$ cat t.pl
#! /usr/bin/perl
use strict;
use warnings;
use Data::Dumper;

my $code = sub { print "hallo @_\n"; };

print Dumper($code);
printf "v%vd\n", $^V;
$code->("Welt");
__END__

$ perl t.pl
$VAR1 = sub { "DUMMY" };
v5.8.8
hallo Welt
$