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-rw-r--r--clang/lib/Lex/PreprocessingRecord.cpp1
1 files changed, 1 insertions, 0 deletions
diff --git a/clang/lib/Lex/PreprocessingRecord.cpp b/clang/lib/Lex/PreprocessingRecord.cpp
index 1b13d09f2349..e187fb60c31d 100644
--- a/clang/lib/Lex/PreprocessingRecord.cpp
+++ b/clang/lib/Lex/PreprocessingRecord.cpp
@@ -31,6 +31,7 @@
#include <cstddef>
#include <cstring>
#include <iterator>
+#include <optional>
#include <utility>
#include <vector>