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-rw-r--r--clang/lib/AST/Expr.cpp1
1 files changed, 1 insertions, 0 deletions
diff --git a/clang/lib/AST/Expr.cpp b/clang/lib/AST/Expr.cpp
index a735f95427d1..9858fbf85cb8 100644
--- a/clang/lib/AST/Expr.cpp
+++ b/clang/lib/AST/Expr.cpp
@@ -37,6 +37,7 @@
#include "llvm/Support/raw_ostream.h"
#include <algorithm>
#include <cstring>
+#include <optional>
using namespace clang;
const Expr *Expr::getBestDynamicClassTypeExpr() const {