The Tor Browser / file revision

 /*

  * Any copyright is dedicated to the Public Domain.

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

  */

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

 var BUGNUMBER = 987243;

 var summary = "Don't use .call(...) in the self-hosted Map.prototype.forEach";

 print(BUGNUMBER + ": " + summary);

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

  * BEGIN TEST *

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

 var functionCall = Function.prototype.call;

 function throwSyntaxError()

 {

   throw new SyntaxError("Function.prototype.call incorrectly called");

 }

 function lalala() {}

 Function.prototype.call = throwSyntaxError;

 new Map().forEach(throwSyntaxError);

 new Map([[1, 2]]).forEach(lalala);

 new Map([[1, 2], [3, 4]]).forEach(lalala);

 Function.prototype.call = function() { this.set(42, "fnord"); };

 new Map().forEach(throwSyntaxError);

 new Map([[1, 2]]).forEach(lalala);

 new Map([[1, 2], [3, 4]]).forEach(lalala);

 var callCount = 0;

 Function.prototype.call = function() { callCount++; };

 new Map().forEach(throwSyntaxError);

 new Map([[1, 2]]).forEach(lalala);

 new Map([[1, 2], [3, 4]]).forEach(lalala);

 assertEq(callCount, 0);

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

 if (typeof reportCompare === "function")

   reportCompare(true, true);

 print("Tests complete");