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// Copyright (C) 2018 Valerie Young. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.
/*---
esid: sec-asyncgeneratorfunction
description: Definition of instance `length` property
info: |
AsyncGeneratorFunction ( p1, p2, … , pn, body )
...
3. Return CreateDynamicFunction(C, NewTarget, "async generator", args).
Runtime Semantics: CreateDynamicFunction
...
28. If kind is "generator" or "async generator", then
a. If parameters Contains YieldExpression is true, throw a SyntaxError
exception.
features: [async-iteration]
flags: [async]
---*/
var AsyncGeneratorFunction = Object.getPrototypeOf(async function* () {}).constructor;
// YieldExpression is permitted in function body.
AsyncGeneratorFunction('x = yield');
assert.throws(SyntaxError, function() {
AsyncGeneratorFunction('x = yield', '');
}, 'YieldExpression not permitted generally');
var withinAsyncGenerator = async function*() {
AsyncGeneratorFunction('x = yield', '');
};
withinAsyncGenerator().next().then(
function () {
throw new Test262Error("YieldExpression not permitted when calling context is a async generator");
},
function (e) {
if (!(e instanceof SyntaxError)) {
throw new Test262Error("Expected SyntaxError but got " + e);
}
}
).then($DONE, $DONE);
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