use constant is_perl55 => ($] < 5.005_50);
use constant is_perl56 => ($] < 5.007 && $] > 5.005_50);
use constant is_sane_perl => $] > 5.007;

##</code><code>##

use constant 'is_perl55' => ($] < 5.005_50);
use constant 'is_perl56' => ($] < 5.007 && $] > 5.005_50);
use constant 'is_sane_perl' => $] > 5.007;