if( isOpen() ) {
            return;
        }
        fid = open0( flags, access, attrs, options );
        opened = true;
        tree_num = tree.tree_num;
    }
    boolean isOpen() {
        boolean ans = opened && isConnected() && tree_num == tree.tree_num;
        return ans;
    }
    void close( int f, long lastWriteTime ) throws SmbException {

        if( log.level >= 3 )

      this.hash = hash;
      this.next = next;
    }

    @Override
    public K getKey() {
      return get();
    }

    /*
     * It'd be nice to get these for free from AbstractReferenceEntry, but we're already extending
     * WeakReference<K>.
     */

    // null access

    @Override
    public long getAccessTime() {

      this.hash = hash;
      this.next = next;
    }

    @Override
    public K getKey() {
      return get();
    }

    /*
     * It'd be nice to get these for free from AbstractReferenceEntry, but we're already extending
     * WeakReference<K>.
     */

    // null access

    @Override
    public long getAccessTime() {

         * guarantee behavior in that case, anyway, and the current behavior is likely undesirable.
         * So that's either a reason to feel free to change it or a reason to not bother thinking
         * further about this.
         */
        V rightValue = uncheckedCastNullableTToT(onlyOnRight.remove(leftKey));

/**
 * A step in a pipeline of an asynchronous computation. When the last step in the computation is
 * complete, some objects captured during the computation are closed.
 *
 * <p>A pipeline of {@code ClosingFuture}s is a tree of steps. Each step represents either an
 * asynchronously-computed intermediate value, or else an exception that indicates the failure or
 * cancellation of the operation so far. The only way to extract the value or exception from a step