* See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.google.common.collect;

import static com.google.common.collect.Sets.unmodifiableNavigableSet;

import com.google.common.annotations.GwtCompatible;
import com.google.common.annotations.GwtIncompatible;
import com.google.common.annotations.J2ktIncompatible;

      return set;
    }
    return new UnmodifiableNavigableSet<>(set);
  }

  static final class UnmodifiableNavigableSet<E extends @Nullable Object>
      extends ForwardingSortedSet<E> implements NavigableSet<E>, Serializable {
    private final NavigableSet<E> delegate;
    private final SortedSet<E> unmodifiableDelegate;

    UnmodifiableNavigableSet(NavigableSet<E> delegate) {

 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.google.common.collect;

import static com.google.common.collect.Sets.unmodifiableNavigableSet;
import static java.util.Collections.unmodifiableSortedSet;

import com.google.common.annotations.GwtCompatible;
import com.google.common.annotations.GwtIncompatible;

      return set;
    }
    return new UnmodifiableNavigableSet<>(set);
  }

  static final class UnmodifiableNavigableSet<E extends @Nullable Object>
      extends ForwardingSortedSet<E> implements NavigableSet<E>, Serializable {
    private final NavigableSet<E> delegate;
    private final SortedSet<E> unmodifiableDelegate;

    UnmodifiableNavigableSet(NavigableSet<E> delegate) {

 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.google.common.collect;

import static com.google.common.collect.Sets.unmodifiableNavigableSet;
import static java.util.Collections.unmodifiableSortedSet;

import com.google.common.annotations.GwtCompatible;
import com.google.common.annotations.GwtIncompatible;

                NavigableSet<String> innerSet = new TreeSet<>();
                Collections.addAll(innerSet, elements);
                return Collections.unmodifiableNavigableSet(innerSet);
              }
            })
        .named("unmodifiableNavigableSet/TreeSet, natural")
        .withFeatures(
            CollectionFeature.KNOWN_ORDER,
            CollectionFeature.RESTRICTS_ELEMENTS,

      return navigableKeySet();
    }

    @Override
    public NavigableSet<K> navigableKeySet() {
      return Sets.unmodifiableNavigableSet(delegate.navigableKeySet());
    }

    @Override
    public NavigableSet<K> descendingKeySet() {
      return Sets.unmodifiableNavigableSet(delegate.descendingKeySet());
    }

    @Override

      return navigableKeySet();
    }

    @Override
    public NavigableSet<K> navigableKeySet() {
      return Sets.unmodifiableNavigableSet(delegate.navigableKeySet());
    }

    @Override
    public NavigableSet<K> descendingKeySet() {
      return Sets.unmodifiableNavigableSet(delegate.descendingKeySet());
    }

    @Override

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