https://gcc.gnu.org/bugzilla/show_bug.cgi?id=126036
--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Another possibility would be to refuse to constant evaluate such metafunctions
when processing_template_decl.
Looking at the 3 finish_compound_literal calls, the first one is for some cases
of reflect_constant_array (with zero size), the second one already has:
/* Don't throw in a template. */
if (processing_template_decl)
{
*non_constant_p = true;
return NULL_TREE;
}
and the last one is for all functions which return vector <info>.
