use Strict;
use Warnings;

Just a word of warning. This code may not compile in the upcoming 5.10 release of Perl. It just depends how loudly perl complains.

From perl595delta:

Module changes
[...]
"strict" and "warnings"

"strict" and "warnings" will now complain loudly if they are loaded via incorrect casing (as in "use Strict;"). (Johan Vromans)