sig
val min_elt : BatSet.S.t -> BatSet.S.elt option
val max_elt : BatSet.S.t -> BatSet.S.elt option
val choose : BatSet.S.t -> BatSet.S.elt option
val any : BatSet.S.t -> BatSet.S.elt option
val find : BatSet.S.elt -> BatSet.S.t -> BatSet.S.elt option
end