QFont crash with Qt 5

[wssddc]

I get a crash in dynamic initializer for foo with:

@#include <QApplication>
#include <QFont>
QFont foo;

int main(int argc, char *argv[])
{
return 0;
}
@

Help tells me that "a QGuiApplication instance must exist before a QFont can be used." Am I violating this rule just by declaring foo? This worked in Qt 4.

Windows 7, Qt 5.0.0, MS VC++ 2010, 32-bit.