diff -r 000000000000 -r 6474c204b198 js/src/tests/js1_5/extensions/regress-333541.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/tests/js1_5/extensions/regress-333541.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,57 @@
+/* -*- 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 = 333541;
+var summary = '1..toSource()';
+var actual = '';
+var expect = '';
+
+printBugNumber(BUGNUMBER);
+printStatus (summary);
+ 
+function a(){
+  return 1..toSource();
+}
+
+try
+{
+  expect = 'function a() {\n    return 1..toSource();\n}';
+  actual = a.toString();
+  compareSource(expect, actual, summary + ': 1');
+}
+catch(ex)
+{
+  actual = ex + '';
+  reportCompare(expect, actual, summary + ': 1');
+}
+
+try
+{
+  expect = 'function a() {return 1..toSource();}';
+  actual = a.toSource();
+  compareSource(expect, actual, summary + ': 2');
+}
+catch(ex)
+{
+  actual = ex + '';
+  reportCompare(expect, actual, summary + ': 2');
+}
+
+expect = a;
+actual = a.valueOf();
+reportCompare(expect, actual, summary + ': 3');
+
+try
+{
+  expect = 'function a() {\n    return 1..toSource();\n}';
+  actual = "" + a;
+  compareSource(expect, actual, summary + ': 4');
+}
+catch(ex)
+{
+  actual = ex + '';
+  reportCompare(expect, actual, summary + ': 4');
+}