Language/Generics/Superbounded_types/class_A04_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.

// @dart = 2.9

/// @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
/// as an element in the type list of an [implements] clause
/// @author iarkh@unipro.ru


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

class B1 implements A {}             //# 01: compile-time error
class B2<X extends A<X>> implements A<X> {}

class B3 implements A<dynamic> {}    //# 02: compile-time error
class B4 implements A<Object> {}     //# 03: compile-time error
class B5 implements A<void> {}       //# 04: compile-time error
class B6 implements A<Null> {}

class B7 implements A<A<dynamic>> {} //# 05: compile-time error
class B8 implements A<A<Object>> {}  //# 06: compile-time error
class B9 implements A<A<void>> {}    //# 07: compile-time error
class B10 implements A<A<Null>> {}

main() {}