fix

Author: staabm

rules/CodeQuality/Rector/ClassMethod/CreateMockToAnonymousClassRector.php

@@ -200,6 +200,10 @@ private function createAnonymousClass(Arg $firstArg): Class_
             throw new NotImplementedYetException();
         }
 
+        if (!$className instanceof Node\Name) {
+            throw new NotImplementedYetException();
+        }
+
         // must respect PHPStan anonymous internal naming \Rector\NodeTypeResolver\PHPStan\Scope\PHPStanNodeScopeResolver::ANONYMOUS_CLASS_START_REGEX
         return new Class_('AnonymousClass1234', [
             'extends' => $className,