Before: perl5.31.2: op.c:1921: Perl_scalar: Assertion `0' failed. "0" isn't very descriptive. After: perl5.31.2: op.c:1921: Perl_scalar: Assertion `!"UNREACHABLE"' failed. A little more helpful as it immediately reminds you this is an unreachable statement that was reached. -- Paul "LeoNerd" Evans leonerd@leonerd.org.uk | https://metacpan.org/author/PEVANS http://www.leonerd.org.uk/ | https://www.tindie.com/stores/leonerd/