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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 Mod_subst
+open Genarg
+
+type glob_sign = {
+  ltacvars : Id.Set.t;
+  ltacrecvars : Nametab.ltac_constant Id.Map.t;
+  genv : Environ.env }
+
+type ('raw, 'glb) intern_fun = glob_sign -> 'raw -> glob_sign * 'glb
+type 'glb subst_fun = substitution -> 'glb -> 'glb
+
+module InternObj =
+struct
+  type ('raw, 'glb, 'top) obj = ('raw, 'glb) intern_fun
+  let name = "intern"
+  let default _ = None
+end
+
+module SubstObj =
+struct
+  type ('raw, 'glb, 'top) obj = 'glb subst_fun
+  let name = "subst"
+  let default _ = None
+end
+
+module Intern = Register (InternObj)
+module Subst = Register (SubstObj)
+
+let intern = Intern.obj
+let register_intern0 = Intern.register0
+
+let generic_intern ist v =
+  let unpacker wit v =
+    let (ist, v) = intern wit ist (raw v) in
+    (ist, in_gen (glbwit wit) v)
+  in
+  unpack { unpacker; } v
+
+(** Substitution functions *)
+
+let substitute = Subst.obj
+let register_subst0 = Subst.register0
+
+let generic_substitute subs v =
+  let unpacker wit v = in_gen (glbwit wit) (substitute wit subs (glb v)) in
+  unpack { unpacker; } v
+
+let () = Hook.set Detyping.subst_genarg_hook generic_substitute