assignability_A01_t02.dart

// Copyright (c) 2020, 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 A type T is assignable to a type S if T is dynamic, or if T is a
/// subtype of S.
///
/// @description Checks that if type T is not dynamic and T is a subtype of S
/// then a type T is not assignable to a type S
///
/// @author sgrekhov@unipro.ru

class A {}
class B extends A {}
class C extends A {}

main() {
  B b1 = new A();
//       ^^^^^^^
// [analyzer] unspecified
// [cfe] unspecified
  B b2 = new C();
//       ^^^^^^^
// [analyzer] unspecified
// [cfe] unspecified

  B? b3 = new A();
//        ^^^^^^^
// [analyzer] unspecified
// [cfe] unspecified

  B? b4 = new C();
//        ^^^^^^^
// [analyzer] unspecified
// [cfe] unspecified
}