using System;

using System.Linq;

using System.Collections.Generic;

using System.Threading.Tasks;

​

public partial class @class {

    private IEnumerable<string> partial() {

        var var = $"{nameof(async)}";

        var yield = var;

        yield return yield;

    }

    public async Task<string> async(){

        return await Task.Run(() => partial().First());

    }

    public async Task await() {

        var partial = await async();

        Console.WriteLine(partial);

    }

}

​

​

public class Program

{

    public static void Main()

    {

        var @class = new @class();

        @class.await().Wait();

    }

}