michael@0: var p = new Promise(function(resolve, reject) {
michael@0:   // This causes a runnable to be queued.
michael@0:   reject(new Error());
michael@0:   postMessage("loaded");
michael@0: 
michael@0:   // This prevents that runnable from running until the window calls terminate(),
michael@0:   // at which point the worker goes into the Canceling state and then an
michael@0:   // AddFeature() is attempted, which fails, which used to result in multiple
michael@0:   // calls to the error reporter, one after the worker's context had been GCed.
michael@0:   while (true);
michael@0: });