diff -r 000000000000 -r 6474c204b198 js/src/tests/js1_5/extensions/regress-462734-04.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/tests/js1_5/extensions/regress-462734-04.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,32 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+//-----------------------------------------------------------------------------
+var BUGNUMBER = 462734;
+var summary = 'Do not assert: pobj_ == obj2';
+var actual = '';
+var expect = '';
+
+printBugNumber(BUGNUMBER);
+printStatus (summary);
+
+var save__proto__ = __proto__;
+
+try
+{
+  Function.prototype.prototype = function() { return 42; }
+  __proto__ = Function();
+  prototype = prototype;
+}
+catch(ex)
+{
+}
+
+expect = 'object';
+actual = typeof prototype;
+
+__proto__ = save__proto__;
+
+reportCompare(expect, actual, summary);