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diff --git a/odb/odb/traversal/unit.hxx b/odb/odb/traversal/unit.hxx
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+// file      : odb/traversal/unit.hxx
+// license   : GNU GPL v3; see accompanying LICENSE file
+
+#ifndef ODB_TRAVERSAL_UNIT_HXX
+#define ODB_TRAVERSAL_UNIT_HXX
+
+#include <odb/semantics/unit.hxx>
+#include <odb/traversal/elements.hxx>
+
+namespace traversal
+{
+  struct unit: scope_template<semantics::unit> {};
+}
+
+#endif // ODB_TRAVERSAL_UNIT_HXX