C:\>perl -MO=Deparse,-p -e"open F, $f or die $!"
(open(F, $f) or die($!));
-e syntax OK

C:\>perl -MO=Deparse,-p -e"open F, $f || die $!"
open(F, ($f || die($!)));
-e syntax OK

C:\>perl -MO=Deparse,-p -e"open(F, $f) || die $!"
(open(F, $f) or die($!));
-e syntax OK

C:\>perl -MO=Deparse,-p -e"open(F, $f) or die $!"
(open(F, $f) or die($!));
-e syntax OK