mcs/errors/cs0455-4.cs

   1 // CS0455: Type parameter `Y' inherits conflicting constraints `long' and `long?'
   2 // Line: 11
   3
   4 abstract class A<T1, T2>
   5 {
   6         public abstract void Foo<U> () where U : T1, T2;
   7 }
   8
   9 class B : A<long, long?>
  10 {
  11         public override void Foo<Y> ()
  12         {
  13         }
  14 }