* vm_eval.c (eval_string_with_cref): fix WB miss.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@41536 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,7 @@
+Fri Jun 21 20:32:13 2013  Koichi Sasada  <ko1@atdot.net>
+
+	* vm_eval.c (eval_string_with_cref): fix WB miss.
+
 Fri Jun 21 20:15:49 2013  Koichi Sasada  <ko1@atdot.net>
 
 	* include/ruby/ruby.h: support write barrier protection for T_STRUCT.

vm_eval.c

@@ -1283,7 +1283,7 @@ eval_string_with_cref(VALUE self, VALUE src, VALUE scope, NODE *cref, const char
 			    rb_str_update(mesg, 0, 0, RARRAY_AREF(errat, 0));
 			}
 		    }
-		    RARRAY_AREF(errat, 0) = RARRAY_AREF(bt2, 0);
+		    RARRAY_ASET(errat, 0, RARRAY_AREF(bt2, 0));
 		}
 	    }
 	    rb_exc_raise(errinfo);