Man pages matching name tree::rb::node::_constants in section 3pm:

Tree::RB::Node::_Constants.3pm.en	debian 10 / libtree-rb-perl
Tree::RB::Node::_Constants.3pm.en	debian 11 / libtree-rb-perl
Tree::RB::Node::_Constants.3pm.en	debian 12 / libtree-rb-perl