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-rw-r--r--clang/lib/Serialization/ASTWriter.cpp1
1 files changed, 1 insertions, 0 deletions
diff --git a/clang/lib/Serialization/ASTWriter.cpp b/clang/lib/Serialization/ASTWriter.cpp
index af3367f2d105..2a5618f0c0d6 100644
--- a/clang/lib/Serialization/ASTWriter.cpp
+++ b/clang/lib/Serialization/ASTWriter.cpp
@@ -111,6 +111,7 @@
#include <ctime>
#include <limits>
#include <memory>
+#include <optional>
#include <queue>
#include <tuple>
#include <utility>