protected function validatePromptList($field, $label, $validator, $default = null)
    {
        $input = $this->prompt($label, $default);

        if ($this->isValidInput($this->explodeList($input), $field, $validator)) {
            $this->setSubmitted($field, $input);
        } else {
            $this->errors();
            $this->validatePromptList($field, $label, $validator, $default);
        }
    }