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 = HashMap<String, String>;

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 get_something() -> Result<Something, io::Error> {
	let mut something = Something::new();
	let mut lines = try!(get_line_vec("gates.txt"));
	while let Some(line) = lines.pop() {
	    something.insert(line, line);
	}
	Ok(something)
}
fn main() {
	match get_something() {
		Ok(something) => println!("Values: (yay, {})", something.get("yay").unwrap()),
		Err(e) => println!("Error: {}", e.to_string()),
	}
}