if (result == null) {
        @SuppressWarnings({"unchecked", "rawtypes"})
        ImmutableList<TypeToken<? super T>> collectedTypes =
            (ImmutableList)
                TypeCollector.FOR_GENERIC_TYPE.classesOnly().collectTypes(TypeToken.this);
        return (classes =
            FluentIterable.from(collectedTypes)
                .filter(TypeFilter.IGNORE_TYPE_VARIABLE_OR_WILDCARD)
                .toSet());
      } else {