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-rw-r--r--clang/lib/Sema/SemaDecl.cpp1
1 files changed, 1 insertions, 0 deletions
diff --git a/clang/lib/Sema/SemaDecl.cpp b/clang/lib/Sema/SemaDecl.cpp
index 9ab53f56d29c..44657a1cc168 100644
--- a/clang/lib/Sema/SemaDecl.cpp
+++ b/clang/lib/Sema/SemaDecl.cpp
@@ -50,6 +50,7 @@
#include <algorithm>
#include <cstring>
#include <functional>
+#include <optional>
#include <unordered_map>
using namespace clang;