.rb: Same as 229281; existence of PTY class do not
-	  guarantee a successful pty operation.
-
-Fri Sep 24 06:25:55 2010  Ryan Davis  <ryand-ruby@zenspider.com>
-
-	* lib/minitest/*.rb: Imported minitest 1.7.2 r5879.
-	* test/minitest/*.rb: ditto.
-
-Thu Sep 23 23:09:08 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* vm_insnhelper.c (vm_get_cref0): cref is stacked only in normal
-	  iseqs, so check if it is the case first.
-
-Thu Sep 23 23:08:41 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* tool/config.sub: mingw64 should use x86_64.  [ruby-core:32514]
-
-Thu Sep 23 21:40:40 2010  wanabe  <s.wanabe@gmail.com>
-
-	* ext/socket/raddrinfo.c (init_addrinfo, inspect_sockaddr): suppress
-	  warnings.  see [ruby-core:31932].
-
-Thu Sep 23 19:27:57 2010  wanabe  <s.wanabe@gmail.com>
-
-	* thread_win32.c (w32_wait_events, w32_close_handle): suppress warnings.
-	  see [ruby-core:31932].
-
-Thu Sep 23 18:54:39 2010  wanabe  <s.wanabe@gmail.com>
-
-	* tool/config.sub: add mingw64.
-
-	* win32/mkexports.rb (Exports::Mingw64): added.
-
-	* win32/mkexports.rb (Exports::Mingw32): renamed from Exports::Mingw.
-
-Thu Sep 23 09:01:28 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* vm_insnhelper.c (vm_cref_push): no outer cref is needed for proc
-	  from method.  Bug #3786, Bug #3860, [ruby-core:32501]
-
-Wed Sep 22 17:12:01 2010  Kazuhiro NISHIYAMA  <zn@mbf.nifty.com>
-
-	* test/openssl/utils.rb (OpenSSL#silent): always restore $VERBOSE.
-	  [ruby-dev:42285]
-
-Wed Sep 22 16:59:40 2010  Yuki Sonoda (Yugui)  <yugui@yugui.jp>
-
-	* test/test_prime.rb (TestPrime#test_new): the warning expected have
-	  not been displayed when $VERBOSE == nil. Patch by Shota Fukumori
-	  a.k.a. sora_h. [ruby-dev:42272]
-	  Recovers $stderr even if StringIO.new fails. Reported by unak.
-
-Wed Sep 22 01:55:48 2010  Koichi Sasada  <ko1@atdot.net>
-
-	* bootstraptest/test_method.rb: fix last commit.
-
-Wed Sep 22 01:49:52 2010  Koichi Sasada  <ko1@atdot.net>
-
-	* bootstraptest/test_method.rb: add a test for [ruby-core:30534].
-
-Wed Sep 22 00:52:44 2010  WATANABE Hirofumi  <eban@ruby-lang.org>
-
-	* lib/rdoc/ri/store.rb (save_cache): remove duplicate entries.
-
-Wed Sep 22 00:00:05 2010  Tanaka Akira  <akr@fsij.org>
-
-	* ext/pathname/pathname.c (path_f_pathname): Pathname() translated
-	  from pathname.rb.
-
-Tue Sep 21 22:18:30 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* tool/mkconfig.rb: fixed build problem on mswin64 introduced in r29278.
-
-Tue Sep 21 02:42:35 2010  Kazuhiro NISHIYAMA  <zn@mbf.nifty.com>
-
-	* test/pathname/test_pathname.rb (TestPathname#test_mkdir): fix typo.
-
-Mon Sep 20 23:23:05 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* dir.c (bracket): get rid of scanning at the end of the pattern
-	  string, not to raise an exception while globbing command line.
-	  [ruby-core:32478]
-
-Mon Sep 20 11:25:49 2010  Tanaka Akira  <akr@fsij.org>
-
-	* ext/pathname/pathname.c (Init_pathname): Pathname#=~ undefinition
-	  translated from pathname.rb.
-
-Mon Sep 20 02:34:11 2010  Kenta Murata  <mrkn@mrkn.jp>
-
-	* ext/bigdecimal/bigdecimal.c (check_rounding_mode, BigDecimal_mode):
-	  raise ArgumentError instead of TypeError passing invalid modes.
-
-	* test/bigdecimal/test_bigdecimal.rb (test_mode, test_round):
-	  change against the above modifications.
-
-Sun Sep 19 22:08:39 2010  Yuki Sonoda (Yugui)  <yugui@yugui.jp>
-
-	* lib/mkmf.rb (try_link): rdoc
-	  (try_compile): ditto
-	  (try_cpp): ditto
-	  (try_func): ditto
-	  (try_var): ditto
-	  (try_run): ditto
-	  (egrep_cpp): ditto
-
-Sun Sep 19 20:43:33 2010  Yuki Sonoda (Yugui)  <yugui@yugui.jp>
-
-	* configure.in (--disable-install-doc): disables capi too, in addition
-	  to rdoc.
-	  (--disable-install-rdoc): a new option for disabling only rdoc.
-	  (--disable-install-capi): a new option for disabling only capi.
-
-Sun Sep 19 20:37:45 2010  Yuki Sonoda (Yugui)  <yugui@yugui.jp>
-
-	* common.mk (clean): removes all documents on cleaning.o
-	  (CAPIOUT): new variable.
-	  (clean-capi, distclean-capi, realclean-capi): new targets
-
-	* Makefile.in (clean-capi, distclean-capi, realclean-capi): ditto.
-
-	* win32/Makefile.sub (clean-capi, distclean-capi, realclean-capi):
-	  ditto.
-
-Sun Sep 19 13:44:24 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* configure.in (LIBRUBY_SO): fix an oversight of replace
-	  RUBY_INSTALL_NAME with RUBY_SO_NAME.  a patch from Jeremy Evans
-	  at [ruby-core:32474].
-
-Sun Sep 19 07:48:20 2010  Tanaka Akira  <akr@fsij.org>
-
-	* ext/pathname/pathname.c (path_unlink): Pathname#unlink and
-	  Pathname#delete translated from pathname.rb.
-
-Sun Sep 19 06:06:07 2010  Kenta Murata  <mrkn@mrkn.jp>
-
-	* ext/bigdecimal/bigdecimal.c (check_rounding_mode): added for
-	  converting symbol to rounding mode number.
-
-	* ext/bigdecimal/bigdecimal.c (BigDecimal_mode, BigDecimal_round):
-	  support to specify rounding mode by symbol.
-
-	* test/bigdecimal/test_bigdecimal.rb (test_mode, test_round):
-	  add tests for above changes.
-
-Sun Sep 19 05:14:35 2010  Kenta Murata  <mrkn@mrkn.jp>
-
-	* ext/bigdecimal/bigdecimal.c: fix rounding algorithms for half-down
-	  and half-even.  This change is based on the patch created by Matthew
-	  Willson, the reporter of this bug.  [Bug #3803] [ruby-core:32136]
-
-	* test/bigdecimal/test_bigdecimal.rb: add tests for above changes.
-
-Sat Sep 18 20:09:51 2010  Tanaka Akira  <akr@fsij.org>
-
-	* ext/pathname/pathname.c (path_each_entry): Pathname#each_entry
-	  translated from pathname.rb.
-
-Fri Sep 17 23:44:07 2010  Kouhei Sutou  <kou@cozmixng.org>
-
-	* lib/rexml/xpath_parser.rb, test/rexml/test_xpath.rb:
-	  add missing method availability check. [ruby-core:32447]
-	  Reported by Wiebe Cazemier. Thanks!!!
-
-Fri Sep 17 23:23:26 2010  Kouhei Sutou  <kou@cozmixng.org>
-
-	* test/rexml/test_sax.rb: don't use thread and sleep to avoid slow test.
-
-Fri Sep 17 23:10:44 2010  Kouhei Sutou  <kou@cozmixng.org>
-
-	* test/rexml/test_core.rb: enable.
-
-Fri Sep 17 22:46:02 2010  Kouhei Sutou  <kou@cozmixng.org>
-
-	* test/rexml/: untabify.
-
-Fri Sep 17 22:29:56 2010  Kouhei Sutou  <kou@cozmixng.org>
-
-	* test/rexml/: fix fixture data path. All REXML tests are worked.
-
-Fri Sep 17 22:15:15 2010  Kouhei Sutou  <kou@cozmixng.org>
-
-	* test/rexml/test_listener.rb: remove needless codes.
-
-Fri Sep 17 22:12:23 2010  Kouhei Sutou  <kou@cozmixng.org>
-
-	* test/rexml/: import REXML tests from
-	  http://www.germane-software.com/repos/rexml/trunk/test/.
-	  Many tests are failed temporary. I'll fix them quickly. Sorry.
-
-Fri Sep 17 16:48:49 2010  URABE Shyouhei  <shyouhei@ruby-lang.org>
-
-	* test/io/console/test_io_console.rb (TestIO_Console::helper):
-	  PTY.open is not guaranteed to work.  On my machine opening a
-	  pty is prohibited via process control group.  On those cases
-	  exceptions shall occur, and that doesn't mean our fault.
-	  Skip those tests on such situations.
-
-Fri Sep 17 08:30:27 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* lib/tracer.rb: count only non-internal libraries in stack trace,
-	  ignoring custom_require.  [ruby-core:31858]
-
-Fri Sep 17 02:18:41 2010  Akinori MUSHA  <knu@iDaemons.org>
-
-	* tool/mkconfig.rb: Fix build with m4 1.4.15 generating duplicate
-	  lines in config.status.  According to nobu, the mswin32 port may
-	  depend on the piece of code in question, so the behavior is left
-	  unchanged on mswin32.
-
-Thu Sep 16 23:47:59 2010  Tanaka Akira  <akr@fsij.org>
-
-	* ext/pathname/pathname.c (path_opendir): Pathname#opendir translated
-	  from pathname.rb.
-
-Thu Sep 16 21:40:37 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* lib/test/unit.rb (Test::Unit::GlobOption): merged RejectOption.
-
-	* test/runner.rb: utilize GlobOption.
-
-Thu Sep 16 21:31:24 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* lib/rdoc/ri/driver.rb (RDoc::RI::Driver.setup_options)
-	  (RDoc::RI::Driver.fixup_options): split from process_args.
-	  libraries should not parse ARGV inside, since it's a task of
-	  applications, not libraries.
-
-Thu Sep 16 21:02:30 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* lib/rdoc/ri/paths.rb (RDoc::RI::Paths.each): HOMEDIR can be nil
-	  if $HOME is unset.
-
-Thu Sep 16 14:50:42 2010  URABE Shyouhei  <shyouhei@ruby-lang.org>
-
-	* test/ruby/test_file_exhaustive.rb (TestFileExhaustive::test_expand_path):
-	  ENV["HOME"] might not be set.  On those cases without it an
-	  exception raises here, which effectively disables later
-	  tests on this method.
-
-Thu Sep 16 08:30:28 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* sprintf.c (rb_f_sprintf): fix rdoc.  pointed out by Tomoyuki
-	  Chikanaga at [ruby-core:32395], and a patch from Daniel
-	  Bovensiepen at [ruby-core:32403].
-
-Thu Sep 16 08:27:36 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* ext/etc/extconf.rb: use expanded sysconfdir with empty DESTDIR.
-	  [ruby-core:32394]
-
-Thu Sep 16 06:07:24 2010  Tanaka Akira  <akr@fsij.org>
-
-	* ext/pathname/pathname.c (path_rmdir): Pathname#rmdir translated
-	  from pathname.rb.
-
-Thu Sep 16 00:36:25 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* ext/readline/extconf.rb: Remove Readline 6 check because
-	  Ruby's license is now GPLv3 compatible. [ruby-core:28736]
-
-Thu Sep 16 00:26:00 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* COPYING: change Ruby's License from a dual license with GPLv2
-	  to a dual license with 2-clause BSDL.
-	  [ruby-dev:42166] [ruby-core:31971]
-	  [ruby-dev:39167] [ruby-core:25272]
-
-	* COPYING.ja: ditto.
-
-	* BSDL: added. this is from The FreeBSD License.
-
-Wed Sep 15 21:07:06 2010  Tanaka Akira  <akr@fsij.org>
-
-	* ext/pathname/pathname.c (path_mkdir): Pathname#mkdir translated
-	  from pathname.rb.
-
-Wed Sep 15 13:37:00 2010  URABE Shyouhei  <shyouhei@ruby-lang.org>
-
-	* test/net/imap/test_imap.rb: "localhost" not guaranteed to
-	  resolve to "127.0.0.1".  On my machine it is "::1" instead.
-	  The problem is, you have to connect to the imaps server via
-	  the canonical name written in a server certificate, and that
-	  of the server.cert is "localhost".  So you have to listen to
-	  the address of what "localhost" resolves to.  I think this
-	  situation cannot be resolved in a handy manner because the
-	  test "test_imaps_post_connection_check" is actually
-	  expecting to connect to a server via an address other than
-	  the CN.  On my machine several assertions won't pass because
-	  the test cannot connect to the server.
-
-Wed Sep 15 09:12:03 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* io.c (rb_io_puts): fix for wide char encoding strings.
-	  [ruby-dev:42212]
-
-Wed Sep 15 07:27:52 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* string.c (rb_str_format_m): mentioned about Hash argument.  a patch
-	  from Daniel Bovensiepen at [ruby-core:32386].
-
-	* sprintf.c (get_hash): ditto, and fix typo.
-
-Wed Sep 15 07:22:20 2010  Tanaka Akira  <akr@fsij.org>
-
-	* ext/pathname/pathname.c (path_entries): Pathname#entries translated
-	  from pathname.rb.
-
-Wed Sep 15 02:13:44 2010  Aaron Patterson <aaron@tenderlovemaking.com>
-
-	* ext/fiddle/closure.c : Don't use FFI closure alloc on OpenBSD.
-	  Thanks Jeremy Evans! [ruby-core:32384]
-
-Tue Sep 14 20:17:48 2010  Tanaka Akira  <akr@fsij.org>
-
-	* ext/pathname/pathname.c (path_s_getwd): Pathname.getwd and
-	  Pathname.pwd translated from pathname.rb.
-
-Tue Sep 14 05:13:04 2010  Tanaka Akira  <akr@fsij.org>
-
-	* ext/pathname/pathname.c (path_s_glob): Pathname.glob translated
-	  from pathname.rb.
-
-Tue Sep 14 01:24:51 2010  Yutaka Kanemoto  <kanemoto@ruby-lang.org>
-
-	* ext/socket/raddrinfo.c (ruby_getaddrinfo__aix): suppress a
-	  warning.
-
-Mon Sep 13 20:48:30 2010  Tanaka Akira  <akr@fsij.org>
-
-	* ext/pathname/pathname.c (path_zero_p): Pathname#zero? translated
-	  from pathname.rb.
-
-Mon Sep 13 19:56:50 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* ext/socket/rubysocket.h (__DARWIN_ALIGNBYTES): workaround of a
-	  bug in system header of darwin 9.  [ruby-core:32341]
-
-Mon Sep 13 18:11:55 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* lib/mkmf.rb (try_do): fix typo.  a patch from Peter Weldon
-	  at [ruby-core:32327].
-
-Mon Sep 13 10:12:09 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* util.c (ruby_strtod): reject Float('0x0.').
-	  [ruby-dev:42239] Bug #3820
-
-Mon Sep 13 09:23:58 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* ext/openssl/ossl_bn.c (ossl_bn_is_prime): fix comparison
-	  with rb_scan_args. Before this fix, OpenSSL::BN#prime?
-	  is fully broken. [ruby-dev:42225]
-
-Mon Sep 13 06:45:24 2010  Tanaka Akira  <akr@fsij.org>
-
-	* ext/pathname/pathname.c (path_writable_real_p):
-	  Pathname#writable_real? translated from pathname.rb.
-
-Sun Sep 12 21:21:50 2010  Tadayoshi Funaba  <tadf@dotrb.org>
-
-	* lib/date.rb: [ruby-core:32096]  Thanks Colin Bartlett.
-
-Sun Sep 12 19:30:27 2010  Tanaka Akira  <akr@fsij.org>
-
-	* ext/pathname/pathname.c (path_world_writable_p):
-	  Pathname#world_writable? translated from pathname.rb.
-
-Sun Sep 12 09:16:06 2010  Tanaka Akira  <akr@fsij.org>
-
-	* ext/pathname/pathname.c (path_writable_p): Pathname#writable?
-	  translated from pathname.rb.
-
-Sun Sep 12 08:36:15 2010  Tanaka Akira  <akr@fsij.org>
-
-	* process.c (rlimit_resource_name2int): support more limits:
-	  RLIMIT_MSGQUEUE, RLIMIT_NICE, RLIMIT_RTPRIO, RLIMIT_RTTIME and
-	  RLIMIT_SIGPENDING.
-	  (Init_process): ditto.
-	  patch by Run Paint Run Run.  [ruby-core:32262]
-
-Sun Sep 12 04:27:13 2010  Tanaka Akira  <akr@fsij.org>
-
-	* process.c (rlimit_resource_name2int): use STRCASECMP to avoid
-	  ALLOCA_N.
-
-Sat Sep 11 16:47:41 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* hash.c (ruby_setenv): raise if putenv and SetEnvironmentVariable
-	  failed, because of the restriction of the size on Windows.
-	  based on a patch from Peter Weldon at [ruby-core:32304].  fix:
-	  Bug#3812, [ruby-core:32250]
-
-Sat Sep 11 15:19:57 2010  Eric Hodel  <drbrain@segment7.net>
-
-	* lib/webrick/httpauth/digestauth.rb (WEBrick::Config::DigestAuth):
-	  Add documentation
-
-	* lib/webrick/config.rb (WEBrick::Config::DigestAuth): Add
-	  documentation
-
-Sat Sep 11 12:32:05 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* include/ruby/intern.h (rb_set_kcode, rb_get_kcode): removed
-	  zombie prototype declarations.  a patch from Eric Hodel
-	  at [ruby-core:32305].
-
-Sat Sep 11 06:53:12 2010  Tanaka Akira  <akr@fsij.org>
-
-	* ext/pathname/pathname.c (path_symlink_p): Pathname#symlink?
-	  translated from pathname.rb.
-
-Fri Sep 10 23:03:43 2010  Tanaka Akira  <akr@fsij.org>
-
-	* ext/pathname/pathname.c (path_sticky_p): Pathname#sticky? translated
-	  from pathname.rb.
-
-Fri Sep 10 19:11:13 2010  NAKAMURA, Hiroshi  <nahi@ruby-lang.org>
-
-	* lib/webrick/httprequest.rb (WEBrick::HTTPRequest#continue): add
-	  method for generating HTTP/1.1 100 continue response if the client
-	  expects it, otherwise does nothing.  Patch by Brian Candler.
-	  ref #855.
-
-	* test/webrick/test_httprequest.rb: test added.
-
-Fri Sep 10 17:49:34 2010  NAKAMURA, Hiroshi  <nahi@ruby-lang.org>
-
-	* ext/openssl/lib/openssl/x509-internal.rb: removed unused local
-	  variable.
-
-	* test/openssl/*: less warnings while test running with -w.
-
-Fri Sep 10 16:49:20 2010  Akinori MUSHA  <knu@iDaemons.org>
-
-	* class.c (rb_scan_args): Add support for optional keyword
-	  argument hash. [ruby-dev:42221] [ruby-dev:38048]
-
-	* README.EXT, README.EXT.ja: Update documentation accordingly.
-
-	* dir.c (dir_initialize): Make use of the new rb_scan_args()
-	  feature.
-
-	* io.c (rb_io_s_popen, rb_scan_open_args, rb_io_initialize)
-	  (rb_io_s_pipe, open_key_args, io_s_foreach, io_s_readlines)
-	  (rb_io_s_read, rb_io_set_encoding): Ditto.
-
-	* transcode.c (str_transcode, econv_args)
-	  (econv_primitive_convert): Ditto.
-
-	* ext/zlib/zlib.c (rb_gzreader_initialize): Ditto.
-
-Fri Sep 10 10:33:18 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* random.c (rb_genrand_ulong_limited): renamed from
-	  rb_rand_internal and now this is public API.
-
-	* include/ruby/ruby.h (rb_genrand_ulong_limited): added.
-
-	* bignum.c (big_sparse_p): use rb_genrand_ulong_limited.
-
-Fri Sep 10 13:07:22 2010  NAKAMURA, Hiroshi  <nahi@ruby-lang.org>
-
-	* ext/digest/lib/digest.rb: removed unused exception variable
-	  assignment to avoid a warning.
-
-Fri Sep 10 07:29:14 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* ext/etc/etc.c (etc_systmpdir): assume system default tmpdir
-	  safe.  [ruby-dev:42089]
-
-Fri Sep 10 07:03:23 2010  Tanaka Akira  <akr@fsij.org>
-
-	* ext/pathname/pathname.c (path_size_p): Pathname#size? translated from
-	  pathname.rb.
-
-Fri Sep 10 02:15:29 2010  Tanaka Akira  <akr@fsij.org>
-
-	* ext/socket/option.c (inspect_peercred): support OpenBSD-current.
-	  patch by Jeremy Evans.  [ruby-core:32240]
-
-Thu Sep  9 23:25:53 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* vm.c (vm_backtrace_each): skip allocator frames which have no
-	  name.  [ruby-core:32231]
-
-Thu Sep  9 22:39:08 2010  Tanaka Akira  <akr@fsij.org>
-
-	* ext/pathname/pathname.c (path_size): Pathname#size translated from
-	  pathname.rb.
-
-Thu Sep  9 22:34:48 2010  wanabe  <s.wanabe@gmail.com>
-
-	* compile.c (case_when_optimizable_literal): When float value can be
-	  treated as integer, add to table hash of case that way.
-	  based on a patch from Ikuo KOBORI. [ruby-dev:42038]
-
-	* insns.def (opt_case_dispatch): ditto.
-
-	* test/ruby/test_case.rb: add tests.
-
-Thu Sep  9 17:15:15 2010  NAKAMURA, Hiroshi  <nahi@ruby-lang.org>
-
-	* test/net/http/test_https.rb (test_identity_verify_failure): follows
-	  the SSL hostname check error message of openssl.
-
-Thu Sep  9 10:44:46 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* test/ruby/test_env.rb (test_aset): OpenBSD acts like NetBSD in
-	  that it ignores characters after = in ENV.
-	  patched by Jeremy Evans [ruby-core:32184]
-
-Thu Sep  9 09:02:01 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* tool/rbinstall.rb (install?): gemspec filename should include
-	  its version. patched by Luis Lavena [ruby-core:32165]
-
-Wed Sep  8 22:46:31 2010  NAKAMURA, Hiroshi  <nahi@ruby-lang.org>
-
-	* ext/openssl/ossl_ssl.c (ssl_get_error): Thread context switch was
-	  blocked on Windows while blocking call for SSLSocket.  Need to
-	  convert errno for letting rb_io_wait_readable detect EWOULDBLOCK.
-	  Patch by arton. ref #3794.
-
-Wed Sep  8 20:56:57 2010  Tanaka Akira  <akr@fsij.org>
-
-	* ext/pathname/pathname.c (path_setgid_p): Pathname#setgid? translated
-	  from pathname.rb.
-
-Wed Sep  8 06:25:41 2010  Tanaka Akira  <akr@fsij.org>
-
-	* ext/pathname/pathname.c (path_setuid_p): Pathname#setuid? translated
-	  from pathname.rb.
-
-Tue Sep  7 21:03:35 2010  Tanaka Akira  <akr@fsij.org>
-
-	* ext/pathname/pathname.c (path_readable_real_p):
-	  Pathname#readable_real?  translated from pathname.rb.
-
-Mon Sep  6 23:07:25 2010  Tanaka Akira  <akr@fsij.org>
-
-	* ext/pathname/pathname.c (path_world_readable_p):
-	  Pathname#world_readable?  translated from pathname.rb.
-
-Mon Sep  6 11:03:13 2010  NAKAMURA, Hiroshi  <nahi@ruby-lang.org>
-
-	* Fixed wrong check of missing functions. Patch by Adrian Quark.
-	  ref #3400
-	  The patch contains following comment:
-	    This patch should avoid unnecessary incompatibility with future
-	    versions of Openssl.  Changes suggested by bmaher_at_amazon.com.
-
-Mon Sep  6 10:46:55 2010  NAKAMURA, Hiroshi  <nahi@ruby-lang.org>
-
-	* Fixed exception message for SSL post connection check failure. Patch
-	  by Paul Betteridge. ref [Bug #3704]
-
-Mon Sep  6 10:31:59 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* ext/readline/readline.c (readline_s_get_line_buffer):
-	  Readline.line_buffer should return locale string.
-	  [ruby-dev:42184] #3791
-
-Mon Sep  6 09:47:24 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* util.c (ruby_strtod): check there is at least 1 digit after
-	  "0x" before ".". [ruby-dev:42183] #3790
-
-Mon Sep  6 09:44:50 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* util.c (ruby_strtod): check integer overflow.
-	  [ruby-dev:42180] #3789
-
-Mon Sep  6 06:17:21 2010  Tanaka Akira  <akr@fsij.org>
-
-	* ext/pathname/pathname.c (path_readable_p): Pathname#readable?
-	  translated from pathname.rb.
-
-Sun Sep  5 23:02:34 2010  Tanaka Akira  <akr@fsij.org>
-
-	* ext/pathname/pathname.c (path_owned_p): Pathname#owned?
-	  translated from pathname.rb.
-
-Sat Sep  4 23:48:47 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* file.c (rb_file_s_readlink): symlink target should be in
-	  filesystem encoding.
-
-Sat Sep  4 10:40:50 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* load.c (ruby_init_ext): export for golfers.
-
-	* vm_core.h (rb_iseq_eval, rb_iseq_compile_with_option): ditto.
-
-Sun May 23 17:29:41 2010  Yuki Sonoda (Yugui)  <yugui@yugui.jp>
-
-	* common.mk (capi): uses a timestamp file to get rid of
-	  generating twice.
-
-Fri Jun 18 01:33:21 2010  Yuki Sonoda (Yugui)  <yugui@yugui.jp>
-
-	* enc/Makefile.in (realclean): has been missing. necessary
-	  for make realclean-enc.
-
-Fri Sep  3 23:51:26 2010  Tanaka Akira  <akr@fsij.org>
-
-	* ext/pathname/pathname.c (path_socket_p): Pathname#socket?
-	  translated from pathname.rb.
-
-Fri Sep  3 06:40:44 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* ext/pty/pty.c (chfunc): pass through exceptions.
-
-	* io.c (rb_io_bufwrite, rb_io_bufread): added.
-
-	* process.c (rb_fork_err): protect from exceptions.
-
-Fri Sep  3 06:16:07 2010  Tanaka Akira  <akr@fsij.org>
-
-	* ext/pathname/pathname.c (path_pipe_p): Pathname#pipe?
-	  translated from pathname.rb.
-
-Fri Sep  3 06:14:40 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* ext/pty/pty.c (chfunc): restore errno from SystemCallError and
-	  propagate proper exception to the parent.  [ruby-dev:41965]
-
-Thu Sep  2 22:10:38 2010  Tanaka Akira  <akr@fsij.org>
-
-	* ext/pathname/pathname.c (path_file_p): Pathname#file?
-	  translated from pathname.rb.
-
-Thu Sep  2 09:12:02 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* win32/win32.c (rb_w32_spawn, rb_w32_aspawn): don't forget to free
-	  memory.
-
-Thu Sep  2 09:01:13 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* win32/win32.c (CreateChild): unicodize.
-
-	* win32/win32.c (rb_w32_spawn, rb_w32_aspawn): convert arguments of
-	  CreateChild() from ACP to WideChar.
-
-Thu Sep  2 06:53:43 2010  Tanaka Akira  <akr@fsij.org>
-
-	* ext/pathname/pathname.c (path_directory_p): Pathname#directory?
-	  translated from pathname.rb.
-
-Wed Sep  1 22:03:41 2010  Tanaka Akira  <akr@fsij.org>
-
-	* ext/pathname/pathname.c (path_grpowned_p): Pathname#grpowned?
-	  translated from pathname.rb.
-
-Wed Sep  1 17:39:02 2010  Ryan Davis  <ryand-ruby@zenspider.com>
-
-	* lib/minitest/*.rb: Imported minitest 1.7.1 r5835.
-	* test/minitest/*.rb: ditto.
-
-Wed Sep  1 16:50:42 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* string.c (tr_setup_table): optimized. don't create hash objects
-	  when given pattern is ASCII only.
-
-	* string.c (tr_find): ditto.
-
-Wed Sep  1 14:35:29 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* array.c (rb_ary_rotate_m): fix typo of rdoc.
-	  patched by Andrei Kulakov [ruby-core:31975]
-
-Wed Sep  1 14:33:36 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* enum.c (enum_zip): fix typo of rdoc.
-	  patched by Andrei Kulakov [ruby-core:31974]
-
-Wed Sep  1 12:56:36 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* thread.c (ruby_suppress_tracing): restore the state and invoke
-	  the func with normal state.  a patch from Satoshi Shiba <shiba
-	  AT rvm.jp> at [ruby-dev:42162].  [ruby-core:31783]
-
-Tue Aug 31 21:10:23 2010  Tanaka Akira  <akr@fsij.org>
-
-	* ext/pathname/pathname.c (path_exist_p): Pathname#exist? translated
-	  from pathname.rb.
-
-Tue Aug 31 17:32:34 2010  Hidetoshi NAGAI  <nagai@ai.kyutech.ac.jp>
-
-	* ext/tk/stubs.c: fix [Bug #3771] "VC++ can't make ext/tk with enabling
-	  stubs". Thanks, Akio Tajima [ruby-dev:42159].
-
-Tue Aug 31 03:42:14 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* string.c (tr_setup_table): fix bug in r29146.
-	  Initialize table even if cflag is 0; tr_find see whether
-	  del is empty or not.
-
-	* string.c (tr_find): nodel can't be NULL; if NULL, it means
-	  it is not specified.
-
-Mon Aug 30 21:29:21 2010  Tanaka Akira  <akr@fsij.org>
-
-	* ext/pathname/pathname.c (path_executable_real_p):
-	  Pathname#executable_real? translated from pathname.rb.
-
-Mon Aug 30 15:00:13 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* string.c (tr_setup_table): initialize negating table when
-	  negating string is given. [ruby-core:31851]
-
-	* string.c (tr_find): add a sentence for the time when
-	  target characters include negating one.
-
-	* string.c (rb_str_count): move definition.
-
-Mon Aug 30 07:32:41 2010  Tanaka Akira  <akr@fsij.org>
-
-	* ext/pathname/pathname.c (path_executable_p): Pathname#executable?
-	  translated from pathname.rb.
-
-Sun Aug 29 23:54:10 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* lib/rdoc/parser/ruby.rb (RDoc#parse_call_parameters): don't
-	  include assignment.  [Bug #3759], [ruby-dev:42154]
-
-	* lib/rdoc/parser/ruby.rb (RDoc#parse_class): ignore non-constant
-	  name singleton class.  [Bug #3759], [ruby-dev:42154]
-
-Sun Aug 29 23:25:18 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* file.c (rb_get_path_check): clarify error message for
-	  ASCII-incompatible path name.
-
-Sun Aug 29 16:02:54 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* common.mk (node_name.inc): remove command option -n and give
-	  file as stdin, because IronRuby 1.1 still doesn't support it.
-	  So now we can use ir.exe as BASERUBY.
-
-	* tool/node_name.rb: read stdin with while gets.
-
-Sun Aug 29 13:22:43 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* vm.c (rb_thread_method_id_and_class): curried proc has no
-	  method.  [ruby-core:31871]
-
-Sun Aug 29 12:51:33 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* load.c (rb_provide_feature): clarify error message for frozen
-	  $LOADED_FEATURES.  based on a patch from Run Paint Run Run at
-	  [ruby-core:31913].
-
-Sun Aug 29 12:19:58 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* load.c (load_failed): should honor encoding.  [ruby-core:31915]
-
-Sun Aug 29 09:35:10 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* common.mk (clean): exclude *.inc. [ruby-dev:41931]
-
-	* common.mk (distclean): include *.inc.
-
-	* common.mk (help): change description about clean and distclean.
-
-Sat Aug 29 06:34:52 2010  Tanaka Akira  <akr@fsij.org>
-
-	* ext/pathname/pathname.c (path_chardev_p): Pathname#chardev?
-	  translated from pathname.rb.
-
-Sat Aug 28 17:39:33 2010  Kenta Murata  <mrkn@mrkn.jp>
-
-	* ext/bigdecimal/bigdecimal.c (BigDecimal_save_exception_mode,
-	  BigDecimal_save_rounding_mode, BigDecimal_save_limit): added.
-
-	* test/bigdecimal/test_bigdecimal.rb: added tests for the above
-	  features.
-
-Sat Aug 28 08:11:05 2010  Tanaka Akira  <akr@fsij.org>
-
-	* ext/pathname/pathname.c (path_blockdev_p): Pathname#blockdev?
-	  translated from pathname.rb.
-
-Fri Aug 27 16:20:01 2010  URABE Shyouhei  <shyouhei@ruby-lang.org>
-
-	* string.c (rb_str_prepend): new method by Shota Fukumori (sora_h)
-	  [Feature #3765]
-
-Fri Aug 27 15:24:20 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* math.c (math_atan2): you should know that M_PI is not the feature
-	  of C90.
-	  fixed build failure caused by r29115.
-
-Fri Aug 27 15:26:33 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* file.c (null_device): move from io.c.
-
-Fri Aug 27 12:47:44 2010  Kenta Murata  <mrkn@mrkn.jp>
-
-	* math.c (math_atan2): change the behavior when x and y are zero.
-	  [ruby-dev:42090] [Bug #3736] [ruby-dev:42116]
-
-	* test/ruby/test_math.rb (test_atan2): add tests for the above
-	  changes.
-
-Fri Aug 27 12:26:23 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* object.c (rb_obj_class): remove mention of obsolete method.
-	  a patch from Run Paint Run Run at [ruby-core:31842].
-
-Fri Aug 27 12:25:03 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* io.c (null_device): the name of null device.  [ruby-dev:41791]
-
-Fri Aug 27 07:57:34 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* array.c (rb_ary_shuffle_bang): bail out from modification during
-	  shuffle.
-
-	* array.c (rb_ary_sample): ditto.
-
-Fri Aug 27 05:11:51 2010  Tanaka Akira  <akr@fsij.org>
-
-	* ext/pathname/pathname.c (path_sysopen): Pathname#sysopen translated
-	  from pathname.rb.
-
-Thu Aug 26 22:53:56 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* array.c (rb_ary_shuffle): rdoc fix.  argument name was missing.
-	  a patch from Run Paint Run Run at [ruby-core:31848].
-
-Thu Aug 26 21:49:46 2010  Tanaka Akira  <akr@fsij.org>
-
-	* ext/pathname/pathname.c (path_readlines): Pathname#readlines
-	  translated from pathname.rb.
-
-Thu Aug 26 10:37:00 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* regint.h (OnigStackIndex): the type should be intptr_t.
-	  Original Oniguruma assumes the size of long and that of void *
-	  are equal, but it's not true on LLP64 platform: mswin64.
-	  originally patched by shintaro kuwamoto [ruby-dev:42133]
-
-Thu Aug 26 10:38:11 2010  Yutaka Kanemoto  <kanemoto@ruby-lang.org>
-
-	* test/dl/test_base.rb: AIX does not have dynamically loadable lib[cm].
-
-	* test/fiddle/helper.rb: AIX does not have dynamically loadable lib[cm].
-
-Thu Aug 26 09:49:50 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* array.c (rb_ary_shuffle_bang): check number of argument.
-
-Tue Aug 26 09:11:40 2010  Kenta Murata  <mrkn@mrkn.jp>
-
-	* ext/bigdecimal/bigdecimal.c (Init_bigdecimal,
-	  rmpd_set_thread_local_exception_mode, VpGetException,
-	  VpSetException): thread-local exception mode.
-
-	* ext/bigdecimal/bigdecimal.c (Init_bigdecimal,
-	  rmpd_set_thread_local_precision_limit, VpGetPrecLimit,
-	  VpSetPrecLimit): thread-local precision limit.
-
-	* ext/bigdecimal/bigdecimal.c (Init_bigdecimal,
-	  rmpd_set_thread_local_rounding_mode, VpGetRoundMode,
-	  VpSetRoundMode, VpException, VpInternalRound):
-	  thread-local rounding mode.
-
-	* ext/bigdecimal/bigdecimal.c (BigDecimal_mode, BigDecimal_round,
-	  VpIsRoundMode, VpGetRoundMode, VpSetRoundMode, VpActiveRound,
-	  VpMidRound, VpLeftRound), ext/bigdecimal/bigdecimal.h:
-	  use unsigned short for rounding mode.
-
-	* test/bigdecimal/test_bigdecimal.rb (test_mode): add test for
-	  setting rounding mode.
-
-	* test/bigdecimal/test_bigdecimal.rb (test_thread_local_mode):
-	  add test for setting mode thread-locally.
-
-Thu Aug 26 07:29:54 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* array.c (rb_ary_{shuffle_bang,sample}): use Random class object.
-
-	* random.c (try_get_rnd): use default_rand for Random as same as
-	  singleton methods.
-
-	* random.c (rb_random_real): check the range of result.
-
-Wed Aug 25 22:11:11 2010  Tanaka Akira  <akr@fsij.org>
-
-	* ext/pathname/pathname.c (path_binread): Pathname#binread translated
-	  from pathname.rb.
-
-Wed Aug 25 03:42:43 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* ext/dl/cfunc.c (rb_dlcfunc_call): workaround for VC9 for x64.
-	  reported by kuwamoto shintaro in [ruby-dev:42125].
-
-Tue Aug 24 23:28:50 2010  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* .gitignore: updated.
-
-Tue Aug 24 22:07:28 2010  Tanaka Akira  <akr@fsij.org>
-
-	* ext/pathname/pathname.c (path_read): Pathname#read translated from
-	  pathname.rb.
-
-Tue Aug 24 10:11:04 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* configure.in: read API version from include/ruby/version.h.
-
-	* {bcc,win}32/setup.mak (-version-): ditto.
-
-	* version.h (RUBY_LIB_VERSION): use API version numbers.
-
-Tue Aug 24 07:07:28 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* array.c (rb_ary_shuffle_bang, rb_ary_sample): add optional
-	  argument random.  [ruby-dev:41923] [EXPERIMENTAL]
-
-	* random.c (rb_random_{int32,real,bytes}): fallback to normal
-	  method invocation.
-
-Tue Aug 24 06:08:10 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* include/ruby/version.h (RUBY_API_VERSION_*): renamed and moved
-	  from version.h.  [ruby-dev:42103]
-
-Tue Aug 24 05:58:18 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* ChangeLog: flushed.  [ruby-dev:42050]
-
-Tue Aug 24 01:14:58 2010  Kenta Murata <mrkn@mrkn.jp>
-
-	* ext/bigdecimal/bigdecimal.c (BigDecimal_to_f): to_f must underflow
-	  when the exponent is less than DBL_MIN_10_EXP - BASE_FIG.
-
-	* test/bigdecimal/test_bigdecimal.rb (test_to_f): added test for the above changes.
-
-Mon Aug 23 23:14:21 2010  Tanaka Akira  <akr@fsij.org>
-
-	* ext/pathname/pathname.c (path_each_line): Pathname#each_line
-	  translated from pathname.rb.
-
-Mon Aug 23 22:30:58 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* common.mk (version.o): depends on both of version.h and
-	  include/ruby/version.h.   [ruby-dev:42063]
-
-Mon Aug 23 13:09:27 2010  NAKAMURA, Hiroshi  <nahi@ruby-lang.org>
-
-	* backport r29071 from ruby_1_8;
-
-	  * ext/openssl/ossl_asn1.c (obj_to_asn1bool): fixed ASN1::Boolean
-	    encoding issue for OpenSSL 1.0.0 compatibility.
-	    ASN1::Boolean.new(false).to_der wrongly generated "\1\1\377" which
-	    means 'true'.
-
-	    ASN1_TYPE_set of OpenSSL <= 0.9.8 treats value 0x100 as 'false'
-	    but OpenSSL >= 1.0.0 treats it as 'true'.  ruby-ossl was using
-	    0x100 for 'false' for backward compatibility.  Just use 0x0 for
-	    the case OpenSSL >= OpenSSL 0.9.7.
-
-	  * test/openssl/test_asn1.rb: test added.
-
-Mon Aug 23 12:28:58 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* re.c (rb_reg_search): fix: 4th argument should be regexp
-	  object. patched by shintaro kuwamoto [ruby-dev:41667] #3459
-
-Mon Aug 23 02:23:05 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* util.c (ruby_strtod): make sure to have digit-sequence after 'p'
-	  for hexadecimal-floating-constant. [ruby-dev:42105]
-
-Mon Aug 23 00:23:07 2010  Tadayoshi Funaba  <tadf@dotrb.org>
-
-	* lib/date.rb, lib/date/format.rb: [ruby-core:31695]
-
-Sun Aug 22 09:08:02 2010  Tanaka Akira  <akr@fsij.org>
-
-	* include/ruby/ruby.h (UINT2NUM): fix ifdef condition for LLP64.
-	  reported by Daniel Gutmanas.  [ruby-core:31778]
-
-Sun Aug 22 06:46:21 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* array.c (RAND_UPTO): macro for random number.
-
-Sun Aug 22 05:55:01 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* configure.in: fix typo.  a patch from Eric Wong at
-	  [ruby-core:31810].
-
-Sat Aug 21 20:09:43 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* vm.c: add missing prototype of rb_iseq_clone for r29063.
-
-Sat Aug 21 18:54:56 2010  wanabe  <s.wanabe@gmail.com>
-
-	* vm.c (vm_define_method): copy iseq to avoid overwriting iseq->klass.
-	  #2502, #3136. see #2420.
-
-Sat Aug 21 17:36:42 2010  Tanaka Akira  <akr@fsij.org>
-
-	* ext/pathname/pathname.c (path_split): Pathname#split translated from
-	  pathname.rb.
-
-Fri Aug 20 10:40:04 2010  Tanaka Akira  <akr@fsij.org>
-
-	* ext/pathname/pathname.c (path_expand_path): Pathname#expand_path
-	  translated from pathname.rb.
-
-Thu Aug 19 22:44:56 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* tool/make-snapshot (usage): add usage.
-
-	* tool/make-snapshot (package): accept revision as BRANCH@REV.
-
-Thu Aug 19 19:53:26 2010  Tanaka Akira  <akr@fsij.org>
-
-	* ext/socket/ancdata.c (ancillary_timestamp): fix a constant type.
-
-	* ext/socket/raddrinfo.c (get_afamily): suppress a warning.
-
-Thu Aug 19 19:28:47 2010  Tanaka Akira  <akr@fsij.org>
-
-	* thread_pthread.c (native_sleep): suppress a warning for platforms
-	  which time_t is int.
-
-Thu Aug 19 18:15:50 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* tool/merger.rb: Add a tool to merge commits between branches.
-	  developed by URABE Shyouhei
-
-Thu Aug 19 17:19:09 2010  NAKAMURA, Hiroshi  <nahi@ruby-lang.org>
-
-	* backport r28621 and r28632 from ruby_1_8;
-
-	  * ext/openssl/ossl_config.c, ext/openssl/lib/openssl/config.rb,
-	    ext/openssl/lib/openssl.rb: reimplement OpenSSL::Config in Ruby.
-	    Now it should work on windows.
-
-	  * test/openssl/test_config.rb: added tests for OpenSSL::Config#dup.
-
-	  * test/openssl/test_config.rb: added tests for Config#clone.
-
-Thu Aug 19 12:04:39 2010  Kenta Murata  <mrkn@mrkn.jp>
-
-	* array.c (rb_ary_permutation, rb_ary_repeated_permutation,
-	  rb_ary_repeated_combination, rb_ary_product):
-	  use ary_make_shared_copy instead of ary_make_substitution.
-	  [ruby-dev:42067] [Bug #3708]
-
-	* test/ruby/test_array.rb (test_product, test_repeated_permutation,
-	  test_repeated_combination): append assertions against [Bug #3708].
-
-Thu Aug 19 11:11:24 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* enum.c (enum_inject): fix typo of rdoc.
-	  patched by Andrei Kulakov [ruby-core:31768]
-
-Thu Aug 19 10:06:08 2010  Tanaka Akira  <akr@fsij.org>
-
-	* ext/pathname/pathname.c (path_extname): Pathname#extname translated
-	  from pathname.rb.
-
-Thu Aug 19 06:03:27 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* vm_insnhelper.c (vm_push_frame): initialize block_iseq.  a patch
-	  from Peter Weldon at [ruby-core:31757].
-
-Wed Aug 18 19:08:17 2010  Kenta Murata  <mrkn@mrkn.jp>
-
-	* array.c (ary_make_shared): revert r29037, it occurs SEGV some
-	  situations.
-
-Wed Aug 18 18:36:32 2010  Kenta Murata  <mrkn@mrkn.jp>
-
-	* array.c (ary_make_shared),
-	  test/ruby/test_array.rb (test_permutation):
-	  always return the original array when it is shared.
-	  [ruby-dev:42067] [Bug #3708]
-
-Wed Aug 18 01:37:49 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* regcomp.c: revert r26701; it introduces Bug #3681.
-	  [ruby-core:31677]
-
-Tue Aug 17 20:05:29 2010  Tanaka Akira  <akr@fsij.org>
-
-	* test/ruby/test_io.rb (test_threaded_flush): test "hi" is not output
-	  twice.
-
-Tue Aug 17 15:13:28 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* lib/date.rb: Re-revert the part of r28950.
-	  It reverted the part of r28619.
-
-Tue Aug 17 13:00:07 2010  Tanaka Akira  <akr@fsij.org>
-
-	* ext/pathname/pathname.c (path_dirname): Pathname#dirname translated
-	  from pathname.rb.
-
-Tue Aug 17 07:50:37 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* ext/readline/extconf.rb: check functions more.
-	  [ruby-core:31722]
-
-Tue Aug 17 07:42:43 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* string.c (str_make_independent_expand): set capacity properly. a
-	  patch from Peter Weldon at [ruby-core:31734].  [ruby-core:31653]
-
-Tue Aug 17 07:38:43 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* gem_prelude.rb, lib/rubygems.rb (Gem.suffixes): include empty
-	  suffix.  [ruby-core:31730]
-
-Mon Aug 16 22:16:12 2010  Tanaka Akira  <akr@fsij.org>
-
-	* ext/pathname/pathname.c (path_basename): unused variable removed.
-
-Mon Aug 16 21:39:33 2010  Tanaka Akira  <akr@fsij.org>
-
-	* ext/pathname/pathname.c (path_basename): Pathname#basename translated
-	  from pathname.rb.
-
-Mon Aug 16 20:26:13 2010  Narihiro Nakamura  <narihiro@netlab.jp>
-
-	* gc.c (gc_profile_result): Index begins with 1.
-
-Mon Aug 16 20:21:17 2010  Narihiro Nakamura  <authornari@gmail.com>
-
-	* gc.c (gc_profile_result): use size_t. based on patches from
-	Tomoaki NISHIYAMA <tomoakin@kenroku.kanazawa-u.ac.jp> at
-	[ruby-dev:42042].
-
-Mon Aug 16 19:23:19 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* util.c (ruby_dtoa, ruby_hdtoa): use same representations for
-	  Infinity and NaN.  a part of a patch from Peter Weldon at
-	  [ruby-core:31725].
-
-	* util.c (ruby_hdtoa): fixed buffer overrun.  based on a patch
-	  from Peter Weldon at [ruby-core:31725].
-
-Mon Aug 16 17:44:55 2010  Tanaka Akira  <akr@fsij.org>
-
-	* common.mk (capi): use -b option for doxygen.  It disables stdout
-	  buffering and prevents wrong reordering between stdout and stderr
-	  even when the output of "make" is redirected.
-
-Sun Aug 15 19:59:58 2010  Yuki Sonoda (Yugui)  <yugui@yugui.jp>
-
-	* lib/webrick/httpresponse.rb (WEBrick::HTTPResponse#set_error):
-	  Fix for possible cross-site scripting (CVE-2010-0541).
-	  Found by Apple, reported by Hideki Yamane.
-	  Patch by Hirokazu Nishio <nishio.hirokazu AT gmail.com>.
-
-Mon Aug 16 12:29:06 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* Makefile.in, win32/Makefile.sub (test-rubyspec-precheck): split
-	  from test-rubyspec.
-
-	* common.mk (test-rubyspec): moved from Makefile.in.
-
-Mon Aug 16 10:00:45 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* ext/bigdecimal/bigdecimal.h (llabs): never never never never never
-	  use "long long".
-
-	* ext/bigdecimal.bigdecimal.c (BigDecimal_to_i): get rid of a warning.
-
-Sun Aug 15 18:14:20 2010  Kenta Murata  <mrkn@mrkn.jp>
-
-	* ext/bigdecimal/bigdecimal.c (BigDecimal_dump, BigDecimal_inspect,
-	  VPrint, VpToString, VpVarCheck): use PRIuSIZE, PRIdSIZE, PRIdVALUE,
-	  and PRIxVALUE.
-
-Sun Aug 15 16:14:31 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* lib/mkmf.rb (Logging.postpone): close @log only when it's available.
-
-Sun Aug 15 13:30:35 2010  Kenta Murata  <mrkn@mrkn.jp>
-
-	* ext/bigdecimal/bigdecimal.h (VpVtoD): fix a type of e.
-
-	* ext/bigdecimal/bigdecimal.c (BigDecimal_dump, BigDecimal_inspect):
-	  fix format for size_t.
-
-Sun Aug 15 00:22:00 2010  Kenta Murata  <mrkn@mrkn.jp>
-
-	* ext/bigdecimal/extconf.rb, ext/bigdecimal/bigdecimal.h
-	  (labs, llabs): support environments missing labs and llabs.
-
-	* ext/bigdecimal/bigdecimal.h (vabs): added.
-
-	* ext/bigdecimal/extconf.rb, ext/bigdecimal/bigdecimal.h,
-	  ext/bigdecimal/bigdecimal.c, test/bigdecimal/test_bigdecimal.rb
-	  (TestBigDecimal#test_new): replace U_LONG, S_LONG, S_INT, and U_INT
-	  with appropriate standard or ruby-provided types.
-
-Sun Aug 15 00:15:45 2010  Tanaka Akira  <akr@fsij.org>
-
-	* ext/pathname/pathname.c (path_utime): Pathname#utime translated
-	  from pathname.rb.
-
-Sat Aug 14 21:04:28 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* thread.c (rb_gc_mark_threads): deprecated.
-
-Sat Aug 14 19:12:10 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* ext/{coverage,objspace}/extconf.rb ($INCFLAGS): explicitly add
-	  topdir and top_srcdir.  [ruby-dev:42031]
-
-Sat Aug 14 17:48:41 2010  Narihiro Nakamura  <authorNari@gmail.com>
-
-	* test/objspace/test_objspace.rb: added test for objspace.
-
-	* ext/objspace/objspace.c: considers T_ZOMBIE by lazy sweep GC.
-
-	* gc.c: considers that dsize was 0. [ruby-dev:42022]
-
-Sat Aug 14 15:33:02 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* configure.in, include/ruby/defines.h (RUBY_FUNC_EXPORTED): macro
-	  to declare exported function.
-
-	* array.c (rb_ary_memsize), string.c (rb_str_memsize),
-	  variable.c (rb_objspace_data_type_memsize): used in
-	  objspace.  [ruby-dev:42022]
-
-	* io.c (rb_io_memsize): constified.
-
-	* regcomp.c (onig_memsize): constified.
-
-	* gc.h (rb_objspace_each_objects): used in objspace.
-
-	* vm_core.h (rb_{get,set,reset}_coverages): used in coverage.
-
-	* include/ruby/intern.h (rb_time_interval): used in io/wait.
-
-	* include/ruby/intern.h (rb_make_backtrace, rb_make_exception):
-	  used in ripper.
-
-	* node.h (rb_parser_{malloc,realloc,calloc,free}): ditto.
-
-Fri Aug 13 22:48:39 2010  Tanaka Akira  <akr@fsij.org>
-
-	* ext/pathname/pathname.c (path_truncate): Pathname#truncate translated
-	  from pathname.rb.
-
-Fri Aug 13 16:11:36 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* lib/test/unit.rb (MiniTest::Unit.new): extend before initialize.
-	  [ruby-dev:41970]
-
-	* lib/test/unit.rb (MiniTest::Unit.autorun): use Test::Unit::Mini.
-
-Thu Aug 12 23:39:02 2010  Tanaka Akira  <akr@fsij.org>
-
-	* ext/pathname/pathname.c (path_make_symlink): Pathname#make_symlink
-	  translated from pathname.rb.
-
-Thu Aug 12 21:18:27 2010  Tanaka Akira  <akr@fsij.org>
-
-	* ext/pathname/pathname.c (path_lstat): Pathname#lstat translated
-	  from pathname.rb.
-
-Thu Aug 12 05:58:09 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* include/ruby/encoding.h (rb_char_to_option_kcode): used in
-	  ripper.
-
-	* node.h (rb_reserved_word): ditto.
-
-Thu Aug 12 00:19:53 2010  Tanaka Akira  <akr@fsij.org>
-
-	* test/ruby/test_rubyoptions.rb (test_script_from_stdin): disable
-	  echo.  [ruby-dev:41966]
-
-Wed Aug 11 23:28:22 2010  Kenta Murata  <mrkn@mrkn.jp>
-
-	* lib/cmath.rb (CMath.sqrt): use floating-point value.
-	  [ruby-core:31672] [Bug #3678]
-
-	* test/test_cmath.rb: added for testing lib/cmath.rb.
-
-Wed Aug 11 20:57:25 2010  Kazuhiro NISHIYAMA  <zn@mbf.nifty.com>
-
-	* NEWS: merge from branches/ruby_1_9_2, and move io/console.
-	  [ruby-dev:41924]
-
-Wed Aug 11 11:01:15 2010  Kenta Murata  <mrkn@mrkn.jp>
-
-	* ext/bigdecimal/bigdecimal.c: don't use // comment.
-
-Wed Aug 11 06:18:20 2010  Tanaka Akira  <akr@fsij.org>
-
-	* ext/pathname/pathname.c (path_stat): Pathname#stat translated
-	  from pathname.rb.
-
-Tue Aug 10 21:18:04 2010  Tadayoshi Funaba  <tadf@dotrb.org>
-
-	* complex.c (nucomp_to_[ifr]): don't allow complex with in-exact
-	  imaginary zero to be converted.
-
-Tue Aug 10 20:56:31 2010  Tanaka Akira  <akr@fsij.org>
-
-	* lib/optparse.rb: suppress a warning.
-
-	* test/test_mutex_m.rb: ditto.
-
-Tue Aug 10 20:56:13 2010  Tadayoshi Funaba  <tadf@dotrb.org>
-
-	* lib/date/format.rb (Date::Format::Bag): use Struct.
-	  as an experimental.
-
-Tue Aug 10 20:45:35 2010  Tanaka Akira  <akr@fsij.org>
-
-	* ext/pathname/pathname.c (path_rename): Pathname#rename translated
-	  from pathname.rb.
-
-Tue Aug 10 20:16:19 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* ext/dl/win32/lib/win32/resolv.rb (get_info): get rid of a warning.
-
-Tue Aug 10 19:56:13 2010  Tadayoshi Funaba  <tadf@dotrb.org>
-
-	* lib/date/format.rb: [ruby-core:31658]
-
-Tue Aug 10 17:24:56 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* README.EXT.ja: rb_tainted_str_new_cstr() is an alias of
-	  rb_tainted_str_new2().
-
-Tue Aug 10 15:24:30 2010  Kenta Murata  <mrkn@mrkn.jp>
-
-	* ext/bigdecimal/bigdecimal.c, ext/bigdecimal/bigdecimal.h,
-	  ext/bigdecimal/extconf.rb: BASE and BASE_FIG are defined
-	  based on the size of BDIGIT.
-
-	* ext/bigdecimal/bigdecimal.c, ext/bigdecimal/bigdecimal.h:
-	  use BDIGIT for Real#frac.
-
-Tue Aug 10 15:19:45 2010  Kenta Murata  <mrkn@mrkn.jp>
-
-	* ext/bigdecimal/bigdecimal.h, ext/bigdecimal/bigdecimal.c:
-	  add extern declaration of rb_cBigDecimal.
-
-Tue Aug 10 14:09:31 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* lib/webrick/httprequest.rb (WEBrick::HTTPRequest::parse_uri):
-	  rollup leading slashes. [ruby-core:31657]
-	  patched by Jamison Wilde
-	  NOTE: //authority/path is valid relative URI both RFC2396 and
-	  RFC3986. So when give a relative URI-like string to URI lib,
-	  users must care leading slashes.
-
-Tue Aug 10 11:26:33 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* lib/un.rb (httpd): SIGQUIT and SIGHUP are not guaranteed to exist.
-
-Tue Aug 10 06:26:48 2010  Tanaka Akira  <akr@fsij.org>
-
-	* ext/pathname/pathname.c (path_readlink): Pathname#readlink translated
-	  from pathname.rb.
-
-Mon Aug  9 22:15:19 2010  Tanaka Akira  <akr@fsij.org>
-
-	* ext/pathname/pathname.c (path_open): Pathname#open translated from
-	  pathname.rb.
-
-Mon Aug  9 22:11:09 2010  Tanaka Akira  <akr@fsij.org>
-
-	* test/ruby/test_signal.rb (TestSignal#test_exit_action): use
-	  Process.spawn instead of Process.fork.
-
-Mon Aug  9 15:59:02 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* lib/rubygems/source_index.rb: rename unused variable.
-
-	* lib/rubygems/specification.rb: rename unused variable.
-
-	* lib/rubygems/specification.rb: remove unused variable.
-
-Mon Aug  9 14:10:06 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* ext/nkf/nkf-utf8/nkf.c: Fix type of mimeout_state.buf.
-	  [nkf-bug:20079]
-
-Mon Aug  9 06:52:59 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* dir.c (sys_warning_1): show error message.
-
-Mon Aug  9 06:50:28 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* test/ruby/test_require.rb (test_require_too_long_filename):
-	  clear -w option.
-
-Mon Aug  9 00:18:44 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* lib/mkmf.rb ($ignore_error): initialize after $nmake.
-
-Sun Aug  8 19:16:26 2010  Tanaka Akira  <akr@fsij.org>
-
-	* ext/pathname/pathname.c (path_make_link): Pathname#make_link
-	  translated from pathname.rb.
-
-Sun Aug  8 16:42:48 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* lib/rubygems.rb (Gem.find_files): reverted to use globbing.
-
-	* lib/rubygems.rb (Gem.find_files): fixed search order same as
-	  default behavior.
-
-	* gem_prelude.rb, lib/rubygems.rb (Gem.suffixes): return truly
-	  require-able suffixes only.
-
-Sun Aug  8 13:20:57 2010  Tanaka Akira  <akr@fsij.org>
-
-	* ext/pathname/pathname.c (path_ftype): Pathname#ftype translated
-	  from pathname.rb.
-
-Sun Aug  8 12:41:19 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* parse.y (parser_tokadd_escape): no similar messages twice.
-	  [ruby-core:31048]
-
-Sun Aug  8 10:07:45 2010  Tanaka Akira  <akr@fsij.org>
-
-	* strftime.c (rb_strftime_with_timespec): suppress warnings.
-
-Sun Aug  8 08:58:42 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* common.mk (RUBY_H_INCLUDES): add subst.h.
-
-Sun Aug  8 08:55:37 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* include/ruby/ruby.h (ruby_snprintf): printf attribute.
-
-Sun Aug  8 07:47:29 2010  Tanaka Akira  <akr@fsij.org>
-
-	* lib/rbconfig/obsolete.rb: show the location which use Config.
-
-Sun Aug  8 07:29:55 2010  Tanaka Akira  <akr@fsij.org>
-
-	* ext/pathname/pathname.c (path_fnmatch): Pathname#fnmatch and
-	  Pathname#fnmatch? translated from pathname.rb.
-
-Sun Aug  8 07:18:22 2010  Tanaka Akira  <akr@fsij.org>
-
-	* include/ruby/subst.h (snprintf): redefinition moved from ruby.h.
-	  (vsnprintf): ditto.
-
-Sun Aug  8 00:41:42 2010  Tanaka Akira  <akr@fsij.org>
-
-	* include/ruby/subst.h: new file for substitute standard functions.
-
-	* include/ruby/missing.h: don't substitute "close", etc. here.
-
-	* include/ruby/ruby.h: include ruby/subst.h at last.
-	  This prevents substituting "close" in unistd.h.
-
-Sat Aug  7 19:51:10 2010  Tanaka Akira  <akr@fsij.org>
-
-	* test/ruby/envutil.rb (EnvUtil.invoke_ruby): merge stdout and stderr
-	  if capture_stderr is :merge_to_stdout.
-	  (assert_normal_exit): print abnormal output properly.
-
-Sat Aug  7 19:04:49 2010  Tanaka Akira  <akr@fsij.org>
-
-	* missing/close.c: undef the macros "getpeername", "getsockname" and
-	  "shutdown" to prevent infinite recursion.
-
-Sat Aug  7 18:37:39 2010  Tanaka Akira  <akr@fsij.org>
-
-	* missing/close.c: undef the macro "close" to prevent infinite
-	  recursion.
-
-Sat Aug  7 18:20:41 2010  Tanaka Akira  <akr@fsij.org>
-
-	* ext/pathname/pathname.c (path_lchown): Pathname#lchown translated
-	  from pathname.rb.
-
-Sat Aug  7 17:49:10 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* include/ruby/missing.h: moved BROKEN_CLOSE replacements from
-	  include/ruby/ruby.h.
-
-Sat Aug  7 17:40:24 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* mkconfig.rb, lib/rbconfig/obsolete.rb: warn obsolete and
-	  deprecated Config.
-
-Sat Aug  7 17:18:34 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* ext/extmk.rb (extract_makefile): follow the change of
-	  install-rb-default line format at r28850, which causes second
-	  run to create dummy makefiles.
-
-Sat Aug  7 14:08:44 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* lib/mkmf.rb: change instance variable to global.
-
-Sat Aug  7 13:59:19 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* ext/pathname/pathname.c (path_sub_ext): don't clobber shared string.
-	  [ruby-core:31640]
-
-Sat Aug  7 13:33:25 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* vm_eval.c (vm_call0): fix for VM_METHOD_TYPE_NOTIMPLEMENTED.
-	  [ruby-dev:41953]
-
-Sat Aug  7 09:47:06 2010  Masaki Suketa <masaki.suketa@nifty.ne.jp>
-
-	* ext/win32ole/win32ole.c: fix checking version of GCC.
-
-Sat Aug  7 09:31:48 2010  Tanaka Akira  <akr@fsij.org>
-
-	* ext/pathname/pathname.c (Init_pathname): fix number of arguments for
-	  Pathname#chown.
-
-Sat Aug  7 09:28:12 2010  Tanaka Akira  <akr@fsij.org>
-
-	* test/ruby/envutil.rb (assert_normal_exit): use assert.  fix
-	  faildesc.
-
-	* test/pathname/test_pathname.rb (test_lchmod): test Pathname#lchmod
-	  using assert_normal_exit.
-
-Sat Aug  7 08:26:26 2010  Tanaka Akira  <akr@fsij.org>
-
-	* ext/pathname/pathname.c (path_chown): Pathname#chown translated
-	  from pathname.rb.
-
-Sat Aug  7 02:09:04 2010  Tanaka Akira  <akr@fsij.org>
-
-	* ext/pathname/pathname.c (path_lchmod): Pathname#lchmod translated
-	  from pathname.rb.
-
-Fri Aug  6 21:30:06 2010  Tanaka Akira  <akr@fsij.org>
-
-	* ext/pathname/pathname.c (path_chmod): Pathname#chmod translated from
-	  pathname.rb.
-
-Fri Aug  6 20:13:42 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* rational.c (nurat_div): divided by infinity should be zero.
-
-	* rational.c (nurat_div): divided by float zero should be
-	  infinity.  [ruby-core:31626]
-
-Fri Aug  6 18:59:23 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* file.c (realpath_rec): rb_str_modify depends on the length, so
-	  resize instead.
-
-Fri Aug  6 18:56:14 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* Makefile.in (clean-ext): fixed directories to be removed.
-
-Fri Aug  6 17:42:12 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* enc/depend: add space at the beginning of @ignore_error.
-
-	* lib/mkmf.rb: ditto.
-
-Fri Aug  6 17:38:33 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* common.mk (clean): add  prelude.c, config.log, and rbconfig.rb.
-
-	* common.mk (distclean): remove encdb.h, config.log, and rbconfig.rb.
-
-Fri Aug  6 17:35:24 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* Makefile.in: ignore error from RMDIRS.
-
-	* enc/depend: ditto.
-
-	* lib/mkmf.rb: ditto.
-
-Fri Aug  6 05:53:32 2010  Tanaka Akira  <akr@fsij.org>
-
-	* ext/pathname/pathname.c (path_mtime): Pathname#mtime translated from
-	  pathname.rb.
-
-Thu Aug  5 22:09:30 2010  Tanaka Akira  <akr@fsij.org>
-
-	* ext/pathname/pathname.c (path_ctime): Pathname#ctime translated from
-	  pathname.rb.
-
-Thu Aug  5 21:20:31 2010  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* compile.c (NODE_ARGSCAT, NODE_ARGSPUSH): drop unused ARGSCAT
-	  results when popped is true.  [ruby-dev:41933], [Bug #3658]
-	  This is retry of r28870 and r28873 which were reverted.
-
-Thu Aug  5 20:13:49 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* README.EXT, README.EXT.ja (String functions): mention
-	  rb_str_resize and rb_str_set_len.
-
-Thu Aug  5 19:59:55 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* string.c (rb_str_set_len): bail out when buffer overflowed
-	  probably.
-
-Thu Aug  5 18:36:11 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* complex.c (nucomp_marshal_load): should check the argument.
-	  [ruby-core:31622]
-
-	* rational.c (nurat_marshal_load): ditto
-
-	* marshal.c (w_float): should not append a dot if no fractal part
-	  exists.  [ruby-dev:41936]
-
-Thu Aug  5 17:11:43 2010  Yukihiro Matsumoto  <matz@ruby-lang.org>
-
-	* parse.y (void_expr_gen): add 'possibly' to warning message.
-	  [ruby-core:31611]
-
-Thu Aug  5 16:57:20 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* dir.c (glob_make_pattern): fold continuous PLAINs to get rid of
-	  snail at too deep path.  [ruby-dev:41871]
-
-Thu Aug  5 16:42:41 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* string.c (rb_str_set_len): should fail to modify shared string.
-
-Thu Aug  5 14:12:44 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* ruby.c (ruby_init_loadpath_safe): ensure sopath to be modifiable
-
-Thu Aug  5 12:39:14 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* string.c (str_make_independent_expand): fix buffer overflow
-	  while shrinking.
-
-Thu Aug  5 06:42:31 2010  Tanaka Akira  <akr@fsij.org>
-
-	* file.c (realpath_rec): call rb_str_modify before rb_str_set_len.
-
-Wed Aug  4 19:37:00 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* string.c (rb_str_set_len): rb_str_modify cannot work before the
-	  length is set, which is a precondition for rb_str_modify.
-
-Wed Aug  4 15:47:21 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* lib/mkmf.rb (create_makefile): no need to create the directory
-	  at each library file. this change makes making ext faster.
-
-Wed Aug  4 06:25:04 2010  Tanaka Akira  <akr@fsij.org>
-
-	* ext/pathname/pathname.c (path_atime): Pathname#atime translated from
-	  pathname.rb.
-
-Tue Aug  3 21:16:03 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* random.c (Init_Random): add Random::DEFAULT.
-
-Tue Aug  3 21:01:10 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* hash.c (rb_check_hash_type): added.
-
-Tue Aug  3 20:30:16 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* bignum.c (rb_big_eq): never equal to infinity.
-	  [ruby-core:31603]
-
-	* rational.c (nurat_div): hack for integral float divisor.
-
-Tue Aug  3 14:42:12 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* ext/extmk.rb: remove purelib, fixes a bug in r28440, r28441.
-
-	* spec/default.mspec: ditto.
-
-	* template/Doxyfile.tmpl: ditto.
-
-Tue Aug  3 14:19:42 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* lib/rdoc/ri/driver.rb (setup_pager): no need to check the existence
-	  of pagers. the following code checks whether they are executable or
-	  not.
-
-Tue Aug  3 12:03:57 2010  URABE Shyouhei  <shyouhei@ruby-lang.org>
-
-	* tool/runruby.rb: no purelib.
-
-Tue Aug  3 07:52:20 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* ext/purelib.rb: no longer used since the default load path of
-	  miniruby is empty.
-
-Tue Aug  3 00:53:47 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* insns.def, vm_core.h: fixed typo.  reported by Rocky Bernstein
-	  <rockyb AT rubyforge.org> at [ruby-core:31596].
-
-Mon Aug  2 21:51:16 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* ruby.c (ruby_init_loadpath_safe): rb_str_set_len modifies ptr
-	  since r26303.
-
-Mon Aug  2 21:16:03 2010  Masaki Suketa <masaki.suketa@nifty.ne.jp>
-
-	* ext/win32ole/win32ole.c: NONAMELESSUNION defined only if gcc
-	  version is older than 3.4.4. [ruby-core:31567] [Bug #3637]
-	* ext/win32ole/extconf.rb: ditto.
-
-Mon Aug  2 16:34:32 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* thread_win32.c (native_thread_join): need to wait thread, of course.
-	  [ruby-dev:41911]
-
-Mon Aug  2 12:22:22 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* file.c (file_expand_path): wrong condition. [ruby-core:31591]
-
-Mon Aug  2 05:34:48 2010  Tanaka Akira  <akr@fsij.org>
-
-	* ext/pathname/pathname.c (path_realdirpath): Pathname#realdirpath
-	  translated from pathname.rb.
-
-Sun Aug  1 23:04:49 2010  Tanaka Akira  <akr@fsij.org>
-
-	* lib/pp.rb: describe superclasses explicitly.
-
-Sun Aug  1 23:04:35 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* string.c (rb_str_modify_expand, rb_str_resize): get rid of
-	  repeating malloc and realloc.
-
-Sun Aug  1 22:16:30 2010  Kenta Murata  <mrkn@mrkn.jp>
-
-	* ext/bigdecimal/bigdecimal.c (BigDecimal_hash): use rb_memhash and
-	  take care of negative finite numbers properly.
-	  [ruby-core:31582][Bug #3640]
-
-Sun Aug  1 20:57:22 2010  Tanaka Akira  <akr@fsij.org>
-
-	* ext/pathname/pathname.c (path_realpath): Pathname#realpath translated
-	  from pathname.rb.
-
-Sun Aug  1 17:27:32 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* win32/Makefile.sub: needs stddef.h for size_t.  a patch from
-	  Akio Tajima at [ruby-dev:41905].
-
-Sun Aug  1 14:59:04 2010  Tanaka Akira  <akr@fsij.org>
-
-	* ext/pathname/pathname.c (path_sub_ext): Pathname#sub_ext translated
-	  from pathname.rb.
-
-Sun Aug  1 10:23:48 2010  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* lib/irb/init.rb (IRB.parse_opts): set VERBOSE to true when debug
-	  switch called in irb.  a patch from Andrew Grimm in
-	  [ruby-core:31558].
-
-Sun Aug  1 09:35:35 2010  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* bignum.c (big_op): comparison of bignum and infinity has returned 1
-	  or -1, but it must return boolean.
-
-Sun Aug  1 09:44:25 2010  Tanaka Akira  <akr@fsij.org>
-
-	* class.c (rb_include_module): don't clear the method cache if the
-	  included module has no method.
-	  reported by Eric Wong.  [ruby-core:31559]
-
-Sun Aug  1 09:21:32 2010  Tanaka Akira  <akr@fsij.org>
-
-	* ext/pathname/pathname.c (path_sub): Pathname#sub translated
-	  from pathname.rb.
-
-Sun Aug  1 09:12:50 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* include/ruby/win32.h: latest x86_64 mingw defines stati64.
-	  [ruby-core:27516]
-
-Sun Aug  1 08:51:52 2010  Masaki Suketa <masaki.suketa@nifty.ne.jp>
-
-	* ext/win32ole/win32ole.c: fix typo. [ruby-core:31564][Bug #3636]
-
-Sat Jul 31 23:15:27 2010  Tanaka Akira  <akr@fsij.org>
-
-	* ext/pathname/pathname.c (path_inspect): Pathname#inspect translated
-	  from pathname.rb.
-
-Sat Jul 31 15:50:03 2010  Tanaka Akira  <akr@fsij.org>
-
-	* ext/pathname/pathname.c (Init_pathname): The alias,
-	  Pathname#to_path, is translated from pathname.rb.
-
-Sat Jul 31 09:12:36 2010  Tanaka Akira  <akr@fsij.org>
-
-	* ext/pathname/pathname.c (path_to_s): Pathname#to_s translated
-	  from pathname.rb.
-
-Sat Jul 31 08:20:07 2010  NAKAMURA, Hiroshi  <nahi@ruby-lang.org>
-
-	* lib/webrick/ssl.rb (WEBrick::Utils.create_self_signed_cert):
-	  merged r28784 from ruby_1_8: wrongly created dummy SSL certificate
-	  with version == 3 (no such version) and serial == 0 (must be >0).
-
-Fri Jul 30 21:43:55 2010  Tanaka Akira  <akr@fsij.org>
-
-	* ext/pathname/pathname.c (path_hash): Pathname#hash translated
-	  from pathname.rb.
-
-Fri Jul 30 12:42:02 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* lib/net/imap.rb (example): use IO#noecho to read password if
-	  possible, and defer until needed.  [ruby-dev:41889]
-
-	* lib/net/imap.rb (example): support starttls option.
-	  [ruby-dev:41888]
-
-Fri Jul 30 08:51:51 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* file.c (file_expand_path): home directory must be absolute.
-	  [ruby-core:31537]
-
-Fri Jul 30 08:33:20 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* file.c (file_expand_path): should check if could find user.
-	  [ruby-core:31538]
-
-Fri Jul 30 07:59:53 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* util.c (ruby_add_suffix): fixed a bug returning uninitialized
-	  value.
-
-Fri Jul 30 07:48:04 2010  Hidetoshi NAGAI  <nagai@ai.kyutech.ac.jp>
-
-	* ext/tk/extconf.rb: use TK_XINCLUDES on tkConfig.sh when not empty,
-	  even if MacOS X Aqua version [ruby-dev:41883].
-
-Thu Jul 29 22:28:35 2010  Tanaka Akira  <akr@fsij.org>
-
-	* ext/pathname/pathname.c (path_cmp): Pathname#<=> translated
-	  from pathname.rb.
-
-Thu Jul 29 06:51:30 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* common.mk (EXT_SRCS): add ext/json/parser/parser.c.
-
-Thu Jul 29 05:52:15 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* file.c (rb_file_s_basename): pass baselen to rmext.
-
-Thu Jul 29 02:38:09 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* configure.in: not [freebsd] but [freebsd*] for AS_CASE.
-
-Wed Jul 28 22:23:59 2010  Tanaka Akira  <akr@fsij.org>
-
-	* ext/pathname/pathname.c (path_eq): Pathname#{==,===,eql?} translated
-	  from pathname.rb.
-
-Wed Jul 28 19:37:33 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* win32/Makefile.sub (config.h): VC6 or later have stddef.h.
-
-	* include/ruby/missing.h: need to include stddef.h for size_t.
-
-	* include/ruby/missing.h: shouldn't declare as dllimport when building
-	  ruby itself (for Windows).
-
-Wed Jul 28 17:11:48 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* missing/*.c: include missing.h
-
-Wed Jul 28 09:38:03 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* cont.c: typos.
-
-Wed Jul 28 09:24:43 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* cont.c: (RB_PAGE_SIZE): renamed from PAGE_SIZE. [ruby-dev:41870]
-
-	* cont.c: (RB_PAGE_MASK): renamed from PAGE_MASK.
-
-Tue Jul 27 23:09:09 2010  Tanaka Akira  <akr@fsij.org>
-
-	* ext/pathname/pathname.c (path_taint): use rb_obj_taint.
-	  (path_untaint): Pathname#untaint translated from
-	  pathname.rb.
-
-Tue Jul 27 18:59:15 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* lib/mkmf.rb (have_framework): added.
-
-Tue Jul 27 18:33:42 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* defines.h, intern.h, missing.h, ruby.h, st.h, util.h: include
-	  config.h and defines.h for autoconf macros.
-
-Tue Jul 27 16:27:38 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* numeric.c (flo_cmp): typo.
-
-Tue Jul 27 16:09:12 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* class.c, compile.c, dir.c, file.c, iseq.c, parse.y, random.c:
-	  clean unused-value warnings.
-
-	* cont.c, process.c, vm_exec.h: clean cast warnings.
-
-Mon Jul 26 22:34:37 2010  Tanaka Akira  <akr@fsij.org>
-
-	* ext/pathname/pathname.c (path_taint): Pathname#taint translated from
-	  pathname.rb.
-
-Mon Jul 26 18:18:09 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* configure.in (config.h): add include guard.
-
-	* win32/Makefile.sub, bcc32/Makefile.sub (config.h): ditto.
-
-Mon Jul 26 14:38:06 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* configure.in (XCFLAGS): missing.h needs config.h.
-
-Mon Jul 26 14:08:47 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* include/ruby/missing.h: revert a part of r28727.  config.h is expected
-	  to include only once, before including defines.h.
-	  including it here breaks some macro definitions.
-
-Mon Jul 26 13:52:25 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* configure.in: define BROKEN_CLOSE only on FreeBSD.
-	  This needs to merge to 1.9.2.
-
-Mon Jul 26 13:01:25 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* vm.c (rb_thread_mark): should mark iseq itself other than normal
-	  iseq.  [ruby-dev:41880]
-
-Mon Jul 26 11:51:01 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* configure.in: define BROKEN_CLOSE on FreeBSD.
-	  This fixes build failure on MSVC. [ruby-core:31481]
-
-	* include/ruby/ruby.h, include/ruby/missing.h:
-	  use BROKEN_CLOSE for replacing close(2).
-
-Mon Jul 26 09:51:20 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* vm.c (rb_thread_mark): mark only self of normal iseqs, not
-	  nodes.  [ruby-dev:41874]
-
-Sun Jul 25 05:37:20 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* numeric.c (flo_cmp): honor the result of infinite? method of the
-	  other.  [ruby-core:31470]
-
-	* test/ruby/envutil.rb (EnvUtil#.suppress_warning): added.
-
-	* test/ruby/test_float.rb (TestFloat#test_Float): suppress
-	  warnings under --verbose.
-
-Fri Jul 23 16:07:32 2010  Shugo Maeda  <shugo@ruby-lang.org>
-
-	* lib/mutex_m.rb (sleep): added Mutex_m#sleep to support
-	  ConditionVariable.
-
-Fri Jul 23 15:09:22 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* configure.in (RUBY_MINGW32): ignore msvc suffix.
-
-	* configure.in (RUBY_TRY_CFLAGS): try with werror turned on.
-
-Fri Jul 23 09:02:43 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* re.c (rb_reg_expr_str): fixed out-of-boundary access at invalid
-	  multibyte characters.
-
-Fri Jul 23 09:00:05 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* configure.in (XCFLAGS): reverted mistakenly removed option.
-	  [ruby-dev:41872]
-
-	* include/ruby/missing.h: needs ruby/config.h.
-
-Thu Jul 22 20:58:55 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* configure.in (RUBY_EXTERN): unnecessary after all.
-
-Thu Jul 22 17:33:47 2010  Yukihiro Matsumoto  <matz@ruby-lang.org>
-
-	* complex.c (nucomp_to_i): allow complex with imaginary zero to be
-	  converted.
-
-	* complex.c (nucomp_to_f, nucomp_to_r): ditto.
-
-Thu Jul 22 20:12:56 2010  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* thread_pthread.c (get_stack): fix memory leak; pthread_attr_destroy
-	  must be called even when pthread_getattr_np is used.
-	  [ruby-core:31269]
-
-Thu Jul 22 16:27:41 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* re.c (rb_reg_expr_str): fix broken Regexp#inspect when it
-	  is ASCII-8BIT and non-ASCII character.
-	  The length of character should be from original byte string.
-	  [ruby-core:31431]
-
-Thu Jul 22 14:30:17 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* include/ruby/missing.h: add prototype for ruby_close().
-
-Thu Jul 22 12:58:12 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* configure.in (RUBY_EXTERN): ignore invalid attribute.
-
-	* configure.in: fix for older autoconf.
-
-Thu Jul 22 12:02:31 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* include/ruby/{intern,io}.h: add missing prototypes.
-
-Thu Jul 22 06:38:18 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* configure.in (XCFLAGS): use -fvisibility=hidden if possible.
-
-	* configure.in (RMDIR): use --ignore-fail-on-non-empty if possible.
-
-	* configure.in (RUBY_EXTERN): FUNCTION-BODY was missing.
-
-Thu Jul 22 03:02:55 2010  Eric Hodel  <drbrain@segment7.net>
-
-	* README.EXT: fix signature of rb_ensure and rb_rescue to match
-	  implementation.
-
-Wed Jul 21 23:07:11 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* template/fake.rb.in: get rid of embedding an absolute path.
-
-Wed Jul 21 15:22:17 2010  Evan Phoenix <evan@fallingsnow.net>
-
-	* lib/rubygems/custom_require.rb, gem_prelude.rb: Load code from
-	  from gems properly.
-
-Wed Jul 21 15:15:02 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* sprintf.c: add short documentation about named reference.
-	  [ruby-core:31294]
-
-Wed Jul 21 15:00:19 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* parse.y (local_push_gen): disable unused variable warnings in
-	  eval.  [ruby-dev:41869]
-
-Wed Jul 21 13:57:37 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* vm_method.c (rb_method_boundp): revert r28543, r28564.
-	  They may be merged in Ruby 2.0. [ruby-core:31217]
-
-Wed Jul 21 13:37:35 2010  Marc-Andre Lafortune  <ruby-core@marc-andre.ca>
-
-	* lib/uri/common.rb: Have URI#route_to, URI#route_from accept
-	  string-like arguments [ruby-core:30961]
-
-	* lib/uri/generic.rb: ditto for URI.join, URI#merge
-
-Wed Jul 21 12:39:15 2010  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* lib/cmath.rb (CMath#cbrt): cbrt should accept a negative real
-	  numbers.  [ruby-core:31234]
-
-Wed Jul 21 12:31:30 2010  Marc-Andre Lafortune  <ruby-core@marc-andre.ca>
-
-	* lib/uri/common.rb: Have URI() and URI.join accept URI objects in
-	  addition to strings. [ruby-core:30960]
-
-Wed Jul 21 11:55:06 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* util.c (ruby_hdtoa): renamed from BSD__hdtoa.
-
-Tue Jul 20 11:35:11 2010  Evan Phoenix  <evan@ruby-lang.org>
-
-	* lib/rubygems.rb: Load the custom require if --disable-rubygems
-	  was used.
-
-Tue Jul 20 11:27:18 2010  Evan Phoenix  <evan@ruby-lang.org>
-
-	* gem_prelude.rb: Pull in rubygem's custom require
-
-	* lib/rubygems.rb: Handle always having custom require available
-
-Tue Jul 20 18:39:18 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* include/ruby/ruby.h (RSTRING_GETMEM): new macro to get ptr and
-	  len at once.
-
-	* string.c (rb_str_cmp, str_eql, rb_str_eql): trivial improvements.
-
-Tue Jul 20 18:23:04 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* ext/fiddle/closure.c (closure_data_type),
-	  ext/fiddle/function.c (function_data_type): rb_data_type_t has
-	  changed.
-
-Tue Jul 20 14:21:38 2010  Narihiro Nakamura  <authorNari@gmail.com>
-
-	* gc.c: don't call after_gc_sweep() after when garbage_collect()
-	  was called, because rb_sweep_method_entry() free live unlinked
-	  method entries. [ruby-core:31169]
-
-Tue Jul 20 12:42:06 2010  URABE Shyouhei  <shyouhei@ruby-lang.org>
-
-	* ext/socket/raddrinfo.c (rb_getaddrinfo): according to my
-	  valgrind output this variable should be initialized beforehand.
-
-Tue Jul 20 12:50:37 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* io.c (io_flush_buffer): write and buffer operations should be
-	  monolithic.  [ruby-core:31348]
-
-Tue Jul 20 12:27:56 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* lib/fileutils.rb (FileUtils::Entry_#copy): check file name
-	  separator boundary.  [ruby-core:31360]
-
-Mon Jul 19 18:34:12 2010  Tanaka Akira  <akr@fsij.org>
-
-	* ext/pathname/pathname.c (get_strpath): check the type.
-	  (path_initialize): bypass to_path call for T_STRING.
-	  (path_freeze): implemented.
-
-	* ext/pathname/lib/pathname.rb (Pathname#freeze): removed.
-
-Mon Jul 19 12:33:29 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* array.c (rb_ary_clear): should not unshare embedded array, and
-	  should make unshared array embedded.
-
-Mon Jul 19 09:00:58 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* NEWS (Kernel#instance_eval): add an incompatible change since
-	  the 1.9.1 release.  [ruby-core:31336]
-
-Mon Jul 19 05:46:09 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* include/ruby/ruby.h (rb_data_type_t): add new feature macros.
-
-Sun Jul 18 21:20:11 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* array.c (rb_ary_clear): no need to duplicate buffer just before
-	  clearing.
-
-Sun Jul 18 16:31:50 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* include/ruby/ruby.h (rb_data_type_t): restructured.  [ruby-dev:41862]
-	  add parent member.
-
-	* error.c (rb_typeddata_inherited_p): new function.
-
-Sun Jul 18 01:09:27 2010  Tanaka Akira  <akr@fsij.org>
-
-	* ext/pathname/pathname.c (path_initialize): return a value.
-
-Sun Jul 18 00:02:19 2010  Tanaka Akira  <akr@fsij.org>
-
-	* ext/pathname/lib/pathname.rb (Pathname#initialize): removed.
-
-	* ext/pathname/pathname.c (path_initialize): implemented.
-	  (get_strpath): new function.
-	  (set_strpath): ditto.
-
-Sat Jul 17 19:01:47 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* lib/test/unit.rb (MiniTest::Unit#process_args): refactored.
-
-Sat Jul 17 18:30:05 2010  Tanaka Akira  <akr@fsij.org>
-
-	* tool/file2lastrev.rb: don't depend on pathname.rb if File.realpath
-	  is available.
-
-Sat Jul 17 14:10:20 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* util.c (ruby_add_suffix): fixed type warnings.
-
-Sat Jul 17 13:48:22 2010  Tanaka Akira  <akr@fsij.org>
-
-	* ext/pathname/lib/pathname.rb: moved from lib/pathname.rb.
-	  require pathname.so.
-
-	* ext/pathname/pathname.c: new file to define empty Pathname class.
-
-	* ext/pathname/extconf.rb: new file.
-
-Sat Jul 17 13:04:45 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* thread.c (rb_thread_wakeup_alive): split from rb_thread_wakeup.
-	  merged from r13476.  c.f. [ruby-core:31320]
-
-Sat Jul 17 10:07:52 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* lib/test/unit.rb: MiniTest::Unit is different class from
-	  Test::Unit, and install runner before loading test/minitest.
-
-Fri Jul 16 14:58:38 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* lib/test/unit.rb (Test::Unit.setup_argv): run tests only when
-	  any tests have not run.
-
-	* bin/testrb, test/runner.rb: use Test::Unit.start.
-
-Fri Jul 16 12:06:08 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* tool/rbinstall.rb (ext-arch): prune directories start with '-'.
-
-Thu Jul 15 21:43:35 2010  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* numeric.c (fix_divide): must not use rb_rational_new1 for coercion
-	  because it returns an argument itself when canonical mode is set.
-	  [ruby-core:31279]
-
-Thu Jul 15 21:38:31 2010  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* proc.c (bm_free): fix memory leak.  [ruby-core:30869] [Bug #3466]
-
-Thu Jul 15 15:47:32 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* regexec.c (onig_search): don't skip non-ANYCHARs when
-	  .* fails to match. This causes to fail matching
-	  ANYCHAR_STAR with LOOK_BEHIND. This fix is workaround
-	  and disable the optimization. [ruby-dev:41851]
-
-Thu Jul 15 06:11:29 2010  Aaron Patterson <aaron@tenderlovemaking.com>
-
-	* lib/rdoc/markup/attribute_manager.rb: fixing ri output when special
-	  characters are inside html tags.  Thanks Tomo Kazahaya! [Bug #3512]
-
-Thu Jul 15 06:01:42 2010  Tanaka Akira  <akr@fsij.org>
-
-	* time.c (guess_local_offset): use the UTC offset of an older date on
-	  64bit time_t environment.
-
-Thu Jul 15 02:42:51 2010  Aaron Patterson <aaron@tenderlovemaking.com>
-
-	* lib/test/unit.rb (setup_argv): convert to using optparse, adding
-	  --help and -I. [ruby-core:30154]
-
-Thu Jul 15 00:35:09 2010  Tanaka Akira  <akr@fsij.org>
-
-	* time.c (localtime_with_gmtoff_zone): renamed from
-	  localtime_with_gmtoff and return the timezone abbreviation name.
-	  (guess_local_offset): return the isdst and timezone abbreviation name.
-	  (localtimew): use the returned isdst and timezone abbreviation name.
-	  [ruby-core:31275]
-
-Wed Jul 14 20:23:08 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* eval.c (frame_func_id), vm_eval.c (rb_iterate),
-	  vm_insnhelper.c (vm_yield_with_cfunc): as the name of a C-level
-	  block, use the current method ID at the creation point.
-	  [ruby-dev:41852]
-
-Wed Jul 14 18:18:05 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* regexec.c (match_at): add end point to enclen's argument.
-	  This only effect on compiling with -DONIG_DEBUG_MATCH.
-
-Tue Jul 13 21:34:17 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* ext/readline/readline.c: libedit is missing declaration of
-	  rl_getc.
-
-Tue Jul 13 21:31:15 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* process.c (rb_daemon): split from proc_daemon.
-
-	* process.c (rb_fork_err): suppress gcc 4.4 warnings.
-
-	* random.c (fill_random_seed): ditto.
-
-Tue Jul 13 21:01:44 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* ext/pty/pty.c (establishShell): chfunc must not raise any
-	  exceptions.
-
-Tue Jul 13 20:58:57 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* configure.in (RUBY_DEFAULT_ARCH): adjust for target
-	  cpu. [ruby-core:31243]
-
-Tue Jul 13 20:46:00 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* ext/dl/handle.c (rb_dlhandle_close): should not pass a dynamic
-	          string to rb_raise directly.
-
-Tue Jul 13 12:04:57 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* missing/close.c: keep original errno.
-
-Mon Jul 12 01:58:56 2010  Marc-Andre Lafortune  <ruby-core@marc-andre.ca>
-
-	* lib/csv.rb: Fix unused variable warnings.
-	  Patch by Run Paint [ruby-core:30991]
-
-	* lib/date.rb: ditto
-
-	* lib/debug.rb: ditto
-
-	* lib/drb/drb.rb: ditto
-
-	* lib/drb/invokemethod.rb: ditto
-
-	* lib/irb/ruby-lex.rb: ditto
-
-	* lib/irb/slex.rb: ditto
-
-	* lib/logger.rb: ditto
-
-	* lib/pathname.rb: ditto
-
-Sun Jul 11 21:20:27 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* README.EXT{,.ja} (rb_block_call): fixed about third/fourth
-	  arguments to the block.  based on [ruby-core:31192] by Asher
-	  Haig.  [Bug #3558]
-
-Sun Jul 11 17:01:57 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* Makefile.in ({,dist-,real-}clean-ext): should also omit
-	  semicolon when omitting "in WORDS" of FOR-statement.
-
-	* tool/rmdirs: ditto.
-
-Sun Jul 11 11:07:42 2010  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* test/rdoc/test_rdoc_ri_driver.rb (test_formatter): add a test.  a
-	  patch from caleb clausen in [ruby-core:31182].
-
-Sat Jul 10 21:43:11 2010  Tanaka Akira  <akr@fsij.org>
-
-	* strftime.c (rb_strftime_with_timespec): fix precision handling for
-	  %:z and %::z.
-
-Fri Jul  9 22:32:54 2010  Tanaka Akira  <akr@fsij.org>
-
-	* strftime.c: unused declarations removed.
-
-Fri Jul  9 21:20:22 2010  Tanaka Akira  <akr@fsij.org>
-
-	* strftime.c (rb_strftime_with_timespec): clear colons at unknown
-	  directive.
-
-Fri Jul  9 21:04:10 2010  Tanaka Akira  <akr@fsij.org>
-
-	* strftime.c: don't call tzset.  strftime.c doesn't depend on
-	  the global timezone.
-
-Fri Jul  9 20:30:26 2010  Tanaka Akira  <akr@fsij.org>
-
-	* time.c (find_time_t): 24:00 should be the beginning of the next
-	  day even if the leap second, 23:59:60, exists.
-
-Fri Jul  9 01:08:46 2010  Aaron Patterson <aaron@tenderlovemaking.com>
-
-	* ext/psych/lib/psych/visitors/emitter.rb (initialize): line_width is
-	  a valid option passed to the emitter.
-
-	* test/psych/test_psych.rb: corresponding tests.
-
-Fri Jul  9 00:49:46 2010  Aaron Patterson <aaron@tenderlovemaking.com>
-
-	* ext/psych/emitter.c (line_width, set_line_width): preferred line may
-	  be set on the emitter.
-
-	* test/psych/test_emitter.rb: corresponding tests.
-
-Thu Jul  8 15:47:34 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* string.c (rb_str_conv_enc_opts): fix infinite loop because
-	  of ISO-2022-JP conversion with empty string.
-	  patched by Brian Buchanan [ruby-core:31107]
-
-Thu Jul  8 08:16:57 2010  Aaron Patterson <aaron@tenderlovemaking.com>
-
-	* ext/psych/lib/psych/visitors/yaml_tree.rb (push): adding version
-	  and header emit options.
-
-	* test/psych/test_psych.rb: corresponding test.
-
-Thu Jul  8 08:01:03 2010  Aaron Patterson <aaron@tenderlovemaking.com>
-
-	* ext/psych/emitter.c: updating documentation about emit options
-
-	* ext/psych/lib/psych/core_ext.rb: ditto
-
-	* ext/psych/lib/psych.rb (dump): passing emit options to emitter.
-
-	* ext/psych/lib/psych/nodes/node.rb: ditto
-
-	* ext/psych/lib/psych/visitors/emitter.rb: sending emit options to
-	  YAML emitter. [ruby-core:28318]
-
-Thu Jul  8 06:05:58 2010  Tanaka Akira  <akr@fsij.org>
-
-	* strftime.c (rb_strftime_with_timespec): support %:z and %::z.
-	  [ruby-dev:41841]
-
-Thu Jul  8 00:15:50 2010  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* gem_prelude.rb: provide workaround for gem activation.  Currently,
-	  gem activation does not work by default.  Now it can be worked
-	  around by requiring "rubygems" first.  [ruby-core:29486]
-	  a patch from Evan Phoenix in [ruby-core:31096].
-
-	* lib/rubygems.rb: ditto.
-
-Wed Jul  7 10:01:34 2010  Adrian Bloomer  <adrian.bloomer@gmail.com>
-
-	* numeric.c (fix_rev): Replaced fix_rev with '~num | FIXNUM_FLAG'.
-
-Wed Jul  7 13:22:20 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* file.c (ruby_find_basename): set correct baselen.
-
-Wed Jul  7 13:02:59 2010  Akinori MUSHA  <knu@iDaemons.org>
-
-	* vm_method.c (rb_method_boundp): respond_to?(:protected_method,
-	  true) should return true.  Pointed out by Marc-Andre Lafortune.
-	  [ruby-dev:41837]
-
-Wed Jul  7 12:00:24 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* file.c (ruby_find_basename): should initialize f.
-
-Wed Jul  7 11:44:01 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* ext/zlib/zlib.c (gzfile_raise): add invalid header to
-	  exceptions.
-
-Wed Jul  7 10:26:20 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* missing/close.c: ignore ECONNRESET.
-	  FreeBSD wrongly sets ECONNRESET on close(2) and
-	  it causes false-negative exceptions. [ruby-dev:41778]
-
-	* configure.in: ditto.
-Tue Jul  6 22:57:21 2010  Tanaka Akira  <akr@fsij.org>
-
-	* io.c (nogvl_copy_stream_sendfile): jump to retry_sendfile directly
-	  to avoid select() on a socket which TCP state is CLOSED.
-	  patch by Eric Wong.  [ruby-core:31053]
-
-Tue Jul  6 21:45:34 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* io/console/console.c (winsize_row): should return actual screen
-	  size, not buffer size.
-
-Tue Jul  6 08:35:58 2010  Aaron Patterson <aaron@tenderlovemaking.com>
-
-	* ext/dl/lib/dl/import.rb (handler): add a more helpful error message
-	  when calling import_symbol or import_function without calling
-	  dlload.  Thanks nobu! [ruby-core:30996]
-
-Tue Jul  6 00:34:50 2010  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* vm.c (thread_free): free altstack to prevent memory leak.  a patch
-	  from Tomoyuki Chikanaga in [ruby-dev:41815]. [Bug #3537]
-
-Tue Jul  6 00:29:27 2010  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* string.c (NONASCII_MASK): NONASCII_MASK must be unsigned.
-	  [ruby-dev:41782]
-
-Mon Jul  5 16:05:39 2010  Akinori MUSHA  <knu@iDaemons.org>
-
-	* vm_method.c (rb_method_boundp): Return false for protected
-	  methods when called from Kernel#respond_to?. [ruby-dev:40461]
-
-Mon Jul  5 12:32:01 2010  Aaron Patterson <aaron@tenderlovemaking.com>
-
-	* ext/psych/lib/psych/scalar_scanner.rb (parse_string): support
-	  timezones that are not one hour off. [ruby-core:31023]
-
-	* ext/psych/lib/psych/visitors/yaml_tree.rb: ditto
-
-Sun Jul  4 22:49:54 2010  Tanaka Akira  <akr@fsij.org>
-
-	* test/ruby/test_syntax.rb: split test_syntax from test_system.rb.
-
-Sun Jul  4 22:02:02 2010  Tanaka Akira  <akr@fsij.org>
-
-	* test/ruby/test_system.rb (test_syntax): unified with test_syntax2.
-
-Sun Jul  4 21:00:39 2010  Tanaka Akira  <akr@fsij.org>
-
-	* test/ruby/test_system.rb (test_syntax2): moved from sample/test.rb
-	  [ruby-dev:41721]
-
-Sun Jul  4 17:13:14 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* io.c (swallow, prepare_getline_args, rb_io_getline_1): fix for
-	  paragraph mode reading in non-ascii-compatible encoding.
-	  [ruby-dev:41803]
-
-Sat Jul  3 16:14:10 2010  Kenta Murata  <mrkn@mrkn.jp>
-
-	* ext/bigdecimal/bigdecimal.c (Init_bigdecimal): add two new constants
-	  BigDecimal::INFINITY and BigDecimal::NAN.
-
-	* ext/bigdecimal/lib/bigdecimal/math.rb (BigMath.exp): modify the
-	  behaviors for infinity arguments as same as Math.exp.
-
-Sat Jul  3 09:47:26 2010  Aaron Patterson  <aaron@tenderlovemaking.com>
-
-	* ext/psych/lib/psych/visitors/to_ruby.rb(visit_Psych_Nodes_Scalar):
-	  teaching Psych to deserialize DateTime objects. [Bug #1390]
-
-	* ext/psych/lib/psych/visitors/yaml_tree.rb(visit_DateTime): added a
-	  method for serializing DateTime objects.
-
-	* ext/psych/lib/psych/scalar_scanner.rb(parse_time): add method for
-	  parsing times objects from a string.
-
-	* test/psych/test_date_time.rb: tests for dumping DateTime objects.
-
-Sat Jul  3 09:13:55 2010  Aaron Patterson  <aaron@tenderlovemaking.com>
-
-	* ext/psych/lib/psych/visitors/yaml_tree.rb (visit_Time): use
-	  Time#nsec to accurately serialize time objects. [ruby-core:29233]
-
-Fri Jul  2 23:30:23 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* io.c (argf_inplace_mode_set): prohibits an assignment of a tainted
-	  value.
-
-	* file.c (ruby_find_basename, ruby_find_extname): split from
-	  rb_file_s_basename() and rb_file_s_extname().
-
-	* util.c (ruby_add_suffix): support arbitrary length of the suffix
-	  to get rid of the potential buffer overflow.
-	  reported by tarui.
-
-Fri Jul  2 05:31:51 2010  Tanaka Akira  <akr@fsij.org>
-
-	* numeric.c (rb_num2long): accept LONG_MAX < x < LONG_MAX+1 and
-	  LONG_MIN-1 < x < LONG_MIN as well because they are converted
-	  into the valid range of long by truncation.
-	  (rb_num2ulong): accept ULONG_MAX < x < ULONG_MAX+1 and
-	  LONG_MIN-1 < x < LONG_MIN as well.
-	  (rb_num2ll): accept LLONG_MAX < x < LLONG_MAX+1 and
-	  LLONG_MIN-1 < x < LLONG_MIN.
-
-Thu Jul  1 23:10:25 2010  James Edward Gray II  <jeg2@ruby-lang.org>
-
-	* lib/csv.rb: Improving documentation.
-
-Thu Jul  1 22:15:01 2010  Tanaka Akira  <akr@fsij.org>
-
-	* numeric.c (rb_num2ulong): fix the lower limit for float.
-	  [ruby-dev:41361]
-
-Thu Jul  1 21:37:11 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* test/ruby/envutil.rb (EnvUtil#invoke_ruby): integrated with
-	  runexec.
-
-Thu Jul  1 16:19:53 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* thread_pthread.c (thread_start_func_1): don't call
-	  native_thread_init_stack(th) on cygwin to avoid the segv
-	  introduced by r27789. Cygwin's signal implementation is half
-	  baked so USE_SIGNALSTACK is not defined and it needs another
-	  treatment.
-
-Thu Jul  1 13:00:54 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* common.mk (test-knownbug): ignore known bugs.
-
-Thu Jul  1 08:40:26 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* marshal.c (w_object): suppress empty instance variable entry on
-	  compatible dump objects.
-
-Wed Jun 30 07:29:11 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* test/ruby/test_rubyoptions.rb (test_script_from_stdin): by using
-	  a pipe, get rid of not-well-defined behavior after the child
-	  process terminated in pty.
-
-Wed Jun 30 02:30:26 2010  Yutaka Kanemoto  <kanemoto@ruby-lang.org>
-
-	* thread_pthread.c (get_stack): use pthread_getthrds_np() for AIX.
-
-	* configure.in: ditto.
-
-Tue Jun 29 21:11:15 2010  Masaya Tarui  <tarui@ruby-lnag.org>
-
-	* ext/stringio/stringio.c (strio_write): add RB_GC_GUARD.
-
-Tue Jun 29 19:39:59 2010  Masaki Suketa <masaki.suketa@nifty.ne.jp>
-
-	* test/win32ole/test_win32ole_method.rb (is_ruby64): check
-	  ruby binary is mswin64 or mingw64. [ruby-dev:41756]
-
-Tue Jun 29 14:18:21 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* file.c (rb_realpath_internal, realpath_rec): skip UNC share root
-	  on DOSISH platforms.
-	  http://pc12.2ch.net/test/read.cgi/tech/1272248179/600
-
-Tue Jun 29 11:52:33 2010  Narihiro Nakamura  <authorNari@gmail.com>
-
-	* gc.c (unlink_heap_slot, slot_sweep): unlink heaps_slot of
-	  heaps_slot linked list if heaps_slot is empty at slot_sweep.
-	  fixed [ruby-dev:41543], [ruby-core:24894].
-
-Tue Jun 29 01:22:08 2010  Aaron Patterson <aaron@tenderlovemaking.com>
-
-	* ext/fiddle/fiddle.h: added FFI type detection to avoid bug in ffi
-	  header files. Thanks Yugui! [ruby-core:30917]
-
-Mon Jun 28 22:14:22 2010  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* test/rdoc/test_rdoc_ri_driver.rb (TestRDocRIDriver#test_formatter):
-	  fix a test accordingly to r28455.
-
-Mon Jun 28 21:56:14 2010  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* thread.c (rb_fd_resize, rb_fd_copy): avoid NULL dereference upon
-	  failed realloc by using xrealloc instead of not realloc.  a patch
-	  from Jim Meyering <meyering at redhat.com> in [ruby-core:30920]
-	  [Bug #3489]
-
-Mon Jun 28 20:32:33 2010  Masaki Suketa <masaki.suketa@nifty.ne.jp>
-
-	* test/win32ole/test_win32ole_method.rb (test_offset_vtbl): check
-	  that Ruby is 32bit or 64bit binary in order to get correct offset
-	  value. [ruby-dev:41741]
-
-Mon Jun 28 05:32:51 2010  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* lib/rdoc/ri/driver.rb (RDoc::RI::Driver#formatter): should use bs
-	  format when stdout is piped.  [ruby-core:30734]
-
-Mon Jun 28 03:12:03 2010  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* bootstraptest/test_class.rb: add a test for [ruby-core:30843].
-
-Mon Jun 28 02:43:35 2010  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* class.c (rb_mod_init_copy): when class is dup'ed, a metaclass of the
-	  class should be attached to the dup'ed class, not the original
-	  class.  [ruby-core:30843] [Bug #3461]
-
-Sun Jun 27 23:31:17 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* include/ruby/io.h, io.c: reverted r21709.
-
-	* ruby.c (load_file_internal): nothing to read if EOF reached
-	  while reading shebang.  [ruby-core:30910]
-
-Sun Jun 27 13:25:07 2010  Tanaka Akira  <akr@fsij.org>
-
-	* io.c (simple_sendfile): don't try to send data more than SSIZE_MAX
-	  with single sendfile call..
-	  based on the patch by Eric Wong.  [ruby-core:30908]
-
-Sun Jun 27 10:41:38 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* lib/rubygems/require_paths_builder.rb (write_require_paths_file_if_needed):
-	  no reason that bin directory should be included in $LOAD_PATH.
-	  it is for executable files, but not libraries.  [ruby-core:25936]
-
-Sat Jun 26 13:07:09 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* configure.in (enable-debug-env): option for RUBY_DEBUG env.
-
-Sat Jun 26 11:56:31 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* common.mk (clear-installed-list): put redirection before set
-	  command, since it seems to be handled by nmake in special way.
-	  [ruby-dev:41711]
-
-Sat Jun 26 10:08:36 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* test/ruby/envutil.rb (EnvUtil#invoke_ruby): no needs to copy the
-	  original ENV, since it's done in spawn automatically.
-	  [ruby-dev:41733]
-
-Sat Jun 26 08:44:22 2010  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* NEWS (zlib): new methods.  [ruby-dev:41706] [Bug #3472]
-
-Sat Jun 26 07:59:18 2010  Masaki Suketa <masaki.suketa@nifty.ne.jp>
-
-	* test/win32ole/test_win32ole_method.rb (test_offset_vtbl): check
-	  that OS is Windows 32bit or Windows 64bit in order to get
-	  correct offset value.
-
-Sat Jun 26 04:39:12 2010  Masaya Tarui  <tarui@ruby-lnag.org>
-
-	* ext/dl/lib/dl/func.rb (call): don't overwrite original arguments
-	  to defend from GC.
-	* test/dl/test_func.rb (test_string): add test for above.
-
-Fri Jun 25 11:45:36 2010  James Edward Gray II  <jeg2@ruby-lang.org>
-
-	* lib/csv.rb: Fixing a bug that prevented CSV from parsing
-	  all multi-line fields correctly.  Patch by Rob Biedenharn.
-
-Fri Jun 25 10:07:14 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* test/ruby/envutil.rb (Test::Unit::Assertions#assert_in_out_err):
-	  return the exit status.
-
-	* test/ruby/envutil.rb (EnvUtil#invoke_ruby): change the
-	  environment of spawned process only.
-
-	* test/ruby/envutil.rb (EnvUtil#invoke_ruby): get rid of possible
-	  deadlock.
-
-Fri Jun 25 06:24:25 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* lib/un.rb (httpd): MaxClients also should be integer.
-	  [ruby-dev:41724] [Bug #3477]
-
-	* lib/un.rb (setup): fix of word splitting.  [ruby-dev:41723]
-	  [Bug #3476]
-
-Fri Jun 25 01:07:17 2010  Masaya Tarui  <tarui@ruby-lnag.org>
-
-	* include/ruby/ruby.h (static inline rb_gc_guarded_ptr): prevent
-	  RB_GC_GUARD_PTR being removed by optimization.
-
-Thu Jun 24 06:22:27 2010  Tanaka Akira  <akr@fsij.org>
-
-	* ext/socket/raddrinfo.c (ruby_getaddrinfo__darwin): the workaround
-	  for Mac OS X moved from rsock_getaddrinfo.
-
-Thu Jun 24 05:44:27 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* marshal.c (struct dump_arg, struct load_arg): merge taint and
-	  untrust flags into infection as bit flags.
-
-	* marshal.c (w_nbyte, clear_dump_arg): infect the buffer as soon
-	  as appending, because it might have been finalized already at
-	  exit.  based on a patch by Tomoyuki Chikanaga
-	  at [ruby-dev:41672].  [Bug #3463]
-
-Wed Jun 23 23:49:21 2010  Tanaka Akira  <akr@fsij.org>
-
-	* ext/socket/raddrinfo.c (str_is_number): renamed from str_isnumber to
-	  avoid confusion to str_isnumber in ext/socket/getaddrinfo.c.
-
-Wed Jun 23 23:45:31 2010  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* NEWS (stringio): new methods.  [ruby-dev:41687] [Bug #3469]
-
-Wed Jun 23 22:52:00 2010  Tanaka Akira  <akr@fsij.org>
-
-	* ext/socket/raddrinfo.c: don't use __P.
-
-Wed Jun 23 21:32:08 2010  Masaki Suketa <masaki.suketa@nifty.ne.jp>
-
-	* ext/win32ole/win32ole.c (reg_get_typelib_file_path): try win64
-	  registry entry at first. [ruby-dev:41674] [Bug #3464]
-
-Wed Jun 23 21:17:32 2010  Tanaka Akira  <akr@fsij.org>
-
-	* ext/socket/raddrinfo.c (ruby_getaddrinfo__darwin): new workaround for
-	  getaddrinfo problem on Mac OS X Snow Leopard.  [ruby-core:29427]
-	  patch by Wataru Kimura.  [ruby-core:30842]
-
-Wed Jun 23 17:12:27 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* NEWS (ptr): new method and deprecated methods.  [ruby-dev:41681]
-
-	* ext/pty/{README,README.ja}: ditto.
-
-	* ext/pty/pty.c (pty_check): add rdoc.
-
-Wed Jun 23 12:44:47 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* test/ruby/test_regexp.rb (test_dup_warn): read in UTF-8
-	  encoding regardless environment.
-
-	* test/ruby/envutil.rb (invoke_ruby): add encoding option.
-
-Wed Jun 23 06:44:05 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* configure.in (fchown): need to check.  a patch by Eric Wong
-	  at [ruby-core:30818].
-
-	* io.c (argf_next_argv): check for setting owner/group.
-
-Tue Jun 22 23:10:10 2010  Tanaka Akira  <akr@fsij.org>
-
-	* time.c (num_exact): fix for mathn.  [ruby-dev:41599]
-
-Tue Jun 22 22:00:06 2010  Tanaka Akira  <akr@fsij.org>
-
-	* ext/socket/lib/socket.rb: suppress warnings.
-
-Tue Jun 22 21:33:23 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* test/optparse/test_summary.rb: fixed superclass so that it run
-	  solely.
-
-Tue Jun 22 19:57:33 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* parse.y (shadowing_lvar_gen): should add lvar to vars and
-	  used.  [ruby-dev:41666]
-
-Tue Jun 22 13:23:13 2010  Marc-Andre Lafortune  <ruby-core@marc-andre.ca>
-
-	* lib/delegate.rb: Forward #trust, #untrust, #taint and #untaint
-	  to both the delegator and __getobj__ [ruby-core:26138]
-
-Mon Jun 21 23:41:08 2010  wanabe  <s.wanabe@gmail.com>
-
-	* eval_error.c (error_print): clear raised_flag while error-printing
-	  to avoid hang. [ruby-core:27608]
-
-	* test/ruby/test_beginendblock.rb (test_endblock_raise): add test for
-	  above.
-
-Sun Jun 20 16:17:24 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* id.c (Init_id): add underscore name.
-
-	* parse.y (warn_unused_var): ignore underscore name.
-
-	* parse.y (warn_unused_var): use same format as shadowing local
-	  variable.
-
-	* parse.y (shadowing_lvar_gen): get rid of adding extra name for
-	  shadowing local variable.  [ruby-dev:41628]
-
-Sat Jun 19 11:11:37 2010  Yukihiro Matsumoto  <matz@ruby-lang.org>
-
-	* lib/irb.rb: remove double exclamation marks.  a patch from Diego
-	  Viola.  [ruby-core:30589]
-
-Sat Jun 19 03:35:58 2010  Aaron Patterson <aaron@tenderlovemaking.com>
-
-	* ext/psych/lib/psych/visitors/to_ruby.rb (resolve_klass): fix the
-	  exception message when attempting to load an unknown class.  Thanks
-	  nobu! [ruby-dev:41399]
-
-	* test/psych/test_psych.rb: test for the exception message
-
-Fri Jun 18 10:37:46 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* gc.c (gc_lazy_sweep): clean a warning.
-	  "suggest parentheses around assignment used as truth value"
-
-	* transcode_data.h (getGB4bt1): clean a warning.
-	  "suggest parentheses around arithmetic in operand of |"
-
-	* transcode_data.h (getGB4bt3): ditto.
-
-	* vm.c (thread_free): clean a warning. "format 'p' expects type
-	  'void *', but argument 3 has type 'struct rb_mutex_struct *'"
-
-Fri Jun 18 10:15:12 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* ruby.c: add prototype of rb_realpath_internal.
-
-	* load.c: ditto.
-
-Fri Jun 18 01:50:21 2010  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* object.c: Object#public_methods, private_methods, etc. returns
-	  method ids that belong to the class or the singleton class(es) of
-	  the object.  [ruby-dev:41613]
-
-	* class.c: on the other hand, Module#public_instance_methods, etc.
-	  returns method ids that belong to the module itself (even if the
-	  module is singleton, it does not return method ids of super
-	  class(es); see [ruby-core:28837]).
-
-Fri Jun 18 01:22:55 2010  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* lib/webrick/httpservlet/filehandler.rb
-	  (prevent_directory_traversal): apply filesystem encoding to path
-	  only during calling File.expand_path.  [ruby-dev:41423]
-
-Thu Jun 17 23:20:14 2010  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* load.c (rb_load_internal): remove call to rb_realpath_internal
-	  within rb_load_internal which caused big performance degradation.
-	  Instead, call rb_realpath_internal in the caller of
-	  rb_load_internal.  [ruby-dev:41502] [ruby-dev:41610]
-
-	* vm.c (rb_vm_call_cfunc): ditto.
-
-	* eval_intern.h (rb_vm_call_cfunc): ditto.
-
-	* ruby.c (process_options): ditto.
-
-Thu Jun 17 18:37:47 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* file.c (rb_str_encode_ospath): when the encoding of the parameter
-	  is ASCII-8BIT, should recognize as filesystem encoding, and convert
-	  to UTF-8 on Windows.
-
-	* file.c (realpath_rec): should convert to ospath encoding before
-	  calling lstat().
-
-	* file.c (rb_realpath_internal): resolved string should take over
-	  the encoding of base string.
-
-	* transcode.c (rb_str_encode): should return new string always.
-	  fixed #3444.
-
-Wed Jun 16 18:34:54 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* parse.y: ripper needs warn_unused_var(), too.
-
-Wed Jun 16 18:20:00 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* parse.y (warn_unused_var): warn unused variables.
-	  [ruby-dev:41620]
-
-Wed Jun 16 15:40:53 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* error.c (rb_bug): existence of _set_abort_behavior() depends on
-	  runtime version, not compiler version.
-
-Wed Jun 16 01:38:40 2010  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* ext/fiddle/extconf.rb: check ffi.h even when pkg-config succeeded.
-	  On Debian/lenny, which is a "supported" platform, ffi.h is installed
-	  in /usr/include/i486-linux-gnu/.  This causes build error when using
-	  gcc whose target is not i486-linux-gnu.
-
-Wed Jun 16 00:04:38 2010  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* test/ruby/test_io.rb (safe_4): does not use Timeout because
-	  Timeout.timeout uses Thread#kill which raises SecurityError when
-	  $SAFE == 4.  based on a patch from Tomoyuki Chikanaga.
-	  [ruby-dev:41484]
-
-	* test/ruby/test_io.rb (test_print_separators): use pipe (test helper
-	  method) instead of IO.pipe.  [ruby-dev:41484]
-
-Tue Jun 15 17:14:58 2010  WATANABE Hirofumi  <eban@ruby-lang.org>
-
-	* ext/fiddle/extconf.rb: De Morgan's laws.
-
-Tue Jun 15 12:09:00 2010  WATANABE Hirofumi  <eban@ruby-lang.org>
-
-	* ext/fiddle/extconf.rb: use pkg_config to find ffi.h.
-
-Tue Jun 15 02:31:27 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* Makefile.in, common.mk (clean-ext, clean-enc): clean up cleaning
-	  targets.
-
-Mon Jun 14 22:36:09 2010  Tanaka Akira  <akr@fsij.org>
-
-	* test/socket/test_socket.rb (test_udp_server): rescue Errno::ENOSYS
-	  for Windows.
-
-	* test/socket/test_nonblock.rb (test_sendmsg_nonblock_error): ditto.
-
-	  [ruby-dev:41597] reported by Masaya Tarui.
-
-Mon Jun 14 17:44:39 2010  Masatoshi SEKI  <m_seki@mva.biglobe.ne.jp>
-
-	* lib/drb/drb.rb: raise DRbConnError instead of ArgumentError if too
-	  many arguments. [ruby-dev:41481]
-
-	* test/drb/test_drb.rb: ditto.
-
-	* test/drb/drbtest.rb: ditto.
-
-Mon Jun 14 04:03:55 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* ext/fiddle/closure.c (dealloc): refix workaround r28300.
-	  don't use ffi_closure_alloc, ffi_prep_closure_loc and
-	  ffi_closure_free on MACOSX and __linux__.
-	  [ruby-dev:41483] [ruby-dev:41214]
-
-Sun Jun 13 15:46:07 2010  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* test/ruby/test_rubyoptions.rb: add a simple test for __END__ and
-	  DATA.
-
-Sun Jun 13 04:24:18 2010  Marc-Andre Lafortune  <ruby-core@marc-andre.ca>
-
-	* lib/delegate.rb: Delegate !=, eql? and hash [ruby-core:26139]
-
-Sun Jun 13 02:12:46 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* enc/trans/utf8_mac.trans (buf_apply): fix for patterns
-	  whose result is 2 bytes. [ruby-core:30751]
-
-Sun Jun 13 01:38:17 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* time.c (rb_localtime_r2): fix mixed declarations and code.
-
-Sun Jun 13 00:27:24 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* ext/dl/lib/dl.rb: don't require when already loaded.
-
-Sun Jun 13 00:02:56 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* ext/fiddle/closure.c (dealloc): workaround fix for libffi's
-	  ffi_closure_free. [ruby-dev:41483] [ruby-dev:41214]
-
-Sat Jun 12 10:02:26 2010  Yukihiro Matsumoto  <matz@ruby-lang.org>
-
-	* io.c (rb_f_syscall): should check argument string taint before
-	  invoking system calls.
-
-Sat Jun 12 09:18:31 2010  Yukihiro Matsumoto  <matz@ruby-lang.org>
-
-	* variable.c (uninitialized_constant): process through
-	  rb_class_real() to remove "Object::" from error message.
-	  [ruby-dev:40951]
-
-Sat Jun 12 00:38:37 2010  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* ext/dbm/extconf.rb: accept Berkley DB version 3, 4 and 5.
-	  a patch from Takahiro Kambe.  [ruby-dev:41531]
-
-Fri Jun 11 23:21:35 2010  Tanaka Akira  <akr@fsij.org>
-
-	* time.c (init_leap_second_info): check the result of
-	  gmtime_with_leapsecond.
-
-Fri Jun 11 23:04:59 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* ext/openssl/ossl_ssl.c (ossl_sslctx_get_ciphers):
-	  use sk_SSL_CIPHER_num and sk_SSL_CIPHER_value instead of cast.
-	  patched by Takahiro Kambe [ruby-dev:41530]
-
-Fri Jun 11 22:59:31 2010  Tanaka Akira  <akr@fsij.org>
-
-	* include/ruby/missing.h (isnan): fix compilation error on OpenBSD.
-
-Fri Jun 11 22:39:50 2010  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* lib/rubygems/install_update_options.rb
-	  (Gem::InstallUpdateOptions#add_install_update_options): deprecate
-	  --test option which has not worked.  [ruby-core:21714]
-
-	* test/rubygems/test_gem_command_manager.rb: ditto.
-
-Fri Jun 11 07:34:25 2010  Tanaka Akira  <akr@fsij.org>
-
-	* time.c (find_time_t): test the result of LOCALTIME.
-
-Fri Jun 11 00:42:45 2010  Tanaka Akira  <akr@fsij.org>
-
-	* time.c (rb_localtime_r2): fix localtime overflow check.
-
-Thu Jun 10 23:05:44 2010  Tanaka Akira  <akr@fsij.org>
-
-	* time.c (rb_localtime_r2): refine localtime overflow check for
-	  FreeBSD 6.4.
-
-Thu Jun 10 09:10:08 2010  Yukihiro Matsumoto  <matz@ruby-lang.org>
-
-	* io.c (rb_io_putc): documentation updated to mention putc would
-	  not work well with multi-byte characters.  [ruby-core:30697]
-
-	* io.c (rb_f_putc): ditto.
-
-Wed Jun  9 22:51:50 2010  Tanaka Akira  <akr@fsij.org>
-
-	* time.c (find_time_t): always extrapolate from past.
-	  [ruby-core:30672] reported by Benoit Daloze.
-
-Wed Jun  9 22:13:08 2010  Tanaka Akira  <akr@fsij.org>
-
-	* time.c (calc_tm_yday): extracted from timegmw_noleapsecond.
-
-Tue Jun  8 06:27:09 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* gem_prelude.rb: load full rubygems at LoadError for activation
-	  check.  [ruby-core:29486]
-
-Tue Jun  8 06:04:49 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* io.c (parse_mode_enc): set set_by_bom bit.  [ruby-core:30641]
-
-Sun Jun  6 22:37:11 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* string.c (rb_str_buf_cat_escaped_char): get rid of buffer
-	  overflow on platforms int is bigger than 32bit, and warnings.
-
-Sun Jun  6 19:55:21 2010  Tanaka Akira  <akr@fsij.org>
-
-	* array.c (rb_ary_product): clear uninitialized elements in temporary
-	  array.
-
-Sun Jun  6 12:31:57 2010  Narihiro Nakamura  <authorNari@gmail.com>
-
-	* gc.c: set_heaps_increment is not
-	  called before gc_marks of lazy sweeping because live_num not
-	  contain finalize objects. So call set_heaps_increment after lazy
-	  sweeping if free_num are not enough. And move free_min to struct
-	  rb_objspace for above.  [ruby-dev:41499]
-
-Sun Jun  6 10:44:34 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* array.c (rb_ary_product): need to set the length in order to get
-	  the entries marked.  [ruby-dev:41540]
-
-Sun Jun  6 08:26:01 2010  Tanaka Akira  <akr@fsij.org>
-
-	* vm.c (Init_BareVM): call Init_native_thread here.
-
-	* thread.c (Init_Thread): don't call Init_native_thread.
-
-	* thread_pthread.c (Init_native_thread): exported.
-
-	* thread_win32.c (Init_native_thread): ditto.
-
-	[ruby-dev:41536]
-
-Sun Jun  6 08:21:17 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* NEWS: Enumerable#join has been reverted.  [ruby-core:30604]
-
-Sat Jun  5 20:30:49 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* re.c (rb_reg_expr_str): ASCII incompatible strings
-	  must always escape or converted.
-
-	* re.c (rb_reg_expr_str): use rb_str_buf_cat_escaped_char
-	  when resenc is given: for Regexp#inspect or error message.
-
-	* re.c (rb_reg_desc): add 'n' for ENCODING_NONE.
-
-Sat Jun  5 01:20:14 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* string.c (sym_inspect): Escape when the symbol is not
-	  resulted encoding and not ascii_only. It had escaped
-	  ascii-incompatible string, but it is wrong.
-
-Sat Jun  5 01:10:12 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* string.c (rb_str_buf_cat_escaped_char): defined.
-	  Splited from rb_str_inspect.
-
-Sat Jun  5 16:39:13 2010  Tanaka Akira  <akr@fsij.org>
-
-	* .gdbinit (rp): show type name for RTypedData.
-
-Sat Jun  5 15:59:08 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* ruby.c (process_options, load_file_internal): $0 seen from
-	  required libraries by -r option should be the main script.
-	  [ruby-core:23717]
-
-Sat Jun  5 15:15:52 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* test/ruby/envutil.rb (EnvUtil#invoke_ruby): support for child
-	  process env.
-
-Sat Jun  5 14:11:11 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* test/net/imap/test_imap.rb (test_exception_during_shutdown):
-	  need to raise always.
-
-Sat Jun  5 13:13:30 2010  Marc-Andre Lafortune  <ruby-core@marc-andre.ca>
-
-	* lib/matrix.rb (eql?, ==, minor): Fix bugs when comparing/returning
-	  some empty matrices.
-
-Sat Jun  5 11:00:48 2010  Tanaka Akira  <akr@fsij.org>
-
-	* error.c (rb_name_err_mesg_new): guard mesg, recv and method.
-	  The problem in [ruby-dev:41464] is caused because mesg is collected.
-
-Sat Jun  5 10:03:31 2010  Tanaka Akira  <akr@fsij.org>
-
-	* .gdbinit (rp): detect and show RTypedData.
-
-Sat Jun  5 08:30:42 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* file.c (rb_f_test): 'W' should test writable by real uid/git,
-	  not world writable.   [ruby-core:30587]
-
-Sat Jun  5 06:20:57 2010  Eric Hodel  <drbrain@segment7.net>
-
-	* dir.c: Clarification of what '*' matches.  Patch by John Wells
-	  <john.wells at greatworx.com>
-
-Fri Jun  4 10:46:33 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* ext/dl/cfunc.c (rb_dlcfunc_inspect): should taint the result.
-	  [ruby-dev:41533]
-
-Fri Jun  4 09:37:15 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* gc.c (gc_sweep): suppress a warning on VC, again.
-
-Thu Jun  3 23:34:55 2010  Akinori MUSHA  <knu@iDaemons.org>
-
-	* ext/digest/lib/digest/hmac.rb: Emit a deprecation warning in
-	  verbose mode and add a caution to the overview section of the
-	  document. [ruby-dev:41525]
-
-Thu Jun  3 19:33:51 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* ext/dl/cfunc.c (rb_dlcfunc_inspect): suppress warnings by
-	  rb_sprintf.
-
-	* ext/dl/cptr.c (rb_dlptr_s_malloc): suppress warnings.
-
-Thu Jun  3 18:58:28 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* load.c (ruby_init_ext): statically linked extensions have no
-	  real path.  [ruby-dev:41526]
-
-	* vm.c (rb_vm_call_cfunc): add filepath argument.
-
-Thu Jun  3 18:17:45 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* test/rake/test_win32.rb (Rake::TestWin32): update tests.
-	  [ruby-core:30309]
-
-	* test/io/nonblock/test_flush.rb (test_flush): try pipe and
-	  socketpair.  [ruby-dev:41517]
-
-Thu Jun  3 09:36:43 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* ext/dl/dl.h (DLSTACK_TYPE): type of stack is same as VALUE.
-	  reported by sakiyama shin in [ruby-dev:41514]
-
-Thu Jun  3 06:30:20 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* test/ruby/test_path.rb (test_path): workaround for drive
-	  letter.
-
-	* test/ruby/test_path.rb (test_path): get rid of blocking on
-	  access to non-existent host.
-
-Thu Jun  3 05:37:46 2010  Ryan Davis  <ryand-ruby@zenspider.com>
-
-	* tool/rbinstall.rb (install-bin): Allow bin/* install from dot-dirs.
-	  Fixes rvm and multiruby installations.
-
-Thu Jun  3 01:22:45 2010  Hidetoshi NAGAI  <nagai@ai.kyutech.ac.jp>
-
-	* ext/tk/lib/tk.rb: fix typo and race condition.
-
-Thu Jun  3 00:58:45 2010  Aaron Patterson <aaron@tenderlovemaking.com>
-
-	* ext/dl/lib/dl/cparser.rb (parse_ctype): add backwards compatibility
-	  by supporting "uint" types in the c parser. [ruby-core:29750]
-	* test/dl/test_cparser.rb: adding a test for "uint" changes.
-
-Wed Jun  2 11:40:02 2010  Yukihiro Matsumoto  <matz@ruby-lang.org>
-
-	* compile.c (iseq_compile_each): should consider block on stack,
-	  if block argument is passed.  [ruby-core:30534]
-
-	* parse.c (arg_concat_gen): should append to nd_head, not to
-	  nd_iter for NODE_BLOCK_PASS.
-
-Tue Jun  1 23:12:06 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* re.c (unescape_nonascii): \P{FOO} is also Unicode property in
-	  regexp. [ruby-core:30540]
-
-Tue Jun  1 21:29:39 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* lib/net/http.rb: adding support to rfc5789 patch verb.
-	  Added a Net::HTTP::Patch class which expects a message body
-	  and response body. It recycles the post method into a patch one,
-	  that will send the encoded representation to the server.
-	  Summarizing, a new class has been created, the post method
-	  extracted into send_entity, including a new argument,
-	  which defines which class to use (Post or Patch) and
-	  finally a patch method was created. [ruby-core:30426]
-	  Patched by Guilherme Silveira
-	  <guilherme.silveira AT caelum.com.br>
-
-Tue Jun  1 03:46:08 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* ext/readline/extconf.rb: reject GPLv3 readline. [ruby-dev:39172]
-	  [ruby-core:25272] [ruby-dev:39167] [ruby-core:28736]
-
-Tue Jun  1 01:14:31 2010  Masaya Tarui  <tarui@ruby-lnag.org>
-
-	* io.c (pipe_open): add RB_GC_GUARD.
-	  This caused failure when test/ruby/test_argf.rb is executed with
-	  GC.stress = true in mswin32_90
-
-Mon May 31 23:44:22 2010  Hidetoshi NAGAI  <nagai@ai.kyutech.ac.jp>
-
-	* ext/tk/extconf.rb: use tclConfig.sh/tkConfig.sh when frameworks
-	  are enabled on MacOS X.
-
-	* ext/tk/stubs.c: dirty hack for frameworks and stubs on MacOS X.
-
-	* ext/tk/lib/tk.rb: stop creating a dummy Tcl/Tk interpreter.
-	  And hide a root window before starting eventloop. (for ruby 1.9)
-
-	* ext/tk/tcltklib.c: add codes to support Ruby/Tk-Kit (Rubykit).
-
-Mon May 31 21:49:42 2010  Tanaka Akira  <akr@fsij.org>
-
-	* lib/resolv.rb (Resolv::DNS::Requester#request): rescue ECONNRESET
-	  for Windows.  reported by U.Nakamura.  [ruby-dev:41477]
-
-Mon May 31 19:25:58 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* regparse.c (onig_syntax_warn): do not use external strings as
-	  printf format.
-
-Mon May 31 18:22:23 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* misc/ruby-mode.el (ruby-mode-set-encoding): skip shebang line
-	  always regardless of ruby.
-
-Mon May 31 15:07:18 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* file.c (file_expand_path): Refix r28102: this breaks
-	  r28039. test for [ruby-dev:41429] is added. [ruby-core:30516]
-
-Mon May 31 14:47:09 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* string.c (rb_str_inspect): inspect as ASCII when the codepoint
-	  of a character in Unicode string is ASCII printable one.
-
-Mon May 31 13:44:40 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* encoding.c (rb_enc_unicode_p): check the encoding is Unicode
-	  or not by the name; not function's pointer. [ruby-dev:41479]
-
-Mon May 31 04:03:43 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* file.c (file_expand_path): check if expanded dname encoding is
-	  compatible with fname, not just copying.  [ruby-core:30516]
-
-	* test/ruby/test_beginendblock.rb (test_endblockwarn): needs
-	  encoding comment.
-
-Mon May 31 02:17:54 2010  Yukihiro Matsumoto  <matz@ruby-lang.org>
-
-	* insns.def (defined): respond_to_missing? may not be available
-	  (for BasicObject instances).
-
-Mon May 31 01:43:42 2010  Marc-Andre Lafortune  <ruby-core@marc-andre.ca>
-
-	* lib/delegate: Delegator: combine (public|protected) methods with
-	  those of the delegated object. [ruby-core:27224]
-	  DelegateClass: combine (public|protected) instance methods
-	  with those of the delegated superclass.
-
-Sun May 30 22:18:49 2010  Marc-Andre Lafortune  <ruby-core@marc-andre.ca>
-
-	* lib/set.rb (keep_if, select!): New methods [ruby-core:29749]
-
-Sun May 30 21:51:59 2010  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* test/rake/test_application.rb: update a test because of r28089.
-
-Sun May 30 21:48:07 2010  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* lib/tempfile.rb (Tempfile#unlink): leave @data.  Assigning nil to
-	  @data caused double closing error of the same IO in finalizer.  a
-	  patch from Simon Nicholls.  [ruby-core:29395]
-
-Sun May 30 18:47:15 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* ext/nkf/nkf-utf8/nkf.c: updated to b856dd07.
-	  this cleans warnings.
-
-Sun May 30 18:25:55 2010  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* load.c (load_failed): use more accurate error message.
-	  [ruby-core:23851]
-
-Sun May 30 16:54:34 2010  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* file.c (rb_file_directory_p): update rdoc.  a patch from Ilkka
-	  Laukkanen.  [ruby-core:30016]
-
-Sun May 30 14:59:13 2010  Narihiro Nakamura  <authorNari@gmail.com>
-
-	* gc.c (gc_mark_all_clear): don't call obj_free() in
-	  gc_mark_all_clear(), because obj_free() may make T_ZOMBIE
-	  objects.
-
-	* gc.c (gc_clear_mark_on_sweep_slots): renamed.
-
-	* gc.c (rb_objspace_call_finalizer): call
-	  gc_clear_mark_on_sweep_slots() before calling mark_tbl().
-	  [ruby-dev:41459]
-
-Sun May 30 03:40:44 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* parse.y (parser_tokadd_utf8, parser_tokadd_string): allow NUL
-	  containing symbol literals, as well as String#to_sym.
-	  [ruby-dev:41447]
-
-Sun May 30 03:03:20 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* lib/rdoc/generator/template/darkfish/classpage.rhtml:
-	  fix encoding value of XML declaration. [ruby-dev:41452]
-
-Sun May 30 02:20:26 2010  Masaya Tarui  <tarui@ruby-lnag.org>
-
-	* thread.c (RB_GC_SAVE_MACHINE_CONTEXT), gc.c (ruby_gc_stress_start):
-	  revert r28078.
-
-Sun May 30 02:21:34 2010  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* ext/zlib/zlib.c (zstream_append_input2): add RB_GC_GUARD.
-	  This caused failure when test/csv is executed with GC.stress = true.
-
-Sun May 30 01:25:48 2010  Masaya Tarui  <tarui@ruby-lnag.org>
-
-	* thread.c (RB_GC_SAVE_MACHINE_CONTEXT): start GC
-	  by switching the thread if gc_stress == true
-
-	* gc.c (ruby_gc_stress_start): ditto.
-
-Sun May 30 00:02:39 2010  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* gc.c (force_chain_object, rb_objspace_call_finalizer): delete
-	  finalizer entry after corresponding finalizer is executed.
-	  This caused SEGV when test/cgi is executed with GC.stress = true.
-
-Sat May 29 23:30:33 2010  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* string.c (str_replace_shared): change embedded state atomically.
-	  [ruby-core:29953] [ruby-dev:41456]
-
-Sat May 29 12:56:09 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* encoding.c (rb_filesystem_encindex): avoid infinite require
-	  loop. [ruby-core:30467]
-
-Sat May 29 12:05:51 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* lib/rdoc/rdoc.rb (RDoc#read_file_contents): take care of BOM.
-	  [ruby-dev:41452]
-
-Sat May 29 10:12:36 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* gc.c (GC_PROF_TIMER_STOP): regularize `marked' to suppress
-	  warnings.
-
-Sat May 29 09:34:32 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* test/ruby/envutil.rb: fix for --disable-gems.
-
-Sat May 29 09:04:06 2010  Tanaka Akira  <akr@fsij.org>
-
-	* lib/resolv.rb (Resolv::DNS::Requester#request): rescue ECONNREFUSED.
-
-Sat May 29 08:46:29 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* gc.c (allocate_sorted_heaps, before_gc_sweep, gc_sweep): removed
-	  unused variables.
-
-Fri May 28 20:35:21 2010  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* thread.c (blocking_region_begin): avoid RUBY_VM_CHECK_INTS()
-	  call during GVL state transition. [Bug#3354] [ruby-dev:41435]
-
-Fri May 28 19:37:47 2010  Narihiro Nakamura  <authorNari@gmail.com>
-
-	* gc.c: use simple lazy sweep algorithm for response performance
-	  gain. See [ruby-dev:41067].
-
-	* object.c: FL_MARK of some objects by lazy sweep is copied when
-	  RVALUE is cloned. These objects are not marked in the mark phase.
-	  So delete FL_MARK.
-
-	* class.c: ditto.
-
-Fri May 28 18:39:38 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* string.c (sym_inspect): escape ASCII-compatible strings.
-
-	* string.c (rb_str_inspect): escape ASCII-compatible strings.
-
-Fri May 28 17:34:48 2010  URABE Shyouhei  <shyouhei@ruby-lang.org>
-
-	* array.c (rb_ary_product): Use tmpary instead, to ensure marking
-	  arrays by GC.
-
-Fri May 28 11:40:07 2010  URABE Shyouhei  <shyouhei@ruby-lang.org>
-
-	* array.c (rb_ary_product): Do not rely on GC, t0 should be
-	  checked explicitly.
-
-Fri May 28 10:40:37 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* lib/mkmf.rb (checking_for): ignore toplevel.
-
-Fri May 28 00:47:16 2010  Masaya Tarui  <tarui@ruby-lnag.org>
-
-	* error.c (rb_bug): suppress the error report dialog if report_bug()
-	  is finished successfully.
-
-Fri May 28 00:32:25 2010  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* insns.def (invokesuper): check consistency between class of self and
-	  class of method being invoked by super.  This is temporary measure
-	  for YARV.  See [ruby-core:30313] in detail.  See [ruby-dev:40959]
-	  [ruby-dev:39772] [ruby-core:27000] [ruby-core:27230]
-
-	* vm_insnhelper.c (vm_search_superclass): ditto.
-
-Thu May 27 23:38:31 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* file.c (rb_home_dir): set filesystem encoding.
-
-Thu May 27 23:29:18 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* file.c (file_expand_path): set encoding as the same of fname
-	  when _result_ is not filesystem encoding. [ruby-dev:41429]
-
-Thu May 27 23:07:45 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* file.c (file_expand_path): use rb_enc_associate_index and
-	  rb_filesystem_encindex. Strings related FileSystem should
-	  have filesystem_encoding.
-
-	* file.c (SET_EXTERNAL_ENCODING): removed.
-
-Thu May 27 23:03:19 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* include/ruby/encoding.h (rb_filesystem_encindex): defined.
-
-	* include/ruby/encoding.h (rb_locale_encindex): ditto.
-
-	* encoding.c (rb_filesystem_encindex): remove static.
-
-	* encoding.c (rb_locale_encindex): ditto.
-
-Thu May 27 22:34:27 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* win32/win32.c (rb_w32_read): call ReadFile() with len = 0 before
-	  reading really on console, because the first ReadFile() call after
-	  PeekConsoleInput() always returns broken data. (Windows's bug).
-	  [ruby-core:29018]
-
-Thu May 27 12:42:23 2010  Akinori MUSHA  <knu@iDaemons.org>
-
-	* LGPL: Removed.  We no longer have LGPL'd source files in our
-	  tree.
-
-Wed May 26 20:19:22 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* random.c (random_rand): add the result of random to the
-	  beginning of range, not the opposite.  [ruby-dev:41415]
-
-Wed May 26 19:55:33 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* file.c (file_expand_path): revert a part of r22392. it's commit miss.
-
-Wed May 26 18:40:23 2010  Masaya Tarui  <tarui@ruby-lang.org>
-
-	* test/rinda/test_rinda.rb (TupleSpaceTest, TupleSpaceProxyTest):
-	  kill a used thread at teardown.  [ruby-dev:41397]
-
-Wed May 26 12:08:06 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* random.c (random_rand): subtraction method of non-numeric can
-	  return Float.  [ruby-dev:41410]
-
-Wed May 26 11:50:09 2010  Eric Hodel  <drbrain@segment7.net>
-
-	* marshal.c (Init_marshal): document marshal_dump and marshal_load.
-
-Wed May 26 10:35:37 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* configure.in (rb_cv_large_fd_select): needed on mingw, even
-	  though fd_mask is not available.  [ruby-core:30401]
-
-Tue May 25 14:00:51 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* regparse.c (add_code_range_to_buf0): fix false negative
-	  warning when given range is just before previous range.
-	  [ruby-dev:41406]
-
-Tue May 25 16:37:39 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* misc/ruby-style.el (ruby-style-version): take revision if
-	  keyword is expanded. [ruby-dev:41408]
-
-Tue May 25 13:26:49 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* include/ruby/vm.h, include/ruby/encoding.h: add external
-	  linkage.
-
-Tue May 25 01:46:49 2010  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* vm_eval.c (rb_f_caller): update rdoc.  a patch from Nobuhiro IMAI
-	  <nov at yo.rim.or.jp> in [ruby-dev:41387].
-
-Mon May 24 23:04:41 2010  Tanaka Akira  <akr@fsij.org>
-
-	* error.c: fix wrong exception class name in rdoc.
-
-Mon May 24 19:00:34 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* parse.y (warn_balanced, parser_yylex): no warnings after closing
-	  parens.
-
-Mon May 24 12:52:44 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* common.mk (change), tool/change_maker.rb: make a brief template
-	  for ChangeLog.
-
-Mon May 24 09:19:59 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* gc.c (gc_sweep): suppress a warning on VC.
-
-Mon May 24 08:16:02 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* process.c (rb_f_spawn): use correct command name for the error
-	  message.  [ruby-dev:41395]
-
-Sun May 23 17:48:39 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* ext/openssl/lib/openssl/x509-internal.rb, lib/forwardable.rb,
-	  lib/irb/cmd/fork.rb, lib/mutex_m.rb,
-	  lib/shell/process-controller.rb, lib/sync.rb, object.c:
-	  suppress warnings patched by Benoit Daloze at [ruby-core:30366].
-
-	* parse.y (warn_balanced): no warning for singleton class.
-	  [ruby-core:30366]
-
-Sun May 23 16:56:11 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* include/ruby/ruby.h (CONST_ID_CACHE, rb_intern_const): suppress
-	  warnings with -Wconversion.
-
-Sun May 23 07:08:34 2010  Aaron Patterson <aaron@tenderlovemaking.com>
-
-	* ext/psych/lib/psych/json/stream.rb: adding a JSON streaming API
-
-	* ext/psych/lib/psych/stream.rb: ditto
-
-	* ext/psych/lib/psych.rb: using autoload
-
-	* ext/psych/lib/psych/json.rb: ditto
-
-	* ext/psych/lib/psych/json/tree_builder.rb: refactor
-
-	* ext/psych/lib/psych/visitors/json_tree.rb: refactor
-
-Sat May 22 03:53:05 2010  Satoshi Shiba  <shiba@rvm.jp>
-
-	* cont.c (fiber_setcontext): Use swapcontext() instead longjmp().
-	  [ruby-dev:41316] [Bug #3295]
-
-Fri May 21 19:11:42 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* ext/nkf/nkf.c (rb_nkf_convert, rb_nkf_guess): check too huge
-	  string.
-
-Fri May 21 18:12:12 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* include/ruby/ruby.h (rb_intern): C90 needs nonempty macro
-	  arguments.
-
-Fri May 21 13:55:46 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* configure.in (LIBRUBYARG_SHARED): shared library will not be
-	  created unless enable-shared.
-
-	* ruby.c (ruby_init_loadpath_safe): use real path for non-shared
-	  build.
-
-Fri May 21 12:25:58 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* marshal.c (w_float): use dtoa directly instead of stripping
-	  needless trailing .0.
-
-	* numeric.c (flo_to_s): reverted.  [ruby-dev:41341]
-
-Fri May 21 01:06:05 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* thread.c (subtract_tv): if the rest is zero, should finish waiting
-	  immediately.
-
-	* win32/win32.c (subtract): ditto.
-	  based on a patch from Roger Pack in [ruby-core:27957].
-
-Thu May 20 22:49:04 2010  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* re.c (rb_reg_s_union_m): update rdoc.  [ruby-dev:41354]
-
-Thu May 20 22:08:28 2010  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* vm_eval.c (rb_f_caller): update rdoc.  a patch from Nobuhiro IMAI
-	  <nov at yo.rim.or.jp> in [ruby-dev:41348].
-
-Thu May 20 22:04:05 2010  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* vm.c (vm_backtrace_each): now takes an init function to distinguish
-	  an empty stack from out of stack.  [ruby-dev:41366]
-
-	* vm_eval.c (print_backtrace, rb_thread_backtrace): ditto.
-
-Thu May 20 20:47:46 2010  Masaki Suketa <masaki.suketa@nifty.ne.jp>
-
-	* ext/win32ole/win32ole.c (ole_invoke): raise NoMethodError
-	  when COM method is not found. [ruby-core:30160] [Bug #3277]
-
-	* test/win32ole/test_win32ole.rb (test_no_method_error): ditto.
-
-Thu May 20 16:17:14 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* ext/psych/emitter: C99(gcc)-ism.
-
-Thu May 20 12:59:49 2010  Aaron Patterson <aaron@tenderlovemaking.com>
-
-	* ext/psych/lib/psych/stream.rb: adding YAML streaming API for
-	  infinite length streams.
-
-	* ext/psych/lib/psych.rb: refactoring for streaming API
-
-	* ext/psych/lib/psych/{handler, stream, tree_builder}.rb: ditto
-
-Thu May 20 02:12:20 2010  Aaron Patterson <aaron@tenderlovemaking.com>
-
-	* ext/psych/emitter.c: output strings are automatically transcoded
-
-Wed May 19 23:36:57 2010  Hidetoshi NAGAI  <nagai@ai.kyutech.ac.jp>
-
-	* ext/tk/extconf.rb: [ruby-dev:41334] [Bug #3307] invalid result
-	  on searching tcl.h/tk.h. Thanks, Masaya Tarui.
-
-Wed May 19 23:19:30 2010  Shugo Maeda  <shugo@ruby-lang.org>
-
-	* lib/net/imap.rb (disconnect): closes the socket of a Net::IMAP
-	  object only when it is not closed.  [ruby-dev:41350]
-
-Wed May 19 20:09:38 2010  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* vm_eval.c (rb_f_caller): return [] instead of nil when the function
-	  is called on toplevel.  [ruby-dev:41348]
-
-Wed May 19 19:58:01 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* ext/socket/extconf.rb: mswin/mingw ruby has socketpair(), but it's
-	  not exist as such name in ruby static library, so mkmf.rb cannot
-	  find it.
-
-Wed May 19 19:45:10 2010  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* iseq_compile_each (NODE_DEFINED): put nil first to fix stack
-	  consistency.  [ruby-core:30293]
-	  Now, lfinish[0] of defined_expr seems not to be used.  Refactoring
-	  may be needed.
-
-Wed May 19 16:55:09 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* numeric.c (rb_num2ulong): use rb_big2ulong for data from
-	  Bignum. Without this 32bit integer on 32bit environment
-	  can't converted into long.
-	  This fixes 1) and 2) of [ruby-dev:41289]
-
-Mon May 17 22:19:16 2010  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* process.c: suppress warning for signed and unsigned type
-	  inconsistency.
-
-	* ext/psych/parser.c: ditto.
-
-	* ext/sdbm/_sdbm.c: ditto.
-
-	* ext/syck/rubyext.c: ditto.
-
-Mon May 17 21:30:50 2010  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* .gitignore: updated.
-
-Mon May 17 21:08:53 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* win32/win32.c (argv_size): merged into join_argv() to maintain the
-	  agreement with it.  removed code has a calculation bug.
-	  fixed [Bug#2388]
-
-	* win32/win32.c (join_argv): calc and return the length of joined
-	  argv.
-	  the cause of the original bug was clarified by Masaya TARUI
-	  <tarui AT prx.jp> and the solution was suggested by him, too.
-
-Mon Apr  5 09:20:08 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* enc/iso_2022_jp.h: add CP50220.
-
-	* enc/trans/iso2022.trans: add converter for CP50220.
-
-Mon May 17 09:37:25 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* lib/fileutils.rb (FileUtils::Entry_#entries): returns pathname in
-	  UTF-8 on Windows to allow FileUtils accessing all pathnames
-	  internally.
-
-Mon May 17 01:07:48 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* dln.c (rb_w32_check_imported): workaround for VC6.
-
-Sun May 16 22:21:32 2010  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* proc.c (mnew): initialize a field.  a patch from Takahiro Kambe.
-	  [ruby-dev:41312]
-
-Sun May 16 22:17:35 2010  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* eval.c (setup_exception): let SystemStackError#backtrace return an
-	  single element array instead of string itself.  [ruby-core:30196]
-
-Sun May 16 21:51:04 2010  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* parse.y (parser_read_escape, parser_tokadd_escape): allow a hex or
-	  octal encoded character after \c.  This seemed to be prohibited at
-	  r13836, but its ChangeLog mentions nothing about this prohibition.
-	  So I assume this prohibition is not intended.  [ruby-core:27229]
-
-Sun May 16 21:14:04 2010  Yuki Sonoda (Yugui)  <yugui@yugui.jp>
-
-	* ruby/test_rubyoptions.rb (TestRubyOptions#test_segv_test):
-	  fixes "NoMethodError: undefined method `[]=' for nil:NilClass"
-
-Sun May 16 17:16:09 2010  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* proc.c (proc_binding): don't propagate filename and line_no of
-	  binding that is created from C level.  [ruby-dev:41322]
-
-	* vm_eval.c (eval_string_with_cref): ditto.
-
-Sun May 16 15:09:36 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* dln.c (rb_w32_check_imported): check if extension library to be
-	  loaded imports from different ruby dll.
-
-Sun May 16 14:55:39 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* common.mk (dln_find.o): fix dependency.
-
-Sun May 16 13:55:25 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* error.c (rb_loaderror): use locale string, not ascii-8bit.
-
-Sun May 16 11:39:15 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* include/ruby/missing.h (signbit): add missing prototype.
-
-Sun May 16 10:49:47 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* ext/iconv/iconv.c (rb_iconv_sys_fail): fix number of arguments.
-	  a patch by Masaya TARUI <tarui AT prx.jp>.
-
-Sun May 16 02:24:27 2010  Yutaka Kanemoto  <kanemoto@ruby-lang.org>
-
-	* configure.in: can not load libruby.so if gcc is used with
-	  --enable-shared on AIX.
-
-Sat May 15 17:16:15 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* ext/iconv/iconv.c (rb_iconv_sys_fail): raise BrokenLibrary if
-	  errno is not set.  [ruby-dev:41317]
-
-Fri May 14 07:27:07 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* marshal.c (w_float): strip ".0" from end for rubyspec.
-
-Fri May 14 01:17:10 2010  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* vm_core.c (rb_thread_struct): add a field for sigaltstack.
-
-	* thread_pthread.c (thread_start_func_1): initialize machine stack
-	  information.
-
-	* thread.c (thread_start_func_2): set sigaltstack for each sub thread.
-	  [ruby-core:24540] [ruby-core:30207]
-
-Thu May 13 21:40:39 2010  Tanaka Akira  <akr@fsij.org>
-
-	* missing/ffs.c (ffs): fixed for non-zero values.
-
-Thu May 13 18:45:25 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* ext/io/console/console.c (get_write_fd): return primary fd if no
-	  io is tied for writing.
-
-Thu May 13 18:15:33 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* io.c (swallow): should use more_char() instead of fill_cbuf().
-	  suggested by akr.
-
-Thu May 13 17:56:07 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* ext/io/console/console.c (console_set_echo, console_echo_p): use
-	  primary fd.  [ruby-dev:41309]
-
-Thu May 13 13:30:05 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* marshal.c (w_float): use minimal representation.
-
-	* numeric.c (ruby_dbl2cstr): split from rb_float_new.
-
-Thu May 13 13:09:24 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* vm_core.h (rb_vm_get_sourceline): moved from eval_intern.h for
-	  vm_dump.c.
-
-Thu May 13 12:53:13 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* io.c (swallow): support text mode and UTF-16/32 as internal encoding.
-	  [Bug #1576]
-
-	* io.c (io_shift_cbuf): read and throw it away when str is NULL.
-
-Thu May 13 09:45:27 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* win32/Makefile.sub: link with ffs.obj.
-
-Thu May 13 07:37:49 2010  Tanaka Akira  <akr@fsij.org>
-
-	* ext/sdbm/_sdbm.c: include unistd.h before sdbm.h for off_t.
-	  fix compilation problem on FreeBSD 6.4.
-
-Wed May 12 23:48:37 2010  Tanaka Akira  <akr@fsij.org>
-
-	* include/ruby/intern.h (rb_quad_pack): deprecated.
-	  (rb_quad_unpack): ditto.
-
-Wed May 12 22:22:05 2010  Tanaka Akira  <akr@fsij.org>
-
-	* time.c (rb_big_abs_find_minbit): use ffs().
-
-	* configure.in: check ffs().
-
-	* missing/ffs.c: new file.
-
-	* include/ruby/missing.h (ffs): declared.
-
-Wed May 12 16:43:12 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* numeric.c (flo_to_s): fixed broken output including nuls.
-
-Wed May 12 16:25:46 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* numeric.c (flo_to_s): exponent needs 2 digits.
-
-Wed May 12 16:02:43 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* numeric.c (flo_to_s): fill lower zeros.
-
-Wed May 12 15:45:36 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* lib/rdoc/generator/ri.rb (generate): should load existing cache
-	  before generating it.
-
-Wed May 12 15:04:57 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* ext/bigdecimal/lib/bigdecimal/math.rb (BigMath#log): improved
-	  precision and performance. [ruby-dev:41295]
-
-Wed May 12 11:39:10 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* ext/socket/extconf.rb: test all IPPROTO_* constants for recent Win32
-	  SDK.
-
-Wed May 12 10:57:04 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* numeric.c (flo_to_s): make minimum string representation.
-	  [ruby-core:30145]
-
-Wed May 12 09:21:05 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* re.c (rb_reg_initialize_m): fix wrong index for the lang
-	  option's value 'N'. reported by Masaya TARUI via IRC.
-
-Tue May 11 23:07:22 2010  Tanaka Akira  <akr@fsij.org>
-
-	* ext/socket/extconf.rb: test IPPROTO_IP and IPPROTO_IPV6 constants.
-
-	* ext/socket/mkconstants.rb: define macros for enum.
-
-	  [ruby-dev:38849]
-
-Tue May 11 21:53:18 2010  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* test/rake/test_task_arguments.rb: makes ENV empty during tests
-	  because ENV may change the behavior of Rake::TaskArguments.
-	  [ruby-core:29984]
-
-Tue May 11 15:14:30 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* enc/utf_8.c: Add new alias UTF-8-HFS for UTF8-MAC.
-	  http://www.gnu.org/software/emacs/NEWS.23.2
-
-Tue May 11 13:46:00 2010  Kenta Murata <mrkn@mrkn.jp>
-
-	* ext/bigdecimal/lib/bigdecimal/math.rb (atan),
-	  test/bigdecimal/test_bigmath.rb (test_atan): explicitly specify
-	  the precision for calculating a reciprocal number of an argument.
-	  [Bug #3267]
-
-Tue May 11 11:49:44 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* ext/sdbm/sdbm.h (DBM): large file support on win32.
-	  [ruby-core:23039]
-
-	* ext/sdbm/depend: objects depend on sdbm.h.
-
-Tue May 11 09:57:05 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* eval_intern.h (rb_vm_get_sourceline): add prototype.
-
-Tue May 11 09:53:07 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* ext/psych/parser.c (PSYCH_TRANSCODE): get rid of bare use of gcc
-	  extension.
-
-Tue May 11 01:20:43 2010  Aaron Patterson <aaron@tenderlovemaking.com>
-
-	* ext/psych/parser.c (parse): Return strings encoded as
-	  Encoding.default_internal if set.
-
-Mon May 10 23:50:19 2010  Tanaka Akira  <akr@fsij.org>
-
-	* pack.c (pack_unpack): add a missing break.
-
-Mon May 10 14:13:04 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* time.c (rb_big_abs_find_minbit): get rid of a warning of VC.
-
-Mon May 10 13:59:42 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* win32/win32.c, include/ruby/win32.h (rb_w32_has_cancel_io): new
-	  function.
-
-	* io.c (WAIT_FD_IN_WIN32): check only when it's not cancelable.
-
-Mon May 10 06:59:19 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* common.mk (rdoc): rdoc should depend main. Moreover when XRUBY
-	  is miniruby, it can run after miniruby is built.
-
-Mon May 10 03:36:56 2010  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* vm_eval.c (eval_string_with_cref): propagate filename and line_no
-	  of binding.  [ruby-dev:38767] [ruby-core:28307]
-
-	* vm_core.h (rb_binding_t), proc.c: add filename and line_no fields to
-	  preserve them.
-
-Mon May 10 02:58:33 2010  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* compile.c (iseq_compile_each), vm_insnhelper.c (vm_invoke_block,
-	  vm_throw): allow "return" and "yield" even in singleton class
-	  definition.  based on a patch from wanabe <s.wanabe AT gmail.com>
-	  for "return".  [ruby-core:21379] [ruby-dev:40975]
-
-	* insns.def (defineclass): ditto (straightforwardly push block ptr,
-	  instead of dfp ptr with special flag).
-
-	* vm_core.h (RUBY_VM_CLASS_SPECIAL_P): ditto (no longer needed).
-
-	* proc.c (proc_new): ditto (remove handling for special flag).
-
-	* bootstraptest/test_jump.rb: add tests for above.
-
-Mon May 10 02:29:51 2010  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* cont.c (fiber_switch): raise FiberError when returning to dead
-	  fiber.  [ruby-dev:40833]
-
-Mon May 10 02:07:20 2010  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* lib/thread.rb (ConditionVariable#wait): ensure to remove the current
-	  thread from waiters.  [ruby-core:29835]
-
-Mon May 10 00:54:15 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* ext/io/console/console.c (console_set_raw): new method.
-
-	* ext/io/console/console.c (ttymode): reverted previous commit.
-
-Sun May  9 23:53:14 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* include/ruby/ruby.h (RB_GC_GUARD_PTR): get rid of removal by
-	  optimization.
-
-Sun May  9 23:07:53 2010  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* proc.c (proc_dup): copy blockprocval.  proc_dup is used by
-	  define_method, which made blockprocval be GC'ed mistakenly.
-	  [ruby-core:30023]
-
-Sun May  9 16:28:15 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* cont.c (fiber_initialize_machine_stack_context): try to release
-	  unnecessary fibers and retry to create.  based on a patch from
-	  masaya tarui at [ruby-dev:41230].
-
-Sun May  9 08:32:56 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* ext/json/generator/generator.c (fbuffer_inc_capa):
-	  fix the use of REALLOC_N. [ruby-dev:41227]
-
-Sun May  9 09:30:09 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* ext/json/{generator/generator.c,parser/parser.rl}: fixed indent.
-
-	* ext/json/{generator,parser}/depend: added.
-
-Sun May  9 09:15:03 2010  Shugo Maeda  <shugo@ruby-lang.org>
-
-	* test/net/imap/test_imap.rb: use IPv4 for
-	  test_imaps_post_connection_check.  [ruby-dev:41189]
-
-Sun May  9 08:24:24 2010  Shugo Maeda  <shugo@ruby-lang.org>
-
-	* lib/net/imap.rb (disconnect): terminates @receiver_thread even if
-	  @sock.shutdown raises an exception.  [ruby-dev:34881]
-
-Sun May  9 06:15:21 2010  Kazuhiro NISHIYAMA  <zn@mbf.nifty.com>
-
-	* io.c (nogvl_copy_stream_sendfile): ISO C90 forbids mixed
-	  declarations and code.
-
-Sun May  9 02:57:02 2010  Aaron Patterson <aaron@tenderlovemaking.com>
-
-	* ext/fiddle/lib/fiddle.rb: only require DL if it hasn't been required
-	  yet. [ruby-core:30095]
-
-Sun May  9 01:15:18 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* cont.c (stackgrowdirection): removed duplicated code, use
-	  STACK_UPPER macro instead.
-
-	* gc.h (STACK_DIR_UPPER): moved from thread_pthread.c.
-
-Sun May  9 00:35:56 2010  Yuki Sonoda (Yugui)  <yugui@yugui.jp>
-
-	* test/dl/test_base.rb (libc_so, libm_so): supports solaris.
-
-Sat May  8 19:03:31 2010  Yuki Sonoda (Yugui)  <yugui@yugui.jp>
-
-	* spec/default.mspec (config): . is no longer in $:.
-
-Sun May  9 00:27:46 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* thread.c (rb_thread_aset): fixed argument type.
-
-Sat May  8 23:09:44 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* NEWS (io/console): IO#noecho and IO#raw without block are
-	  obsolete already.  [ruby-dev:41226]
-
-	* ext/io/console/console.c (ttymode): save duped file descriptors
-	  and restore tty modes using them, so that original modes can be
-	  restored even if original fds are closed.  [ruby-dev:41225]
-
-Sat May  8 13:48:31 2010  Marc-Andre Lafortune  <ruby-core@marc-andre.ca>
-
-	* array.c (rb_ary_fetch, rb_ary_splice, rb_ary_store): Improve
-	  IndexError
-	  messages [ruby-core:28394]
-
-	* hash.c (rb_hash_fetch_m): Improve KeyError message
-
-Sat May  8 13:11:28 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* lib/rubygems/user_interaction.rb (Gem::StreamUI#ask_for_password):
-	  use io/console.
-
-	* ext/io/console: imported.  [ruby-dev:40897]
-
-Sat May  8 12:25:15 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* ext/etc/etc.c (etc_systmpdir): moved from ext/tmpdir.
-
-	* ext/etc/etc.c (etc_sysconfdir): added.
-
-	* lib/rubygems/config_file.rb, lib/tmpdir.rb: use etc.
-
-Sat May  8 11:07:41 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* ext/bigdecimal/bigdecimal.c (VpAlloc): ensure buf does not get
-	  collected.  based on a patch masaya tarui at [ruby-dev:41213].
-
-Sat May  8 10:03:39 2010  Tanaka Akira  <akr@fsij.org>
-
-	* ext/socket/lib/socket.rb (BasicSocket#connect_address): MacOS X 10.6
-	  returns "::ffff:a.b.c.d" for IPv4-mapped IPv6 address.
-	  [ruby-dev:41215] patch by Tomoyuki Chikanaga.
-
-Fri May  7 23:51:39 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* version.h: bump up to 1.9.3.
-
-Fri May  7 11:30:51 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* tool/rbinstall.rb (install-man): install mdocs directly without
-	  temporary files.  [ruby-dev:41204]
-
-Fri May  7 09:16:16 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* ext/tk/extconf.rb (get_tclConfig_dirs): glob with EXEEXT.
-
-	* ext/tk/extconf.rb (search_tclConfig): fixed typo.
-
-Fri May  7 06:45:28 2010  Hidetoshi NAGAI  <nagai@ai.kyutech.ac.jp>
-
-	* ext/tk/extconf.rb: search directories on PATH, only if containing
-	  tclsh or wish command (probably right fix for [ruby-core:30010]).
-
-Fri May  7 03:40:58 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* ext/bigdecimal/bigdecimal.c (VpCtoV): fix to check overflow.
-
-Thu May  6 22:19:38 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* cont.c: define FIBER_USE_NATIVE only when _WIN32_WINNT >= 0x0400
-	  on Windows because Fiber APIs are supported only such building
-	  (and running) environments.
-	  [ruby-dev:41192]
-
-Thu May  6 19:13:43 2010  NAKAMURA, Hiroshi  <nahi@ruby-lang.org>
-
-	* test/openssl/test_ec.rb: added test_dsa_sign_asn1_FIPS186_3. dgst is
-	  truncated with ec_key.group.order.size after openssl 0.9.8m for
-	  FIPS 186-3 compliance.
-
-	  WARNING: ruby-openssl aims to wrap an OpenSSL so when you're using
-	  openssl 0.9.8l or earlier version, EC.dsa_sign_asn1 raises
-	  OpenSSL::PKey::ECError as before and EC.dsa_verify_asn1 just returns
-	  false when you pass dgst longer than expected (no truncation
-	  performed).
-
-	* ext/openssl/ossl_pkey_ec.c: rdoc typo fixed.
-
-Thu May  6 18:12:43 2010  Koichi Sasada  <ko1@atdot.net>
-
-	* cont.c (fiber_setcontext): Fix last commit.
-
-Thu May  6 17:16:42 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* time.c (rb_localtime_r2): get rid of infinite loop bug of
-	  localtime() on x86_64-darwin.  [ruby-core:30031]
-
-Thu May  6 15:56:12 2010  Aaron Patterson <aaron@tenderlovemaking.com>
-
-	* ext/fiddle/*: Adding fiddle library to wrap libffi
-	* test/fiddle/*: testing fiddle extension
-	* ext/dl/lib/dl.rb: Requiring fiddle if it is available
-	* ext/dl/lib/dl/callback.rb: using Fiddle if it is available
-	* ext/dl/lib/dl/func.rb: ditto
-
-Thu May  6 15:04:37 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* string.c (rb_str_match_m): add description about optional
-	  position parameter. [ruby-list:47064]
-	  patched by KISHIMOTO, Makoto <ksmakoto AT dd.iij4u.or.jp>
-
-Thu May  6 14:12:39 2010  Tanaka Akira  <akr@fsij.org>
-
-	* lib/tmpdir.rb: test RUBY_PLATFORM for loading tmpdir.so to avoid
-	  LoadError.
-
-Thu May  6 12:41:00 2010  Kenta Murata  <mrkn@mrkn.jp>
-
-	* NEWS: add rationalize methods of Complex, Float, Integer, NilClass,
-	  and Rational classes.
-
-Thu May  6 12:12:26 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* README: update.
-
-Thu May  6 03:34:29 2010  Koichi Sasada  <ko1@atdot.net>
-
-	* cont.c: apply FIBER_USE_NATIVE patch.  This patch improve
-	  Fiber context switching cost using system APIs.  Detail comments
-	  are written in cont.c.
-
-Thu May  6 02:16:48 2010  Koichi Sasada  <ko1@atdot.net>
-
-	* vm_method.c (rb_unlink_method_entry, rb_sweep_method_entry):
-	  added.  Unlinked method entries are collected to
-	  vm->unlinked_method_entry_list.  On the GC timing, mark all method
-	  entries which are on all living threads.  Only non-marked method
-	  entries are collected.  This hack prevents releasing living method
-	  entry.
-	  [Performance Consideration] Since this Method Entry GC (MEGC)
-	  doesn't occur frequently, MEGC will not be a performance bottleneck.
-	  However, to traverse living method entries, every control frame push
-	  needs to clear cfp->me field.  This will be a performance issue
-	  (because pushing control frame is occurred frequently).
-	  Bug #2777 [ruby-dev:40457]
-
-	* cont.c (fiber_init): init cfp->me.
-
-	* gc.c (garbage_collect): kick rb_sweep_method_entry().
-
-	* method.h (rb_method_entry_t): add a mark field.
-
-	* vm.c (invoke_block_from_c): set passed me.
-
-	* vm.c (rb_thread_mark): mark cfp->me.
-
-	* vm_core.h (rb_thread_t): add a field passed_me.
-
-	* vm_core.h (rb_vm_t): add a field unlinked_method_entry_list.
-
-	* vm_insnhelper.c (vm_push_frame): clear cfp->me at all times.
-
-	* vm_insnhelper.c (vm_call_bmethod): pass me.
-
-	* bootstraptest/test_method.rb: add a test.
-
-Wed May  5 22:22:51 2010  wanabe  <s.wanabe@gmail.com>
-
-	* compile.c (iseq_set_sequence): fix check range of ic_index.
-	  a patch from Tomoyuki Chikanaga.  #3236
-
-Wed May  5 21:49:31 2010  Yutaka Kanemoto  <kanemoto@ruby-lang.org>
-
-	* dln.c (aix_loaderror): use execerror for load error on AIX.
-	  This can avoid SEGV reported by Perry Smith.  [Bug #2063]
-
-Wed May  5 20:37:54 2010  wanabe  <s.wanabe@gmail.com>
-
-	* thread_win32.c (w32_wait_events): get GVL before handle interrupt
-	  event.   [ruby-core:27199], [ruby-core:29698]
-
-Wed May  5 19:00:01 2010  Hidetoshi NAGAI  <nagai@ai.kyutech.ac.jp>
-
-	* ext/tk/extconf.rb: revert. enbugged by last commit.
-	  ([ruby-dev:41133], [ruby-dev:41134], [ruby-core:30010])
-
-	* ext/tk/README.tcltklib: ditto.
-
-Wed May  5 15:54:35 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* file.c (rb_stat): use STAT macro instead of calling stat() directly.
-	  reported by Bill Kelly.  [ruby-core:30012]
-
-Wed May  5 11:43:10 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* bootstraptest/test_io.rb (megacontent-copy_stream): get rid of
-	  deadlock.
-
-Wed May  5 07:27:14 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* gc.c (rb_mark_method_entry): renamed.
-
-Wed May  5 05:20:27 2010  Koichi Sasada  <ko1@atdot.net>
-
-	* method.h, vm_method.c: rename some internal functions related to
-	  rb_method_entry_t.
-	  rb_add_method_me()        -> rb_method_entry_set().
-	  rb_get_method_entry()     -> rb_method_entry_without_cache().
-	  rb_gc_mark_method_entry() -> rb_mark_method_entry().
-
-	* class.c, proc.c: ditto.
-
-Tue May  4 22:59:48 2010  wanabe  <s.wanabe@gmail.com>
-
-	* compile.c (iseq_build_body): update iseq->ic_size.
-	  a patch from Tomoyuki Chikanaga. see #3236.
-
-Tue May  4 18:51:22 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* error.c (name_err_mesg_to_str): preserve encoding of inspection.
-	  [ruby-core:29948]
-
-Tue May  4 18:38:16 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* test/fileutils/test_fileutils.rb (test_copy_stream):
-	  IO.copy_stream support binmode only currently.
-	  [ruby-core:23724]
-
-Tue May  4 12:46:09 2010  Koichi Sasada  <ko1@atdot.net>
-
-	* vm_insnhelper.c (argument_error): push correct backtrace.
-	  Bug #2281 [ruby-core:26333]
-
-Tue May  4 12:38:40 2010  Tanaka Akira  <akr@fsij.org>
-
-	* ext/socket/option.c (sockopt_inspect): use rb_str_cat2 and
-	  rb_str_append.
-
-	* ext/socket/ancdata.c (ancillary_inspect): refined.
-
-Tue May  4 11:48:06 2010  Tanaka Akira  <akr@fsij.org>
-
-	* ext/socket/ancdata.c (ancillary_inspect): use rb_str_cat2 and
-	  rb_str_append.
-
-Tue May  4 07:52:33 2010  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* lib/net/http.rb (Net::HTTPResponse#read_chunked): ensure to skip the
-	  last newline of chunk.  [ruby-core:29229]
-
-	* test/net/http/utils.rb: add an option for chunked response test.
-
-	* test/net/http/test_http.rb: add tests for chunked response.
-
-Tue May  4 03:37:54 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* ext/nkf/nkf-utf8/nkf.c: Update nkf 2010-04-28.
-
-Mon May  3 21:08:16 2010  Kazuhiro NISHIYAMA  <zn@mbf.nifty.com>
-
-	* sample/README: update file list. [ruby-core:28981]
-
-Mon May  3 08:15:05 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* ext/syck/emitter.c (syck_scan_scalar): set SCAN_WHITEEDGE flag
-	  when scalar begins with newline.  patches from Dave B <daz AT
-	  d10.karoo.co.uk> at [ruby-core:23019] and caleb clausen at
-	  [ruby-core:25851].  [ruby-core:23006][ruby-core:29925]
-
-Sun May  2 17:52:16 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* lib/rdoc/task.rb (RDoc::Task): should not override newer code.
-
-Sun May  2 17:25:05 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* ext/dl/cfunc.c (rb_dlcfunc_call): ignore signedness.
-
-Sun May  2 12:04:30 2010  wanabe  <s.wanabe@gmail.com>
-
-	* iseq.c (iseq_load): allow filepath to be nil.
-	  a patch from Tomoyuki Chikanaga in [Bug #3229].
-
-Sun May  2 08:54:37 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* lib/cgi.rb (CGI::NEEDS_BINMODE): check if O_BINARY value instead
-	  of fragile check by platform name.
-
-Sun May  2 07:38:43 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* lib/mkmf.rb (dir_config): should not modify argument arrays
-	  themselves.
-
-Sat May  1 22:53:57 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* lib/tempfile.rb (Tempfile#size): stat by path name when it is
-	  closed.
-
-	* lib/test/unit/assertions.rb (Test::Unit::Assertions#assert):
-	  keep the first trace.
-
-	* lib/test/unit/assertions.rb (Test::Unit::Assertions#assert):
-	  fixed filtering.  [ruby-core:29908]
-
-Sat May  1 16:46:44 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* ext/bigdecimal/bigdecimal.c (BigDecimal_IsInfinite): don't use
-	  non-ascii character.
-
-Sat May  1 14:08:29 2010  Eric Hodel  <drbrain@segment7.net>
-
-	* lib/rubygems/server.rb:  Fix bug when serving gems.
-
-Sat May  1 14:05:36 2010  Eric Hodel  <drbrain@segment7.net>
-
-	* lib/rdoc:  Upgrade to RDoc 2.5.8.
-
-Sat May  1 09:43:06 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* lib/test/unit/assertions.rb (Test::Unit::Assertions#assert):
-	  filter out traces in minitest directory.  [ruby-core:29908]
-
-Sat May  1 06:42:57 2010  wanabe  <s.wanabe@gmail.com>
-
-	* win32/win32.c: add declaration of wstati64 for gcc.
-
-Sat May  1 02:41:33 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* merge some patches from win32-unicode-test branch.
-	  see #1685.
-
-	* file.c, include/ruby/intern.h (rb_str_encode_ospath): new function
-	  to convert encoding for pathname.
-
-	* win32.c, include/ruby/win32.h (rb_w32_ulink, rb_w32_urename,
-	  rb_w32_ustati64, rb_w32_uopen, rb_w32_uutime, rb_w32_uchdir,
-	  rb_w32_umkdir, rb_w32_urmdir, rb_w32_uunlink): new functions to
-	  accept UTF-8 path.
-
-	* win32/win32.c (rb_w32_opendir, link, rb_w32_stati64, rb_w32_utime,
-	  rb_w32_unlink): use WCHAR path internally.
-
-	* file.c (rb_stat, eaccess, access_internal, rb_file_s_ftype,
-	  chmod_internal, rb_file_chmod, rb_file_chown, utime_internal,
-	  rb_file_s_link, unlink_internal, rb_file_s_rename): use UTF-8 version
-	  functions on Win32.
-
-	* file.c (apply2files, rb_stat, rb_file_s_lstat, rb_file_symlink_p,
-	  rb_file_readable_p, rb_file_writable_p, rb_file_executable_p,
-	  check3rdbyte, rb_file_identical_p, rb_file_chmod, rb_file_chown,
-	  rb_file_s_link, rb_file_s_symlink, rb_file_s_rename): call
-	  rb_str_encode_ospath() before passing the path to system.
-
-	* io.c (rb_sysopen): ditto.
-
-	* dir.c (dir_chdir, dir_s_mkdir, dir_s_rmdir): ditto.
-
-Sat May  1 00:26:31 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* lib/test/unit/assertions.rb (Test::Unit::Assertions#assert):
-	  assertion message must be String or Proc.  suggested by caleb
-	  clausen at [ruby-core:29884].
-
-Sat May  1 00:14:47 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* test/ruby/test_io.rb: skip false tests on Windows.
-	  [ruby-core:29886]
-
-Fri Apr 30 22:46:27 2010  Marc-Andre Lafortune  <ruby-core@marc-andre.ca>
-
-	* math.c: Math::DomainError < StandardError [ruby-core:29855]
-
-Fri Apr 30 21:40:36 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* test/test_open3.rb (TestOpen3#test_commandline): use simple
-	  command via shell.  [ruby-dev:41100]
-
-Fri Apr 30 15:38:45 2010  Hidetoshi NAGAI  <nagai@ai.kyutech.ac.jp>
-
-	* ext/tk/extconf.rb: better support for MinGW environment.
-
-Fri Apr 30 12:05:20 2010  Tanaka Akira  <akr@fsij.org>
-
-	* file.c (file_expand_path): call rb_str_set_len before BUFCHECK to
-	  prevent rb_str_resize in BUFCHECK discard the content.
-
-Fri Apr 30 11:48:31 2010  Marc-Andre Lafortune  <ruby-core@marc-andre.ca>
-
-	* string.c (rb_str_sub_bang): String#sub! now raises an error when
-	  called on a frozen string, even if no change is made.
-	  See [ruby-core:23657]
-
-Fri Apr 30 11:40:44 2010  Marc-Andre Lafortune  <ruby-core@marc-andre.ca>
-
-	* eval.c (make_exception, rb_obj_extend): Fix error messages in case
-	  of wrong
-	  number of arguments
-
-	* file.c (rb_f_test, rb_file_s_umask): ditto
-
-	* numeric.c (int_chr, num_step): ditto
-
-	* process.c (rb_f_sleep): ditto
-
-	* re.c (rb_reg_initialize_m): ditto
-
-	* signal.c (rb_f_kill, sig_trap): ditto
-
-	* string.c (rb_str_aref_m, rb_str_aset_m, rb_str_count,
-	  rb_str_delete_bang,
-	  rb_str_slice_bang, rb_str_sub_bang, str_gsub): ditto
-
-	* proc.c (curry): rdoc fix
-
-Fri Apr 30 04:09:30 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* time.c (TIMET_MAX): should be time_t, not unsigned_time_t.
-
-Fri Apr 30 03:59:08 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* time.c (rb_time_unmagnify_to_float): should cast.
-
-Fri Apr 30 03:38:14 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* numeric.c (fix_mul): the width of fixnum is same as long's on all
-	  platforms.
-
-Fri Apr 30 03:17:20 2010  Marc-Andre Lafortune  <ruby-core@marc-andre.ca>
-
-	* lib/matrix.rb: Improve algorithm for Matrix#determinant and
-	  Matrix#rank
-	  {determinant,det,rank}_e are now deprecated. [ruby-core:28273]
-	  Also fixes a bug in Determinant#rank (e.g. [[0,1][0,1][0,1]])
-	  Matrix#singular?, Matrix#regular? now raise on rectangular matrices
-	  and use determinant instead of rank.
-
-Fri Apr 30 00:52:56 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* win32/Makefile.sub (config.h): define some constants to select
-	  collect code for win64.
-
-Thu Apr 29 20:10:14 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* test/test_open3.rb (test_commandline): use dump instead of
-	  shellwords.  [ruby-core:23797]
-
-Thu Apr 29 18:39:51 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* lib/thwait.rb (ThreadsWait#join): refined rdoc again.
-	  [ruby-core:29863] [ruby-dev:41092]
-
-Thu Apr 29 14:46:00 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* test/ruby: use more descriptive assertions.
-
-	* test/ruby: fixed nonsense assertions.
-
-	* lib/test/unit/assertions.rb (Test::Unit::Assertions#assert):
-	  reverted.  [ruby-core:29872]
-
-Thu Apr 29 12:33:42 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* lib/thwait.rb (ThreadsWait#join): refined rdoc.  [ruby-core:29863]
-
-Thu Apr 29 12:16:20 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* lib/test/unit/assertions.rb (Test::Unit::Assertions#assert): reject
-	  non-boolean values.  [ruby-core:29868]
-
-Thu Apr 29 11:20:53 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* io.c (seek_before_access): renamed.  see [ruby-core:29861].
-
-	* io.c (rb_io_s_binread): fixed rdoc.  parts of a patch from Roger
-	  Pack in [ruby-core:29861].
-
-Thu Apr 29 03:50:49 2010  James Edward Gray II  <jeg2@ruby-lang.org>
-
-	* lib/xmlrpc/utils.rb: Fixing an incompatibility with
-	  reflection methods returning Symbols.  Patch by
-	  HD Moore.  [ruby-core:29821]
-
-Wed Apr 28 23:53:15 2010  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* lib/thwait.rb: revise rdoc.  a patch from Roger Pack in
-	  [ruby-core:27362].
-
-Wed Apr 28 23:21:42 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* ext/json: Update to JSON 1.4.2.
-
-Wed Apr 28 22:53:57 2010  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* thread. (rb_thread_terminate_all): revert r24591 which caused SEGV
-	  sometimes.  [ruby-dev:40936] [ruby-core:27245] [ruby-core:27416]
-
-Wed Apr 28 22:26:55 2010  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* test/psych/visitors/test_yaml_tree.rb (test_struct_const): remove
-	  Struct::Foo which affects test/ruby/test_struct to warn redefining
-	  constant.
-
-Wed Apr 28 18:04:48 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* time.c (time_timespec): use rb_check_funcall.
-
-Wed Apr 28 17:14:10 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* ext/socket/extconf.rb: CMSG_ macros are broken on 64bit darwin,
-	  because of use of __DARWIN_ALIGN.
-
-Wed Apr 28 16:44:58 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* include/ruby/ruby.h ({RSTRING,RSTRUCT,RBIGNUM}_LENINT): check long
-	  to cast to int.
-
-Wed Apr 28 16:28:51 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* ext/socket/unixsocket.c (sendmsg_blocking, recvmsg_blocking):
-	  define only when used.
-
-	* ext/socket/rubysocket.h: non-implemented method definitions need
-	  to be shared.
-
-Wed Apr 28 10:27:33 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* vsnprintf.c (ruby_vsnprintf, ruby_snprintf): suppress warnings.
-	  why return int in spite of the arguments of size_t?
-
-Wed Apr 28 09:49:21 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* tool/compile_prelude.rb: enable optimization.
-
-Wed Apr 28 09:43:24 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* parse.y (warn_balanced): do not warn for EXPR_ENDFN.
-
-Tue Apr 27 23:57:04 2010  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* eval.c (ruby_cleanup): add exception guard around code running
-	  signal handler (of r27513).  Absence of the guard made
-	  bootstraptest/test_thread.rb fail sometimes.
-
-Tue Apr 27 22:55:29 2010  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* insns.def (onceinlinecache): add exclusion control for a region
-	  between onceinlinecache and setinlinecache.  [ruby-dev:39768]
-
-Tue Apr 27 22:40:54 2010  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* iseq.c (set_relation): do not use top_wrapper as bottom of cref,
-	  which caused constant lookup error when "wrapped load" is used;
-	  instead, use Object as bottom, and push top_wrapper on Object.
-	  [ruby-core:25039]
-
-Tue Apr 27 21:24:40 2010  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* eval.c (ruby_cleanup): before cleanup, check signal buffer and run
-	  handler if any.  [ruby-core:20970]
-
-	* thread.c (rb_threadptr_check_signal): separated from
-	  timer_thread_function.
-
-Tue Apr 27 18:00:50 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* lib/net/smtp.rb (Net::SMTP#rcptto_list): fixed typo.
-	  [ruby-core:29809]
-
-Tue Apr 27 12:44:23 2010  Eric Hodel  <drbrain@segment7.net>
-
-	* lib/rdoc: Import RDoc 2.5.7.  Fixes #1318 and ruby-core:29780.
-
-Tue Apr 27 10:54:14 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* parse.y (parser_read_escape): deny extra character escapes.
-	  [ruby-core:27228]
-
-Tue Apr 27 06:20:13 2010  Tanaka Akira  <akr@fsij.org>
-
-	* io.c (select_internal): IO which cbuf is not empty is readable.
-
-Tue Apr 27 00:07:32 2010  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* parse.y (program): check void_expr when rb_parse_in_main().
-	  [ruby-dev:38717]
-
-Mon Apr 26 20:11:05 2010  Tadayoshi Funaba  <tadf@dotrb.org>
-
-	* complex.c, rational.c, lib/cmath.rb, lib/date.rb lib/date/delta*:
-	  reverted r27484-27486.  now official spec.
-
-Mon Apr 26 15:42:59 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* ext/json/generator/generator.c (convert_UTF8_to_JSON_ASCII): get rid
-	  of a warning.
-
-Mon Apr 26 13:11:57 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* parse.y (ripper_get_value): escape Qundef.
-
-Mon Apr 26 12:42:43 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* parse.y (warn_balanced): warn according to last state.
-
-Mon Apr 26 09:05:30 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* ext/json: Update to JSON 1.4.1.
-
-Sun Apr 25 23:50:08 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* io.c (ruby_dup): update max fd.
-
-Sun Apr 25 21:56:49 2010  Shugo Maeda  <shugo@ruby-lang.org>
-
-	* lib/net/imap.rb (fetch_internal): do not quote message data item
-	  names.  Thanks, Eric Hodel.  [ruby-core:23508]
-
-Sun Apr 25 15:59:02 2010  Tadayoshi Funaba  <tadf@dotrb.org>
-
-	* lib/cmath.rb: reverted experimental r23900.
-
-Sun Apr 25 15:51:00 2010  Tadayoshi Funaba  <tadf@dotrb.org>
-
-	* complex.c, rational.c: reverted experimental r24565.
-
-Sun Apr 25 15:34:48 2010  Tadayoshi Funaba  <tadf@dotrb.org>
-
-	* lib/date.rb, lib/date/delta*: reverted experimental r24567 and
-	  r25393.
-
-Sun Apr 25 11:02:20 2010  wanabe  <s.wanabe@gmail.com>
-
-	* hash.c (ruby_setenv): putenv on msvcrt.dll can't remove empty value.
-
-Sat Apr 24 23:40:50 2010  Tanaka Akira  <akr@fsij.org>
-
-	* lib/pp.rb: use [""].pack("p").size to detect the pointer size.
-
-Sat Apr 24 21:07:27 2010  Tanaka Akira  <akr@fsij.org>
-
-	* test/psych/test_psych.rb: don't leave temporary files.
-
-Sat Apr 24 16:27:48 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* Makefile.in (RUBY_PROGRAM_VERSION): added
-
-	* tool/rbinstall.rb: expand target file name.
-
-	* template/fake.rb.in: no need for hook if extmk.
-
-Sat Apr 24 14:40:20 2010  Tanaka Akira  <akr@fsij.org>
-
-	* io.c: raise IOError when byte oriented operations occur with
-	  non-empty character buffer.
-	  [ruby-dev:40493] [ruby-dev:40506]
-
-Sat Apr 24 13:06:57 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* ruby.c (get_arglen): skip the last terminator of argv before
-	  checking environ.
-
-	* ruby.c (get_arglen): duplicate environ area if setenv and unsetenv
-	  are provided.
-
-	* ruby.c (set_arg0): keep empty strings.
-
-Sat Apr 24 09:44:40 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* ext/syck/yaml2byte.c (bytestring_append, bytestring_extend):
-	  removed wrong extra assignments.  a patch from Marcus Rueckert
-	  <darix AT opensu.se> at [ruby-core:29759].
-
-Sat Apr 24 00:41:52 2010  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* process.c (rb_f_fork): remove after_exec() which sometimes caused
-	  two timer threads started.  [ruby-core:25217]
-
-	* signal.c: use pthread_sigmask() instead of sigprocmask().
-	  sigprocmask() is unspecified behavior on multi-thread programs.
-	  [ruby-core:25217]
-
-Sat Apr 24 00:36:05 2010  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* test/dl/test_base.rb: add kfreebsd support.  based on a patch from
-	  Petr Salinger in [ruby-core:29769].
-	  http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=560293
-
-Sat Apr 24 00:14:41 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* ext/openssl/ossl_ssl_session.c (SSL_SESSION_cmp): remove static for
-	  loopy version of openssl (0.9.8l?).
-
-Fri Apr 23 23:27:17 2010  Tanaka Akira  <akr@fsij.org>
-
-	* ext/openssl/ossl_config.c: fix compilation failure with
-	  OpenSSL 0.9.8.
-
-Fri Apr 23 17:29:35 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* ext/openssl/ossl_config.c: OpenSSL 1.0.0 support.
-	  [ruby-core:29256]
-
-	* ext/openssl/extconf.rb: check some functions added/removed at
-	  OpenSSL 1.0.0.
-
-	* ext/openssl/ossl_engine.c (ossl_engine_s_load): use engines which
-	  exists.
-
-	* ext/openssl/ossl_ssl_session (SSL_SESSION_cmp): removed at 1.0.0,
-	  so implement compatible function here.
-
-Fri Apr 23 14:37:22 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* gem_prelude.rb (Gem::QuickLoader.load_full_rubygems_library):
-	  get rid of creating same regexps many times.
-
-	* lib/rubygems/custom_require.rb (Kernel#require): ditto.
-
-Fri Apr 23 14:07:36 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* doc/etc.rd, doc/etc.rd.ja: moved from ext/etc.
-
-	* ext/etc.c (Init_etc): fixed rdoc.
-
-Fri Apr 23 11:31:25 2010  Eric Hodel  <drbrain@segment7.net>
-
-	* lib/rdoc: Update to RDoc 2.5.6.
-
-Fri Apr 23 04:11:26 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* test/ripper/test_parser_events.rb (test_unterminated_regexp):
-	  separate test.
-
-Fri Apr 23 01:47:54 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* win32/win32.c (rb_w32_wopen): shouldn't use FILE_FLAG_OVERLAPPED with
-	  normal file.  #1807, #2510, #2549
-
-Fri Apr 23 01:28:03 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* thread_win32.c (ubf_handle): remove unused typedef.
-
-Thu Apr 22 23:10:59 2010  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* proc.c (mnew): fix wrong error message when Kernel#public_method
-	  receives name of private method.  [Bug #2425]
-
-Thu Apr 22 22:56:42 2010  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* bootstraptest/test_thread.rb: fix test.  [Bug #2342]
-
-Thu Apr 22 21:50:17 2010  Keiju Ishitsuka  <keiju@ruby-lang.org>
-
-	* lib/irb/ext/multi-irb.rb: fix multi-irb running
-	  parallelly. [ruby-dev:41031] [Bug #3182]
-
-Thu Apr 22 17:13:34 2010  Eric Hodel  <drbrain@segment7.net>
-
-	* lib/rubygems: Import RubyGems 1.3.7.pre.1 (as 1.3.6.1).
-
-Thu Apr 22 16:43:31 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* parse.y (warn_balanced): removed false warning.
-
-	* parse.y (parser_yylex): skip whitespaces after method name.
-
-Wed Apr 22 02:16:00 2010  Kenta Murata  <mrkn@mrkn.jp>
-
-	* ext/bigdecimal/bigdecimal.[ch]: replace _DEBUG with BIGDECIMAL_DEBUG
-	  to prevent activating debugging code when compiled with -DEBUG flag
-	  on Windows. [ruby-core:22989] #1308
-
-Wed Apr 21 21:24:20 2010  Tanaka Akira  <akr@fsij.org>
-
-	* ext/digest/sha2/extconf.rb: check SHA256_CTX and SHA512_CTX to fix
-	  compilation failure on OpenBSD 4.4.
-
-Wed Apr 21 15:13:10 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* io.c (io_getc): fix incomplete character immediately before EOF
-	  with newline converter. [ruby-dev:41024]
-
-Wed Apr 21 13:44:54 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* parse.y (regexp): check each fragments.   [ruby-core:27374]
-
-Wed Apr 21 13:36:01 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* parse.y (parser_yylex): reverted r27388 due to backward
-	  compatibility.
-
-	* parse.y (parser_yylex): warn confusing binary operators after
-	  local variable.
-
-Wed Apr 21 11:53:47 2010  Eric Hodel  <drbrain@segment7.net>
-
-	* lib/rdoc:  Update to RDoc 2.5.5.  Fixes bugs in ri, Darkfish and
-	  rdoc option handling.
-
-Wed Apr 21 11:31:35 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* parse.y (parser_yylex): abandoned EXPR_VCALL.
-
-Wed Apr 21 03:17:17 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* io.c (io_getc): set read_encoding to resulted one character
-	  string. [ruby-dev:41023]
-
-Wed Apr 21 00:29:39 2010  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* bignum.c (bigmul1_karatsuba): fix calculation order to prevent
-	  underflow.  [ruby-core:29088]
-
-Wed Apr 21 00:26:17 2010  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* compile.c (NODE_NEXT, NODE_REDO): add dummy putnil instruction to
-	  fix stack consistency error.  [ruby-core:28172]
-
-	* bootstraptest/test_jump.rb: add a test for above.
-
-Wed Apr 21 00:16:44 2010  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* ext/zlib/zlib.c (rb_deflate_params): update buf_filled count because
-	  deflateParams writes to out buffer.  And, revert r18029 because the
-	  flush was not needed now and emits garbage.  [ruby-dev:40802]
-
-Wed Apr 21 00:01:05 2010  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* vm_method.c (rb_add_method_def): decrement alias count of
-	  rb_method_definition_t to prevent memory leak.  see
-	  [ruby-dev:41021].
-
-Tue Apr 20 21:33:06 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* ext/dl/win32/lib/win32/registry.rb (PredefinedKey#create): root key
-	  name should be a string.  fixed [ruby-core:28192]
-
-Tue Apr 20 19:25:50 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* parse.y (parser_yylex): fix for tLPAREN_ARG.
-
-Tue Apr 20 12:34:23 2010  Takeyuki FUJIOKA  <xibbar@ruby-lang.org>
-
-	* lib/cgi/{core, util}.rb (RFC822_DAYS, RFC822_MONTHS):
-	  move the constant because used only util.rb.
-
-Tue Apr 20 12:24:57 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* parse.y (lex_state_e, IS_END, IS_SPCARG, parser_yylex): separate
-	  the state after vcall.  [ruby-core:29578]
-
-Tue Apr 20 01:03:00 2010  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* bootstraptest/test_fork.rb: add a test for [ruby-core:28924].
-
-Tue Apr 20 00:43:03 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* file.c (rb_file_s_extname): skip last directory separators.
-	  [ruby-core:29627]
-
-Tue Apr 20 00:41:25 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* io.c (internal_{read,write}_func, rb_{read,write}_internal):
-	  reverted r27265, since now rb_thread_blocking_region() preserves
-	  errno.
-
-Mon Apr 19 23:14:45 2010  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* thread.c (rb_thread_blocking_region, rb_thread_blocking_region_end):
-	  preserve errno.  [Bug #2606] [ruby-core:28924]
-
-Mon Apr 19 19:41:10 2010  URABE Shyouhei  <shyouhei@ruby-lang.org>
-
-	* lib/fileutils.rb (FileUtils::cp_r): backport r11156 from ruby_1_8.
-
-Mon Apr 19 19:18:53 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* parse.y (parser_yylex): reduced duplicated conditions.
-
-Mon Apr 19 13:58:04 2010  Eric Hodel  <drbrain@segment7.net>
-
-	* lib/rdoc:  Update to RDoc 2.5.4.  Fixes #3169, #3160, #3023.
-
-Mon Apr 19 12:46:15 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* lib/timeout.rb (Timeout#timeout): propagate errors to the
-	  caller.  [ruby-dev:41010]
-
-Mon Apr 19 00:27:03 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* vm_method.c (rb_add_method_def): workaround fix for redefinition
-	  of methods. This is because cfp->me uses the rb_method_entry
-	  which is freed by redefinition of remove_method. Note that
-	  reusing may cause another problem when the usage is changed.
-	  [ruby-core:27320] [ruby-core:29464]
-
-Sun Apr 18 22:13:21 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* parse.y (string_content): cond_stack and cmdarg_stack are VALUE.
-
-Sun Apr 18 18:07:47 2010  Tanaka Akira  <akr@fsij.org>
-
-	* lib/resolv.rb (Resolv::IPv4::Regex): make it only accept 0 to 255.
-	  [ruby-core:29501]
-
-Sun Apr 18 12:48:51 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* parse.y (parser_yylex): seems like a symbol-literal when spaces
-	  are unbalanced.  [ruby-core:29578]
-
-Sun Apr 18 12:32:03 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* parse.y (string_content): preserve cond_stack and cmdarg_stack.
-	  [ruby-core:29579]
-
-Sun Apr 18 05:50:58 2010  Aaron Patterson  <aaron@tenderlovemaking.com>
-
-	* ext/psych/lib/psych/visitors/yaml_tree.rb: defaulting binary string
-	  format to "literal" format.
-
-Sun Apr 18 02:13:59 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* lib/irb/ruby-lex.rb (identify_identifier): add '_' to the regexp.
-
-Sat Apr 17 23:21:15 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* configure.in: use AC_TRY_LINK instead of AC_TRY_COMPILE.
-	  On Solaris it can compile with signbit but can't link.
-
-Sat Apr 17 20:34:09 2010  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* test/ruby/envutil.rb: update Gem::ConfigMap to fake environment for
-	  tests.  Some test of rubygems had failed because envutil.rb changed
-	  only RbConfig::CONFIG but not Gem::ConfigMap.
-
-Sat Apr 17 20:31:08 2010  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* lib/irb/ruby-lex.rb (identify_identifier): allow multibyte character
-	  as identifier.  [ruby-core:27275]
-
-Sat Apr 17 09:19:27 2010  wanabe  <s.wanabe@gmail.com>
-
-	* compile.c (iseq_compile_each): fix splat condition in NODE_WHEN.
-	  [Bug #2226]
-
-Sat Apr 17 08:57:41 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* lib/net/smtp.rb (Net::SMTP#rcptto_list): continue when at least
-	  one RCPT is accepted.  based on a patch from Kero van Gelder at
-	  [ruby-core:26190].
-
-Sat Apr 17 07:43:55 2010  Kazuhiro NISHIYAMA  <zn@mbf.nifty.com>
-
-	* test/thread/test_queue.rb (TestQueue#grind): fix typos.
-
-Sat Apr 17 07:27:53 2010  Kazuhiro NISHIYAMA  <zn@mbf.nifty.com>
-
-	* NEWS: add Array#repeated_{combination,permutation} [Feature #2981]
-
-Sat Apr 17 05:30:22 2010  Aaron Patterson  <aaron@tenderlovemaking.com>
-
-	* ext/psych/lib/psych/core_ext.rb (yaml_as): supporting deprecated
-	  "yaml_as" method
-	* ext/syck/lib/syck/tag.rb: ditto
-
-Sat Apr 17 05:25:15 2010  Aaron Patterson  <aaron@tenderlovemaking.com>
-
-	* ext/psych/lib/psych/coder.rb (scalar): supporting deprecated methods
-	* ext/psych/lib/psych/deprecated.rb: supporting deprecated
-	  to_yaml_properties method
-
-Sat Apr 17 01:32:50 2010  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* io.c (rb_io_rewind, rb_io_eof): add rdoc.  based on a patch from
-	  Roger Pack in [ruby-core:26771] [Bug #2377].
-
-Fri Apr 16 23:42:56 2010  Masaki Suketa  <masaki.suketa@nifty.ne.jp>
-
-	* test/win32ole/test_folderitem2_invokeverb.rb (test_invokeverb):
-	  run test only when "Create Shortcut (&S)" menu is found.
-	  [ruby-core:29550] [Bug #1602]
-
-Fri Apr 16 21:52:16 2010  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* parse.y (string_content, etc): counts of CMDARG_PUSH and POP were
-	  inconsistent.  [ruby-core:22637]
-
-Fri Apr 16 21:27:57 2010  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* ext/bigdecimal/bigdecimal.c (BigDecimal_coerce): revert r23389,
-	  which not only is unnecessary but also causes the inconsistency of
-	  return type.  [ruby-core:25706] [Bug #2129]
-
-Fri Apr 16 20:05:24 2010  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* lib/thread.rb (Queue#push, #pop, SizedQueue#push, #pop): remove
-	  code that kicks waiting thread twice, which caused race and
-	  deadlock.  a patch from James M. Lawrence.  [ruby-core:25537]
-
-	* test/thread/test_queue.rb: added.
-
-Fri Apr 16 20:01:47 2010  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* .gitignore: updated.
-
-Fri Apr 16 16:51:14 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* tool/file2lastrev.rb (VCS::SVN::get_revisions.): remind about
-	  DOSISH, sometimes.
-
-Fri Apr 16 16:15:40 2010  Yukihiro Matsumoto  <matz@ruby-lang.org>
-
-	* array.c (rb_ary_repeated_permutation): new method added. a patch
-	  from Makoto Kishimoto in [ruby-core:29267]   [ruby-core:28724]
-
-	* array.c (rb_ary_repeated_combination): ditto.
-
-Thu Apr 15 22:41:47 2010  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* thread.c (rb_thread_priority, rb_thread_priority_set): fix rdoc.
-	  Lower-priority thread may run even if there are higher-priority
-	  threads.  See [ruby-dev:40977].
-
-Thu Apr 15 22:33:35 2010  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* lib/uri/ftp.rb (URI::FTP#set_path): added to correct handling of
-	  special case where path of ftp is relative.  This converts relative
-	  path to absolute one, because external representation of ftp path is
-	  relative and internal representation is absolute.  [ruby-core:24077]
-
-	* lib/uri/ftp.rb (URI::FTP#initialize): converts absolute to relative.
-
-	* lib/uri/generic.rb (URI::Generic#check_path): allow relative path
-	  when scheme is ftp.
-
-Thu Apr 15 21:54:39 2010  Tanaka Akira  <akr@fsij.org>
-
-	* tool/file2lastrev.rb: use backtick for ruby 1.8.
-
-Thu Apr 15 21:13:29 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* tool/file2lastrev.rb: this should run with ruby 1.8.
-
-Thu Apr 15 20:41:10 2010  Tanaka Akira  <akr@fsij.org>
-
-	* tool/file2lastrev.rb: make -q effective for files not version
-	  controlled.
-
-Thu Apr 15 14:50:19 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* vm.c (vm_backtrace_each): get rid of use of malloc from signal
-	  handler by using ruby_engine_name.  [ruby-core:29497]
-
-	* vm_eval.c (print_backtrace): file may be nil when segfaulted in
-	  very early stage.
-
-	* vm_dump.c (bugreport_backtrace): ditto.
-
-Thu Apr 15 11:51:49 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* common.mk (help): small fix.
-
-Wed Apr 14 22:09:28 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* lib/rexml/source.rb: force_encoding("UTF-8") when the input
-	  is already UTF-8. patched by Kouhei Sutou [ruby-core:23404]
-
-Wed Apr 14 18:23:00 2010  Kenta Murata  <mrkn@mrkn.jp>
-
-	* configure.in (signbit): signbit is a macro in C99.
-
-Wed Apr 14 17:56:06 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* io.c (io_shift_cbuf): should terminate.
-	  http://golf.shinh.org/p.rb?DECimal+number+to+BINary#Ruby
-
-Wed Apr 14 16:29:02 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* gc.c (GET_STACK_BOUNDS): fixed macro argument names.  a patch from
-	  Satoshi Shiba <shiba AT rvm.jp> at [ruby-dev:40973].
-
-	* gc.h (ruby_get_stack_grow_direction): fixed prototype.
-
-	* thread_pthread.c (get_stack, ruby_stack_overflowed_p): both side
-	  should be same type.  [Bug #3145]
-
-Wed Apr 14 15:58:11 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* string.c (rb_string_value_cstr): make NUL terminated if it is
-	  not done.
-
-Wed Apr 14 12:56:21 2010  Shugo Maeda  <shugo@ruby-lang.org>
-
-	* lib/net/imap (encode_utf7): encode & properly.  Thanks, Kengo
-	  Matsuyama.  [ruby-dev:38063]
-
-Wed Apr 14 11:39:26 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* ext/syck/lib/syck/basenode.rb (Syck::BaseNode#match_path): fixed
-	  library name.
-
-	* ext/syck/lib/yaml/syck.rb: split from ext/syck/lib/syck.rb for
-	  backward compatibility.
-
-Wed Apr 14 09:24:07 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* ext/nkf/nkf-utf8/nkf.c: Refix [nkf-bug:21393]. (explicit -X)
-
-Tue Apr 13 20:36:50 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* ext/nkf/nkf-utf8/nkf.c: Fix: Windows Codepages wrongly convert
-	  Halfwidth Katakana. [nkf-bug:21393]
-
-Tue Apr 13 15:00:45 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* random.c (make_seed_value): fix leading-zero-guard condition on
-	  bdigit is smaller than 32bit.
-
-Tue Apr 13 13:57:36 2010  Keiju Ishitsuka  <keiju@ruby-lang.org>
-
-	* lib/irb/completion.rb (CompletionProc): fix [ruby-dev:40953]
-	  [Bug #3126]. Thanks Kazuhiro NISHIYAMA.
-
-Tue Apr 13 09:32:12 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* transcode.c (transcode_loop): insert output the value when
-	  fallback hash has a related key. [ruby-dev:40540]
-	  [ruby-dev:40829] #3036
-
-	* transcode.c (rb_econv_prepare_opts): pass to newhash
-	  a value with the key :fallback.
-
-Tue Apr 13 00:12:04 2010  Tanaka Akira  <akr@fsij.org>
-
-	* random.c (rand_init): use the absolute value of seed to
-	  make srand(-2**40) portable with 32bit and 64bit.
-	  [ruby-core:29292](2)
-
-Mon Apr 12 22:48:47 2010  Tanaka Akira  <akr@fsij.org>
-
-	* enumerator.c (inspect_enumerator): don't raise for uninitialized
-	  enumerator.
-
-Mon Apr 12 21:47:41 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* LEGAL: separated the section for parse.c.  contributed by Paul
-	  Betteridge in [ruby-core:29472].
-
-Mon Apr 12 09:19:49 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* lib/fileutils.rb (fu_each_src_dest): ensure src is accessible.
-
-	* lib/fileutils.rb (fu_same): use File.identical? to get rid of
-	  exceptions.  [ruby-core:28141]
-
-	* lib/fileutils.rb (fu_have_st_ino): no longer used.
-
-	* lib/fileutils.rb (fu_have_st_ino): check if required method is
-	  defined, instead of platform name.
-
-Mon Apr 12 05:10:20 2010  Marc-Andre Lafortune  <ruby-core@marc-andre.ca>
-
-	* lib/matrix.rb: New method Matrix.build [ruby-core:28272]
-
-Mon Apr 12 03:45:25 2010  Marc-Andre Lafortune  <ruby-core@marc-andre.ca>
-
-	* lib/matrix.rb: Deprecate elements_to_{f/i/r}
-
-Mon Apr 12 03:30:29 2010  Marc-Andre Lafortune  <ruby-core@marc-andre.ca>
-
-	* lib/matrix.rb: Handle coercion errors by raising TypeErrors
-	  [ruby-core:26736]
-
-Mon Apr 12 00:51:21 2010  Kazuhiro NISHIYAMA  <zn@mbf.nifty.com>
-
-	* io.c (rb_io_getline_fast, rb_io_getline_1): fix ARGF.lineno
-	  behavior. [ruby-core:25205]
-
-	* test/ruby/test_argf.rb (TestArgf#test_lineno3): add a test for
-	  above.
-
-Sun Apr 11 23:25:17 2010  Yutaka Kanemoto  <kanemoto@ruby-lang.org>
-
-	* configure.in: can not load libraries if --with-opt-dir is used
-	  on AIX. [Bug #3107]
-
-Sun Apr 11 14:44:45 2010  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* lib/irb/ruby-lex.rb (RubyLex#getc): revert r10817, which caused
-	  regression for handling case when there is no newline at the end of
-	  file.  [ruby-core:28248]
-
-Sun Apr 11 12:08:49 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* encoding.c (enc_replicate): new encoding name must be valid
-	  c-string.  [ruby-dev:40954]
-
-Sun Apr 11 11:58:23 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* include/ruby/win32.h (ftruncate): rename to get rid of conflict
-	  with same name but non-LFS function on MinGW.  [ruby-core:24757]
-
-Sun Apr 11 10:33:34 2010  Eric Hodel  <drbrain@segment7.net>
-
-	* lib/rdoc:  Update to RDoc 2.5.3.  Includes r27288 and r27290.
-
-Sun Apr 11 09:31:39 2010  Aaron Patterson  <aaron@tenderlovemaking.com>
-
-	* test/syck/*: Moved test/yaml to test/syck since it's actually
-	  testing the syck YAML engine.
-
-Sun Apr 11 08:56:44 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* lib/rdoc/rdoc.rb (setup_output_dir): compare by Time#to_i.
-	  Cached created time doesn't have fractional times,
-	  but FileStat#mtime has; so rdoc almost always judged files
-	  are updated.
-
-Sun Apr 11 07:40:48 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* lib/rdoc/rdoc.rb (setup_output_dir): fix typo. [ruby-core:29415]
-
-Sun Apr 11 07:01:41 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* lib/uri/common.rb (decode_www_form_component): validate.
-	  [ruby-dev:40938]
-
-	* lib/uri/common.rb (decode_www_form): allow empty string.
-
-	* lib/uri/common.rb: fix nodoc for constant. [ruby-dev:40949]
-
-Sat Apr 10 21:26:22 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* lib/rdoc/markup/preprocess.rb (RDoc::Markup::PreProcess#handle):
-	  use File.binread to avoid locale dependency.
-
-Sat Apr 10 15:18:26 2010  Eric Hodel  <drbrain@segment7.net>
-
-	* lib/rdoc: Import RDoc 2.5.2
-	* lib/rdoc/parser/ruby.rb (RDoc::Parser::Ruby): Don't parse rdoc
-	  files, reverts r24976 in favor of include directive support in C
-	  parser.
-
-Sat Apr 10 13:14:22 2010  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* ext/openssl/ossl_ssl.c (Init_ossl_ssl): add SSLContext#ssl_timeout=,
-	  which allows net/https to specify timeout.  [ruby-core:24812]
-
-Sat Apr 10 07:36:13 2010  wanabe  <s.wanabe@gmail.com>
-
-	* vm_method.c (rb_add_method): clear attr.location before rb_ary_new3.
-	  a patch from Masaya TARUI in [Bug #3108]
-
-Sat Apr 10 05:27:26 2010  Aaron Patterson  <aaron@tenderlovemaking.com>
-
-	* ext/psych/lib/psych/deprecated.rb: implementing Psych.quick_emit and
-	  adding deprecation warnings.
-	* ext/psych/lib/psych/visitors/to_ruby.rb: supporting deprecated
-	  yaml_initialize api.
-	* ext/psych/lib/psych/visitors/yaml_tree.rb: supporting deprecated
-	  to_yaml api.
-
-Sat Apr 10 01:08:53 2010  Aaron Patterson  <aaron@tenderlovemaking.com>
-
-	* ext/psych/parser.c: parse raises a TypeError when nil is passed in.
-
-Sat Apr 10 00:01:51 2010  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* ext/pty/lib/expect.rb: preserve buffer read, instead of discard.
-	  based on a patch from Luiz Angelo Daros de Luca in
-	  [ruby-core:23464].
-
-Fri Apr  9 23:58:58 2010  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* ext/pty/lib/expect.rb: raise an error when argument is unexpected
-	  type.  based on a patch from Luiz Angelo Daros de Luca in
-	  [ruby-core:23464].
-
-Fri Apr  9 23:57:35 2010  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* ext/pty/lib/expect.rb: add rdoc.  based on a patch from Luiz Angelo
-	  Daros de Luca in [ruby-core:23464].
-
-Fri Apr  9 23:54:16 2010  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* lib/irb/init.rb, lib/irb/lc/help-message,
-	  lib/irb/lc/ja/help-message: add -w flag.  [ruby-core:24594]
-
-Fri Apr  9 23:51:45 2010  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* ext/socket/ipsocket.c (init_inetsock_internal),
-	  ext/socket/unixsocket.c (rsock_init_unixsock): check the result of
-	  listen(2).  based on a patch from Mike Pomraning.  [ruby-core:23698]
-
-Fri Apr  9 21:22:10 2010  Keiju Ishitsuka  <keiju@ruby-lang.org>
-
-	* lib/irb/completion.rb (CompletionProc): irb will be stuck with
-	  long variable name at completion. [Bug#1969]. refix [ruby-core:28366].
-
-Fri Apr  9 20:54:10 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* lib/uri/common.rb (decode_www_form): don't ignore leading '?'.
-	  [ruby-dev:40938]
-
-	* lib/uri/common.rb (decode_www_form): check whether argument is
-	  valid application/x-www-form-urlencoded data.
-
-Fri Apr  9 20:29:13 2010  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* dir.c (push_glob): clear up the previous commit (RB_GC_GUARD can
-	  precede the last reference).  [ruby-dev:40942]
-
-Fri Apr  9 20:05:05 2010  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* dir.c (push_glob): add RB_GC_GUARD to prevent str being free'ed.
-	  a patch from Masaya TARUI in [ruby-dev:40939].  [ruby-dev:40514]
-
-Fri Apr  9 10:53:00 2010  Kenta Murata  <mrkn@mrkn.jp>
-
-	* compile.c (iseq_compile_each): stop hiding, and freeze unpopped
-	  string nodes to allow method redefinition.  [ruby-dev:40641]
-
-Fri Apr  9 01:26:54 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* io.c (internal_{read,write}_func, rb_{read,write}_internal):
-	  preserve errno.  a patch from Takehiro Kubo in [ruby-core:29340].
-	  [ruby-core:28924]
-
-Fri Apr  9 01:12:07 2010  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* lib/irb/completion.rb (CompletionProc): calling the method "methods"
-	  may raise an exception.  [ruby-core:28366]
-
-Thu Apr  8 14:33:24 2010  URABE Shyouhei  <shyouhei@ruby-lang.org>
-
-	* configure.in: --disable-install-doc should prohibit doxygen.
-
-Thu Apr  8 14:23:51 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* include/ruby/win32.h: include errno.h before defining errnos.
-	  see [ruby-core:29314]
-
-Thu Apr  8 11:45:14 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* lib/yaml.rb: use Psych if only it is loaded already.
-
-	* lib/yaml.rb (YAML::EngineManager#yamler): set the result after
-	  successfully switched.
-
-Thu Apr  8 07:22:05 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* random.c (rand_init): ignore higher bits if all they are same as
-	  the lower sign bit.  [ruby-core:29292](2)
-
-Thu Apr  8 07:16:19 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* lib/irb/cmd/help.rb (IRB::ExtendCommand::Help#execute): use RI
-	  interactive mode if no argument.  [ruby-dev:39839]
-
-Wed Apr  8 02:33:55 2010  Marc-Andre Lafortune  <ruby-core@marc-andre.ca>
-
-	* array.c (rb_ary_permutation): Remove limitation for lengthy permutations
-	  [ruby-core:29240]
-
-	* test/ruby/test_array.rb: ditto
-
-Wed Apr  7 23:33:55 2010  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* misc/ruby-mode.el (ruby-mode-map): binded C-c C-c and C-c C-c C-u
-	  to comment-region and uncomment-region. Thanks Michael Klishin!
-	  [Feature #872] [ruby-core:20552]
-
-Wed Apr  7 21:44:14 2010  Tanaka Akira  <akr@fsij.org>
-
-	* time.c (ASCTIME): unused macro removed.
-
-Wed Apr  7 16:45:49 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* configure.in (Makefile): reverted r27244.
-
-Wed Apr  7 11:49:34 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* lib/rexml/quickpath.rb (REXML::QuickPath::predicate):
-	  fix regexp.
-
-Wed Apr  7 09:44:48 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* configure.in (Makefile): quote init-commands.
-
-	* configure.in (Makefile): `make ruby` builds ruby command
-	  even if RUBY_INSTALL_NAME is customized or it has extension.
-
-Wed Apr  7 03:28:27 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* lib/rdoc/rdoc.rb (RDoc#{initialize,setup_output_dir}):
-	  initialize @last_created and use it.
-
-Wed Apr  7 02:05:41 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* template/fake.rb.in: not define $extout to make target in cwd.
-
-Tue Apr  6 23:01:35 2010  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
-
-	* vm_core.h: Introduce UNINITIALIZED_VAR() macro.
-	* thread.c (do_select): Use UNINITIALIZED_VAR() instead FAKE_FD_ZERO().
-	  Also, remove FAKE_FD_ZERO completely. [Feature #3018]
-
-Tue Apr  6 14:53:17 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* include/ruby/win32.h: check definition existence before defining
-	  errno macros.
-
-	* win32/win32.c (errmap): define winsock errors mappings.
-	  these are VC++10 support. see [ruby-core:29278]
-
-Tue Apr  6 21:55:25 2010  Tanaka Akira  <akr@fsij.org>
-
-	* configure.in: test localtime(3) overflow.  [ruby-dev:40910]
-
-	* time.c (rb_gmtime_r): renamed from rb_gmtime.
-	  (rb_localtime_r): renamed from rb_localtime.
-	  (rb_localtime_r2): call rb_localtime_r and validate the result if
-	  there is overflow problem.
-	  (rb_gmtime_r2): call rb_gmtime_r and validate the result if there
-	  is overflow problem.
-
-Tue Apr  6 11:21:23 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* template/fake.rb.in: hooks for extconf.rb.
-
-Tue Apr  6 06:19:36 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* lib/rexml/text.rb (REXML::Text.check): comment out
-	  broken logic.
-
-Tue Apr  6 05:59:12 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* lib/rexml/parsers/baseparser.rb (LETTER, DIGIT):
-	  always use POSIX charclass.
-
-	* lib/rexml/parsers/baseparser.rb (NAMECHAR):
-	  remove duplicated range.
-
-	* lib/rexml/xmltokens.rb (NCNAME_STR, NAMECHAR): ditto.
-
-	* lib/rexml/parsers/xpathparser.rb (PathExpr): ditto.
-
-	* lib/rexml/text.rb (REXML::Text#initialize):
-	  initialize @parent.
-
-Mon Apr  5 19:54:58 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* re.c (make_regexp): use onig_new_with_source to keep
-	  sourcefile and sourceline.
-
-	* re.c (onig_new_with_source): copied from onig_new in
-	  regcomp.c for keep sourcefile and sourceline.
-
-Mon Apr  5 13:20:45 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* include/ruby/win32.h, win32/win32.c (EWOULDBLOCK): VC10 already
-	  defined EWOULDBLOCK.  based on a patch from Charlie Savage,
-	  see [ruby-core:29255]
-
-Mon Apr  5 13:10:35 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* ext/psych/lib/psych/core_ext.rb: remove before alias.
-
-	* ext/syck/lib/syck.rb: don't warn called by itself.
-
-Mon Apr  5 13:08:24 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* win32/mkexports.rb (each_export): VC10 support.
-	  a patch from Charlie Savage in [ruby-core:29254]
-
-Sun Apr  4 22:18:32 2010  Tanaka Akira  <akr@fsij.org>
-
-	* time.c (cmp): optimize for fixnums.
-	  (lt): use cmp.
-	  (gt): ditto.
-	  (le): ditto.
-	  (ge): ditto.
-	  (wlt): use wcmp.
-	  (wgt): ditto.
-	  (wle): ditto.
-	  (wge): ditto.
-	  (time_subsec): use wmod.
-
-Sun Apr  4 10:04:28 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* include/ruby/ruby.h: replace snprintf and vsnprintf by
-	  ruby_snprintf and ruby_vsnprintf. [ruby-dev:40909]
-
-	* configure.in: don't check snprintf(3) and vsnprintf(3).
-
-	* include/ruby/missing.h: don't declare snprintf and vsnprintf.
-
-	* include/ruby/ruby.h: include stdarg.h.
-
-	* sprintf.c: include vsnprintf.c
-
-	* vsnprintf.c: renamed from missing/vsnprintf.c.
-
-	* vsnprintf.c: remove useless ifdefs.
-
-	* win32/mkexports.rb: use ruby_snprintf and ruby_vsnprintf.
-
-Sun Apr  4 09:44:01 2010  Tanaka Akira  <akr@fsij.org>
-
-	* time.c (lt): call <=> instead of <.
-
-Sun Apr  4 06:46:16 2010  Aaron Patterson  <aaron@tenderlovemaking.com>
-
-	* lib/yaml: Moved to ext/syck/lib, Syck only uses Syck constant.
-	* lib/yaml.rb: Added an engine manager for choosing YAML engine.
-	* ext/syck/lib/syck/rubytypes.rb: squashed warnings when using Psych
-
-Sat Apr  3 22:47:51 2010  Tanaka Akira  <akr@fsij.org>
-
-	* time.c: don't define STRUCT_WIDEVAL.
-
-Sat Apr  3 18:15:02 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* lib/rdoc/rdoc.rb (RDoc#{setup,update}_output_dir): store mtimes
-	  per files in the flag file.
-
-	* lib/rdoc/rdoc.rb (RDoc#normalized_file_list): skip already
-	  processed and unmodified files.
-
-Sat Apr  3 15:09:30 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* common.mk (rdoc): no force-update, and add RDOCFLAGS.
-
-	* lib/rdoc/options.rb (RDoc#parse): no-force-update option.
-
-Sat Apr  3 10:51:10 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* random.c (random_rand): raise ArgumentError on nil, as the
-	  documentation implies.  [ruby-core:29075]
-
-	* random.c (rb_f_rand): mentioned the case of when max is nil.
-
-Sat Apr  3 06:56:11 2010  Marc-Andre Lafortune  <ruby-core@marc-andre.ca>
-
-	* array.c (rb_ary_product): Accept a block [ruby-core:29045]
-
-Sat Apr  3 04:46:00 2010  Tanaka Akira  <akr@fsij.org>
-
-	* tool/file2lastrev.rb (VCS#relative_to): path and @srcdir may have
-	  different relative-ness.
-
-Sat Apr  3 03:19:01 2010  Kazuhiro NISHIYAMA  <zn@mbf.nifty.com>
-
-	* lib/benchmark.rb (Benchmark::Tms#add): fix NameError.
-	  [ruby-dev:40906]
-
-	* test/benchmark/test_benchmark.rb: add a test for above.
-
-Sat Apr  3 01:50:02 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* lib/rdoc/parser/ruby.rb (RDoc#make_message): no empty lines.
-
-	* lib/rdoc/stats.rb (RDoc::Normal#print_file): send to stdout and
-	  flush always
-
-Sat Apr  3 00:03:11 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* lib/rdoc/class_module.rb (RDoc#merge): get rid of stack overflow.
-
-	* lib/rdoc/parser/c.rb (RDoc#handle_method): see source files in
-	  source directory.
-
-Fri Apr  2 22:13:38 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* lib/rdoc/rdoc.rb: reverted r27186 to add generators.
-
-Fri Apr  2 21:17:43 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* NEWS: added reverse_lookup option.
-
-Fri Apr  2 15:26:14 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* test/rdoc/test_rdoc_ri_driver.rb (with_dummy_pager): don't grasp
-	  the terminal.
-
-Fri Apr  2 14:43:18 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* lib/rdoc/rdoc.rb (RDoc::Generator): defer by autoload.
-
-	* lib/rdoc/generator/darkfish.rb: use normal library instead of
-	  gem.
-
-Fri Apr  2 14:26:26 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* lib/rdoc/rdoc.rb (RDoc::RDoc#parse_files): don't branch by
-	  RUBY_VERSION.  reapplied r24990.
-
-	* lib/rdoc/rdoc.rb (RDoc::RDoc#parse_files): emacs local variables
-	  are delimited by a semicolon.  supported Vim style.  reapplied
-	  r24988 with fixing a typo for shebang.
-
-Fri Apr  2 14:16:54 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* lib/rdoc/parser/ruby.rb (RDoc::Parser::Ruby): parse also rdoc
-	  files.  reapplied r24976.
-
-	* lib/rdoc/parser/c.rb: fixed a small error in the documentation.
-	  [ruby-core:24744]  reapplied r24395.
-
-	* lib/rdoc/parser.rb (RDoc::Parser.binary?): blksize may be nil
-	  and is irrelevant to whether a file is binary.  TAB and newlines
-	  would be usually considered to be included in text data.
-	  reapplied r23071 and r24297.
-
-Fri Apr  2 13:59:17 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* lib/rdoc/ri/paths.rb (RDoc::RI::Paths): Gem::Enable has been
-	  obsolete.  reapplied r24599.
-
-	* lib/rdoc/ri/paths.rb: follows $ridir.  reapplied r23554.
-
-	* lib/rdoc/ri/paths.rb (RDoc::HOMEDIR): expand_path deals with
-	  platform dependent environments.  reapplied r21312.
-
-Fri Apr  2 12:52:25 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* lib/rdoc/parser.rb (binary?): regression.
-
-Fri Apr  2 11:54:49 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* win32/win32.c (init_env): wrong calculation of the head of setenv
-	  string.  [ruby-core:29216]
-	  a patch from Heesob Park in [ruby-core:29218]
-
-Fri Apr  2 08:24:56 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* process.c (ruby_setsid): split from proc_setsid.
-
-	* process.c (proc_daemon): use EXIT_SUCCESS instead of magic number.
-
-Fri Apr  2 07:00:28 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* ext/dl/cptr.c (rb_dlptr_inspect): fix format specifiers.
-
-Fri Apr  2 05:38:17 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* include/ruby/ruby.h (InitVM): calls per-VM initialization in
-	  single VM, but does nothing in MVM.
-
-Fri Apr  2 02:56:56 2010  Marc-Andre Lafortune  <ruby-core@marc-andre.ca>
-
-	* lib/matrix.rb: New instance methods:
-	  empty? [ruby-core:26284], each, each_with_index [ruby-core:28400],
-	  conjugate, conj, imaginary, imag, real, real?, rectangular, rect
-	  [ruby-core:26285]
-
-	  Removed compare_by*, inspect_org, cf [ruby-core:26268]
-
-	  Matrix.empty: raise on negative sizes
-
-	  Matrix.determinant: raise on rectangular matrices [ruby-core:28271]
-
-Thu Apr  1 17:17:00 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* enc/trans/iso2022.trans: CP50221 supports 8bit JIS.
-
-Thu Apr  1 16:44:00 2010  Eric Hodel  <drbrain@segment7.net>
-
-	* lib/rdoc, test/rdoc: Imported RDoc 2.5
-
-Thu Apr  1 14:30:16 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* enc/utf_16{be,le}.c (utf16{be,le}_mbc_to_code): simplified.
-
-Thu Apr  1 14:07:51 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* util.c (BSD__hdtoa): don't use C99 macros. (FP_NORMAL etc)
-
-Thu Apr  1 13:30:12 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* sprintf.c (rb_str_format): support %a format. [ruby-dev:40650]
-
-	* missing/vsnprintf.c (BSD_vfprintf): ditto.
-
-	* missing/vsnprintf.c (cvt): ditto.
-
-	* util.c (BSD__hdtoa): added.  This is 2-clause BSDL licensed
-	  by David Schultz and from FreeBSD.
-
-	* LEGAL: add about hdtoa() in util.c.
-
-Thu Apr  1 13:24:12 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* object.c (rb_cstr_to_dbl): return 0.0 if hexadecimal and
-	  badcheck is FALSE: Float("0x1p+0") works, but "0x1p+0".to_f
-	  doesn't. [ruby-dev:40650]
-
-	* util.c (ruby_strtod): allow hexadecimal integers.
-
-Thu Apr  1 13:20:50 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* lib/scanf.rb: support %a format. [ruby-dev:40650]
-
-Thu Apr  1 12:04:10 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* include/ruby/ruby.h (PRE_TIMET_PREFIX): define if configure doesn't
-	  defines it.  [ruby-core:29190]
-
-Thu Apr  1 11:36:04 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* io.c (rb_io_initialize): fixed a rdoc miss that textmode and
-	  binmode flag explanation was reversed each other.  a patch from
-	  Heesob Park in [ruby-core:29166].
-
-Thu Apr  1 09:54:27 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* include/ruby/ruby.h (RUBY_{DEFAULT,NEVER}_FREE): added.
-	  [ruby-dev:40889]
-
-Thu Apr  1 04:55:08 2010  Tanaka Akira  <akr@fsij.org>
-
-	* time.c (rb_big_abs_find_minbit): fix handling the last word.
-
-Thu Apr  1 04:30:11 2010  Tanaka Akira  <akr@fsij.org>
-
-	* time.c (long_mul): overflow condition changed.
-	  (wi_mul): ditto.
-
-Wed Mar 31 23:33:29 2010  Tanaka Akira  <akr@fsij.org>
-
-	* time.c (long_mul): extracted from mul and avoid integer overflow.
-	  (wi_mul): extracted from wmul and avoid integer overflow.
-
-Wed Mar 31 21:30:38 2010  Tanaka Akira  <akr@fsij.org>
-
-	* time.c: less bignum allocations.
-
-	* strftime.c (rb_strftime_timespec): defined to avoid rational for
-	  nano second resolution time.
-
-Wed Mar 31 16:05:13 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* test/rake/test_{package_task,rules,task_manager}.rb: use
-	  temporary directories.
-
-Wed Mar 31 13:53:13 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* test/rubygems/gemutilities.rb (setup, teardown):
-	  Object#to_yaml must use syck on RubyGem.
-
-Wed Mar 31 06:57:14 2010  Tanaka Akira  <akr@fsij.org>
-
-	* time.c (timew2timespec): fix previous change.
-
-Wed Mar 31 00:32:19 2010  Tanaka Akira  <akr@fsij.org>
-
-	* time.c (wdivmod): renamed from wdivmodv.  fix neg/pos and pos/neg.
-	  (split_second): return number of seconds as wideval_t.
-	  (timet2wv): new function.
-	  (wv2timet): new function.
-	  (timet2wideval): removed.
-
-Tue Mar 30 22:24:19 2010  Tanaka Akira  <akr@fsij.org>
-
-	* time.c: use more polymorphic operations.
-
-Tue Mar 30 22:12:38 2010  Kazuhiro NISHIYAMA  <zn@mbf.nifty.com>
-
-	* NEWS: add URI.decode and URI.encode to Obsoleted methods,
-	  and fix typos. [ruby-dev:40852]
-
-	* NEWS: add Time#subsec.
-
-Tue Mar 30 22:07:12 2010  Tanaka Akira  <akr@fsij.org>
-
-	* time.c: reorder wide value implementation.
-
-Tue Mar 30 22:00:44 2010  Keiju Ishitsuka  <keiju@ruby-lang.org>
-
-	* lib/irb.rb: support [Feature#988], [ruby-core:21177].
-	* lib/irb/context.rb: fix Context#verbose?.
-
-Tue Mar 30 21:56:33 2010  Tanaka Akira  <akr@fsij.org>
-
-	* time.c: make wide value more polymorphic.
-
-Tue Mar 30 21:18:32 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* ext/psych/extconf.rb: install psych .so to not psych/ but direct.
-	  This prepends to install *.rb files to psych/psych.
-
-	* ext/psych/lib/psych.rb: require 'psych.so'.
-
-Tue Mar 30 20:55:14 2010  Tanaka Akira  <akr@fsij.org>
-
-	* time.c (w2v): renamed from w2xv.
-	  (v2w): renamed from xv2w.
-	  (rb_time_magnify): takes wideval_t.
-	  (rb_time_unmagnify): returns wideval_t.
-
-Tue Mar 30 19:46:00 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* ext/psych/lib: moved external library dependent files from lib.
-	  [ruby-core:29129]
-
-Tue Mar 30 18:25:52 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* file.c (rb_file_dirname): split from rb_file_s_dirname.
-
-	* load.c (rb_f_require_relative): use absolute path instead of
-	  expanded path.
-
-Tue Mar 30 13:57:08 2010  Akinori MUSHA  <knu@iDaemons.org>
-
-	* process.c (proc_daemon): Process.daemon should raise an error on
-	  failure regardless of whether the implementation uses daemon(3)
-	  or not. [ruby-dev:40832]
-
-Tue Mar 30 13:11:17 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* tool/file2lastrev.rb (VCS::GIT_SVN): removed because git-log can
-	  deal with git-svn repository faster than git-svn-info.
-
-	* tool/file2lastrev.rb (VCS#get_revisions): particular commands do
-	  not depend on instance.
-
-Tue Mar 30 08:55:50 2010  Aaron Patterson  <aaron@tenderlovemaking.com>
-
-	* ext/psych/extconf.rb: Making library detection more agnostic.
-
-Tue Mar 30 08:10:59 2010  Aaron Patterson  <aaron@tenderlovemaking.com>
-
-	* lib/psych.rb: Fix problem with empty and white-space only strings.
-	  Thanks Peter McLain!
-	* test/psych/test_psych.rb: tests for change.
-
-Tue Mar 30 05:31:39 2010  Aaron Patterson  <aaron@tenderlovemaking.com>
-
-	* lib/psych.rb: documentation updates.  Thanks Peter McLain!
-	* lib/psych/{coder,tree_builder}.rb: ditto
-
-Tue Mar 30 03:56:13 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* ext/psych/{emitter,parser,psych}.c: move variable
-	  declaration to the first of the block.
-
-Mon Mar 29 21:47:44 2010  Akinori MUSHA  <knu@iDaemons.org>
-
-	* prelude.rb, .document: Stuff in prelude.rb should be documented
-	  as well.
-
-Mon Mar 29 20:23:05 2010  Keiju Ishitsuka  <keiju@ruby-lang.org>
-
-	* lib/matrix.rb(Vector#each2, Vector#collect2): add type check for
-	  Integer[Bug #2495].
-
-Mon Mar 29 19:45:09 2010  Tanaka Akira  <akr@fsij.org>
-
-	* time.c: wide value condition changed.
-
-Mon Mar 29 18:10:03 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* lib/optparse.rb (Numeric): accept rationals.
-
-Mon Mar 29 15:10:39 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* lib/tempfile.rb (Tempfile#open): re-open with same mode and
-	  options as initialize.
-
-Mon Mar 29 09:16:45 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* random.c: change include order; ruby.h should be at first.
-
-Mon Mar 29 06:47:25 2010  Aaron Patterson  <aaron@tenderlovemaking.com>
-
-	* ext/psych/*: importing Psych to trunk
-	* test/psych/*: ditto
-	* lib/psych/*: ditto
-
-Sun Mar 28 10:03:51 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* lib/scanf.rb: fix max width modifier for %f.
-
-Sun Mar 28 10:35:45 2010  Ryan Davis  <ryand-ruby@zenspider.com>
-
-	* lib/minitest/*.rb: Imported minitest 1.6.0 r5717.
-	* test/minitest/*.rb: ditto.
-
-Sun Mar 28 10:12:28 2010  Tanaka Akira  <akr@fsij.org>
-
-	* time.c (rb_time_magnify): fix for LP64.
-
-Sun Mar 28 09:28:33 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* lib/scanf.rb: fix %[egEFG] isn't accept.
-
-Sun Mar 28 09:53:02 2010  Tanaka Akira  <akr@fsij.org>
-
-	* time.c: rename small integer specialization related identifiers.
-
-Sun Mar 28 08:20:37 2010  Tanaka Akira  <akr@fsij.org>
-
-	* time.c (weq): specialize for small integer.
-	  (wne): ditto.
-	  (wlt): ditto.
-	  (wgt): ditto.
-	  (wle): ditto.
-	  (wge): ditto.
-	  (rb_time_magnify): ditto.
-	  (rb_time_unmagnify): ditto.
-	  (rb_time_unmagnify_to_float): new function to avoid rational for
-	  Time#to_f and Time#-.
-
-Sun Mar 28 07:12:41 2010  Tanaka Akira  <akr@fsij.org>
-
-	* time.c (mul): condition refined.
-
-Sun Mar 28 02:14:13 2010  Tanaka Akira  <akr@fsij.org>
-
-	* time.c: fix previous commit.
-
-Sat Mar 27 23:17:52 2010  Tanaka Akira  <akr@fsij.org>
-
-	* time.c: use 64bit arithmetic even on platforms with 32bit VALUE.
-
-Fri Mar 26 23:52:07 2010  wanabe  <s.wanabe@gmail.com>
-
-	* NEWS: add Thread#add_trace_func and Thread#set_trace_func.
-
-Fri Mar 26 22:58:10 2010  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* ext/openssl/ossl_x509store.c (ossl_x509store_initialize): initialize
-	  store->ex_data.sk.  a patch from Christian Holtje in
-	  [ruby-core:28907].  [ruby-core:23971] [ruby-core:18121]
-
-Fri Mar 26 19:55:41 2010  Akinori MUSHA  <knu@iDaemons.org>
-
-	* Makefile.in (DOXYGEN): Define a missing variable DOXYGEN.  Build
-	  has been failing when doxygen(1) is found by configure but the
-	  variable is not defined by the system and make(1) does not allow
-	  an empty command. ("@$(DOXYGEN)" was the cause)
-
-Fri Mar 26 19:28:03 2010  Shugo Maeda  <shugo@ruby-lang.org>
-
-	* test/ruby/test_hash.rb (test_recursive_key): recursive keys are
-	  permitted now.  [ruby-dev:40735]
-
-Fri Mar 26 12:36:10 2010  Aaron Patterson  <aaron@tenderlovemaking.com>
-
-	* lib/yaml/basenode.rb: deprecating YPath methods
-
-	* lib/yaml/stream.rb: deprecating YAML::Stream#edit
-
-Fri Mar 26 12:29:28 2010  Aaron Patterson  <aaron@tenderlovemaking.com>
-
-	* lib/yaml/encoding.rb: YAML.encode, YAML.decode are deprecated.
-
-	* lib/yaml/stringio.rb: yaml/stringio.rb is deprecated.
-
-	* lib/yaml/ypath.rb: YAML::YPath is deprecated.
-
-Fri Mar 26 04:52:19 2010  Hidetoshi NAGAI  <nagai@ai.kyutech.ac.jp>
-
-	* ext/tk/extconf.rb: fix [ruby-core:28901] [Bug #2997].
-	  Thanks, Michael Graff.
-
-	* ext/tk/tcltklib.c: use xfree() for memories allocated by ALLOC().
-
-	* ext/tk/tkutil/tkutil.c: ditto.
-
-	* ext/tk/lib/tkextlib/version.rb: forgot updating.
-
-Thu Mar 25 23:53:22 2010  wanabe  <s.wanabe@gmail.com>
-
-	* thread.c (thread_reset_event_flags): set flags to thread.  [Bug #693]
-
-Thu Mar 25 23:17:16 2010  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* file.c (rb_get_path_check): prefer #to_path over #to_str.  a patch
-	  originally written by me, and modified by Nobuyoshi Nakada.
-	  [ruby-core:24257]
-
-Thu Mar 25 18:10:08 2010  Kazuhiro NISHIYAMA  <zn@mbf.nifty.com>
-
-	* NEWS: Array#{uniq,uniq!} can take a block. see [ruby-dev:37998]
-
-Thu Mar 25 17:21:49 2010  Kazuhiro NISHIYAMA  <zn@mbf.nifty.com>
-
-	* NEWS: add IO#autoclose=, IO#autoclose?, IO#codepoints,
-	  IO#each_codepoint.
-
-Thu Mar 25 14:50:00 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* win32/win32.c (rb_w32_{read,write}): fix handle leaks.  based on
-	  a patch from Heesob Park in [ruby-core:28919].  [ruby-core:28833]
-
-Thu Mar 25 12:37:37 2010  Kazuhiro NISHIYAMA  <zn@mbf.nifty.com>
-
-	* NEWS: add Kernel#singleton_class.
-
-Thu Mar 25 11:34:00 2010  Kenta Murata  <mrkn@mrkn.jp>
-
-	* bignum.c, node.h, strftime.c, enc/trans/utf8_mac.trans:
-	  added explicit casts for suppressing warnings.
-
-Thu Mar 25 11:34:00 2010  Kenta Murata  <mrkn@mrkn.jp>
-
-	* test/ruby/test_dir_m17n.rb: HFS+ escapes invalid byte sequences of
-	  filenames.
-
-Thu Mar 25 05:44:31 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* configure.in (ruby_version): needs runnable CPP.
-
-Thu Mar 25 04:42:19 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* tool/make-snapshot (package): take a breath for HP-UX make
-	  [ruby-core:28938].
-
-	* tool/make-snapshot (Dir.mktmpdir): for 1.8.6 backward compatibility.
-
-	* tool/make-snapshot (package): $: no longer contains ".", in trunk.
-
-Thu Mar 25 03:52:45 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* ext/iconv/charset_alias.rb: update of URL.  [ruby-dev:38360]
-
-Wed Mar 24 23:43:40 2010  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* thread.c (thread_create_core): let new thread inherit RUBY_EVENT_VM
-	  of event_flags.  [ruby-core:25191]
-
-	* thread.c (rb_threadptr_exec_event_hooks): delete RUBY_EVENT_VM if
-	  all event_hooks are removed.
-
-Wed Mar 24 22:58:02 2010  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* configure.in: revert the previous commit, which seemed to break make
-	  install.  The files of standard libraries are directly installed to
-	  $(PREFIX)/lib/ruby instead of $(PREFIX)/lib/ruby/1.9.1
-
-Wed Mar 24 18:16:08 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* configure.in (LDSHARED, CPP): keep $(CC).  [ruby-core:28912]
-
-Wed Mar 24 14:33:56 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* win32/win32.c (rb_w32_read): limit read size to 16KB if the file
-	  seems to be console.  [ruby-core:28902]
-
-Wed Mar 24 10:18:12 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* file.c (file_expand_path): set length of string before calling
-	  rb_enc_check because rb_enc_check scans its content.
-	  This prevents warnings by valgrind.
-
-Tue Mar 23 23:58:51 2010  James Edward Gray II  <jeg2@ruby-lang.org>
-
-	* lib/csv.rb: Incorporating the fixes from the recent
-	  FasterCSV releases:  1.5.2 and 1.5.3.  New parser
-	  by Tim Elliott.  [ruby-core:25038]
-
-Tue Mar 23 18:35:46 2010  Shugo Maeda  <shugo@ruby-lang.org>
-
-	* object.c (rb_obj_singleton_class): new method
-	  Kernel#singleton_class.  [ruby-core:21702]
-
-Tue Mar 23 01:13:59 2010  Tanaka Akira  <akr@fsij.org>
-
-	* ext/socket: use rsock_ prefix for internal initialization functions.
-
-Mon Mar 22 20:32:22 2010  wanabe  <s.wanabe@gmail.com>
-
-	* proc.c (rb_method_location): return attr's location if it is setup.
-	  [Feature #2084]
-
-	* NEWS: follow above.
-
-	* vm_method.c (rb_add_method): save attr's location.
-
-	* gc.c (mark_method_entry): mark attr's location.
-
-	* method.h (rb_method_definition_t): add member to save attr's location.
-
-	* vm_eval.c (vm_call0): follow above.
-
-	* vm_insnhelper.c (vm_call_method): ditto.
-
-	* vm_method.c (rb_method_definition_eq): ditto.
-
-Mon Mar 22 19:31:06 2010  Tadayoshi Funaba  <tadf@dotrb.org>
-
-	* lib/date.rb (Date#>>): fixed.  [ruby-core:28011]
-
-Mon Mar 22 18:01:13 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* configure.in (RMDIRS): use rmdir -p if possible.
-
-	* Makefile.in ({dist,real}clean-ext): fix for removing ext
-	  directories.
-
-Mon Mar 22 09:06:10 2010  Tanaka Akira  <akr@fsij.org>
-
-	* ext/socket/.document: extracted from ext/.document.
-
-Mon Mar 22 00:50:33 2010  Tanaka Akira  <akr@fsij.org>
-
-	* ext/socket/rubysocket.h (rsock_revlookup_flag): declared.
-
-Mon Mar 22 00:01:24 2010  Alexander Zavorine  <alexandre.zavorine@nokia.com>
-
-	* symbian/setup (config.h): RUBY_EXEC_PREFIX defined.
-
-Sun Mar 21 00:46:29 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* lib/uri/common.rb (URI.encode_www_form_component):
-	  convert strings of HTML5 ASCII incompatible encoding
-	  to UTF-8.
-
-	* lib/uri/common.rb (URI.encode_www_form_component):
-	  "\x83\x41" of Shift_JIS should be encoded as "%83A".
-	  This follows real implementations.
-
-	* lib/uri/common.rb (URI.decode_www_form_component):
-	  use given encoding for force_encoding. [ruby-dev:40721]
-
-Sun Mar 21 21:09:17 2010  Tanaka Akira  <akr@fsij.org>
-
-	* lib/resolv-replace.rb: specify super class for rdoc.
-
-	* lib/ipaddr.rb: ditto.
-
-Sun Mar 21 19:52:27 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* io.c (rb_io_initialize): add autoclose argument to control close
-	  at finalization.  [ruby-core:26222]
-
-	* io.c (rb_io_autoclose_p, rb_io_set_autoclose): new methods.
-
-Sun Mar 21 19:50:04 2010  Tanaka Akira  <akr@fsij.org>
-
-	* ext/socket: make sources rdoc friendly.
-
-Sun Mar 21 17:57:49 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* io.c (IO_RBUF_CAPA_FOR): use large buffer as cbuf if readconv is
-	  needed for performance improvement.  based on a patch by Roger Pack
-	  in [ruby-core:28163].  [ruby-core:28162]
-
-Sun Mar 21 17:14:49 2010  Tanaka Akira  <akr@fsij.org>
-
-	* tool/transcode-tblgen.rb: reuse hash object.
-
-Sun Mar 21 12:32:39 2010  Tanaka Akira  <akr@fsij.org>
-
-	* tool/transcode-tblgen.rb (transcode_compile_tree): make
-	  valid_encoding mandatory unless from_encoding is registered in
-	  ValidEncoding.
-	  (transcode_tbl_only): ditto.
-	  (transcode_tblgen): ditto.
-	  (ValidEncoding): new function.
-
-	* enc/trans/escape.trans: specify valid_encoding.
-
-	* enc/trans/emoji_sjis_docomo.trans: ditto.
-
-	* enc/trans/emoji.trans: ditto.
-
-	* enc/trans/emoji_iso2022_kddi.trans: ditto.
-
-	* enc/trans/big5.trans: ditto.
-
-	* enc/trans/emoji_sjis_softbank.trans: ditto.
-
-	* enc/trans/emoji_sjis_kddi.trans: ditto.
-
-	* enc/trans/chinese.trans: use ValidEncoding() instead of
-	  ValidEncoding[].
-
-Sun Mar 21 09:43:01 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* io.c (IO_[CRW]BUF_CAPA_MIN): replaced magic numbers.
-
-Sun Mar 21 09:22:10 2010  Tanaka Akira  <akr@fsij.org>
-
-	* object.c (rb_obj_hash): use LONG2FIX to avoid Bignum allocation.
-
-Sat Mar 20 22:51:46 2010  Tanaka Akira  <akr@fsij.org>
-
-	* string.c (rb_str_sum): use UCHAR_MAX.
-
-Sat Mar 20 19:16:42 2010  Tanaka Akira  <akr@fsij.org>
-
-	* tool/transcode-tblgen.rb (ActionMap.unambiguous_action): use
-	  Array#delete.
-	  (ActionMap.merge2): defined.
-	  (ActionMap::PostMemo): removed.
-	  (transcode_compile_tree): use ActionMap.merge2.
-
-Sat Mar 20 13:26:09 2010  Tanaka Akira  <akr@fsij.org>
-
-	* array.c (rb_ary_uniq_bang): the array is already unique if the
-	  length is zero or one.
-	  (rb_ary_uniq): ditto.
-
-Sat Mar 20 12:30:54 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* lib: fixed typo.  a patch by Sho Hashimoto in [ruby-dev:40716].
-
-Sat Mar 20 11:32:18 2010  Tanaka Akira  <akr@fsij.org>
-
-	* tool/transcode-tblgen.rb (each_firstbyte_range): tuned for less
-	  method calls.
-
-Sat Mar 20 00:59:50 2010  wanabe  <s.wanabe@gmail.com>
-
-	* ext/dl/lib/dl/pack.rb (DL#pack): allow LLP64.
-
-Fri Mar 19 05:26:31 2010  Tanaka Akira  <akr@fsij.org>
-
-	* string.c (rb_str_sum): don't call method for each byte.
-
-Thu Mar 18 21:24:21 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* Makefile.in (miniruby): link $(NORMALMAINOBJ).
-
-Thu Mar 18 19:52:27 2010  Tanaka Akira  <akr@fsij.org>
-
-	* tool/transcode-tblgen.rb: scan singleton mappings sequentially.
-
-Thu Mar 18 06:28:32 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* configure.in (RUBY_EXEC_PREFIX): added to config.h.
-
-	* ruby.c (ruby_init_loadpath_safe): TMP_RUBY_PREFIX should be
-	  exec_prefix, not rubylibprefix.  [ruby-core:28718]
-
-	* version.c (RUBY_LIB_PREFIX): fallback to RUBY_EXEC_PREFIX.
-
-Thu Mar 18 05:58:27 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* ext/bigdecimal/bigdecimal.c (BigDecimal_{to_i,mod,divmod,div2}):
-	  removed unused variables.
-
-Thu Mar 18 04:40:56 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* parse.y (rb_intern3): get rid of type-punning cast.
-
-Thu Mar 18 02:29:42 2010  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* compile.c (iseq_build_body): add mark to jump table hash of case.
-
-Thu Mar 18 00:58:27 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* util.c (ruby_strtod): Add support for Hexadecimal
-	  floating-point expression [ruby-dev:40650] #2969
-
-Thu Mar 18 00:00:58 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* lib/uri/common.rb (URI.{en,de}code_www_form_component):
-	  renamed from URI.{en,de}code_www_component. [ruby-dev:40672]
-
-	* lib/uri/common.rb (URI.encode_www_form_component): %-encoded
-	  element should have always two hex.
-
-	* lib/uri/common.rb (URI.encode_www_form_component):
-	  better treatment for ASCII incompatible encodings and
-	  encodings whose lead byte may use 7bit.
-
-	* lib/uri/common.rb (URI.decode_www_form_component): add %20.
-
-	* lib/uri/common.rb (URI.decode_www_form_component): add
-	  result's encoding as 2nd argument.
-
-	* lib/uri/common.rb (URI.decode_www_form): added.
-
-Wed Mar 17 16:25:53 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* hash.c (rb_hash_aset): allow recursive key.  [ruby-core:24648]
-
-Wed Mar 17 06:39:59 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* ruby.h (rb_warning, rb_sys_warning): fixed typo in rdoc.
-	  [ruby-core:28696]
-
-Wed Mar 17 02:29:46 2010  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* compile.c, iseq.c, ruby.c, vm.c, vm_core.h, vm_eval.c: add absolute
-	  path field into rb_iseq_t.  The field contains a string representing
-	  a path to corresponding source file. or nil when the iseq is created
-	  from -e, stdin, eval, etc.  This field is used for require_relative.
-	  [ruby-dev:40004]
-
-	* load.c (rb_f_require_relative): add C implementation of
-	  require_relative.
-
-	* prelude.rb (require_relative): get rid of Ruby implementation of
-	  require_relative.
-
-Wed Mar 17 01:24:01 2010  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* parse.y (rb_intern3): prohibit Symbol with an invalid encoding.
-	  [ruby-core:24621]
-
-	* test/ruby/test_m17n_comb.rb: modify a test for above.
-
-Tue Mar 16 22:51:11 2010  Tanaka Akira  <akr@fsij.org>
-
-	* tool/transcode-tblgen.rb: specialize for singleton mappings.
-
-Tue Mar 16 20:13:00 2010  Kenta Murata  <mrkn@mrkn.jp>
-
-	* enc/trans/emoji.trans: added codepoints leading 0xf4 into
-	  nomap_table.
-
-Tue Mar 16 17:33:30 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* ext/bigdecimal/bigdecimal.c (VpCtoV): keep e's sign.
-	  When e doesn't over flow e * BASE_FIG but overflow e * 10,
-	  e will overflow.
-
-Tue Mar 16 17:18:44 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* include/ruby/encoding.h (rb_str_conv_enc_opts): missing prototype.
-
-Tue Mar 16 15:20:13 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* ext/tmpdir: split from lib/tmpdir.rb.
-
-	* win32/win32.c (rb_w32_system_tmpdir): extracted from init_env.
-
-	* win32/win32.c (rb_w32_getcwd): removed duplicated code.
-
-Tue Mar 16 14:06:13 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* include/ruby/encoding.h (ENC_TO_ENCINDEX): suppress warnings.
-
-Tue Mar 16 14:03:24 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* configure.in (RSHIFT): parenthesize the argument of cast instead
-	  of the result.
-
-Tue Mar 16 11:23:42 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* file.c (file_expand_path): ignore dname if it has different
-	  drive letter or UNC.
-
-Tue Mar 16 07:16:56 2010  Tanaka Akira  <akr@fsij.org>
-
-	* tool/transcode-tblgen.rb: redundant loop removed.
-
-Tue Mar 16 07:01:43 2010  Tanaka Akira  <akr@fsij.org>
-
-	* tool/transcode-tblgen.rb: refactored to use tree as memo key.
-
-Tue Mar 16 04:05:13 2010  Tanaka Akira  <akr@fsij.org>
-
-	* tool/transcode-tblgen.rb: more info in generating macro names.
-
-Mon Mar 15 21:58:03 2010  Tanaka Akira  <akr@fsij.org>
-
-	* tool/transcode-tblgen.rb: ActionMap#each_firstbyte inlined.
-
-Mon Mar 15 21:22:49 2010  Tanaka Akira  <akr@fsij.org>
-
-	* tool/transcode-tblgen.rb (transcode_tblgen): add valid_encoding
-	  optional argument.
-
-	* enc/trans/single_byte.trans use valid_encoding argument for
-	  transcode_tblgen.
-
-	* enc/trans/chinese.trans: ditto.
-
-Mon Mar 15 18:33:36 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* random.c (default_rand): removed initial buffer.
-
-	* random.c (Init_RandomSeed): initialize seed of default random.
-
-	* random.c (Init_RandomSeed2): turn the seed to Bignum object.
-
-Mon Mar 15 17:28:30 2010  Yukihiro Matsumoto  <matz@ruby-lang.org>
-
-	* io.c (rb_io_print): RDoc update.  a patch from Daniel Kelley
-	  in [ruby-core:28643].
-
-Mon Mar 15 14:06:07 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* random.c (next_state): no initialization here.
-
-	* random.c (default_mt): always return initialized MT.
-
-Mon Mar 15 11:49:48 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* random.c (rb_reset_random_seed): set seed in this.
-	  [ruby-core:28655]
-
-Mon Mar 15 10:26:02 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* ext/nkf/nkf-utf8/nkf.c: import latest nkf. [master 9306cb0]
-	  this also fixes [ruby-dev:40607]
-
-Mon Mar 15 09:34:17 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* lib/uri/common.rb (URI.encode_www_component):
-	  call str.to_s at first.
-
-Mon Mar 15 09:36:22 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* symbian/README.SYMBIAN: fixed broken patch and converted to
-	  unified diff.
-
-Mon Mar 15 07:51:05 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* file.c (Init_File): do not define File::ALT_SEPARATOR on cygwin.
-
-Mon Mar 15 07:41:00 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* file.c (realpath_rec): use same cache.
-
-	* file.c (realpath_internal): regulate separators in prefix.
-	  [ruby-core:28653]
-
-	* file.c (FILE_ALT_SEPARATOR): separated condition.
-
-Mon Mar 15 04:41:25 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* io.c (rb_io_each_codepoint): read directly when readconv is
-	  needed but internal encoding is not set.  [ruby-core:28650]
-
-Mon Mar 15 04:18:31 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* tool/file2lastrev.rb (VCS::{SVN,GIT}#get_revisions):
-	  use block argument 'path' to get the path given by super.
-
-Mon Mar 15 02:43:59 2010  Tanaka Akira  <akr@fsij.org>
-
-	* tool/transcode-tblgen.rb (Action#hash): defined.
-	  (Action#eql?): ditto.
-	  (Action#==): ditto.
-
-Mon Mar 15 01:52:46 2010  Tanaka Akira  <akr@fsij.org>
-
-	* tool/transcode-tblgen.rb: refactored.
-
-Mon Mar 15 01:18:31 2010  Alexander Zavorine  <alexandre.zavorine@nokia.com>
-
-	* symbian/setup (*.pkg): Ruby Core installation separated from standard extensions.
-
-	* symbian/configure.bat: ditto.
-
-	* symbian/README.SYMBIAN: ditto.
-
-	* symbian/setup (config.h): support for 2nd internal drive added.
-
-Mon Mar 15 00:11:23 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* tool/file2lastrev.rb (VCS::GIT_SVN#get_revisions) :
-	  use block argument 'path' to get the path given by super.
-
-	* tool/file2lastrev.rb (VCS::GIT#get_revisions):
-	  use double quotes for Windows.
-	  patched by Vladimir Sizikov [ruby-core:28651]
-
-Sun Mar 14 22:38:31 2010  Tanaka Akira  <akr@fsij.org>
-
-	* tool/transcode-tblgen.rb: consider valid_encoding for max_input.
-
-Sun Mar 14 15:46:09 2010  Tanaka Akira  <akr@fsij.org>
-
-	* enc/trans/emoji.trans: fix nomap_table.
-
-Sun Mar 14 09:50:03 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* compile.c (insn_data_to_s_detail), iseq.c (insn_operand_intern):
-	  fixed format specifiers.
-
-Sun Mar 14 07:20:17 2010  Yukihiro Matsumoto  <matz@ruby-lang.org>
-
-	* file.c (EXPAND_PATH_BUFFER): make it back to usascii, to prevent
-	  infinite loop on some platform. [ruby-dev:40629]
-
-Sun Mar 14 02:40:38 2010  Tanaka Akira  <akr@fsij.org>
-
-	* tool/transcode-tblgen.rb: reject ambiguous mapping.
-
-	* enc/trans/single_byte.trans: remove ambiguous mapping such as
-	  \xD6 -> U+05F2 and \xD6\xC7 -> U+FB1F in Windows-1255
-
-Sat Mar 13 23:48:27 2010  Yukihiro Matsumoto  <matz@ruby-lang.org>
-
-	* file.c (file_expand_path): should not just copy the encoding
-	  from fname.  [ruby-core:28635]
-
-	* file.c (EXPAND_PATH_BUFFER): set filesystem_encoding, not
-	  usascii for path buffer.
-
-Sat Mar 13 17:48:43 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* tool/file2lastrev.rb: refactored.  fixed changed revision of git.
-
-Sat Mar 13 15:44:20 2010  Yukihiro Matsumoto  <matz@ruby-lang.org>
-
-	* io.c (rb_io_print): should not print field separator at the end
-	  of arguments.  [ruby-talk:358633]
-
-Sat Mar 13 14:49:55 2010  Yukihiro Matsumoto  <matz@ruby-lang.org>
-
-	* enum.c (enum_join): remove Enumerable#join. [ruby-core:24786]
-
-	* array.c (ary_join_1): use #to_ary to detect recursive array.
-
-Sat Mar 13 12:26:13 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* include/ruby/io.h (MakeOpenFile): finalize fptr to get rid of
-	  memory leak.
-
-Sat Mar 13 11:14:26 2010  Shugo Maeda  <shugo@ruby-lang.org>
-
-	* load.c (rb_get_expanded_load_path): expand paths if any item in $:
-	  is not a string.
-
-Sat Mar 13 10:16:32 2010  Shugo Maeda  <shugo@ruby-lang.org>
-
-	* load.c (rb_get_expanded_load_path): does not expand paths if all
-	  the items in $: are absolute paths.  [ruby-core:28113]
-
-Sat Mar 13 10:03:52 2010  Hidetoshi NAGAI  <nagai@ai.kyutech.ac.jp>
-
-	* ext/tk/extconf.rb: fix [Bug #2840] Tk doesn't built in mingw.
-
-Sat Mar 13 03:24:15 2010  Tanaka Akira  <akr@fsij.org>
-
-	* tool/transcode-tblgen.rb: show consumed time at last.
-
-Sat Mar 13 00:44:20 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* file.c (rb_file_s_basename): check encoding of suffix.
-
-Sat Mar 13 00:11:05 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* ruby.c (ruby_init_loadpath_safe): mark initial load paths.
-
-	* gem_prelude.rb (push_all_highest_version_gems_on_load_path):
-	  search insertion position by initial load path mark.
-
-	* lib/rubygems.rb (Gem.load_path_insert_index): ditto.
-
-Fri Mar 12 21:34:00 2010  Kenta Murata  <mrkn@mrkn.jp>
-
-	* NEWS: emoji encodings.
-
-Fri Mar 12 17:14:12 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* lib/uri/common.rb (URI.encode_www_form): new method to
-	  generate URL-encoded form data. [ruby-dev:39246]
-
-	* lib/uri/common.rb (URI.encode_www_component,
-	  URI.decode_www_component): new method for encode/decode
-	  a name/value of HTML form.
-
-Fri Mar 12 17:36:35 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* lib/webrick/httpservlet/cgihandler.rb
-	  (WEBrick::HTTPServlet::CGIHandler#do_GET):
-	  set binary mode for tempfile.
-	  http://pc12.2ch.net/test/read.cgi/tech/1265467681/286
-
-Fri Mar 12 13:52:00 2010  Kenta Murata  <mrkn@mrkn.jp>
-
-	* tool/compile_prelude.rb: TMP_RUBY_PREFIX should replace
-	  rubylibprefix but not prefix.
-
-Fri Mar 12 09:43:11 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* complex.c (f_signbit): remove condition for signbit because
-	  all platforms have signbit from r26871.
-
-Fri Mar 12 07:25:16 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* win32/win32.c (init_env): get rid of alloca() for outer string.
-
-Fri Mar 12 07:17:15 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* ext/racc/cparse/cparse.c: suppressed warnings for shortening on
-	  platforms where pointer is bigger than int.
-
-Fri Mar 12 07:15:08 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* ruby.c (ruby_init_loadpath_safe, ruby_init_gems): set and remove
-	  TMP_RUBY_PREFIX.
-
-	* variable.c (rb_const_remove): new function.
-
-	* tool/compile_prelude.rb: split each preludes.
-
-Fri Mar 12 07:09:20 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* Makefile.in (config.status): setup MINIRUBY environment for
-	  cross-compiling.
-
-Fri Mar 12 06:48:58 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* ext/tk/extconf.rb: log() is built-in in some compilers and needs
-	  proper declaration.
-
-Fri Mar 12 06:37:13 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* sample/timeout.rb: split from lib/timeout.rb.
-
-Thu Mar 11 22:35:27 2010  Tanaka Akira  <akr@fsij.org>
-
-	* time.c (time_round): new method Time#round.  [ruby-dev:40595]
-
-Thu Mar 11 17:31:59 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* transcode.c (str_transcode0): confirm the code range.
-
-Thu Mar 11 12:14:17 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* missing/signbit.c: added.
-
-Thu Mar 11 11:16:33 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* configure.in: check if target_archs has changed.
-
-Thu Mar 11 01:33:30 2010  wanabe  <s.wanabe@gmail.com>
-
-	* win32/win32.c (signbit): allow x64.
-
-Thu Mar 11 01:04:48 2010  Shugo Maeda  <shugo@ruby-lang.org>
-
-	* iseq.c (rb_iseq_clone): sets local_iseq and klass properly.
-
-Wed Mar 10 21:25:41 2010  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* enum.c (min_ii, max_ii, minmax_ii): remove wrong optimization that
-	  reuses array for yield parameter, which caused unexpected behavior.
-	  [ruby-core:25989]
-
-Wed Mar 10 12:10:00 2010  Kenta Murata  <mrkn@mrkn.jp>
-
-	* enc/x_emoji.h: renamed from enc/x-emoji.c.
-
-Wed Mar 10 04:17:08 2010  Koichi Sasada  <ko1@atdot.net>
-
-	* compile.c (defined_expr), insns.def (defined): fix to pass a Symbol
-	  object such as :$foo for the "defined?($foo)" expression
-	  on defined instruction.  This patch fixes ISeq#to_a/load.
-
-Tue Mar  9 20:50:09 2010  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* test/dl/test_method.rb: delete a residual test for dl on libffi.
-
-Tue Mar  9 18:00:00 2010  Kenta Murata  <mrkn@mrkn.jp>
-
-	* enc/trans/EMOJI/*.src, enc/trans/emoji*,
-	  enc/x-emoji.c, test/ruby/enc/test_emoji.rb,
-	  tool/enc-emoji-citrus-gen.rb, tool/enc-emoji4unicode.rb,
-	  tool/jisx0208.rb, tool/test/test_jisx0208.rb:
-	  new encodings to support emoji charsets, which are used by
-	  Japanese mobile phones [ruby-dev:40528].
-	  Thanks Yoji Shidara for a lot of contribution.
-
-	* tool/transcode-tblgen.rb: modified for enc-emoji4unicode.rb.
-
-Tue Mar  9 14:57:40 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* tool/transcode-tblgen.rb (ActionMap#generate_node):
-	  remove useless dup.
-
-	* tool/transcode-tblgen.rb (transcode_tbl_only): remove duplicated
-	  method call for encode_utf8.
-
-Tue Mar  9 14:55:00 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* re.c (rb_reg_to_s): remove unused variable.
-
-Tue Mar  9 12:17:34 2010  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* tool/transcode-tblgen.rb (StrSet#parse, ActionMap#generate_node):
-	  optimization (reusing object and improving memoize).
-	  [ruby-dev:40582]
-
-Sun Mar  7 02:27:03 2010  Alexander Zavorine  <alexandre.zavorine@nokia.com>
-
-	* dln.c [DLN_NEEDS_ALT_SEPARATOR] (translit_separator): small typo
-	  fixed.
-
-	* symbian/setup (*.pkg): Shared library installation path fixed to
-	  match changes in version.c.
-
-	* symbian/setup (ruby.mmp): SOURCE dln_find.c added.
-
-Sun Mar  7 23:14:22 2010  Tanaka Akira  <akr@fsij.org>
-
-	* bignum.c (rb_big_pack): use DIGSPERLONG and BITSPERDIG.
-	  (rb_big_unpack): use DIGSPERLONG.
-
-Sun Mar  7 19:21:10 2010  Marc-Andre Lafortune  <ruby-core@marc-andre.ca>
-
-	* io.c: Fix documentation for each/each_line/lines, bytes/each_byte,
-	  codepoints/each_code_point [ruby-core:23948]
-
-	* string.c: ditto
-
-	* ext/stringio/stringio.c: ditto
-
-Sun Mar  7 13:49:49 2010  Tanaka Akira  <akr@fsij.org>
-
-	* file.c: add optional basedir argument for realpath/realdirpath.
-	  (realpath_internal): handle basedir.
-	  (rb_file_s_realpath): extract basedir from argument list.
-	  (rb_file_s_realdirpath): extract basedir from argument list.
-
-	* lib/pathname.rb (realpath): pass basedir.
-	  (realdirpath): ditto.
-
-Sun Mar  7 02:05:38 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* encoding.c (enc_set_filesystem_encoding):
-	  filesystem encoding on Mac OS X is now
-	  default external encoding. so Mac OS X is now
-	  treated as one of Unix. [ruby-dev:40439]
-
-	* file.c (file_path_convert): ditto.
-
-Sat Mar  6 22:07:09 2010  Tanaka Akira  <akr@fsij.org>
-
-	* pack.c: fix the prototype of rb_big2ulong_pack.
-
-Sat Mar  6 13:45:37 2010  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* io.c (rb_io_s_write, rb_io_s_binwrite): delete File#write and
-	  #binwrite.  It may take a long time to make them stable, so 1.9.2
-	  should not include them.  We need refactoring to implement them
-	  again.
-
-	* test/ruby/test_io.rb: delete tests for them.
-
-Sat Mar  6 10:03:35 2010  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* io.c (rb_io_s_binwrite): use mode "r+b" instead of "ab" to handle
-	  offset correctly.  [ruby-core:28517]
-
-	* test/ruby/test_io.rb: use assert_equal instead of assert.
-
-Sat Mar  6 01:08:54 2010  NAKAMURA Usaku  <usa@ruby-lang.org>
-
-	* win32/Makefile.sub (config.h): VC6 has __int64.
-
-Fri Mar  5 19:36:12 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* transcode.c (econv_opts): set :undef => :replace when
-	  :replace is given and :invalid is not given. [ruby-dev:40554]
-
-Fri Mar  5 17:51:09 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* io.c (pipe_open): suppressed a warning.
-
-	* win32/win32.c (rb_w32_map_errno, winnt_stat, rb_chsize): ditto.
-
-	* win32/win32.c (rb_w32_aspawn): get rid of overflow.
-
-Fri Mar  5 11:59:30 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* win32/win32.c (signbit): defined on mingw.
-
-Thu Mar  4 22:49:42 2010  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* eval.c (setup_exception): avoid line number 0 when setting
-	  $DEBUG=true.  [ruby-dev:39116]
-
-Thu Mar  4 22:45:02 2010  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* io.c (io_s_write, io_s_binwrite): add File#write and #binwrite.
-	  [ruby-core:21701]
-
-	* test/ruby/test_io.rb: add tests for above.
-
-Mon Mar  4 13:14:34 2010  wanabe  <s.wanabe@gmail.com>
-
-	* gc.c (gc_profile_total_time): add GC::Profiler.total_time.
-	  [ruby-core:27169]
-
-	* NEWS: ditto.
-
-Thu Mar  4 10:15:10 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* complex.c (m_log, m_exp): remove unused functions.
-
-Thu Mar  4 02:34:59 2010  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* test/ruby/test_env.rb (TestEnv#test_select_bang): add tests.
-
-Thu Mar  4 02:29:52 2010  Kazuhiro NISHIYAMA  <zn@mbf.nifty.com>
-
-	* test/ruby/test_hash.rb (TestHash#test_keep_if): fix typo.
-
-Thu Mar  4 00:10:54 2010  Tanaka Akira  <akr@fsij.org>
-
-	* tool/transcode-tblgen.rb (HEX2): extracted from regexps.
-
-Wed Mar  3 23:16:32 2010  Marc-Andre Lafortune  <ruby-core@marc-andre.ca>
-
-	* complex.c (nucomp_real_check): raise TypeError instead of
-	  ArgumentError when argument is not a real as expected
-	  [ruby-core:28395]
-
-	* rational.c (nurat_int_check): ditto (for integers)
-
-Wed Mar  3 23:07:08 2010  Marc-Andre Lafortune  <ruby-core@marc-andre.ca>
-
-	* lib/matrix.rb (Vector#each): Return self and optimization
-	  [ruby-core:28405]
-
-Wed Mar  3 18:35:55 2010  Yukihiro Matsumoto  <matz@ruby-lang.org>
-
-	* hash.c (rb_hash_select_bang): add #select! and keep_if to Hash.
-
-	* hash.c (env_select_bang): ..and to ENV.
-
-Wed Mar  3 15:54:20 2010  Yukihiro Matsumoto  <matz@ruby-lang.org>
-
-	* lib/matrix.rb (Vector#each2, collect2): small refactoring.
-
-Wed Mar  3 16:14:24 2010  Yukihiro Matsumoto  <matz@ruby-lang.org>
-
-	* lib/matrix.rb (Vector#each): make Vector enumerable.
-	  [ruby-core:28405]
-
-Wed Mar  3 14:28:23 2010  Yukihiro Matsumoto  <matz@ruby-lang.org>
-
-	* array.c (rb_ary_select_bang): select! removes all elements for
-	  which block returns false.  [ruby-core:27286]
-
-	* array.c (rb_ary_keep_if): #keep_if, new method.
-
-Wed Mar  3 06:19:25 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* win32/win32.c (signbit): defined.
-
-	* win32/Makefile.sub, symbian/setup (config.h): pack.c requires
-	  SIZEOF_INT*_T now.
-
-Tue Mar  2 21:16:48 2010  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* io.c (rb_io_lines, rb_io_bytes, rb_io_chars, rb_io_codepoints):
-	  change to alias to each_*, in similar way to ARGF and String.
-	  [ruby-core:23948]
-
-Tue Mar  2 15:54:40 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* regcomp.c (noname_disable_map): add NT_ANCHOR case.
-	  Without this change, captured groups in anchors (look-ahead,
-	  look-behind, and so on) are not removed and
-	  unintended invalid backref error occur. [ruby-core:28235]
-
-	* regcomp.c (renumber_by_map): ditto.
-
-Tue Mar  2 14:42:00 2010  Kenta Murata  <mrkn@mrkn.jp>
-
-	* test/dl/test_closure.rb: forget to revert at r26764.
-
-Tue Mar  2 14:29:24 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* file.c (rb_find_file_ext_safe, rb_find_file_safe): skip argument
-	  checks in file_expand_path().
-
-Tue Mar  2 13:54:44 2010  Marc-Andre Lafortune  <ruby-core@marc-andre.ca>
-
-	* test/ruby/test_math.rb: Fix lgamma test
-
-Mon Mar  1 23:26:56 2010  Tanaka Akira  <akr@fsij.org>
-
-	* ext/pty/pty.c (pty_open): refine the path for master IO.
-
-Mon Mar  1 20:07:06 2010  TAKANO Mitsuhiro (takano32)  <tak@no32.tk>
-
-	* ext/zlib/zlib.c (zstream_expand_buffer_into): remove compare
-	  different type values warning.
-
-Mon Mar  1 17:42:45 2010  wanabe  <s.wanabe@gmail.com>
-
-	* configure.in (mingw): do not detect snprintf/vsnprintf.
-
-Mon Mar  1 16:54:21 2010  Yukihiro Matsumoto  <matz@ruby-lang.org>
-
-	* include/ruby/oniguruma.h: updated to follow Oniguruma 5.9.2.
-
-	* re.c (make_regexp): use onig_new() instead of onig_alloc_init().
-
-	* re.c (rb_reg_to_s): ditto.
-Sun Feb 28 21:32:36 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* ext/pty/pty.c (get_device_once): raise on error when fail is
-	  non-zero.
-
-Sun Feb 28 18:58:00 2010  Kenta Murata  <mrkn@mrkn.jp>
-
-	* math.c (rb_eMathDomainError): new exception class
-	  for representing mathematical domain error instead
-	  of Errno::EDOM.
-
-	* math.c (domain_check, infinity_check): removed,
-	  no longer needed.
-
-	* math.c (math_atan2, math_acos, math_asin, math_acosh,
-	  math_atanh, math_log, math_log2, math_log10, math_sqrt,
-	  math_gamma, math_lgamma): mathematical domain errors
-	  are checked and raised before calling libm's functions.
-
-	* test/ruby/test_math.rb: updated for changes of math.c.
-
-Sun Feb 28 15:07:28 2010  Tanaka Akira  <akr@fsij.org>
-
-	* pack.c (pack_pack): use union to avoid pointer cast.
-	  (pack_unpack): ditto.
-
-Sun Feb 28 11:49:35 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* openssl/ossl.c (OSSL_IMPL_SK2ARY): for OpenSSL 1.0.
-	  patched by Jeroen van Meeuwen at [ruby-core:25210]
-	  fixed by Nobuyoshi Nakada [ruby-core:25238],
-	  Hongli Lai [ruby-core:27417],
-	  and Motohiro KOSAKI [ruby-core:28063]
-
-	* ext/openssl/ossl_pkcs7.c (pkcs7_get_certs, pkcs7_get_crls):
-	  split pkcs7_get_certs_or_crls.
-
-Sun Feb 28 11:42:55 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* test/openssl/{test_x509cert.rb,openssl,test_x509crl.rb,
-	  test_x509req.rb}:
-	  fix false positive tests because of OpenSSL spec change.
-	  patched by originally Hongli Lai [ruby-core:27417],
-	  and fixed by Motohiro KOSAKI [ruby-core:28063]
-
-Sun Feb 28 11:21:03 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* test/openssl/{test_x509cert.rb,openssl,test_x509req.rb}:
-	  remove false positive tests because of OpenSSL spec change.
-	  patched by Motohiro KOSAKI [ruby-core:28063]
-	  see also [ruby-dev:40077]
-
-Sun Feb 28 11:25:16 2010  Tanaka Akira  <akr@fsij.org>
-
-	* pack.c (pack_pack): generalized integer packer implemented.
-	  (pack_unpack): generalized integer unpacker implemented.
-
-Sun Feb 28 06:58:53 2010  Tanaka Akira  <akr@fsij.org>
-
-	* pack.c (swap32): use __builtin_bswap32 on gcc 4.3.0 or later.
-	  (swap64): ditto.
-
-Sun Feb 28 00:38:18 2010  Tanaka Akira  <akr@fsij.org>
-
-	* pack.c: use integer types with explicit size.
-
-Sat Feb 27 15:54:55 2010  Tanaka Akira  <akr@fsij.org>
-
-	* pack.c: check assumption on QUAD_SIZE and SIZEOF_LONG.
-
-	* bignum.c: check assumption on SIZEOF_LONG and SIZEOF_BDIGITS.
-
-Sat Feb 27 03:48:18 2010  Tanaka Akira  <akr@fsij.org>
-
-	* pack.c: fix q and Q for big endian environments which have no
-	  8 bytes integer type.
-	  (pack_pack): use rb_big_pack.
-	  (pack_unpack): use rb_big_unpack.
-
-	* include/ruby/intern.h (rb_big_pack): declared.
-	  (rb_big_unpack): ditto.
-
-	* bignum.c (rb_big_pack): new function.
-	  (rb_big_unpack): ditto.
-
-Fri Feb 26 21:36:51 2010  Tanaka Akira  <akr@fsij.org>
-
-	* bignum.c: fix rb_quad_pack and rb_quad_unpack for environments
-	  which don't have 8bytes integer type.  This still depends on little
-	  endian.
-	  (rb_quad_pack): use quad_buf_complement.  don't raise for large
-	  values.
-	  (rb_quad_unpack): use quad_buf_complement.
-	  (quad_buf_complement): new function extracted from rb_quad_pack.
-	  add one after bitwise negation.
-
-Fri Feb 26 21:29:48 2010  Tanaka Akira  <akr@fsij.org>
-
-	* configure.in (RSHIFT): add parenthesis to suppress warning.
-
-Fri Feb 26 20:51:47 2010  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* ext/socket/raddrinfo.c, ext/socket/udpsocket.c: avoid illegal cast
-	  from void-returning function to VALUE-returning one.  It causes SEGV
-	  on RubySpec with mingw32.
-
-Fri Feb 26 20:07:48 2010  Tanaka Akira  <akr@fsij.org>
-
-	* pack.c (QUAD_SIZE): it should be always 8.
-
-	* bignum.c (rb_quad_pack): use LONG_LONG version only if
-	  SIZEOF_LONG_LONG == QUAD_SIZE.
-
-Fri Feb 26 16:49:29 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* pack.c (swap64): fix for VC6.
-
-Fri Feb 26 14:17:09 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* pack.c (pack_pack, pack_unpack): suppressed warnings.
-
-Fri Feb 26 07:44:51 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* ext/dl: revert dl with libffi because it can't run on mswin now.
-
-Thu Feb 25 22:59:46 2010  Tanaka Akira  <akr@fsij.org>
-
-	* pack.c: consider DYNAMIC_ENDIAN.  refactored.
-
-Thu Feb 25 11:17:01 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* rational.c (nurat_expt): use Float#** when Rational ** Float.
-	  This fixes Rational(3,1)**3.0=>26.99999999999999 on FreeBSD.
-
-	* complex.c (rb_fexpt): removed.
-	  Note that this function is not static but is private.
-
-Thu Feb 25 00:43:57 2010  Koichi Sasada  <ko1@atdot.net>
-
-	* insns.def: Change the operand type of setinlinecache
-	  (OFFSET to IC).  This IC must be same as corresponding
-	  getinlinecache instruction's IC operand.
-	  This change is for a little performance improvement
-	  (getting IC directly) and is for the AOT compilation development.
-
-	* compile.c, iseq.c, insns.def: Change the approach to handling inline
-	  cache (IC) type operand to enable the above change.
-	  This change also affects ISeq#to_a method.  The inline cache operand
-	  will be dumped by fixnum, the index of inline cache, in other words,
-	  inline cache identity.
-
-	* template/insns_info.inc.tmpl, tool/instruction.rb: No need to count
-	  inline cache size (insn_iclen()).
-
-Thu Feb 25 00:57:59 2010  Tanaka Akira  <akr@fsij.org>
-
-	* pack.c (swap64): don't redefine.
-
-Thu Feb 25 00:29:55 2010  Tanaka Akira  <akr@fsij.org>
-
-	* pack.c (pack_unpack): don't use OFF32 for gcc 4.5.
-
-Wed Feb 24 22:39:15 2010  Tanaka Akira  <akr@fsij.org>
-
-	* lib/resolv.rb: fix [ruby-core:28320] reported by Paul Clegg.
-	  (Resolv::DNS::Requester#request): raise ResolvTimeout
-	  consistently for timeout.
-
-Wed Feb 24 14:38:16 2010  Eric Hodel  <drbrain@segment7.net>
-
-	* lib/rubygems/indexer: Removed obsolete files.
-
-Wed Feb 24 11:52:05 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* dln.c (translit_separator): moved back from load.c again.
-
-	* dln_find.c: split from dln.c.
-
-Wed Feb 24 09:31:33 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* ext/digest/extconf.rb: use OpenSSL only when all transform
-	  functions are available.
-
-Wed Feb 24 00:39:17 2010  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* string.c (str_new_empty): String#split, partition, rpartition
-	  taints the resulting strings if self is tainted.
-
-Mon Feb 22 21:35:33 2010  Tanaka Akira  <akr@fsij.org>
-
-	* ext/digest/sha2/sha2init.c: test OpenSSL more strictly.
-
-Mon Feb 22 11:52:30 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* lib/rubygems: update to 1.3.6.
-
-Mon Feb 22 11:21:18 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* ext/digest/sha2: Use OpenSSL's SHA1 engine if available.
-
-Sun Feb 21 21:20:17 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* lib/mkmf.rb (create_makefile, install_files): honor srcprefix
-	  argument if given.  [ruby-dev:40449]
-
-Sun Feb 21 13:29:57 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* lib/rubygems/rubygems_version.rb: outdated.  [ruby-core:28275]
-
-Sun Feb 21 06:24:12 2010  Alexander Zavorine  <alexandre.zavorine@nokia.com>
-
-	* symbian/setup (config.h): HAVE_STRUCT_TIMEZONE, VOID_UNSETENV, and RUBY_LIB_VERSION_STYLE defined.
-	* symbian/setup (ruby.mmp): SOURCE node.c added.
-
-Mon Feb 22 09:15:45 2010  Yukihiro Matsumoto  <matz@ruby-lang.org>
-
-	* gc.c (gc_mark_children): lost comment added.
-
-Sat Feb 20 14:42:19 2010  Yukihiro Matsumoto  <matz@ruby-lang.org>
-
-	* marshal.c (r_object0): should prepare placeholder before
-	  processing instance variables.  [ruby-dev:40414]
-
-	* marshal.c (id2encidx): no longer need arg.
-
-Sat Feb 20 14:36:16 2010  Yukihiro Matsumoto  <matz@ruby-lang.org>
-
-	* vm.c (vm_backtrace_each): use called_id when method definition
-	  structure is already freed.  [ruby-dev:40234] [ruby-core:27959]
-
-Fri Feb 19 00:04:19 2010  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* lib/drb/drb.rb (DRbServer#stop_service): join killed thread to
-	  ensure service stops.  [ruby-dev:40441]
-
-Thu Feb 18 22:31:15 2010  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* math.c (math_atanh): raise ERANGE without calling atanh if absolute
-	  value is 1 to achieve platform-independent math.  [ruby-core:28219]
-
-	* math.c (math_lgamma): return [Infinity, 1] without calling lgamma_r
-	  if argument is infinity or -infinity.  [ruby-core:28219]
-
-Thu Feb 18 22:28:00 2010  Kenta Murata  <mrkn@mrkn.jp>
-
-	* configure.in: new --with-ext and --with-out-ext options for extmk.
-	* tool/mkconfig.rb: normalizing --with-out-ext to --without-ext.
-
-Thu Feb 18 21:50:00 2010  Tanaka Akira  <akr@fsij.org>
-
-	* pack.c (pack_unpack): call PACK_ITEM_ADJUST for 'Q'.
-
-Thu Feb 18 02:14:26 2010  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* io.c (io_fread, io_getpartial, io_read, io_sysread): by using lock,
-	  prohibit modification of buffer string during read (which had caused
-	  EFAULT or SEGV).  [ruby-dev:40437]
-
-	* test/ruby/test_io.rb: rewrite tests for the old behavior.
-
-Wed Feb 17 21:34:01 2010  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* regcomp.c (setup_tree, onig_compile): optimize .* at last by
-	  converting into (?>.*), which does not backtrack.  [ruby-core:27791]
-
-	* test/ruby/test_regexp.rb: add a test for above.
-
-Wed Feb 17 21:26:53 2010  Tanaka Akira  <akr@fsij.org>
-
-	* bootstraptest/runner.rb (assert_normal_exit): add :timeout option.
-
-Wed Feb 17 17:05:39 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* vm_insnhelper.c (vm_call_cfunc): removed unused variable.
-
-	* vm.c (vm_frametype_name): define only when VMDEBUG.
-
-Wed Feb 17 15:34:45 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* ext/dl/dl_conversions.c (rb_dl_type_to_ffi_type): support signed
-	  long long.
-
-	* ext/dl/cfunc.c (rb_dlcfunc_inspect): get rid of overflow.
-
-	* ext/dl/closure.c (dlc_callback, rb_dlclosure_init): ditto.
-
-	* ext/dl/cptr.c (rb_dlptr_s_malloc): ditto.
-
-	* ext/dl/method.c (rb_dlfunction_initialize): ditto.
-
-Wed Feb 17 01:16:12 2010  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* hash.c (hash_update): always raise an exception when adding a new
-	  key during iteration.  Traditionally, an exception was raised only
-	  when rehash occurs, but it may lead to difficult bug to reproduce.
-	  [ruby-core:23614]
-
-Tue Feb 16 22:09:27 2010  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* gc.c (chain_finalized_object): fix precedence.
-
-Tue Feb 16 21:32:01 2010  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* gc.c (rb_objspace_call_finalizer): always run finalizer at exit,
-	  before object is free'd.  [ruby-dev:40382]
-
-Tue Feb 16 20:56:39 2010  Tanaka Akira  <akr@fsij.org>
-
-	* file.c (rb_group_member): renamed from group_member.
-	  don't use group_member() in glibc because it's not valgrind clean.
-	  http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=570047
-
-Tue Feb 16 19:19:21 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* ext/dl/cfunc.c (rb_dlcfunc_call): convert signed value to
-	  unsigned.
-
-Tue Feb 16 19:02:59 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* test/dl/test_{base,handle}.rb: use more verbose assertions.
-
-	* test/dl/test_import.rb (DL::LIBC::BoundQsortCallback): renamed
-	  to get rid of overwriting warning.
-
-Tue Feb 16 11:03:19 2010  Aaron Patterson  <aaron@tenderlovemaking.com>
-
-	* ext/dl/method.c: Adding DL::Method as a superclass for DL::Function
-
-Mon Feb 15 23:37:30 2010  Tanaka Akira  <akr@fsij.org>
-
-	* io.c: check lseek error by errno.  NetBSD 4.0.1 may return -1 as
-	  a file position of tty.
-
-Mon Feb 15 23:08:56 2010  Tanaka Akira  <akr@fsij.org>
-
-	* lib/pstore.rb (PStore#initialize): initialize @thread_safe.
-	  [ruby-core:27853]
-
-Mon Feb 15 22:45:26 2010  Tanaka Akira  <akr@fsij.org>
-
-	* st.c (st_foreach): don't access ptr->hash after func call.
-	  It may access freed area.
-
-Mon Feb 15 22:25:16 2010  Tanaka Akira  <akr@fsij.org>
-
-	* ext/zlib/zlib.c (zlib_mem_alloc): suppress valgrind warnings.
-	  http://www.zlib.net/zlib_faq.html#faq36
-
-Mon Feb 15 22:18:49 2010  Tanaka Akira  <akr@fsij.org>
-
-	* time.c (time_add): propagate fixed time offset.
-
-Mon Feb 15 17:42:20 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* signal.c (USE_SIGALTSTACK): NetBSD can't use sigaltstack(2)
-	  with pthread.
-	  http://netbsd.gw.com/cgi-bin/man-cgi?sigaltstack++NetBSD-current
-
-Mon Feb 15 13:11:47 2010  NARUSE, Yui  <naruse@ruby-lang.org>
-
-	* array.c (rb_ary_push_m): use rb_ary_modify instead of
-	  rb_ary_modify_check. This fixes regression due to r26632.
-
-Sun Feb 14 12:54:44 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* marshal.c (r_object0): removed duplicated entry for regexp.
-	  [ruby-dev:40416]
-
-Sun Feb 14 04:45:31 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* marshal.c (r_object0): register regexp object before encoding
-	  name.  [ruby-dev:40414]
-
-	* re.c (rb_reg_alloc, rb_reg_init_str): split from rb_reg_new_str.
-
-Sat Feb 13 17:07:20 2010  Yukihiro Matsumoto  <matz@ruby-lang.org>
-
-	* array.c (rb_ary_delete): RDoc update.  a patch from Hugh Sasse.
-	  [ruby-core:28128]
-
-	* array.c (rb_ary_compact_bang): ditto.
-
-Sat Feb 13 15:01:24 2010  Yukihiro Matsumoto  <matz@ruby-lang.org>
-
-	* marshal.c (id2encidx): duplicated entry for encoding name.
-	  [ruby-dev:40388]
-
-Sat Feb 13 12:17:52 2010  Tanaka Akira  <akr@fsij.org>
-
-	* lib/tempfile.rb (Tempfile::Remover): new class to replace
-	  Tempfile.callback.  port r24902 from Ruby 1.8.
-
-Fri Feb 12 17:55:21 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* vm.c (thread_free): fixed typo.
-
-Fri Feb 12 02:27:39 2010  Akinori MUSHA  <knu@iDaemons.org>
-
-	* lib/set.rb (Set#initialize, Set#replace, Set#merge)
-	  (Set#subtract, Set#&): Fix duck type tests. [ruby-core:28078]
-
-	* lib/set.rb (Set#initialize, Set#replace, Set#merge)
-	  (Set#subtract, Set#&): Try #each if #each_entry fails.
-
-Thu Feb 11 20:43:00 2010  Tanaka Akira  <akr@fsij.org>
-
-	* io.c (rb_io_oflags_modestr): return "r" for O_RDONLY|O_APPEND.
-	  [ruby-dev:40379]
-
-Thu Feb 11 19:19:21 2010  Kazuhiro NISHIYAMA  <zn@mbf.nifty.com>
-
-	* missing/alloca.c: s/RUBY_LIB/RUBY_LIB_PREFIX/ [ruby-dev:40395]
-
-Thu Feb 11 17:52:11 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* vm.c (vm_exec): reset thread state before restarting vm loop
-	  from catch scope.  [ruby-core:28129], [ruby-core:28143]
-
-Thu Feb 11 14:43:16 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* marshal.c (r_object0): read sequentially since marshal source
-	  may not be possible to rewind.  [ruby-dev:40386]
-
-	* marshal.c (r_object0): replace non-1.8 escapes directly.
-
-Thu Feb 11 09:49:31 2010  Tanaka Akira  <akr@fsij.org>
-
-	* lib/resolv.rb: fix [ruby-core:28144] reported by Hans de Graaff.
-	  (Resolv::DNS#make_requester): pass nameserver_port to
-	  UnconnectedUDP.new.
-	  (Resolv::DNS.bind_random_port): change the is_ipv6 argument to
-	  bind_host.
-	  (Resolv::DNS::Requester#initialize): change instance variable to
-	  store multiple sockets.
-	  (Resolv::DNS::Requester#request): pass readable sockets to
-	  recv_reply.
-	  (Resolv::DNS::Requester#close): close all sockets.
-	  (Resolv::DNS::Requester::UnconnectedUDP#initialize): allocate
-	  a socket for each address family of name servers.
-	  (Resolv::DNS::Requester::UnconnectedUDP#recv_reply): read from the
-	  passwd readable socket.
-	  (Resolv::DNS::Requester::UnconnectedUDP#sender): use appropriate
-	  socket for the target nameserver.
-	  (Resolv::DNS::Requester::ConnectedUDP): follow the instance variable
-	  change.
-	  (Resolv::DNS::Requester::TCP#sender): ditto.
-	  (Resolv::DNS::Config#nameserver_port): new method.
-
-Thu Feb 11 01:45:04 2010  Yusuke Endoh  <mame@tsg.ne.jp>
-
-	* vm.c (vm_exec): temporarily revert r26628, which causes SEGV when
-	  executing rubyspec.
-
-Wed Feb 10 16:31:03 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* array.c (rb_ary_push_m, rb_ary_unshift_m, rb_ary_aset),
-	  (rb_ary_insert, rb_ary_replace, rb_ary_concat),
-	  (rb_ary_uniq_bang, rb_ary_flatten_bang): check if frozen after
-	  wrong number of arguments but before TypeError.
-	  [ruby-core:28140]
-
-	* hash.c (rb_hash_replace): ditto.
-
-	* string.c (rb_str_replace): ditto.
-</