Rust: How do you implement a service trait?

1trait Service<Request> {
2    type Response;
3    type Error;
4    type Future: Future<Output = Result<Self::Response, Self::Error>>;
5
6    fn call(&self, req: Request) -> Self::Future;
7}

1struct MyService;
2
3impl Service<Request> for MyService {
4    type Response = Response;
5    type Error = Error;
6    type Future = Pin<Box<dyn Future<Output = Result<Response, Error>>>>;
7
8    fn call(&self, req: Request) -> Self::Future {
9        Box::pin(async move {
10            Ok(Response::new())
11        })
12    }
13}