The Tor Browser / file revision

 // Any copyright is dedicated to the Public Domain.

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

 // Contributor: Jim Blandy

 if (typeof findReferences == "function") {

     function makeGenerator(c) { eval(c); yield function generatorClosure() { return x; }; }

     var generator = makeGenerator('var x = 42');

     var closure = generator.next();

     referencesVia(closure, 'parent; generator object', generator);

     var o = {};

     assertEq(function f() {

 	return referencesVia(null, 'arguments', arguments) ||

 	       referencesVia(null, 'baseline-args-obj', arguments);

     }(), true);

     var rvalueCorrect;

     function finallyHoldsRval() {

         try {

             return o;

         } finally {

             rvalueCorrect = referencesVia(null, 'rval', o) ||

                             referencesVia(null, 'baseline-rval', o);

         }

     }

     rvalueCorrect = false;

     finallyHoldsRval();

     assertEq(rvalueCorrect, true);

     // Because we don't distinguish between JavaScript stack marking and C++

     // stack marking (both use the conservative scanner), we can't really write

     // the following tests meaningfully:

     //   generator frame -> generator object

     //   stack frame -> local variables

     //   stack frame -> this

     //   stack frame -> callee

     //   for(... in x) loop's reference to x

     reportCompare(true, true);

 } else {

     reportCompare(true, true, "test skipped: findReferences is not a function");

 }