D:\>perl -V:useperlio
$Config::AUTOLOAD: Config::fetch_string
$INC{$config_heavy}: E:/Perl817/lib/Config_heavy.pl
$Config::AUTOLOAD: Config::launcher
$INC{$config_heavy}: E:/Perl817/lib/Config_heavy.pl
$Config::AUTOLOAD: Config::launcher
$INC{$config_heavy}: E:/Perl817/lib/Config_heavy.pl
&Config::AUTOLOAD failed on Config::launcher at E:/Perl817/lib/Config.pm line 73.