async-func-dstr-var-async-ary-ptrn-rest-id-exhausted.js (2215B)
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-func-var-async.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 ( ForDeclaration of AssignmentExpression ) Statement 13 14 [...] 15 2. Return ? ForIn/OfBodyEvaluation(ForDeclaration, Statement, keyResult, 16 lexicalBinding, 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 [...] 32 iii. Else, 33 1. Assert: lhsKind is lexicalBinding. 34 2. Assert: lhs is a ForDeclaration. 35 3. Let status be the result of performing BindingInitialization 36 for lhs passing nextValue and iterationEnv as arguments. 37 [...] 38 39 13.3.3.6 Runtime Semantics: IteratorBindingInitialization 40 BindingRestElement : ... BindingIdentifier 41 1. Let lhs be ResolveBinding(StringValue of BindingIdentifier, 42 environment). 43 2. ReturnIfAbrupt(lhs). 3. Let A be ArrayCreate(0). 4. Let n=0. 5. Repeat, 44 [...] 45 b. If iteratorRecord.[[done]] is true, then 46 i. If environment is undefined, return PutValue(lhs, A). 47 ii. Return InitializeReferencedBinding(lhs, A). 48 49 ---*/ 50 51 var iterCount = 0; 52 var asyncIter = (async function*() { 53 yield* [[1, 2]]; 54 })(); 55 56 async function fn() { 57 for await (var [, , ...x] of asyncIter) { 58 assert(Array.isArray(x)); 59 assert.sameValue(x.length, 0); 60 61 iterCount += 1; 62 } 63 } 64 65 fn() 66 .then(() => assert.sameValue(iterCount, 1, 'iteration occurred as expected'), $DONE) 67 .then($DONE, $DONE);