Core_via_dimap_and_fst.Req
type ('a, 'b) t
The type held by the Strong Profunctor.
Strong Profunctor
val dimap : ('a -> 'b) -> ('c -> 'd) -> ('b, 'c) t -> ('a, 'd) t
val fst : ('a, 'b) t -> ('a * 'c, 'b * 'c) t
Act on the first parameter of the product.