merges r20770 from trunk into ruby_1_9_1.

* parse.y (block_call): block should not be given to yield.
  [ruby-core:20583]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_9_1@20823 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 6 insertions, 1 deletions

diff --git a/parse.y b/parse.y
index 189bcedfdc..92dd38fc48 100644
--- a/parse.y
+++ b/parse.y
@@ -3497,7 +3497,12 @@ do_block	: keyword_do_block
 block_call	: command do_block
 		    {
 		    /*%%%*/
-			block_dup_check($1->nd_args, $2);
+			if (nd_type($1) == NODE_YIELD) {
+			    compile_error(PARSER_ARG "block given to yield");
+			}
+			else {
+			    block_dup_check($1->nd_args, $2);
+			}    
 			$2->nd_iter = $1;
 			$$ = $2;
 			fixpos($$, $1);