in reply to Re^2: constant variable using scaler variable
in thread constant variable using scaler variable

How about: 
$ perl -l
use strict;
use warnings;

use constant ERR => "Error in program";

sub func {
   return ERR;
}

print func();

__END__
Error in program

[download]
--
No matter how great and destructive your problems may seem now, remember, you've probably only seen the tip of them. [1]

In Section Seekers of Perl Wisdom