log_error (ActionController::Rescue)

    # File lib/action_controller/rescue.rb, line 38
          def log_error(exception) #:doc:
            if ActionView::TemplateError === exception
              logger.fatal(exception.to_s)
            else
              logger.fatal(
                "\n\n#{exception.class} (#{exception.message}):\n    " +
                clean_backtrace(exception).join("\n    ") +
                "\n\n"
              )
            end
          end