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diff --git a/lib/sol2/include/sol/policies.hpp b/lib/sol2/include/sol/policies.hpp
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+++ b/lib/sol2/include/sol/policies.hpp
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+// sol3 
+
+// The MIT License (MIT)
+
+// Copyright (c) 2013-2019 Rapptz, ThePhD and contributors
+
+// Permission is hereby granted, free of charge, to any person obtaining a copy of
+// this software and associated documentation files (the "Software"), to deal in
+// the Software without restriction, including without limitation the rights to
+// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+// the Software, and to permit persons to whom the Software is furnished to do so,
+// subject to the following conditions:
+
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+// FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+// COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+// IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+// CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+#ifndef SOL_FILTERS_HPP
+#define SOL_FILTERS_HPP
+
+#include "traits.hpp"
+
+#include <array>
+
+namespace sol {
+	namespace detail {
+		struct policy_base_tag {};
+	} // namespace detail
+
+	template <int Target, int... In>
+	struct static_stack_dependencies : detail::policy_base_tag {};
+	typedef static_stack_dependencies<-1, 1> self_dependency;
+	template <int... In>
+	struct returns_self_with : detail::policy_base_tag {};
+	typedef returns_self_with<> returns_self;
+
+	struct stack_dependencies : detail::policy_base_tag {
+		int target;
+		std::array<int, 64> stack_indices;
+		std::size_t len;
+
+		template <typename... Args>
+		stack_dependencies(int stack_target, Args&&... args)
+		: target(stack_target), stack_indices(), len(sizeof...(Args)) {
+			std::size_t i = 0;
+			(void)detail::swallow{int(), (stack_indices[i++] = static_cast<int>(std::forward<Args>(args)), int())...};
+		}
+
+		int& operator[](std::size_t i) {
+			return stack_indices[i];
+		}
+
+		const int& operator[](std::size_t i) const {
+			return stack_indices[i];
+		}
+
+		std::size_t size() const {
+			return len;
+		}
+	};
+
+	template <typename F, typename... Policies>
+	struct policy_wrapper {
+		typedef std::index_sequence_for<Policies...> indices;
+
+		F value;
+		std::tuple<Policies...> policies;
+
+		template <typename Fx, typename... Args, meta::enable<meta::neg<std::is_same<meta::unqualified_t<Fx>, policy_wrapper>>> = meta::enabler>
+		policy_wrapper(Fx&& fx, Args&&... args)
+		: value(std::forward<Fx>(fx)), policies(std::forward<Args>(args)...) {
+		}
+
+		policy_wrapper(const policy_wrapper&) = default;
+		policy_wrapper& operator=(const policy_wrapper&) = default;
+		policy_wrapper(policy_wrapper&&) = default;
+		policy_wrapper& operator=(policy_wrapper&&) = default;
+	};
+
+	template <typename F, typename... Args>
+	auto policies(F&& f, Args&&... args) {
+		return policy_wrapper<std::decay_t<F>, std::decay_t<Args>...>(std::forward<F>(f), std::forward<Args>(args)...);
+	}
+
+	namespace detail {
+		template <typename T>
+		using is_policy = meta::is_specialization_of<T, policy_wrapper>;
+		
+		template <typename T>
+		inline constexpr bool is_policy_v = is_policy<T>::value;
+	}
+} // namespace sol
+
+#endif // SOL_FILTERS_HPP