Calendar arithmetic multiple multiplication with integers doesn't work
Imported from http://bugzilla.roxen.com/bugzilla/show_bug.cgi?id=2226
Reported by Mirar , Idonex Heavy Industries mirar@roxen.com
> Calendar.dwim_day("010313")+Calendar.Day()*(6*30);
Result: Day(Sun 9 Sep 2001)
> Calendar.dwim_day("010313")+(Calendar.Day()*6)*30;
Result: Day(Mon 19 Mar 2001)
> (Calendar.Day()*6)*4711;
Result: Day(Fri 7 Sep 2001 .. Wed 12 Sep 2001)
> (Calendar.Day()*6)*-1;
Result: Day(Fri 7 Sep 2001 .. Wed 12 Sep 2001)