// 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-syntaxvarobj={length:1,0:"spread"};obj[Symbol.toStringTag]="foo";obj[Symbol.hasInstance]=function(){returntrue;}obj[Symbol.isConcatSpreadable]=true;varobj2={...obj};// Crash if fast result map bitfield is not set correctly, if verifying heap%HeapObjectVerify(obj2);// Ensure correct result for some well-known symbolsassertEquals("[object foo]",Object.prototype.toString.call(obj2));assertTrue(Uint8Arrayinstanceofobj2);assertEquals(["spread"],[].concat(obj2));