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+///////////////////////////////////////////////////////////////////////////////
+// Reference implementation of std::generator proposal P2168.
+//
+// See https://wg21.link/P2168 for details.
+//
+///////////////////////////////////////////////////////////////////////////////
+// Copyright Lewis Baker, Corentin Jabot
+//
+// Use, modification and distribution is subject to the Boost Software License,
+// Version 1.0.
+// (See accompanying file LICENSE or http://www.boost.org/LICENSE_1_0.txt)
+///////////////////////////////////////////////////////////////////////////////
+
+module;
+
+#include <type_traits>
+
+export module nihil.generator:forward;
+
+import :util;
+
+namespace nihil {
+
+export template <typename Ref,
+          typename Value = std::remove_cvref_t<Ref>,
+          typename Allocator = use_allocator_arg>
+class generator;
+
+} // namespace nihil