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/. */

 load(libdir + "asserts.js");

 // FIXME: Import from std::iteration.

 const std_iterator = '@@iterator';

 if (typeof assertIteratorResult === 'undefined') {

     var assertIteratorResult = function assertIteratorResult(result, value, done) {

         assertEq(typeof result, "object");

         var expectedProps = ['done', 'value'];

         var actualProps = Object.getOwnPropertyNames(result);

         actualProps.sort(), expectedProps.sort();

         assertDeepEq(actualProps, expectedProps);

         assertDeepEq(result.value, value);

         assertDeepEq(result.done, done);

     }

 }

 if (typeof assertIteratorNext === 'undefined') {

     var assertIteratorNext = function assertIteratorNext(iter, value) {

         assertIteratorResult(iter.next(), value, false);

     }

 }

 if (typeof assertIteratorDone === 'undefined') {

     var assertIteratorDone = function assertIteratorDone(iter, value) {

         assertIteratorResult(iter.next(), value, true);

     }

 }