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-rw-r--r--clang/lib/CrossTU/CrossTranslationUnit.cpp1
1 files changed, 1 insertions, 0 deletions
diff --git a/clang/lib/CrossTU/CrossTranslationUnit.cpp b/clang/lib/CrossTU/CrossTranslationUnit.cpp
index c4983ea7965f..a871eee5ac9d 100644
--- a/clang/lib/CrossTU/CrossTranslationUnit.cpp
+++ b/clang/lib/CrossTU/CrossTranslationUnit.cpp
@@ -30,6 +30,7 @@
#include "llvm/Support/raw_ostream.h"
#include <algorithm>
#include <fstream>
+#include <optional>
#include <sstream>
#include <tuple>