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// |reftest| skip-if(!this.hasOwnProperty('AsyncIterator'))
//
//
/*---
esid: pending
description: Lazy %AsyncIterator.prototype% methods don't close the iterator if `then` returned by `next` throws.
info: >
AsyncIterator Helpers proposal 2.1.6
features: [iterator-helpers]
---*/
class TestError extends Error {}
class TestIterator extends AsyncIterator {
next() {
return {
then() {
throw new TestError();
}
};
}
closed = false;
async return(value) {
this.closed = true;
return {done: true, value};
}
}
const methods = [
["map", x => x],
["filter", x => true],
["take", Infinity],
["drop", 0],
["asIndexedPairs", undefined],
["flatMap", async function*(x) { yield x; }],
];
(async () => {
for (const [method, arg] of methods) {
const iterator = new TestIterator();
assertEq(iterator.closed, false);
try {
await iterator[method](arg).next();
assertEq(true, false, 'Expected exception');
} catch(err) {
console.log(err);
assertEq(err instanceof TestError, true);
}
assertEq(iterator.closed, false);
}
})();
if (typeof reportCompare == 'function')
reportCompare(0, 0);
|
