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load(libdir + "asserts.js");
let p = {};
let x = new Proxy({__proto__: p}, {});
assertEq(Reflect.getPrototypeOf(x), p);
setImmutablePrototype(x);
assertEq(Reflect.getPrototypeOf(x), p);
assertEq(Reflect.setPrototypeOf(x, Date.prototype), false);
assertEq(Reflect.setPrototypeOf(x, p), true);
assertThrowsInstanceOf(() => Object.setPrototypeOf(x, Date.prototype), TypeError);
assertEq(Reflect.getPrototypeOf(x), p);
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