mirror of https://github.com/tc39/test262.git
24 lines
913 B
JavaScript
24 lines
913 B
JavaScript
// Copyright 2018 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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var sentinel = {};
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Object.defineProperty(Promise, Symbol.species, {
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value: function(f) {
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f(function() {}, function() {})
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return sentinel;
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}
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});
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// According to the WebAssembly JavaScript API spec, WebAssembly.instantiate is
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// using the initial value of the Promise constructor. Specifically it ignores
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// the Promise species constructor installed above.
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var promise = WebAssembly.instantiate(new ArrayBuffer());
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assertInstanceof(promise, Promise);
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assertNotSame(promise, sentinel);
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// All further uses of the returned Promise, like using Promise.prototype.then,
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// will respect the Promise species constructor installed above however.
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var monkey = promise.then(r => { print(r) }, e => { print(e) });
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assertSame(monkey, sentinel);
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