I would like to ask:

- Where is that restriction explained?
  (I've searched Ocaml reference manual for "monomorphic" but nothing
   relevant seemed to come up)

- Where are things like:

     'a. 'a -> unit

  described?

I'm not sure if the restriction is explained anywhere but the solution is described in:

 http://caml.inria.fr/pub/docs/manual-ocaml-4.00/manual021.html#toc79

Regards,

Leo

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