[Bug c++/57480] struct with a va_list considered as non-POD

[redi at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57480

--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Surely this depends on whether is_pod<va_list> is true, and is that required,
or is it unspecified?

I think this should always pass though:

static_assert(is_pod<fiber>::value == is_pod<va_list>::value, "same PODness");