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diff --git a/lib/asio/executor_work_guard.hpp b/lib/asio/executor_work_guard.hpp
deleted file mode 100644
index 1875f54..0000000
--- a/lib/asio/executor_work_guard.hpp
+++ /dev/null
@@ -1,170 +0,0 @@
-//
-// executor_work_guard.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_EXECUTOR_WORK_GUARD_HPP
-#define ASIO_EXECUTOR_WORK_GUARD_HPP
-
-#if defined(_MSC_VER) && (_MSC_VER >= 1200)
-# pragma once
-#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
-
-#include "asio/detail/config.hpp"
-#include "asio/associated_executor.hpp"
-#include "asio/detail/type_traits.hpp"
-#include "asio/is_executor.hpp"
-
-#include "asio/detail/push_options.hpp"
-
-namespace asio {
-
-/// An object of type @c executor_work_guard controls ownership of executor work
-/// within a scope.
-template <typename Executor>
-class executor_work_guard
-{
-public:
-  /// The underlying executor type.
-  typedef Executor executor_type;
-
-  /// Constructs a @c executor_work_guard object for the specified executor.
-  /**
-   * Stores a copy of @c e and calls <tt>on_work_started()</tt> on it.
-   */
-  explicit executor_work_guard(const executor_type& e) ASIO_NOEXCEPT
-    : executor_(e),
-      owns_(true)
-  {
-    executor_.on_work_started();
-  }
-
-  /// Copy constructor.
-  executor_work_guard(const executor_work_guard& other) ASIO_NOEXCEPT
-    : executor_(other.executor_),
-      owns_(other.owns_)
-  {
-    if (owns_)
-      executor_.on_work_started();
-  }
-
-#if defined(ASIO_HAS_MOVE) || defined(GENERATING_DOCUMENTATION)
-  /// Move constructor.
-  executor_work_guard(executor_work_guard&& other)
-    : executor_(ASIO_MOVE_CAST(Executor)(other.executor_)),
-      owns_(other.owns_)
-  {
-    other.owns_ = false;
-  }
-#endif //  defined(ASIO_HAS_MOVE) || defined(GENERATING_DOCUMENTATION)
-
-  /// Destructor.
-  /**
-   * Unless the object has already been reset, or is in a moved-from state,
-   * calls <tt>on_work_finished()</tt> on the stored executor.
-   */
-  ~executor_work_guard()
-  {
-    if (owns_)
-      executor_.on_work_finished();
-  }
-
-  /// Obtain the associated executor.
-  executor_type get_executor() const ASIO_NOEXCEPT
-  {
-    return executor_;
-  }
-
-  /// Whether the executor_work_guard object owns some outstanding work.
-  bool owns_work() const ASIO_NOEXCEPT
-  {
-    return owns_;
-  }
-
-  /// Indicate that the work is no longer outstanding.
-  /*
-   * Unless the object has already been reset, or is in a moved-from state,
-   * calls <tt>on_work_finished()</tt> on the stored executor.
-   */
-  void reset() ASIO_NOEXCEPT
-  {
-    if (owns_)
-    {
-      executor_.on_work_finished();
-      owns_ = false;
-    }
-  }
-
-private:
-  // Disallow assignment.
-  executor_work_guard& operator=(const executor_work_guard&);
-
-  executor_type executor_;
-  bool owns_;
-};
-
-/// Create an @ref executor_work_guard object.
-template <typename Executor>
-inline executor_work_guard<Executor> make_work_guard(const Executor& ex,
-    typename enable_if<is_executor<Executor>::value>::type* = 0)
-{
-  return executor_work_guard<Executor>(ex);
-}
-
-/// Create an @ref executor_work_guard object.
-template <typename ExecutionContext>
-inline executor_work_guard<typename ExecutionContext::executor_type>
-make_work_guard(ExecutionContext& ctx,
-    typename enable_if<
-      is_convertible<ExecutionContext&, execution_context&>::value>::type* = 0)
-{
-  return executor_work_guard<typename ExecutionContext::executor_type>(
-      ctx.get_executor());
-}
-
-/// Create an @ref executor_work_guard object.
-template <typename T>
-inline executor_work_guard<typename associated_executor<T>::type>
-make_work_guard(const T& t,
-    typename enable_if<!is_executor<T>::value &&
-      !is_convertible<T&, execution_context&>::value>::type* = 0)
-{
-  return executor_work_guard<typename associated_executor<T>::type>(
-      associated_executor<T>::get(t));
-}
-
-/// Create an @ref executor_work_guard object.
-template <typename T, typename Executor>
-inline executor_work_guard<typename associated_executor<T, Executor>::type>
-make_work_guard(const T& t, const Executor& ex,
-    typename enable_if<is_executor<Executor>::value>::type* = 0)
-{
-  return executor_work_guard<typename associated_executor<T, Executor>::type>(
-      associated_executor<T, Executor>::get(t, ex));
-}
-
-/// Create an @ref executor_work_guard object.
-template <typename T, typename ExecutionContext>
-inline executor_work_guard<typename associated_executor<T,
-  typename ExecutionContext::executor_type>::type>
-make_work_guard(const T& t, ExecutionContext& ctx,
-    typename enable_if<!is_executor<T>::value &&
-      !is_convertible<T&, execution_context&>::value &&
-      is_convertible<ExecutionContext&, execution_context&>::value>::type* = 0)
-{
-  return executor_work_guard<typename associated_executor<T,
-    typename ExecutionContext::executor_type>::type>(
-      associated_executor<T, typename ExecutionContext::executor_type>::get(
-        t, ctx.get_executor()));
-}
-
-} // namespace asio
-
-#include "asio/detail/pop_options.hpp"
-
-#endif // ASIO_EXECUTOR_WORK_GUARD_HPP