914 struct tm_format_checker : null_chrono_spec_handler<tm_format_checker> {  struct
915   FMT_NORETURN inline void unsupported() {  in unsupported()
920   FMT_CONSTEXPR void on_text(const Char*, const Char*) {}  in on_text()
921   FMT_CONSTEXPR void on_year(numeric_system, pad_type) {}  in on_year()
922   FMT_CONSTEXPR void on_short_year(numeric_system) {}  in on_short_year()
923   FMT_CONSTEXPR void on_offset_year() {}  in on_offset_year()
924   FMT_CONSTEXPR void on_century(numeric_system) {}  in on_century()
925   FMT_CONSTEXPR void on_iso_week_based_year() {}  in on_iso_week_based_year()
926   FMT_CONSTEXPR void on_iso_week_based_short_year() {}  in on_iso_week_based_short_year()
927   FMT_CONSTEXPR void on_abbr_weekday() {}  in on_abbr_weekday()
928   FMT_CONSTEXPR void on_full_weekday() {}  in on_full_weekday()
929   FMT_CONSTEXPR void on_dec0_weekday(numeric_system) {}  in on_dec0_weekday()
930   FMT_CONSTEXPR void on_dec1_weekday(numeric_system) {}  in on_dec1_weekday()
931   FMT_CONSTEXPR void on_abbr_month() {}  in on_abbr_month()
932   FMT_CONSTEXPR void on_full_month() {}  in on_full_month()
933   FMT_CONSTEXPR void on_dec_month(numeric_system, pad_type) {}  in on_dec_month()
934   FMT_CONSTEXPR void on_dec0_week_of_year(numeric_system, pad_type) {}  in on_dec0_week_of_year()
935   FMT_CONSTEXPR void on_dec1_week_of_year(numeric_system, pad_type) {}  in on_dec1_week_of_year()
936   FMT_CONSTEXPR void on_iso_week_of_year(numeric_system, pad_type) {}  in on_iso_week_of_year()
937   FMT_CONSTEXPR void on_day_of_year(pad_type) {}  in on_day_of_year()
938   FMT_CONSTEXPR void on_day_of_month(numeric_system, pad_type) {}  in on_day_of_month()
939   FMT_CONSTEXPR void on_24_hour(numeric_system, pad_type) {}  in on_24_hour()
940   FMT_CONSTEXPR void on_12_hour(numeric_system, pad_type) {}  in on_12_hour()
941   FMT_CONSTEXPR void on_minute(numeric_system, pad_type) {}  in on_minute()
942   FMT_CONSTEXPR void on_second(numeric_system, pad_type) {}  in on_second()
943   FMT_CONSTEXPR void on_datetime(numeric_system) {}  in on_datetime()
944   FMT_CONSTEXPR void on_loc_date(numeric_system) {}  in on_loc_date()
945   FMT_CONSTEXPR void on_loc_time(numeric_system) {}  in on_loc_time()
946   FMT_CONSTEXPR void on_us_date() {}  in on_us_date()
947   FMT_CONSTEXPR void on_iso_date() {}  in on_iso_date()
948   FMT_CONSTEXPR void on_12_hour_time() {}  in on_12_hour_time()
949   FMT_CONSTEXPR void on_24_hour_time() {}  in on_24_hour_time()
950   FMT_CONSTEXPR void on_iso_time() {}  in on_iso_time()
951   FMT_CONSTEXPR void on_am_pm() {}  in on_am_pm()
952   FMT_CONSTEXPR void on_utc_offset(numeric_system) {}  in on_utc_offset()
953   FMT_CONSTEXPR void on_tz_name() {}  in on_tz_name()