diff options
Diffstat (limited to 'js/src/tests/test262/built-ins/Array/prototype/concat/is-concat-spreadable-is-array-proxy-revoked.js')
-rw-r--r-- | js/src/tests/test262/built-ins/Array/prototype/concat/is-concat-spreadable-is-array-proxy-revoked.js | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/Array/prototype/concat/is-concat-spreadable-is-array-proxy-revoked.js b/js/src/tests/test262/built-ins/Array/prototype/concat/is-concat-spreadable-is-array-proxy-revoked.js new file mode 100644 index 0000000000..e242f57045 --- /dev/null +++ b/js/src/tests/test262/built-ins/Array/prototype/concat/is-concat-spreadable-is-array-proxy-revoked.js @@ -0,0 +1,52 @@ +// 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 when supplied to IsArray +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). + 3. If spreadable is not undefined, return ToBoolean(spreadable). + 4. Return ? IsArray(O). + + 7.2.2 IsArray + + [...] + 3. If argument is a Proxy exotic object, then + a. If the value of the [[ProxyHandler]] internal slot of argument is null, + throw a TypeError exception. + b. Let target be the value of the [[ProxyTarget]] internal slot of + argument. + c. Return ? IsArray(target). +features: [Proxy, Symbol.isConcatSpreadable] +---*/ + +var target = []; +var handle = Proxy.revocable(target, { + get: function(_, key) { + // Defer proxy revocation until after property access to ensure that the + // expected TypeError originates from the IsArray operation. + if (key === Symbol.isConcatSpreadable) { + handle.revoke(); + } + return target[key]; + } +}); + +assert.throws(TypeError, function() { + [].concat(handle.proxy); +}, '[].concat(handle.proxy) throws a TypeError exception'); + +reportCompare(0, 0); |