# Pastebin I812DMgn
❯ perl -v

This is perl 5, version 36, subversion 0 (v5.36.0) built for x86_64-linux-thread-multi

Copyright 1987-2022, Larry Wall

Perl may be copied only under the terms of either the Artistic License or the
GNU General Public License, which may be found in the Perl 5 source kit.

Complete documentation for Perl, including FAQ lists, should be found on
this system using "man perl" or "perldoc perl".  If you have access to the
Internet, point your browser at https://www.perl.org/, the Perl Home Page.

❯ cat t.pl
#!/usr/bin/perl

$var = "foobar";
print "$var\n";

❯ perl t.pl
foobar

❯ cat t.pl
#!/usr/bin/perl

use v5.12;

$var = "foobar";
print "$var\n";

❯ perl t.pl
Global symbol "$var" requires explicit package name (did you forget to declare "my $var"?) at t.pl line 5.
Global symbol "$var" requires explicit package name (did you forget to declare "my $var"?) at t.pl line 6.
Execution of t.pl aborted due to compilation errors.

❯ cat t.pl
#!/usr/bin/perl

use v5.30;

$var = "foobar";
print "$var\n";

❯ perl t.pl
Global symbol "$var" requires explicit package name (did you forget to declare "my $var"?) at t.pl line 5.
Global symbol "$var" requires explicit package name (did you forget to declare "my $var"?) at t.pl line 6.
Execution of t.pl aborted due to compilation errors.