dflt-ary-ptrn-rest-ary-empty.js (1587B)
1 // |reftest| async 2 // This file was procedurally generated from the following sources: 3 // - src/dstr-binding/ary-ptrn-rest-ary-empty.case 4 // - src/dstr-binding/default/async-gen-func-decl-dflt.template 5 /*--- 6 description: Rest element containing an "empty" array pattern (async generator function declaration (default parameter)) 7 esid: sec-asyncgenerator-definitions-instantiatefunctionobject 8 features: [generators, async-iteration] 9 flags: [generated, async] 10 info: | 11 AsyncGeneratorDeclaration : async [no LineTerminator here] function * BindingIdentifier 12 ( FormalParameters ) { AsyncGeneratorBody } 13 14 [...] 15 3. Let F be ! AsyncGeneratorFunctionCreate(Normal, FormalParameters, AsyncGeneratorBody, 16 scope, strict). 17 [...] 18 19 20 13.3.3.6 Runtime Semantics: IteratorBindingInitialization 21 22 BindingRestElement : ... BindingPattern 23 24 1. Let A be ArrayCreate(0). 25 [...] 26 3. Repeat 27 [...] 28 b. If iteratorRecord.[[done]] is true, then 29 i. Return the result of performing BindingInitialization of 30 BindingPattern with A and environment as the arguments. 31 [...] 32 33 13.3.3.6 Runtime Semantics: IteratorBindingInitialization 34 35 ArrayBindingPattern : [ ] 36 37 1. Return NormalCompletion(empty). 38 39 ---*/ 40 var iterations = 0; 41 var iter = function*() { 42 iterations += 1; 43 }(); 44 45 46 var callCount = 0; 47 async function* f([...[]] = iter) { 48 assert.sameValue(iterations, 1); 49 callCount = callCount + 1; 50 }; 51 f().next().then(() => { 52 assert.sameValue(callCount, 1, 'invoked exactly once'); 53 }).then($DONE, $DONE);