don't understand for a package

[Yonghua Peng]

 Hello members,

I run this command to install Starman webserver working along with Dancer.

$ sudo cpanm Starman

This run successfully.
Then I take a look at the source of Starman, found it has only 6 lines code:

package Starman;

use strict;
use 5.008_001;
our $VERSION = '0.4009';

1;
__END__ (see  
http://cpansearch.perl.org/src/MIYAGAWA/Starman-0.4009/lib/Starman.pm )

How a Starman webserver can run with this nothing actual code?

Thanks.