{"ast_node_type":"variable","tokens":[{"end":93,"kind":"keyword","start":0,"text":"let"}]}
    let mut collector = KillsCollector { borrow_set, tcx, body, kills: BTreeMap::default() };
) -> BTreeMap<Location, BTreeSet<BorrowIndex>> {
    for (block, data) in body.basic_blocks.iter_enumerated() {