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diff --git a/src/third_party/boost-1.68.0/boost/type_traits/is_nothrow_move_constructible.hpp b/src/third_party/boost-1.68.0/boost/type_traits/is_nothrow_move_constructible.hpp
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index 30b6a16ec84..00000000000
--- a/src/third_party/boost-1.68.0/boost/type_traits/is_nothrow_move_constructible.hpp
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@@ -1,97 +0,0 @@
-
-// (C) Copyright Steve Cleary, Beman Dawes, Howard Hinnant & John Maddock 2000.
-// (C) Copyright Eric Friedman 2002-2003.
-// (C) Copyright Antony Polukhin 2013.
-// Use, modification and distribution are subject to 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).
-//
-// See http://www.boost.org/libs/type_traits for most recent version including documentation.
-
-#ifndef BOOST_TT_IS_NOTHROW_MOVE_CONSTRUCTIBLE_HPP_INCLUDED
-#define BOOST_TT_IS_NOTHROW_MOVE_CONSTRUCTIBLE_HPP_INCLUDED
-
-#include <cstddef> // size_t
-#include <boost/config.hpp>
-#include <boost/type_traits/intrinsics.hpp>
-#include <boost/type_traits/integral_constant.hpp>
-#include <boost/detail/workaround.hpp>
-#include <boost/type_traits/is_complete.hpp>
-#include <boost/static_assert.hpp>
-
-#ifdef BOOST_IS_NOTHROW_MOVE_CONSTRUCT
-
-namespace boost {
-
-template <class T>
-struct is_nothrow_move_constructible : public integral_constant<bool, BOOST_IS_NOTHROW_MOVE_CONSTRUCT(T)>
-{
- BOOST_STATIC_ASSERT_MSG(boost::is_complete<T>::value, "Arguments to is_nothrow_move_constructible must be complete types");
-};
-
-template <class T> struct is_nothrow_move_constructible<volatile T> : public ::boost::false_type {};
-template <class T> struct is_nothrow_move_constructible<const volatile T> : public ::boost::false_type{};
-
-#elif !defined(BOOST_NO_CXX11_NOEXCEPT) && !defined(BOOST_NO_SFINAE_EXPR) && !BOOST_WORKAROUND(BOOST_GCC_VERSION, < 40700)
-
-#include <boost/type_traits/declval.hpp>
-#include <boost/utility/enable_if.hpp>
-
-namespace boost{ namespace detail{
-
-template <class T, class Enable = void>
-struct false_or_cpp11_noexcept_move_constructible: public ::boost::false_type {};
-
-template <class T>
-struct false_or_cpp11_noexcept_move_constructible <
- T,
- typename ::boost::enable_if_c<sizeof(T) && BOOST_NOEXCEPT_EXPR(T(::boost::declval<T>()))>::type
- > : public ::boost::integral_constant<bool, BOOST_NOEXCEPT_EXPR(T(::boost::declval<T>()))>
-{};
-
-}
-
-template <class T> struct is_nothrow_move_constructible
- : public integral_constant<bool, ::boost::detail::false_or_cpp11_noexcept_move_constructible<T>::value>
-{
- BOOST_STATIC_ASSERT_MSG(boost::is_complete<T>::value, "Arguments to is_nothrow_move_constructible must be complete types");
-};
-
-template <class T> struct is_nothrow_move_constructible<volatile T> : public ::boost::false_type {};
-template <class T> struct is_nothrow_move_constructible<const volatile T> : public ::boost::false_type{};
-template <class T, std::size_t N> struct is_nothrow_move_constructible<T[N]> : public ::boost::false_type{};
-template <class T> struct is_nothrow_move_constructible<T[]> : public ::boost::false_type{};
-
-#else
-
-#include <boost/type_traits/has_trivial_move_constructor.hpp>
-#include <boost/type_traits/has_nothrow_copy.hpp>
-#include <boost/type_traits/is_array.hpp>
-
-namespace boost{
-
-template <class T>
-struct is_nothrow_move_constructible
- : public integral_constant<bool,
- (::boost::has_trivial_move_constructor<T>::value || ::boost::has_nothrow_copy<T>::value) && !::boost::is_array<T>::value>
-{
- BOOST_STATIC_ASSERT_MSG(boost::is_complete<T>::value, "Arguments to is_nothrow_move_constructible must be complete types");
-};
-
-#endif
-
-template <> struct is_nothrow_move_constructible<void> : false_type{};
-#ifndef BOOST_NO_CV_VOID_SPECIALIZATIONS
-template <> struct is_nothrow_move_constructible<void const> : false_type{};
-template <> struct is_nothrow_move_constructible<void volatile> : false_type{};
-template <> struct is_nothrow_move_constructible<void const volatile> : false_type{};
-#endif
-// References are always trivially constructible, even if the thing they reference is not:
-template <class T> struct is_nothrow_move_constructible<T&> : public ::boost::true_type{};
-#ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
-template <class T> struct is_nothrow_move_constructible<T&&> : public ::boost::true_type{};
-#endif
-
-} // namespace boost
-
-#endif // BOOST_TT_IS_NOTHROW_MOVE_CONSTRUCTIBLE_HPP_INCLUDED