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// |reftest| async
// Copyright (C) 2018 Valerie Young. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.
/*---
esid: sec-%asyncfromsynciteratorprototype%.throw
description: return() will return value undefined if sync `return` is undefined
info: |
%AsyncFromSyncIteratorPrototype%.return ( value )
...
2. Let promiseCapability be ! NewPromiseCapability(%Promise%).
...
5. Let return be GetMethod(syncIterator, "return").
6. IfAbruptRejectPromise(return, promiseCapability).
7. If return is undefined, then
a. Let iterResult be ! CreateIterResultObject(value, true).
b. Perform ! Call(promiseCapability.[[Resolve]], undefined, « iterResult »).
c. Return promiseCapability.[[Promise]].
flags: [async]
features: [async-iteration]
---*/
var obj = {
[Symbol.iterator]() {
return {
next() {
return { value: 1, done: false };
}
};
}
};
async function* asyncg() {
yield* obj;
}
var iter = asyncg();
iter.next().then(function(result) {
iter.return().then(function(result) {
assert.sameValue(result.done, true, 'the iterator is completed');
assert.sameValue(result.value, undefined, 'expect value to be undefined');
iter.next().then(({ done, value }) => {
assert.sameValue(done, true, 'the iterator is completed');
assert.sameValue(value, undefined, 'value is undefined');
}).then($DONE, $DONE);
}).catch($DONE);
}).catch($DONE);
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