| // Copyright (C) 2018 Kevin Gibbons. All rights reserved. |
| // This code is governed by the BSD license found in the LICENSE file. |
| |
| /*--- |
| esid: sec-object.fromentries |
| description: Closes iterators when accessing an entry's key throws. |
| info: | |
| Object.fromEntries ( iterable ) |
| |
| ... |
| 4. Let stepsDefine be the algorithm steps defined in CreateDataPropertyOnObject Functions. |
| 5. Let adder be CreateBuiltinFunction(stepsDefine, « »). |
| 6. Return ? AddEntriesFromIterable(obj, iterable, adder). |
| |
| AddEntriesFromIterable ( target, iterable, adder ) |
| |
| ... |
| 4. Repeat, |
| ... |
| e. Let k be Get(nextItem, "0"). |
| f. If k is an abrupt completion, return ? IteratorClose(iteratorRecord, k). |
| |
| features: [Symbol.iterator, Object.fromEntries] |
| ---*/ |
| |
| function DummyError() {} |
| |
| var returned = false; |
| var iterable = { |
| [Symbol.iterator]: function() { |
| var advanced = false; |
| return { |
| next: function() { |
| if (advanced) { |
| throw new Test262Error('should only advance once'); |
| } |
| advanced = true; |
| return { |
| done: false, |
| value: { |
| get '0'() { |
| throw new DummyError(); |
| }, |
| }, |
| }; |
| }, |
| return: function() { |
| if (returned) { |
| throw new Test262Error('should only return once'); |
| } |
| returned = true; |
| }, |
| }; |
| }, |
| }; |
| |
| assert.throws(DummyError, function() { |
| Object.fromEntries(iterable); |
| }); |
| |
| assert(returned, 'iterator should be closed when entry property access throws'); |