During their work on the rust-lang/rust repository, the developer created a safety-focused lint to prevent unsafe binders in foreign function interfaces, addressing a key source of undefined behavior in Rust’s FFI usage. They implemented this feature using Rust, applying compiler development and linting expertise to ensure the lint integrated smoothly with existing improper_ctypes checks. Automated tests were developed to validate both the lint’s behavior and its error reporting, which improved CI coverage and reliability. This contribution enhanced the maintainability and consistency of the codebase, reducing runtime defects and strengthening Rust’s safety guarantees in cross-language integrations over the course of the month.