I learned that:
the Perl program “ Illegal division by zero at/tmp/quine.pl line 1. ”, when saved in theappropriate location, outputs “ Illegaldivision by zero at /tmp/quine.plline 1.”I think there are a couple of neat examples there:
lerzfijglpFiji-j
-*?
also, the writing is quite entertaining.
It's not so much a feature as how really old versions of Perl worked. Any program using strict doesn't allow it unless it's a known subroutine name, built-in or other symbol.
Except in certain cases because back-compat is complicated.
It's the kind of joke that doesn't teach you anything, rather than the kind that does.