search_for_file

# File activesupport/lib/active_support/dependencies.rb, line 468
    def search_for_file(path_suffix)
      path_suffix += ".rb" unless path_suffix.end_with?(".rb")

      autoload_paths.each do |root|
        path = File.join(root, path_suffix)
        return path if File.file? path
      end
      nil # Gee, I sure wish we had first_match ;-)
    end