More interestingly, "make verify" signals a lot of sscanf format errors in the Calendar module. Did you accidentally break something with your last change?
ariel:7.7 $ pike Pike v7.4 release 464 running Hilfe v3.5 (Incremental Pike Frontend)
Calendar.ISO.dwim_day("2008-05-14");
(1) Result: Day(Wed 14 May 2008) Terminal closed. ariel:7.7 $ ./bin/pike Pike v7.7 release 45 running Hilfe v3.5 (Incremental Pike Frontend)
Calendar.ISO.dwim_day("2008-05-14");
Error in sscanf format string. lib/modules/Calendar.pmod/YMD.pike:2714: ISO->parse("%y-%M-%D (%*s) -W%W-%e (%e)%n","2008-05-14",UNDEFINED) lib/modules/Calendar.pmod/YMD.pike:2990:ISO->dwim_day("2008-05-14",UNDEFINED)