(*s Pretty-printing of types. [par] is a boolean indicating whether parentheses
are needed or not. *)
-let rec pp_type status par vl t =
+let pp_type status par vl t =
let rec pp_rec status par = function
| Tmeta _ | Tvar' _ | Taxiom -> assert false
| Tvar i -> (try status,pp_tvar (List.nth vl (pred i))