Via_map_fst_and_map_snd.Req
type ('a, 'b) t
The type held by the Bifunctor
Bifunctor
val map_fst : ('a -> 'b) -> ('a, 'c) t -> ('b, 'c) t
Mapping over the first argument.
val map_snd : ('b -> 'c) -> ('a, 'b) t -> ('a, 'c) t
Mapping over the second argument.