From 86d46b5459cda15a616e29934b1ddfe4ec788735 Mon Sep 17 00:00:00 2001
From: shugo <shugo@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Tue, 17 Nov 2009 14:53:32 +0000
Subject: * vm_method.c (rb_alias): should raise TypeError if klass is nil.  
 1.instance_eval { alias to_string to_s } causes SEGV before this   fix. *
 test/ruby/test_alias.rb (test_special_const_alias): ditto.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@25826 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 vm_method.c | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'vm_method.c')

diff --git a/vm_method.c b/vm_method.c
index 557583f5aa..d1c68b58f3 100644
--- a/vm_method.c
+++ b/vm_method.c
@@ -857,6 +857,10 @@ rb_alias(VALUE klass, ID name, ID def)
 {
     rb_method_entry_t *orig_me;
 
+    if (NIL_P(klass)) {
+	rb_raise(rb_eTypeError, "no class to make alias");
+    }
+
     rb_frozen_class_p(klass);
     if (klass == rb_cObject) {
 	rb_secure(4);
-- 
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