| // 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 the @@iterator property |
| 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). |
| |
| 7.4.1 GetIterator |
| |
| 1. If method was not passed, then |
| a. Let method be ? GetMethod(obj, @@iterator). |
| features: [generators, Symbol.iterator] |
| ---*/ |
| |
| var thrown = new Test262Error(); |
| var poisonedIter = Object.defineProperty({}, Symbol.iterator, { |
| get: function() { |
| throw thrown; |
| } |
| }); |
| function* g() { |
| try { |
| yield * poisonedIter; |
| } catch (err) { |
| caught = err; |
| } |
| } |
| var iter = g(); |
| var result, caught; |
| |
| assert.sameValue(caught, undefined, 'property is not accessed eagerly'); |
| |
| result = iter.next(); |
| |
| assert.sameValue(result.value, undefined, 'iteration value'); |
| assert.sameValue(result.done, true, 'iteration status'); |
| assert.sameValue(caught, thrown, 'error value'); |