mcs/errors/cs1956.cs

   1 // CS1956: The interface method `I<string>.M(out string)' implementation is ambiguous between following methods: `A<string,string>.M(out string)' and `A<string,string>.M(ref string)' in type `Test'
   2 // Line: 17
   3 // Compiler options: -warnaserror
   4
   5 interface I<T>
   6 {
   7         void M (out T x);
   8 }
   9
  10 class A<T, U>
  11 {
  12         public virtual void M (out T t)
  13         {
  14                 t = default (T);
  15         }
  16
  17         public virtual void M (ref U u)
  18         {
  19         }
  20 }
  21
  22 class Test : A<string, string>, I<string>
  23 {
  24         static void Main ()
  25         {
  26                 I<string> x = new Test ();
  27                 string s;
  28                 x.M (out y);
  29         }
  30 }