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// Copyright 2014 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.
"use strict";
var obj = { length: 5 };
obj[Symbol.isConcatSpreadable] = true;
assertEquals(new Array(5), [].concat(obj));
obj.length = 4000;
assertEquals(new Array(4000), [].concat(obj));
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