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-rw-r--r--clang/lib/AST/FormatString.cpp1
1 files changed, 1 insertions, 0 deletions
diff --git a/clang/lib/AST/FormatString.cpp b/clang/lib/AST/FormatString.cpp
index 4da1fb8..3e6d45b 100644
--- a/clang/lib/AST/FormatString.cpp
+++ b/clang/lib/AST/FormatString.cpp
@@ -15,6 +15,7 @@
#include "clang/Basic/LangOptions.h"
#include "clang/Basic/TargetInfo.h"
#include "llvm/Support/ConvertUTF.h"
+#include <optional>
using clang::analyze_format_string::ArgType;
using clang::analyze_format_string::FormatStringHandler;