The Tor Browser / file revision

 // Basic tests for Debugger.Object.prototype.class.

 var g = newGlobal();

 var dbg = new Debugger(g);

 var hits = 0;

 g.eval('function f() { debugger; }');

 dbg.onDebuggerStatement = function (frame) {

     var arr = frame.arguments;

     assertEq(arr[0].class, "Object");

     assertEq(arr[1].class, "Array");

     assertEq(arr[2].class, "Function");

     assertEq(arr[3].class, "Date");

     assertEq(arr[4].class, "Object");

     assertEq(arr[5].class, "Function");

     assertEq(arr[6].class, "Date");

     hits++;

 };

 g.f(Object.prototype, [], eval, new Date,

     Proxy.create({}), Proxy.createFunction({}, eval), new Proxy(new Date, {}));

 assertEq(hits, 1);

 // Debugger.Object.prototype.class should see through cross-compartment

 // wrappers.

 g.eval('f(Object.prototype, [], eval, new Date,\

           Proxy.create({}), Proxy.createFunction({}, f), new Proxy(new Date, {}));');

 assertEq(hits, 2);