mcs/errors/cs1503-18.cs

   1 // CS1503: Argument `#1' cannot convert `int?' expression to type `System.Index'
   2 // Line: 11
   3
   4 class X
   5 {
   6         public static void Main ()
   7         {
   8                 string x = null;
   9                 string y = null;
  10
  11                 var res = x?[y?.Length];
  12         }
  13 }