l : [1,2,3,4,1,2,3,4]
l.isEmpty() : false
l.length() : 8
l.head() : 1
l.last() : 4
l.at(3) : 4
l.member(3) : true
l.member(9) : false
l2 = l.tail() : [2,3,4,1,2,3,4]
l2.length() : 7
l : [2,3,4,1,2,3,4]
stats for ds.destructive.list.LinkedRing:
# new Node() : 8
# new ListIterator() : 9
