blob: b44689fe03ca7e3f70ca0e359eed7f9f31a6b920 [file] [log] [blame]
// 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
typedef void Alias1<X extends X>(X);
// ^^^^^^^^^^^
// [cfe] Type 'X' can't use itself as a bound.
typedef void Alias2<X extends Y, Y extends X>(X, Y);
// ^^^^^^^^^^^
// [analyzer] unspecified
// [cfe] unspecified
typedef void Alias3<X extends Y, Y extends Z, Z extends X>(X, Y, Z);
// ^^^^^^^^^^^
// [analyzer] unspecified
// [cfe] unspecified
main() {}