Update to ruby/spec@fd6eddd

26 files changed, 501 insertions, 84 deletions

diff --git a/spec/ruby/.rubocop.yml b/spec/ruby/.rubocop.yml
index a26b525b1c..60b42cff7f 100644
--- a/spec/ruby/.rubocop.yml
+++ b/spec/ruby/.rubocop.yml
@@ -95,6 +95,7 @@ Lint/UnreachableCode:
     - 'core/kernel/raise_spec.rb'
     - 'core/kernel/throw_spec.rb'
     - 'language/break_spec.rb'
+    - 'language/optional_assignments_spec.rb'
     - 'language/fixtures/break.rb'
     - 'language/fixtures/break_lambda_toplevel.rb'
     - 'language/fixtures/break_lambda_toplevel_block.rb'
diff --git a/spec/ruby/core/enumerable/chunk_spec.rb b/spec/ruby/core/enumerable/chunk_spec.rb
index 548544f4e8..c5579d67fa 100644
--- a/spec/ruby/core/enumerable/chunk_spec.rb
+++ b/spec/ruby/core/enumerable/chunk_spec.rb
@@ -35,6 +35,11 @@ describe "Enumerable#chunk" do
     result.should == [[:_alone, [1]], [false, [2, 3, 2]], [:_alone, [1]]]
   end
 
+  it "yields Arrays as a single argument to a rest argument" do
+    e = EnumerableSpecs::Numerous.new([1, 2])
+    result = e.chunk { |*x| x.should == [[1,2]] }.to_a
+  end
+
   it "does not return elements for which the block returns :_separator" do
     e = EnumerableSpecs::Numerous.new(1, 2, 3, 3, 2, 1)
     result = e.chunk { |x| x == 2 ? :_separator : 1 }.to_a
diff --git a/spec/ruby/core/exception/interrupt_spec.rb b/spec/ruby/core/exception/interrupt_spec.rb
index 14f294bec6..a7501efadc 100644
--- a/spec/ruby/core/exception/interrupt_spec.rb
+++ b/spec/ruby/core/exception/interrupt_spec.rb
@@ -29,7 +29,23 @@ describe "rescuing Interrupt" do
       sleep
     rescue Interrupt => e
       e.signo.should == Signal.list["INT"]
-      e.signm.should == ""
+      ["", "Interrupt"].should.include?(e.message)
     end
   end
 end
+
+describe "Interrupt" do
+  # This spec is basically the same as above,
+  # but it does not rely on Signal.trap(:INT, :SIG_DFL) which can be tricky
+  it "is raised on the main Thread by the default SIGINT handler" do
+    out = ruby_exe(<<-'RUBY', args: "2>&1")
+    begin
+      Process.kill :INT, Process.pid
+      sleep
+    rescue Interrupt => e
+      puts "Interrupt: #{e.signo}"
+    end
+    RUBY
+    out.should == "Interrupt: #{Signal.list["INT"]}\n"
+  end
+end
diff --git a/spec/ruby/core/exception/result_spec.rb b/spec/ruby/core/exception/result_spec.rb
index 2f12673295..d42fcdffcb 100644
--- a/spec/ruby/core/exception/result_spec.rb
+++ b/spec/ruby/core/exception/result_spec.rb
@@ -14,10 +14,8 @@ describe "StopIteration#result" do
   it "returns the method-returned-object from an Enumerator" do
     @enum.next
     @enum.next
-    -> { @enum.next }.should(
-      raise_error(StopIteration) do |error|
-        error.result.should equal(:method_returned)
-      end
-    )
+    -> { @enum.next }.should raise_error(StopIteration) { |error|
+      error.result.should equal(:method_returned)
+    }
   end
 end
diff --git a/spec/ruby/core/gc/stat_spec.rb b/spec/ruby/core/gc/stat_spec.rb
index 51bd00c7c7..34656c401c 100644
--- a/spec/ruby/core/gc/stat_spec.rb
+++ b/spec/ruby/core/gc/stat_spec.rb
@@ -1,16 +1,40 @@
 require_relative '../../spec_helper'
 
 describe "GC.stat" do
-  it "supports access by key" do
-    keys = [:heap_free_slots, :total_allocated_objects, :count]
-    keys.each do |key|
-      GC.stat(key).should be_kind_of(Integer)
-    end
-  end
-
   it "returns hash of values" do
     stat = GC.stat
     stat.should be_kind_of(Hash)
     stat.keys.should include(:count)
   end
+
+  it "can return a single value" do
+    GC.stat(:count).should be_kind_of(Integer)
+  end
+
+  it "increases count after GC is run" do
+    count = GC.stat(:count)
+    GC.start
+    GC.stat(:count).should > count
+  end
+
+  it "increases major_gc_count after GC is run" do
+    count = GC.stat(:major_gc_count)
+    GC.start
+    GC.stat(:major_gc_count).should > count
+  end
+
+  it "provides some number for count" do
+    GC.stat(:count).should be_kind_of(Integer)
+    GC.stat[:count].should be_kind_of(Integer)
+  end
+
+  it "provides some number for heap_free_slots" do
+    GC.stat(:heap_free_slots).should be_kind_of(Integer)
+    GC.stat[:heap_free_slots].should be_kind_of(Integer)
+  end
+
+  it "provides some number for total_allocated_objects" do
+    GC.stat(:total_allocated_objects).should be_kind_of(Integer)
+    GC.stat[:total_allocated_objects].should be_kind_of(Integer)
+  end
 end
diff --git a/spec/ruby/core/kernel/raise_spec.rb b/spec/ruby/core/kernel/raise_spec.rb
index 591daa03cf..6dac132498 100644
--- a/spec/ruby/core/kernel/raise_spec.rb
+++ b/spec/ruby/core/kernel/raise_spec.rb
@@ -27,6 +27,27 @@ describe "Kernel#raise" do
 
     ScratchPad.recorded.should be_nil
   end
+
+  ruby_version_is "2.6" do
+    it "accepts a cause keyword argument that sets the cause" do
+      cause = StandardError.new
+      -> { raise("error", cause: cause) }.should raise_error(RuntimeError) { |e| e.cause.should == cause }
+    end
+
+    it "accepts a cause keyword argument that overrides the last exception" do
+      begin
+        raise "first raise"
+      rescue => ignored
+        cause = StandardError.new
+        -> { raise("error", cause: cause) }.should raise_error(RuntimeError) { |e| e.cause.should == cause }
+      end
+    end
+
+    it "raises an ArgumentError when only cause is given" do
+      cause = StandardError.new
+      -> { raise(cause: cause) }.should raise_error(ArgumentError)
+    end
+  end
 end
 
 describe "Kernel#raise" do
diff --git a/spec/ruby/core/kernel/sleep_spec.rb b/spec/ruby/core/kernel/sleep_spec.rb
index 71a3f24f13..32da6344c1 100644
--- a/spec/ruby/core/kernel/sleep_spec.rb
+++ b/spec/ruby/core/kernel/sleep_spec.rb
@@ -22,6 +22,12 @@ describe "Kernel#sleep" do
     sleep(Rational(1, 999)).should >= 0
   end
 
+  it "accepts any Object that reponds to divmod" do
+    o = Object.new
+    def o.divmod(*); [0, 0.001]; end
+    sleep(o).should >= 0
+  end
+
   it "raises an ArgumentError when passed a negative duration" do
     -> { sleep(-0.1) }.should raise_error(ArgumentError)
     -> { sleep(-1) }.should raise_error(ArgumentError)
diff --git a/spec/ruby/core/kernel/trap_spec.rb b/spec/ruby/core/kernel/trap_spec.rb
index 465aacb0fb..4c801a7215 100644
--- a/spec/ruby/core/kernel/trap_spec.rb
+++ b/spec/ruby/core/kernel/trap_spec.rb
@@ -1,12 +1,9 @@
 require_relative '../../spec_helper'
-require_relative 'fixtures/classes'
 
 describe "Kernel#trap" do
   it "is a private method" do
     Kernel.should have_private_instance_method(:trap)
   end
-end
 
-describe "Kernel.trap" do
-  it "needs to be reviewed for spec completeness"
+  # Behaviour is specified for Signal.trap
 end
diff --git a/spec/ruby/core/signal/trap_spec.rb b/spec/ruby/core/signal/trap_spec.rb
index 45879b7147..61d39cfa93 100644
--- a/spec/ruby/core/signal/trap_spec.rb
+++ b/spec/ruby/core/signal/trap_spec.rb
@@ -1,11 +1,12 @@
 require_relative '../../spec_helper'
 
-platform_is_not :windows do
-  describe "Signal.trap" do
+describe "Signal.trap" do
+  platform_is_not :windows do
     before :each do
       ScratchPad.clear
       @proc = -> {}
       @saved_trap = Signal.trap(:HUP, @proc)
+      @hup_number = Signal.list["HUP"]
     end
 
     after :each do
@@ -16,10 +17,11 @@ platform_is_not :windows do
       Signal.trap(:HUP, @saved_trap).should equal(@proc)
     end
 
-    it "accepts a block in place of a proc/command argument" do
+    it "accepts a block" do
       done = false
 
-      Signal.trap(:HUP) do
+      Signal.trap(:HUP) do |signo|
+        signo.should == @hup_number
         ScratchPad.record :block_trap
         done = true
       end
@@ -30,6 +32,94 @@ platform_is_not :windows do
       ScratchPad.recorded.should == :block_trap
     end
 
+    it "accepts a proc" do
+      done = false
+
+      handler = -> signo {
+        signo.should == @hup_number
+        ScratchPad.record :proc_trap
+        done = true
+      }
+
+      Signal.trap(:HUP, handler)
+
+      Process.kill :HUP, Process.pid
+      Thread.pass until done
+
+      ScratchPad.recorded.should == :proc_trap
+    end
+
+    it "accepts a method" do
+      done = false
+
+      handler_class = Class.new
+      hup_number = @hup_number
+
+      handler_class.define_method :handler_method do |signo|
+        signo.should == hup_number
+        ScratchPad.record :method_trap
+        done = true
+      end
+
+      handler_method = handler_class.new.method(:handler_method)
+
+      Signal.trap(:HUP, handler_method)
+
+      Process.kill :HUP, Process.pid
+      Thread.pass until done
+
+      ScratchPad.recorded.should == :method_trap
+    end
+
+    it "accepts anything you can call" do
+      done = false
+
+      callable = Object.new
+      hup_number = @hup_number
+
+      callable.singleton_class.define_method :call do |signo|
+        signo.should == hup_number
+        ScratchPad.record :callable_trap
+        done = true
+      end
+
+      Signal.trap(:HUP, callable)
+
+      Process.kill :HUP, Process.pid
+      Thread.pass until done
+
+      ScratchPad.recorded.should == :callable_trap
+    end
+
+    it "raises an exception for a non-callable at the point of use" do
+      not_callable = Object.new
+      Signal.trap(:HUP, not_callable)
+      -> {
+        Process.kill :HUP, Process.pid
+        loop { Thread.pass }
+      }.should raise_error(NoMethodError)
+    end
+
+    it "accepts a non-callable that becomes callable when used" do
+      done = false
+
+      late_callable = Object.new
+      hup_number = @hup_number
+
+      Signal.trap(:HUP, late_callable)
+
+      late_callable.singleton_class.define_method :call do |signo|
+        signo.should == hup_number
+        ScratchPad.record :late_callable_trap
+        done = true
+      end
+
+      Process.kill :HUP, Process.pid
+      Thread.pass until done
+
+      ScratchPad.recorded.should == :late_callable_trap
+    end
+
     it "is possible to create a new Thread when the handler runs" do
       done = false
 
@@ -130,14 +220,12 @@ platform_is_not :windows do
       Signal.trap :HUP, @proc
       Signal.trap(:HUP, @saved_trap).should equal(@proc)
     end
-  end
 
-  describe "Signal.trap" do
     # See man 2 signal
     %w[KILL STOP].each do |signal|
       it "raises ArgumentError or Errno::EINVAL for SIG#{signal}" do
         -> {
-          trap(signal, -> {})
+          Signal.trap(signal, -> {})
         }.should raise_error(StandardError) { |e|
           [ArgumentError, Errno::EINVAL].should include(e.class)
           e.message.should =~ /Invalid argument|Signal already used by VM or OS/
@@ -152,7 +240,7 @@ platform_is_not :windows do
     end
 
     it "returns 'DEFAULT' for the initial SIGINT handler" do
-      ruby_exe('print trap(:INT) { abort }').should == 'DEFAULT'
+      ruby_exe("print Signal.trap(:INT) { abort }").should == 'DEFAULT'
     end
 
     it "returns SYSTEM_DEFAULT if passed DEFAULT and no handler was ever set" do
@@ -174,23 +262,22 @@ platform_is_not :windows do
       Signal.signame(status.termsig).should == "PIPE"
     end
   end
-end
 
-describe "Signal.trap" do
   describe "the special EXIT signal code" do
     it "accepts the EXIT code" do
-      code = "trap(:EXIT, proc { print 1 })"
+      code = "Signal.trap(:EXIT, proc { print 1 })"
       ruby_exe(code).should == "1"
     end
 
     it "runs the proc before at_exit handlers" do
-      code = "at_exit {print 1}; trap(:EXIT, proc {print 2}); at_exit {print 3}"
+      code = "at_exit {print 1}; Signal.trap(:EXIT, proc {print 2}); at_exit {print 3}"
       ruby_exe(code).should == "231"
     end
 
     it "can unset the handler" do
-      code = "trap(:EXIT, proc { print 1 }); trap(:EXIT, 'DEFAULT')"
+      code = "Signal.trap(:EXIT, proc { print 1 }); Signal.trap(:EXIT, 'DEFAULT')"
       ruby_exe(code).should == ""
     end
   end
+
 end
diff --git a/spec/ruby/core/time/at_spec.rb b/spec/ruby/core/time/at_spec.rb
index 4ff38bbd21..ff43537dcc 100644
--- a/spec/ruby/core/time/at_spec.rb
+++ b/spec/ruby/core/time/at_spec.rb
@@ -38,6 +38,20 @@ describe "Time.at" do
         Time.at(BigDecimal('1.1')).to_f.should == 1.1
       end
     end
+
+    describe "passed Rational" do
+      it "returns Time with correct microseconds" do
+        t = Time.at(Rational(1_486_570_508_539_759, 1_000_000))
+        t.usec.should == 539_759
+        t.nsec.should == 539_759_000
+      end
+
+      it "returns Time with correct nanoseconds" do
+        t = Time.at(Rational(1_486_570_508_539_759_123, 1_000_000_000))
+        t.usec.should == 539_759
+        t.nsec.should == 539_759_123
+      end
+    end
   end
 
   describe "passed Time" do
diff --git a/spec/ruby/language/constants_spec.rb b/spec/ruby/language/constants_spec.rb
index 6d3b1a5dd7..760b9d4a24 100644
--- a/spec/ruby/language/constants_spec.rb
+++ b/spec/ruby/language/constants_spec.rb
@@ -381,52 +381,6 @@ describe "Constant resolution within methods" do
     ConstantSpecs::ClassA.constx.should == :CS_CONSTX
     ConstantSpecs::ClassA.new.constx.should == :CS_CONSTX
   end
-
-  describe "with ||=" do
-    it "assigns a scoped constant if previously undefined" do
-      ConstantSpecs.should_not have_constant(:OpAssignUndefined)
-      module ConstantSpecs
-        OpAssignUndefined ||= 42
-      end
-      ConstantSpecs::OpAssignUndefined.should == 42
-      ConstantSpecs::OpAssignUndefinedOutside ||= 42
-      ConstantSpecs::OpAssignUndefinedOutside.should == 42
-      ConstantSpecs.send(:remove_const, :OpAssignUndefined)
-      ConstantSpecs.send(:remove_const, :OpAssignUndefinedOutside)
-    end
-
-    it "assigns a global constant if previously undefined" do
-      OpAssignGlobalUndefined ||= 42
-      ::OpAssignGlobalUndefinedExplicitScope ||= 42
-      OpAssignGlobalUndefined.should == 42
-      ::OpAssignGlobalUndefinedExplicitScope.should == 42
-      Object.send :remove_const, :OpAssignGlobalUndefined
-      Object.send :remove_const, :OpAssignGlobalUndefinedExplicitScope
-    end
-
-  end
-
-  describe "with &&=" do
-    it "re-assigns a scoped constant if already true" do
-      module ConstantSpecs
-        OpAssignTrue = true
-      end
-      suppress_warning do
-        ConstantSpecs::OpAssignTrue &&= 1
-      end
-      ConstantSpecs::OpAssignTrue.should == 1
-      ConstantSpecs.send :remove_const, :OpAssignTrue
-    end
-
-    it "leaves scoped constant if not true" do
-      module ConstantSpecs
-        OpAssignFalse = false
-      end
-      ConstantSpecs::OpAssignFalse &&= 1
-      ConstantSpecs::OpAssignFalse.should == false
-      ConstantSpecs.send :remove_const, :OpAssignFalse
-    end
-  end
 end
 
 describe "Constant resolution within a singleton class (class << obj)" do
diff --git a/spec/ruby/language/ensure_spec.rb b/spec/ruby/language/ensure_spec.rb
index e94c523e82..e893904bcb 100644
--- a/spec/ruby/language/ensure_spec.rb
+++ b/spec/ruby/language/ensure_spec.rb
@@ -74,9 +74,9 @@ describe "An ensure block inside a begin block" do
       ensure
         raise "from ensure"
       end
-    }.should raise_error(RuntimeError, "from ensure") do |e|
+    }.should raise_error(RuntimeError, "from ensure") { |e|
       e.cause.message.should == "from block"
-    end
+    }
   end
 end
 
diff --git a/spec/ruby/language/hash_spec.rb b/spec/ruby/language/hash_spec.rb
index d6600ddb4a..afc0df12a2 100644
--- a/spec/ruby/language/hash_spec.rb
+++ b/spec/ruby/language/hash_spec.rb
@@ -167,3 +167,42 @@ describe "Hash literal" do
     usascii_hash.keys.first.encoding.should == Encoding::US_ASCII
   end
 end
+
+describe "The ** operator" do
+  it "makes a copy when calling a method taking a keyword rest argument" do
+    def m(**h)
+      h.delete(:one); h
+    end
+
+    h = { one: 1, two: 2 }
+    m(**h).should == { two: 2 }
+    m(**h).should_not.equal?(h)
+    h.should == { one: 1, two: 2 }
+  end
+
+  ruby_version_is ""..."3.0" do
+    it "makes a caller-side copy when calling a method taking a positional Hash" do
+      def m(h)
+        h.delete(:one); h
+      end
+
+      h = { one: 1, two: 2 }
+      m(**h).should == { two: 2 }
+      m(**h).should_not.equal?(h)
+      h.should == { one: 1, two: 2 }
+    end
+  end
+
+  ruby_version_is "3.0" do
+    it "does not copy when calling a method taking a positional Hash" do
+      def m(h)
+        h.delete(:one); h
+      end
+
+      h = { one: 1, two: 2 }
+      m(**h).should == { two: 2 }
+      m(**h).should.equal?(h)
+      h.should == { two: 2 }
+    end
+  end
+end
diff --git a/spec/ruby/language/method_spec.rb b/spec/ruby/language/method_spec.rb
index 462a182b3d..449d5e6f1b 100644
--- a/spec/ruby/language/method_spec.rb
+++ b/spec/ruby/language/method_spec.rb
@@ -1758,6 +1758,17 @@ describe "A method" do
       end
     end
   end
+
+  it "assigns the last Hash to the last optional argument if the Hash contains non-Symbol keys and is not passed as keywords" do
+    def m(a = nil, b = {}, v: false)
+      [a, b, v]
+    end
+
+    h = { "key" => "value" }
+    m(:a, h).should == [:a, h, false]
+    m(:a, h, v: true).should == [:a, h, true]
+    m(v: true).should == [nil, {}, true]
+  end
 end
 
 describe "A method call with a space between method name and parentheses" do
diff --git a/spec/ruby/language/optional_assignments_spec.rb b/spec/ruby/language/optional_assignments_spec.rb
index 3d9e0dbb65..217dcab74b 100644
--- a/spec/ruby/language/optional_assignments_spec.rb
+++ b/spec/ruby/language/optional_assignments_spec.rb
@@ -1,4 +1,5 @@
 require_relative '../spec_helper'
+require_relative '../fixtures/constants'
 
 describe 'Optional variable assignments' do
   describe 'using ||=' do
@@ -351,3 +352,107 @@ describe 'Optional variable assignments' do
     end
   end
 end
+
+describe 'Optional constant assignment' do
+  describe 'with ||=' do
+    it "assigns a scoped constant if previously undefined" do
+      ConstantSpecs.should_not have_constant(:OpAssignUndefined)
+      module ConstantSpecs
+        OpAssignUndefined ||= 42
+      end
+      ConstantSpecs::OpAssignUndefined.should == 42
+      ConstantSpecs::OpAssignUndefinedOutside ||= 42
+      ConstantSpecs::OpAssignUndefinedOutside.should == 42
+      ConstantSpecs.send(:remove_const, :OpAssignUndefined)
+      ConstantSpecs.send(:remove_const, :OpAssignUndefinedOutside)
+    end
+
+    it "assigns a global constant if previously undefined" do
+      OpAssignGlobalUndefined ||= 42
+      ::OpAssignGlobalUndefinedExplicitScope ||= 42
+      OpAssignGlobalUndefined.should == 42
+      ::OpAssignGlobalUndefinedExplicitScope.should == 42
+      Object.send :remove_const, :OpAssignGlobalUndefined
+      Object.send :remove_const, :OpAssignGlobalUndefinedExplicitScope
+    end
+
+    it 'correctly defines non-existing constants' do
+      ConstantSpecs::ClassA::OR_ASSIGNED_CONSTANT1 ||= :assigned
+      ConstantSpecs::ClassA::OR_ASSIGNED_CONSTANT1.should == :assigned
+    end
+
+    it 'correctly overwrites nil constants' do
+      suppress_warning do # already initialized constant
+      ConstantSpecs::ClassA::NIL_OR_ASSIGNED_CONSTANT1 = nil
+      ConstantSpecs::ClassA::NIL_OR_ASSIGNED_CONSTANT1 ||= :assigned
+      ConstantSpecs::ClassA::NIL_OR_ASSIGNED_CONSTANT1.should == :assigned
+      end
+    end
+
+    it 'causes side-effects of the module part to be applied only once (for undefined constant)' do
+      x = 0
+      (x += 1; ConstantSpecs::ClassA)::OR_ASSIGNED_CONSTANT2 ||= :assigned
+      x.should == 1
+      ConstantSpecs::ClassA::OR_ASSIGNED_CONSTANT2.should == :assigned
+    end
+
+    it 'causes side-effects of the module part to be applied (for nil constant)' do
+      suppress_warning do # already initialized constant
+      ConstantSpecs::ClassA::NIL_OR_ASSIGNED_CONSTANT2 = nil
+      x = 0
+      (x += 1; ConstantSpecs::ClassA)::NIL_OR_ASSIGNED_CONSTANT2 ||= :assigned
+      x.should == 1
+      ConstantSpecs::ClassA::NIL_OR_ASSIGNED_CONSTANT2.should == :assigned
+      end
+    end
+
+    it 'does not evaluate the right-hand side if the module part raises an exception (for undefined constant)' do
+      x = 0
+      y = 0
+
+      -> {
+        (x += 1; raise Exception; ConstantSpecs::ClassA)::OR_ASSIGNED_CONSTANT3 ||= (y += 1; :assigned)
+      }.should raise_error(Exception)
+
+      x.should == 1
+      y.should == 0
+      defined?(ConstantSpecs::ClassA::OR_ASSIGNED_CONSTANT3).should == nil
+    end
+
+    it 'does not evaluate the right-hand side if the module part raises an exception (for nil constant)' do
+      ConstantSpecs::ClassA::NIL_OR_ASSIGNED_CONSTANT3 = nil
+      x = 0
+      y = 0
+
+      -> {
+        (x += 1; raise Exception; ConstantSpecs::ClassA)::NIL_OR_ASSIGNED_CONSTANT3 ||= (y += 1; :assigned)
+      }.should raise_error(Exception)
+
+      x.should == 1
+      y.should == 0
+      ConstantSpecs::ClassA::NIL_OR_ASSIGNED_CONSTANT3.should == nil
+    end
+  end
+
+  describe "with &&=" do
+    it "re-assigns a scoped constant if already true" do
+      module ConstantSpecs
+        OpAssignTrue = true
+      end
+      suppress_warning do
+        ConstantSpecs::OpAssignTrue &&= 1
+      end
+      ConstantSpecs::OpAssignTrue.should == 1
+      ConstantSpecs.send :remove_const, :OpAssignTrue
+    end
+
+    it "leaves scoped constant if not true" do
+      module ConstantSpecs
+        OpAssignFalse = false
+      end
+      ConstantSpecs::OpAssignFalse &&= 1
+      ConstantSpecs::OpAssignFalse.should == false
+      ConstantSpecs.send :remove_const, :OpAssignFalse
+    end
+  end
+end
diff --git a/spec/ruby/language/regexp/grouping_spec.rb b/spec/ruby/language/regexp/grouping_spec.rb
index 2fecf2d2cb..e2abe71d0d 100644
--- a/spec/ruby/language/regexp/grouping_spec.rb
+++ b/spec/ruby/language/regexp/grouping_spec.rb
@@ -25,4 +25,11 @@ describe "Regexps with grouping" do
     -> { Regexp.new("(?<1a>a)") }.should raise_error(RegexpError)
     -> { Regexp.new("(?<-a>a)") }.should raise_error(RegexpError)
   end
+
+  it "ignore capture groups in line comments" do
+    /^
+     (a) # there is a capture group on this line
+     b   # there is no capture group on this line (not even here)
+     $/x.match("ab").to_a.should == [ "ab", "a" ]
+  end
 end
diff --git a/spec/ruby/language/rescue_spec.rb b/spec/ruby/language/rescue_spec.rb
index 54cbae1440..1c78f3935a 100644
--- a/spec/ruby/language/rescue_spec.rb
+++ b/spec/ruby/language/rescue_spec.rb
@@ -428,9 +428,9 @@ describe "The rescue keyword" do
         raise "from block"
       rescue (raise "from rescue expression")
       end
-    }.should raise_error(RuntimeError, "from rescue expression") do |e|
+    }.should raise_error(RuntimeError, "from rescue expression") { |e|
       e.cause.message.should == "from block"
-    end
+    }
   end
 
   it "should splat the handling Error classes" do
diff --git a/spec/ruby/language/string_spec.rb b/spec/ruby/language/string_spec.rb
index 0178083f58..ce4941569e 100644
--- a/spec/ruby/language/string_spec.rb
+++ b/spec/ruby/language/string_spec.rb
@@ -308,4 +308,14 @@ describe "Ruby String interpolation" do
       eval(code).should_not.frozen?
     end
   end
+
+  ruby_version_is ""..."3.0" do
+    it "creates a frozen String when # frozen-string-literal: true is used" do
+      code = <<~'RUBY'
+      # frozen-string-literal: true
+      "a#{6*7}c"
+      RUBY
+      eval(code).should.frozen?
+    end
+  end
 end
diff --git a/spec/ruby/library/monitor/synchronize_spec.rb b/spec/ruby/library/monitor/synchronize_spec.rb
new file mode 100644
index 0000000000..d851b98d6c
--- /dev/null
+++ b/spec/ruby/library/monitor/synchronize_spec.rb
@@ -0,0 +1,30 @@
+require_relative '../../spec_helper'
+require 'monitor'
+
+describe "Monitor#synchronize" do
+  it "unlocks after return, even if it was interrupted by Thread#raise" do
+    exc_class = Class.new(RuntimeError)
+
+    monitor = Monitor.new
+    10.times do
+      locked = false
+
+      thread = Thread.new do
+        begin
+          monitor.synchronize do
+            locked = true
+            # Do not wait here, we are trying to interrupt the ensure part of #synchronize
+          end
+          sleep # wait for exception if it did not happen yet
+        rescue exc_class
+          monitor.should_not.mon_locked?
+          :ok
+        end
+      end
+
+      Thread.pass until locked
+      thread.raise exc_class, "interrupt"
+      thread.value.should == :ok
+    end
+  end
+end
diff --git a/spec/ruby/library/socket/socket/udp_server_loop_spec.rb b/spec/ruby/library/socket/socket/udp_server_loop_spec.rb
index 66563bc742..fc030e75b9 100644
--- a/spec/ruby/library/socket/socket/udp_server_loop_spec.rb
+++ b/spec/ruby/library/socket/socket/udp_server_loop_spec.rb
@@ -21,7 +21,7 @@ describe 'Socket.udp_server_loop' do
     it 'yields the message and a Socket::UDPSource' do
       msg, src = nil
 
-      Thread.new do
+      thread = Thread.new do
         SocketSpecs::ServerLoopPortFinder.udp_server_loop('127.0.0.1', 0) do |message, source|
           msg = message
           src = source
@@ -52,6 +52,8 @@ describe 'Socket.udp_server_loop' do
 
       msg.should == 'hello'
       src.should be_an_instance_of(Socket::UDPSource)
+
+      thread.join
     end
   end
 end
diff --git a/spec/ruby/library/weakref/fixtures/classes.rb b/spec/ruby/library/weakref/fixtures/classes.rb
index 560c58b041..041afab14d 100644
--- a/spec/ruby/library/weakref/fixtures/classes.rb
+++ b/spec/ruby/library/weakref/fixtures/classes.rb
@@ -13,9 +13,11 @@ class WeakRefSpec
   def self.make_dead_weakref
     weaks = []
     weak = nil
-    10_000.times do
+    1000.times do
       weaks << make_weakref
-      GC.start
+    end
+
+    1000.times do
       GC.start
       break if weak = weaks.find { |w| !w.weakref_alive? }
     end
diff --git a/spec/ruby/optional/capi/ext/kernel_spec.c b/spec/ruby/optional/capi/ext/kernel_spec.c
index a1960a2fe7..bbfeb198b7 100644
--- a/spec/ruby/optional/capi/ext/kernel_spec.c
+++ b/spec/ruby/optional/capi/ext/kernel_spec.c
@@ -191,6 +191,14 @@ static VALUE kernel_spec_rb_protect_yield(VALUE self, VALUE obj, VALUE ary) {
   return res;
 }
 
+static VALUE kernel_spec_rb_protect_errinfo(VALUE self, VALUE obj, VALUE ary) {
+  int status = 0;
+  VALUE res = rb_protect(rb_yield, obj, &status);
+  rb_ary_store(ary, 0, INT2NUM(23));
+  rb_ary_store(ary, 1, res);
+  return rb_errinfo();
+}
+
 static VALUE kernel_spec_rb_protect_null_status(VALUE self, VALUE obj) {
   return rb_protect(rb_yield, obj, NULL);
 }
@@ -345,6 +353,7 @@ void Init_kernel_spec(void) {
   rb_define_method(cls, "rb_rescue", kernel_spec_rb_rescue, 4);
   rb_define_method(cls, "rb_rescue2", kernel_spec_rb_rescue2, -1);
   rb_define_method(cls, "rb_protect_yield", kernel_spec_rb_protect_yield, 2);
+  rb_define_method(cls, "rb_protect_errinfo", kernel_spec_rb_protect_errinfo, 2);
   rb_define_method(cls, "rb_protect_null_status", kernel_spec_rb_protect_null_status, 1);
   rb_define_method(cls, "rb_eval_string_protect", kernel_spec_rb_eval_string_protect, 2);
   rb_define_method(cls, "rb_catch", kernel_spec_rb_catch, 2);
diff --git a/spec/ruby/optional/capi/ext/module_spec.c b/spec/ruby/optional/capi/ext/module_spec.c
index 3c8455a942..7475994fa1 100644
--- a/spec/ruby/optional/capi/ext/module_spec.c
+++ b/spec/ruby/optional/capi/ext/module_spec.c
@@ -9,6 +9,18 @@ static VALUE module_specs_test_method(VALUE self) {
   return ID2SYM(rb_intern("test_method"));
 }
 
+static VALUE module_specs_test_method_2required(VALUE self, VALUE arg1, VALUE arg2) {
+    return ID2SYM(rb_intern("test_method_2required"));
+}
+
+static VALUE module_specs_test_method_c_array(int argc, VALUE *argv, VALUE self) {
+    return ID2SYM(rb_intern("test_method_c_array"));
+}
+
+static VALUE module_specs_test_method_ruby_array(VALUE self, VALUE args) {
+    return ID2SYM(rb_intern("test_method_ruby_array"));
+}
+
 static VALUE module_specs_const_defined(VALUE self, VALUE klass, VALUE id) {
   return rb_const_defined(klass, SYM2ID(id)) ? Qtrue : Qfalse;
 }
@@ -76,6 +88,21 @@ static VALUE module_specs_rb_define_method(VALUE self, VALUE cls, VALUE str_name
   return Qnil;
 }
 
+static VALUE module_specs_rb_define_method_2required(VALUE self, VALUE cls, VALUE str_name) {
+  rb_define_method(cls, RSTRING_PTR(str_name), module_specs_test_method_2required, 2);
+  return Qnil;
+}
+
+static VALUE module_specs_rb_define_method_c_array(VALUE self, VALUE cls, VALUE str_name) {
+  rb_define_method(cls, RSTRING_PTR(str_name), module_specs_test_method_c_array, -1);
+  return Qnil;
+}
+
+static VALUE module_specs_rb_define_method_ruby_array(VALUE self, VALUE cls, VALUE str_name) {
+  rb_define_method(cls, RSTRING_PTR(str_name), module_specs_test_method_ruby_array, -2);
+  return Qnil;
+}
+
 static VALUE module_specs_rb_define_module_function(VALUE self, VALUE cls, VALUE str_name) {
   rb_define_module_function(cls, RSTRING_PTR(str_name), module_specs_test_method, 0);
   return Qnil;
@@ -132,6 +159,10 @@ void Init_module_spec(void) {
       module_specs_rb_define_global_function, 1);
 
   rb_define_method(cls, "rb_define_method", module_specs_rb_define_method, 2);
+  rb_define_method(cls, "rb_define_method_2required", module_specs_rb_define_method_2required, 2);
+  rb_define_method(cls, "rb_define_method_c_array", module_specs_rb_define_method_c_array, 2);
+  rb_define_method(cls, "rb_define_method_ruby_array", module_specs_rb_define_method_ruby_array, 2);
+
   rb_define_method(cls, "rb_define_module_function",
       module_specs_rb_define_module_function, 2);
 
diff --git a/spec/ruby/optional/capi/kernel_spec.rb b/spec/ruby/optional/capi/kernel_spec.rb
index ab66f7fa9e..758d944da9 100644
--- a/spec/ruby/optional/capi/kernel_spec.rb
+++ b/spec/ruby/optional/capi/kernel_spec.rb
@@ -312,6 +312,14 @@ describe "C-API Kernel function" do
       @s.rb_protect_null_status(42) { |x| x + 1 }.should == 43
       @s.rb_protect_null_status(42) { |x| raise }.should == nil
     end
+
+    it "populates errinfo with the captured exception" do
+      proof = []
+      @s.rb_protect_errinfo(77, proof) { |x| raise NameError }.class.should == NameError
+      proof[0].should == 23
+      proof[1].should == nil
+    end
+
   end
 
   describe "rb_eval_string_protect" do
diff --git a/spec/ruby/optional/capi/module_spec.rb b/spec/ruby/optional/capi/module_spec.rb
index 750d64367d..acf4d1fe48 100644
--- a/spec/ruby/optional/capi/module_spec.rb
+++ b/spec/ruby/optional/capi/module_spec.rb
@@ -246,12 +246,30 @@ describe "CApiModule" do
       cls.new.test_method.should == :test_method
     end
 
-    it "returns the correct arity of the method in class" do
+    it "returns the correct arity when argc of the method in class is 0" do
       cls = Class.new
       @m.rb_define_method(cls, "test_method")
       cls.new.method(:test_method).arity.should == 0
     end
 
+    it "returns the correct arity when argc of the method in class is -1" do
+      cls = Class.new
+      @m.rb_define_method_c_array(cls, "test_method_c_array")
+      cls.new.method(:test_method_c_array).arity.should == -1
+    end
+
+    it "returns the correct arity when argc of the method in class is -2" do
+      cls = Class.new
+      @m.rb_define_method_ruby_array(cls, "test_method_ruby_array")
+      cls.new.method(:test_method_ruby_array).arity.should == -1
+    end
+
+    it "returns the correct arity when argc of the method in class is 2" do
+      cls = Class.new
+      @m.rb_define_method_2required(cls, "test_method_2required")
+      cls.new.method(:test_method_2required).arity.should == 2
+    end
+
     it "defines a method on a module" do
       mod = Module.new
       @m.rb_define_method(mod, "test_method")
diff --git a/spec/ruby/shared/kernel/raise.rb b/spec/ruby/shared/kernel/raise.rb
index f00a6ef294..765ba0f929 100644
--- a/spec/ruby/shared/kernel/raise.rb
+++ b/spec/ruby/shared/kernel/raise.rb
@@ -12,6 +12,28 @@ describe :kernel_raise, shared: true do
     ScratchPad.recorded.should be_nil
   end
 
+  it "accepts an exception that implements to_hash" do
+    custom_error = Class.new(StandardError) do
+      def to_hash
+        {}
+      end
+    end
+    error = custom_error.new
+    -> { @object.raise(error) }.should raise_error(custom_error)
+  end
+
+  it "allows the message parameter to be a hash" do
+    data_error = Class.new(StandardError) do
+      attr_reader :data
+      def initialize(data)
+        @data = data
+      end
+    end
+    -> { @object.raise(data_error, {:data => 42}) }.should raise_error(data_error) do |ex|
+      ex.data.should == {:data => 42}
+    end
+  end
+
   it "raises RuntimeError if no exception class is given" do
     -> { @object.raise }.should raise_error(RuntimeError, "")
   end