using System;

using System.Threading.Tasks;

public class Program

{

    public static async void Main()

    {

        var ret = await Hoge();

        if (ret == null)

        {

            Console.WriteLine("null!");

        }

        else

        {

            Console.WriteLine("not null!");

        }

    }

    private static async Task<object> Hoge()

    {

        return null;

        //return 1;

    }

}