async-gen-decl-dstr-obj-rest-valid-object.js (1855B)
1 // |reftest| async 2 // This file was procedurally generated from the following sources: 3 // - src/dstr-assignment-for-await/obj-rest-valid-object.case 4 // - src/dstr-assignment-for-await/default/async-gen-decl.template 5 /*--- 6 description: Rest object contains just unextracted data (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, a, b; 30 31 32 let iterCount = 0; 33 async function * fn() { 34 for await ({a, b, ...rest} of [{x: 1, y: 2, a: 5, b: 3}]) { 35 assert.sameValue(rest.a, undefined); 36 assert.sameValue(rest.b, undefined); 37 38 verifyProperty(rest, "x", { 39 enumerable: true, 40 writable: true, 41 configurable: true, 42 value: 1 43 }); 44 45 verifyProperty(rest, "y", { 46 enumerable: true, 47 writable: true, 48 configurable: true, 49 value: 2 50 }); 51 52 iterCount += 1; 53 } 54 } 55 56 let promise = fn().next(); 57 58 promise 59 .then(() => assert.sameValue(iterCount, 1, 'iteration occurred as expected'), $DONE) 60 .then($DONE, $DONE);