var-ary-ptrn-rest-id-iter-step-err.js (2074B)
1 // This file was procedurally generated from the following sources: 2 // - src/dstr-binding/ary-ptrn-rest-id-iter-step-err.case 3 // - src/dstr-binding/error/for-of-var.template 4 /*--- 5 description: Error forwarding when IteratorStep returns an abrupt completion (for-of statement) 6 esid: sec-for-in-and-for-of-statements-runtime-semantics-labelledevaluation 7 features: [generators, destructuring-binding] 8 flags: [generated] 9 info: | 10 IterationStatement : 11 for ( var ForBinding of AssignmentExpression ) Statement 12 13 [...] 14 3. Return ForIn/OfBodyEvaluation(ForBinding, Statement, keyResult, 15 varBinding, labelSet). 16 17 13.7.5.13 Runtime Semantics: ForIn/OfBodyEvaluation 18 19 [...] 20 3. Let destructuring be IsDestructuring of lhs. 21 [...] 22 5. Repeat 23 [...] 24 h. If destructuring is false, then 25 [...] 26 i. Else 27 i. If lhsKind is assignment, then 28 [...] 29 ii. Else if lhsKind is varBinding, then 30 1. Assert: lhs is a ForBinding. 31 2. Let status be the result of performing BindingInitialization 32 for lhs passing nextValue and undefined as the arguments. 33 [...] 34 35 13.3.3.6 Runtime Semantics: IteratorBindingInitialization 36 BindingRestElement : ... BindingIdentifier 37 1. Let lhs be ResolveBinding(StringValue of BindingIdentifier, 38 environment). 39 2. ReturnIfAbrupt(lhs). 3. Let A be ArrayCreate(0). 4. Let n=0. 5. Repeat, 40 a. If iteratorRecord.[[done]] is false, 41 i. Let next be IteratorStep(iteratorRecord.[[iterator]]). 42 ii. If next is an abrupt completion, set iteratorRecord.[[done]] to 43 true. 44 iii. ReturnIfAbrupt(next). 45 46 ---*/ 47 var first = 0; 48 var second = 0; 49 var iter = function*() { 50 first += 1; 51 throw new Test262Error(); 52 second += 1; 53 }(); 54 55 assert.throws(Test262Error, function() { 56 for (var [...x] of [iter]) { 57 return; 58 } 59 }); 60 61 iter.next(); 62 assert.sameValue(first, 1); 63 assert.sameValue(second, 0, 'Iterator is closed following abrupt completion.'); 64 65 reportCompare(0, 0);