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-rw-r--r--clang/include/clang/Lex/ModuleMap.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/clang/include/clang/Lex/ModuleMap.h b/clang/include/clang/Lex/ModuleMap.h
index ba7b681..2ce5961 100644
--- a/clang/include/clang/Lex/ModuleMap.h
+++ b/clang/include/clang/Lex/ModuleMap.h
@@ -30,6 +30,7 @@
#include "llvm/ADT/Twine.h"
#include <ctime>
#include <memory>
+#include <optional>
#include <string>
#include <utility>