# File lib/hashery/lruhash.rb, line 256
    def insert_after(node)
      raise 'Cannot insert after self' if equal? node
      return self if node.succ.equal? self

      unlink

      self.succ = node.succ
      self.pred = node

      node.succ.pred = self if node.succ
      node.succ = self

      self
    end