Modern Perl programs use several modules to enable additional features of
 Perl and of the CPAN. Instead of copying and pasting all of these 'use'
 lines, instead write only one:
 .
    use Modern::Perl;
 .
 This enables the strict and warnings pragmas, as well as all of the features
 available since Perl 5.10.
 .
 For enabling features of newer Perl releases, a year can be specified as an
 import tag, e.g.:
 .
    use Modern::Perl '2017';
 .
 enables 5.24 features. Cf. Modern::Perl(3pm) for details.
 .
 See http://www.modernperlbooks.com/mt/2009/01/toward-a-modernperl.html for
 more information, http://www.modernperlbooks.com/ for further discussion of
 Modern Perl and its implications, and
 http://onyxneon.com/books/modern_perl/index.html for a freely-downloadable
 Modern Perl tutorial.
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