{"ast_node_type":"other","tokens":[{"end":67,"kind":"keyword","start":0,"text":"(ty::ReError(_),"}]}
                    (ty::ReError(_), _) | (_, ty::ReError(_)) => {}
                    ) => region_relation.add(r_a, r_b),
                    // FIXME(#109628): We shouldn't have existential variables in implied bounds.