================
@@ -0,0 +1,33 @@
+// RUN: %clang_cc1 -fsyntax-only -verify=expected,cxx11 -pedantic -std=c++11 %s
+// RUN: %clang_cc1 -fsyntax-only -verify=expected,cxx14 -pedantic -std=c++14 %s
+// RUN: %clang_cc1 -fsyntax-only -verify=expected,cxx17 -pedantic -std=c++17 %s
+// RUN: %clang_cc1 -fsyntax-only -verify=expected,cxx20 -pedantic -std=c++20 %s
+// RUN: %clang_cc1 -fsyntax-only -verify=expected,cxx23 -pedantic -std=c++23 %s
+// RUN: %clang_cc1 -fsyntax-only -verify=expected,cxx26 -pedantic -std=c++26 %s
+
+#define noreturn 1 // cxx11-warning {{keyword is hidden by macro
definition}}
----------------
AaronBallman wrote:
Please also add test cases for `#undef` of the name when it's not currently
defined as a macro, as that's also undefined behavior. (@ldionne @jwakely any
interest in an LWG issue over this? It's harmless to do `#undef noreturn` or
whatever because these identifiers aren't macros to begin with; and if they
were, the user hit the UB already.)
https://github.com/llvm/llvm-project/pull/106036
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