In the real world, I've found Perl scripts written in 1999 (and poorly - as they were written by me in my teens) will still run in 2019. It's basically the poli

In the real world, I've found Perl scripts written in 1999 (and poorly - as they were written by me in my teens) will still run in 2019. It's basically the policy that even language mistakes won't be undone: https://perldoc.perl.org/perlpolicy.html#BACKWARD-COMPATIBILITY-AND-DEPRECATION https://perldoc.perl.org/perlpolicy.html#BACKWARD-COMPATIBIL...