$curr = $head;
my $tail;

while ($curr) {
    $tail = { next => $tail,
              data => $curr->{data},
            };
    $curr = $curr->{next};
}

print Dumper $tail;


##</code><code>##

($q=q:Sq=~/;[c](.)(.)/;chr(-||-|5+lengthSq)`"S|oS2"`map{chr |+ord
}map{substrSq`S_+|`|}3E|-|`7**2-3:)=~y+S|`+$1,++print+eval$q,q,a,