Operation.Cval fold_map' : 'a -> ('a -> 'a -> 'a) -> ('b -> 'a) -> ('b, 'index) t -> 'aMap each element of the Foldable to a Monoid an combine the result.
val fold_right : ('a -> 'b -> 'b) -> ('a, 'index) t -> 'b -> 'bSame of List.fold_right for Foldable.