{"ast_node_type":"other","tokens":[{"end":51,"kind":"keyword","start":0,"text":"ty::BoundRegionKind::Anon"}]}
            ty::BoundRegionKind::Anon => sym::anon,
        let reg_info = match placeholder.bound.kind {
            ty::BoundRegionKind::Named(def_id) => self.type_checker.tcx().item_name(def_id),