Faills with NullPointerException when there's fallthrough

[JD557]

The following piece of code makes bindgen fail with a null pointer exception:

https://github.com/libsdl-org/SDL/blob/SDL2/include/SDL_stdinc.h#L525-L551

From what I can tell, the problem seems to be with the SDL_FALLTHROUGH (https://github.com/libsdl-org/SDL/blob/SDL2/include/begin_code.h#L170-L189), but this is a bit hard to debug.

Not sure if the problem is with Clang, but maybe there could be a better error message, at least?
The workaround is pretty simple: just delete the method body and run the bindgen again.

Tested in v0.0.20 (sn-bindgen-x86_64-pc-win32)

Stack trace:

java.lang.NullPointerException
        at <none>.(Unknown Source)
        at <none>.(Unknown Source)
        at <none>.(Unknown Source)
        at <none>.(Unknown Source)
        at <none>.(Unknown Source)
        at <none>.(Unknown Source)
        at <none>.(Unknown Source)
        at <none>.(Unknown Source)
        at <none>.(Unknown Source)
        at <none>.(Unknown Source)
        at <none>.(Unknown Source)
        at <none>.clang_isTranslationUnit(Unknown Source)
        at <none>.clang_isStatement(Unknown Source)
        at <none>.clang_isDeclaration(Unknown Source)
        at <none>.clang_disposeTranslationUnit(Unknown Source)
        at <none>.clang_isTranslationUnit(Unknown Source)
        at <none>.clang_isDeclaration(Unknown Source)
        at <none>.clang_disposeTranslationUnit(Unknown Source)
        at <none>.clang_isTranslationUnit(Unknown Source)
        at <none>.clang_isTranslationUnit(Unknown Source)
        at <none>.clang_isDeclaration(Unknown Source)
        at <none>.clang_visitChildren(Unknown Source)
        at <none>.clang_visitChildren(Unknown Source)
        at <none>.clang_visitChildren(Unknown Source)
        at <none>.clang_visitChildren(Unknown Source)
        at <none>.clang_visitChildren(Unknown Source)
        at <none>.(Unknown Source)
        at <none>.clang_visitChildren(Unknown Source)
        at <none>.clang_visitChildren(Unknown Source)
        at <none>.BaseThreadInitThunk(Unknown Source)
        at <none>.RtlUserThreadStart(Unknown Source)