A simple Rust program to demonstrate loss of cached stdout

directory-size.rs

use std::fs;
use std::env;
use std::process;

fn main() {
    match env::args_os().nth(1) {
        None => {
            print!("nope");
            print!("okay");
            // will cause losss of stdout buffered above
            process::exit(1)
        },
        Some(dir_name) => match fs::read_dir(dir_name) {
            Ok(d) => println!("{}", d.count()),
            Err(e) => println!("{}", e),
        }
    }
}