* @throws IOException if an I/O error occurs
   * @deprecated Prefer {@code asCharSink(to, charset, FileWriteMode.APPEND).write(from)}.
   */
  @Deprecated
  @InlineMe(
      replacement = "Files.asCharSink(to, charset, FileWriteMode.APPEND).write(from)",
      imports = {"com.google.common.io.FileWriteMode", "com.google.common.io.Files"})
  public

   * @throws IOException if an I/O error occurs
   * @deprecated Prefer {@code asCharSink(to, charset, FileWriteMode.APPEND).write(from)}.
   */
  @Deprecated
  @InlineMe(
      replacement = "Files.asCharSink(to, charset, FileWriteMode.APPEND).write(from)",
      imports = {"com.google.common.io.FileWriteMode", "com.google.common.io.Files"})
  public

        FileOutputStream out = new FileOutputStream(file);
        try {
          out.write(initialBytes);
        } finally {
          out.close();
        }
        return Files.asByteSink(file, FileWriteMode.APPEND);
      }
      return Files.asByteSink(file);
    }

    @Override
    public byte[] getExpected(byte[] bytes) {
      if (initialBytes == null) {
        return checkNotNull(bytes);