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-rw-r--r--clang/lib/AST/NSAPI.cpp1
1 files changed, 1 insertions, 0 deletions
diff --git a/clang/lib/AST/NSAPI.cpp b/clang/lib/AST/NSAPI.cpp
index db301e7a30d7..81c8f7667ab1 100644
--- a/clang/lib/AST/NSAPI.cpp
+++ b/clang/lib/AST/NSAPI.cpp
@@ -11,6 +11,7 @@
#include "clang/AST/DeclObjC.h"
#include "clang/AST/Expr.h"
#include "llvm/ADT/StringSwitch.h"
+#include <optional>
using namespace clang;