Worked on improving diagnostic reporting for the software-mansion/cairols repository, focusing on enhancing the reliability and accuracy of Cairo language tooling. Addressed a key issue by removing the obsolete relative_span field from diagnostic structures and refining how diagnostic spans are handled, ensuring that original offsets are consistently applied. Updated the diagnostic system to compute and use relative text widths, which improved the precision of error reporting and reduced debugging time for downstream tools. Leveraged expertise in compiler development and Rust to coordinate these changes across the codebase, resulting in more stable and maintainable diagnostics for users of Cairo-based tools.