/**
* Prepend the given value to this list.
*
* @param a The value to prepend.
* @return A non-empty list with an extra element.
*/
public NonEmptyList<A> cons(final A a) {
return nel(a, tail.cons(head));
}
/**
* Returns a <code>List</code> projection of this list.
*
* @return A <code>List</code> projection of this list.
*/
public List<A> toList() {
return tail.cons(head);
}