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-rw-r--r--clang/lib/Serialization/ASTReader.cpp1
1 files changed, 1 insertions, 0 deletions
diff --git a/clang/lib/Serialization/ASTReader.cpp b/clang/lib/Serialization/ASTReader.cpp
index c47a56b075f9..2e920e29adb8 100644
--- a/clang/lib/Serialization/ASTReader.cpp
+++ b/clang/lib/Serialization/ASTReader.cpp
@@ -135,6 +135,7 @@
#include <limits>
#include <map>
#include <memory>
+#include <optional>
#include <string>
#include <system_error>
#include <tuple>