anchor.diff:      log.fine("Contents:\n$contents");
     }
   
  +  _deleteIfLink(file);
     new File(file).writeAsStringSync(contents, encoding: encoding);
     return file;
   }
  
positive.code:   log.io("Creating $file from stream.");
  
    return _descriptorPool.withResource/*<Future<String>>*/(() async {
      await stream.pipe(new File(file).openWrite());
      log.fine("Created $file from stream.");
      return file;
    });
  }
  
  /// Copies all files in [files] to the directory [destination].
  
negative.code: /// Creates [file] and writes [contents] to it.
  String writeBinaryFile(String file, List<int> contents) {
    log.io("Writing ${contents.length} bytes to binary file $file.");
    _deleteIfLink(file);
    new File(file).openSync(mode: FileMode.WRITE)
        ..writeFromSync(contents)
        ..closeSync();
  