Function warp::filter::filter_fn_one

source ยท 
pub(crate) fn filter_fn_one<F, U>(
    func: F,
) -> impl Filter<Extract = (U::Ok,), Error = U::Error> + Copy
where
    F: Fn(&mut Route) -> U + Copy,
    U: TryFuture + Send + 'static,
    U::Ok: Send,
    U::Error: IsReject,