lupdate confused by `final` specifier (C++11)

When running lupdate multiple warnings are generated with the text

Qualifying with unknown namespace/class ::ClassName

It turns out in this case that these are being caused by a class declaration in the header like so:

class ClassName final : public QObject

In one case where the class was declared with the `final` specifier in the source file, the warning generated was:

Class 'final' lacks Q_OBJECT macro

...in this case the class declaration was:

class CustomXmlHandler final : public QXmlDefaultHandler
...
Q_DECLARE_TR_FUNCTIONS( CustomXmlHandler )
...

I am not sure if lupdate even supports such declarations in a source file (vs header file) but in this case the warning still went away after removing the `final` specifier from the declaration.