* parameter, or if the constructor or factory method throws exception.
     *
     * @return this tester
     */
    @CanIgnoreReturnValue
    @SuppressWarnings("CatchingUnchecked") // sneaky checked exception
    public FactoryMethodReturnValueTester testSerializable() throws Exception {
      for (Invokable<?, ?> factory : getFactoriesToTest()) {
        Object instance = instantiate(factory);

    private final Adder adder;

    FailsToPropagateException(Adder adder) {
      this.adder = adder;
    }

    @Override
    @SuppressWarnings("CatchingUnchecked") // sneaky checked exception
    public int add(int a, int b) {
      try {
        return adder.add(a, b);
      } catch (Exception e) { // sneaky checked exception
        // swallow!
        return 0;

    private final Adder adder;

    FailsToPropagateException(Adder adder) {
      this.adder = adder;
    }

    @Override
    @SuppressWarnings("CatchingUnchecked") // sneaky checked exception
    public int add(int a, int b) {
      try {
        return adder.add(a, b);
      } catch (Exception e) { // sneaky checked exception
        // swallow!
        return 0;

     * parameter, or if the constructor or factory method throws exception.
     *
     * @return this tester
     */
    @CanIgnoreReturnValue
    @SuppressWarnings("CatchingUnchecked") // sneaky checked exception
    public FactoryMethodReturnValueTester testSerializable() throws Exception {
      for (Invokable<?, ?> factory : getFactoriesToTest()) {
        Object instance = instantiate(factory);

        builder.append(lenientToString(args[i]));
        prefix = ", ";
      }
      builder.append(']');
    }

    return builder.toString();
  }

  @SuppressWarnings("CatchingUnchecked") // sneaky checked exception
  private static String lenientToString(@Nullable Object o) {
    if (o == null) {
      return "null";
    }
    try {
      return o.toString();

  protected Map<K, V> makeEitherMap() {
    try {
      return makePopulatedMap();
    } catch (UnsupportedOperationException e) {
      return makeEmptyMap();
    }
  }

  @SuppressWarnings("CatchingUnchecked") // sneaky checked exception
  protected final boolean supportsValuesHashCode(Map<K, V> map) {
    // get the first non-null value
    Collection<V> values = map.values();
    for (V value : values) {

  public static DoubleStream stream(OptionalDouble optional) {
    return optional.isPresent() ? DoubleStream.of(optional.getAsDouble()) : DoubleStream.empty();
  }

  @SuppressWarnings("CatchingUnchecked") // sneaky checked exception
  private static void closeAll(BaseStream<?, ?>[] toClose) {
    // If one of the streams throws an exception, continue closing the others, then throw the

   *     appear to be a BloomFilter serialized using the {@linkplain #writeTo(OutputStream)} method.
   */
  @SuppressWarnings("CatchingUnchecked") // sneaky checked exception
  public static <T extends @Nullable Object> BloomFilter<T> readFrom(
      InputStream in, Funnel<? super T> funnel) throws IOException {
    checkNotNull(in, "InputStream");