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diff --git a/js/src/tests/js1_5/extensions/regress-341956-01.js b/js/src/tests/js1_5/extensions/regress-341956-01.js
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+/* -*- tab-width: 2; indent-tabs-mode: nil; js-indent-level: 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 = 341956;
+var summary = 'GC Hazards in jsarray.c - unshift';
+var actual = 'No Crash';
+var expect = 'No Crash';
+
+//-----------------------------------------------------------------------------
+test();
+//-----------------------------------------------------------------------------
+
+function test()
+{
+ enterFunc ('test');
+ printBugNumber(BUGNUMBER);
+ printStatus (summary);
+
+ var N = 0xFFFFFFFF;
+
+ var a = [];
+ a[N - 1] = 1;
+ a.__defineGetter__(N - 1, function() {
+ var tmp = [];
+ tmp[N - 2] = 0;
+ if (typeof gc == 'function')
+ gc();
+ for (var i = 0; i != 50000; ++i) {
+ var tmp = 1 / 3;
+ tmp /= 10;
+ }
+ for (var i = 0; i != 1000; ++i) {
+ // Make string with 11 characters that would take
+ // (11 + 1) * 2 bytes or sizeof(JSAtom) so eventually
+ // malloc will ovewrite just freed atoms.
+ var tmp2 = Array(12).join(' ');
+ }
+ return 10;
+ });
+
+
+// The following always-throw getter is to stop unshift from doing
+// 2^32 iterations.
+ var toStop = "stringToStop";
+ a[N - 3] = 0;
+ a.__defineGetter__(N - 3, function() { throw toStop; });
+
+ var good = false;
+
+ try {
+ a.unshift(1);
+ } catch (e) {
+ if (e === toStop)
+ good = true;
+ }
+
+ expect = true;
+ actual = good;
+
+ reportCompare(expect, actual, summary);
+
+ print('Done');
+
+ exitFunc ('test');
+}