QJSEngine::evaluate documentation could have an example how to get properties of an error object

Properties lineNumber, message and fileName could be queried from returned value. Those do not seem to be documented anywhere.
http://doc.qt.io/qt-5/qjsengine.html#evaluate

For example:

QJSvalue error = ..
qDebug() << v.property("fileName").toString() << v.property("lineNumber").toInt() << v.property("message").toString();