return null;
    }

    @Override
    public boolean equals(Object o) {
        return this == o || o instanceof PathSource ps && Objects.equals(path, ps.path);
    }

    @Override
    public int hashCode() {
        return Objects.hash(path);
    }

    @Override
    public String toString() {
        return "PathSource[" + "location='" + location + '\'' + ", " + "path=" + path + ']';
    }

  }

  /**
   * This atrocity is here to let us report several of the elements in the stream if there were more
   * than one, not just two.
   */
  private static final class ToOptionalState {
    static final int MAX_EXTRAS = 4;

    @CheckForNull Object element;
    List<Object> extras;

    ToOptionalState() {
      element = null;
      extras = emptyList();
    }