Man pages matching name tree::simple::visitor::getalldescendents in section 3pm:

Tree::Simple::Visitor::GetAllDescendents.3pm.en	debian 10 / libtree-simple-visitorfactory-perl
Tree::Simple::Visitor::GetAllDescendents.3pm.en	debian 11 / libtree-simple-visitorfactory-perl
Tree::Simple::Visitor::GetAllDescendents.3pm.en	debian 12 / libtree-simple-visitorfactory-perl