Path dirToDelete = fs.getPath("dir/b/i");
        Path changingFile = dirToDelete.resolve("j/l");
        Path symlinkTarget = fs.getPath("/dontdelete");

        ExecutorService executor = Executors.newSingleThreadExecutor();
        startDirectorySymlinkSwitching(changingFile, symlinkTarget, executor);

        try {
          for (int i = 0; i < iterations; i++) {
            try {

   * despite not throwing a RejectedExecutionException synchronously with the call to {@code
   * execute}. If this behaviour is problematic, use an Executor with a single thread (e.g. {@link
   * Executors#newSingleThreadExecutor}).
   *
   * @since 23.3 (since 23.1 as {@code sequentialExecutor})
   */
  @J2ktIncompatible
  @GwtIncompatible
  public static Executor newSequentialExecutor(Executor delegate) {