Language/Generics/Superbounded_types/well_bounded_A02_t01.dart

// Copyright (c) 2019, 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 Any use of a type `T` which is not well-bounded is a
/// compile-time error.
///
/// @description Checks that it is a compile-time error when a function has a
/// type parameter bound which is a raw type that does not have simple bounds,
/// and when a function has a type parameter bound which is malbounded.
/// @author iarkh@unipro.ru

class A<T extends A<T>> {}

// Here the function is a well-bounded but the bound is a raw type A<A<dynamic>>
// that doesn't have simple bounds
void testme1<X extends A>() {}
//           ^
// [cfe] Generic type 'A' can't be used without type arguments in a type variable bound.
//                     ^
// [analyzer] COMPILE_TIME_ERROR.NOT_INSTANTIATED_BOUND

// Same here, the function is a well-bounded but the bound is a raw type without
// simple bound
void testme2<X extends A<A>>() {}
//           ^
// [cfe] Generic type 'A' can't be used without type arguments in a type variable bound.
//                       ^
// [analyzer] COMPILE_TIME_ERROR.NOT_INSTANTIATED_BOUND


void testme3<X extends A<int>>() {} // A<int> is a  malbounded type
//                     ^
// [cfe] Type argument 'int' doesn't conform to the bound 'A<T>' of the type variable 'T' on 'A'.
//                       ^^^
// [analyzer] COMPILE_TIME_ERROR.TYPE_ARGUMENT_NOT_MATCHING_BOUNDS

main() {
  print(testme1);
  print(testme2);
  print(testme3);
}