Language/Generics/Superbounded_types/class_A04_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 It is a compile-time error if a parameterized type [T] is
 * super-bounded when it is used in any of the following ways:
 * ...
 * [T] is an immediate subterm of an [extends] clause of a class (10.8), or it
 * occurs as an element in the type list of an [implements] clause (10.9), or a
 * [with] clause (10).
 * @description Checks that exception is thrown if super-bounded class occurs in
 * an immediate subterm of the [extends] clause.
 * @author iarkh@unipro.ru
 */

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

class B1 extends A {}
//    ^
// [cfe] Inferred type argument 'A<dynamic>' doesn't conform to the bound 'A<T>' of the type variable 'T' on 'A' in the supertype 'A' of class 'B1'.
//               ^
// [analyzer] COMPILE_TIME_ERROR.TYPE_ARGUMENT_NOT_MATCHING_BOUNDS
class B2<X extends A<X>> extends A<X> {}

class B3 extends A<dynamic> {}
//    ^
// [cfe] Type argument 'dynamic' doesn't conform to the bound 'A<T>' of the type variable 'T' on 'A' in the supertype 'A' of class 'B3'.
//                 ^^^^^^^
// [analyzer] COMPILE_TIME_ERROR.TYPE_ARGUMENT_NOT_MATCHING_BOUNDS
class B4 extends A<Object?> {}
//    ^
// [cfe] Type argument 'Object?' doesn't conform to the bound 'A<T>' of the type variable 'T' on 'A' in the supertype 'A' of class 'B4'.
//                 ^^^^^^^
// [analyzer] COMPILE_TIME_ERROR.TYPE_ARGUMENT_NOT_MATCHING_BOUNDS
class B5 extends A<void> {}
//    ^
// [cfe] Type argument 'void' doesn't conform to the bound 'A<T>' of the type variable 'T' on 'A' in the supertype 'A' of class 'B5'.
//                 ^^^^
// [analyzer] COMPILE_TIME_ERROR.TYPE_ARGUMENT_NOT_MATCHING_BOUNDS
class B6 extends A<Null> {}
//    ^
// [cfe] Type argument 'Null' doesn't conform to the bound 'A<T>' of the type variable 'T' on 'A' in the supertype 'A' of class 'B6'.
//                 ^^^^
// [analyzer] COMPILE_TIME_ERROR.TYPE_ARGUMENT_NOT_MATCHING_BOUNDS

class B7 extends A<A<dynamic>> {}
//    ^
// [cfe] Type argument 'A<dynamic>' doesn't conform to the bound 'A<T>' of the type variable 'T' on 'A' in the supertype 'A' of class 'B7'.
//                 ^^^^^^^^^^
// [analyzer] COMPILE_TIME_ERROR.TYPE_ARGUMENT_NOT_MATCHING_BOUNDS
class B8 extends A<A<Object?>> {}
//    ^
// [cfe] Type argument 'A<Object?>' doesn't conform to the bound 'A<T>' of the type variable 'T' on 'A' in the supertype 'A' of class 'B8'.
//                 ^^^^^^^^^^
// [analyzer] COMPILE_TIME_ERROR.TYPE_ARGUMENT_NOT_MATCHING_BOUNDS
class B9 extends A<A<void>> {}
//    ^
// [cfe] Type argument 'A<void>' doesn't conform to the bound 'A<T>' of the type variable 'T' on 'A' in the supertype 'A' of class 'B9'.
//                 ^^^^^^^
// [analyzer] COMPILE_TIME_ERROR.TYPE_ARGUMENT_NOT_MATCHING_BOUNDS
class B10 extends A<A<Null>> {}
//                  ^^^^^^^
// [analyzer] unspecified
// [cfe] unspecified

class B11 extends A<Never> {}
class B12 extends A<A<Never>> {}

main() {}