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