[Rust] nested module demo.

mod english {
    pub mod greeting {
        pub fn hello(name: &str) {
            println!("Hello, {}", name);
        }
    }

    pub mod farewell {
        pub fn goodbye(name: &str) {
            println!("Goodbye, {}", name);
        }
    }
}

fn main() {
    use english;

    english::greeting::hello("Michael");
    english::farewell::goodbye("Michael");
}