use std::fmt::Display;

struct Pair<T, U> {
    first: T,
    second: U,
}

impl<T: Display, U: Display> Pair<T, U> {
    fn new(first: T, second: U) -> Self {
        Pair { first, second }
    }

    fn display(&self) {
        println!("({}, {})", self.first, self.second);
    }
}

fn zip<T, U>(a: Vec<T>, b: Vec<U>) -> Vec<(T, U)> {
    a.into_iter().zip(b).collect()
}

fn main() {
    let p = Pair::new(42, "hello");
    p.display();

    let pairs = zip(vec![1, 2, 3], vec!["a", "b", "c"]);
    println!("{:?}", pairs);
}