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diff --git a/src/third_party/boost-1.56.0/boost/asio/use_future.hpp b/src/third_party/boost-1.56.0/boost/asio/use_future.hpp
deleted file mode 100644
index c643c8d4625..00000000000
--- a/src/third_party/boost-1.56.0/boost/asio/use_future.hpp
+++ /dev/null
@@ -1,94 +0,0 @@
-//
-// use_future.hpp
-// ~~~~~~~~~~~~~~
-//
-// Copyright (c) 2003-2014 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 BOOST_ASIO_USE_FUTURE_HPP
-#define BOOST_ASIO_USE_FUTURE_HPP
-
-#if defined(_MSC_VER) && (_MSC_VER >= 1200)
-# pragma once
-#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
-
-#include <boost/asio/detail/config.hpp>
-#include <memory>
-
-#include <boost/asio/detail/push_options.hpp>
-
-namespace boost {
-namespace asio {
-
-/// Class used to specify that an asynchronous operation should return a future.
-/**
- * The use_future_t class is used to indicate that an asynchronous operation
- * should return a std::future object. A use_future_t object may be passed as a
- * handler to an asynchronous operation, typically using the special value @c
- * boost::asio::use_future. For example:
- *
- * @code std::future<std::size_t> my_future
- *   = my_socket.async_read_some(my_buffer, boost::asio::use_future); @endcode
- *
- * The initiating function (async_read_some in the above example) returns a
- * future that will receive the result of the operation. If the operation
- * completes with an error_code indicating failure, it is converted into a
- * system_error and passed back to the caller via the future.
- */
-template <typename Allocator = std::allocator<void> >
-class use_future_t
-{
-public:
-  /// The allocator type. The allocator is used when constructing the
-  /// @c std::promise object for a given asynchronous operation.
-  typedef Allocator allocator_type;
-
-  /// Construct using default-constructed allocator.
-  BOOST_ASIO_CONSTEXPR use_future_t()
-  {
-  }
-
-  /// Construct using specified allocator.
-  explicit use_future_t(const Allocator& allocator)
-    : allocator_(allocator)
-  {
-  }
-
-  /// Specify an alternate allocator.
-  template <typename OtherAllocator>
-  use_future_t<OtherAllocator> operator[](const OtherAllocator& allocator) const
-  {
-    return use_future_t<OtherAllocator>(allocator);
-  }
-
-  /// Obtain allocator.
-  allocator_type get_allocator() const
-  {
-    return allocator_;
-  }
-
-private:
-  Allocator allocator_;
-};
-
-/// A special value, similar to std::nothrow.
-/**
- * See the documentation for boost::asio::use_future_t for a usage example.
- */
-#if defined(BOOST_ASIO_HAS_CONSTEXPR) || defined(GENERATING_DOCUMENTATION)
-constexpr use_future_t<> use_future;
-#elif defined(BOOST_ASIO_MSVC)
-__declspec(selectany) use_future_t<> use_future;
-#endif
-
-} // namespace asio
-} // namespace boost
-
-#include <boost/asio/detail/pop_options.hpp>
-
-#include <boost/asio/impl/use_future.hpp>
-
-#endif // BOOST_ASIO_USE_FUTURE_HPP