use Readonly PI => 3.141593;

##</code><code>##

Readonly version 3.14 required--this is only version 1.03 at C:/Perl/lib/Exporter/Heavy.pm line 121.
BEGIN failed--compilation aborted at mytest.pl line 5.
##</code><code>##

use Readonly;

Readonly my $PI => 3.141592654;

print "$PI\n";