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-rw-r--r--include/llvm/ADT/ImmutableSet.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/llvm/ADT/ImmutableSet.h b/include/llvm/ADT/ImmutableSet.h
index 717ec98..c351771 100644
--- a/include/llvm/ADT/ImmutableSet.h
+++ b/include/llvm/ADT/ImmutableSet.h
@@ -18,6 +18,7 @@
#include "llvm/ADT/FoldingSet.h"
#include "llvm/Support/DataTypes.h"
#include <cassert>
+#include <functional>
namespace llvm {