Functor Traversable.Make2

module Make2: 
functor (T : Basic2) -> S2 with type 'a t := 'a T.t and type ('u, 'a) f := ('u, 'a) T.f
Parameters:
T : Basic2

include Traversable.Basic2
val sequence : ('u, 'a) f t -> ('u, 'a t) f
val sequence_ : ('u, 'a) f t -> ('u, unit) f