using System;

using System.Threading;

using System.Threading.Tasks;

using System.Collections.Generic;

​

public static class Program

{

    public static void Main()

    {

        var token = new CancellationToken(true);

        var cachedTask = Cancelled(token);

        var workers = new List<Task>();

        workers.Add(Task.Run(async () =>

        {

            try { await new ValueTask(cachedTask); } catch (Exception ex) { Console.WriteLine(ex.ToString() + "\r\n"); }

        }));

        workers.Add(Task.Run(async () =>

        {

            try { await new ValueTask(cachedTask); } catch (Exception ex) { Console.WriteLine(ex.ToString() + "\r\n"); }

        }));

        workers.Add(Task.Run(async () =>

        {

            try { await new ValueTask(cachedTask); } catch (Exception ex) { Console.WriteLine(ex.ToString() + "\r\n"); }

        }));

        workers.Add(Task.Run(async () =>

        {

            try { await new ValueTask(cachedTask); } catch (Exception ex) { Console.WriteLine(ex.ToString() + "\r\n"); }

        }));

        workers.Add(Task.Run(async () =>

        {

            try { await new ValueTask(cachedTask); } catch (Exception ex) { Console.WriteLine(ex.ToString() + "\r\n"); }

        }));

        workers.Add(Task.Run(async () =>

        {

            try { await new ValueTask(cachedTask); } catch (Exception ex) { Console.WriteLine(ex.ToString() + "\r\n"); }

        }));

        workers.Add(Task.Run(async () =>

        {

            try { await new ValueTask(cachedTask); } catch (Exception ex) { Console.WriteLine(ex.ToString() + "\r\n"); }

        }));

        workers.Add(Task.Run(async () =>

        {

            try { await new ValueTask(cachedTask); } catch (Exception ex) { Console.WriteLine(ex.ToString() + "\r\n"); }

        }));

        workers.Add(Task.Run(async () =>

        {

            try { await new ValueTask(cachedTask); } catch (Exception ex) { Console.WriteLine(ex.ToString() + "\r\n"); }

        }));

        workers.Add(Task.Run(async () =>

        {

            try { await new ValueTask(cachedTask); } catch (Exception ex) { Console.WriteLine(ex.ToString() + "\r\n"); }

        }));

        Task.WaitAll(workers.ToArray());

​

#pragma warning disable CS1998

        static async Task<int> Cancelled(CancellationToken token)

#pragma warning restore CS1998

        {

            token.ThrowIfCancellationRequested();

            return 0; 

        }

    }

}

​