docs: private GenContainer findGenAnnotation(final Field field) {
          for (Annotation annotation : field.getDeclaredAnnotations()) {
              for (Annotation inline : annotation.annotationType().getDeclaredAnnotations()) {
                  if (isGen.test(inline)) {
                      return GenContainer.asGen(inline, annotation);
                  }
              }
          }
  
          return null;
      }