    # File lib/active_support/buffered_logger.rb, line 63
        def add(severity, message = nil, progname = nil, &block)
          return if @level > severity
          message = (message || (block && block.call) || progname).to_s
          # If a newline is necessary then create a new message ending with a newline.
          # Ensures that the original message is not mutated.
          message = "#{message}\n" unless message[-1] == ?\n
          buffer << message
          auto_flush
          message
        end