The Tor Browser / file revision

 /* 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/. */

 // Library file for tests to load.

 function Range(start, stop) {

     this.i = start;

     this.stop = stop;

 }

 Range.prototype = {

     __iterator__: function() this,

     next: function() {

         if (this.i >= this.stop)

             throw StopIteration;

         return this.i++;

     }

 };

 function range(start, stop) {

     return new Range(start, stop);

 }