blob: c6a62089a5353e9ab58fec025e9491b904202702 [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);
// [error line 24, column 0]
// [analyzer] unspecified
// [cfe] unspecified
typedef void Alias3<X extends Y, Y extends Z, Z extends X>(X, Y, Z);
// [error line 28, column 0]
// [analyzer] unspecified
// [cfe] unspecified
main() {}