Strict mode Passingnon-Strict mode Passing
Features:
- Proxy
// Copyright (C) 2016 the V8 project authors. All rights reserved. // This code is governed by the BSD license found in the LICENSE file. /*--- esid: sec-isconcatspreadable description: > Revoked proxy value produces a TypeError during access of `Symbol.isConcatSpreadable` property info: | [...] 5. Repeat, while items is not empty a. Remove the first element from items and let E be the value of the element. b. Let spreadable be ? IsConcatSpreadable(E). c. If spreadable is true, then [...] e. Else E is added as a single item rather than spread, [...] ES6 22.1.3.1.1: Runtime Semantics: IsConcatSpreadable ( O ) 1. If Type(O) is not Object, return false. 2. Let spreadable be ? Get(O, @@isConcatSpreadable). 7.3.1 Get [...] 3. Return ? O.[[Get]](P, O). 9.5.8 [[Get]] [...] 2. Let handler be O.[[ProxyHandler]]. 3. If handler is null, throw a TypeError exception. features: [Proxy] ---*/ var handle = Proxy.revocable([], {}); handle.revoke(); assert.throws(TypeError, function() { [].concat(handle.proxy); }, '[].concat(handle.proxy) throws a TypeError exception');