https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78701
Jakub Jelinek <jakub at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |jakub at gcc dot gnu.org --- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> --- Somehow convert_template_argument is called with TEMPLATE_PARM_INDEX, even when processing_template_decl is 0, which results in it not to be considered dependent, while the constexpr.c code doesn't expect it to appear.