async-func-dstr-let-async-obj-ptrn-prop-ary.js (2162B)
1 // |reftest| async 2 // This file was procedurally generated from the following sources: 3 // - src/dstr-binding-for-await/obj-ptrn-prop-ary.case 4 // - src/dstr-binding-for-await/default/for-await-of-async-func-let-async.template 5 /*--- 6 description: Object binding pattern with "nested" array binding pattern not using initializer (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 13.3.3.7 Runtime Semantics: KeyedBindingInitialization 40 41 [...] 42 3. If Initializer is present and v is undefined, then 43 [...] 44 4. Return the result of performing BindingInitialization for BindingPattern 45 passing v and environment as arguments. 46 ---*/ 47 48 var iterCount = 0; 49 var asyncIter = (async function*() { 50 yield* [{ w: [7, undefined, ] }]; 51 })(); 52 53 async function fn() { 54 for await (let { w: [x, y, z] = [4, 5, 6] } of asyncIter) { 55 assert.sameValue(x, 7); 56 assert.sameValue(y, undefined); 57 assert.sameValue(z, undefined); 58 59 assert.throws(ReferenceError, function() { 60 w; 61 }); 62 63 iterCount += 1; 64 } 65 } 66 67 fn() 68 .then(() => assert.sameValue(iterCount, 1, 'iteration occurred as expected'), $DONE) 69 .then($DONE, $DONE);