static @NotNull Pair<String, String> splitPath(@NotNull String path) {
    int separator = path.indexOf(URLUtil.JAR_SEPARATOR);
    if (separator < 0) throw new IllegalArgumentException("Path in JarFileSystem must contain a separator: " + path);
    return pair(path.substring(0, separator), path.substring(separator + URLUtil.JAR_SEPARATOR.length()));
  }
static @NotNull Pair<String, String> splitPath(@NotNull String path)