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diff --git a/tactics/geninterp.ml b/tactics/geninterp.ml
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+(************************************************************************)
+(*  v      *   The Coq Proof Assistant  /  The Coq Development Team     *)
+(* <O___,, *   INRIA - CNRS - LIX - LRI - PPS - Copyright 1999-2015     *)
+(*   \VV/  **************************************************************)
+(*    //   *      This file is distributed under the terms of the       *)
+(*         *       GNU Lesser General Public License Version 2.1        *)
+(************************************************************************)
+
+open Names
+open Genarg
+
+module TacStore = Store.Make(struct end)
+
+type interp_sign = {
+  lfun : tlevel generic_argument Id.Map.t;
+  extra : TacStore.t }
+
+type ('glb, 'top) interp_fun = interp_sign ->
+    Goal.goal Evd.sigma -> 'glb -> Evd.evar_map * 'top
+
+module InterpObj =
+struct
+  type ('raw, 'glb, 'top) obj = ('glb, 'top) interp_fun
+  let name = "interp"
+  let default _ = None
+end
+
+module Interp = Register(InterpObj)
+
+let interp = Interp.obj
+let register_interp0 = Interp.register0
+
+let generic_interp ist gl v =
+  let unpacker wit v =
+    let (sigma, ans) = interp wit ist gl (glb v) in
+    (sigma, in_gen (topwit wit) ans)
+  in
+  unpack { unpacker; } v