> OK, so I want just "[3; 3]", (no type information),
>
> I can use printf, but it isn't very easy to write when you have i.e.
> list of pairs of lists. And i believe that there is unversal ``print''.
> Can you help?

You still can use the (undocumented because unsafe) Obj module of the
standard distribution. This enable you to recursivly scan ocaml blocks :

let rec print_ints x =
    let r = Obj.repr x in
    match Obj.is_int r with
    | true -> Printf.sprintf "%d" (Obj.magic x : int)
    | false -> (* recursivly print fields from 0 to (Obj.size r)-1 *) ...

val print_ints : 'a -> unit

Nicolas Cannasse

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