Using shift operator in enums not working

this kind of code worked fine in Qt 5.4 but doesn't compile in 5.5. Is that a bug or is there a reason that this isn't supposed to work?
I get an error: qt_getEnumMetaObject: none of the 5 overloads could convert all the argument types

Code:

---

#include <QCoreApplication>
#include <QDebug>
 
enum {
    test1 = 0
};
 
enum {
    sun = (1 << test1)
};
 
enum {
    bla = (1 << sun)
};
int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);
    qDebug() << "test";
    return a.exec();
}

---

That doesn't look Qt related at all.

Do you still get the problem if you have an empty main()?

Cheers,
_

The error looks Qt-related, but it almost certainly has nothing to do with the code that was posted.