ocaml - How can I declare a module (actually a Set.Make) in mli file? -


i have airport.mli , airport.ml.

in airport.ml, have 

module airportset = set.make(struct type t = airport let compare = compare end);;

this no problem.

i have function 

val get_all_airport : unit -> airportset.t;;

, generates airportset.

so in airport.mli, need show module airportset airportset recognized.

how can that?

module airportset : (set.s type elt = airport)

(the parens unnecessary, putting them there know signature expected, in general case of form sig ... end).


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