anchor.diff:      future.onComplete((f) {
         if(f.hasValue) {
           if(f.value == true) {
  -          context.success('Finished');
             completer.complete(EXIT_CODE_SUCCESS);
           } else {
             context.error('Failed');
  
positive.code:         final taskName = _args.rest[0];
          if(_state.hasTask(taskName)) {
            var subCtx = ctx.getSubContext(taskName);
            return _runTask(subCtx, taskName);
          } else if(taskName == RAW_TASK_LIST_CMD) {
            _printRawTasks(ctx);
            return new Future.immediate(EXIT_CODE_SUCCESS);
  
negative.code:     }
    }
  
    static int _logExitCode(RootTaskContext ctx, int exitCode) {
      if(exitCode == 0) {
        ctx.log('Finished', AnsiColor.GREEN);
      } else {
        ctx.log('Failed', AnsiColor.RED);
      }
      return exitCode;
    }
  
    static ArgParser _getParser() {
      final parser = new ArgParser();
  
  