/usr/share/doc/libvariable-magic-perl/examples/copy.pl is in libvariable-magic-perl 0.55-1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 | #!/usr/bin/perl
use strict;
use warnings;
use lib qw<blib/arch blib/lib>;
use Variable::Magic qw<wizard cast>;
use Tie::Hash;
my $wiz = wizard copy => sub { print STDERR "COPY $_[2] => $_[3]\n" },
free => sub { print STDERR "FREE\n" };
my %h;
tie %h, 'Tie::StdHash';
%h = (a => 1, b => 2);
cast %h, $wiz;
$h{b} = 3;
my $x = delete $h{b};
$x == 3 or die 'incorrect';
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