michael@0: // This was the actual bug
michael@0: assertRaises(StopIteration, function() {
michael@0:     Iterator.prototype.next();
michael@0:     Iterator.prototype.next();
michael@0: });
michael@0: 
michael@0: // The error should have triggered here, but was masked by a latent bug
michael@0: assertRaises(StopIteration, function() {
michael@0:     Iterator.prototype.next();
michael@0: });
michael@0: 
michael@0: // Found by fuzzing
michael@0: assertRaises(StopIteration, function() {
michael@0:     (new Iterator({})).__proto__.next();
michael@0: });
michael@0: 
michael@0: 
michael@0: function assertRaises(exc, callback) {
michael@0:     var caught = false;
michael@0:     try {
michael@0:         callback();
michael@0:     } catch (e) {
michael@0:         assertEq(e instanceof StopIteration, true);
michael@0:         caught = true;
michael@0:     }
michael@0:     assertEq(caught, true);
michael@0: }