docs: @Override
      void findReferencedClassNames(final Set<String> classNameListOut) {
          for (final TypeParameter typeParameter : typeParameters) {
              typeParameter.findReferencedClassNames(classNameListOut);
          }
          if (superclassSignature != null) {
              superclassSignature.findReferencedClassNames(classNameListOut);
          }
          for (final ClassRefTypeSignature typeSignature : superinterfaceSignatures) {
              typeSignature.findReferencedClassNames(classNameListOut);
          }
      }