In file included from /in/driver/main.cpp:8:0:
/in/kdtree.hpp: In member function 'KDTree<std::tuple<_Elements ...>, ValueType>::Node* KDTree<std::tuple<_Elements ...>, ValueType>::erase(KDTree<std::tuple<_Elements ...>, ValueType>::Node*, const Key&)':
/in/kdtree.hpp:323:31: error: 'a' was not declared in this scope
             if (std::get<DIM>(a) < std::get<DIM>(b)) node->left = erase<DIM_NEXT>(node->left,key);
                               ^
/in/kdtree.hpp:323:50: error: 'b' was not declared in this scope
             if (std::get<DIM>(a) < std::get<DIM>(b)) node->left = erase<DIM_NEXT>(node->left,key);
                                                  ^