Worked on the Chez Scheme compiler within the racket/racket repository, focusing on improving correctness in record constructor descriptor generation. Addressed a bug in the cp0 component by enforcing protocol constraints during record constructor definition, which prevents the creation of invalid descriptors and enhances compiler reliability. Updated the associated test suite to reflect the corrected behavior and ensure regression coverage, thereby reducing runtime risks. Utilized Scheme for both compiler development and testing, applying strong bug fixing skills to maintain code quality. The work demonstrated attention to detail in compiler internals and contributed to the stability of the Scheme programming environment.