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(************************************************************************)
(*  v      *   The Coq Proof Assistant  /  The Coq Development Team     *)
(* <O___,, *   INRIA - CNRS - LIX - LRI - PPS - Copyright 1999-2010     *)
(*   \VV/  **************************************************************)
(*    //   *      This file is distributed under the terms of the       *)
(*         *       GNU Lesser General Public License Version 2.1        *)
(************************************************************************)

(** Missing pervasive types from OCaml stdlib *)

type ('a, 'b) union = Inl of 'a | Inr of 'b
(** Union type *)

type 'a until = Stop of 'a | Cont of 'a
(** Used for browsable-until structures. *)

type (_, _) eq = Refl : ('a, 'a) eq

module type SetS =
sig
    type elt
    type t
    val empty: t
    val is_empty: t -> bool
    val mem: elt -> t -> bool
    val add: elt -> t -> t
    val singleton: elt -> t
    val remove: elt -> t -> t
    val union: t -> t -> t
    val inter: t -> t -> t
    val diff: t -> t -> t
    val compare: t -> t -> int
    val equal: t -> t -> bool
    val subset: t -> t -> bool
    val iter: (elt -> unit) -> t -> unit
    val fold: (elt -> 'a -> 'a) -> t -> 'a -> 'a
    val for_all: (elt -> bool) -> t -> bool
    val exists: (elt -> bool) -> t -> bool
    val filter: (elt -> bool) -> t -> t
    val partition: (elt -> bool) -> t -> t * t
    val cardinal: t -> int
    val elements: t -> elt list
    val min_elt: t -> elt
    val max_elt: t -> elt
    val choose: t -> elt
    val split: elt -> t -> t * bool * t
end
(** Redeclaration of OCaml set signature, to preserve compatibility. See OCaml
    documentation for more information. *)

module type EmptyS = sig end

module type MapS =
sig
    type key
    type (+'a) t
    val empty: 'a t
    val is_empty: 'a t -> bool
    val mem: key -> 'a t -> bool
    val add: key -> 'a -> 'a t -> 'a t
    val singleton: key -> 'a -> 'a t
    val remove: key -> 'a t -> 'a t
    val merge:
         (key -> 'a option -> 'b option -> 'c option) -> 'a t -> 'b t -> 'c t
    val compare: ('a -> 'a -> int) -> 'a t -> 'a t -> int
    val equal: ('a -> 'a -> bool) -> 'a t -> 'a t -> bool
    val iter: (key -> 'a -> unit) -> 'a t -> unit
    val fold: (key -> 'a -> 'b -> 'b) -> 'a t -> 'b -> 'b
    val for_all: (key -> 'a -> bool) -> 'a t -> bool
    val exists: (key -> 'a -> bool) -> 'a t -> bool
    val filter: (key -> 'a -> bool) -> 'a t -> 'a t
    val partition: (key -> 'a -> bool) -> 'a t -> 'a t * 'a t
    val cardinal: 'a t -> int
    val bindings: 'a t -> (key * 'a) list
    val min_binding: 'a t -> (key * 'a)
    val max_binding: 'a t -> (key * 'a)
    val choose: 'a t -> (key * 'a)
    val split: key -> 'a t -> 'a t * 'a option * 'a t
    val find: key -> 'a t -> 'a
    val map: ('a -> 'b) -> 'a t -> 'b t
    val mapi: (key -> 'a -> 'b) -> 'a t -> 'b t
end