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-rw-r--r--clang/lib/Sema/SemaCUDA.cpp1
1 files changed, 1 insertions, 0 deletions
diff --git a/clang/lib/Sema/SemaCUDA.cpp b/clang/lib/Sema/SemaCUDA.cpp
index 01349f41..58063df 100644
--- a/clang/lib/Sema/SemaCUDA.cpp
+++ b/clang/lib/Sema/SemaCUDA.cpp
@@ -24,6 +24,7 @@
#include "clang/Sema/Template.h"
#include "llvm/ADT/Optional.h"
#include "llvm/ADT/SmallVector.h"
+#include <optional>
using namespace clang;
template <typename AttrT> static bool hasExplicitAttr(const VarDecl *D) {