[2.0.0-beta6.25358.103] .UseHost(…) makes using asynchronous actions mandatory

[springcomp]

I have the following program which works fine:

public sealed class Dependency
{
    public string GetName() => "Dependency Injection Example";

    public static int Main(string[] args)
    {
        var helloCommand = new Command("hello");
        helloCommand.SetAction((parseResult) => { System.Console.WriteLine("greetings!"); });

        var rootCommand = new RootCommand();
        rootCommand.Subcommands.Add(helloCommand);

        var configuration = new CommandLineConfiguration(rootCommand)
            //.UseHost((hostBuilder) =>
            //{
            //    hostBuilder.ConfigureServices((context, services) =>
            //    {
            //        services.AddSingleton<Dependency>();
            //    });
            //})
            ;
        return configuration.Invoke(args);
    }
}

You can see that the .UseHost(…) call is commented out.
In that case, the action that is associated with the helloCommand is typed AnonymousSynchronousCommandLineAction.

If you un-comment the .UseHost(…) call, the program crashes:

Unhandled exception. System.InvalidCastException: Unable to cast object of type 'System.CommandLine.Invocation.AnonymousSynchronousCommandLineAction' to type 'System.CommandLine.Invocation.AsynchronousCommandLineAction'.
at System.CommandLine.Hosting.HostingAction.SetHandlers(Command command, Func2 hostBuilderFactory, Action1 configureHost)
at System.CommandLine.Hosting.HostingAction.SetHandlers(Command command, Func2 hostBuilderFactory, Action1 configureHost)
at System.CommandLine.Hosting.HostingExtensions.UseHost(CommandLineConfiguration config, Func2 hostBuilderFactory, Action1 configureHost)
at System.CommandLine.Hosting.HostingExtensions.UseHost(CommandLineConfiguration config, Action`1 configureHost)
at Dependency.Main(String[] args) in C:\Projects\springcomp\apim\cli\src\apim\Runner.cs:line 52

[springcomp]

This can be solved with the following code change:

-        helloCommand.SetAction(parseResult => System.Console.WriteLine("greetings!"));
+        helloCommand.SetAction((parseResult, cancellationToken) => { System.Console.WriteLine("greetings!"); return Task.FromResult(0); });