instance

# File railties/lib/rails/application.rb, line 50
      def instance
        if self == Rails::Application
          if Rails.application
            ActiveSupport::Deprecation.warn "Calling a method in Rails::Application is deprecated, " <<
              "please call it directly in your application constant #{Rails.application.class.name}.", caller
          end
          Rails.application
        else
          @@instance ||= new
        end
      end