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diff --git a/helm/gTopLevel/tacticals.ml b/helm/gTopLevel/tacticals.ml
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-(* Copyright (C) 2002, HELM Team.
- * 
- * This file is part of HELM, an Hypertextual, Electronic
- * Library of Mathematics, developed at the Computer Science
- * Department, University of Bologna, Italy.
- * 
- * HELM is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version 2
- * of the License, or (at your option) any later version.
- * 
- * HELM is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with HELM; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place - Suite 330, Boston,
- * MA  02111-1307, USA.
- * 
- * For details, see the HELM World-Wide-Web page,
- * http://cs.unibo.it/helm/.
- *)
-
-open CicReduction
-open PrimitiveTactics
-open ProofEngineTypes
-open UriManager
-
-(** DEBUGGING *)
-
-  (** perform debugging output? *)
-let debug = false
-
-  (** debugging print *)
-let warn s =
-  if debug then
-    prerr_endline ("TACTICALS WARNING: " ^ s)
-
-(** AUX TACTIC{,AL}S *)
-
-  (**
-    naive implementation of ORELSE tactical, try a sequence of tactics in turn:
-    if one fails pass to the next one and so on, eventually raises (failure "no
-    tactics left")
-    TODO warning: not tail recursive due to "try .. with" boxing
-  *)
-let rec try_tactics ~(tactics: (string * tactic) list) ~status =
-  warn "in Ring.try_tactics";
-  match tactics with
-  | (descr, tac)::tactics ->
-      warn ("Ring.try_tactics IS TRYING " ^ descr);
-      (try
-        let res = tac ~status in
-        warn ("Ring.try_tactics: " ^ descr ^ " succedeed!!!");
-        res
-       with
-        e ->
-         match e with
-            (Fail _)
-          | (CicTypeChecker.NotWellTyped _)
-          | (CicUnification.UnificationFailed) ->
-              warn (
-                "Ring.try_tactics failed with exn: " ^
-                Printexc.to_string e);
-              try_tactics ~tactics ~status
-        | _ -> raise e (* [e] must not be caught ; let's re-raise it *)
-      )
-  | [] -> raise (Fail "try_tactics: no tactics left")
-
-let thens ~start ~continuations ~status =
- let (proof,new_goals) = start ~status in
-  try
-   List.fold_left2
-    (fun (proof,goals) goal tactic ->
-      let (proof',new_goals') = tactic ~status:(proof,goal) in
-       (proof',goals@new_goals')
-    ) (proof,[]) new_goals continuations
-  with
-   Invalid_argument _ -> raise (Fail "thens: wrong number of new goals")
-
-let then_ ~start ~continuation ~status =
- let (proof,new_goals) = start ~status in
-  List.fold_left
-   (fun (proof,goals) goal ->
-     let (proof',new_goals') = continuation ~status:(proof,goal) in
-      (proof',goals@new_goals')
-   ) (proof,[]) new_goals