Language/Functions/Formal_Parameters/Required_Formals/syntax_t10.dart

// Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

// @dart = 2.9

/// @assertion A required formal parameter may be specied in one of three ways:
///
/// • By means of a function signature that names the parameter and describes
///   its type as a function type. It is a compile-time error if any default
///   values are specied in the signature of such a function type.
/// • As an initializing formal, which is only valid as a parameter to a
///   generative constructor.
/// • Via an ordinary variable declaration
///
/// normalFormalParameter:
///   functionSignature |
///   fieldFormalParameter |
///   simpleFormalParameter
/// ;
/// simpleFormalParameter:
///   declaredIdentifier |
///   metadata identifier
/// ;
/// fieldFormalParameter:
///   metadata finalConstVarOrType? this '.' identifier formalParameterList?
/// ;
/// @description Checks that initializing formals are not allowed in library
/// functions.
/// @author ilya
/// @reviewer


f(this.x) {}
//^
// [analyzer] unspecified
// [cfe] unspecified

main() {
  try {
    f(0);
  } catch (e) {}
}