diff -r 000000000000 -r 6474c204b198 js/src/tests/js1_5/extensions/regress-164697.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/tests/js1_5/extensions/regress-164697.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,80 @@
+/* -*- 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 = 164697;
+var summary = '(parent(instance) == parent(constructor))';
+var actual = '';
+var expect = '';
+
+printBugNumber(BUGNUMBER);
+printStatus (summary);
+
+expect = 'true';
+
+runtest('{}', 'Object');
+runtest('new Object()', 'Object');
+
+// see https://bugzilla.mozilla.org/show_bug.cgi?id=321669
+// for why this test is not contained in a function.
+actual = (function (){}).__proto__ == Function.prototype;
+reportCompare('true', actual+'',
+              '(function (){}).__proto__ == Function.prototype');
+
+runtest('new Function(";")', 'Function');
+
+runtest('[]', 'Array');
+runtest('new Array()', 'Array');
+
+runtest('new String()', 'String');
+
+runtest('new Boolean()', 'Boolean');
+
+runtest('new Number("1")', 'Number');
+
+runtest('new Date()', 'Date');
+
+runtest('/x/', 'RegExp');
+runtest('new RegExp("x")', 'RegExp');
+
+runtest('new Error()', 'Error');
+
+function runtest(myinstance, myconstructor)
+{
+  var expr;
+  var actual;
+
+  if (typeof parent === "function")
+  {
+    try
+    {
+      expr =
+        'parent(' + myinstance + ') == ' +
+        'parent(' + myconstructor + ')';
+      printStatus(expr);
+      actual = eval(expr).toString();
+    }
+    catch(ex)
+    {
+      actual = ex + '';
+    }
+
+    reportCompare(expect, actual, expr);
+  }
+
+  try
+  {
+    expr =  '(' + myinstance + ').__proto__ == ' +
+      myconstructor + '.prototype';
+    printStatus(expr);
+    actual = eval(expr).toString();
+  }
+  catch(ex)
+  {
+    actual = ex + '';
+  }
+
+  reportCompare(expect, actual, expr);
+}