michael@0: function testDeepPropertyShadowing()
michael@0: {
michael@0:     function h(node) {
michael@0:         var x = 0;
michael@0:         while (node) {
michael@0:             x++;
michael@0:             node = node.parent;
michael@0:         }
michael@0:         return x;
michael@0:     }
michael@0:     var tree = {__proto__: {__proto__: {parent: null}}};
michael@0:     h(tree);
michael@0:     h(tree);
michael@0:     tree.parent = {};
michael@0:     assertEq(h(tree), 2);
michael@0: }
michael@0: testDeepPropertyShadowing();