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

// Copyright Daniel Wallin, David Abrahams 2010. Use, modification and
// distribution is 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)

#ifndef BOOST_PARAMETER_IS_MAYBE_050329_HPP
#define BOOST_PARAMETER_IS_MAYBE_050329_HPP

#include <boost/type_traits/is_base_and_derived.hpp>

namespace boost {
namespace parameter {
namespace aux {

struct maybe_base {};

template <class T>
struct is_maybe
  : is_base_and_derived<maybe_base, T>
{};

} // namespace aux
} // namespace parameter
} // namespace boost

#endif // BOOST_PARAMETER_IS_MAYBE_050329_HPP