extern crate csv; // 1.0.2
extern crate serde; // 1.0.80

use std::io;
use std::fs::File;
use std::path::Path;
use serde::Deserialize;

fn load_csv<T, P: AsRef<Path>>(path: P) -> io::Result<impl Iterator<Item=csv::Result<T>>> where T: for<'a> Deserialize<'a> {
  let file = File::open(path)?;
  Ok(csv::Reader::from_reader(file).into_deserialize())
}

fn main() {
    let cities = load_csv("/Users/dominik/Downloads/world-cities_csv.csv").expect("Failed to open file").collect::<Result<Vec<String>, _>>().expect("Filed to load file");
}