{"ast_node_type":"function","tokens":[{"end":85,"kind":"keyword","start":0,"text":"fn"}]}
    fn insert_late_bound_region(&mut self, r: ty::Region<'tcx>, vid: ty::RegionVid) {
    /// well. These are used for error reporting.
        debug!("insert_late_bound_region({:?}, {:?})", r, vid);