use std::fs::File;
use std::env;
use std::io::{self, BufRead};
use std::path::Path;
fn main() -> std::io::Result<()> {
let fileName = env::args().nth(1);
let fileLines = read_lines(fileName);
Ok(())
}
fn read_lines
(filename: P) -> io::Result>>
where P: AsRef, {
let file = File::open(filename)?;
Ok(io::BufReader::new(file).lines())
}