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(* $Id$ *)
(* Bounded stacks. If the depth is [None], then there is no depth limit. *)
type 'a t
val create : int option -> 'a t
val set_depth : 'a t -> int option -> unit
val push : 'a t -> 'a -> unit
val app_push : 'a t -> ('a -> 'a) -> unit
val app_repl : 'a t -> ('a -> 'a) -> unit
val pop : 'a t -> 'a option
val top : 'a t -> 'a option
val is_empty : 'a t -> bool
val depth : 'a t -> int
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