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diff --git a/kernel/vmvalues.mli b/kernel/vmvalues.mli
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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 Names
+open Cbytecodes
+
+(** Values *)
+
+type values
+type vm_env
+type vprod
+type vfun
+type vfix
+type vcofix
+type vblock
+type arguments
+type vstack = values array
+type to_update
+
+val fun_val : vfun -> values
+val fix_val : vfix -> values
+val cofix_upd_val : to_update -> values
+
+val fun_env : vfun -> vm_env
+val fix_env : vfix -> vm_env
+val cofix_env : vcofix -> vm_env
+val cofix_upd_env : to_update -> vm_env
+
+(** Cast a value known to be a function, unsafe in general *)
+val fun_of_val : values -> vfun
+
+val crazy_val : values
+
+(** Machine code *)
+
+type tcode
+
+type vswitch = {
+    sw_type_code : tcode;
+    sw_code : tcode;
+    sw_annot : annot_switch;
+    sw_stk : vstack;
+    sw_env : vm_env
+  }
+
+external mkAccuCode : int -> tcode = "coq_makeaccu"
+
+val fun_code : vfun -> tcode
+val fix_code : vfix -> tcode
+val cofix_upd_code : to_update -> tcode
+
+type id_key =
+| ConstKey of Constant.t
+| VarKey of Id.t
+| RelKey of Int.t
+| EvarKey of Evar.t
+
+val eq_id_key : id_key -> id_key -> bool
+
+type atom =
+  | Aid of id_key
+  | Aind of inductive
+  | Asort of Sorts.t
+
+(** Zippers *)
+
+type zipper =
+  | Zapp of arguments
+  | Zfix of vfix * arguments  (** might be empty *)
+  | Zswitch of vswitch
+  | Zproj of Constant.t (* name of the projection *)
+
+type stack = zipper list
+
+type whd =
+  | Vprod of vprod
+  | Vfun of vfun
+  | Vfix of vfix * arguments option
+  | Vcofix of vcofix * to_update * arguments option
+  | Vconstr_const of int
+  | Vconstr_block of vblock
+  | Vatom_stk of atom * stack
+  | Vuniv_level of Univ.Level.t
+
+(** For debugging purposes only *)
+
+val pr_atom : atom -> Pp.t
+val pr_whd : whd -> Pp.t
+val pr_stack : stack -> Pp.t
+
+(** Constructors *)
+
+val val_of_str_const : structured_constant -> values
+val val_of_rel : int -> values
+val val_of_named : Id.t -> values
+val val_of_constant : Constant.t -> values
+val val_of_evar : Evar.t -> values
+val val_of_proj : Constant.t -> values -> values
+val val_of_atom : atom -> values
+
+external val_of_annot_switch : annot_switch -> values = "%identity"
+
+(** Destructors *)
+
+val whd_val : values -> whd
+val uni_lvl_val : values -> Univ.Level.t
+
+(** Arguments *)
+
+val nargs : arguments -> int
+val arg : arguments -> int -> values
+
+(** Product *)
+
+val dom : vprod -> values
+val codom : vprod -> vfun
+
+(** Fun *)
+external closure_arity : vfun -> int = "coq_closure_arity"
+
+(** Fix *)
+
+val current_fix : vfix -> int
+val check_fix : vfix -> vfix -> bool
+val rec_args : vfix -> int array
+val first_fix : vfix -> vfix
+val fix_types : vfix -> tcode array
+val cofix_types : vcofix -> tcode array
+external offset_closure_fix : vfix -> int -> vm_env = "coq_offset_closure"
+val mk_fix_body : int -> int -> vfix -> vfun array
+
+(** CoFix *)
+
+val current_cofix : vcofix -> int
+val check_cofix : vcofix -> vcofix -> bool
+val mk_cofix_body : (vfun -> vstack -> values) -> int -> int -> vcofix -> values array
+
+(** Block *)
+
+val btag  : vblock -> int
+val bsize : vblock -> int
+val bfield : vblock -> int -> values
+
+(** Switch *)
+
+val check_switch : vswitch -> vswitch -> bool
+val branch_arg : int -> Cbytecodes.tag * int -> values