http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55993
--- Comment #8 from Marc Glisse <glisse at gcc dot gnu.org> 2013-01-15 19:38:46
UTC ---
(In reply to comment #7)
> e.cc:9:41: error: the value of 'd' is not usable in a constant expression
> constexpr auto g=static_cast<const B&>(d); // FAIL different
> ^
> e.cc:6:13: note: 'd' used in its own initializer
> constexpr D d;
> ^
Those are just because of the missing {} after the declaration of d, the
messages are not optimal, but forget my last comment.
It's just that the error is not exactly in the derived to base conversion but
trying to use that value afterwards.
