michael@0: var msg = "";
michael@0: try {
michael@0:     this.__defineSetter__('x', Object.create);
michael@0:     this.watch('x', function() {});
michael@0:     x = 3;
michael@0: } catch (e) {
michael@0:     msg = e.toString();
michael@0: }
michael@0: assertEq(msg, "TypeError: undefined is not an object or null");