/*
 * 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
 *    typeParameter ::= metadata identifier (extends typeNotVoid)?
 *    typeParameters ::= ‘<’ typeParameter (‘,’ typeParameter)* ‘>’
 * ...
 * It is a compile-time error if a type parameter is a supertype of its upper
 * bound when that upper bound is itself a type variable.
 * This prevents circular declarations like [X extends X] and [X extends Y, Y
 * extends X].
 * @description Checks that it is a compile error if typedef type variable is a
 * supertype of its upper bound.
 * @author iarkh@unipro.ru
 */

typedef Alias1<X extends X> = void Function(X);
//             ^^^^^^^^^^^
// [analyzer] COMPILE_TIME_ERROR.TYPE_PARAMETER_SUPERTYPE_OF_ITS_BOUND
// [cfe] Type 'X' can't use itself as a bound.
typedef Alias2<X extends Y, Y extends X> = void Function(X, Y);
// [error line 24, column 0]
// [analyzer] unspecified
// [cfe] unspecified
typedef Alias3<X extends Y, Y extends Z, Z extends X> = void Function(X, Y, Z);
// [error line 28, column 0]
// [analyzer] unspecified
// [cfe] unspecified

main() {}