% /usr/bin/perl -v

This is perl, version 5.005_03 built for i386-freebsd

Copyright 1987-1999, Larry Wall
[...]
% cat c1
#! /usr/bin/perl -wl

use strict;
use constant C => 1;
use constant A => [qw/a b/];
use constant H => {qw/a b/};
print C;
print A;
print A->[0];
print H;
print H->{a};
% /usr/bin/perl c1
1
ARRAY(0x8057c18)
a
HASH(0x8057c3c)
b