Garry Hodgson wrote:
> 
> no, i hadn't thought of that.  works fine now.  thanks!

After thinking about it, I figured out a better explanation for
this restriction. Suppose you have the following code:

let h = Hashtbl.create 10

module M = (struct
  type t = A
  let _ = Hashtbl.add h 0 A
end : sig end)

let t = Hashtbl.get h 0

then type t would be visible outside M, whereas module M,
restricted by its signature, does not export it. I think this
is the meaning of the error message: "The type constructor t
would escape its scope". So it rather is a safe restriction.

Regards

-- Nicolas
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