Keep the services.yaml file in sync with the default Symfony file

config/services.yaml

@@ -9,15 +9,12 @@ parameters:
 services:
     # default configuration for services in *this* file
     _defaults:
-        # automatically injects dependencies in your services
-        autowire: true
-        # automatically registers your services as commands, event subscribers, etc.
-        autoconfigure: true
-        # this means you cannot fetch services directly from the container via $container->get()
-        # if you need to do this, you can override this setting on individual services
-        public: false
-        # defines the scalar arguments once and apply them to any service defined/created in this file
-        bind:
+        autowire: true      # Automatically injects dependencies in your services.
+        autoconfigure: true # Automatically registers your services as commands, event subscribers, etc.
+        public: false       # Allows optimizing the container by removing unused services; this also means
+                            # fetching services directly from the container via $container->get() won't work.
+                            # The best practice is to be explicit about your dependencies anyway.
+        bind:               # defines the scalar arguments once and apply them to any service defined/created in this file
             $locales: '%app_locales%'
             $defaultLocale: '%locale%'
             $emailSender: '%app.notifications.email_sender%'
@@ -26,9 +23,13 @@ services:
     # this creates a service per class whose id is the fully-qualified class name
     App\:
         resource: '../src/*'
-        # you can exclude directories or files
-        # but if a service is unused, it's removed anyway
-        exclude: '../src/{Entity,Migrations,Tests}'
+        exclude: '../src/{Entity,Migrations,Tests,Kernel.php}'
+
+    # controllers are imported separately to make sure services can be injected
+    # as action arguments even if you don't extend any base controller class
+    App\Controller\:
+        resource: '../src/Controller'
+        tags: ['controller.service_arguments']
 
     # when the service definition only contains arguments, you can omit the
     # 'arguments' key and define the arguments just below the service class