LanguageFeatures/Augmentations/augmenting_constructors_A10_t22.dart

// Copyright (c) 2026, 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.

/// @assertion We say that an augmenting function or constructor's signature
/// matches an introductory signature if:
/// - It has the same number of type parameters with the same type parameter
///   names (same identifiers) and bounds (after type annotation inheritance),
///   if any (same types, even if they may not be written exactly the same in
///   case one of the declarations needs to refer to a type using an import
///   prefix).
/// - The return type (if not omitted) is the same as the introductory
///   declaration's return type.
/// - It has the same number of positional parameters as the introductory
///   declaration, and the same number of those are optional.
/// - It has the same set of named parameter names as the introductory
///   declaration.
/// - For each corresponding pair of parameters:
///   - They have the same name. This is trivial for named parameters, but may
///     fail to hold for positional parameters.
///   - They have the same type (or the augmenting declaration omits the type).
///   - They both have the modifier `covariant`, or none of them have it.
///   - They both have the modifier `required`, or none of them have it.
/// ...
/// It is a compile-time error if:
/// - The signature of the augmenting constructor does not match the signature
///   of the corresponding introductory constructor.
///
/// @description Checks that it is a compile-time error if the name of a
/// positional formal parameter of an augmenting primary constructor is not the
/// same as the name of the corresponding positional parameter.
/// @author sgrekhov22@gmail.com

// SharedOptions=--enable-experiment=augmentations,primary-constructors

class C1(int? x) {}

augment class C1 {
  augment C1(int? _);
//                ^
// [analyzer] unspecified
// [cfe] unspecified
}

class C2([int? _]) {}

augment class C2 {
  augment C2([int? x]);
//                 ^
// [analyzer] unspecified
// [cfe] unspecified
}

enum E1(int _) {
  e0(0);
}

augment enum E1 {
  ;
  augment const E1(int x);
//                     ^
// [analyzer] unspecified
// [cfe] unspecified
}

enum E2([int? x]) {
  e0;
}

augment enum E2 {
  ;
  augment const E2([int? _]);
//                       ^
// [analyzer] unspecified
// [cfe] unspecified
}

main() {
  print(C1);
  print(C2);
  print(E1);
  print(E2);
}