{"ast_node_type":"other","tokens":[{"end":70,"kind":"keyword","start":0,"text":"CanonicalizeMode::Response"}]}
                CanonicalizeMode::Response { max_input_universe } => {
                CanonicalizeMode::Input(_) => CanonicalVarKind::Region(ty::UniverseIndex::ROOT),
                    // If we have a placeholder region inside of a query, it must be from