Seems I can't "unforget" erroneously forgotten files, so will have to forget them and then re-add them
// (C) Copyright Steve Cleary, Beman Dawes, Howard Hinnant & John Maddock 2000.
// 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/utility for most recent version including documentation.
// See boost/detail/call_traits.hpp and boost/detail/ob_call_traits.hpp
// for full copyright notices.
#ifndef BOOST_CALL_TRAITS_HPP
#define BOOST_CALL_TRAITS_HPP
#ifndef BOOST_CONFIG_HPP
#include <boost/config.hpp>
#endif
#ifdef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
#include <boost/detail/ob_call_traits.hpp>
#else
#include <boost/detail/call_traits.hpp>
#endif
#endif // BOOST_CALL_TRAITS_HPP