using System;
using System.Threading;
using System.Threading.Tasks;

internal static class Program
{
    private static async System.Threading.Tasks.Task Main(string[] args)
    {
        using var source = new CancellationTokenSource();
        source.Cancel();
        try { await Task.Delay(10, source.Token); }
        catch (OperationCanceledException) when (source.IsCancellationRequested)
        {
            Console.WriteLine("Request cancelled");
        }
    }
}