{"ast_node_type":"other","tokens":[{"end":79,"kind":"keyword","start":0,"text":"debug!(\"get_field_candidates(span:"}]}
        debug!("get_field_candidates(span: {:?}, base_t: {:?}", span, base_ty);
    ) -> Vec<(Vec<&'tcx ty::FieldDef>, GenericArgsRef<'tcx>)> {