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-rw-r--r--boost/hana/concept.hpp1
1 files changed, 1 insertions, 0 deletions
diff --git a/boost/hana/concept.hpp b/boost/hana/concept.hpp
index c8decf9925..0ae73d8b7b 100644
--- a/boost/hana/concept.hpp
+++ b/boost/hana/concept.hpp
@@ -18,6 +18,7 @@ Distributed under the Boost Software License, Version 1.0.
#include <boost/hana/concept/foldable.hpp>
#include <boost/hana/concept/functor.hpp>
#include <boost/hana/concept/group.hpp>
+#include <boost/hana/concept/hashable.hpp>
#include <boost/hana/concept/integral_constant.hpp>
#include <boost/hana/concept/iterable.hpp>
#include <boost/hana/concept/logical.hpp>