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-rw-r--r--clang/test/Lexer/cxx-features.cpp1
1 files changed, 1 insertions, 0 deletions
diff --git a/clang/test/Lexer/cxx-features.cpp b/clang/test/Lexer/cxx-features.cpp
index 6c4a092b1c4..b0f382ec253 100644
--- a/clang/test/Lexer/cxx-features.cpp
+++ b/clang/test/Lexer/cxx-features.cpp
@@ -6,6 +6,7 @@
// expected-no-diagnostics
+// FIXME using `defined` in a macro has undefined behavior.
#if __cplusplus < 201103L
#define check(macro, cxx98, cxx11, cxx1y) cxx98 == 0 ? defined(__cpp_##macro) : __cpp_##macro != cxx98
#elif __cplusplus < 201304L
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