michael@0: // Make sure new script properties can be invalidated on specialized prototype
michael@0: // types while they are still being constructed.
michael@0: 
michael@0: function Foo(a, b, c) {
michael@0:   this.x = a + b;
michael@0:   this.y = c;
michael@0: }
michael@0: 
michael@0: updated = false;
michael@0: var o = {valueOf: function() {
michael@0:     Object.defineProperty(Object.prototype, 'y', {set:function() { updated = true; }})
michael@0:   }};
michael@0: 
michael@0: function Bar() {}
michael@0: Bar.prototype = new Foo(o, 1, 2);
michael@0: assertEq(updated, true);
michael@0: assertEq(Bar.prototype.y, undefined);