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diff --git a/vernac/vernacinterp.ml b/vernac/vernacinterp.ml
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+(************************************************************************)
+(*  v      *   The Coq Proof Assistant  /  The Coq Development Team     *)
+(* <O___,, *   INRIA - CNRS - LIX - LRI - PPS - Copyright 1999-2016     *)
+(*   \VV/  **************************************************************)
+(*    //   *      This file is distributed under the terms of the       *)
+(*         *       GNU Lesser General Public License Version 2.1        *)
+(************************************************************************)
+
+open Util
+open Pp
+open CErrors
+
+type deprecation = bool
+type vernac_command = Genarg.raw_generic_argument list -> unit -> unit
+
+(* Table of vernac entries *)
+let vernac_tab =
+  (Hashtbl.create 51 :
+    (Vernacexpr.extend_name, deprecation * vernac_command) Hashtbl.t)
+
+let vinterp_add depr s f =
+  try
+    Hashtbl.add vernac_tab s (depr, f)
+  with Failure _ ->
+    user_err ~hdr:"vinterp_add"
+      (str"Cannot add the vernac command " ++ str (fst s) ++ str" twice.")
+
+let overwriting_vinterp_add s f =
+  begin
+    try
+      let _ = Hashtbl.find vernac_tab s in Hashtbl.remove vernac_tab s
+    with Not_found -> ()
+  end;
+  Hashtbl.add vernac_tab s (false, f)
+
+let vinterp_map s =
+  try
+    Hashtbl.find vernac_tab s
+  with Failure _ | Not_found ->
+    user_err ~hdr:"Vernac Interpreter"
+      (str"Cannot find vernac command " ++ str (fst s) ++ str".")
+
+let vinterp_init () = Hashtbl.clear vernac_tab
+
+let warn_deprecated_command =
+  let open CWarnings in
+  create ~name:"deprecated-command" ~category:"deprecated"
+         (fun pr -> str "Deprecated vernacular command: " ++ pr)
+
+(* Interpretation of a vernac command *)
+
+let call ?locality (opn,converted_args) =
+  let loc = ref "Looking up command" in
+  try
+    let depr, callback = vinterp_map opn in
+    let () = if depr then
+      let rules = Egramml.get_extend_vernac_rule opn in
+      let pr_gram = function
+      | Egramml.GramTerminal s -> str s
+      | Egramml.GramNonTerminal _ -> str "_"
+      in
+      let pr = pr_sequence pr_gram rules in
+      warn_deprecated_command pr;
+    in
+    loc:= "Checking arguments";
+    let hunk = callback converted_args in
+    loc:= "Executing command";
+    Locality.LocalityFixme.set locality;
+    hunk();
+    Locality.LocalityFixme.assert_consumed()
+  with
+    | Drop -> raise Drop
+    | reraise ->
+        let reraise = CErrors.push reraise in
+        if !Flags.debug then
+	  Feedback.msg_debug (str"Vernac Interpreter " ++ str !loc);
+        iraise reraise