let p = Object.create({ foo: 1 });
let o = Object.create(p);

let other = { foo: 10 };

function foo() {
    return o.foo
}

for (let i = 0; i < 10; i++)
    foo();

p.__proto__ = null;
gc();

Object.defineProperty(other, "foo", { get() { } });

if (foo() !== undefined)
    throw new Error("bad get by id access");