pub struct Counter<A> {
// some fields omitted
}An infinite iterator starting at start and advancing by step with each
iteration
impl<A: Add<A> + Clone> Iterator for Counter<A>fn next(&mut self) -> Option<A>fn size_hint(&self) -> (usize, Option<usize>)fn size_hint(&self) -> (usize, Option<usize>)type Itemimpl<A> Copy for Counter<A>impl<A: Clone> Clone for Counter<A>fn clone(&self) -> Counter<A>fn clone_from(&mut self, &Counter<A>)
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tdef).