Gary worked on the quarylabs/sqruff repository, focusing on resolving a SQL comment insertion integrity issue that previously caused comments to merge with code, breaking SQL syntax. He reinforced the AST-based insertion logic in Rust to ensure comments are placed after the correct segment, preserving both syntax and formatting. By adding targeted tests and aligning insertion points with AST tree levels, Gary improved the reliability of the code linting and formatting workflow. His work with Rust and SQL enhanced maintainability and reduced the risk of future regressions, delivering measurable improvements in debugging speed and overall workflow accuracy for the project.