checkNotNull(keyFunction);
    checkNotNull(valueFunction);
    return Collector.of(
        () ->
            new EnumMapAccumulator<K, V>(
                (v1, v2) -> {
                  throw new IllegalArgumentException("Multiple values for key: " + v1 + ", " + v2);
                }),
        (accum, t) -> {
          /*
           * We assign these to variables before calling checkNotNull to work around a bug in our

            if (map != null) {
                synonymMap = map;
                fst = synonymMap.fst;
                if (fst == null) {
                    throw new IllegalArgumentException("fst must be non-null");
                }
                fstReader = fst.getBytesReader();
                scratchArc = new FST.Arc<>();
                clearAttributes();
            }
        }

            Set<String> set = new HashSet<>();
            lifecycle.allPhases().forEach(phase -> {
                if (!set.add(phase.name())) {
                    throw new IllegalArgumentException(
                            "Found duplicated phase '" + phase.name() + "' in '" + lifecycle.id() + "' lifecycle");
                }
            });
        }
    }

    @Override

  }

  private fun testForbidden(
    codePoint: Int,
    codePointString: String,
    component: Component,
  ) {
    val builder = "http://host/".toHttpUrl().newBuilder()
    assertFailsWith<IllegalArgumentException> {
      component[builder] = codePointString
    }
  }

  private fun testPunycode(
    codePointString: String,
    component: Component,
  ) {

     */
    public static ASN1ObjectIdentifier NTLMSSP_OID;

    static {
        try {
            NTLMSSP_OID = new ASN1ObjectIdentifier("1.3.6.1.4.1.311.2.2.10");
        } catch (final IllegalArgumentException e) {
            log.error("Failed to parse OID", e);
        }
    }

    private final NtlmPasswordAuthenticator auth;
    private int ntlmsspFlags;
    private final String workstation;

   * @param count the number of times to repeat it; a nonnegative integer
   * @return a string containing {@code string} repeated {@code count} times (the empty string if
   *     {@code count} is zero)
   * @throws IllegalArgumentException if {@code count} is negative
   */
  @InlineMe(replacement = "string.repeat(count)")
  @InlineMeValidationDisabled("Java 11+ API only")
  public static String repeat(String string, int count) {

   * @return a new, empty {@code ObjectCountHashMap} with enough capacity to hold {@code
   *     expectedSize} elements without resizing
   * @throws IllegalArgumentException if {@code expectedSize} is negative
   */
  static <K extends @Nullable Object> ObjectCountHashMap<K> createWithExpectedSize(
      int expectedSize) {
    return new ObjectCountHashMap<K>(expectedSize);
  }

  }

  private static void testEncodedLengthFails(String invalidString, int invalidCodePointIndex) {
    try {
      Utf8.encodedLength(invalidString);
      fail();
    } catch (IllegalArgumentException expected) {
      assertThat(expected)
          .hasMessageThat()
          .isEqualTo("Unpaired surrogate at index " + invalidCodePointIndex);
    }
  }

  // 128 - [chars 0x0000 to 0x007f]

    private static ASN1ObjectIdentifier SPNEGO_MECH_OID;

    static {
        try {
            SPNEGO_MECH_OID = new ASN1ObjectIdentifier("1.3.6.1.5.5.2");
        } catch (final IllegalArgumentException e) {
            log.error("Failed to initialize OID", e);
        }
    }

    private final SSPContext mechContext;

    private boolean firstResponse = true;
    private boolean completed;

    // for testkit tests, until BwcVersions is extracted into an extension
    public BwcVersions(SortedSet<Version> allVersions, Version currentVersionProperty) {
        if (allVersions.isEmpty()) {
            throw new IllegalArgumentException("Could not parse any versions");
        }

        currentVersion = allVersions.last();

        groupByMajor = allVersions.stream()