Worked on refining error reporting in the google/dawn repository, focusing on the WGSL validator and its integration with the Tint compiler. Addressed a specific issue where error messages for module-scope function calls were unclear, updating them to accurately distinguish between user-declared and built-in functions. This change improved developer guidance and reduced confusion during debugging. The work involved careful attention to language specification and error handling, ensuring that repository conventions were maintained and that valid module-scope usage remained unaffected. Utilized C++ for compiler development tasks, demonstrating a methodical approach to enhancing error messaging without introducing new features or altering core functionality.