michael@0: for (var i = 0; i < 5; ++i) {
michael@0:     var o = {}
michael@0:     Object.defineProperty(o, 'x', { value:"cow", writable:false });
michael@0:     var r = o.watch('x', function() {});
michael@0:     assertEq(r, undefined);
michael@0:     o.x = 4;
michael@0: }