diff -r 000000000000 -r 6474c204b198 js/src/tests/js1_5/extensions/regress-479487.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/tests/js1_5/extensions/regress-479487.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,46 @@
+/* -*- 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 = 479487;
+var summary = 'js_Array_dense_setelem can call arbitrary JS code';
+var actual = '';
+var expect = '';
+
+
+//-----------------------------------------------------------------------------
+test();
+//-----------------------------------------------------------------------------
+
+function test()
+{
+  enterFunc ('test');
+  printBugNumber(BUGNUMBER);
+  printStatus (summary);
+
+  jit(true);
+
+  Array.prototype[1] = 2;
+
+  Array.prototype.__defineSetter__(32, function() { print("Hello from arbitrary JS");});
+  Array.prototype.__defineGetter__(32, function() { return 11; });
+
+  function f()
+  {
+    var a = [];
+    for (var i = 0; i != 10; ++i) {
+      a[1 << i] = 9999;
+    }
+    return a;
+  }
+
+  f();
+
+  jit(false);
+
+  reportCompare(expect, actual, summary);
+
+  exitFunc ('test');
+}