title: In Perl, how do I put multiple packages in a single .pm file?
body: <p>I'm pretty sure that I read somewhere that it's possible, but there are a few gotchas that you need to be aware of. Unfortunately, I can't find the tutorial or page that described what you need to do. I looked through the <a href="http://perldoc.perl.org/index-tutorials.html" rel="noreferrer">Perl tutorials</a>, and didn't find the one that I remember reading. Could someone point me to a page or document that describes how to put multiple packages into a single .pm file?</p>