@ForOverride
  @ParametricNullness
  abstract T doFallback(F fallback, X throwable) throws Exception;

  /** Template method for subtypes to actually set the result. */
  @ForOverride
  abstract void setResult(@ParametricNullness T result);

  @Override
  protected final void afterDone() {
    @RetainedLocalRef ListenableFuture<? extends V> localInputFuture = inputFuture;

    @SuppressWarnings("unchecked") // prepend() returns Iterable<String>
    Iterable<String> result =
        (Iterable<String>) delegate.invoke(null, "a", ImmutableList.of("b", "c"));
    assertEquals(ImmutableList.of("a", "b", "c"), ImmutableList.copyOf(result));
  }

  public void testStaticMethod_returning() throws Exception {
    Invokable<?, Iterable<String>> delegate =

    @SuppressWarnings("unchecked") // prepend() returns Iterable<String>
    Iterable<String> result =
        (Iterable<String>) delegate.invoke(null, "a", ImmutableList.of("b", "c"));
    assertEquals(ImmutableList.of("a", "b", "c"), ImmutableList.copyOf(result));
  }

  public void testStaticMethod_returning() throws Exception {
    Invokable<?, Iterable<String>> delegate =

    Set<Feature<?>> result = computeDerivedCollectionFeatures(multimapFeatures);
    if (multimapFeatures.contains(MapFeature.ALLOWS_NULL_ENTRY_QUERIES)) {
      result.add(CollectionFeature.ALLOWS_NULL_QUERIES);
    }
    return result;
  }

  static Set<Feature<?>> computeValuesFeatures(Set<Feature<?>> multimapFeatures) {
    Set<Feature<?>> result = computeDerivedCollectionFeatures(multimapFeatures);

        } else {
          connectionUser.dnsStart(socketHost)

          val result = address.dns.lookup(socketHost)
          if (result.isEmpty()) {
            throw UnknownHostException("${address.dns} returned no addresses for $socketHost")
          }

          connectionUser.dnsEnd(socketHost, result)
          result
        }

      // Try each address for best behavior in mixed IPv4/IPv6 environments.

      length += array.length;
    }
    float[] result = new float[checkNoOverflow(length)];
    int pos = 0;
    for (float[] array : arrays) {
      System.arraycopy(array, 0, result, pos, array.length);
      pos += array.length;
    }
    return result;
  }

  private static int checkNoOverflow(long result) {
    checkArgument(
        result == (int) result,

      length += array.length;
    }
    float[] result = new float[checkNoOverflow(length)];
    int pos = 0;
    for (float[] array : arrays) {
      System.arraycopy(array, 0, result, pos, array.length);
      pos += array.length;
    }
    return result;
  }

  private static int checkNoOverflow(long result) {
    checkArgument(
        result == (int) result,

  public void testVerifyNotNull_simple_success() {
    String result = verifyNotNull(NON_NULL_STRING);
    assertSame(NON_NULL_STRING, result);
  }

  public void testVerifyNotNull_simple_failure() {
    assertThrows(VerifyException.class, () -> verifyNotNull(null));
  }

  public void testVerifyNotNull_complexMessage_success() {
    String result = verifyNotNull(NON_NULL_STRING, "%s", IGNORE_ME);

                new ApiResult.ApiConfigsResponse<EditBody>().settings(list.stream().map(this::createEditBody).collect(Collectors.toList()))
                        .total(pager.getAllRecordCount()).status(ApiResult.Status.OK).result());
    }

    // GET /api/admin/webconfig/setting/{id}
    @Execute
    public JsonResponse<ApiResult> get$setting(final String id) {

      length += array.length;
    }
    byte[] result = new byte[checkNoOverflow(length)];
    int pos = 0;
    for (byte[] array : arrays) {
      System.arraycopy(array, 0, result, pos, array.length);
      pos += array.length;
    }
    return result;
  }

  private static int checkNoOverflow(long result) {
    checkArgument(
        result == (int) result,