[DOC] Move from NEWS to doc/NEWS-2.6.0 [ci skip]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@66557 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 2 insertions, 637 deletions

diff --git a/NEWS b/NEWS
index 07e8518841..daa1f0812c 100644
--- a/NEWS
+++ b/NEWS
@@ -1,6 +1,6 @@
 # -*- rdoc -*-
 
-= NEWS for Ruby 2.6.0
+= NEWS for Ruby 2.7.0
 
 This document is a list of user visible feature changes made between
 releases except for bug fixes.
@@ -10,655 +10,20 @@ information is supplied with.  For a full list of changes with all
 sufficient information, see the ChangeLog file or Redmine
 (e.g. <tt>https://bugs.ruby-lang.org/issues/$FEATURE_OR_BUG_NUMBER</tt>)
 
-== Changes since the 2.5.0 release
+== Changes since the 2.6.0 release
 
 === Language changes
 
-* <code>$SAFE</code> now is a process global state and can be set to 0 again. [Feature #14250]
-
-* Refinements take place at block passing.  [Feature #14223]
-
-* Refinements take place at Kernel#public_send.  [Feature #15326]
-
-* Refinements take place at Kernel#respond_to?.  [Feature #15327]
-
-* +else+ without +rescue+ now causes a syntax error.  [EXPERIMENTAL] [Feature #14606]
-
-* Constant names may start with a non-ASCII capital letter. [Feature #13770]
-
-* Endless ranges are introduced.  You can use a Range that has no end,
-  like <code>(0..)</code> (or similarly <code>(0...)</code>).  [Feature #12912]
-
-  The following shows typical use cases:
-
-    ary[1..]                              # identical to ary[1..-1]
-    (1...).each {|index| block }          # infinite loop from index 1
-    ary.zip(1..) {|elem, index| block }   # ary.each.with_index(1) { }
-
-* Non-Symbol keys in a keyword arguments hash cause an exception.
-
-* The "shadowing outer local variable" warning is removed.  [Feature #12490]
-
-  You can now write the following without warning:
-
-    user = users.find {|user| cond(user) }
-
-* Print +cause+ of the exception if the exception is not caught and printed
-  its backtraces and error message. [Feature #8257]
-
-* The flip-flop syntax is deprecated. [Feature #5400]
-
 === Core classes updates (outstanding ones only)
 
-[Array]
-
-  [New methods]
-
-    * Added Array#union and Array#difference instance methods.  [Feature #14097]
-
-  [Modified methods]
-
-    * Array#to_h now accepts a block that maps elements to new key/value pairs.  [Feature #15143]
-
-  [Aliased methods]
-
-    * Array#filter is a new alias for Array#select. [Feature #13784]
-    * Array#filter! is a new alias for Array#select!. [Feature #13784]
-
-[Binding]
-
-  [New methods]
-
-    * Added Binding#source_location.  [Feature #14230]
-
-      This method returns the source location of the binding, a 2-element
-      array of <code>__FILE__</code> and <code>__LINE__</code>.
-      Traditionally, the same information could be retrieved by
-      <code>eval("[__FILE__, __LINE__]", binding)</code>, but we are
-      planning to change this behavior so that Kernel#eval ignores
-      binding's source location [Bug #4352].  So, users should use this
-      newly-introduced method instead of Kernel#eval.
-
-[Dir]
-
-  [New methods]
-
-    * Added Dir#each_child and Dir#children instance methods. [Feature #13969]
-
-[Enumerable]
-
-  [New methods]
-
-    * Enumerable#chain returns an enumerator object that iterates over the
-      elements of the receiver and then those of each argument
-      in sequence.  [Feature #15144]
-
-  [Modified methods]
-
-    * Enumerable#to_h now accepts a block that maps elements to new key/value pairs.  [Feature #15143]
-
-  [Aliased methods]
-
-    * Enumerable#filter is a new alias for Enumerable#select. [Feature #13784]
-
-[Enumerator::ArithmeticSequence]
-
-  * This is a new class to represent a generator of an arithmetic sequence,
-    that is a number sequence defined by a common difference. It can be used
-    for representing what is similar to Python's slice. You can get an
-    instance of this class from Numeric#step and Range#step.
-
-[Enumerator::Chain]
-
-  * This is a new class to represent a chain of enumerables that works as a
-    single enumerator, generated by such methods as Enumerable#chain and
-    Enumerator#+.
-
-[Enumerator::Lazy]
-
-  [Aliased methods]
-
-    * Enumerator::Lazy#filter is a new alias for
-      Enumerator::Lazy#select.  [Feature #13784]
-
-[Enumerator]
-
-  [New methods]
-
-    * Enumerator#+ returns an enumerator object that iterates over the
-      elements of the receiver and then those of the other operand.  [Feature #15144]
-
-[ENV]
-
-  [Modified methods]
-
-    * ENV.to_h now accepts a block that maps names and values to new keys and values.  [Feature #15143]
-
-[Exception]
-
-  [New options]
-
-    * Exception#full_message takes +:highlight+ and +:order+
-      options. [Bug #14324]
-
-[Hash]
-
-  [Modified methods]
-
-    * Hash#merge, Hash#merge!, and Hash#update now accept multiple
-      arguments.  [Feature #15111]
-
-    * Hash#to_h now accepts a block that maps keys and values to new keys and values.  [Feature #15143]
-
-  [Aliased methods]
-
-    * Hash#filter is a new alias for Hash#select.  [Feature #13784]
-
-    * Hash#filter! is a new alias for Hash#select!. [Feature #13784]
-
-[IO]
-
-  [New options]
-
-    * Added new mode character <code>'x'</code> to open files for exclusive
-      access. [Feature #11258]
-
-[Kernel]
-
-  [Aliased methods]
-
-    * Kernel#then is a new alias for Kernel#yield_self. [Feature #14594]
-
-  [New options]
-
-    * Kernel#Complex, Kernel#Float, Kernel#Integer, and
-      Kernel#Rational take an +:exception+ option to specify the way of
-      error handling.  [Feature #12732]
-
-    * Kernel#system takes an +:exception+ option to raise an exception
-      on failure.  [Feature #14386]
-
-  [Incompatible changes]
-
-    * Kernel#system and Kernel#exec do not close non-standard file descriptors
-      (the default of the +:close_others+ option is changed to +false+,
-      but we still set the +FD_CLOEXEC+ flag on descriptors we
-      create).  [Misc #14907]
-
-[KeyError]
-
-  [New options]
-
-    * KeyError.new accepts +:receiver+ and +:key+ options to set receiver and
-      key in Ruby code.  [Feature #14313]
-
-[Method]
-
-  [New methods]
-
-    * Added Method#<< and Method#>> for Proc composition.  [Feature #6284]
-
-[Module]
-
-  [Modified methods]
-
-    * Module#method_defined?, Module#private_method_defined?, and
-      Module#protected_method_defined? now accept the second
-      parameter as optional. If it is +true+ (the default value), it checks
-      ancestor modules/classes, or checks only the class itself. [Feature #14944]
-
-[NameError]
-
-  [New options]
-
-    * NameError.new accepts a +:receiver+ option to set receiver in Ruby
-      code.  [Feature #14313]
-
-[NilClass]
-
-  [New methods]
-
-    * NilClass#=~ is added for compatibility.  [Feature #15231]
-
-[NoMethodError]
-
-  [New options]
-
-    * NoMethodError.new accepts a +:receiver+ option to set receiver in Ruby
-      code.  [Feature #14313]
-
-[Numeric]
-
-  [Incompatible changes]
-
-    * Numeric#step now returns an instance of the Enumerator::ArithmeticSequence
-      class rather than one of the Enumerator class.
-
-[OpenStruct]
-
-  [Modified methods]
-
-    * OpenStruct#to_h now accepts a block that maps keys and values to new keys and values.  [Feature #15143]
-
-[Proc]
-
-  [New methods]
-
-    * Added Proc#<< and Proc#>> for Proc composition.  [Feature #6284]
-
-  [Incompatible changes]
-
-    * Proc#call doesn't change <code>$SAFE</code> any more.  [Feature #14250]
-
-[Random]
-
-  [New methods]
-
-    * Added Random.bytes.  [Feature #4938]
-
-[Range]
-
-  [New methods]
-
-    * Added Range#% instance method.  [Feature #14697]
-
-  [Incompatible changes]
-
-    * Range#=== now uses the +#cover?+ instead of the +#include?+ method. [Feature #14575]
-    * Range#cover? now accepts a Range object. [Feature #14473]
-    * Range#step now returns an instance of the Enumerator::ArithmeticSequence
-      class rather than one of the Enumerator class.
-
-[Regexp/String]
-
-    * Update Unicode version from 10.0.0 to 11.0.0. [Feature #14802]
-
-      This includes a rewrite of the grapheme cluster (/\X/) algorithm
-      and special-casing for Georgian MTAVRULI on String#downcase.
-
-    * Update Emoji version from 5.0 to 11.0.0 [Feature #14802]
-
-[RubyVM::AbstractSyntaxTree]
-
-  [New methods]
-
-    * RubyVM::AbstractSyntaxTree.parse parses a given string and returns AST
-      nodes. [experimental]
-
-    * RubyVM::AbstractSyntaxTree.parse_file parses a given file and returns AST
-      nodes.  [experimental]
-
-    * RubyVM::AbstractSyntaxTree.of returns AST nodes of the given proc or method.
-      [experimental]
-
-[RubyVM]
-
-  [New methods]
-
-    * RubyVM.resolve_feature_path identifies the file that will be loaded by
-      "require(feature)". [experimental] [Feature #15230]
-
-[String]
-
-  * String#crypt is now deprecated. [Feature #14915]
-
-  [New features]
-
-    * String#split yields each substring to the block if given. [Feature #4780]
-
-[Struct]
-
-  [Modified methods]
-
-    * Struct#to_h now accepts a block that maps keys and values to new keys and values.  [Feature #15143]
-
-  [Aliased method]
-
-    * Struct#filter is a new alias for Struct#select. [Feature #13784]
-
-[Time]
-
-  [New features]
-
-    * Time.new and Time#getlocal accept a timezone object as well as
-      a UTC offset string. Time#+, Time#-, and Time#succ also preserve
-      the timezone.  [Feature #14850]
-
-[TracePoint]
-
-  [New features]
-
-    * "script_compiled" event is supported. [Feature #15287]
-
-  [New methods]
-
-    * TracePoint#parameters [Feature #14694]
-
-    * TracePoint#instruction_sequence [Feature #15287]
-
-    * TracePoint#eval_script [Feature #15287]
-
-  [Modified methods]
-
-    * TracePoint#enable accepts new keywords "target:" and "target_line:".
-      [Feature #15289]
-
 === Stdlib updates (outstanding ones only)
 
-[BigDecimal]
-
-  Update to version 1.4.0.  This version includes several compatibility
-  issues, see Compatibility issues section below for details.
-
-  [Modified methods]
-
-  * BigDecimal() accepts the new keyword "exception:" similar to Float().
-
-  [Note for the differences among recent versions]
-
-  You should want to know the differences among recent versions of bigdecimal.
-  Please select the suitable version of bigdecimal according to the following
-  information.
-
-  * 1.3.5 has BigDecimal.new without "exception:" keyword.  You can see the
-    deprecation warning of BigDecimal.new when you specify "-w" option.
-    BigDecimal(), BigDecimal.new, and Object#to_d methods are the same.
-
-  * 1.4.0 has BigDecimal.new with "exception:" keyword.  You always see the
-    deprecation warning of BigDecimal.new.  Object#to_d method is different
-    from BigDecimal() and BigDecimal.new.
-
-  * 2.0.0 will be released soon after releasing Ruby 2.6.0.  This version
-    will not have the BigDecimal.new method.
-
-[Bundler]
-
-  * Add Bundler to Standard Library. [Feature #12733]
-
-  * Use 1.17.2, the latest stable version.
-
-[Coverage]
-
-  A oneshot_lines mode is added.  [Feature #15022]
-
-  This mode checks "whether each line was executed at least once or not",
-  instead of "how many times each line was executed".
-  A hook for each line is fired at most once, and after it is fired
-  the hook flag is removed, i.e., it runs with zero overhead.
-
-  [New options]
-
-    * Add +:oneshot_lines+ keyword argument to Coverage.start.
-
-    * Add +:stop+ and +:clear+ keyword arguments to Coverage.result.
-      If +clear+ is true, it clears the counters to zero.
-      If +stop+ is true, it disables coverage measurement.
-
-  [New methods]
-
-    * Coverage.line_stub, which is a simple helper function that
-      creates the "stub" of line coverage from a given source code.
-
-[CSV]
-
-  * Upgrade to 3.0.2. This includes performance improvements especially
-    for writing. Writing is about 2 times faster.
-    See https://github.com/ruby/csv/blob/master/NEWS.md.
-
-[ERB]
-
-  [New options]
-
-    * Add +:trim_mode+ and +:eoutvar+ keyword arguments to ERB.new.
-      Now non-keyword arguments other than the first one are softly deprecated
-      and will be removed when Ruby 2.5 becomes EOL. [Feature #14256]
-
-    * erb command's <tt>-S</tt> option is deprecated, and will be removed
-      in the next version.
-
-[FileUtils]
-
-  [New methods]
-
-    * FileUtils#cp_lr.  [Feature #4189]
-
-[Matrix]
-
-  [New methods]
-
-    * Matrix#antisymmetric?, Matrix#skew_symmetric?
-
-    * Matrix#map!, Matrix#collect! [Feature #14151]
-
-    * Matrix#[]=
-
-    * Vector#map!, Vector#collect!
-
-    * Vector#[]=
-
-[Net]
-
-  [New options]
-
-    * Add +:write_timeout+ keyword argument to Net::HTTP.new. [Feature #13396]
-
-  [New methods]
-
-    * Add Net::HTTP#write_timeout and Net::HTTP#write_timeout=.  [Feature #13396]
-
-  [New constant]
-
-    * Add Net::HTTPClientException to deprecate Net::HTTPServerException,
-      whose name is misleading.  [Bug #14688]
-
-[NKF]
-
-  * Upgrade to nkf v2.1.5
-
-[Psych]
-
-  * Upgrade to Psych 3.1.0
-
-[RDoc]
-
-  * Become about 2 times faster.
-
-  * Use SOURCE_DATE_EPOCH to generate files.
-
-  * Fix method line number that slipped off.
-
-  * Enable <code>--width</code>, <code>--exclude</code>,
-    and <code>--line-numbers</code> that were ignored.
-
-  * Add support for blockquote by ">>>" in default markup notation.
-
-  * Add support for "Raises" lines in TomDoc notation.
-
-  * Fix syntax error output.
-
-  * Fix many parsing bugs.
-
-[REXML]
-
-  * Upgrade to REXML 3.1.9.
-    See https://github.com/ruby/rexml/blob/master/NEWS.md.
-
-  [Improved some XPath implementations]
-
-    * <code>concat()</code> function: Stringify all arguments before concatenating.
-
-    * <code>string()</code> function: Support context node.
-
-    * <code>string()</code> function: Support processing instruction node.
-
-    * Support <code>"*:#{ELEMENT_NAME}"</code> syntax in XPath 2.0.
-
-  [Fixed some XPath implementations]
-
-    * <code>"//#{ELEMENT_NAME}[#{POSITION}]"</code> case
-
-    * <code>string()</code> function: Fix <code>function(document)</code>
-      returns nodes that are out of root elements.
-
-    * <code>"/ #{ELEMENT_NAME} "</code> case
-
-    * <code>"/ #{ELEMENT_NAME} [ #{PREDICATE} ]"</code> case
-
-    * <code>"/ #{AXIS}::#{ELEMENT_NAME}"</code> case
-
-    * <code>"#{N}-#{M}"</code> case: One or more white spaces were required
-      before <code>"-"</code>
-
-    * <code>"/child::node()"</code> case
-
-    * <code>"#{FUNCTION}()/#{PATH}"</code> case
-
-    * <code>"@#{ATTRIBUTE}/parent::"</code> case
-
-    * <code>"name(#{NODE_SET})"</code> case
-
-[RSS]
-
-  [New options]
-
-    * RSS::Parser.parse now accepts options as Hash. +:validate+ ,
-      +:ignore_unknown_element+ , +:parser_class+ options are available.
-
-[RubyGems]
-
-  * Upgrade to RubyGems 3.0.1
-
-  * https://blog.rubygems.org/2018/12/19/3.0.0-released.html
-
-  * https://blog.rubygems.org/2018/12/23/3.0.1-released.html
-
-[Set]
-
-  [Aliased methods]
-
-    * Set#filter! is a new alias for Set#select!.  [Feature #13784]
-
-[URI]
-
-  [New constant]
-
-    * Add URI::File to handle the file URI scheme.  [Feature #14035]
-
 === Compatibility issues (excluding feature bug fixes)
 
-[Dir]
-
-  * Dir.glob with <code>'\0'</code>-separated pattern list will be deprecated,
-    and is now warned.  [Feature #14643]
-
-[File]
-
-  * File.read, File.binread, File.write, File.binwrite, File.foreach, and
-    File.readlines do not invoke external commands even if the path starts
-    with the pipe character <code>'|'</code>. [Feature #14245]
-
-[Object]
-
-  * Object#=~ is deprecated.  [Feature #15231]
-
 === Stdlib compatibility issues (excluding feature bug fixes)
 
-* These standard libraries have been promoted to default gems.
-
-  * e2mmap
-  * forwardable
-  * irb
-  * logger
-  * matrix
-  * mutex_m
-  * ostruct
-  * prime
-  * rexml
-  * rss
-  * shell
-  * sync
-  * thwait
-  * tracer
-
-[BigDecimal]
-
-  * The following methods are removed.
-
-    * BigDecimal.allocate
-    * BigDecimal.ver
-
-  * Every BigDecimal object is frozen. [Feature #13984]
-
-  * BigDecimal() parses the given string similar to Float().
-
-  * String#to_d parses the receiver string similar to String#to_f.
-
-  * BigDecimal.new will be removed in version 2.0.
-
-[Pathname]
-
-  * Pathname#read, Pathname#binread, Pathname#write, Pathname#binwrite,
-    Pathname#each_line and Pathname#readlines do not invoke external
-    commands even if the path starts with the pipe character <code>'|'</code>.
-    This follows [Feature #14245].
-
 === C API updates
 
 === Implementation improvements
 
-* Speedup Proc#call because we don't need to care about <code>$SAFE</code>
-  any more. [Feature #14318]
-
-  With +lc_fizzbuzz+ benchmark which uses Proc#call many times we can
-  measure x1.4 improvements.  [Bug #10212]
-
-* Speedup block.call where +block+ is passed block parameter. [Feature #14330]
-
-  Ruby 2.5 improves block passing performance. [Feature #14045]
-
-  Additionally, Ruby 2.6 improves the performance of passed block calling.
-
-* Introduce an initial implementation of a JIT (Just-in-time) compiler. [Feature #14235] [experimental]
-
-  * <tt>--jit</tt> command line option is added to enable JIT. <tt>--jit-verbose=1</tt>
-    is good for inspection.  See <tt>ruby --help</tt> for others.
-  * To generate machine code, this JIT compiler uses the C compiler used for building
-    the interpreter. Currently GCC, Clang, and Microsoft Visual C++ are supported for it.
-  * <tt>--disable-mjit-support</tt> option is added to configure. This is added for JIT debugging,
-    but if you get an error on building a header file for JIT, you can use this option to skip
-    building it as a workaround.
-  * rb_waitpid reimplemented on Unix-like platforms to maintain
-    compatibility with processes created for JIT [Bug #14867]
-
-* VM generator script renewal; makes the generated VM more optimized. [GH-1779]
-
-* Thread cache enabled for pthreads platforms (for Thread.new and
-  Thread.start).  [Feature #14757]
-
-* timer thread is eliminated for platforms with POSIX timers. [Misc #14937]
-
-* Transient Heap (theap) is supported. [Bug #14858] [Feature #14989]
-
-  theap is a managed heap for short-living memory objects. For example,
-  making a small and short-living Hash object is x2 faster. With rdoc benchmark,
-  we measured 6-7% performance improvement.
-
-* Native implementations (arm32, arm64, ppc64le, win32, win64, x86, amd64) of
-  coroutines to improve performance of Fiber significantly. [Feature #14739]
-
 === Miscellaneous changes
-
-* On macOS, shared libraries no longer include a full version number of Ruby
-  in their names.  This eliminates the burden of each teeny upgrade on the
-  platform that users need to rebuild every extension library.
-
-  [Before]
-    * libruby.2.6.0.dylib
-    * libruby.2.6.dylib -> libruby.2.6.0.dylib
-    * libruby.dylib -> libruby.2.6.0.dylib
-
-  [After]
-    * libruby.2.6.dylib
-    * libruby.dylib -> libruby.2.6.dylib
-
-* Extracted misc/*.el files to https://github.com/ruby/elisp