use std::iter::{Repeat, repeat};

struct InfiniteUnit;

struct ConstUnit<T: Clone>(T);

impl<T: Clone> Iterator for ConstUnit<T> {
    type Item = T;
    fn next(&mut self) -> Option<Self::Item> {
        Some(self.0.clone())
    }
}

impl IntoIterator for InfiniteUnit {
    type Item = u32;
    type IntoIter = Repeat<u32>;

    fn into_iter(self) -> Self::IntoIter {
        repeat(22)
    }
}

fn main() {
    let mut count = 0;
    for _ in InfiniteUnit {
        count += 1;
        println!("count == {}", count);
        if count >= 5 {
            break;
        }
    }
}