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diff --git a/parsing/g_natsyntax.ml b/parsing/g_natsyntax.ml
deleted file mode 100644
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--- a/parsing/g_natsyntax.ml
+++ /dev/null
@@ -1,78 +0,0 @@
-(************************************************************************)
-(*  v      *   The Coq Proof Assistant  /  The Coq Development Team     *)
-(* <O___,, * CNRS-Ecole Polytechnique-INRIA Futurs-Universite Paris Sud *)
-(*   \VV/  **************************************************************)
-(*    //   *      This file is distributed under the terms of the       *)
-(*         *       GNU Lesser General Public License Version 2.1        *)
-(************************************************************************)
-
-(* $Id: g_natsyntax.ml 10348 2007-12-06 17:36:14Z aspiwack $ *)
-
-(* This file defines the printer for natural numbers in [nat] *)
-
-(*i*)
-open Pcoq
-open Pp
-open Util
-open Names
-open Coqlib
-open Rawterm
-open Libnames
-open Bigint
-open Coqlib
-open Notation
-open Pp
-open Util
-open Names
-(*i*)
-
-(**********************************************************************)
-(* Parsing via scopes *)
-(* For example, (nat_of_string "3") is <<(S (S (S O)))>> *)
-
-let nat_of_int dloc n =
-  if is_pos_or_zero n then begin
-      if less_than (of_string "5000") n then
-	Flags.if_warn msg_warning 
-	  (strbrk "Stack overflow or segmentation fault happens when " ++
-	   strbrk "working with large numbers in nat (observed threshold " ++
-	   strbrk "may vary from 5000 to 70000 depending on your system " ++
-	   strbrk "limits and on the command executed).");
-      let ref_O = RRef (dloc, glob_O) in
-      let ref_S = RRef (dloc, glob_S) in
-      let rec mk_nat acc n =
-	if n <> zero then 
-	  mk_nat (RApp (dloc,ref_S, [acc])) (sub_1 n)
-	else 
-	  acc
-      in 
-      mk_nat ref_O n
-    end
-  else
-      user_err_loc (dloc, "nat_of_int",
-        str "Cannot interpret a negative number as a number of type nat")
-
-(************************************************************************)
-(* Printing via scopes *)
-
-exception Non_closed_number
-
-let rec int_of_nat = function
-  | RApp (_,RRef (_,s),[a]) when s = glob_S -> add_1 (int_of_nat a)
-  | RRef (_,z) when z = glob_O -> zero
-  | _ -> raise Non_closed_number
-	  
-let uninterp_nat p =
-  try 
-    Some (int_of_nat p)
-  with
-    Non_closed_number -> None
-
-(************************************************************************)
-(* Declare the primitive parsers and printers *)
-
-let _ =
-  Notation.declare_numeral_interpreter "nat_scope"
-    (nat_path,["Coq";"Init";"Datatypes"])
-    nat_of_int
-    ([RRef (dummy_loc,glob_S); RRef (dummy_loc,glob_O)], uninterp_nat, true)