}

    /**
     * Closes the associated {@link AutoCloseable}
     *
     * <p>Repeated calls will do nothing.
     */
    @Override
    public void close() {
      compact(this, 1);
      justClose();
    }

    /** Calls {@link #close} */
    @Override
    public void run() {
      close();
    }
  }

  /**
   * Remove closed {@link Handle}s
   *
   * @param startWith {@link Handle} to start with
   * @param modLimit number of modifications to make
   */
  public static void compact(Handle startWith, int modLimit) {
    Handle prev = startWith;
    for (Handle handle = startWith.next; handle != null; handle = handle.next) {
      if (handle.closeable == null) continue;
      if (prev.next != handle) prev.next = handle;
      if (modLimit-- <= 0) break;
      prev = handle;
    }
  }

  /**
   * Remove closed {@link Handle}s
   *
   * @param startWith {@link Handle} to start with
   */
  public static void compact(Handle startWith) {
    compact(startWith, Integer.MAX_VALUE);
  }

  /** Remove closed {@link Handle}s */
  public void compact() {
    if (head != null) compact(head);
  }

  int size() {
    int i = 0;
    for (Handle handle = head; handle != null; handle = handle.next) i++;
    return i;
  }