star-rhs-iter-rtrn-rtrn-invoke.js (1605B)
1 // Copyright (C) 2016 the V8 project authors. All rights reserved. 2 // This code is governed by the BSD license found in the LICENSE file. 3 /*--- 4 esid: sec-generator-function-definitions-runtime-semantics-evaluation 5 es6id: 14.4.14 6 description: Invocation of iterator `return` method 7 info: | 8 YieldExpression : yield * AssignmentExpression 9 10 1. Let exprRef be the result of evaluating AssignmentExpression. 11 2. Let value be ? GetValue(exprRef). 12 3. Let iterator be ? GetIterator(value). 13 4. Let received be NormalCompletion(undefined). 14 5. Repeat 15 a. If received.[[Type]] is normal, then 16 [...] 17 b. Else if received.[[Type]] is throw, then 18 [...] 19 c. Else, 20 i. Assert: received.[[Type]] is return. 21 ii. Let return be ? GetMethod(iterator, "return"). 22 iii. If return is undefined, return Completion(received). 23 iv. Let innerReturnResult be ? Call(return, iterator, « 24 received.[[Value]] »). 25 [...] 26 features: [generators, Symbol.iterator] 27 ---*/ 28 29 var args, thisValue; 30 var callCount = 0; 31 var spyIterator = { 32 next: function() { 33 return { done: false }; 34 }, 35 return: function() { 36 callCount += 1; 37 args = arguments; 38 thisValue = this; 39 return { done: true }; 40 } 41 }; 42 var spyIterable = {}; 43 spyIterable[Symbol.iterator] = function() { 44 return spyIterator; 45 }; 46 function* g() { 47 yield * spyIterable; 48 } 49 var iter = g(); 50 51 iter.next(8888); 52 iter.return(7777); 53 54 assert.sameValue(callCount, 1); 55 assert.sameValue(args.length, 1); 56 assert.sameValue(args[0], 7777); 57 assert.sameValue(thisValue, spyIterator); 58 59 reportCompare(0, 0);