The Tor Browser / file revision

 // Array.prototype.iterator applied to undefined or null throws directly.

 load(libdir + "asserts.js");

 load(libdir + "iteration.js");

 for (var v of [undefined, null]) {

     // ES6 draft 2013-09-05 section 22.1.5.1.

     assertThrowsInstanceOf(function () { Array.prototype[std_iterator].call(v); }, TypeError);

     assertThrowsInstanceOf(function () { Array.prototype.keys.call(v); }, TypeError);

     assertThrowsInstanceOf(function () { Array.prototype.entries.call(v); }, TypeError);

 }