star-rhs-iter-thrw-thrw-call-err.js (1448B)
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 invoking iterator `throw` 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 i. Let throw be ? GetMethod(iterator, "throw"). 19 ii. If throw is not undefined, then 20 1. Let innerResult be ? Call(throw, iterator, « received.[[Value]] 21 »). 22 features: [generators, Symbol.iterator] 23 ---*/ 24 25 var thrown = new Test262Error(); 26 var badIter = {}; 27 badIter[Symbol.iterator] = function() { 28 return { 29 next: function() { 30 return { done: false }; 31 }, 32 throw: function() { 33 throw thrown; 34 } 35 }; 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 iter.next(); 48 result = iter.throw(); 49 50 assert.sameValue(result.value, undefined); 51 assert.sameValue(result.done, true); 52 assert.sameValue(caught, thrown); 53 54 reportCompare(0, 0);