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: quic_async_client_hello_callback_client.rs
    path of file: ./repos/s2n-quic/examples/async-client-hello-callback/src/bin
    
    the code of the file until where you have to start completion: // Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0

use s2n_quic::{client::Connect, Client};
use std::{error::Error, net::SocketAddr};

/// NOTE: this certificate is to be used for demonstration purposes only!
pub static CERT_PEM: &str = include_str!(concat!(
    env!("CARGO_MANIFEST_DIR"),
    "/../../quic/s2n-quic-core/certs/cert.pem"
));

#[tokio::main]
async fn main() -> Result<(), Box<dyn Error>> {
    let client = Client::builder()
        .with_tls(CERT_PEM)?
        .with_io("0.0.0.0:0")?
        .start()?;

    let addr: SocketAddr = "127.0.0.1:4433".parse()?;
    let connect = Connect::new(addr).with_server_name("localhost");
    let mut connection = client.connect(connect).await?;

    // ensure the connection doesn't time out with inactivity
    connection.keep_alive(true)?;

    /
    
async fn main() -> Result<(), Box<dyn Error>> {
    let client = Client::builder()
        .with_tls(CERT_PEM)?
        .with_io("0.0.0.0:0")?
        .start()?;

    let addr: SocketAddr = "127.0.0.1:4433".parse()?;
    let connect = Connect::new(addr).with_server_name("localhost");
    let mut connection = client.connect(connect).await?;

    // ensure the connection doesn't time out with inactivity
    connection.keep_alive(true)?;

    // open a new stream and split the receiving and sending sides
    let stream = connection.open_bidirectional_stream().await?;
    let (mut receive_stream, mut send_stream) = stream.split();

    // spawn a task that copies responses from the server to stdout
    tokio::spawn(async move {
        let mut stdout = tokio::io::stdout();
        let _ = tokio::io::copy(&mut receive_stream, &mut stdout).await;
    });

    // copy data from stdin and send it to the server
    let mut stdin = tokio::io::stdin();
    tokio::io::copy(&mut stdin, &mut send_stream).await?;

    Ok(())
}