class IRB::Locale

def search_file(lib_paths, dir, file)
  each_localized_path(dir, file) do |lc_path|
    lib_paths.each do |libpath|
      full_path = File.join(libpath, lc_path)
      return full_path if File.readable?(full_path)
    end
    redo if defined?(Gem) and Gem.try_activate(lc_path)
  end
  nil
end