$ perl5.12.2 -we'use Switch'
Switch will be removed from the Perl core distribution in the next major release. Please install it from CPAN. It is being used at -e, line 1.
$

##</code><code>##

$ perl5.14.0 -we'use Switch'
Can't locate Switch.pm in @INC (@INC contains: /media/Tux/perls/lib/site_perl/5.14.0/i686-linux-64int /media/Tux/perls/lib/site_perl/5.14.0 /media/Tux/perls/lib/5.14.0/i686-linux-64int /media/Tux/perls/lib/5.14.0 .) at -e line 1.
BEGIN failed--compilation aborted at -e line 1.
$