top: Supertype (Nonempty List item `AT` item)
top: Supertype (Tree item `AT` item)top method gives you an access to a top element in Nonempty List and Tree datastructures.
The opposite method is sub.
top: Supertype (Nonempty List item `AT` item)
top: Supertype (Tree item `AT` item)top method gives you an access to a top element in Nonempty List and Tree datastructures.
The opposite method is sub.