You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: server.rs
    path of file: ./repos/Rust-Full-Stack/gRPC/rust/tonic/src/helloworld
    
    the code of the file until where you have to start completion: use tonic::{transport::Server, Request, Response, Status};

pub mod hello_world {
    tonic::include_proto!("helloworld");
}

use hello_world::{
   
    
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    let addr = "[::1]:50051".parse().unwrap();
    let greeter = MyGreeter::default();

    Server::builder()
        .serve(addr, GreeterServer::new(greeter))
        .await?;

    Ok(())
}