src/DataLoader.php
private function failedDispatch($queue, \Exception $error)
    {
        foreach ($queue as $index => $data) {
            $this->clear($data['key']);
            $data['reject']($error);
        }
    }
private function failedDispatch($queue, \Exception $error)
    {
        foreach ($queue as $index => $data) {
            $this->clear($data['key']);
            $data['reject']($error);
        }
    }
Do not cache individual loads if the entire batch dispatch fails,
but still reject each request so they do not hang.
@param array      $queue
@param \Exception $error