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From: Martin DeMello <martindemello@gmail.com>
To: "caml-list@inria.fr" <caml-list@inria.fr>
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Subject: [Caml-list] "subclassing" a char map

I have a char multiset defined via

module MultiSet = Map.Make(struct type t = char let compare = compare end)

Now I would like to split off a distinct type that can only contain
A-Z as keys. What's the best way to do this?

martin