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