Perl::Critic::Policy::Variables::ProhibitPerl4PackageNames - Use double colon (::) to separate package name components instead of single quotes (').
This Policy is part of the core Perl::Critic distribution.
Perl 5 kept single quotes (') as package component separators in order to remain backward compatible with prior perls, but advocated using double colon (::) instead. In the more than a decade since Perl 5, double colons have been overwhelmingly adopted and most people are not even aware that the single quote can be used in this manner. So, unless you're trying to obfuscate your code, don't use them.
package Foo::Bar::Baz; #ok
package Foo'Bar'Baz; #not ok
This Policy is not configurable except for the standard options.
Elliot Shank <firstname.lastname@example.org>
Copyright (c) 2007-2014 Elliot Shank.
This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself. The full text of this license can be found in the LICENSE file included with this module.
To install Perl::Critic, copy and paste the appropriate command in to your terminal.
perl -MCPAN -e shell
For more information on module installation, please visit the detailed CPAN module installation guide.