Is there a way to start both a tonic gRPC and an actix web app within the same main?

Question

I am trying to implement a server that serves both gRPC and REST calls and that is started by a single binary.

In this main function, I am trying to start a tonic gRPC server and an actix-web REST API.

I found this answer but it didn't work for me: Using Actix from a Tokio App: mixing actix_web::main and tokio::main?

Tonic uses #[tokio::main] while actix uses #[actix_web::main].

I ran cargo expand over the two main functions and got the following:

• #[tokio::main]

fn main() -> Result<(), Box<dyn std::error::Error>> {
    tokio::runtime::Builder::new_multi_thread()
        .enable_all()
        .build()
        .expect("Failed building the Runtime")
        .block_on(async {
            # my code goes here
        })
}

• #[actix_web::main]

fn main() -> Result<(), Box<dyn std::error::Error>> {
    actix_web::rt::System::new("main").block_on(async move {
        {
            # my code goes here
        }
    })
}

I tried following the code in this discussion: https://github.com/actix/actix-web/issues/1283 where they use this code:

#[tokio::main]
async fn main() -> std::io::Result<()>{
    let local = tokio::task::LocalSet::new();
    let sys = actix_web::rt::System::run_in_tokio("server", &local);
    let server_res = HttpServer::new(|| App::new().route("/", web::get().to(hello_world)))
        .bind("0.0.0.0:8000")?
        .run()
        .await?;
    sys.await?;
    Ok(server_res)
}

but I get a compilation error saying that `expected struct tokio::task::local::LocalSet, found struct LocalSet and I don't know how to proceed.

I am quite new to Rust so any suggestion is appreciated.