These have existed for longer, but the names were changed.
@ -43,7 +43,7 @@
# define SERD_CONST_FUNC
#endif
#ifdef __clang__
#if defined(__clang__) && __clang_major__ >= 7
# define SERD_NONNULL _Nonnull
# define SERD_NULLABLE _Nullable
# define SERD_ALLOCATED _Null_unspecified