michael@0: // assignment to watched global properties 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: var x = 0;
michael@0: var y = 0;
michael@0: function f() {
michael@0:     var a = [{}, this];
michael@0:     for (var i = 0; i < 14; i++) {
michael@0:         print(shapeOf(this));
michael@0:         Object.prototype.watch.call(a[+(i > 8)], "y", counter);
michael@0:         y++;
michael@0:     }
michael@0: }
michael@0: f();
michael@0: assertEq(hits, 5);
michael@0: