> Feature #2348: RBTree Should be Added to the Standard Library

+1

Perhaps something like this would be useful for it (from
http://www.ruby-forum.com/topic/68018)

     class SortedList
       def initialize *elems
         @rbt = RBTree.new
         insert *elems
       end
       def insert *elems
         elems.each{|e| @rbt[e] = e}
         self
       end
       alias_method "<<", "insert"
       def to_a() @rbt.values end
       def inspect() to_a.inspect end
       class << self
         alias_method "[]", "new"
       end
     end