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package emonitor;
require Exporter;
# snip for post brevity
...

    my($cfg, $hosts_r, $ow) = @_;
    bless($cfg, 'configthing');  ## <-- this is line 190

use strict;
use warnings;
use configthing qw();
our configthing $cfg = new configthing;
emonitor::list_hosts($cfg, \@hosts);