return (Collector) TO_OPTIONAL;
  }

  private static final Object NULL_PLACEHOLDER = new Object();

  private static final Collector<@Nullable Object, ?, @Nullable Object> ONLY_ELEMENT =
      Collector.<@Nullable Object, ToOptionalState<Object>, @Nullable Object>of(
          () -> new ToOptionalState<>(null),
          (state, o) -> state.add((o == null) ? NULL_PLACEHOLDER : o),
          ToOptionalState::combine,

   */
  public static <E> Builder<E> orderedBy(Comparator<E> comparator) {
    return new Builder<>(comparator);
  }

  /**
   * Returns a builder that creates immutable sorted sets whose elements are ordered by the reverse
   * of their natural ordering.
   */
  public static <E extends Comparable<?>> Builder<E> reverseOrder() {
    return new Builder<>(Collections.reverseOrder());
  }

  /**

          protected void verify(List<T> elements) {
            assertEquals(new HashSet<>(elements), newHashSet(mmHeap.iterator()));
            assertIntact(mmHeap);
          }
        };
    tester.test();
  }

  public void testIteratorTester() throws Exception {
    Random random = new Random(0);
    List<Integer> list = new ArrayList<>();
    for (int i = 0; i < 3; i++) {
      list.add(random.nextInt());

    String upperString = testString.toUpperCase();
    CharSequence testSeq = new StringBuilder(testString);
    CharSequence upperSeq = new StringBuilder(upperString);
    CharSequence[] lhs = new CharSequence[] {testString, testSeq, testString, testSeq};
    CharSequence[] rhs = new CharSequence[] {upperString, upperString, upperSeq, upperSeq};

    boolean dummy = false;

  private static List<String> newDelegatingList(List<String> delegate) {
    return Reflection.newProxy(List.class, new DelegatingInvocationHandler(delegate));
  }

  @SuppressWarnings("unchecked") // proxy of List<String>
  private static List<String> newDelegatingListWithEquals(List<String> delegate) {
    return Reflection.newProxy(List.class, new DelegatingInvocationHandlerWithEquals(delegate));
  }

     */
    public static ZipFile create(final String file) {
        assertArgumentNotEmpty("file", file);

        try {
            return new ZipFile(file);
        } catch (final IOException e) {
            throw new IORuntimeException(e);
        }
    }

    /**
     * Creates and returns a <code>ZipFile</code> for reading the specified file.
     *
     * @param file

@NullUnmarked
public class IntMathBenchmark {
  private static final int[] exponent = new int[ARRAY_SIZE];
  private static final int[] factorial = new int[ARRAY_SIZE];
  private static final int[] binomial = new int[ARRAY_SIZE];
  private static final int[] positive = new int[ARRAY_SIZE];
  private static final int[] nonnegative = new int[ARRAY_SIZE];
  private static final int[] ints = new int[ARRAY_SIZE];

  @BeforeExperiment
  void setUp() {

                        keys ->
                            path.create(transform(keys, key -> immutableEntry(key, new Object()))),
                        keys ->
                            path.create(transform(keys, key -> immutableEntry(new Object(), key))),
                        keys -> path.create(transform(keys, key -> immutableEntry(key, key)))))
            .collect(toImmutableList()),

        return;
      }
      prevInBucket = entryInBucket;
    }
    throw new AssertionError("Expected to find entry with value " + values[entry]);
  }

  /**
   * Updates the specified entry to point to the new value: removes the old value from the V-to-K
   * mapping and puts the new one in. The entry does not move in the insertion order of the bimap.
   */

            throw new InvalidQueryRegisteredException(msg);
        }
    }

    protected void checkEsInvalidQueryCollection(String name, Collection<?> values) {
        if (values == null || values.isEmpty()) {
            String msg = "Cannot register null or empty query collection: name=" + name + " values=" + values;
            throw new InvalidQueryRegisteredException(msg);
        }
    }