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-rw-r--r--clang/unittests/Tooling/RefactoringTest.cpp1
1 files changed, 1 insertions, 0 deletions
diff --git a/clang/unittests/Tooling/RefactoringTest.cpp b/clang/unittests/Tooling/RefactoringTest.cpp
index c7a02e1..2f3bd22 100644
--- a/clang/unittests/Tooling/RefactoringTest.cpp
+++ b/clang/unittests/Tooling/RefactoringTest.cpp
@@ -29,6 +29,7 @@
#include "llvm/ADT/SmallString.h"
#include "llvm/Support/VirtualFileSystem.h"
#include "gtest/gtest.h"
+#include <optional>
namespace clang {
namespace tooling {