mirror of https://github.com/tc39/test262.git
76 lines
1.9 KiB
JavaScript
76 lines
1.9 KiB
JavaScript
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// Copyright (C) 2020 Alexey Shvayka. All rights reserved.
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// This code is governed by the BSD license found in the LICENSE file.
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/*---
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esid: sec-generator-function-definitions-runtime-semantics-evaluation
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description: >
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If iterator's "throw" method is `null`,
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AsyncIteratorClose is called before rising TypeError.
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info: |
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YieldExpression : yield * AssignmentExpression
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[...]
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7. Repeat,
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[...]
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b. Else if received.[[Type]] is throw, then
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i. Let throw be ? GetMethod(iterator, "throw").
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ii. If throw is not undefined, then
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[...]
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iii. Else,
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[...]
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3. If generatorKind is async, perform ? AsyncIteratorClose(iteratorRecord, closeCompletion).
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[...]
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6. Throw a TypeError exception.
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GetMethod ( V, P )
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[...]
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2. Let func be ? GetV(V, P).
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3. If func is either undefined or null, return undefined.
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AsyncIteratorClose ( iteratorRecord, completion )
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[...]
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4. Let innerResult be GetMethod(iterator, "return").
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5. If innerResult.[[Type]] is normal, then
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a. Let return be innerResult.[[Value]].
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b. If return is undefined, return Completion(completion).
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features: [Symbol.asyncIterator, async-iteration]
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flags: [async]
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---*/
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var throwGets = 0;
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var returnGets = 0;
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var asyncIterable = {
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[Symbol.asyncIterator]: function() {
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return this;
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},
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next: function() {
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return {value: 1, done: false};
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},
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get throw() {
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throwGets += 1;
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return null;
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},
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get return() {
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returnGets += 1;
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},
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};
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async function* asyncGenerator() {
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yield* asyncIterable;
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}
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var asyncIterator = asyncGenerator();
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asyncIterator.next().then(function() {
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asyncIterator.throw().then(
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function(result) {
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throw new Test262Error("Promise should be rejected, got: " + result.value);
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},
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function(err) {
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assert.sameValue(err.constructor, TypeError);
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assert.sameValue(throwGets, 1);
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assert.sameValue(returnGets, 1);
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},
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).then($DONE, $DONE);
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}).catch($DONE);
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