async-gen-meth-ary-ptrn-rest-id-elision.js (2555B)
1 // |reftest| async 2 // This file was procedurally generated from the following sources: 3 // - src/dstr-binding/ary-ptrn-rest-id-elision.case 4 // - src/dstr-binding/default/cls-decl-async-gen-meth.template 5 /*--- 6 description: Rest element following elision elements (class expression method) 7 esid: sec-class-definitions-runtime-semantics-evaluation 8 features: [async-iteration] 9 flags: [generated, async] 10 info: | 11 ClassDeclaration : class BindingIdentifier ClassTail 12 13 1. Let className be StringValue of BindingIdentifier. 14 2. Let value be the result of ClassDefinitionEvaluation of ClassTail with 15 argument className. 16 [...] 17 18 14.5.14 Runtime Semantics: ClassDefinitionEvaluation 19 20 21. For each ClassElement m in order from methods 21 a. If IsStatic of m is false, then 22 i. Let status be the result of performing 23 PropertyDefinitionEvaluation for m with arguments proto and 24 false. 25 [...] 26 27 Runtime Semantics: PropertyDefinitionEvaluation 28 29 AsyncGeneratorMethod : 30 async [no LineTerminator here] * PropertyName ( UniqueFormalParameters ) 31 { AsyncGeneratorBody } 32 33 1. Let propKey be the result of evaluating PropertyName. 34 2. ReturnIfAbrupt(propKey). 35 3. If the function code for this AsyncGeneratorMethod is strict mode code, let strict be true. 36 Otherwise let strict be false. 37 4. Let scope be the running execution context's LexicalEnvironment. 38 5. Let closure be ! AsyncGeneratorFunctionCreate(Method, UniqueFormalParameters, 39 AsyncGeneratorBody, scope, strict). 40 [...] 41 42 43 13.3.3.6 Runtime Semantics: IteratorBindingInitialization 44 ArrayBindingPattern : [ Elisionopt BindingRestElement ] 45 1. If Elision is present, then 46 a. Let status be the result of performing 47 IteratorDestructuringAssignmentEvaluation of Elision with 48 iteratorRecord as the argument. 49 b. ReturnIfAbrupt(status). 50 2. Return the result of performing IteratorBindingInitialization for 51 BindingRestElement with iteratorRecord and environment as arguments. 52 ---*/ 53 var values = [1, 2, 3, 4, 5]; 54 55 56 var callCount = 0; 57 class C { 58 async *method([ , , ...x]) { 59 assert(Array.isArray(x)); 60 assert.sameValue(x.length, 3); 61 assert.sameValue(x[0], 3); 62 assert.sameValue(x[1], 4); 63 assert.sameValue(x[2], 5); 64 assert.notSameValue(x, values); 65 callCount = callCount + 1; 66 } 67 }; 68 69 new C().method(values).next().then(() => { 70 assert.sameValue(callCount, 1, 'invoked exactly once'); 71 }).then($DONE, $DONE);