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diff --git a/pretyping/typeclasses_errors.ml b/pretyping/typeclasses_errors.ml
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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: typeclasses_errors.ml 11150 2008-06-19 11:38:27Z msozeau $ i*)
+
+(*i*)
+open Names
+open Decl_kinds
+open Term
+open Sign
+open Evd
+open Environ
+open Nametab
+open Mod_subst
+open Topconstr
+open Util
+open Libnames
+(*i*)
+
+type contexts = Parameters | Properties
+
+type typeclass_error = 
+    | NotAClass of constr
+    | UnboundMethod of global_reference * identifier located (* Class name, method *)
+    | NoInstance of identifier located * constr list
+    | UnsatisfiableConstraints of evar_defs * (evar_info * hole_kind) option
+    | MismatchedContextInstance of contexts * constr_expr list * named_context (* found, expected *)
+
+exception TypeClassError of env * typeclass_error
+
+let typeclass_error env err = raise (TypeClassError (env, err))
+
+let not_a_class env c = typeclass_error env (NotAClass c)
+
+let unbound_method env cid id = typeclass_error env (UnboundMethod (cid, id))
+
+let no_instance env id args = typeclass_error env (NoInstance (id, args))
+
+let unsatisfiable_constraints env evd ev = 
+  let evd = Evd.undefined_evars evd in
+    match ev with
+    | None ->
+	raise (TypeClassError (env, UnsatisfiableConstraints (evd, None)))
+    | Some ev ->
+	let evi = Evd.find (Evd.evars_of evd) ev in
+	let loc, kind = Evd.evar_source ev evd in
+	  raise (Stdpp.Exc_located (loc, TypeClassError
+	    (env, UnsatisfiableConstraints (evd, Some (evi, kind)))))
+	    
+let mismatched_ctx_inst env c n m = typeclass_error env (MismatchedContextInstance (c, n, m))