michael@0: 
michael@0: var global = 0;
michael@0: 
michael@0: Object.defineProperty(Object.prototype, 0, {set: function() { global++; }});
michael@0: 
michael@0: for (var x = 0; x < 20; ++x)
michael@0:   [1,2];
michael@0: assertEq(global, 0);
michael@0: 
michael@0: Object.defineProperty(Object.prototype, 1, {set: function() { global++; }});
michael@0: 
michael@0: for (var x = 0; x < 20; ++x)
michael@0:   [1,2];
michael@0: assertEq(global, 0);
michael@0: 
michael@0: Object.defineProperty(Object.prototype, "b", {set: function() { global++; }});
michael@0: 
michael@0: for (var x = 0; x < 20; ++x) {
michael@0:   var s = { a:0, b:1, 0: 2, 1: 3 };
michael@0: }
michael@0: assertEq(global, 0);
michael@0: 
michael@0: assertEq([42][0], 42);
michael@0: assertEq([42].length, 1);