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