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-rw-r--r--clang/lib/Lex/TokenLexer.cpp1
1 files changed, 1 insertions, 0 deletions
diff --git a/clang/lib/Lex/TokenLexer.cpp b/clang/lib/Lex/TokenLexer.cpp
index a64a00d..6f801db 100644
--- a/clang/lib/Lex/TokenLexer.cpp
+++ b/clang/lib/Lex/TokenLexer.cpp
@@ -31,6 +31,7 @@
#include "llvm/ADT/iterator_range.h"
#include <cassert>
#include <cstring>
+#include <optional>
using namespace clang;