Function spawn 

pub fn spawn<M, E, Fun, Fut>(
    config: Config,
    fun: Fun,
) -> (Child<E, Channel<M>>, Address<Channel<M>>)
where
    Fun: FnOnce(Inbox<M>) -> Fut + Send + 'static,
    Fut: Future<Output = E> + Send + 'static,
    E: Send + 'static,
    M: Send + 'static,

Spawn a new actor with a single process, this returns a Child and an Address.

Example

let (child, address) =
    spawn(Config::default(), |mut inbox: Inbox<u32>| async move {
        loop {
            let msg = inbox.recv().await;
            println!("Received message: {msg:?}");
        }
    });