type Pair {
    first: String,
    second: String
}

impl Pair {
    fn new(a: String, b: String) {
        self.first = a;
        self.second = b;
    }

    fn sum() -> String {
        return self.first + self.second;
    }
}

fn print_pair(s: Pair) {
    println s.sum();
}

let a = Pair("Wow", " Cool");

print_pair(a);