{"ast_node_type":"variable","tokens":[{"end":55,"kind":"keyword","start":0,"text":"let"}]}
    let mut blocks = IndexVec::with_capacity(n_blocks);
    let n_blocks = if let Some(Adjustment::RefMut) = rcvr_adjustment { 5 } else { 2 };
    let block = |blocks: &mut IndexVec<_, _>, statements, kind, is_cleanup| {