remove_private_comments

# File lib/rdoc/parser/ruby.rb, line 1644
  def remove_private_comments(comment)
    empty = ''
    empty.force_encoding comment.encoding if Object.const_defined? :Encoding

    comment.gsub!(/^#--.*?^#\+\+\n?/, empty)
    comment.sub!(/^#--.*/, '')
  end