diff -r 000000000000 -r 6474c204b198 js/src/tests/js1_5/GC/regress-316885-01.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/tests/js1_5/GC/regress-316885-01.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,33 @@
+/* -*- 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 = 316885;
+var summary = 'Unrooted access in jsinterp.c';
+var actual = '';
+var expect = '';
+
+printBugNumber(BUGNUMBER);
+printStatus (summary);
+
+var str_with_num = "0.1";
+
+var obj = {
+  get elem() {
+    return str_with_num;
+  },
+  set elem(value) {
+    gc();
+  }
+
+};
+
+expect = Number(str_with_num);
+actual = obj.elem++;
+
+gc();
+
+ 
+reportCompare(expect, actual, summary);