* is referenced somewhere for as long as the enum class is loaded. *Maybe in theory* the enum
     * class could be unloaded after the above call to `getEnumConstants` but before we call
     * `get()`, but that is vanishingly unlikely.
     */
    return ref == null ? Optional.absent() : Optional.fromNullable(enumClass.cast(ref.get()));
  }

  Collection<Entry<K, V>> entries();

  /**
   * Performs the given action for all key-value pairs contained in this multimap. If an ordering is
   * specified by the {@code Multimap} implementation, actions will be performed in the order of
   * iteration of {@link #entries()}. Exceptions thrown by the action are relayed to the caller.
   *
   * <p>To loop over all keys and their associated value collections, write {@code

            .eventListener(
              object : EventListener() {
                override fun secureConnectEnd(
                  call: Call,
                  handshake: Handshake?,
                ) {
                  if (first) {
                    first = false
                    throw SSLException("")
                  }
                }

    assertEquals(Range.atMost(8), range.span(Range.atMost(8)));

    // enclosing, exterior
    assertEquals(Range.closed(2, 10), range.span(Range.closed(2, 10)));
    assertEquals(Range.<Integer>all(), range.span(Range.<Integer>all()));

    // overlap above
    assertEquals(Range.closed(4, 10), range.span(Range.closed(6, 10)));
    assertEquals(Range.atLeast(4), range.span(Range.atLeast(6)));

    // adjacent above

 *
 * <p>The methods returning collections or maps always return views of the underlying table.
 * Updating the table can change the contents of those collections, and updating the collections
 * will change the table.
 *
 * <p>All methods that modify the table are optional, and the views returned by the table may or may
 * not be modifiable. When modification isn't supported, those methods will throw an {@link
 * UnsupportedOperationException}.
 *

        ThumbnailGenerationException exception = new ThumbnailGenerationException("Test", new Exception());

        // The message and cause constructor uses normal super call, so stack trace should be available
        assertTrue(exception.getStackTrace().length > 0);
    }

    @Test
    public void test_multipleNestedExceptions() {
        // Test with multiple nested exceptions

          }
        };
    assertFailure(tester);
  }

  /**
   * This Iterator wraps another iterator and gives it a bug found in JDK6.
   *
   * <p>This bug is this: if you create an iterator from a TreeSet and call next() on that iterator
   * when hasNext() is false, so that next() throws a NoSuchElementException, then subsequent calls
   * to remove() will incorrectly throw an IllegalStateException, instead of removing the last

    https://groups.google.com/g/google-web-toolkit-contributors/c/CqYH59Dt_rQ/m/uVGW1QdUsXUJ
    for details.

    The summary is that it ignores one file in favor of the other.
    util.concurrent, like nearly all our packages, has two .gwt.xml files: one
    for prod and one for tests. However, unlike our other packages, as of this
    writing it has test supersource but no prod supersource.

    }

    /**
     * Retrieves all child documents that belong to the specified parent document.
     *
     * @param searchEngineClient the search engine client to use for retrieval
     * @param id the parent document ID whose children should be retrieved
     * @param fields the fields to include in the response (null for all fields)
     * @return a list of child documents
     */

 * FutureTask}, {@code ListenableFutureTask} does not provide an overrideable {@link
 * FutureTask#done() done()} method. For similar functionality, call {@link #addListener}.
 *
 * <p>Few users should use this class. It is intended primarily for those who are implementing an
 * {@code ExecutorService}. Most users should call {@link ListeningExecutorService#submit(Callable)
 * ListeningExecutorService.submit} on a service obtained from {@link