// |reftest| error:SyntaxError
// This file was procedurally generated from the following sources:
// - src/function-forms/dflt-params-duplicates.case
// - src/function-forms/syntax/async-func-decl.template
/*---
description: It is a Syntax Error if BoundNames of FormalParameters contains any duplicate elements. (async function declaration)
esid: sec-async-function-definitions
features: [default-parameters, async-functions]
flags: [generated]
negative:
  phase: parse
  type: SyntaxError
info: |
    14.6 Async Function Definitions

    AsyncFunctionDeclaration :
      async function BindingIdentifier ( FormalParameters ) { AsyncFunctionBody }


    14.1.2 Static Semantics: Early Errors

    StrictFormalParameters : FormalParameters

    - It is a Syntax Error if BoundNames of FormalParameters contains any
      duplicate elements.

    FormalParameters : FormalParameterList

    - It is a Syntax Error if IsSimpleParameterList of FormalParameterList is
      false and BoundNames of FormalParameterList contains any duplicate
      elements.

---*/
$DONOTEVALUATE();


async function f(x = 0, x) {
  
}