array-elem-iter-rtrn-close-err.js (1800B)
1 // This file was procedurally generated from the following sources: 2 // - src/dstr-assignment/array-elem-iter-rtrn-close-err.case 3 // - src/dstr-assignment/default/assignment-expr.template 4 /*--- 5 description: IteratorClose is called when reference evaluation produces a "return" completion (AssignmentExpression) 6 esid: sec-variable-statement-runtime-semantics-evaluation 7 features: [Symbol.iterator, generators, destructuring-binding] 8 flags: [generated] 9 info: | 10 VariableDeclaration : BindingPattern Initializer 11 12 1. Let rhs be the result of evaluating Initializer. 13 2. Let rval be GetValue(rhs). 14 3. ReturnIfAbrupt(rval). 15 4. Return the result of performing BindingInitialization for 16 BindingPattern passing rval and undefined as arguments. 17 18 ArrayAssignmentPattern : [ AssignmentElementList ] 19 20 [...] 21 5. If iteratorRecord.[[done]] is false, return IteratorClose(iterator, 22 result). 23 6. Return result. 24 25 7.4.6 IteratorClose( iterator, completion ) 26 27 [...] 28 6. Let innerResult be Call(return, iterator, « »). 29 7. If completion.[[type]] is throw, return Completion(completion). 30 8. If innerResult.[[type]] is throw, return Completion(innerResult). 31 32 ---*/ 33 var returnCount = 0; 34 var unreachable = 0; 35 var iterable = {}; 36 var iterator = { 37 return: function() { 38 returnCount += 1; 39 throw new Test262Error(); 40 } 41 }; 42 var iter; 43 iterable[Symbol.iterator] = function() { 44 return iterator; 45 }; 46 47 function* g() { 48 49 var result; 50 var vals = iterable; 51 52 result = [ {}[ yield ] ] = vals; 53 54 unreachable += 1; 55 56 assert.sameValue(result, vals); 57 58 } 59 iter = g(); 60 iter.next(); 61 assert.throws(Test262Error, function() { 62 iter.return(); 63 }); 64 65 assert.sameValue(returnCount, 1); 66 assert.sameValue(unreachable, 0, 'Unreachable statement was not executed'); 67 68 reportCompare(0, 0);