docs: static Class<?> getElementTypeFromEnumSet(Object enumSet)
      {
          if (__elementTypeFromEnumSet == null)
          {
              throw new RuntimeException(
                      "Could not access (reflection) the private "
                              + "field *elementType* (enumClass) from: class java.util.EnumSet");
          }
  
          try
          {
              return (Class<?>) __elementTypeFromEnumSet.get(enumSet);
          }
          catch (Exception e)
          {
              throw new RuntimeException(e);
          }
      }