Function dptree::filter_map_async_with_description

pub fn filter_map_async_with_description<'a, Projection, Input, Output, NewType, Args, Descr>(
    description: Descr,
    proj: Projection
) -> Handler<'a, Input, Output, Descr> where
    Input: Clone,
    Projection: Injectable<Input, Option<NewType>, Args> + Send + Sync + 'a,
    Input: Insert<NewType> + Send + 'a,
    Output: 'a,
    NewType: Send, 

filter_map_async with a custom description.