compile.c: unnamed keyword rest check

* compile.c (iseq_set_arguments): set arg_keyword_check from
  nd_cflag, which is set by parser.  internal ID is used for
  unnamed keyword rest argument, which should be separated from no
  keyword check.
* iseq.c (rb_iseq_parameters): if no keyword check, keyword rest is
  present.
* parse.y (new_args_tail_gen): set keywords check to nd_cflag, which
  equals to that keyword rest is not present.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@44420 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 9 insertions, 0 deletions

diff --git a/test/ruby/test_keyword.rb b/test/ruby/test_keyword.rb
index d636d75a92..625146b0ba 100644
--- a/test/ruby/test_keyword.rb
+++ b/test/ruby/test_keyword.rb
@@ -117,6 +117,15 @@ class TestKeywordArguments < Test::Unit::TestCase
     assert_equal([1, 2, [3, 4], 5, :key, {str: "bar"}, nil], f9(1, 2, 3, 4, 5, str: "bar"))
   end
 
+  def f10(a: 1, **)
+    a
+  end
+
+  def test_f10
+    assert_equal(42, f10(a: 42))
+    assert_equal(1, f10(b: 42))
+  end
+
   def test_method_parameters
     assert_equal([[:key, :str], [:key, :num]], method(:f1).parameters);
     assert_equal([[:req, :x], [:key, :str], [:key, :num]], method(:f2).parameters);