async-gen-dstr-let-async-obj-ptrn-prop-id-trailing-comma.js (1957B)
1 // |reftest| async 2 // This file was procedurally generated from the following sources: 3 // - src/dstr-binding-for-await/obj-ptrn-prop-id-trailing-comma.case 4 // - src/dstr-binding-for-await/default/for-await-of-async-gen-let-async.template 5 /*--- 6 description: Trailing comma is allowed following BindingPropertyList (for-await-of statement) 7 esid: sec-for-in-and-for-of-statements-runtime-semantics-labelledevaluation 8 features: [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 Destructuring Binding Patterns 40 41 ObjectBindingPattern[Yield] : 42 { } 43 { BindingPropertyList[?Yield] } 44 { BindingPropertyList[?Yield] , } 45 ---*/ 46 47 var iterCount = 0; 48 var asyncIter = (async function*() { 49 yield* [{ x: 23 }]; 50 })(); 51 52 async function *fn() { 53 for await (let { x: y, } of asyncIter) { 54 assert.sameValue(y, 23); 55 56 assert.throws(ReferenceError, function() { 57 x; 58 }); 59 60 iterCount += 1; 61 } 62 } 63 64 fn().next() 65 .then(() => assert.sameValue(iterCount, 1, 'iteration occurred as expected'), $DONE) 66 .then($DONE, $DONE);