async-func-dstr-var-async-obj-ptrn-prop-id-init-skipped.js (2454B)
1 // |reftest| async 2 // This file was procedurally generated from the following sources: 3 // - src/dstr-binding-for-await/obj-ptrn-prop-id-init-skipped.case 4 // - src/dstr-binding-for-await/default/for-await-of-async-func-var-async.template 5 /*--- 6 description: Destructuring initializer is not evaluated when value is not `undefined` (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 BindingElement : BindingPattern Initializer_opt 42 43 [...] 44 3. If Initializer is present and v is undefined, then 45 [...] 46 ---*/ 47 var initCount = 0; 48 function counter() { 49 initCount += 1; 50 } 51 52 var iterCount = 0; 53 var asyncIter = (async function*() { 54 yield* [{ s: null, u: 0, w: false, y: '' }]; 55 })(); 56 57 async function fn() { 58 for await (var { s: t = counter(), u: v = counter(), w: x = counter(), y: z = counter() } of asyncIter) { 59 assert.sameValue(t, null); 60 assert.sameValue(v, 0); 61 assert.sameValue(x, false); 62 assert.sameValue(z, ''); 63 assert.sameValue(initCount, 0); 64 65 assert.throws(ReferenceError, function() { 66 s; 67 }); 68 assert.throws(ReferenceError, function() { 69 u; 70 }); 71 assert.throws(ReferenceError, function() { 72 w; 73 }); 74 assert.throws(ReferenceError, function() { 75 y; 76 }); 77 78 iterCount += 1; 79 } 80 } 81 82 fn() 83 .then(() => assert.sameValue(iterCount, 1, 'iteration occurred as expected'), $DONE) 84 .then($DONE, $DONE);