star-rhs-iter-nrml-res-value-err.js (1499B)
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: > 7 Abrupt completion returned when accessing `value` property of iteration 8 result 9 info: | 10 YieldExpression : yield * AssignmentExpression 11 12 1. Let exprRef be the result of evaluating AssignmentExpression. 13 2. Let value be ? GetValue(exprRef). 14 3. Let iterator be ? GetIterator(value). 15 4. Let received be NormalCompletion(undefined). 16 5. Repeat 17 a. If received.[[Type]] is normal, then 18 i. Let innerResult be ? IteratorNext(iterator, received.[[Value]]). 19 ii. Let done be ? IteratorComplete(innerResult). 20 iii. If done is true, then 21 1. Return ? IteratorValue(innerResult). 22 23 7.4.4 IteratorValue 24 25 1. Assert: Type(iterResult) is Object. 26 2. Return ? Get(iterResult, "value"). 27 features: [generators, Symbol.iterator] 28 ---*/ 29 30 var thrown = new Test262Error(); 31 var badIter = {}; 32 var poisonedValue = Object.defineProperty({ done: true }, 'value', { 33 get: function() { 34 throw thrown; 35 } 36 }); 37 badIter[Symbol.iterator] = function() { 38 return { 39 next: function() { 40 return poisonedValue; 41 } 42 }; 43 }; 44 function* g() { 45 try { 46 yield * badIter; 47 } catch (err) { 48 caught = err; 49 } 50 } 51 var iter = g(); 52 var result, caught; 53 54 result = iter.next(); 55 56 assert.sameValue(caught, thrown); 57 58 reportCompare(0, 0);