Non-trivial "using namespace" confuses lupdate

#include <QObject>

namespace Foo { namespace Internal { } }

using namespace Foo::Internal;

namespace Foo {
namespace Internal {

class Test : public QObject
{
    Q_OBJECT
public:
    explicit Test(QObject *parent = nullptr);
};

} // namespace Internal

Test::Test(QObject *parent) : QObject(parent)
{
    auto foo = tr("Blah");
}

} // namespace Foo

#include "test.moc"