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-rw-r--r--clang/unittests/Serialization/SourceLocationEncodingTest.cpp1
1 files changed, 1 insertions, 0 deletions
diff --git a/clang/unittests/Serialization/SourceLocationEncodingTest.cpp b/clang/unittests/Serialization/SourceLocationEncodingTest.cpp
index f33a909..d32e242 100644
--- a/clang/unittests/Serialization/SourceLocationEncodingTest.cpp
+++ b/clang/unittests/Serialization/SourceLocationEncodingTest.cpp
@@ -10,6 +10,7 @@
#include "gtest/gtest.h"
#include <climits>
+#include <optional>
using namespace llvm;
using namespace clang;