The Tor Browser / file revision

 /*

  * Any copyright is dedicated to the Public Domain.

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

  */

 function checkConstruct(thing, buggy) {

     try {

         new thing();

         assertEq(0, 1, "not reached " + thing);

     } catch (e) {

         if (buggy)

             assertEq(String(e.message).indexOf("is not a constructor") === -1, false);

         else

             assertEq(String(e.message).indexOf("thing is not a constructor") === -1, false);

     }

 }

 var re = /aaa/

 checkConstruct(re, false);

 var boundFunctionPrototype = Function.prototype.bind();

 checkConstruct(boundFunctionPrototype, true);

 var boundBuiltin = Math.sin.bind();

 checkConstruct(boundBuiltin, true);

 /* We set the proxies construct trap to undefined,

  * so the call trap is used as constructor.

  */

 var proxiedFunctionPrototype = Proxy.create({}, Function.prototype, undefined);

 checkConstruct(proxiedFunctionPrototype, false);

 var proxiedBuiltin = Proxy.create({}, parseInt, undefined);

 checkConstruct(proxiedBuiltin, false);

 if (typeof reportCompare == 'function')

     reportCompare(0, 0, "ok");