The Tor Browser / file revision

 /*

  * Any copyright is dedicated to the Public Domain.

  * http://creativecommons.org/licenses/publicdomain/

  */

 //-----------------------------------------------------------------------------

 var BUGNUMBER = 614070;

 var summary = 'Array.prototype.unshift without args';

 print(BUGNUMBER + ": " + summary);

 /**************

  * BEGIN TEST *

  **************/

 var a = {};

 a.length = 4294967296;

 assertEq([].unshift.call(a), 0);

 assertEq(a.length, 0);

 function testGetSet(len, expected) {

     var newlen;

     var a = { get length() { return len; }, set length(v) { newlen = v; } };

     var res = [].unshift.call(a);

     assertEq(res, expected);

     assertEq(newlen, expected);

 }

 testGetSet(0, 0);

 testGetSet(10, 10);

 testGetSet("1", 1);

 testGetSet(null, 0);

 testGetSet(4294967297, 1);

 testGetSet(-5, 4294967291);

 /******************************************************************************/

 if (typeof reportCompare === "function")

   reportCompare(true, true);

 print("All tests passed!");