dflt-obj-ptrn-prop-ary.js (1443B)
1 // |reftest| async 2 // This file was procedurally generated from the following sources: 3 // - src/dstr-binding/obj-ptrn-prop-ary.case 4 // - src/dstr-binding/default/async-gen-func-decl-dflt.template 5 /*--- 6 description: Object binding pattern with "nested" array binding pattern not using initializer (async generator function declaration (default parameter)) 7 esid: sec-asyncgenerator-definitions-instantiatefunctionobject 8 features: [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 13.3.3.7 Runtime Semantics: KeyedBindingInitialization 21 22 [...] 23 3. If Initializer is present and v is undefined, then 24 [...] 25 4. Return the result of performing BindingInitialization for BindingPattern 26 passing v and environment as arguments. 27 ---*/ 28 29 30 var callCount = 0; 31 async function* f({ w: [x, y, z] = [4, 5, 6] } = { w: [7, undefined, ] }) { 32 assert.sameValue(x, 7); 33 assert.sameValue(y, undefined); 34 assert.sameValue(z, undefined); 35 36 assert.throws(ReferenceError, function() { 37 w; 38 }); 39 callCount = callCount + 1; 40 }; 41 f().next().then(() => { 42 assert.sameValue(callCount, 1, 'invoked exactly once'); 43 }).then($DONE, $DONE);