The Tor Browser / file revision

 actual = '';

 expected = 'bundefined,aundefined,b[object Object],aundefined,bundefined,aundefined,b[object Object],aundefined,bundefined,aundefined,b[object Object],aundefined,bundefined,aundefined,b[object Object],aundefined,bundefined,aundefined,b[object Object],aundefined,bundefined,aundefined,b[object Object],aundefined,bundefined,aundefined,b[object Object],aundefined,bundefined,aundefined,b[object Object],aundefined,bundefined,aundefined,b[object Object],aundefined,bundefined,aundefined,b[object Object],aundefined,';

 // tests nfixed case of getting slot with let.

 for (var q = 0; q < 10; ++q) {

   for each(let b in [(void 0), {}]) {

         appendToActual('a' + ((function() {

             for (var e in ['']) {

                 appendToActual('b' + b)

             }

         })()))

     }

 }

 assertEq(actual, expected)