michael@0: 
michael@0: function s(f) { this._m = f; }
michael@0: function C() {
michael@0:     Object.defineProperty(this, "m", {set: s});
michael@0:     this.m = function () {};
michael@0: }
michael@0: var last = {};
michael@0: for (var i = 0; i < 20; i++) {
michael@0:   var a = new C;
michael@0:   assertEq(a._m === last._m, false);
michael@0:   last = a;
michael@0: }