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-rw-r--r--clang/lib/Parse/ParseDeclCXX.cpp1
1 files changed, 1 insertions, 0 deletions
diff --git a/clang/lib/Parse/ParseDeclCXX.cpp b/clang/lib/Parse/ParseDeclCXX.cpp
index 6fbf80436011..1dadb769417b 100644
--- a/clang/lib/Parse/ParseDeclCXX.cpp
+++ b/clang/lib/Parse/ParseDeclCXX.cpp
@@ -27,6 +27,7 @@
#include "clang/Sema/Scope.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/Support/TimeProfiler.h"
+#include <optional>
using namespace clang;