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use strict; ... yields: Can't call method "push_context" on an undefined value at /usr/lib/perl5/site_perl/5.6.0/XML/Filter/SAX1toSAX2.pm line 25.
use strict; ... yields: Not an ARRAY reference at /usr/lib/perl5/site_perl/5.6.0/XML/Filter/SAX2toSAX1.pm line 47.