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// Copyright 2018 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
(function ArrayPrototypeChanged() {
const el = {
toString() {
Array.prototype[1] = '2';
return '1';
}
};
const a = [el, ,3];
assertSame("123", a.join(''));
})();
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