Module `Option2`

val map : ('a -> 'b) -> 'a option -> 'b option
val pure_bind : 'a option -> ('a -> 'b) -> 'b option
val bind : 'a option -> ('a -> 'b option) -> 'b option
val and_then : ('a -> 'b option) -> 'a option -> 'b option
val guard : bool -> unit option
val sequence : 'a option list -> 'a list option
val with_default : 'a -> 'a option -> 'a
val sequence_fst : ('a option * 'b) -> ('a * 'b) option
val sequence_snd : ('a * 'b option) -> ('a * 'b) option
val filter : ('a -> bool) -> 'a option -> 'a option

module Syntax : sig ... end