{"ast_node_type":"other","tokens":[{"end":63,"kind":"keyword","start":0,"text":")"}]}
    ) -> Vec<(Vec<&'tcx ty::FieldDef>, GenericArgsRef<'tcx>)> {
        hir_id: HirId,
        debug!("get_field_candidates(span: {:?}, base_t: {:?}", span, base_ty);