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From: Leo White <lpw25@cam.ac.uk>
To: Yotam Barnoy <yotambarnoy@gmail.com>
Cc: Ocaml Mailing List <caml-list@inria.fr>
References: <CAN6ygO=CjGzH3TuWbH9LE2=yYeVErGwDLYZ0xe4Tr0z32ao6Yg@mail.gmail.com>
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	(Yotam Barnoy's message of "Wed, 27 Aug 2014 10:52:41 -0400")
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Subject: Re: [Caml-list] Problem extending the Standard library

>
> Can anyone tell me why the compiler complained about Empty being an unbound constructor when it's declared in Map.Make,
> which I include?
>

I don't think `Empty` is declared in the interface of Map.Make, it may
be declared in the implementation but it is not available in the
interface. Making it available in the interface would break abstraction:
it would force `Map.Make` to keep using that particular implementation.

Regards,

Leo