Observed/Unobserved C# async Exceptions

void Main()
{
    AppDomain.CurrentDomain.FirstChanceException += (object obj, FirstChanceExceptionEventArgs args) => {
        Console.WriteLine ("First chance exception ");
        args.Dump();
    };

    AppDomain.CurrentDomain.UnhandledException += (object obj, UnhandledExceptionEventArgs args) => {
        Console.WriteLine ("Unhandled exception ");
    };

    TaskScheduler.UnobservedTaskException += (object obj, UnobservedTaskExceptionEventArgs args) => {
        Console.WriteLine ("Unobserved exception");
    };

    try
    {
        //DoStuff().Wait(); // Observed
        DoStuff();          // Unobserved - Generates a FirstChanceException and an UnobservedTaskException (after several seconds).
    }
    catch (Exception ex)
    {
        Console.WriteLine ("An Observed task.");
    }
}

async Task DoStuff()
{
    Task t = Task.FromResult(1);

    await t;

    throw new ArgumentException();
}