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// |reftest| shell-option(--enable-iterator-helpers) skip-if(!this.hasOwnProperty('Iterator')||!xulRuntime.shell) -- iterator-helpers is not enabled unconditionally, requires shell-options
// Copyright (C) 2023 Michael Ficarra. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.
/*---
esid: sec-iteratorprototype.flatMap
description: >
Underlying iterator return is not called after result iterator observes that underlying iterator is exhausted
info: |
%Iterator.prototype%.flatMap ( mapper )
features: [iterator-helpers]
flags: []
---*/
let returnCount = 0;
class TestIterator extends Iterator {
next() {
return {
done: true,
value: undefined,
};
}
return() {
throw new Test262Error();
}
}
let iterator = new TestIterator().flatMap(x => [x]);
assert.throws(Test262Error, function () {
iterator.return();
});
iterator.next();
iterator.return();
iterator = new TestIterator().flatMap(x => [x]);
iterator.next();
iterator.return();
iterator = new TestIterator()
.flatMap(x => [x])
.flatMap(x => [x])
.flatMap(x => [x]);
assert.throws(Test262Error, function () {
iterator.return();
});
iterator.next();
iterator.return();
reportCompare(0, 0);
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