{"ast_node_type":"other","tokens":[{"end":61,"kind":"keyword","start":0,"text":")"}]}
    ) -> Option<(Vec<OutlivesConstraint<'tcx>>, RegionVid)> {
        target_test: impl Fn(RegionVid) -> bool,
        let mut context = IndexVec::from_elem(Trace::NotVisited, &self.definitions);