Make3.Monad_infix
val (>>|) : ('a, 'd, 'e) X.t -> ('a -> 'b) -> ('a, 'd, 'e) X.t
val (>>=) : ('a, 'd, 'e) X.t -> ('a -> ('a, 'd, 'e) X.t) -> ('a, 'd, 'e) X.t