{"ast_node_type":"variable","tokens":[{"end":65,"kind":"keyword","start":0,"text":"let"}]}
                let item_def_id = tcx.hir_ty_param_owner(def_id);
            Some(rbv::ResolvedArg::EarlyBound(def_id)) => {
                let generics = tcx.generics_of(item_def_id);