In noting your problem with re-using the same iterator on $rul over several, simultaneous calls to append(), give each call its own, separate hash and copy %$rul off before iterating over it. You then eliminate the interaction between recursive calls.

my %rul = %$rull;

while ( my ( $k, $v ) = each %rul ) {
    ...
}

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In reply to Re: Iterator Problem with recursion by diotalevi
in thread Iterator Problem with recursion by PetaMem

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