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: connect.rs
    path of file: ./repos/tokio/examples
    
    the code of the file until where you have to start completion: //! An example of hooking up stdin/stdout to either a TCP or UDP stream.
//!
//! This example will connect to a socket address specified in the argument list
//! and then forward all data read on stdin to the server, printing out all data
//! received on stdout. An optional `
    
async fn main() -> Result<(), Box<dyn Error>> {
    // Determine if we're going to run in TCP or UDP mode
    let mut args = env::args().skip(1).collect::<Vec<_>>();
    let tcp = match args.iter().position(|a| a == "--udp") {
        Some(i) => {
            args.remove(i);
            false
        }
        None => true,
    };

    // Parse what address we're going to connect to
    let addr = args
        .first()
        .ok_or("this program requires at least one argument")?;
    let addr = addr.parse::<SocketAddr>()?;

    let stdin = FramedRead::new(io::stdin(), BytesCodec::new());
    let stdin = stdin.map(|i| i.map(|bytes| bytes.freeze()));
    let stdout = FramedWrite::new(io::stdout(), BytesCodec::new());

    if tcp {
        tcp::connect(&addr, stdin, stdout).await?;
    } else {
        udp::connect(&addr, stdin, stdout).await?;
    }

    Ok(())
}