$options="(rw,insecure,async,root_squash) "
    $clients=lookup({name=> 'nfs_home_clients'})
    $exportline=""
    $clients.each | String $client | {
      $exportline = "${exportline}${client}${options}"
      notify {"client is ${client}": } # this works
    }
    notify {"exportline is ${exportline}": } # this returns ""