async-gen-dstr-var-ary-ptrn-rest-id-exhausted.js (2046B)
1 // |reftest| async 2 // This file was procedurally generated from the following sources: 3 // - src/dstr-binding-for-await/ary-ptrn-rest-id-exhausted.case 4 // - src/dstr-binding-for-await/default/for-await-of-async-gen-var.template 5 /*--- 6 description: RestElement applied to an exhausted iterator (for-await-of statement) 7 esid: sec-for-in-and-for-of-statements-runtime-semantics-labelledevaluation 8 features: [Symbol.iterator, destructuring-binding, async-iteration] 9 flags: [generated, async] 10 info: | 11 IterationStatement : 12 for await ( var ForBinding of AssignmentExpression ) Statement 13 14 [...] 15 2. Return ? ForIn/OfBodyEvaluation(ForBinding, Statement, keyResult, 16 varBinding, labelSet, async). 17 18 13.7.5.13 Runtime Semantics: ForIn/OfBodyEvaluation 19 20 [...] 21 4. Let destructuring be IsDestructuring of lhs. 22 [...] 23 6. Repeat 24 [...] 25 j. If destructuring is false, then 26 [...] 27 k. Else 28 i. If lhsKind is assignment, then 29 [...] 30 ii. Else if lhsKind is varBinding, then 31 1. Assert: lhs is a ForBinding. 32 2. Let status be the result of performing BindingInitialization 33 for lhs passing nextValue and undefined as the arguments. 34 [...] 35 36 13.3.3.6 Runtime Semantics: IteratorBindingInitialization 37 BindingRestElement : ... BindingIdentifier 38 1. Let lhs be ResolveBinding(StringValue of BindingIdentifier, 39 environment). 40 2. ReturnIfAbrupt(lhs). 3. Let A be ArrayCreate(0). 4. Let n=0. 5. Repeat, 41 [...] 42 b. If iteratorRecord.[[done]] is true, then 43 i. If environment is undefined, return PutValue(lhs, A). 44 ii. Return InitializeReferencedBinding(lhs, A). 45 46 ---*/ 47 48 var iterCount = 0; 49 50 async function *fn() { 51 for await (var [, , ...x] of [[1, 2]]) { 52 assert(Array.isArray(x)); 53 assert.sameValue(x.length, 0); 54 55 iterCount += 1; 56 } 57 } 58 59 fn().next() 60 .then(() => assert.sameValue(iterCount, 1, 'iteration occurred as expected'), $DONE) 61 .then($DONE, $DONE);