@PublicAPI(usage = ACCESS)
    public static DescribedPredicate<Iterable<?>> empty() {
        return EMPTY;
    }
@Test
    public void empty_works() {
        assertThat(empty())
                .hasDescription("empty")
                .accepts(emptyList())
                .accepts(emptySet())
                .rejects(ImmutableList.of(1))
                .rejects(Collections.singleton(""));
    }