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-rw-r--r--clang/lib/CodeGen/SwiftCallingConv.cpp1
1 files changed, 1 insertions, 0 deletions
diff --git a/clang/lib/CodeGen/SwiftCallingConv.cpp b/clang/lib/CodeGen/SwiftCallingConv.cpp
index d4c6c96..982067c4 100644
--- a/clang/lib/CodeGen/SwiftCallingConv.cpp
+++ b/clang/lib/CodeGen/SwiftCallingConv.cpp
@@ -15,6 +15,7 @@
#include "CodeGenModule.h"
#include "TargetInfo.h"
#include "clang/Basic/TargetInfo.h"
+#include <optional>
using namespace clang;
using namespace CodeGen;