valid_app_const? -> valid_const?

railties/lib/rails/tasks/framework.rake

@@ -47,7 +47,7 @@ namespace :rails do
         gen = Rails::Generators::AppGenerator.new ["rails"], { with_dispatchers: true },
                                                              destination_root: Rails.root
         File.exists?(Rails.root.join("config", "application.rb")) ?
-          gen.send(:app_const) : gen.send(:valid_app_const?)
+          gen.send(:app_const) : gen.send(:valid_const?)
         gen
       end
     end