swift

Kotlin 2.4.20, released September 7, maps sealed classes to Swift enums, adds new Kotlin/Wasm compilation modes, and ships a first experimental native compiler image.

Swift 6.4 is generally available, switching Swift Package Manager to the Swift Build backend by default and adding Subprocess 1.0, C++20 std::span interop, and faster WebAssembly bridging.

Doug Gregor detailed Embedded Swift additions landing ahead of Swift 6.4: broader `any` type support, untyped throws, and full metatype support.

Apple's second Swift release of the WWDC 2026 cycle leans on ergonomics and performance: async cleanup in defer, condensed availability syntax, and a for-in protocol that borrows noncopyable elements.

Swift 6.3 delivers the first stable Android SDK after a year of community development, alongside new C interoperability features and a unified cross-platform build system.