Please add a nicer way to return errors

QExpected<QByteArray, QString> readFile(const QString &path)
{
    QFile file(path);
    if (!file.open(QIODevice::ReadOnly)) {
        return qUnexpected(file.errorString());
    }
    auto result = file.readAll();    
    if (file.error() != QFileDevice::NoError) {        
        return qUnexpected(file.errorString());   
    }
    return result;
}

auto result = readFile(path);
if (result) {
    qDebug() << result.value();
} else {
    qDebug() << result.error();
}