named-ary-ptrn-elem-obj-prop-id-init.js (1754B)
1 // |reftest| async 2 // This file was procedurally generated from the following sources: 3 // - src/dstr-binding/ary-ptrn-elem-obj-prop-id-init.case 4 // - src/dstr-binding/default/async-gen-func-named-expr.template 5 /*--- 6 description: BindingElement with object binding pattern and initializer is used (async generator named function expression) 7 esid: sec-asyncgenerator-definitions-evaluation 8 features: [async-iteration] 9 flags: [generated, async] 10 info: | 11 AsyncGeneratorExpression : async [no LineTerminator here] function * BindingIdentifier 12 ( FormalParameters ) { AsyncGeneratorBody } 13 14 [...] 15 7. Let closure be ! AsyncGeneratorFunctionCreate(Normal, FormalParameters, 16 AsyncGeneratorBody, funcEnv, strict). 17 [...] 18 19 20 13.3.3.6 Runtime Semantics: IteratorBindingInitialization 21 22 BindingElement : BindingPatternInitializer opt 23 24 [...] 25 2. If iteratorRecord.[[done]] is true, let v be undefined. 26 3. If Initializer is present and v is undefined, then 27 a. Let defaultValue be the result of evaluating Initializer. 28 b. Let v be ? GetValue(defaultValue). 29 4. Return the result of performing BindingInitialization of BindingPattern 30 with v and environment as the arguments. 31 ---*/ 32 33 34 var callCount = 0; 35 var f; 36 f = async function* h([{ u: v, w: x, y: z } = { u: 444, w: 555, y: 666 }]) { 37 assert.sameValue(v, 444); 38 assert.sameValue(x, 555); 39 assert.sameValue(z, 666); 40 41 assert.throws(ReferenceError, function() { 42 u; 43 }); 44 assert.throws(ReferenceError, function() { 45 w; 46 }); 47 assert.throws(ReferenceError, function() { 48 y; 49 }); 50 callCount = callCount + 1; 51 }; 52 53 f([]).next().then(() => { 54 assert.sameValue(callCount, 1, 'invoked exactly once'); 55 }).then($DONE, $DONE);