foo.rs

#![feature(io)]

use std::io;
use std::io::prelude::*;

fn main() {
    let mut stdin = io::stdin();
    let mut stdout = io::stdout();

    loop {
        write!(&mut stdout, "> ");
        stdout.flush();

        let mut input = String::new();
        stdin.read_line(&mut input);

        if input == "exit\n" {
            break;
        }

        writeln!(&mut stdout, "Input: {:?}", input);
    }
}