async-func-dstr-var-obj-ptrn-prop-id-init-skipped.js (2278B)
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.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 ( 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 13.3.3.7 Runtime Semantics: KeyedBindingInitialization 37 38 BindingElement : BindingPattern Initializer_opt 39 40 [...] 41 3. If Initializer is present and v is undefined, then 42 [...] 43 ---*/ 44 var initCount = 0; 45 function counter() { 46 initCount += 1; 47 } 48 49 var iterCount = 0; 50 51 async function fn() { 52 for await (var { s: t = counter(), u: v = counter(), w: x = counter(), y: z = counter() } of [{ s: null, u: 0, w: false, y: '' }]) { 53 assert.sameValue(t, null); 54 assert.sameValue(v, 0); 55 assert.sameValue(x, false); 56 assert.sameValue(z, ''); 57 assert.sameValue(initCount, 0); 58 59 assert.throws(ReferenceError, function() { 60 s; 61 }); 62 assert.throws(ReferenceError, function() { 63 u; 64 }); 65 assert.throws(ReferenceError, function() { 66 w; 67 }); 68 assert.throws(ReferenceError, function() { 69 y; 70 }); 71 72 iterCount += 1; 73 } 74 } 75 76 fn() 77 .then(() => assert.sameValue(iterCount, 1, 'iteration occurred as expected'), $DONE) 78 .then($DONE, $DONE);