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39 lines
1.1 KiB
JavaScript
39 lines
1.1 KiB
JavaScript
// Copyright 2016 Microsoft, Inc. All rights reserved.
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// This code is governed by the BSD license found in the LICENSE file.
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/*---
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author: Brian Terlson <brian.terlson@microsoft.com>
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esid: sec-async-function-instances
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description: >
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Async function instances are not constructors and do not have a
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[[Construct]] slot.
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info: |
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25.5.1.1 AsyncFunction( p1, p2, … , pn, body )
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...
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3. Return CreateDynamicFunction(C, NewTarget, "async", args).
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19.2.1.1.1 Runtime Semantics: CreateDynamicFunction( constructor, newTarget, kind, args )
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...
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33. Perform FunctionInitialize(F, Normal, parameters, body, scope).
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34. If kind is "generator", then
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...
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35. Else if kind is "normal", perform MakeConstructor(F).
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36. NOTE: Async functions are not constructable and do not have a [[Construct]] internal method
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or a "prototype" property.
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...
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---*/
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async function foo() {}
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assert.throws(TypeError, function() {
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new foo();
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});
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var AsyncFunction = Object.getPrototypeOf(foo).constructor;
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var instance = AsyncFunction();
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assert.throws(TypeError, function() {
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new instance();
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})
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