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: main.rs
    path of file: ./repos/rivet/infra/default-builds/dockerfiles/test-mm-lobby-echo/src
    
    the code of the file until where you have to start completion: use anyhow::{Context, Result};
use std::{convert::Infallible, env, net::SocketAddr, process::Command};
use tokio::{
	io::{AsyncBufReadExt, AsyncWriteExt},
	net::{TcpListener, UdpSocket},
};

#[tokio::main]
async fn main() -> Result<()> {
	// Env
	let envs: Vec<(String, Str
    
async fn echo_udp_server(port: u16) -> Result<()> {
	let addr = SocketAddr::from(([0, 0, 0, 0], port));
	println!("UDP: {}", port);

	let socket = UdpSocket::bind(&addr).await?;
	let mut buf = vec![0u8; 1024];
	loop {
		let (size, src) = socket.recv_from(&mut buf).await?;
		let data = String::from_utf8_lossy(&buf[..size]);
		println!("Received data: {}", data);

		socket.send_to(&buf[..size], &src).await?;
	}
}