async-gen-dstr-var-obj-ptrn-prop-obj.js (2013B)
1 // |reftest| async 2 // This file was procedurally generated from the following sources: 3 // - src/dstr-binding-for-await/obj-ptrn-prop-obj.case 4 // - src/dstr-binding-for-await/default/for-await-of-async-gen-var.template 5 /*--- 6 description: Object binding pattern with "nested" object 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 ( 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 [...] 39 3. If Initializer is present and v is undefined, then 40 [...] 41 4. Return the result of performing BindingInitialization for BindingPattern 42 passing v and environment as arguments. 43 ---*/ 44 45 var iterCount = 0; 46 47 async function *fn() { 48 for await (var { w: { x, y, z } = { x: 4, y: 5, z: 6 } } of [{ w: { x: undefined, z: 7 } }]) { 49 assert.sameValue(x, undefined); 50 assert.sameValue(y, undefined); 51 assert.sameValue(z, 7); 52 53 assert.throws(ReferenceError, function() { 54 w; 55 }); 56 57 iterCount += 1; 58 } 59 } 60 61 fn().next() 62 .then(() => assert.sameValue(iterCount, 1, 'iteration occurred as expected'), $DONE) 63 .then($DONE, $DONE);