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-rw-r--r--clang/unittests/Tooling/TransformerTest.cpp1
1 files changed, 1 insertions, 0 deletions
diff --git a/clang/unittests/Tooling/TransformerTest.cpp b/clang/unittests/Tooling/TransformerTest.cpp
index 4d5e22d94498..8d10f388b4ac 100644
--- a/clang/unittests/Tooling/TransformerTest.cpp
+++ b/clang/unittests/Tooling/TransformerTest.cpp
@@ -17,6 +17,7 @@
#include "llvm/Support/Error.h"
#include "gmock/gmock.h"
#include "gtest/gtest.h"
+#include <optional>
using namespace clang;
using namespace tooling;