> Hi!
>
> I saw that there's a __has_feature() for objc_generics and objc_kindof, however, there doesn't seem to be objc_nullability or similar. Since the sources for the Clang from Xcode 7 haven't been released, I grepped through `strings clang`, however, I could not find anything useful.
>
> What is the best way to check if the compiler supports nullability, so that if not I can #define nonnull and friends to nothing?
>
> PS: I also found objc_generics_variance - what's that?
The feature test for the "covariant" and "contravariant" annotations.
John.
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