include module type of Core.Option.Let_syntax
val return : 'a -> 'a Base__Option.t
val (>>=) : 'a Base__Option.t -> ('a -> 'b Base__Option.t) -> 'b Base__Option.t
val (>>|) : 'a Base__Option.t -> ('a -> 'b) -> 'b Base__Option.t
val let+ : 'a option -> ('a -> 'b) -> 'b option
val and+ : 'a option -> 'b option -> ('a * 'b) option
val let* : 'a option -> ('a -> 'b option) -> 'b option
val and* : 'a option -> 'b option -> ('a * 'b) option