dflt-ary-ptrn-rest-id-iter-step-err.js (1650B)
1 // This file was procedurally generated from the following sources: 2 // - src/dstr-binding/ary-ptrn-rest-id-iter-step-err.case 3 // - src/dstr-binding/error/async-gen-func-decl-dflt.template 4 /*--- 5 description: Error forwarding when IteratorStep returns an abrupt completion (async generator function declaration (default parameter)) 6 esid: sec-asyncgenerator-definitions-instantiatefunctionobject 7 features: [generators, async-iteration] 8 flags: [generated] 9 info: | 10 AsyncGeneratorDeclaration : async [no LineTerminator here] function * BindingIdentifier 11 ( FormalParameters ) { AsyncGeneratorBody } 12 13 [...] 14 3. Let F be ! AsyncGeneratorFunctionCreate(Normal, FormalParameters, AsyncGeneratorBody, 15 scope, strict). 16 [...] 17 18 13.3.3.6 Runtime Semantics: IteratorBindingInitialization 19 BindingRestElement : ... BindingIdentifier 20 1. Let lhs be ResolveBinding(StringValue of BindingIdentifier, 21 environment). 22 2. ReturnIfAbrupt(lhs). 3. Let A be ArrayCreate(0). 4. Let n=0. 5. Repeat, 23 a. If iteratorRecord.[[done]] is false, 24 i. Let next be IteratorStep(iteratorRecord.[[iterator]]). 25 ii. If next is an abrupt completion, set iteratorRecord.[[done]] to 26 true. 27 iii. ReturnIfAbrupt(next). 28 29 ---*/ 30 var first = 0; 31 var second = 0; 32 var iter = function*() { 33 first += 1; 34 throw new Test262Error(); 35 second += 1; 36 }(); 37 38 39 async function* f([...x] = iter) { 40 41 }; 42 43 assert.throws(Test262Error, function() { 44 f(); 45 }); 46 47 iter.next(); 48 assert.sameValue(first, 1); 49 assert.sameValue(second, 0, 'Iterator is closed following abrupt completion.'); 50 51 reportCompare(0, 0);