// 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
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],
  '[].concat((function(a, a, a) {return arguments;})(1, 2, 3), (function(a, a, a) {return arguments;})(1, 2, 3)) must return [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],
  '[].concat((function(a, a, a) {return arguments;})(1, 2, 3)) must return [1, 2, 3, void 0, void 0, void 0]'
);