{"ast_node_type":"other","tokens":[{"end":61,"kind":"keyword","start":0,"text":"///"}]}
    /// one (e.g., this is just some random part of the CFG).
    /// to find a good name from that. Returns `None` if we can't find
    pub(super) fn to_error_region(&self, r: RegionVid) -> Option<ty::Region<'tcx>> {