{"ast_node_type":"other","tokens":[{"end":29,"kind":"keyword","start":0,"text":"Ok(nb)"}]}
            Ok(nb) => Ok(nb),
        Some(nb) if !nb.is_empty() => match usize::from_str(&nb) {
            Err(_) => Err(format!("Expected a number after `{option}`, found `{nb}`")),