Parameter 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