Shared via Rust Playground

playground.rs

use std::io;
use std::io::prelude::*;
use std::io::BufReader;
use std::fs::File;

fn get_line_vec(filename: &str) -> Result<&mut Vec<String>, io::Error> {
	let mut vec: Vec<String> = Vec::new();
	let mut f = try!(File::open(filename));
	BufReader::new(f).lines()
	    .map(|line| vec.push(line.unwrap()));
	Ok(&mut vec)
}

fn main(){
    match get_line_vec("yay.txt") {
        Ok(vec) => {
            let a = vec.pop().unwrap();
            println!("{}", a);
        },
        Err(e) => {
            println!("Error: {}", e.to_string())
        }
    }
}