mcs/errors/cs8178-2.cs

   1 // CS8178: `await' cannot be used in an expression containing a call to `X.this[int]' because it returns by reference
   2 // Line: 12
   3
   4 using System.Threading.Tasks;
   5
   6 class X
   7 {
   8         int x;
   9
  10         async Task Test ()
  11         {
  12                 Foo (ref this [await Task.FromResult (1)]);
  13         }
  14
  15         ref int this [int arg] => ref x;
  16
  17         static void Foo (ref int arg)
  18         {
  19         }
  20 }