bad_optional_access is now in libc++.dylib on 10.13 -- headers out of date?


> #  define _LIBCPP_AVAILABILITY_BAD_OPTIONAL_ACCESS                             \
>      __attribute__((availability(macosx,strict,introduced=10.14)))             \
>      __attribute__((availability(ios,strict,introduced=12.0)))                 \
>      __attribute__((availability(tvos,strict,introduced=12.0)))                \
>      __attribute__((availability(watchos,strict,introduced=5.0)


I went ahead and patched our installed __config header to change this to introduced 10.13.

Ken