LanguageFeatures/Primary-constructors/static_processing_A07_t03.dart

// Copyright (c) 2025, 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 The following errors apply to formal parameters of a primary
/// constructor. Let `p` be a formal parameter of a primary constructor in a
/// class, mixin class, enum, or extension type declaration `D` named `C`:
///
/// A compile-time error occurs if `p` has the modifier covariant, but not `var`.
///
/// @description Check that it is a compile-time error if a formal parameter of
/// a primary constructor contains a term of the form `this.v` and has the
/// modifier `covariant`. Test extension types.
/// @author sgrekhov22@gmail.com

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

extension type ET1(covariant String this.x) {
//             ^^^
// [analyzer] unspecified
// [cfe] unspecified
}

extension type ET2([covariant String this.x = ""]) {
//             ^^^
// [analyzer] unspecified
// [cfe] unspecified
}

extension type ET3({covariant String this.x = ""}) {
//             ^^^
// [analyzer] unspecified
// [cfe] unspecified
}

extension type ET4({required covariant String this.x}) {
//             ^^^
// [analyzer] unspecified
// [cfe] unspecified
}

main() {
  print(ET1);
  print(ET2);
  print(ET3);
  print(ET4);
}