iterator-close-throw-get-method-non-callable.js (1547B)
1 // |reftest| async 2 // Copyright (C) 2020 Alexey Shvayka. All rights reserved. 3 // This code is governed by the BSD license found in the LICENSE file. 4 /*--- 5 esid: sec-asynciteratorclose 6 description: > 7 If retrieving an iterator's `return` method generates an error while 8 closing the iterator with throw completion, this error should be suppressed. 9 info: | 10 AsyncIteratorClose ( iteratorRecord, completion ) 11 12 [...] 13 4. Let innerResult be GetMethod(iterator, "return"). 14 5. If innerResult.[[Type]] is normal, 15 [...] 16 6. If completion.[[Type]] is throw, return Completion(completion). 17 7. If innerResult.[[Type]] is throw, return Completion(innerResult). 18 19 GetMethod ( V, P ) 20 21 [...] 22 2. Let func be ? GetV(V, P). 23 3. If func is either undefined or null, return undefined. 24 4. If IsCallable(func) is false, throw a TypeError exception. 25 features: [async-iteration] 26 flags: [async] 27 ---*/ 28 29 const asyncIterable = {}; 30 asyncIterable[Symbol.asyncIterator] = function() { 31 return { 32 next: function() { 33 return { done: false, value: null }; 34 }, 35 return: true, 36 }; 37 }; 38 39 let iterationCount = 0; 40 const promise = (async function() { 41 for await (const x of asyncIterable) { 42 iterationCount += 1; 43 throw new Test262Error("should not be overriden"); 44 } 45 })(); 46 47 promise.then(function(value) { 48 throw new Test262Error("Promise should be rejected, got: " + value); 49 }, function(error) { 50 assert.sameValue(error.constructor, Test262Error); 51 assert.sameValue(iterationCount, 1, "The loop body is evaluated"); 52 }).then($DONE, $DONE);