deprecate_positional_rack_server_and_rewrite_to_option

# File railties/lib/rails/commands/server/server_command.rb, line 267
        def deprecate_positional_rack_server_and_rewrite_to_option(original_options)
          if using
            ActiveSupport::Deprecation.warn(<<~MSG.squish)
              Passing the Rack server name as a regular argument is deprecated
              and will be removed in the next Rails version. Please, use the -u
              option instead.
            MSG

            original_options.concat [ "-u", using ]
          else
            # Use positional internally to get around Thor's immutable options.
            # TODO: Replace `using` occurrences with `options[:using]` after deprecation removal.
            @using = options[:using]
          end
        end