ary-ptrn-rest-ary-elision.js (1998B)
1 // This file was procedurally generated from the following sources: 2 // - src/dstr-binding/ary-ptrn-rest-ary-elision.case 3 // - src/dstr-binding/default/const-stmt.template 4 /*--- 5 description: Rest element containing an elision (`const` statement) 6 esid: sec-let-and-const-declarations-runtime-semantics-evaluation 7 features: [generators, destructuring-binding] 8 flags: [generated] 9 info: | 10 LexicalBinding : BindingPattern Initializer 11 12 1. Let rhs be the result of evaluating Initializer. 13 2. Let value be GetValue(rhs). 14 3. ReturnIfAbrupt(value). 15 4. Let env be the running execution context's LexicalEnvironment. 16 5. Return the result of performing BindingInitialization for BindingPattern 17 using value and env as the arguments. 18 19 13.3.3.6 Runtime Semantics: IteratorBindingInitialization 20 21 BindingRestElement : ... BindingPattern 22 23 1. Let A be ArrayCreate(0). 24 [...] 25 3. Repeat 26 [...] 27 b. If iteratorRecord.[[done]] is true, then 28 i. Return the result of performing BindingInitialization of 29 BindingPattern with A and environment as the arguments. 30 [...] 31 32 13.3.3.6 Runtime Semantics: IteratorBindingInitialization 33 34 ArrayBindingPattern : [ Elision ] 35 36 1. Return the result of performing 37 IteratorDestructuringAssignmentEvaluation of Elision with iteratorRecord 38 as the argument. 39 40 12.14.5.3 Runtime Semantics: IteratorDestructuringAssignmentEvaluation 41 42 Elision : , 43 44 1. If iteratorRecord.[[done]] is false, then 45 a. Let next be IteratorStep(iteratorRecord.[[iterator]]). 46 b. If next is an abrupt completion, set iteratorRecord.[[done]] to true. 47 c. ReturnIfAbrupt(next). 48 d. If next is false, set iteratorRecord.[[done]] to true. 49 2. Return NormalCompletion(empty). 50 51 ---*/ 52 var first = 0; 53 var second = 0; 54 function* g() { 55 first += 1; 56 yield; 57 second += 1; 58 }; 59 60 const [...[,]] = g(); 61 62 assert.sameValue(first, 1); 63 assert.sameValue(second, 1); 64 65 reportCompare(0, 0);