loading of "Data::Dumper::Simple" or "Data::Dumper", depending on what the user has installed in their system. The "Data::Dumper" package is included with the Perl core installation. So at least "Data::Dumper" will work. The "Data::Dumper::Simple" module is very handy for debugging, and I deemed it important to use if it is available.
If "Data::Dumper" nor "Data::Dumper::Simple" is not your preference for variable structure representation, then you will have to load your own and use it to generate the debugging output desired.