* parse.y (f_rest_arg): check if duplicated. [ruby-core:14140]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_8@14313 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 2 insertions, 0 deletions

diff --git a/parse.y b/parse.y
index 414c775fd1..e93148ff9e 100644
--- a/parse.y
+++ b/parse.y
@@ -2339,6 +2339,8 @@ f_rest_arg	: restarg_mark tIDENTIFIER
 		    {
 			if (!is_local_id($2))
 			    yyerror("rest argument must be local variable");
+			else if (local_id($2))
+			    yyerror("duplicate rest argument name");
 			if (dyna_in_block()) {
 			    rb_dvar_push($2, Qnil);
 			}