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use Module 1.23;

$ perl -e'use Carp 100 ()'
Carp version 100 required--this is only version 1.26 at -e line 1.
...
$ perl -e'use Carp () => 100'
Carp version 100 required--this is only version 1.26 at /home/tai/perl
+5/perlbrew/perls/perl-5.16.2/lib/5.16.2/Exporter/Heavy.pm line 120.
BEGIN failed--compilation aborted at -e line 1.

use Readonly my $unprintable => 0x15;

use Readonly undef => 0x15;