{"ast_node_type":"other","tokens":[{"end":98,"kind":"keyword","start":0,"text":"ty::ClauseKind::RegionOutlives(ty::OutlivesPredicate(r1,"}]}
                        ty::ClauseKind::RegionOutlives(ty::OutlivesPredicate(r1, r2)).upcast(tcx);
                    let pred =
                    (pred, span)