{"ast_node_type":"variable","tokens":[{"end":99,"kind":"keyword","start":0,"text":"let"}]}
        let Some(field_names) = listify(&fields[..], |(n, _, _)| format!("`{n}`")) else { return };
        // Get the list of all private fields for the main message.
        let span: MultiSpan = fields.iter().map(|(_, span, _)| *span).collect::<Vec<Span>>().into();