* to know they are SortedSets and probably would not call this method.
     */
    if (iterable instanceof SortedSet) {
      SortedSet<E> sortedSet = (SortedSet<E>) iterable;
      return Optional.of(sortedSet.last());
    }

    while (true) {
      E current = iterator.next();
      if (!iterator.hasNext()) {
        return Optional.of(current);
      }

  }

  private static class NonNavigableSortedSet extends ForwardingSortedSet<String> {
    private final SortedSet<String> delegate = Sets.newTreeSet();

    @Override
    protected SortedSet<String> delegate() {
      return delegate;
    }
  }

  public void testAsMapSorted() {
    SortedSet<String> strings = new NonNavigableSortedSet();
    Collections.addAll(strings, "one", "two", "three");

      }
    } else {
      for (int i = 0; i < reps; i++) {
        dummy += ORDERING.immutableSortedCopy(input).get(0);
      }
    }
    return dummy;
  }

  @Benchmark
  int sortedSet(int reps) {
    int dummy = 0;
    if (mutable) {
      for (int i = 0; i < reps; i++) {
        dummy += new TreeSet<Integer>(input).first();
      }
    } else {
      for (int i = 0; i < reps; i++) {

     * @param s the sorted set to be placed in the created set
     * @return a new instance of {@link ConcurrentSkipListSet}
     * @see ConcurrentSkipListSet#ConcurrentSkipListSet(SortedSet)
     */
    public static <E> ConcurrentSkipListSet<E> newConcurrentSkipListSet(final SortedSet<? extends E> s) {
        return new ConcurrentSkipListSet<E>(s);
    }

    /**
     * Creates and returns a new instance of {@link CopyOnWriteArrayList}.

import java.util.Collection;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import junit.framework.TestSuite;

/**
 * Creates, based on your criteria, a JUnit test suite that exhaustively tests a SortedSet
 * implementation.
 */
@GwtIncompatible
public class SortedSetTestSuiteBuilder<E> extends SetTestSuiteBuilder<E> {
  public static <E> SortedSetTestSuiteBuilder<E> using(TestSortedSetGenerator<E> generator) {

import java.util.Collection;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.NavigableSet;
import java.util.NoSuchElementException;
import java.util.Set;
import java.util.SortedSet;
import junit.framework.TestCase;
import org.jspecify.annotations.NullUnmarked;

/**
 * Class that contains nested abstract tests for filtered collection views, along with their
 * implementation helpers.
 *

      List<T> list = (List<T>) iterable;
      if (list.isEmpty()) {
        throw new NoSuchElementException();
      }
      return getLastInNonemptyList(list);
    } else if (iterable instanceof SortedSet) {
      return ((SortedSet<T>) iterable).last();
    }

    return Iterators.getLast(iterable.iterator());
  }

  /**
   * Returns the last element of {@code iterable} or {@code defaultValue} if the iterable is empty.

import java.util.Locale;
import java.util.Map;
import java.util.Map.Entry;
import java.util.NavigableMap;
import java.util.NavigableSet;
import java.util.Set;
import java.util.SortedMap;
import java.util.SortedSet;
import java.util.TreeMap;
import java.util.TreeSet;
import java.util.concurrent.ConcurrentMap;
import java.util.concurrent.TimeUnit;
import java.util.regex.MatchResult;
import java.util.regex.Pattern;

 *   <dt>{@link SortedSetMultimap}
 *   <dd>An extension of {@link SetMultimap} for which the {@linkplain SortedSetMultimap#get
 *       collection values} associated with a given key is a {@link java.util.SortedSet}.
 *   <dt>{@link BiMap}
 *   <dd>An extension of {@link java.util.Map} that guarantees the uniqueness of its values as well
 *       as that of its keys. This is sometimes called an "invertible map," since the restriction on

import java.util.Map;
import java.util.Map.Entry;
import java.util.NavigableSet;
import java.util.Queue;
import java.util.RandomAccess;
import java.util.Set;
import java.util.SortedMap;
import java.util.SortedSet;
import java.util.TreeSet;
import junit.framework.TestCase;
import org.jspecify.annotations.NullMarked;
import org.jspecify.annotations.Nullable;

/**
 * Unit test for {@code Multimaps}.
 *