{"ast_node_type":"variable","tokens":[{"end":55,"kind":"keyword","start":0,"text":"let"}]}
        let last_index = deduced_param_attrs.len() - 1;
    while deduced_param_attrs.last() == Some(&DeducedParamAttrs::default()) {
        deduced_param_attrs = &mut deduced_param_attrs[0..last_index];