vm_args.c: fix non-symbol keys hash

* vm_args.c (keyword_hash_p): fix non-symbol keys hash.
  rb_extract_keywords() returns 0 not Qnil when no symbol keys is
  included.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@49088 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 7 insertions, 0 deletions

diff --git a/test/ruby/test_keyword.rb b/test/ruby/test_keyword.rb
index 82d6407fe3..70cdba1db2 100644
--- a/test/ruby/test_keyword.rb
+++ b/test/ruby/test_keyword.rb
@@ -559,4 +559,11 @@ class TestKeywordArguments < Test::Unit::TestCase
       assert_equal({:bar => "bar"}, obj.foo, bug10659)
     }
   end
+
+  def m(a) yield a end
+
+  def test_nonsymbol_key
+    result = m(["a" => 10]) { |a = nil, **b| [a, b] }
+    assert_equal([{"a" => 10}, {}], result)
+  end
 end