{"ast_node_type":"variable","tokens":[{"end":94,"kind":"keyword","start":0,"text":"let"}]}
                    let param_def_idx = generics.param_def_id_to_index[&param_id.to_def_id()];
                    let generics = tcx.generics_of(parent_did);
                    // In the above example this would be .params[..N#0]