mirror of https://github.com/tc39/test262.git
43 lines
1.3 KiB
JavaScript
43 lines
1.3 KiB
JavaScript
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// Copyright (C) 2018 Valerie Young. 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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esid: sec-asyncgeneratorfunction
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description: Definition of instance `length` property
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info: |
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AsyncGeneratorFunction ( p1, p2, … , pn, body )
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...
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3. Return CreateDynamicFunction(C, NewTarget, "async generator", args).
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Runtime Semantics: CreateDynamicFunction
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...
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29. If kind is "async" or "async generator", then
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a. If parameters Contains AwaitExpression is true, throw a SyntaxError
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exception.
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features: [async-iteration]
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flags: [async]
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---*/
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var AsyncGeneratorFunction = Object.getPrototypeOf(async function* () {}).constructor;
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// AwaitExpression is permitted in function body.
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AsyncGeneratorFunction('x = await 42');
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assert.throws(SyntaxError, function() {
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AsyncGeneratorFunction('x = await 42', '');
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}, 'AwaitExpression not permitted in parameters');
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var withinAsyncGenerator = async function*() {
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AsyncGeneratorFunction('x = await 42', '');
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};
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withinAsyncGenerator().next().then(
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function () {
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throw new Test262Error("AwaitExpression not permitted when calling context is a async generator");
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},
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function (e) {
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if (!(e instanceof SyntaxError)) {
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throw new Test262Error("Expected SyntaxError but got " + e);
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}
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}
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).then($DONE, $DONE);
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