You need to wrap the data from the current element in each step, not the whole element: 
$curr = $head;
my $tail;

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

print Dumper $tail;

[download]
($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,

[download]

In reply to Re: Reversing a singly linked list by choroba
in thread Reversing a singly linked list by punitpawar

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