pub trait OnErrDo<I, O, E, F>where I: Iterator<Item = Result<O, E>>, F: Fn(&E),{ fn on_err(self, _: F) -> OnErr<I, O, E, F> ⓘ; }
Extension trait for Iterator<Item = Result<T, E>> to do something on Err(_)
Iterator<Item = Result<T, E>>
Err(_)