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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 Classops
+open Globnames
+
+(** Classes and coercions. *)
+
+(** [try_add_new_coercion_with_target ref s src tg] declares [ref] as a coercion
+   from [src] to [tg] *)
+val try_add_new_coercion_with_target : global_reference -> local:bool -> 
+  Decl_kinds.polymorphic ->
+  source:cl_typ -> target:cl_typ ->  unit
+
+(** [try_add_new_coercion ref s] declares [ref], assumed to be of type
+   [(x1:T1)...(xn:Tn)src->tg], as a coercion from [src] to [tg] *)
+val try_add_new_coercion : global_reference -> local:bool -> 
+  Decl_kinds.polymorphic -> unit
+
+(** [try_add_new_coercion_subclass cst s] expects that [cst] denotes a
+   transparent constant which unfolds to some class [tg]; it declares
+   an identity coercion from [cst] to [tg], named something like
+   ["Id_cst_tg"] *)
+val try_add_new_coercion_subclass : cl_typ -> local:bool -> 
+  Decl_kinds.polymorphic -> unit
+
+(** [try_add_new_coercion_with_source ref s src] declares [ref] as a coercion
+   from [src] to [tg] where the target is inferred from the type of [ref] *)
+val try_add_new_coercion_with_source : global_reference -> local:bool -> 
+  Decl_kinds.polymorphic -> source:cl_typ -> unit
+
+(** [try_add_new_identity_coercion id s src tg] enriches the
+   environment with a new definition of name [id] declared as an
+   identity coercion from [src] to [tg] *)
+val try_add_new_identity_coercion : Id.t -> local:bool -> 
+  Decl_kinds.polymorphic -> source:cl_typ -> target:cl_typ -> unit
+
+val add_coercion_hook : Decl_kinds.polymorphic -> unit Lemmas.declaration_hook
+
+val add_subclass_hook : Decl_kinds.polymorphic -> unit Lemmas.declaration_hook
+
+val class_of_global : global_reference -> cl_typ