efriedma added inline comments.

================
Comment at: clang/test/Headers/stddef.c:20-23
+// rsize_t will only be defined if __STDC_WANT_LIB_EXT1__ is set to >= 1.
+// It would be nice to test the default undefined behavior, but that emits
+// a note coming from stddef.h "rsize_t, did you mean size_t?" that can't be
+// `c99-note`d away.
----------------
iana wrote:
> Does anyone know a trick to catch the note from stddef.h?
I think the syntax is something like `expected-warning@stddef.h:10`?  See 
rGfcc699ae ,  There's also a wildcard syntax; see rG05eedf1f.


Repository:
  rG LLVM Github Monorepo

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

https://reviews.llvm.org/D157757

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