using System;

Task.Run(async () =>
{
   await Func();

   [System.Runtime.CompilerServices.RuntimeAsyncMethodGeneration(true)]
   static async Task Func()
   {
       await Task.Delay(1);
       await Task.Yield();
   }
});

namespace System.Runtime.CompilerServices
{
    [AttributeUsage(AttributeTargets.Method)]
    internal class RuntimeAsyncMethodGenerationAttribute(bool runtimeAsync) : Attribute
    {
        public bool RuntimeAsync { get; } = runtimeAsync;
    }
}