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

1 files changed, 4 insertions, 0 deletions

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