lupdate can not parse enum class forward declaration with underlying type

 #include <QWidget>

enum class EnumClassForwardDeclarationWithUnderlyingType : int;

class SomeWidget : public QWidget

{ Q_OBJECT public: explicit SomeWidget(); }

;

void SomeWidget::SomeWidget()

{ tr("foo"); }

 lupdate lupdate.cpp 
 lupdate warning: no TS files specified. Only diagnostics will be produced.
 /tmp/lupdate.cpp:14: Qualifying with unknown namespace/class ::SomeWidget

 #define TAGEDITOR_ENUM_CLASS enum class
 namespace TagParser

{ TAGEDITOR_ENUM_CLASS TagType : unsigned int; }

// namespace TagParser
 #undef TAGEDITOR_ENUM_CLASS