{"ast_node_type":"variable","tokens":[{"end":84,"kind":"keyword","start":0,"text":"let"}]}
                let lifetime_params = generic_params.iter_lt().map(|(local_id, _)| {
                let generic_params = db.generic_params(parent);
                    GenericParamId::LifetimeParamId(LifetimeParamId { parent, local_id })