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diff --git a/lib/asio/experimental/co_spawn.hpp b/lib/asio/experimental/co_spawn.hpp
deleted file mode 100644
index cbf5bc5..0000000
--- a/lib/asio/experimental/co_spawn.hpp
+++ /dev/null
@@ -1,226 +0,0 @@
-//
-// experimental/co_spawn.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_EXPERIMENTAL_CO_SPAWN_HPP
-#define ASIO_EXPERIMENTAL_CO_SPAWN_HPP
-
-#if defined(_MSC_VER) && (_MSC_VER >= 1200)
-# pragma once
-#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
-
-#include "asio/detail/config.hpp"
-
-#if defined(ASIO_HAS_CO_AWAIT) || defined(GENERATING_DOCUMENTATION)
-
-#include <experimental/coroutine>
-#include "asio/executor.hpp"
-#include "asio/strand.hpp"
-
-#include "asio/detail/push_options.hpp"
-
-namespace asio {
-namespace experimental {
-namespace detail {
-
-using std::experimental::coroutine_handle;
-
-template <typename> class awaiter;
-template <typename> class awaitee_base;
-template <typename, typename> class awaitee;
-template <typename, typename> class await_handler_base;
-template <typename Executor, typename F, typename CompletionToken>
-auto co_spawn(const Executor& ex, F&& f, CompletionToken&& token);
-
-} // namespace detail
-
-namespace this_coro {
-
-/// Awaitable type that returns a completion token for the current coroutine.
-struct token_t {};
-
-/// Awaitable object that returns a completion token for the current coroutine.
-constexpr inline token_t token() { return {}; }
-
-/// Awaitable type that returns the executor of the current coroutine.
-struct executor_t {};
-
-/// Awaitable object that returns the executor of the current coroutine.
-constexpr inline executor_t executor() { return {}; }
-
-} // namespace this_coro
-
-/// A completion token that represents the currently executing coroutine.
-/**
- * The await_token class is used to represent the currently executing
- * coroutine. An await_token may be passed as a handler to an asynchronous
- * operation. For example:
- *
- * @code awaitable<void> my_coroutine()
- * {
- *   await_token token = co_await this_coro::token();
- *   ...
- *   std::size_t n = co_await my_socket.async_read_some(buffer, token);
- *   ...
- * } @endcode
- *
- * The initiating function (async_read_some in the above example) suspends the
- * current coroutine. The coroutine is resumed when the asynchronous operation
- * completes, and the result of the operation is returned.
- */
-template <typename Executor>
-class await_token
-{
-public:
-  /// The associated executor type.
-  typedef Executor executor_type;
-
-  /// Copy constructor.
-  await_token(const await_token& other) noexcept
-    : awaiter_(other.awaiter_)
-  {
-  }
-
-  /// Move constructor.
-  await_token(await_token&& other) noexcept
-    : awaiter_(std::exchange(other.awaiter_, nullptr))
-  {
-  }
-
-  /// Get the associated executor.
-  executor_type get_executor() const noexcept
-  {
-    return awaiter_->get_executor();
-  }
-
-private:
-  // No assignment allowed.
-  await_token& operator=(const await_token&) = delete;
-
-  template <typename> friend class detail::awaitee_base;
-  template <typename, typename> friend class detail::await_handler_base;
-
-  // Private constructor used by awaitee_base.
-  explicit await_token(detail::awaiter<Executor>* a)
-    : awaiter_(a)
-  {
-  }
-
-  detail::awaiter<Executor>* awaiter_;
-};
-
-/// The return type of a coroutine or asynchronous operation.
-template <typename T, typename Executor = strand<executor>>
-class awaitable
-{
-public:
-  /// The type of the awaited value.
-  typedef T value_type;
-
-  /// The executor type that will be used for the coroutine.
-  typedef Executor executor_type;
-
-  /// Move constructor.
-  awaitable(awaitable&& other) noexcept
-    : awaitee_(std::exchange(other.awaitee_, nullptr))
-  {
-  }
-
-  /// Destructor
-  ~awaitable()
-  {
-    if (awaitee_)
-    {
-      detail::coroutine_handle<
-        detail::awaitee<T, Executor>>::from_promise(
-          *awaitee_).destroy();
-    }
-  }
-
-#if !defined(GENERATING_DOCUMENTATION)
-
-  // Support for co_await keyword.
-  bool await_ready() const noexcept
-  {
-    return awaitee_->ready();
-  }
-
-  // Support for co_await keyword.
-  void await_suspend(detail::coroutine_handle<detail::awaiter<Executor>> h)
-  {
-    awaitee_->attach_caller(h);
-  }
-
-  // Support for co_await keyword.
-  template <class U>
-  void await_suspend(detail::coroutine_handle<detail::awaitee<U, Executor>> h)
-  {
-    awaitee_->attach_caller(h);
-  }
-
-  // Support for co_await keyword.
-  T await_resume()
-  {
-    return awaitee_->get();
-  }
-
-#endif // !defined(GENERATING_DOCUMENTATION)
-
-private:
-  template <typename, typename> friend class detail::awaitee;
-  template <typename, typename> friend class detail::await_handler_base;
-
-  // Not copy constructible or copy assignable.
-  awaitable(const awaitable&) = delete;
-  awaitable& operator=(const awaitable&) = delete;
-
-  // Construct the awaitable from a coroutine's promise object.
-  explicit awaitable(detail::awaitee<T, Executor>* a) : awaitee_(a) {}
-
-  detail::awaitee<T, Executor>* awaitee_;
-};
-
-/// Spawn a new thread of execution.
-template <typename Executor, typename F, typename CompletionToken,
-    typename = typename enable_if<is_executor<Executor>::value>::type>
-inline auto co_spawn(const Executor& ex, F&& f, CompletionToken&& token)
-{
-  return detail::co_spawn(ex, std::forward<F>(f),
-      std::forward<CompletionToken>(token));
-}
-
-/// Spawn a new thread of execution.
-template <typename ExecutionContext, typename F, typename CompletionToken,
-    typename = typename enable_if<
-      is_convertible<ExecutionContext&, execution_context&>::value>::type>
-inline auto co_spawn(ExecutionContext& ctx, F&& f, CompletionToken&& token)
-{
-  return detail::co_spawn(ctx.get_executor(), std::forward<F>(f),
-      std::forward<CompletionToken>(token));
-}
-
-/// Spawn a new thread of execution.
-template <typename Executor, typename F, typename CompletionToken>
-inline auto co_spawn(const await_token<Executor>& parent,
-    F&& f, CompletionToken&& token)
-{
-  return detail::co_spawn(parent.get_executor(), std::forward<F>(f),
-      std::forward<CompletionToken>(token));
-}
-
-} // namespace experimental
-} // namespace asio
-
-#include "asio/detail/pop_options.hpp"
-
-#include "asio/experimental/impl/co_spawn.hpp"
-
-#endif // defined(ASIO_HAS_CO_AWAIT) || defined(GENERATING_DOCUMENTATION)
-
-#endif // ASIO_EXPERIMENTAL_CO_SPAWN_HPP