diff -r 000000000000 -r 6474c204b198 js/src/tests/js1_5/Regress/regress-476049.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/tests/js1_5/Regress/regress-476049.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,43 @@
+/* -*- 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 = 476049;
+var summary = 'JSOP_DEFVAR enables gvar optimization for non-permanent properties';
+var actual = '';
+var expect = '';
+
+printBugNumber(BUGNUMBER);
+printStatus (summary);
+
+// This test requires either two input files in the shell or two 
+// script blocks in the browser. 
+
+if (typeof window == 'undefined')
+{
+  print(expect = actual = 'Test skipped');
+}
+else
+{
+  document.write(
+    '<script type="text/javascript">' +
+    'for (var i = 0; i != 1000; ++i)' + 
+    '  this["a"+i] = 0;' + 
+    'eval("var x");' + 
+    'for (var i = 0; i != 1000; ++i)' + 
+    '  delete this["a"+i];' + 
+    '<\/script>'
+    );
+
+  document.write(
+    '<script type="text/javascript">' +
+    'var x;' + 
+    'eval("delete x;");' +
+    'x={};' +
+    '<\/script>'
+    );
+}
+
+reportCompare(expect, actual, summary);