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: echo.rs
    path of file: ./repos/may/examples
    
    the code of the file until where you have to start completion: extern crate docopt;
#[macro_use]
extern crate may;
#[macro_use]
extern crate serde_derive;

// use std::time::Duration;
use std::io::{Read, Write};

use docopt::Docopt;
use may::net::{TcpListener
    
fn main() {
    let args: Args = Docopt::new(USAGE)
        .and_then(|d| d.deserialize())
        .unwrap_or_else(|e| e.exit());

    if args.flag_v {
        return println!("echo: {VERSION}");
    }

    let port = args.flag_p;
    let threads = args.flag_t;
    may::config().set_workers(threads);

    may::coroutine::scope(|s| {
        for i in 0..threads {
            go!(s, move || {
                // let listener = TcpListener::bind("127.0.0.1:8080").unwrap();
                let listener = TcpListener::bind(("0.0.0.0", port)).unwrap();

                println!(
                    "Starting tcp echo server on {:?}",
                    listener.local_addr().unwrap(),
                );
                println!("running on thread id {i}");

                for stream in listener.incoming() {
                    match stream {
                        Ok(s) => {
                            go!(move || handle_client(s));
                        }
                        Err(e) => println!("err = {e:?}"),
                    }
                }
            });
        }
    });
}