star-rhs-iter-nrml-next-get-err.js (1388B)
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: Abrupt completion returned when accessing iterator `next` 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 i. Let innerResult be ? IteratorNext(iterator, received.[[Value]]). 17 18 7.4.2 IteratorNext 19 20 1. If value was not passed, then 21 [...] 22 2. Else, 23 a. Let result be ? Invoke(iterator, "next", « value »). 24 features: [generators, Symbol.iterator] 25 ---*/ 26 27 var thrown = new Test262Error(); 28 var badIter = {}; 29 var poisonedNext = Object.defineProperty({}, 'next', { 30 get: function() { 31 throw thrown; 32 } 33 }); 34 badIter[Symbol.iterator] = function() { 35 return poisonedNext; 36 }; 37 function* g() { 38 try { 39 yield * badIter; 40 } catch (err) { 41 caught = err; 42 } 43 } 44 var iter = g(); 45 var result, caught; 46 47 result = iter.next(); 48 49 assert.sameValue(result.value, undefined); 50 assert.sameValue(result.done, true); 51 assert.sameValue(caught, thrown); 52 53 reportCompare(0, 0);