Functor Datatype.Map.Make

module Make: 
functor (Data : Datatype.S-> Datatype.S with type t = Data.t t

Build a datatype of the map according to the datatype of values in the map.

Parameters:
Data : Datatype.S

include Datatype.S_no_copy
val copy : Datatype.t -> Datatype.t

Deep copy: no possible sharing between x and copy x.