code: public static <T extends ModifierReviewable.OfEnumeration> ElementMatcher.Junction<T> isEnum() {
          return new ModifierMatcher<T>(ModifierMatcher.Mode.ENUMERATION);
      }
docs: Matches a {@link ModifierReviewable.OfEnumeration} that is an {@code enum} or a field holding an enum.
  
  @param <T> The type of the matched object.
  @return A matcher for an enum.