* @param column The one-based index of the column containing the problem or {@code -1} if unknown.
     * @param cause The cause of the problem, may be {@code null}.
     */
    void add(SettingsProblem.Severity severity, String message, int line, int column, Exception cause);

    public Iterator<E> iterator() {
      return Iterators.unmodifiableIterator(delegate.iterator());
    }

    @Override
    public boolean add(@ParametricNullness E element) {
      throw new UnsupportedOperationException();
    }

    @Override
    public int add(@ParametricNullness E element, int occurrences) {
      throw new UnsupportedOperationException();
    }

    @Override

  }

  @Test
  fun headersBuilder() {
    var builder: Headers.Builder = Headers.Builder()
    builder = builder.add("")
    builder = builder.add("", "")
    builder = builder.addUnsafeNonAscii("", "")
    builder = builder.addAll(headersOf())
    builder = builder.add("", Date(0L))
    builder = builder.add("", Instant.EPOCH)
    builder = builder.set("", "")
    builder = builder.set("", Date(0L))

    public Iterator<E> iterator() {
      return Iterators.unmodifiableIterator(delegate.iterator());
    }

    @Override
    public boolean add(@ParametricNullness E element) {
      throw new UnsupportedOperationException();
    }

    @Override
    public int add(@ParametricNullness E element, int occurrences) {
      throw new UnsupportedOperationException();
    }

    @Override

    builder.add(Range.<Integer>all());

    // Add one-ended ranges
    for (int i = MIN_BOUND; i <= MAX_BOUND; i++) {
      for (BoundType type : BoundType.values()) {
        builder.add(Range.upTo(i, type));
        builder.add(Range.downTo(i, type));
      }
    }

    // Add two-ended ranges
    for (int i = MIN_BOUND; i <= MAX_BOUND; i++) {

        
        // Check if we should add/remove channels
        adjustChannelCount();
    }
    
    private void adjustChannelCount() {
        int currentChannels = channels.size();
        int targetChannels = Math.min(maxChannels, 
            Math.min(localInterfaces.size(), remoteInterfaces.size()));
        
        if (currentChannels < targetChannels) {
            // Add more channels

            if (key.equalsIgnoreCase((String) entry.getKey())) {
                values = (List) entry.getValue();
                values.add(value);
                break;
            }
        }
        if (values == null) {
            values = new ArrayList();
            values.add(value);
            requestProperties.put(key, values);
        }
        // 1.3-compatible.

                    collection.forEach(element -> arraySettings.add(new Tuple<>(key, element)));
                } else if (value instanceof Object[]) {
                    for (final Object element : (Object[]) value) {
                        arraySettings.add(new Tuple<>(key, element));
                    }
                } else {
                    defaultSettings.put(key, value);

            }

            if (build.getFilters() != null) {
                List<String> filters = new ArrayList<>();
                for (String filter : build.getFilters()) {
                    filters.add(alignToBaseDirectory(filter, basedir));
                }
                build.setFilters(filters);
            }

            build.setOutputDirectory(alignToBaseDirectory(build.getOutputDirectory(), basedir));

 *  Be more aggressive about testing pooled sockets before reuse. (thanks
    warpspin)
 *  Include `Content-Type` and `Content-Encoding` in the Apache HTTP client
    adapter. (thanks kwuollett)
 *  Add a media type class to OkHttp.
 *  Change custom header prefix:

    ```
    X-Android-Sent-Millis is now OkHttp-Sent-Millis
    X-Android-Received-Millis is now OkHttp-Received-Millis