{"ast_node_type":"other","tokens":[{"end":46,"kind":"keyword","start":0,"text":"fields:"}]}
    fields: InternedSet<'tcx, List<FieldIdx>>,
    predefined_opaques_in_body: InternedSet<'tcx, PredefinedOpaquesData<TyCtxt<'tcx>>>,
    local_def_ids: InternedSet<'tcx, List<LocalDefId>>,