cargo.toml

[package]
xxxx

[dependencies]
actix = "0.10.0-alpha.3"
actix-cors = "0.3.0-alpha.1"
actix-http = "2.0.0-beta.3"
actix-rt = "1"
actix-service = "1.0.6"
actix-web = { version = "3.0.0-beta.3", features = ["rustls"] }
log = "0.4"
actix_derive = "0.5"

error.txt

Cargo check Error


error: Expect a attribute `rtype`
 --> chat-worker/src/worker.rs:7:10
  |
7 | #[derive(Message)]
  |          ^^^^^^^
  |
  = note: this error originates in a derive macro (in Nightly builds, run with -Z macro-backtrace for more info)

error[E0277]: the trait bound `worker::BackgroundTask: actix::Message` is not satisfied
  --> chat-worker/src/worker.rs:21:6
   |
21 | impl Handler<BackgroundTask> for BackgroundTaskActor {
   |      ^^^^^^^^^^^^^^^^^^^^^^^ the trait `actix::Message` is not implemented for `worker::BackgroundTask`
   |
  ::: /Users/angel/.cargo/registry/src/github.com-1ecc6299db9ec823/actix-0.10.0-alpha.3/src/handler.rs:23:8
   |
23 |     M: Message,
   |        ------- required by this bound in `actix::Handler`

error: aborting due to 2 previous errors

For more information about this error, try `rustc --explain E0277`.
error: could not compile `chat-worker`.

lib.rs

#[macro_use]
extern crate log;

extern crate actix;
pub mod worker;

worker.rs

use actix::prelude::*;
use actix::Actor;
use std::{thread, time};

#[derive(Message)] // COMPILE ERROR: Here..
pub struct BackgroundTask;

#[derive(Default)]
pub struct BackgroundTaskActor;

impl Actor for BackgroundTaskActor {
    type Context = SyncContext<Self>;

    fn started(&mut self, _: &mut SyncContext<Self>) {
        info!("Background task actor started up")
    }
}

impl Handler<BackgroundTask> for BackgroundTaskActor { // COMPILE ERROR: Here..
    type Result = ();

    fn handle(&mut self, _: BackgroundTask, _: &mut SyncContext<Self>) {
        info!("Starting background task");
        thread::sleep(time::Duration::new(4, 0));
        info!("Finished background task");
    }
}