val (<$>) : ('a -> 'b) -> 'a Option.Monad.t -> 'b Option.Monad.tval (<@>) : 'a Option.Monad.t -> ('a -> 'b) -> 'b Option.Monad.tval (<*>) : ('a -> 'b) Option.Monad.t -> 'a Option.Monad.t -> 'b Option.Monad.tval (>>=) : 'a Option.Monad.t -> ('a -> 'b Option.Monad.t) -> 'b Option.Monad.tval (=<<) : ('a -> 'b Option.Monad.t) -> 'a Option.Monad.t -> 'b Option.Monad.tval (>=>) : ('a -> 'b Option.Monad.t) -> ('b -> 'c Option.Monad.t) -> 'a -> 'c Option.Monad.tval (<=<) : ('a -> 'b Option.Monad.t) -> ('c -> 'a Option.Monad.t) -> 'c -> 'b Option.Monad.t