} else if(cur->get_type() == lisp::Lisp::TYPE_CONS &&
cur->get_car()->get_type() == lisp::Lisp::TYPE_SYMBOL) {
const lisp::Lisp* ptr = cur->get_cdr();
} else if(cur->get_type() == lisp::Lisp::TYPE_CONS &&
cur->get_car()->get_type() == lisp::Lisp::TYPE_SYMBOL) {
const lisp::Lisp* ptr = cur->get_cdr();