{"ast_node_type":"variable","tokens":[{"end":58,"kind":"keyword","start":0,"text":"let"}]}
    let mut res = [if is_negative { 255 } else { 0 }; 16];
    let is_negative = is_signed && it.last().unwrap_or(&0) > &127;
    res[..it.len()].copy_from_slice(it);