https://gcc.gnu.org/bugzilla/show_bug.cgi?id=125649
--- Comment #3 from Marek Polacek <mpolacek at gcc dot gnu.org> --- invalid_tparm_referent_p gets: (gdb) p decl $1 = <var_decl 0x7fffe4a3c000 heap > Perhaps the assert should also accept DECL_ARTIFICIAL.
