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constant - Perl pragma to declare constants

=head1 SYNOPSIS

    use constant BUFFER_SIZE	=> 4096;
    use constant ONE_YEAR	=> 365.2425 * 24 * 60 * 60;
    use constant PI		=> 4 * atan2 1, 1;
    use constant DEBUGGING	=> 0;
    use constant ORACLE		=> 'oracle@cs.indiana.edu';
    use constant USERNAME	=> scalar getpwuid($<);
    use constant USERINFO	=> getpwuid($<);

    sub deg2rad { PI * $_[0] / 180 }

    print "This line does nothing"		unless DEBUGGING;

    # references can be constants
    use constant CHASH		=> { foo => 42 };
    use constant CARRAY		=> [ 1,2,3,4 ];
    use constant CPSEUDOHASH	=> [ { foo => 1}, 42 ];
    use constant CCODE		=> sub { "bite $_[0]\n" };