Worked on the swiftlang/swift-foundation repository to enhance macro expansion safety in Swift by addressing dynamic symbol lookup concerns. Focused on system programming and Swift Macros, the developer delivered a targeted bug fix that marked the Bundle(_dsoHandle:) call as unsafe within macro expansion paths. This adjustment, applied to both the main macro implementation and its associated tests, aimed to ensure correct handling of dynamic symbol resolution in dynamic linking scenarios. By improving test coverage for these cases, the work reduced the risk of incorrect symbol resolution and contributed to more reliable macro behavior across platforms, emphasizing robust and maintainable code practices.