i am bad at rust

bad.rs

use std::process;
use std::io;

fn main() {
    let server_process = match process::Command::new("bash")
        .arg("-c")
        .arg("for i in 1 2 3 4 5 6 7 8 9; do echo hello; sleep 1; done")
        .stdout(process::Stdio::piped())
        .stdin(process::Stdio::piped())
        .spawn() {
        Err(why) => panic!("Failed to start server: {}", why),
        Ok(proc) => proc,
    };
//    let output = server_process.wait_with_output();
    let reader = io::BufReader::new(server_process.stdout.as_mut().unwrap());
    loop {
        let mut line = String::new();
        reader.read_line(&mut line).unwrap();
        println!("{}", line);
//        reader.lines().for_each(|line| println!("{}", line));
    }
}