A recent change in Perl 5 blead is causing HTML::Parser to experience CPANtesters failures.
See: Perl/perl5#23521 for the blead-breaks-CPAN report. The breaking commit noted that "uvuni_to_utf8() ... has been deprecated since 5.32, emitting a compiler warning if actually called (for most modern compilers)."
Sample failure report: https://www.cpantesters.org/cpan/report/0d68dfc6-6e6a-11f0-a679-b295fbe7d932
The relevant code is a single line in util.c.
$ ack uvuni_to_utf8 .
util.c
162: tmp = (char*)uvuni_to_utf8((U8*)buf, num);
Can you investigate? Thanks.