errors/gcs1961-38.cs

   1 // CS1961: The covariant type parameter `V' must be invariantly valid on `Both<U,V>(Covariant<None<Contra<V>>>)'
   2 // Line: 9
   3 // Compiler options: -langversion:future
   4
   5 delegate T Covariant<out T> ();
   6 delegate void Contra<in T> (T t);
   7 delegate void None<T> (T t);
   8
   9 delegate void Both<in U, out V> (Covariant<None<Contra<V>>> b);