instance method log_error

# File actionpack/lib/action_dispatch/middleware/show_exceptions.rb, line 126
      def log_error(exception)
        return unless logger

        ActiveSupport::Deprecation.silence do
          message = "\n#{exception.class} (#{exception.message}):\n"
          message << exception.annoted_source_code.to_s if exception.respond_to?(:annoted_source_code)
          message << "  " << application_trace(exception).join("\n  ")
          logger.fatal("#{message}\n\n")
        end
      end