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-rw-r--r--libstdc++-v3/include/backward/hash_set.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/libstdc++-v3/include/backward/hash_set.h b/libstdc++-v3/include/backward/hash_set.h
index 9458910a5f9..b09ba41d066 100644
--- a/libstdc++-v3/include/backward/hash_set.h
+++ b/libstdc++-v3/include/backward/hash_set.h
@@ -27,6 +27,7 @@
#ifndef _CPP_BACKWARD_HASH_SET_H
#define _CPP_BACKWARD_HASH_SET_H 1
+#include "backward_warning.h"
#include "algobase.h"
#include <ext/hash_set>
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