const-ary-ptrn-elision.js (2229B)
1 // This file was procedurally generated from the following sources: 2 // - src/dstr-binding/ary-ptrn-elision.case 3 // - src/dstr-binding/default/for-of-const.template 4 /*--- 5 description: Elision advances iterator (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 ( 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 13.3.3.6 Runtime Semantics: IteratorBindingInitialization 39 40 ArrayBindingPattern : [ Elision ] 41 42 1. Return the result of performing 43 IteratorDestructuringAssignmentEvaluation of Elision with iteratorRecord 44 as the argument. 45 46 12.14.5.3 Runtime Semantics: IteratorDestructuringAssignmentEvaluation 47 48 Elision : , 49 50 1. If iteratorRecord.[[done]] is false, then 51 a. Let next be IteratorStep(iteratorRecord.[[iterator]]). 52 b. If next is an abrupt completion, set iteratorRecord.[[done]] to true. 53 c. ReturnIfAbrupt(next). 54 d. If next is false, set iteratorRecord.[[done]] to true. 55 2. Return NormalCompletion(empty). 56 57 ---*/ 58 var first = 0; 59 var second = 0; 60 function* g() { 61 first += 1; 62 yield; 63 second += 1; 64 }; 65 66 var iterCount = 0; 67 68 for (const [,] of [g()]) { 69 assert.sameValue(first, 1); 70 assert.sameValue(second, 0); 71 72 iterCount += 1; 73 } 74 75 assert.sameValue(iterCount, 1, 'iteration occurred as expected'); 76 77 reportCompare(0, 0);