return false;
      }
    }

    @Override
    public int hashCode() {
      return m.hashCode();
    }
  }

  // Test that we should get a distinct parameter error when doing equals test.
  static class ConstructorParameterWithOptionalNotInstantiable {
    public ConstructorParameterWithOptionalNotInstantiable(Optional<NotInstantiable> x) {
      checkNotNull(x);
    }

     *
     * @param inputStream the input stream to read from
     * @return the detected character set name, or null if not found
     * @throws CrawlingAccessException if an error occurs while reading the content
     */
    protected String loadCharset(final InputStream inputStream) {
        BufferedInputStream bis = null;
        String encoding = null;
        try {

        };
    }

    /**
     * Returns the signing key for SMB signing.
     *
     * @param challenge the server challenge bytes
     * @return the signing key
     * @throws SmbException if an error occurs generating the signing key
     */
    public byte[] getSigningKey(final byte[] challenge) throws SmbException {
        switch (LM_COMPATIBILITY) {
        case 0:
        case 1:
        case 2:

     * @return the redirect URL if a redirect occurred, null otherwise
     * @throws ChildUrlsException if child URLs are discovered during processing
     * @throws DataStoreCrawlingException if an error occurs during crawling
     */
    protected String processRequest(final DataStoreParams paramMap, final Map<String, Object> dataMap, final String url,
            final CrawlerClient client) {

    }.also { expected ->
      assertThat(expected.message).isEqualTo("PROTOCOL_ERROR: TYPE_DATA streamId == 0")
    }
  }

  /** We do not send SETTINGS_COMPRESS_DATA = 1, nor want to. Let's make sure we error.  */
  @Test fun compressedDataFrameWhenSettingDisabled() {
    val expectedData = ByteArray(Http2.INITIAL_MAX_FRAME_SIZE)
    Arrays.fill(expectedData, 2.toByte())
    val zipped = gzip(expectedData)

Tham số `name` được định nghĩa là `Optional[str]`, nhưng nó **không phải là tùy chọn**, bạn không thể gọi hàm mà không có tham số:

```Python
say_hi()  # Oh, no, this throws an error! 😱
```

Tham số `name` **vẫn được yêu cầu** (không phải là *tùy chọn*) vì nó không có giá trị mặc định. Trong khi đó, `name` chấp nhận `None` như là giá trị:

```Python

<setting id="org.eclipse.wst.jsdt.core.formatter.brace_position_for_array_initializer" value="end_of_line"/>
<setting id="org.eclipse.wst.jsdt.core.compiler.problem.assertIdentifier" value="error"/>
<setting id="org.eclipse.wst.jsdt.core.formatter.insert_space_after_comma_in_constructor_declaration_throws" value="insert"/>
<setting id="org.eclipse.wst.jsdt.core.formatter.insert_space_before_colon_in_assert" value="insert"/>

    // exception later. If more than one stream throws an exception, the later ones are added to the
    // first as suppressed exceptions. We don't catch Error on the grounds that it should be allowed
    // to propagate immediately.
    Exception exception = null;
    for (BaseStream<?, ?> stream : toClose) {
      try {
        stream.close();

            restoreInterruptIfIsInterruptedException(ignored);
            logger
                .get()
                .log(
                    Level.WARNING,
                    "Error while attempting to shut down the service after failure.",
                    ignored);
          }
          notifyFailed(t);
          // requireNonNull is safe now, just as it was above.

    prefers `%20` when doing its own encoding, but will retain `+` when that is
    provided.
 *  Fix: Enforce that callers call `WebSocket.close()` on IO errors. Error
    handling in WebSockets is significantly improved.
 *  Fix: Don't use SPDY/3 style header concatenation for HTTP/2 request headers.
    This could have corrupted requests where multiple headers had the same name,