{"ast_node_type":"variable","tokens":[{"end":67,"kind":"keyword","start":0,"text":"let"}]}
        let num_digits = codegen_units.len().ilog10() as usize + 1;
        codegen_units.sort_by_key(|cgu| cmp::Reverse(cgu.size_estimate()));
        for (index, cgu) in codegen_units.iter_mut().enumerate() {