array-elem-trlg-iter-elision-iter-abpt.js (1845B)
1 // This file was procedurally generated from the following sources: 2 // - src/dstr-assignment/array-elem-trlg-iter-elision-iter-abpt.case 3 // - src/dstr-assignment/error/assignment-expr.template 4 /*--- 5 description: Abrupt completion returned during evaluation of elision (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 6. If Elision is present, then 23 a. Let status be the result of performing 24 IteratorDestructuringAssignmentEvaluation of Elision with 25 iteratorRecord as the argument. 26 b. If status is an abrupt completion, then 27 i. If iteratorRecord.[[done]] is false, return 28 IteratorClose(iterator, status). 29 ii. Return Completion(status). 30 31 ---*/ 32 var nextCount = 0; 33 var returnCount = 0; 34 var iterable = {}; 35 var x; 36 var iterator = { 37 next: function() { 38 nextCount += 1; 39 40 if (nextCount === 2) { 41 throw new Test262Error(); 42 } 43 44 // Set an upper-bound to limit unnecessary iteration in non-conformant 45 // implementations 46 return { done: nextCount > 10 }; 47 }, 48 return: function() { 49 returnCount += 1; 50 } 51 }; 52 iterable[Symbol.iterator] = function() { 53 return iterator; 54 }; 55 56 57 assert.throws(Test262Error, function() { 58 0, [ x , , ] = iterable; 59 }); 60 61 assert.sameValue(nextCount, 2); 62 assert.sameValue(returnCount, 0); 63 64 reportCompare(0, 0);