I am not entirely sure if I understand your question correctly.
You seem to indicate that if you give the above code to perl -MXML::DOM -e, then it ceases to compile. If this is the case, then I can not reproduce this on Debian Linux testing, Perl 5.8.4. Yet, if this is the case, then I pretty much recommend you reporting this at the perl-xml mailinglist (Perl-XML <at> listserv.ActiveState.com). I have got some really useful tips there in the past with similar problems.
On the other hand, if you mean that your code crashes when it gets to executing removeChild(), neither this I can reproduce on Linux, so it must be the first case...
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