a.rs

use actix::prelude::*;

pub struct Msg {
}

impl Message for Msg {
    type Result = ();
}

pub struct AsyncActorThatOnlySpewsState {
    pub internal_state: i32,
}

impl Actor for AsyncActorThatOnlySpewsState {
    type Context = Context<Self>;
}

impl Handler<Msg> for AsyncActorThatOnlySpewsState {
    type Result = ResponseFuture<i32>;

    fn handle(&mut self, msg: Msg, _ctx: &mut Context<Self>) -> Self::Result {
        Box::pin(async move {
            self.internal_state
        })
    }
}