js/src/tests/test262/built-ins/Iterator/prototype/filter/underlying-iterator-closed-in-parallel.js


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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.filter
description: >
  Underlying iterator is closed after calling filter
info: |
  %Iterator.prototype%.filter ( predicate )

features: [iterator-helpers]
flags: []
---*/
let iterator = (function* () {
  for (let i = 0; i < 5; ++i) {
    yield i;
  }
})();

let filtered = iterator.filter(() => true);

iterator.return();

let { value, done } = filtered.next();

assert.sameValue(value, undefined);
assert.sameValue(done, true);

reportCompare(0, 0);