blob: 2894829fe56f849ea050ae1285e8f080d5683c11 [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 A generic type alias is a declaration [D] of one of the following
/// forms:
/// m typedef id<X1 extends B1, . . . , Xs extends Bs> = T;
/// ...
/// [D] introduces a mapping from actual type argument lists to types.
/// @description Checks that [D] maps argument list to types when [T] represents
/// some function
/// @author
import "../../Utils/expect.dart";
class X {}
class Y extends X {}
T checkme1<T>(T t) { throw "Should not be here"; }
X checkme2<T extends X>(X x) { throw "Should not be here"; }
Y checkme3<T extends Y>(Y y) { throw "Should not be here"; }
typedef Func1<T> = T1 Function<T1 extends T>(T1 t);
typedef Func2<T extends X> = T Function<T1 extends T>(T t);
typedef Func3<T extends Y> = T Function<T1 extends T>(T t);
main() {
Expect.isTrue(checkme1 is Func1);
Expect.isFalse(checkme1 is Func2);
Expect.isFalse(checkme1 is Func3);
Expect.isFalse(checkme2 is Func1);
Expect.isTrue(checkme2 is Func2);
Expect.isFalse(checkme2 is Func3);
Expect.isFalse(checkme3 is Func1);
Expect.isFalse(checkme3 is Func2);
Expect.isTrue(checkme3 is Func3);
Expect.isTrue(checkme3 is Func2<Y>);