"Error in optimizer" says Hilfe; it is right

Imported from http://bugzilla.roxen.com/bugzilla/show_bug.cgi?id=106

Reported by Martin Nilsson, IDA nilsson@pike.ida.liu.se

Pike v7.1 release 5 running Hilfe v2.0 (Incremental Pike Frontend)
> Calendar.dwim_day;
Result: dwim_day
Error in optimizer.
bash-2.03$