diff -r 000000000000 -r 6474c204b198 js/src/tests/js1_5/extensions/regress-354541-01.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/tests/js1_5/extensions/regress-354541-01.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,34 @@
+/* -*- 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 = 354541;
+var summary = 'Regression to standard class constructors in case labels';
+var actual = '';
+var expect = '';
+
+
+printBugNumber(BUGNUMBER);
+printStatus (summary + ': top level');
+
+String.prototype.trim = function() { print('hallo'); };
+
+const S = String;
+const Sp = String.prototype;
+
+expect = 'No Error';
+actual = 'No Error';
+
+if (typeof Script == 'undefined')
+{
+  print('Test skipped. Script not defined.');
+}
+else
+{
+  var s = Script('var tmp = function(o) { switch(o) { case String: case 1: return ""; } }; print(String === S); print(String.prototype === Sp); "".trim();');
+  s();
+}
+ 
+reportCompare(expect, actual, summary);