// 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
///    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 void Alias1<X extends X>(X);                                 //# 01: compile-time error
typedef void Alias2<X extends Y, Y extends X>(X, Y);                 //# 02: compile-time error
typedef void Alias3<X extends Y, Y extends Z, Z extends X>(X, Y, Z); //# 03: compile-time error

main() {}