merge revision(s) 57360: [Backport #12884]

	class.c: non-keyword hash class

	* class.c (rb_extract_keywords): keep the class of non-keyword
	  elements hash as the original.  [ruby-core:77813] [Bug #12884]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_4@57861 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 12 insertions, 0 deletions

diff --git a/test/ruby/test_keyword.rb b/test/ruby/test_keyword.rb
index ad0bf63492..f10412e6cd 100644
--- a/test/ruby/test_keyword.rb
+++ b/test/ruby/test_keyword.rb
@@ -629,4 +629,16 @@ class TestKeywordArguments < Test::Unit::TestCase
       klass.new(d: 4)
     end
   end
+
+  def test_non_keyword_hash_subclass
+    bug12884 = '[ruby-core:77813] [Bug #12884]'
+    klass = EnvUtil.labeled_class("Child", Hash)
+    obj = Object.new
+    def obj.t(params = klass.new, d: nil); params; end
+    x = klass.new
+    x["foo"] = "bar"
+    result = obj.t(x)
+    assert_equal(x, result)
+    assert_kind_of(klass, result, bug12884)
+  end
 end