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diff --git a/toplevel/g_toplevel.mlg b/toplevel/g_toplevel.mlg
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+(************************************************************************)
+(*         *   The Coq Proof Assistant / The Coq Development Team       *)
+(*  v      *   INRIA, CNRS and contributors - Copyright 1999-2018       *)
+(* <O___,, *       (see CREDITS file for the list of authors)           *)
+(*   \VV/  **************************************************************)
+(*    //   *    This file is distributed under the terms of the         *)
+(*         *     GNU Lesser General Public License Version 2.1          *)
+(*         *     (see LICENSE file for the text of the license)         *)
+(************************************************************************)
+
+{
+open Pcoq
+open Pcoq.Prim
+open Vernacexpr
+
+(* Vernaculars specific to the toplevel *)
+type vernac_toplevel =
+  | VernacBacktrack of int * int * int
+  | VernacDrop
+  | VernacQuit
+  | VernacControl of vernac_control
+
+module Toplevel_ : sig
+  val vernac_toplevel : vernac_toplevel CAst.t Entry.t
+end = struct
+  let gec_vernac s = Entry.create ("toplevel:" ^ s)
+  let vernac_toplevel = gec_vernac "vernac_toplevel"
+end
+
+open Toplevel_
+
+}
+
+GRAMMAR EXTEND Gram
+  GLOBAL: vernac_toplevel;
+  vernac_toplevel: FIRST
+    [ [ IDENT "Drop"; "." -> { CAst.make VernacDrop }
+      | IDENT "Quit"; "." -> { CAst.make VernacQuit }
+      | IDENT "Backtrack"; n = natural ; m = natural ; p = natural; "." ->
+        { CAst.make (VernacBacktrack (n,m,p)) }
+      | cmd = Pvernac.main_entry ->
+              { match cmd with
+              | None -> raise Stm.End_of_input
+              | Some (loc,c) -> CAst.make ~loc (VernacControl c) }
+      ]
+    ]
+  ;
+END
+
+{
+
+let parse_toplevel pa = Pcoq.Entry.parse vernac_toplevel pa
+
+}