{"ast_node_type":"other","tokens":[{"end":89,"kind":"keyword","start":0,"text":".extend(universal_regions.universal_regions_iter().map(PoloniusRegionVid::from));"}]}
        .extend(universal_regions.universal_regions_iter().map(PoloniusRegionVid::from));
        .universal_region
    let borrow_count = borrow_set.len();