Over two months, contributed to core Rust compiler development across rust-lang/rust and ferrocene/ferrocene, focusing on backend reliability, diagnostics, and type system enhancements. Delivered features such as improved trait system support for generic constant arguments and associated types, refined MIR lowering to prevent assignment errors, and enhanced ABI handling for function pointers. Addressed bugs in error reporting, async function diagnostics, and macro-expanded code suggestions, while strengthening documentation and CI tooling. Work emphasized robust error handling, regression testing, and cross-crate interoperability. Utilized Rust, TOML, and Markdown, applying skills in compiler design, backend development, and technical writing to improve developer experience.