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-rw-r--r--clang/lib/Lex/Lexer.cpp1
1 files changed, 1 insertions, 0 deletions
diff --git a/clang/lib/Lex/Lexer.cpp b/clang/lib/Lex/Lexer.cpp
index ce48e7d..9965acb 100644
--- a/clang/lib/Lex/Lexer.cpp
+++ b/clang/lib/Lex/Lexer.cpp
@@ -43,6 +43,7 @@
#include <cstddef>
#include <cstdint>
#include <cstring>
+#include <optional>
#include <string>
#include <tuple>
#include <utility>