[jim@krakatoa perl]$ cat use23Skidoo.pl 
#!/usr/bin/perl -T

use 5.008_008;

use strict;
use warnings FATAL => 'all';

use 23Skidoo;

exit;

__END__
[jim@krakatoa perl]$ ./use23Skidoo.pl 
syntax error at ./use23Skidoo.pl line 8, near "use 23"
Execution of ./use23Skidoo.pl aborted due to compilation errors.
[jim@krakatoa perl]$