Make MessengerPass less strict when auto-register handlers

Author: nicholasruunu

DependencyInjection/MessengerPass.php

@@ -206,11 +206,11 @@ private function guessHandledClasses(\ReflectionClass $handlerClass, string $ser
             throw new RuntimeException(sprintf('Invalid handler service "%s": class "%s" must have an "__invoke()" method.', $serviceId, $handlerClass->getName()));
         }
 
-        $parameters = $method->getParameters();
-        if (1 !== \count($parameters)) {
-            throw new RuntimeException(sprintf('Invalid handler service "%s": method "%s::__invoke()" must have exactly one argument corresponding to the message it handles.', $serviceId, $handlerClass->getName()));
+        if (0 === $method->getNumberOfRequiredParameters()) {
+            throw new RuntimeException(sprintf('Invalid handler service "%s": method "%s::__invoke()" requires at least one argument, first one being the message it handles.', $serviceId, $handlerClass->getName()));
         }
 
+        $parameters = $method->getParameters();
         if (!$type = $parameters[0]->getType()) {
             throw new RuntimeException(sprintf('Invalid handler service "%s": argument "$%s" of method "%s::__invoke()" must have a type-hint corresponding to the message class it handles.', $serviceId, $parameters[0]->getName(), $handlerClass->getName()));
         }

Tests/DependencyInjection/MessengerPassTest.php

@@ -391,7 +391,7 @@ public function testNotInvokableHandler()
 
     /**
      * @expectedException \Symfony\Component\DependencyInjection\Exception\RuntimeException
-     * @expectedExceptionMessage Invalid handler service "Symfony\Component\Messenger\Tests\DependencyInjection\MissingArgumentHandler": method "Symfony\Component\Messenger\Tests\DependencyInjection\MissingArgumentHandler::__invoke()" must have exactly one argument corresponding to the message it handles.
+     * @expectedExceptionMessage Invalid handler service "Symfony\Component\Messenger\Tests\DependencyInjection\MissingArgumentHandler": method "Symfony\Component\Messenger\Tests\DependencyInjection\MissingArgumentHandler::__invoke()" requires at least one argument, first one being the message it handles.
      */
     public function testMissingArgumentHandler()
     {