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path: root/js/src/jit-test/tests/proxy/testDirectProxyKeys4.js
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load(libdir + "asserts.js");

// Throw TypeError if trap returns a property key multiple times.

var handler = { ownKeys: () => [ 'foo', 'foo' ] };
for (let p of [new Proxy({}, handler), Proxy.revocable({}, handler).proxy])
    assertThrowsInstanceOf(() => Object.keys(p), TypeError);