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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.
// Flags: --allow-natives-syntax
var obj = { length: 1, 0: "spread" };
obj[Symbol.toStringTag] = "foo";
obj[Symbol.hasInstance] = function() { return true; }
obj[Symbol.isConcatSpreadable] = true;
var obj2 = { ...obj };
// Crash if fast result map bitfield is not set correctly, if verifying heap
%HeapObjectVerify(obj2);
// Ensure correct result for some well-known symbols
assertEquals("[object foo]", Object.prototype.toString.call(obj2));
assertTrue(Uint8Array instanceof obj2);
assertEquals(["spread"], [].concat(obj2));
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