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diff --git a/pretyping/typeclasses.mli b/pretyping/typeclasses.mli
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+(************************************************************************)
+(*  v      *   The Coq Proof Assistant  /  The Coq Development Team     *)
+(* <O___,, * CNRS-Ecole Polytechnique-INRIA Futurs-Universite Paris Sud *)
+(*   \VV/  **************************************************************)
+(*    //   *      This file is distributed under the terms of the       *)
+(*         *       GNU Lesser General Public License Version 2.1        *)
+(************************************************************************)
+
+(*i $Id: classes.mli 6748 2005-02-18 22:17:50Z herbelin $ i*)
+
+(*i*)
+open Names
+open Decl_kinds
+open Term
+open Sign
+open Evd
+open Environ
+open Nametab
+open Mod_subst
+open Topconstr
+open Util
+(*i*)
+
+(* This module defines type-classes *)
+type typeclass = {
+  cl_name : identifier; (* Name of the class *)
+  cl_context : named_context; (* Context in which superclasses and params are typed (usually types) *)
+  cl_super : named_context; (* Superclasses applied to some of the params *)
+  cl_params : named_context; (* Context of the real parameters (types and operations) *)
+(*   cl_defs : rel_context; (\* Context of the definitions (usually functions), which may be shared *\) *)
+  cl_props : named_context; (* Context of the properties on defs, in Prop, will not be shared *)
+  cl_impl : inductive; (* The class implementation: a record parameterized by params and defs *)
+}
+
+type instance = {
+  is_class: typeclass;
+  is_name: identifier; (* Name of the instance *)
+(*   is_params: named_context; (\* Context of the parameters, instanciated *\) *)
+(*   is_super: named_context; (\* The corresponding superclasses *\) *)
+  is_impl: constant; 
+(*   is_add_hint : unit -> unit; (\* Hook to add an hint for the instance *\) *)
+}
+  
+val instances : Libnames.reference -> instance list
+val typeclasses : unit -> typeclass list
+val add_class : typeclass -> unit
+val add_instance : instance -> unit
+
+val class_info : identifier -> typeclass (* raises Not_found *)
+val class_of_inductive : inductive -> typeclass (* raises Not_found *)
+
+val resolve_one_typeclass : env -> types -> types (* Raises Not_found *)
+val resolve_one_typeclass_evd : env -> evar_defs ref -> types -> types (* Raises Not_found *)
+
+val is_class : inductive -> bool
+
+val class_of_constr : constr -> typeclass option
+
+val resolve_typeclass : env -> evar -> evar_info -> evar_defs * bool -> evar_defs * bool
+val resolve_typeclasses : ?check:bool -> env -> evar_map -> evar_defs -> evar_defs
+
+val solve_instanciation_problem : (env -> evar_defs -> existential_key -> evar_info -> evar_defs * bool) ref
+
+type substitution = (identifier * constr) list
+
+val substitution_of_named_context : 
+  evar_defs ref -> env -> identifier -> int ->
+  substitution -> named_context -> substitution
+
+val nf_substitution : evar_map -> substitution -> substitution