Doubly_linked.Elt
type 'a t
val value : 'a t -> 'a
val equal : 'a t -> 'a t -> Base.Bool.t
pointer equality
val set : 'a t -> 'a -> Base.Unit.t
val sexp_of_t : ('a -> Base.Sexp.t) -> 'a t -> Base.Sexp.t