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// Copyright (C) 2017 the V8 project authors. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.
/*---
desc: >
IteratorClose throws a TypeError when `return` returns a non-Object value
info: |
ArrayAssignmentPattern : [ AssignmentElementList ]
[...]
4. If iteratorRecord.[[Done]] is false, return ? IteratorClose(iterator, result).
5. Return result.
7.4.6 IteratorClose( iterator, completion )
[...]
5. Let innerResult be Call(return, iterator, « »).
6. If completion.[[Type]] is throw, return Completion(completion).
7. If innerResult.[[Type]] is throw, return Completion(innerResult).
8. If Type(innerResult.[[Value]]) is not Object, throw a TypeError exception.
features: [Symbol.iterator, generators]
template: async-generator
es6id: 12.14.5.2
esid: sec-runtime-semantics-destructuringassignmentevaluation
---*/
//- setup
let unreachable = 0;
let nextCount = 0;
let returnCount = 0;
let iterator = {
next() {
nextCount += 1;
return {done: false, value: undefined};
},
return() {
returnCount += 1;
return null;
}
};
let iterable = {
[Symbol.iterator]() {
return iterator;
}
};
//- elems
[ {} = yield ]
//- vals
iterable
//- body
unreachable += 1;
//- teardown
iter.next().then(result => {
assert.sameValue(nextCount, 1);
assert.sameValue(returnCount, 0);
assert.sameValue(result.value, undefined);
assert.sameValue(result.done, false);
iter.return().then(() => $DONE('Promise incorrectly fulfilled.'), ({ constructor }) => {
assert.sameValue(nextCount, 1);
assert.sameValue(returnCount, 1);
assert.sameValue(unreachable, 0);
assert.sameValue(constructor, TypeError);
}).then($DONE, $DONE);
}, $DONE).catch($DONE);