================
@@ -0,0 +1,41 @@
+// RUN: %clang_cc1 -std=c17 -DPRE_C23 -fsyntax-only -verify -isystem %S/Inputs 
%s
+// RUN: %clang_cc1 -std=c23 -DPOST_C23 -fsyntax-only -verify -isystem 
%S/Inputs %s
+
+#include <stdarg.h>
+#include <stddef.h>
+
+int printf(const char *restrict, ...);
+
+#if PRE_C23
----------------
AaronBallman wrote:

> I did not know about those options. I will try to change the test to work 
> like that.

FWIW, we have some docs on this: 
https://clang.llvm.org/docs/InternalsManual.html#verifying-diagnostics

https://github.com/llvm/llvm-project/pull/126694
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