log_error

# File actionpack/lib/action_controller/rescue.rb, line 79
      def log_error(exception) #:doc:
        ActiveSupport::Deprecation.silence do
          if ActionView::TemplateError === exception
            logger.fatal(exception.to_s)
          else
            logger.fatal(
              "\n#{exception.class} (#{exception.message}):\n  " +
              clean_backtrace(exception).join("\n  ") + "\n\n"
            )
          end
        end
      end