michael@0: // assignments to watched properties via ++ must not be traced
michael@0: var hits = 0;
michael@0: function counter(id, oldval, newval) {
michael@0:     hits++;
michael@0:     return newval;
michael@0: }
michael@0: 
michael@0: (function () {
michael@0:     var obj = {x: 0, y: 0};
michael@0:     var a = ['x', 'y'];
michael@0:     obj.watch('z', counter);
michael@0:     for (var i = 0; i < 14; i++) {
michael@0:         obj.watch(a[+(i > 8)], counter);
michael@0:         obj.y++;
michael@0:     }
michael@0: })();
michael@0: assertEq(hits, 5);
michael@0: