throw new AssertionError(impossible);
    }
  }

  /**
   * Returns an optional enum constant for the given type, using {@link Enum#valueOf}. If the
   * constant does not exist, {@link Optional#absent} is returned. A common use case is for parsing
   * user input or falling back to a default enum constant. For example, {@code
   * Enums.getIfPresent(Country.class, countryInput).or(Country.DEFAULT);}
   *
   * @since 12.0

    return implied;
  }

  @Retention(RetentionPolicy.RUNTIME)
  @Inherited
  @TesterAnnotation
  public @interface Require {
    CollectionFeature[] value() default {};

    CollectionFeature[] absent() default {};
  }

provide OkHttp with an HTTP request, you’re describing the request at a high-level: _“fetch me this URL with these headers.”_ For correctness and efficiency, OkHttp rewrites your request before transmitting it.

OkHttp may add headers that are absent from the original request, including `Content-Length`, `Transfer-Encoding`, `User-Agent`, `Host`, `Connection`, and `Content-Type`. It will add an `Accept-Encoding` header for transparent response compression unless the header is already present....

    segment.count++;
    assertThat(segment.get(key, hash)).isSameInstanceAs(value);
    assertThat(segment.containsKey(key, hash)).isTrue();
    assertThat(segment.containsValue(value)).isTrue();
    // don't see absent values now that count > 0
    assertThat(segment.get(new Object(), hash)).isNull();

    // null key
    DummyEntry<Object, Object> nullEntry = DummyEntry.create(null, hash, entry);

    segment.count++;
    assertThat(segment.get(key, hash)).isSameInstanceAs(value);
    assertThat(segment.containsKey(key, hash)).isTrue();
    assertThat(segment.containsValue(value)).isTrue();
    // don't see absent values now that count > 0
    assertThat(segment.get(new Object(), hash)).isNull();

    // null key
    DummyEntry<Object, Object> nullEntry = DummyEntry.create(null, hash, entry);

    // count == 1
    segment.count++;
    assertSame(value, segment.get(key, hash));
    assertTrue(segment.containsKey(key, hash));
    assertTrue(segment.containsValue(value));
    // don't see absent values now that count > 0
    assertThat(segment.get(new Object(), hash)).isNull();

    // null key
    InternalEntry<Object, Object, ?> nullEntry = segment.newEntryForTesting(null, hash, entry);

    // count == 1
    segment.count++;
    assertSame(value, segment.get(key, hash));
    assertTrue(segment.containsKey(key, hash));
    assertTrue(segment.containsValue(value));
    // don't see absent values now that count > 0
    assertThat(segment.get(new Object(), hash)).isNull();

    // null key
    InternalEntry<Object, Object, ?> nullEntry = segment.newEntryForTesting(null, hash, entry);

   *     previous entry. (If the bimap contains null values, then {@code forcePut}, like {@code
   *     put}, returns {@code null} both if the key is absent and if it is present with a null
   *     value.)
   */
  @CanIgnoreReturnValue
  @Nullable V forcePut(@ParametricNullness K key, @ParametricNullness V value);

  // Bulk Operations

  /**
   * {@inheritDoc}

   for an interruption before doing a blocking call. If it is interrupted,
   it throws an `InterruptedIOException`.

## Version 1.5.2

_2014-03-17_

 * Fix bug where deleting a file that was absent from the `HttpResponseCache`
   caused an IOException.
 * Fix bug in HTTP/2 where our HPACK decoder wasn't emitting entries in
   certain eviction scenarios, leading to dropped response headers.

## Version 1.5.1

        array[getNumElements()]);
    // array[getNumElements() + 1] might or might not have been nulled
  }

  @CollectionSize.Require(absent = ZERO)
  public void testToArray_emptyArrayOfWrongTypeForNonEmptyCollection() {
    assertThrows(
        ArrayStoreException.class,
        () -> {
          WrongType[] array = new WrongType[0];