Worked on enhancing the reliability of the Prism parser within the ruby/ruby repository by addressing a critical stability issue. Focused on C programming and parser development, the work involved identifying and fixing a bug that caused segmentation faults when the parser encountered malformed shebang lines. The solution implemented a validation step to ensure the options pointer was checked before access, effectively preventing crashes in edge cases involving invalid script headers. This targeted bug fix improved the parser’s robustness and script processing stability. The contribution demonstrated careful attention to defensive programming and a methodical approach to bug fixing in a complex codebase.