mcs/errors/cs0311-4.cs

   1 // CS0311: The type `B<int>' cannot be used as type parameter `X' in the generic type or method `C<X>'. There is no implicit reference conversion from `B<int>' to `D<B<int>>'
   2 // Line: 3
   3 class A : C<B<int>> {}
   4 class B<X> {}
   5 interface C<X> where X : D<X> {}
   6 interface D<X> {}