module BatMap:Association tables over ordered types.sig..end
   This module implements applicative association tables, also known as
   finite maps or dictionaries, given a total ordering function
   over the keys.
   All operations over maps are purely applicative (no side-effects).
   The implementation uses balanced binary trees, and therefore searching
   and insertion take time logarithmic in the size of the map.
Author(s): Xavier Leroy (Base module), David Rajchenbach-Teller
Map.Make.module type S =sig..end
module StringMap:Swith type key = String.t
module IStringMap:Swith type key = String.t
module NumStringMap:Swith type key = String.t
module RopeMap:Swith type key = BatRope.t
module IRopeMap:Swith type key = BatRope.t
module IntMap:Swith type key = BatInt.t
module Make: