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// Copyright (c) 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.
/*---
esid: sec-array.prototype.concat
es6id: 22.1.3.1_3
description: Array.prototype.concat sloppy arguments with dupes
flags: [noStrict]
includes: [compareArray.js]
features: [Symbol.isConcatSpreadable]
---*/
var args = (function(a, a, a) { return arguments; })(1,2,3);
args[Symbol.isConcatSpreadable] = true;
assert(compareArray([].concat(args, args), [1, 2, 3, 1, 2, 3]));
Object.defineProperty(args, "length", { value: 6 });
assert(compareArray([].concat(args), [1, 2, 3, void 0, void 0, void 0]));
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