// Copyright (C) 2016 the V8 project authors. All rights reserved. // This code is governed by the BSD license found in the LICENSE file. /*--- desc: > IteratorClose is called when reference evaluation produces a "return" completion info: | ArrayAssignmentPattern : [ AssignmentElementList ] [...] 5. If iteratorRecord.[[done]] is false, return IteratorClose(iterator, result). 6. Return result. 7.4.6 IteratorClose( iterator, completion ) [...] 6. Let innerResult be Call(return, iterator, « »). 7. If completion.[[type]] is throw, return Completion(completion). 8. If innerResult.[[type]] is throw, return Completion(innerResult). features: [Symbol.iterator, generators] template: default es6id: 12.14.5.2 esid: sec-runtime-semantics-destructuringassignmentevaluation ---*/ //- setup var nextCount = 0; var returnCount = 0; var unreachable = 0; var thisValue = null; var args = null; var iterator = { next: function() { nextCount += 1; return {done: false, value: undefined}; }, return: function() { returnCount += 1; thisValue = this; args = arguments; return {}; } }; var iterable = {}; iterable[Symbol.iterator] = function() { return iterator; }; function* g() { //- elems [ {} = yield ] //- vals iterable //- body unreachable += 1; //- teardown } var iter = g(); iter.next(); assert.sameValue(nextCount, 1); assert.sameValue(returnCount, 0); var result = iter.return(777); assert.sameValue(nextCount, 1); assert.sameValue(returnCount, 1); assert.sameValue(unreachable, 0, 'Unreachable statement was not executed'); assert.sameValue(result.value, 777); assert(result.done, 'Iterator correctly closed'); assert.sameValue(thisValue, iterator, 'correct `this` value'); assert(!!args, 'arguments object provided'); assert.sameValue(args.length, 0, 'zero arguments specified');