mcs/errors/cs0023-19.cs

   1 // CS0023: The `!' operator cannot be applied to operand of type `int?'
   2 // Line: 9
   3
   4 class Z
   5 {
   6         public static void Main ()
   7         {
   8                 int? n = null;
   9                 var m = !n;
  10         }
  11 }