2 files changed, 6 insertions, 0 deletions
diff --git a/ChangeLog b/ChangeLog
index bc6f6a6404..54555a7bf9 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Wed Dec 19 12:01:42 2007  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* parse.y (f_rest_arg): check if duplicated.  [ruby-core:14140]
+
 Wed Dec 19 10:52:29 2007  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* bignum.c (rb_cstr_to_inum): an underscore succeeding after octal
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);
 			}