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load(libdir + "asserts.js");
/*
* Throw a TypeError if the trap reports a new own property on a non-extensible
* object
*/
var target = {};
Object.preventExtensions(target);
var handler = { ownKeys: () => [ 'foo' ] };
for (let p of [new Proxy(target, handler), Proxy.revocable(target, handler).proxy])
assertThrowsInstanceOf(() => Object.getOwnPropertyNames(p), TypeError);