Of_monad.1-M
type 'a t
val return : 'a -> 'a t
val map : 'a t -> f:('a -> 'b) -> 'b t
val apply : [ `Custom of ('a -> 'b) t -> 'a t -> 'b t | `Define_using_bind ]
val bind : 'a t -> f:('a -> 'b t) -> 'b t