The Tor Browser / file revision

 // Don't assert with --ion-eager.

 function RandBool() { var x = Math.random() >= 0.5; return x; }

 var CHARS = "aaa";

 function RandStr() {

   var c = Math.floor(Math.random() * CHARS.length);

 }

 function RandVal() { 

   return RandBool() ? RandStr() : RandStr(); 

 }

 function GenerateSpecPermutes(matchVals, resultArray) {

     var maxPermuteBody = (1 << matchVals.length) - 1;

     for(var bod_pm = 0; bod_pm <= maxPermuteBody; bod_pm++)

       for(var k = 0; k < matchVals.length; k++)

         var body = ((bod_pm & (1 << k)) > 0) ? null : RandVal();

 }

 GenerateSpecPermutes(["foo", "bar", "zing"]);