http://public.activestate.com/cgi-bin/perlbrowse/p/30608 Note that the change has: # study $DATA This test/patch came via [perl #41831] (problem was also reported as [perl #36984]), but the test/patch has: study $DATA Does someone remember why the study was commented? The bug only manifested itself if study was used. So basically, the change is (I believe) one big no-op since it does not fully test what it should be testing. A patch that restores study $DATA is attached. Kind regards, Bram