| // Copyright (C) 2016 the V8 project authors. All rights reserved. |
| // This code is governed by the BSD license found in the LICENSE file. |
| /*--- |
| esid: sec-generator-function-definitions-runtime-semantics-evaluation |
| es6id: 14.4.14 |
| description: > |
| Abrupt completion returned when accessing `value` property of iteration |
| result |
| info: | |
| YieldExpression : yield * AssignmentExpression |
| |
| 1. Let exprRef be the result of evaluating AssignmentExpression. |
| 2. Let value be ? GetValue(exprRef). |
| 3. Let iterator be ? GetIterator(value). |
| 4. Let received be NormalCompletion(undefined). |
| 5. Repeat |
| a. If received.[[Type]] is normal, then |
| [...] |
| b. Else if received.[[Type]] is throw, then |
| [...] |
| c. Else, |
| i. Assert: received.[[Type]] is return. |
| ii. Let return be ? GetMethod(iterator, "return"). |
| iii. If return is undefined, return Completion(received). |
| iv. Let innerReturnResult be ? Call(return, iterator, « |
| received.[[Value]] »). |
| v. If Type(innerReturnResult) is not Object, throw a TypeError |
| exception. |
| vi. Let done be ? IteratorComplete(innerReturnResult). |
| vii. If done is true, then |
| 1. Let value be ? IteratorValue(innerReturnResult). |
| |
| 7.4.4 IteratorValue |
| |
| 1. Assert: Type(iterResult) is Object. |
| 2. Return ? Get(iterResult, "value"). |
| features: [generators, Symbol.iterator] |
| ---*/ |
| |
| var thrown = new Test262Error(); |
| var badIter = {}; |
| var poisonedValue = Object.defineProperty({ done: true }, 'value', { |
| get: function() { |
| throw thrown; |
| } |
| }); |
| badIter[Symbol.iterator] = function() { |
| return { |
| next: function() { |
| return { done: false }; |
| }, |
| return: function() { |
| return poisonedValue; |
| } |
| }; |
| }; |
| function* g() { |
| try { |
| yield * badIter; |
| } catch (err) { |
| caught = err; |
| } |
| } |
| var iter = g(); |
| var caught; |
| |
| iter.next(); |
| iter.return(); |
| |
| assert.sameValue(caught, thrown); |