Why println! works but not print!

1

Here is the code

use std::net::UdpSocket;

fn main() {
    let local_socket = UdpSocket::bind("127.0.0.1:2222").unwrap();
    let mut buf = [0u8; 512];
    loop {
        println!("wait ... ");
        match local_socket.recv_from(&mut buf){
            Ok(_) => {
                println!("Ok");
            }
            Err(_) => {
                println!("Err");
            }
        }
    }
}

Test the code with

dig @127.0.0.1 -p 2222 www.google.com

would works fine with output wait ... before dig , but when I change println!("wait ... "); to print!("wait ... ");, It doesn't print anything until dig happen. I don't know why does this happen?

The testing environment is rustc 1.0.0-nightly (93f7fe32d 2015-04-10) (built 2015-04-11) on x86_64 GNU/Linux

Thank you

2

See https://github.com/rust-lang/rust/issues/23818

3

Oh, I see, Thank you!