Hello Charles,

You can write:

  foo.ml:
  type ('a, 'b, 'c) internal_t = { ... }

  type ('a, 'c) t = ('a, <some type>, 'c) internal_t

 
  foo.mli:
  type ('a, 'c) t

So ``hiding the polymorphism in 'b'' can be done, but you have to tell
the compiler which internal type should be used instead of 'b, i.e. you
have to choose <some type>. I guess the unit type will do in most
situations.

Hope this helps,

-- 
François Pottier
Francois.Pottier@inria.fr
http://pauillac.inria.fr/~fpottier/
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