mcs/errors/cs4015.cs

   1 // CS4015: `C.SynchronousCall(int)': Async methods cannot use `MethodImplOptions.Synchronized'
   2 // Line: 9
   3
   4 using System.Threading.Tasks;
   5 using System.Runtime.CompilerServices;
   6
   7 class C
   8 {
   9         [MethodImplAttribute(MethodImplOptions.Synchronized)]
  10         public static async Task SynchronousCall (int arg)
  11         {
  12                 await Task.FromResult (1);
  13         }
  14 }