efriedma added inline comments.

================
Comment at: clang/lib/Headers/stddef.h:112
 #if defined(_MSC_EXTENSIONS) && defined(_NATIVE_NULLPTR_SUPPORTED)
-namespace std { typedef decltype(nullptr) nullptr_t; }
-using ::std::nullptr_t;
+// __need_NULL would previously define nullptr_t for C++, add it here.
+#define __need_nullptr_t
----------------
I think this code was pulled into the `__need_NULL` conditional by accident; I 
doubt anyone actually depends on the precise interaction here.  Just move to 
the same place as the other `__need_` defines.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D157757/new/

https://reviews.llvm.org/D157757

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