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-rw-r--r--clang/lib/ASTMatchers/ASTMatchersInternal.cpp1
1 files changed, 1 insertions, 0 deletions
diff --git a/clang/lib/ASTMatchers/ASTMatchersInternal.cpp b/clang/lib/ASTMatchers/ASTMatchersInternal.cpp
index f9a1a59401ac..9e755fa271be 100644
--- a/clang/lib/ASTMatchers/ASTMatchersInternal.cpp
+++ b/clang/lib/ASTMatchers/ASTMatchersInternal.cpp
@@ -34,6 +34,7 @@
#include <algorithm>
#include <cassert>
#include <cstddef>
+#include <optional>
#include <string>
#include <utility>
#include <vector>