errors/cs0023-11.cs

   1 // cs0023: The `-' operator cannot be applied to operand of type `A'
   2 // Line: 16
   3
   4
   5 class A
   6 {
   7         public static implicit operator ulong (A mask)
   8         {
   9                 return 8;
  10         }
  11 }
  12
  13 class X
  14 {
  15     static A a = null;
  16     static object o = -a;
  17 }