merge revision(s) cd5e6cc0ea48353c88d921b885b552dc76da255c,bbf54ec334fe2edd7669a944d88d17efde49a412: [Backport #19307]

	Update to ruby/mspec@fef9b81

	---
	 spec/mspec/tool/tag_from_output.rb | 2 +-
	 1 file changed, 1 insertion(+), 1 deletion(-)

	Update to ruby/spec@9d69b95

	---
	 spec/ruby/core/array/keep_if_spec.rb               |   1 +
	 spec/ruby/core/array/pack/c_spec.rb                |  14 +-
	 spec/ruby/core/array/pack/shared/basic.rb          |  40 ++++
	 spec/ruby/core/array/pack/shared/float.rb          |  66 ++++++-
	 spec/ruby/core/array/pack/shared/integer.rb        |  96 +++++++--
	 spec/ruby/core/array/pack/shared/numeric_basic.rb  |  10 +-
	 spec/ruby/core/array/pack/shared/unicode.rb        |  14 +-
	 spec/ruby/core/array/pack/w_spec.rb                |  14 +-
	 spec/ruby/core/array/shared/unshift.rb             |  18 ++
	 spec/ruby/core/array/values_at_spec.rb             |   1 +
	 spec/ruby/core/array/zip_spec.rb                   |   6 +
	 spec/ruby/core/class/subclasses_spec.rb            |  22 +++
	 spec/ruby/core/dir/home_spec.rb                    |  44 +++--
	 spec/ruby/core/dir/mkdir_spec.rb                   |  18 +-
	 spec/ruby/core/enumerable/zip_spec.rb              |   5 +
	 spec/ruby/core/float/comparison_spec.rb            |  35 ++--
	 spec/ruby/core/float/divmod_spec.rb                |   2 +-
	 spec/ruby/core/float/gt_spec.rb                    |  21 ++
	 spec/ruby/core/float/gte_spec.rb                   |  21 ++
	 spec/ruby/core/float/lt_spec.rb                    |  21 ++
	 spec/ruby/core/float/lte_spec.rb                   |  21 ++
	 spec/ruby/core/float/shared/equal.rb               |  21 ++
	 spec/ruby/core/io/gets_spec.rb                     |   4 +
	 spec/ruby/core/io/lineno_spec.rb                   |   9 +-
	 spec/ruby/core/io/new_spec.rb                      |   2 +
	 spec/ruby/core/io/readline_spec.rb                 |   4 +
	 spec/ruby/core/io/readlines_spec.rb                |   4 +
	 spec/ruby/core/io/shared/each.rb                   |   4 +
	 spec/ruby/core/io/shared/new.rb                    |   2 +
	 spec/ruby/core/io/shared/pos.rb                    |   8 +-
	 spec/ruby/core/io/shared/readlines.rb              |   4 +
	 spec/ruby/core/io/sysseek_spec.rb                  |   2 +-
	 spec/ruby/core/kernel/shared/load.rb               |  31 ++-
	 spec/ruby/core/kernel/singleton_class_spec.rb      |   2 +
	 spec/ruby/core/marshal/dump_spec.rb                |  45 ++++-
	 spec/ruby/core/marshal/fixtures/classes.rb         |   4 +
	 spec/ruby/core/matchdata/values_at_spec.rb         |  73 ++++++-
	 spec/ruby/core/module/fixtures/classes.rb          |   1 +
	 spec/ruby/core/module/include_spec.rb              |   4 +-
	 spec/ruby/core/module/prepend_spec.rb              |  12 ++
	 .../ruby/core/objectspace/define_finalizer_spec.rb |  22 +++
	 spec/ruby/core/process/constants_spec.rb           |   1 +
	 spec/ruby/core/process/detach_spec.rb              |  29 +++
	 spec/ruby/core/process/spawn_spec.rb               |  10 +
	 spec/ruby/core/process/times_spec.rb               |   2 +-
	 spec/ruby/core/queue/initialize_spec.rb            |  13 +-
	 spec/ruby/core/refinement/import_methods_spec.rb   |  34 ++++
	 spec/ruby/core/refinement/include_spec.rb          |  27 +++
	 spec/ruby/core/refinement/prepend_spec.rb          |  27 +++
	 spec/ruby/core/regexp/initialize_spec.rb           |   2 +-
	 spec/ruby/core/signal/trap_spec.rb                 |  12 ++
	 spec/ruby/core/string/byteslice_spec.rb            |   6 +
	 spec/ruby/core/string/capitalize_spec.rb           |   4 +
	 spec/ruby/core/string/chars_spec.rb                |   7 +-
	 spec/ruby/core/string/chomp_spec.rb                |   4 +
	 spec/ruby/core/string/chop_spec.rb                 |   4 +
	 spec/ruby/core/string/clone_spec.rb                |   4 +
	 spec/ruby/core/string/delete_prefix_spec.rb        |   4 +
	 spec/ruby/core/string/delete_spec.rb               |   4 +
	 spec/ruby/core/string/delete_suffix_spec.rb        |   4 +
	 spec/ruby/core/string/downcase_spec.rb             |   4 +
	 spec/ruby/core/string/dump_spec.rb                 |  10 +-
	 spec/ruby/core/string/dup_spec.rb                  |   4 +
	 spec/ruby/core/string/lines_spec.rb                |   1 -
	 spec/ruby/core/string/reverse_spec.rb              |   4 +
	 spec/ruby/core/string/scan_spec.rb                 |   6 +
	 spec/ruby/core/string/scrub_spec.rb                |  10 +
	 spec/ruby/core/string/shared/each_line.rb          |   6 +
	 spec/ruby/core/string/shared/partition.rb          |  15 ++
	 spec/ruby/core/string/shared/slice.rb              |  13 +-
	 spec/ruby/core/string/shared/strip.rb              |   4 +
	 spec/ruby/core/string/shared/succ.rb               |   4 +
	 spec/ruby/core/string/split_spec.rb                |  17 +-
	 spec/ruby/core/string/squeeze_spec.rb              |   5 +
	 spec/ruby/core/string/swapcase_spec.rb             |   4 +
	 spec/ruby/core/string/undump_spec.rb               |   2 +-
	 spec/ruby/core/string/unpack/b_spec.rb             |  28 ++-
	 spec/ruby/core/string/unpack/c_spec.rb             |  14 +-
	 spec/ruby/core/string/unpack/h_spec.rb             |  28 ++-
	 spec/ruby/core/string/unpack/shared/basic.rb       |  28 ---
	 spec/ruby/core/string/unpack/shared/float.rb       |  60 +++++-
	 spec/ruby/core/string/unpack/shared/integer.rb     |  88 +++++++--
	 spec/ruby/core/string/unpack/shared/unicode.rb     |  14 +-
	 spec/ruby/core/string/unpack/w_spec.rb             |  14 +-
	 spec/ruby/core/string/unpack1_spec.rb              |  12 +-
	 spec/ruby/core/string/unpack_spec.rb               |  34 ++++
	 spec/ruby/core/string/upcase_spec.rb               |   4 +
	 spec/ruby/core/string/valid_encoding/utf_8_spec.rb | 214 +++++++++++++++++++++
	 spec/ruby/core/struct/values_at_spec.rb            |  55 +++++-
	 spec/ruby/core/symbol/shared/id2name.rb            |   7 +
	 spec/ruby/core/time/at_spec.rb                     |  16 ++
	 spec/ruby/core/time/localtime_spec.rb              |  16 +-
	 spec/ruby/core/time/new_spec.rb                    |  94 +++++++--
	 spec/ruby/core/time/shared/gmtime.rb               |   4 +-
	 spec/ruby/core/time/shared/time_params.rb          |  11 +-
	 spec/ruby/core/time/strftime_spec.rb               |  40 +++-
	 spec/ruby/core/time/utc_spec.rb                    |  41 +++-
	 spec/ruby/core/time/zone_spec.rb                   |  20 +-
	 spec/ruby/core/tracepoint/inspect_spec.rb          |   9 +
	 spec/ruby/fixtures/code/load_wrap_fixture.rb       |  12 ++
	 spec/ruby/fixtures/code/wrap_fixture.rb            |   9 -
	 spec/ruby/language/case_spec.rb                    |   4 +-
	 .../ruby/language/regexp/character_classes_spec.rb |   5 +
	 spec/ruby/library/coverage/running_spec.rb         |  20 ++
	 spec/ruby/library/date/civil_spec.rb               |   7 +-
	 spec/ruby/library/objectspace/fixtures/trace.rb    |   5 +
	 spec/ruby/library/objectspace/trace_spec.rb        |  15 ++
	 spec/ruby/library/openssl/x509/name/verify_spec.rb |   4 +-
	 spec/ruby/library/stringio/initialize_spec.rb      |  85 ++++++++
	 spec/ruby/library/stringio/new_spec.rb             |   8 +
	 spec/ruby/library/stringio/shared/write.rb         |  22 +++
	 spec/ruby/optional/capi/ext/io_spec.c              |  43 +++++
	 spec/ruby/optional/capi/io_spec.rb                 |  15 ++
	 spec/ruby/shared/rational/Rational.rb              |  48 ++---
	 114 files changed, 1963 insertions(+), 245 deletions(-)
	 create mode 100644 spec/ruby/core/marshal/fixtures/classes.rb
	 create mode 100644 spec/ruby/core/refinement/import_methods_spec.rb
	 create mode 100644 spec/ruby/core/refinement/include_spec.rb
	 create mode 100644 spec/ruby/core/refinement/prepend_spec.rb
	 create mode 100644 spec/ruby/core/string/unpack_spec.rb
	 create mode 100644 spec/ruby/core/string/valid_encoding/utf_8_spec.rb
	 create mode 100644 spec/ruby/fixtures/code/load_wrap_fixture.rb
	 delete mode 100644 spec/ruby/fixtures/code/wrap_fixture.rb
	 create mode 100644 spec/ruby/library/coverage/running_spec.rb
	 create mode 100644 spec/ruby/library/objectspace/fixtures/trace.rb
	 create mode 100644 spec/ruby/library/objectspace/trace_spec.rb
	 create mode 100644 spec/ruby/library/stringio/new_spec.rb

1 files changed, 18 insertions, 0 deletions

diff --git a/spec/ruby/core/array/shared/unshift.rb b/spec/ruby/core/array/shared/unshift.rb
index fc82e19e2a..4941e098f6 100644
--- a/spec/ruby/core/array/shared/unshift.rb
+++ b/spec/ruby/core/array/shared/unshift.rb
@@ -22,6 +22,11 @@ describe :array_unshift, shared: true do
     a.should == [3, 4]
   end
 
+  it "returns self" do
+    a = [1, 2, 3]
+    a.send(@method, "a").should.equal?(a)
+  end
+
   it "quietly ignores unshifting nothing" do
     [].send(@method).should == []
   end
@@ -43,4 +48,17 @@ describe :array_unshift, shared: true do
   it "raises a FrozenError on a frozen array when the array would not be modified" do
     -> { ArraySpecs.frozen_array.send(@method) }.should raise_error(FrozenError)
   end
+
+  # https://github.com/oracle/truffleruby/issues/2772
+  it "doesn't rely on Array#[]= so it can be overridden" do
+    subclass = Class.new(Array) do
+      def []=(*)
+        raise "[]= is called"
+      end
+    end
+
+    array = subclass.new
+    array.send(@method, 1)
+    array.should == [1]
+  end
 end