https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84582
--- Comment #4 from Marek Polacek <mpolacek at gcc dot gnu.org> --- ...with that we get the original ICE in PR84325 back: internal compiler error: unexpected expression ‘(const seconds){operator""_s<'1', '0'>()}’ of kind implicit_conv_expr constexpr static inline seconds time_to_wait{10_s}; so that's another bug that needs to be fixed while at this.