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: tcp-echo.rs
    path of file: ./repos/async-std/examples
    
    the code of the file until where you have to start completion: //! TCP echo server.
//!
//! To send messages, do:
//!
//! ```sh
//! $ nc localhost 8080
//! ```

use async_std::io;
use async_std::net::{TcpListener, TcpStream};
use async_std::prelude::*;
use async_std::task;

async fn process(stream: TcpStream) -> io::Result<()> {
    println!("Accepted from: {}", stream.peer_addr()?);

    let mut reader = stream.clone();
    let mut writer = stream;
    io::copy(&mut reader, &mut 
    
fn main() -> io::Result<()> {
    task::block_on(async {
        let listener = TcpListener::bind("127.0.0.1:8080").await?;
        println!("Listening on {}", listener.local_addr()?);

        let mut incoming = listener.incoming();

        while let Some(stream) = incoming.next().await {
            let stream = stream?;
            task::spawn(async {
                process(stream).await.unwrap();
            });
        }
        Ok(())
    })
}