{"ast_node_type":"other","tokens":[{"end":55,"kind":"keyword","start":0,"text":"cov_mark::hit!(no_missing_fields_tuple_struct);"}]}
        cov_mark::hit!(no_missing_fields_tuple_struct);
    if fields.len().saturating_sub(prefix_count).saturating_sub(suffix_count) == 0 {
        return None;