tzlookup          353 src/timefns.c    tzlookup (tz ? build_string (tz) : Qwall, true);
tzlookup         1349 src/timefns.c    timezone_t tz = tzlookup (zone, false);
tzlookup         1524 src/timefns.c    timezone_t tz = tzlookup (zone, false);
tzlookup         1722 src/timefns.c    timezone_t tz = tzlookup (zone, false);
tzlookup         1836 src/timefns.c    timezone_t tz = tzlookup (zone, false);
tzlookup         1942 src/timefns.c    tzlookup (NILP (tz) ? Qwall : tz, true);