From 0cd34e96396c0e552f323b2c908419cf158830ca Mon Sep 17 00:00:00 2001
From: nobu <nobu@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Wed, 24 Feb 2016 02:38:43 +0000
Subject: [PATCH] vm_method.c: for hidden object

* vm_method.c (rb_method_basic_definition_p): methods of hidden
  objects cannot be overridden, return TRUE.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@53911 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 vm_method.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/vm_method.c b/vm_method.c
index 66c783ce2a..e3c365dd42 100644
--- a/vm_method.c
+++ b/vm_method.c
@@ -1859,7 +1859,9 @@ rb_mod_modfunc(int argc, VALUE *argv, VALUE module)
 int
 rb_method_basic_definition_p(VALUE klass, ID id)
 {
-    const rb_method_entry_t *me = rb_method_entry(klass, id);
+    const rb_method_entry_t *me;
+    if (!klass) return TRUE; /* hidden object cannot be overridden */
+    me = rb_method_entry(klass, id);
     return (me && METHOD_ENTRY_BASIC(me)) ? TRUE : FALSE;
 }