Language/Generics/Superbounded_types/class_A03_t02.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 AIt 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 a redirecting factory constructor signature
 * @description Checks that compile error is thrown when raw type [T] is used in
 * the redirecting factory constructor signature
 * @Issue 34714,37037,41895
 * @author iarkh@unipro.ru
 */

class A<X> {
  A() {}
  factory A.foo1() = C;
  factory A.foo2() = C<A>;
  //                 ^^^^
  // [analyzer] COMPILE_TIME_ERROR.REDIRECT_TO_INVALID_RETURN_TYPE
  // [cfe] The constructor function type 'C<A<dynamic>> Function()' isn't a subtype of 'A<X> Function()'.
  factory A.foo3() = C<A<A>>;
  //                 ^^^^^^^
  // [analyzer] COMPILE_TIME_ERROR.REDIRECT_TO_INVALID_RETURN_TYPE
  // [cfe] The constructor function type 'C<A<A<dynamic>>> Function()' isn't a subtype of 'A<X> Function()'.
  factory A.foo4() = C<A<A<A>>>;
  //                 ^^^^^^^^^^
  // [analyzer] COMPILE_TIME_ERROR.REDIRECT_TO_INVALID_RETURN_TYPE
  // [cfe] The constructor function type 'C<A<A<A<dynamic>>>> Function()' isn't a subtype of 'A<X> Function()'.
}

class C<X> extends A<X> {
  C() {}
}

main() {}