{"ast_node_type":"variable","tokens":[{"end":61,"kind":"keyword","start":0,"text":"let"}]}
                let universe_mapped = universe_map(universe);
            CanonicalVarKind::PlaceholderRegion(ty::PlaceholderRegion { universe, bound }) => {
                let placeholder_mapped = ty::PlaceholderRegion { universe: universe_mapped, bound };