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diff --git a/lib/asio/system_executor.hpp b/lib/asio/system_executor.hpp
deleted file mode 100644
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--- a/lib/asio/system_executor.hpp
+++ /dev/null
@@ -1,129 +0,0 @@
-//
-// system_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_SYSTEM_EXECUTOR_HPP
-#define ASIO_SYSTEM_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/push_options.hpp"
-
-namespace asio {
-
-class system_context;
-
-/// An executor that uses arbitrary threads.
-/**
- * The system executor represents an execution context where functions are
- * permitted to run on arbitrary threads. The post() and defer() functions
- * schedule the function to run on an unspecified system thread pool, and
- * dispatch() invokes the function immediately.
- */
-class system_executor
-{
-public:
-  /// Obtain the underlying execution context.
-  system_context& context() const ASIO_NOEXCEPT;
-
-  /// Inform the executor that it has some outstanding work to do.
-  /**
-   * For the system executor, this is a no-op.
-   */
-  void on_work_started() const ASIO_NOEXCEPT
-  {
-  }
-
-  /// Inform the executor that some work is no longer outstanding.
-  /**
-   * For the system executor, this is a no-op.
-   */
-  void on_work_finished() const ASIO_NOEXCEPT
-  {
-  }
-
-  /// Request the system executor to invoke the given function object.
-  /**
-   * This function is used to ask the executor to execute the given function
-   * object. The function object will always be executed inside this function.
-   *
-   * @param f The function object to be called. The executor will make
-   * a copy of the handler object as required. The function signature of the
-   * function object must be: @code void function(); @endcode
-   *
-   * @param a An allocator that may be used by the executor to allocate the
-   * internal storage needed for function invocation.
-   */
-  template <typename Function, typename Allocator>
-  void dispatch(ASIO_MOVE_ARG(Function) f, const Allocator& a) const;
-
-  /// Request the system executor to invoke the given function object.
-  /**
-   * This function is used to ask the executor to execute the given function
-   * object. The function object will never be executed inside this function.
-   * Instead, it will be scheduled to run on an unspecified system thread pool.
-   *
-   * @param f The function object to be called. The executor will make
-   * a copy of the handler object as required. The function signature of the
-   * function object must be: @code void function(); @endcode
-   *
-   * @param a An allocator that may be used by the executor to allocate the
-   * internal storage needed for function invocation.
-   */
-  template <typename Function, typename Allocator>
-  void post(ASIO_MOVE_ARG(Function) f, const Allocator& a) const;
-
-  /// Request the system executor to invoke the given function object.
-  /**
-   * This function is used to ask the executor to execute the given function
-   * object. The function object will never be executed inside this function.
-   * Instead, it will be scheduled to run on an unspecified system thread pool.
-   *
-   * @param f The function object to be called. The executor will make
-   * a copy of the handler object as required. The function signature of the
-   * function object must be: @code void function(); @endcode
-   *
-   * @param a An allocator that may be used by the executor to allocate the
-   * internal storage needed for function invocation.
-   */
-  template <typename Function, typename Allocator>
-  void defer(ASIO_MOVE_ARG(Function) f, const Allocator& a) const;
-
-  /// Compare two executors for equality.
-  /**
-   * System executors always compare equal.
-   */
-  friend bool operator==(const system_executor&,
-      const system_executor&) ASIO_NOEXCEPT
-  {
-    return true;
-  }
-
-  /// Compare two executors for inequality.
-  /**
-   * System executors always compare equal.
-   */
-  friend bool operator!=(const system_executor&,
-      const system_executor&) ASIO_NOEXCEPT
-  {
-    return false;
-  }
-};
-
-} // namespace asio
-
-#include "asio/detail/pop_options.hpp"
-
-#include "asio/impl/system_executor.hpp"
-
-#endif // ASIO_SYSTEM_EXECUTOR_HPP