private static boolean isAntFileOld(VirtualFile file) {
    if (file instanceof NewVirtualFile) {
      try (DataInputStream is = ourAttribute.readFileAttribute(file)) {
        if (is != null) {
          return is.readBoolean();
        }
        return false;
      }
      catch (IOException e) {
        LOG.error(e);
      }
    }
    return Boolean.TRUE.equals(file.getUserData(ourAntFileMarker));
  }
private static boolean isAntFileOld(VirtualFile file)