Man pages matching name class::c3::xs in section 3pm:

Class::C3::XS.3pm.en	debian 10 / libclass-c3-xs-perl
Class::C3::XS.3pm.en	debian 11 / libclass-c3-xs-perl
Class::C3::XS.3pm.en	debian 12 / libclass-c3-xs-perl