anchor.diff:  
     static Uint8List write(Dataset ds,
         {String path = "",
  -      File file,
  -      bool fmiOnly = false,
  -      fast = false,
  -      TransferSyntax targetTS}) {
  +        File file,
  +        bool fmiOnly = false,
  +        fast = false,
  +        TransferSyntax targetTS}) {
       if (file != null)
         return writeFile(ds, file,
             fmiOnly: fmiOnly, fast: fast, targetTS: targetTS);
  
positive.code:     return v;
    }
  
    /// Writes the [Dataset] to a [Uint8List]. Returns the [Uint8List].
    static Uint8List writeBytes(Dataset ds,
        {String path = "",
        bool fmiOnly = false,
        fast = false,
        TransferSyntax targetTS}) {
      if (ds == null || ds.length == 0)
        throw new ArgumentError('Empty ' 'Empty Dataset: $ds');
      var writer = (fast) ? new DcmByteWriter.fast(ds) : new DcmByteWriter(ds);
  
negative.code:   // External Interface for testing
    void xWritePrivateData(Element pc, Element e) => _writeElement(e);
  
  }
  