anchor.diff:  
       // Option to enable hot reloading.
       argParser.addFlag('hot',
  -                      negatable: false,
  -                      defaultsTo: false,
  +                      negatable: true,
  +                      defaultsTo: true,
                         help: 'Run with support for hot reloading.');
   
       // Option to write the pid to a file.
  
positive.code:   String get usagePath {
      Device device = deviceForCommand;
  
      String command = argResults['hot'] ? 'hotrun' : name;
  
      if (device == null)
        return command;
  
negative.code:     }
    }
  
    bool shouldUseHotMode() {
      return argResults['hot'] && (getBuildMode() == BuildMode.debug);
    }
  
    @override
    Future<int> runInProject() async {
      int debugPort;
  