g++-5 errors out with this now with errors such as:
default_constructor_wrap.cxx:665:27: error: use of deleted function ‘FFF::FFF()’
result = (FFF *)new FFF();
^
default_constructor_wrap.cxx:314:7: note: ‘FFF::FFF()’ is implicitly deleted because the default definition would be ill-formed:
class FFF : public F {
^
default_constructor_wrap.cxx:301:4: error: ‘F::~F()’ is private
~F() { }
^
default_constructor_wrap.cxx:314:7: error: within this context
