// This file was procedurally generated from the following sources: // - src/function-forms/dflt-params-ref-prior.case // - src/function-forms/default/async-arrow-function.template /*--- description: Referencing a parameter that occurs earlier in the ParameterList (async arrow function expression) esid: sec-async-arrow-function-definitions features: [default-parameters] flags: [generated, async] info: | 14.7 Async Arrow Function Definitions AsyncArrowFunction : ... CoverCallExpressionAndAsyncArrowHead => AsyncConciseBody AsyncConciseBody : { AsyncFunctionBody } ... Supplemental Syntax When processing an instance of the production AsyncArrowFunction : CoverCallExpressionAndAsyncArrowHead => AsyncConciseBody the interpretation of CoverCallExpressionAndAsyncArrowHead is refined using the following grammar: AsyncArrowHead : async ArrowFormalParameters 14.1.19 Runtime Semantics: IteratorBindingInitialization FormalsList : FormalsList , FormalParameter 1. Let status be the result of performing IteratorBindingInitialization for FormalsList using iteratorRecord and environment as the arguments. 2. ReturnIfAbrupt(status). 3. Return the result of performing IteratorBindingInitialization for FormalParameter using iteratorRecord and environment as the arguments. ---*/ var x = 0; var callCount = 0; // Stores a reference `ref` for case evaluation var ref = async (x, y = x, z = y) => { assert.sameValue(x, 3, 'first argument value'); assert.sameValue(y, 3, 'second argument value'); assert.sameValue(z, 3, 'third argument value'); callCount = callCount + 1; }; ref(3).then(() => { assert.sameValue(callCount, 1, 'async arrow function invoked exactly once') }).then($DONE, $DONE);