array-elem-trlg-iter-rest-thrw-close-skip.js (1814B)
1 // This file was procedurally generated from the following sources: 2 // - src/dstr-assignment/array-elem-trlg-iter-rest-thrw-close-skip.case 3 // - src/dstr-assignment/error/assignment-expr.template 4 /*--- 5 description: Abrupt completion returned during iteration for rest element (AssignmentExpression) 6 esid: sec-variable-statement-runtime-semantics-evaluation 7 features: [Symbol.iterator, 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 : 19 [ AssignmentElementList , Elisionopt AssignmentRestElementopt ] 20 21 [...] 22 7. If AssignmentRestElement is present, then 23 a. Let status be the result of performing 24 IteratorDestructuringAssignmentEvaluation of AssignmentRestElement 25 with iteratorRecord as the argument. 26 8. If iteratorRecord.[[done]] is false, return IteratorClose(iterator, 27 status). 28 9. Return Completion(status). 29 30 ---*/ 31 var nextCount = 0; 32 var returnCount = 0; 33 var iterable = {}; 34 var x; 35 var iterator = { 36 next: function() { 37 nextCount += 1; 38 39 if (nextCount === 2) { 40 throw new Test262Error(); 41 } 42 43 // Set an upper-bound to limit unnecessary iteration in non-conformant 44 // implementations 45 return { done: nextCount > 10 }; 46 }, 47 return: function() { 48 returnCount += 1; 49 } 50 }; 51 iterable[Symbol.iterator] = function() { 52 return iterator; 53 }; 54 55 assert.throws(Test262Error, function() { 56 0, [ x , ...x ] = iterable; 57 }); 58 59 assert.sameValue(nextCount, 2); 60 assert.sameValue(returnCount, 0); 61 62 reportCompare(0, 0);