(* base.ml *)
type t = int

(* medium.ml *)
type t = Base.t
let _a : t = 42
let b : t = 53

(* wrapper.mli *)
type t
module Medium : sig
  val b : t
end
val print_int : t -> unit

(* wrapper.ml *)
type t = Base.t
module Medium = struct
  include Medium
end
let print_int : t -> unit = fun n -> Format.printf "%d\n" n

(* main.ml *)
let () = Wrapper.(print_int Medium.b)