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Don't fail environmental check if README.md exists (but .txt and no-suffix don't)

#ifndef BOOST_MPL_AUX_BACK_IMPL_HPP_INCLUDED
#define BOOST_MPL_AUX_BACK_IMPL_HPP_INCLUDED

// Copyright Aleksey Gurtovoy 2000-2004
//
// 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)
//
// See http://www.boost.org/libs/mpl for documentation.

// $Id$
// $Date$
// $Revision$

#include <boost/mpl/begin_end.hpp>
#include <boost/mpl/next_prior.hpp>
#include <boost/mpl/deref.hpp>
#include <boost/mpl/aux_/traits_lambda_spec.hpp>

namespace boost { namespace mpl {

// default implementation, requires at least bi-directional iterators;
// conrete sequences might override it by specializing either the 
// 'back_impl' or the primary 'back' template

template< typename Tag >
struct back_impl
{
    template< typename Sequence > struct apply
    {
        typedef typename end<Sequence>::type end_;
        typedef typename prior<end_>::type last_;
        typedef typename deref<last_>::type type;
    };
};

BOOST_MPL_ALGORITM_TRAITS_LAMBDA_SPEC(1, back_impl)

}}

#endif // BOOST_MPL_AUX_BACK_IMPL_HPP_INCLUDED