/**
 * This should be removed when https://bugs.openjdk.org/browse/JDK-8323729
 * is released in our minimum JDK.
 */
class ImmutableCollections {

    private static final Map<?, ?> EMPTY_MAP = new AbstractImmutableMap<>() {
        @Override
        public Set<Entry<Object, Object>> entrySet() {
            return new AbstractImmutableSet<>() {
                @Override