FTP in Rust

main.rs

extern crate ftp;

use ftp::FtpStream;
use std::fs::File;
use std::error::Error;
use std::io;

fn main() {
    let result = download("example.com:21", "anonymous", "anonymous", ".", "Test.txt");
    match result {
        Ok(bytes_written) => println!("Wrote {} bytes", bytes_written),
        Err(error) => println!("Error occurred: {}", error)
    }
}

fn download(addr: &str, username: &str, password: &str, dir: &str, file: &str) -> Result<u64, Box<Error>> {
    let mut stream = FtpStream::connect(addr)?;
    stream.login(username, password)?;
    stream.cwd(dir)?;

    println!("Current directory: {}", stream.pwd()?);
    for file in stream.list(None)? {
        println!("{}", file);
    }

    Ok(io::copy(&mut stream.get(file)?, &mut File::create(file)?)?)
}