*                  str -> str.substring(1).chars().mapToObj(c -> (char) c));
   *
   * // is equivalent to
   *
   * static final ImmutableSetMultimap<Character, Character> FIRST_LETTER_MULTIMAP =
   *     ImmutableSetMultimap.<Character, Character>builder()
   *         .putAll('b', Arrays.asList('a', 'n', 'a', 'n', 'a'))
   *         .putAll('a', Arrays.asList('p', 'p', 'l', 'e'))
   *         .putAll('c', Arrays.asList('a', 'r', 'r', 'o', 't'))

        throw new DecodingException("Unrecognized character: 0x" + Integer.toHexString(ch));
      }
      int result = decodabet[ch];
      if (result == -1) {
        if (ch <= 0x20 || ch == Ascii.MAX) {
          throw new DecodingException("Unrecognized character: 0x" + Integer.toHexString(ch));
        } else {
          throw new DecodingException("Unrecognized character: " + ch);
        }
      }
      return result;

            .and(Equivalence.equals());
    ImmutableListMultimap<Character, Character> empty = ImmutableListMultimap.of();
    ImmutableListMultimap<Character, Character> filled =
        ImmutableListMultimap.<Character, Character>builder()
            .putAll('b', Arrays.asList('a', 'n', 'a', 'n', 'a'))
            .putAll('a', Arrays.asList('p', 'p', 'l', 'e'))

   */
  @VisibleForTesting
  static boolean validSurrogatePairAt(CharSequence string, int index) {
    return index >= 0
        && index <= (string.length() - 2)
        && Character.isHighSurrogate(string.charAt(index))
        && Character.isLowSurrogate(string.charAt(index + 1));
  }

  /**
   * Returns the given {@code template} string with each occurrence of {@code "%s"} replaced with

    assertFailsToDecode(base16(), "\n\n", "Unrecognized character: 0xa");
    assertFailsToDecode(base16(), "EFGH", "Unrecognized character: G");
    // Valid base16 strings always have an even length.
    assertFailsToDecode(base16(), "A", "Invalid input length 1");
    assertFailsToDecode(base16(), "ABC");
    // These have a combination of invalid length and unrecognized characters.

    assertEquals(Boolean.FALSE, ArbitraryInstances.get(boolean.class));
    assertEquals(Boolean.FALSE, ArbitraryInstances.get(Boolean.class));
    assertEquals(Character.valueOf('\0'), ArbitraryInstances.get(char.class));
    assertEquals(Character.valueOf('\0'), ArbitraryInstances.get(Character.class));
    assertEquals(Byte.valueOf((byte) 0), ArbitraryInstances.get(byte.class));
    assertEquals(Byte.valueOf((byte) 0), ArbitraryInstances.get(Byte.class));

  public void testTryParseAllCodePoints() {
    // Exercise non-ASCII digit test cases and the like.
    char[] tmp = new char[2];
    for (int i = Character.MIN_CODE_POINT; i < Character.MAX_CODE_POINT; i++) {
      Character.toChars(i, tmp, 0);
      checkTryParse(String.copyValueOf(tmp, 0, Character.charCount(i)));
    }
  }

  @GwtIncompatible // Floats.tryParse
  public void testTryParseOfToStringIsOriginal() {

          "com",
          "co.uk",
          "foo.bd",
          "xxxxxx.bd",
          "org.mK",
          "us",
          "co.uk.", // Trailing dot
          "co\uFF61uk", // Alternate dot character
          "\u7f51\u7edc.Cn", // "网络.Cn"
          "j\u00f8rpeland.no", // "jorpeland.no" (first o slashed)
          "xn--jrpeland-54a.no"); // IDNA (punycode) encoding of above

  @Generates
  char generateChar() {
    return generateString().charAt(0);
  }

  @SuppressWarnings("removal") // b/321209431 -- maybe just use valueOf here?
  @Generates
  Character generateCharacter() {
    return new Character(generateChar());
  }

  @Generates
  boolean generateBoolean() {
    return generateInt() % 2 == 0;
  }

        final StringBuilder buf = new StringBuilder(pattern.length());
        for (int i = 0; i < pattern.length(); ++i) {
            final char ch = pattern.charAt(i);
            if (Character.isLetterOrDigit(ch) || Character.isWhitespace(ch)) {
                buf.append(ch);
            }
        }
        if (buf.indexOf("yy") == -1) {
            final int pos = buf.indexOf("y");
            if (pos != -1) {