Function dptree::filter_with_description

pub fn filter_with_description<'a, Pred, Input, Output, FnArgs, Descr>(
    description: Descr,
    pred: Pred
) -> Handler<'a, Input, Output, Descr> where
    Asyncify<Pred>: Injectable<Input, bool, FnArgs> + Send + Sync + 'a,
    Input: Send + 'a,
    Output: 'a, 

filter with a custom description.