LanguageFeatures/Primary-constructors/static_processing_A12_t08.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 The semantics of the primary constructor is found in the
/// following steps, where `D` is the class, mixin class, extension type, or
/// enum declaration in the program that includes a primary constructor `k`, and
/// `D2` is the result of the derivation of the semantics of `D`. The derivation
/// step will delete elements that amount to the primary constructor.
/// Semantically, it will add a new constructor `k2`, and it will add zero or
/// more instance variable declarations.
///
/// Where no processing is mentioned below, `D2` is identical to `D`. Changes
/// occur as follows:
///
/// Let `p` be a formal parameter in `k` which has the modifier `var` or the
/// modifier `final` (that is, `p` is a declaring parameter).
///
/// Consider the situation where `p` has no type annotation:
/// ...
/// - otherwise, if `p` does not have a default value then `p` has declared type
///   `Object?`.
///
/// @description Check that in the case of an enum, it is not an error if
/// neither the type nor `final` is specified
/// @author sgrekhov22@gmail.com

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

enum E1(x) {
  e0(0), e1(null), e2('2');
}

enum E2([x]) {
  e0(0), e1(null), e2('2');
}

enum E3({x}) {
  e0(x: 0), e1(x: null), e2(x: '2');
}

enum E4({required x}) {
  e0(x: 0), e1(x: null), e2(x: '2');
}

main() {
  print(E1);
  print(E2);
  print(E3);
  print(E4);
}