Swift 6.3 has been released with several notable improvements. The Android SDK is now officially stable, enabling developers to build native Android apps in Swift and integrate Swift code into Kotlin/Java projects. C interoperability is significantly enhanced via new @c and @implementation attributes, allowing Swift functions to be exposed to C/C++ code and vice versa. Module selectors resolve symbol ambiguity across imported modules. The new weak let declaration enables concurrency-safe weak references in closures. Developers also gain finer-grained compiler control through @specialize and @inline(always). Embedded Swift advances with a unified linking model, improved debugging, and memory-mapped I/O support via Swift MMIO.
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