private @Nullable String checkCygwin() {
    final String[] OTHER_WINDOWS_PATHS = {FileUtil.toSystemDependentName("cygwin/bin/git.exe")};
    for (String otherPath : OTHER_WINDOWS_PATHS) {
      File file = new File(getWinRoot(), otherPath);
      if (file.exists()) {
        return file.getPath();
      }
    }
    return null;
  }
private @Nullable String checkCygwin()