michael@0: function Foo() {
michael@0:     for (var i=0; i<10; i++) {
michael@0:         this["p" + i] = i;
michael@0:     }
michael@0: }
michael@0: 
michael@0: function test1(foo) {
michael@0:     for (var i=0; i<10400; i++) {
michael@0:         foo.p1 = i;
michael@0:         foo.p9 = i;
michael@0:         var x = foo.p0 + foo.p1 + foo.p2 + foo.p8 + foo.p4 +
michael@0:             foo.p5 + foo.p6 + foo.p7 + foo.p3 + foo.p9;
michael@0:         assertEq(x, i + i + 35);
michael@0:     }
michael@0: }
michael@0: 
michael@0: test1(new Foo);
michael@0: 
michael@0: function Bar(arg) {
michael@0:     if (arg) { // Thwart definite-property analysis.
michael@0:         this.x = 1;
michael@0:         this.y = 2;
michael@0:         this.z = 3;
michael@0:     }
michael@0: }
michael@0: 
michael@0: function test2(bar) {
michael@0:     for (var i=0; i<10400; i++) {
michael@0:         bar.x++;
michael@0:         bar.y++;
michael@0:         bar.z++;
michael@0:     }
michael@0:     assertEq(bar.x, 10401);
michael@0:     assertEq(bar.y, 10402);
michael@0:     assertEq(bar.z, 10403);
michael@0: }
michael@0: 
michael@0: test2(new Bar(true));