Parameter Via_dimap_and_left.Req

type ('a, 'b) t

The type held by the Choice Profunctor.

val dimap : ('a -> 'b) -> ('c -> 'd) -> ('b, 'c) t -> ('a, 'd) t
val left : ('a, 'b) t -> (('a, 'c) Stdlib.Either.t, ('b, 'c) Stdlib.Either.t) t

Act on the left parameter of the sum.