[well-formed commit message]: https://tbaggery.com/2008/04/19/a-note-about-git-commit-messages.html

#### Merging pull requests ####

Due to Guava's nature as a subset of Google's internal codebase which is
automatically synced to the public GitHub repository, we are unable to merge
pull requests directly into the master branch. Instead, once a pull request is
ready for merging, we'll make the appropriate changes in the internal codebase

  @Override
  public final void tearDown() {
    try {
      sloppyTearDown();
    } catch (Throwable t) {
      logger.log(Level.INFO, "exception thrown during tearDown: " + t.getMessage(), t);
    }
  }

  public abstract void sloppyTearDown() throws Exception;

   * @return the result returned by the Callable
   * @throws TimeoutException if the time limit is reached
   * @throws InterruptedException if the current thread was interrupted during execution
   * @throws ExecutionException if {@code callable} throws a checked exception
   * @throws UncheckedExecutionException if {@code callable} throws a {@code RuntimeException}

   *     arbitrary past or present time
   */
  abstract long reserveEarliestAvailable(int permits, long nowMicros);

  @Override
  public String toString() {
    return String.format(Locale.ROOT, "RateLimiter[stableRate=%3.1fqps]", getRate());
  }

  abstract static class SleepingStopwatch {
    /** Constructor for use by subclasses. */
    protected SleepingStopwatch() {}

    checkNotNull(mergeFunction, "mergeFunction");

    /*
     * No mutable Table exactly matches the insertion order behavior of ImmutableTable.Builder, but
     * the Builder can't efficiently support merging of duplicate values.  Getting around this
     * requires some work.
     */

    return Collector.of(
        ImmutableTableCollectorState<R, C, V>::new,
        (state, input) ->
            state.put(

   * fallback}. {@link Function#apply} is not invoked until the primary input has failed, so if the
   * primary input succeeds, it is never invoked. If, during the invocation of {@code fallback}, an
   * exception is thrown, this exception is used as the result of the output {@code Future}.
   *
   * <p>Usage example:
   *
   * <pre>{@code

    Set<String> set = of("a", "b", "c", "d", "e", "f", "g", "h");
    assertEquals(Sets.newHashSet("a", "b", "c", "d", "e", "f", "g", "h"), set);
  }

  public void testCopyOf_emptyArray() {
    String[] array = new String[0];
    Set<String> set = copyOf(array);
    assertEquals(Collections.<String>emptySet(), set);
    assertSame(this.<String>of(), set);
  }

  public void testCopyOf_arrayOfOneElement() {

    Set<String> set = of("a", "b", "c", "d", "e", "f", "g", "h");
    assertEquals(Sets.newHashSet("a", "b", "c", "d", "e", "f", "g", "h"), set);
  }

  public void testCopyOf_emptyArray() {
    String[] array = new String[0];
    Set<String> set = copyOf(array);
    assertEquals(Collections.<String>emptySet(), set);
    assertSame(this.<String>of(), set);
  }

  public void testCopyOf_arrayOfOneElement() {

   *     replacement is required
   */
  protected ArrayBasedUnicodeEscaper(
      Map<Character, String> replacementMap,
      int safeMin,
      int safeMax,
      @Nullable String unsafeReplacement) {
    this(ArrayBasedEscaperMap.create(replacementMap), safeMin, safeMax, unsafeReplacement);
  }

  /**

    @SuppressWarnings("GuardedBy")
    @Override
    public String toString() {
      Runnable currentlyRunning = task;
      if (currentlyRunning != null) {
        return "SequentialExecutorWorker{running=" + currentlyRunning + "}";
      }
      return "SequentialExecutorWorker{state=" + workerRunningState + "}";
    }
  }

  @Override
  public String toString() {