Seems I can't "unforget" erroneously forgotten files, so will have to forget them and then re-add them
// (C) Copyright John Maddock 2005.
// 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_HAS_VIRTUAL_DESTRUCTOR_HPP_INCLUDED
#define BOOST_TT_HAS_VIRTUAL_DESTRUCTOR_HPP_INCLUDED
#include <boost/type_traits/intrinsics.hpp>
// should be the last #include
#include <boost/type_traits/detail/bool_trait_def.hpp>
namespace boost {
BOOST_TT_AUX_BOOL_TRAIT_DEF1(has_virtual_destructor,T,BOOST_HAS_VIRTUAL_DESTRUCTOR(T))
} // namespace boost
#include <boost/type_traits/detail/bool_trait_undef.hpp>
#endif // BOOST_TT_IS_MEMBER_FUNCTION_POINTER_HPP_INCLUDED