{"ast_node_type":"other","tokens":[{"end":95,"kind":"keyword","start":0,"text":"CanonicalVarKind::PlaceholderRegion(ty::PlaceholderRegion"}]}
            CanonicalVarKind::PlaceholderRegion(ty::PlaceholderRegion { universe, bound }) => {
                let universe_mapped = universe_map(universe);