async-gen-decl-dstr-obj-rest-descriptors.js (1964B)
1 // |reftest| async 2 // This file was procedurally generated from the following sources: 3 // - src/dstr-assignment-for-await/obj-rest-descriptors.case 4 // - src/dstr-assignment-for-await/default/async-gen-decl.template 5 /*--- 6 description: Object created from rest deconstruction doesn't copy source object property descriptors. (for-await-of statement in an async generator declaration) 7 esid: sec-for-in-and-for-of-statements-runtime-semantics-labelledevaluation 8 features: [object-rest, destructuring-binding, async-iteration] 9 flags: [generated, async] 10 includes: [propertyHelper.js] 11 info: | 12 IterationStatement : 13 for await ( LeftHandSideExpression of AssignmentExpression ) Statement 14 15 1. Let keyResult be the result of performing ? ForIn/OfHeadEvaluation(« », 16 AssignmentExpression, iterate). 17 2. Return ? ForIn/OfBodyEvaluation(LeftHandSideExpression, Statement, 18 keyResult, assignment, labelSet). 19 20 13.7.5.13 Runtime Semantics: ForIn/OfBodyEvaluation 21 22 [...] 23 5. If destructuring is true and if lhsKind is assignment, then 24 a. Assert: lhs is a LeftHandSideExpression. 25 b. Let assignmentPattern be the parse of the source text corresponding to 26 lhs using AssignmentPattern as the goal symbol. 27 [...] 28 ---*/ 29 let rest; 30 let obj = {}; 31 Object.defineProperty(obj, "a", { value: 3, configurable: false, enumerable: true }); 32 Object.defineProperty(obj, "b", { value: 4, writable: false, enumerable: true }); 33 34 let iterCount = 0; 35 async function * fn() { 36 for await ({...rest} of [obj]) { 37 verifyProperty(rest, "a", { 38 enumerable: true, 39 writable: true, 40 configurable: true, 41 value: 3 42 }); 43 44 verifyProperty(rest, "b", { 45 enumerable: true, 46 writable: true, 47 configurable: true, 48 value: 4 49 }); 50 iterCount += 1; 51 } 52 } 53 54 let promise = fn().next(); 55 56 promise 57 .then(() => assert.sameValue(iterCount, 1, 'iteration occurred as expected'), $DONE) 58 .then($DONE, $DONE);