only allow ReflectionNamedType's for ServiceSubscriberTrait

kbond · kbond · commit fdb2c43e4a43 · 2021-11-03T14:13:15.000-04:00
diff --git a/src/Symfony/Contracts/Service/ServiceSubscriberTrait.php b/src/Symfony/Contracts/Service/ServiceSubscriberTrait.php
@@ -42,9 +42,19 @@ public static function getSubscribedServices(): array
                 continue;
             }
 
-            if (self::class === $method->getDeclaringClass()->name && ($returnType = $method->getReturnType()) && !$returnType->isBuiltin()) {
-                $services[self::class.'::'.$method->name] = '?'.($returnType instanceof \ReflectionNamedType ? $returnType->getName() : $returnType);
+            if (self::class !== $method->getDeclaringClass()->name) {
+                continue;
+            }
+
+            if (!($returnType = $method->getReturnType()) instanceof \ReflectionNamedType) {
+                continue;
             }
+
+            if ($returnType->isBuiltin()) {
+                continue;
+            }
+
+            $services[self::class.'::'.$method->name] = '?'.$returnType->getName();
         }
 
         return $services;
