qwurx [shmem] ~ > perl  -le 'use overload "+" => \&add; print "$_ => $INC{$_}" for sort keys %INC'
Carp.pm => /usr/lib/perl5/5.8.8/Carp.pm
Exporter.pm => /usr/lib/perl5/5.8.8/Exporter.pm
overload.pm => /usr/lib/perl5/5.8.8/overload.pm
warnings.pm => /usr/lib/perl5/5.8.8/warnings.pm
warnings/register.pm => /usr/lib/perl5/5.8.8/warnings/register.pm