https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84684
--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Jakub Jelinek from comment #3)
> the errors go away. Or if I remove int main () { and }, i.e. keep the
> static_asserts at the toplevel, it fails, but in different spots than when
> it is in main.
Yes, that's what made me suspect something uninitialized and try valgrind.
