Worked on the swiftlang/swift-java repository to address a compatibility issue involving the AccessLevelMode enum’s @nonexhaustive attribute. Focused on compiler configuration, the developer updated the conditional compilation check to require compiler version 6.2.3 or higher, ensuring accurate compatibility and preventing potential miscompilation in downstream projects. The solution involved targeted changes in Swift, with thorough validation across affected compiler versions to maintain build integrity. All modifications were isolated to the relevant repository, and comprehensive documentation was provided to communicate the impact in release notes. This work demonstrated careful attention to compatibility and stability within the Swift compiler ecosystem.