extern crate tokio;

use tokio::prelude::*;

fn hello(name: &str) -> impl Future<Item = String, Error = ()> {
    future::ok(format!("Hello, {}", name))
}

fn main() {
    let f = hello("world").and_then(|msg| {
        Ok(println!("{}", msg))
    });

    tokio::run(f);
}