Make2.1-B
type ('a, 'e) t
include Basic3 with type ('a, _, 'e) t := ('a, 'e) t
type ('a, 'd, 'e) t
val apply : ('a -> 'b, 'd, 'e) t -> ('a, 'd, 'e) t -> ('b, 'd, 'e) t
val map : ('a, 'd, 'e) t -> f:('a -> 'b) -> ('b, 'd, 'e) t