{"ast_node_type":"other","tokens":[{"end":55,"kind":"keyword","start":0,"text":"ParamLoweringMode::Placeholder"}]}
                    ParamLoweringMode::Placeholder => {
                LifetimeNs::LifetimeParam(id) => match self.type_param_mode {
                        LifetimeData::Placeholder(lt_to_placeholder_idx(self.db, id))