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diff --git a/lib/asio/uses_executor.hpp b/lib/asio/uses_executor.hpp
deleted file mode 100644
index e985c28..0000000
--- a/lib/asio/uses_executor.hpp
+++ /dev/null
@@ -1,71 +0,0 @@
-//
-// uses_executor.hpp
-// ~~~~~~~~~~~~~~~~~
-//
-// Copyright (c) 2003-2018 Christopher M. Kohlhoff (chris at kohlhoff dot com)
-//
-// Distributed under the Boost Software License, Version 1.0. (See accompanying
-// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
-//
-
-#ifndef ASIO_USES_EXECUTOR_HPP
-#define ASIO_USES_EXECUTOR_HPP
-
-#if defined(_MSC_VER) && (_MSC_VER >= 1200)
-# pragma once
-#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
-
-#include "asio/detail/config.hpp"
-#include "asio/detail/type_traits.hpp"
-
-#include "asio/detail/push_options.hpp"
-
-namespace asio {
-
-/// A special type, similar to std::nothrow_t, used to disambiguate
-/// constructors that accept executor arguments.
-/**
- * The executor_arg_t struct is an empty structure type used as a unique type
- * to disambiguate constructor and function overloading. Specifically, some
- * types have constructors with executor_arg_t as the first argument,
- * immediately followed by an argument of a type that satisfies the Executor
- * type requirements.
- */
-struct executor_arg_t
-{
-  /// Constructor.
-  ASIO_CONSTEXPR executor_arg_t() ASIO_NOEXCEPT
-  {
-  }
-};
-
-/// A special value, similar to std::nothrow, used to disambiguate constructors
-/// that accept executor arguments.
-/**
- * See asio::executor_arg_t and asio::uses_executor
- * for more information.
- */
-#if defined(ASIO_HAS_CONSTEXPR) || defined(GENERATING_DOCUMENTATION)
-constexpr executor_arg_t executor_arg;
-#elif defined(ASIO_MSVC)
-__declspec(selectany) executor_arg_t executor_arg;
-#endif
-
-/// The uses_executor trait detects whether a type T has an associated executor
-/// that is convertible from type Executor.
-/**
- * Meets the BinaryTypeTrait requirements. The Asio library provides a
- * definition that is derived from false_type. A program may specialize this
- * template to derive from true_type for a user-defined type T that can be
- * constructed with an executor, where the first argument of a constructor has
- * type executor_arg_t and the second argument is convertible from type
- * Executor.
- */
-template <typename T, typename Executor>
-struct uses_executor : false_type {};
-
-} // namespace asio
-
-#include "asio/detail/pop_options.hpp"
-
-#endif // ASIO_USES_EXECUTOR_HPP