mpyw / co

            throw $result;

        } elseif ($parent_hash === 'async') { // Co::async() complete?

            $this->unsetTree($hash); // No more needed

        } elseif ($parent && !$this->value_to_children[$parent_hash]) { // Generator complete?

            $this->unsetTree($hash); // No more needed

            $result = $this->tree[$parent_hash];

            $parent->send($result);

            $this->updateGenerator($parent);

        }

    }

    /**

        $this->unsetTable($hash);

        $this->unsetTree($hash);

        $enqueued = $this->initialize($value, $parent_hash, $keylist);

        if (!$enqueued && $parent && !$this->value_to_children[$parent_hash]) { // Generator complete?

            // Traverse parent stack.

            $next = $this->tree[$parent_hash];

            $this->unsetTree($parent_hash);

            $parent->send($next);

            $this->updateGenerator($parent);

        }

    }

    /**