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($formatted_users,$error) = &format_output($users);
defined($error) && &fatal_error($error); 
        #logging/feedback to user

$formatted_users = &format_output(&get_users($fh));

($formatted_users = &format_output(&get_users($fh))) 
    || &fatal_error("something went wrong formatting the users");

($formatted_users = &format_output(&get_users($fh))) 
    || &fatal_error($ERR);

&user_delete || &fatal_error($user::ERR->{message})