parse.y: bare kwrest_mark

* parse.y (f_kwrest): allow bare kwrest_mark as valid syntax.  its
  semantics is still undefined.  [Bug #7662] [ruby-core:51269]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@38725 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

3 files changed, 17 insertions, 0 deletions

diff --git a/ChangeLog b/ChangeLog
index aed7245394..67c2618d62 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Mon Jan  7 15:42:10 2013  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* parse.y (f_kwrest): allow bare kwrest_mark as valid syntax.  its
+	  semantics is still undefined.  [Bug #7662] [ruby-core:51269]
+
 Mon Jan  7 15:31:58 2013  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* parse.y (f_kwrest): reject duplicated kwrest argument name.
diff --git a/parse.y b/parse.y
index 56c9425a29..8a541a880d 100644
--- a/parse.y
+++ b/parse.y
@@ -4685,6 +4685,10 @@ f_kwrest	: kwrest_mark tIDENTIFIER
 			shadowing_lvar(get_id($2));
 			$$ = $2;
 		    }
+		| kwrest_mark
+		    {
+			$$ = internal_id();
+		    }
 		;
 
 f_opt		: tIDENTIFIER '=' arg_value
diff --git a/test/ruby/test_keyword.rb b/test/ruby/test_keyword.rb
index 8fe69b44fb..3685024991 100644
--- a/test/ruby/test_keyword.rb
+++ b/test/ruby/test_keyword.rb
@@ -1,4 +1,5 @@
 require 'test/unit'
+require_relative 'envutil'
 
 class TestKeywordArguments < Test::Unit::TestCase
   def f1(str: "foo", num: 424242)
@@ -266,4 +267,11 @@ class TestKeywordArguments < Test::Unit::TestCase
     assert_equal(expect, rest_keyrest(*expect), bug7665)
     assert_equal(expect, proc {|*args, **opt| next *args, opt}.call(*expect), bug7665)
   end
+
+  def test_bare_kwrest
+    # valid syntax, but its semantics is undefined
+    assert_valid_syntax("def bug7662(**) end")
+    assert_valid_syntax("def bug7662(*, **) end")
+    assert_valid_syntax("def bug7662(a, **) end")
+  end
 end