merge_in

# File lib/rdoc/ri/descriptions.rb, line 88
  def merge_in(old)
    merge(@class_methods, old.class_methods)
    merge(@instance_methods, old.instance_methods)
    merge(@attributes, old.attributes)
    merge(@constants, old.constants)
    merge(@includes, old.includes)
    if @comment.nil? || @comment.empty?
      @comment = old.comment
    else
      unless old.comment.nil? or old.comment.empty? then
        if @comment.nil? or @comment.empty? then
          @comment = old.comment
        else
          @comment << RDoc::Markup::Flow::RULE.new
          @comment.concat old.comment
        end
      end
    end
  end