>  Unfortunately it does not work is I instantiate a polymorphic type with the
> same idea:
> 
> # module M = struct type 'a t = T end;;
> module M : sig type 'a t = T end
> # type t' = int M.t = T;;
>        ^^^^^^^^^^^^^^^^

Why not do it in two steps?

# module M = struct type 'a t = T end;;
module M : sig type 'a t = T end
# type 'a t' = 'a M.t = T;;
type 'a t' = 'a M.t = T
# type t'' = int t';;
type t'' = int t'

Clearly very clumsy, of course, but it works.

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