https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100102
--- Comment #14 from Jonathan Wakely <redi at gcc dot gnu.org> ---
cvised reproducer from PR 100448
template <bool> using __bool_constant struct intmax_t;
template <int, int> struct ratio {
template <class _Period> struct duration {
static intmax_t _S_gcd();
template <class>
using __is_harmonic =
__bool_constant<ratio<0, _Period(duration ::_S_gcd)>::den>;
class _Period2 __is_harmonic<_Period2>
