diff -r 000000000000 -r 6474c204b198 js/src/tests/js1_5/extensions/regress-406572.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/tests/js1_5/extensions/regress-406572.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,45 @@
+/* -*- 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 = 406572;
+var summary = 'JSOP_CLOSURE unconditionally replaces properties of the variable object - Browser only';
+var actual = '';
+var expect = '';
+
+printBugNumber(BUGNUMBER);
+printStatus (summary);
+
+if (typeof window != 'undefined')
+{
+  try {
+    actual = "FAIL: Unexpected exception thrown";
+
+    var win = window;
+    var windowString = String(window);
+    window = 1;
+    reportCompare(windowString, String(window), "window should be readonly");
+
+    actual = ""; // We should reach this line, and throw an exception after it
+
+    if (1)
+      function window() { return 1; }
+
+    actual = "FAIL: this line should never be reached";
+
+    // The test harness might rely on window having its original value:
+    // restore it.
+    window = win;
+  } catch (e) {
+  }
+}
+else
+{
+  expect = actual = 'Test can only run in a Gecko 1.9 browser or later.';
+  print(actual);
+}
+reportCompare(expect, actual, summary);
+
+