class Gem::Doctor

def doctor_child(sub_directory, extension) # :nodoc:
  directory = File.join(@gem_repository, sub_directory)
  Dir.entries(directory).sort.each do |ent|
    next if ent == "." || ent == ".."
    child = File.join(directory, ent)
    next unless File.exist?(child)
    basename = File.basename(child, extension)
    next if installed_specs.include? basename
    next if /^rubygems-\d/ =~ basename
    next if 'specifications' == sub_directory and 'default' == basename
    next if 'plugins' == sub_directory and Gem.plugin_suffix_regexp =~ basename
    type = File.directory?(child) ? 'directory' : 'file'
    action = if @dry_run
               'Extra'
             else
               FileUtils.rm_r(child)
               'Removed'
             end
    say "#{action} #{type} #{sub_directory}/#{File.basename(child)}"
  end
rescue Errno::ENOENT
  # ignore
end