sig type 'a t = 'a option = None | Some of 'a val none : 'a option val some : 'a -> 'a option val value : 'a option -> default:'a -> 'a val get : 'a option -> 'a val bind : 'a option -> ('a -> 'b option) -> 'b option val join : 'a option option -> 'a option val map : ('a -> 'b) -> 'a option -> 'b option val fold : none:'a -> some:('b -> 'a) -> 'b option -> 'a val iter : ('a -> unit) -> 'a option -> unit val is_none : 'a option -> bool val is_some : 'a option -> bool val equal : ('a -> 'a -> bool) -> 'a option -> 'a option -> bool val compare : ('a -> 'a -> int) -> 'a option -> 'a option -> int val to_result : none:'e -> 'a option -> ('a, 'e) Stdlib.result val to_list : 'a option -> 'a list val to_seq : 'a option -> 'a Stdlib.Seq.t end