http://www.perlmonks.org?node_id=493875


in reply to Perl Version Change - Detecting Problems in Advance

I would install the new Perl as a separate Perl (say, in a different directory tree), and run the scripts with both Perls and compare the output. Of course you will need to have two database instances if your scripts use a database for that, and you will also need to duplicate all other resources that get consumed by your scripts.