Interface.MONAD
include APPLICATIVE
include APPLY
include FUNCTOR
type 'a t
val map : ('a -> 'b) -> 'a t -> 'b t
val apply : ('a -> 'b) t -> 'a t -> 'b t
val pure : 'a -> 'a t
val flat_map : 'a t -> ('a -> 'b t) -> 'b t