use lib '/home/username/testmodules/';
use strict;
use warnings;
use My::Util;

my x = get_file_name( ... );


##</code><code>##


package My::Util;

use strict;
use warnings;
use Exporter;
our @ISA = qw(Exporter);
our @EXPORT = qw( get_file_name );

__END__
sub get_file_name {
	...
}

1;


##</code><code>##

Undefined subroutine &My::Util::get_file_name called