$ perl -MHTML::Tree -le " HTML::TreeBuilder->new_from_content( undef )"
Use of uninitialized value in subroutine entry at C:/citrusperl/site/lib/HTML/TreeBuilder.pm line 108.

$ perl -MCarp::Always -MHTML::Tree -le " HTML::TreeBuilder->new_from_content( undef )"
Use of uninitialized value in subroutine entry at C:/citrusperl/site/lib/HTML/TreeBuilder.pm line 108.
        HTML::TreeBuilder::new_from_content('HTML::TreeBuilder', undef) called at -e line 1