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-rw-r--r--clang/lib/AST/TemplateBase.cpp1
1 files changed, 1 insertions, 0 deletions
diff --git a/clang/lib/AST/TemplateBase.cpp b/clang/lib/AST/TemplateBase.cpp
index bd3a3e9d9cf1..c5a8895318f4 100644
--- a/clang/lib/AST/TemplateBase.cpp
+++ b/clang/lib/AST/TemplateBase.cpp
@@ -40,6 +40,7 @@
#include <cstddef>
#include <cstdint>
#include <cstring>
+#include <optional>
using namespace clang;