mcs/errors/cs4027.cs

   1 // CS4027: The awaiter type `A' must implement interface `System.Runtime.CompilerServices.INotifyCompletion'
   2 // Line: 33
   3
   4 using System.Threading.Tasks;
   5
   6 static class S
   7 {
   8         public static A GetAwaiter (this int i)
   9         {
  10                 return new A ();
  11         }
  12 }
  13
  14 class A
  15 {
  16         bool IsCompleted {
  17                 get {
  18                         return true;
  19                 }
  20         }
  21
  22         public void OnCompleted (System.Action a)
  23         {
  24         }
  25
  26         int GetResult ()
  27         {
  28                 return 3;
  29         }
  30
  31         static async Task<int> Test1 ()
  32         {
  33                 await 1;
  34         }
  35 }