module Option: sig end
sig end
val map : ('a -> 'b) -> 'a option -> 'b option
('a -> 'b) -> 'a option -> 'b option
val do_option : ('a -> 'b) -> 'a option -> 'b option
val iter : ('a -> unit) -> 'a option -> unit
('a -> unit) -> 'a option -> unit