pkg/front_end/testcases/instantiate_to_bound/dependence.dart

// Copyright (c) 2018, 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
// This test checks that covariant and contravariant occurrences of the same
// type variable in the bounds of the other type variables from the same
// declaration that are not being transitively depended on by that variable are
// replaced with the bound of that variable and Null respectively.

class A<X> {}

class C<X, Y extends X Function(X)> {}

C c;

class D<X extends num, Y extends X Function(X)> {}

D d;

main() {}