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griotspeak

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Introducing Swift 12 years ago

That should actually be 'no implicit fallthrough'. You get fallthrough with the fallthrough keyword.

Consider also the possibility that Apple sponsored Clang/LLVM because was written in a way that made it nearly impossible to analyze code exactly as the compiler would. The separation of LLVM and Clang means that Static analyzer in clang is doing the same thing as when you compile.