const-ary-ptrn-elem-ary-elision-iter.js (2012B)
1 // This file was procedurally generated from the following sources: 2 // - src/dstr-binding/ary-ptrn-elem-ary-elision-iter.case 3 // - src/dstr-binding/default/for-of-const.template 4 /*--- 5 description: BindingElement with array binding pattern and initializer is not used (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 BindingElement : BindingPatternInitializer opt 41 42 1. If iteratorRecord.[[done]] is false, then 43 a. Let next be IteratorStep(iteratorRecord.[[iterator]]). 44 [...] 45 e. Else, 46 i. Let v be IteratorValue(next). 47 [...] 48 4. Return the result of performing BindingInitialization of BindingPattern 49 with v and environment as the arguments. 50 51 ---*/ 52 var callCount = 0; 53 function* g() { 54 callCount += 1; 55 }; 56 57 var iterCount = 0; 58 59 for (const [[,] = g()] of [[[]]]) { 60 assert.sameValue(callCount, 0); 61 62 iterCount += 1; 63 } 64 65 assert.sameValue(iterCount, 1, 'iteration occurred as expected'); 66 67 reportCompare(0, 0);