{"ast_node_type":"variable","tokens":[{"end":47,"kind":"keyword","start":0,"text":"let"}]}
                    let param_def_id_to_index =
                    let own_params = generics.params_to(param_def_idx as usize, tcx).to_owned();
                        own_params.iter().map(|param| (param.def_id, param.index)).collect();