michael@0: // Forward to the target if the trap is not defined
michael@0: var proxy = Proxy(Object.create(Object.create(null, {
michael@0:     'foo': {
michael@0:         configurable: true
michael@0:     }
michael@0: }), {
michael@0:     'bar': {
michael@0:         configurable: true
michael@0:     }
michael@0: }), {});
michael@0: assertEq('foo' in proxy, true);
michael@0: assertEq('bar' in proxy, true);
michael@0: assertEq('baz' in proxy, false);