#![allow(dead_code, deprecated, unused_variables, unused_mut)]
use std::fs::File;
use std::io::prelude::*;
use std::io;
#[allow(dead_code)]
fn write_message() -> io::Result<()> {
    let mut file = File::create("valuable_data.txt")?;
    file.write_all(b"important message")?;
    Ok(())
}
fn main() {}