if rl.save_history (&hist_file.unwrap()).is_err () {
eprintln! ("{}", SAVE_HISTORY_ERROR);
}
if rl.save_history (&hist_file.unwrap()).is_err () {
eprintln! ("{}", SAVE_HISTORY_ERROR);
}
}
fn main() {
// collect the command line arguments - if any
let args : Vec<String> = env::args().collect ();
// regular expression to match a number
}
fn main() {
// collect the command line arguments - if any
let args : Vec<String> = env::args().collect ();
// regular expression to match a number