The Tor Browser / file revision

 // Any copyright is dedicated to the Public Domain.

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

 // Don't assert trying to parse any of these.

 var a = ["({''})",

          "({''} = {})",

          "var {''};",

          "var {'', a} = {a: 0};",

          "var {'bad'};",

          "({'bad'} = {bad: 0});",

          "var {'if'};",

          "function f({''}) {}",

          "function f({a, 'bad', c}) {}"];

 var x;

 for (var i = 0; i < a.length; i++) {

     x = undefined;

     try {

         eval(a[i]);

     } catch (exc) {

         x = exc;

     }

     assertEq(x instanceof SyntaxError, true);

 }

 assertEq("" in this, false);

 assertEq("bad" in this, false);

 assertEq("if" in this, false);

 reportCompare(0, 0, 'ok');