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› perl -c pm-11102847.pl
Global symbol "$co" requires explicit package name (did you forget to 
+declare "my $co"?) at pm-11102847.pl line 21.

use File::Compare qw(compare);
my $r = compare 'filename1', 'filename2';
...
} else {
    die "error in comparison: $!";
}

use Digest::MD5 qw(md5);
use File::Slurper qw(read_binary);
...
} else {
    print 'different';
}