From a9e712b1b495f5d19b98ef23940c6be20c6f8581 Mon Sep 17 00:00:00 2001
From: Brandon Mitchell <brandon@twitter.com>
Date: Tue, 31 May 2011 16:24:55 -0700
Subject: [PATCH] Make class and module objects unfreezeable to prevent future
 extension of these objects from resulting in TypeErrors.

---
 object.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/object.c b/object.c
index f658560fd..b389958f2 100644
--- a/object.c
+++ b/object.c
@@ -252,7 +252,7 @@ rb_obj_freeze(VALUE obj)
             break;
         }
     }
-    if (!OBJ_FROZEN(obj)) {
+    if (!OBJ_FROZEN(obj) && TYPE(obj) != T_CLASS && TYPE(obj) != T_MODULE) {
         if (rb_safe_level() >= 4 && !OBJ_TAINTED(obj)) {
             rb_raise(rb_eSecurityError, "Insecure: can't freeze object");
         }