Shared via Rust Playground

playground.rs

use std::collections::HashMap;
use std::io;
use std::io::prelude::*;
use std::io::BufReader;
use std::fs::File;
use std::error::Error;
use std::mem;
use std::str;

type Something<'a> = HashMap<&'a str, &'a str>;

fn getLines(filename: &str) -> Result<io::Lines<BufReader<File>>, io::Error> {
	let mut f = try!(File::open(filename));
	Ok(BufReader::new(f).lines())
}

fn getSomething<'a>() -> Result<&'a Something<'a>, io::Error> {
	let mut something = Something::new();
	try!(getLines("gates.txt"))
	    .map(|line| line.unwrap().as_ref())
	    .map(|line| something.insert(line, line));
	Ok(&something)
}
fn main() {
	match getSomething() {
		Ok(something) => println!("Values: (yay, {})", something.get("yay").unwrap()),
		Err(e) => println!("Error: {}", e.to_string()),
	}
}