let-ary-init-iter-close.js (1939B)
1 // This file was procedurally generated from the following sources: 2 // - src/dstr-binding/ary-init-iter-close.case 3 // - src/dstr-binding/default/for-of-let.template 4 /*--- 5 description: Iterator is closed when not exhausted by pattern evaluation (for-of statement) 6 esid: sec-for-in-and-for-of-statements-runtime-semantics-labelledevaluation 7 features: [Symbol.iterator, destructuring-binding] 8 flags: [generated] 9 info: | 10 IterationStatement : 11 for ( ForDeclaration of AssignmentExpression ) Statement 12 13 [...] 14 3. Return ForIn/OfBodyEvaluation(ForDeclaration, Statement, keyResult, 15 lexicalBinding, 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 [...] 31 iii. Else, 32 1. Assert: lhsKind is lexicalBinding. 33 2. Assert: lhs is a ForDeclaration. 34 3. Let status be the result of performing BindingInitialization 35 for lhs passing nextValue and iterationEnv as arguments. 36 [...] 37 38 13.3.3.5 Runtime Semantics: BindingInitialization 39 40 BindingPattern : ArrayBindingPattern 41 42 [...] 43 4. If iteratorRecord.[[done]] is false, return ? IteratorClose(iterator, 44 result). 45 [...] 46 47 ---*/ 48 var doneCallCount = 0; 49 var iter = {}; 50 iter[Symbol.iterator] = function() { 51 return { 52 next: function() { 53 return { value: null, done: false }; 54 }, 55 return: function() { 56 doneCallCount += 1; 57 return {}; 58 } 59 }; 60 }; 61 62 var iterCount = 0; 63 64 for (let [x] of [iter]) { 65 assert.sameValue(doneCallCount, 1); 66 67 iterCount += 1; 68 } 69 70 assert.sameValue(iterCount, 1, 'Iteration occurred as expected'); 71 72 reportCompare(0, 0);