hseeberger

use std::iter;

fn main() {
    println!("{:?}", fibs_iter().skip(42).next().unwrap());
    println!("{}", fibs_recursive(42));
}

fn fibs_iter() -> impl Iterator<Item = u128> {
    let mut a = 0;
    let mut b = 1;

hseeberger

trait Monad<A> {
    type M<X>: Monad<X>;

    fn unit(a: A) -> Self::M<A>;

    fn bind<B, F>(self, f: F) -> Self::M<B>
    where
        F: FnMut(A) -> Self::M<B>;
}