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load(libdir + "asserts.js");
// Throw a TypeError if the trap skips a non-configurable enumerable property
var target = {};
Object.defineProperty(target, 'foo', {
enumerable: true,
configurable: false
});
var handler = { ownKeys: () => [] };
for (let p of [new Proxy(target, handler), Proxy.revocable(target, handler).proxy])
assertThrowsInstanceOf(() => Object.keys(p), TypeError);
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