{"ast_node_type":"other","tokens":[{"end":55,"kind":"keyword","start":0,"text":"#[instrument(level"}]}
    #[instrument(level = "debug", skip(self, t2), ret)]
    fn tys(&mut self, t: Ty<'tcx>, t2: Ty<'tcx>) -> RelateResult<'tcx, Ty<'tcx>> {