iterator-close-throw-get-method-abrupt.js (1219B)
1 // Copyright (C) 2020 Alexey Shvayka. All rights reserved. 2 // This code is governed by the BSD license found in the LICENSE file. 3 /*--- 4 esid: sec-iteratorclose 5 description: > 6 If retrieving an iterator's `return` method generates an error while 7 closing the iterator with throw completion, this error should be suppressed. 8 info: | 9 IteratorClose ( iteratorRecord, completion ) 10 11 [...] 12 4. Let innerResult be GetMethod(iterator, "return"). 13 5. If innerResult.[[Type]] is normal, 14 [...] 15 6. If completion.[[Type]] is throw, return Completion(completion). 16 7. If innerResult.[[Type]] is throw, return Completion(innerResult). 17 18 GetMethod ( V, P ) 19 20 [...] 21 2. Let func be ? GetV(V, P). 22 features: [Symbol.iterator] 23 ---*/ 24 25 var iterable = {}; 26 var iterationCount = 0; 27 28 iterable[Symbol.iterator] = function() { 29 return { 30 next: function() { 31 return { done: false, value: null }; 32 }, 33 get return() { 34 throw { name: 'inner error' }; 35 }, 36 }; 37 }; 38 39 assert.throws(Test262Error, function() { 40 for (var x of iterable) { 41 iterationCount += 1; 42 throw new Test262Error('should not be overriden'); 43 } 44 }); 45 46 assert.sameValue(iterationCount, 1, 'The loop body is evaluated'); 47 48 reportCompare(0, 0);