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/. */

 var std_iterator = (function() {

     try {

         for (var _ of new Proxy({}, { get: function(_, name) { throw name; } }))

             break;

     } catch (name) {

         return name;

     }

     throw 'wat';

 })();

 function assertFalse(a) { assertEq(a, false) }

 function assertTrue(a) { assertEq(a, true) }

 function assertNotEq(found, not_expected) { assertFalse(found === expected) }

 function assertIteratorResult(result, value, done) {

     assertDeepEq(result.value, value);

     assertEq(result.done, done);

 }

 function assertIteratorNext(iter, value) {

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

 }

 function assertIteratorDone(iter, value) {

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

 }