On CPAN the use of (?{}) is called "highly experimental"

It works for perl 5.6 on both Linux and DEC/OSF, though. So, I guess it was a bug in the 5.005 release.

I guess you have to upgrade or just have to go with the more simple and boring:

use strict;
for ("a","b","c")
{
        print $_ . "\n---\n";
} # ;-)
[download]

- Good luck