text: 
  #if !BOOST_PHOENIX_IS_ITERATING
  
  #ifndef BOOST_PHOENIX_CORE_EXPRESSION_HPP
  #define BOOST_PHOENIX_CORE_EXPRESSION_HPP
  
  #include <boost/phoenix/core/limits.hpp>
  #include <boost/call_traits.hpp>
  #include <boost/fusion/sequence/intrinsic/at.hpp>
  #include <boost/phoenix/core/as_actor.hpp>
  #include <boost/phoenix/core/detail/expression.hpp>
  #include <boost/phoenix/core/domain.hpp>
  #include <boost/phoenix/support/iterate.hpp>
  #include <boost/preprocessor/comparison/equal.hpp>
  #include <boost/proto/domain.hpp>
  #include <boost/proto/make_expr.hpp>
  #include <boost/proto/transform/pass_through.hpp>
  
  #if !defined(BOOST_PHOENIX_DONT_USE_PREPROCESSED_FILES)
  
  #include <boost/phoenix/core/preprocessed/expression.hpp>
  
  #else
  
  #if defined(__WAVE__) && defined(BOOST_PHOENIX_CREATE_PREPROCESSED_FILES)
  #pragma wave option(preserve: 2, line: 0, output: "preprocessed/expression_" BOOST_PHOENIX_LIMIT_STR ".hpp")
  #endif
  
  /*=============================================================================
      Copyright (c) 2005-2010 Joel de Guzman
      Copyright (c) 2010 Eric Niebler
      Copyright (c) 2010 Thomas Heller
  
      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)
  ==============================================================================*/
  
  #if defined(__WAVE__) && defined(BOOST_PHOENIX_CREATE_PREPROCESSED_FILES)
  #pragma wave option(preserve: 1)
  #endif
  
  namespace boost { namespace phoenix
  {
      template <typename Expr> struct actor;
      
      template <
          template <typename> class Actor
        , typename Tag
        , BOOST_PHOENIX_typename_A_void(BOOST_PHOENIX_COMPOSITE_LIMIT)
        , typename Dummy = void>
      struct expr_ext;
  
      template <
          typename Tag
        , BOOST_PHOENIX_typename_A_void(BOOST_PHOENIX_COMPOSITE_LIMIT)
        , typename Dummy = void
      >
      struct expr : expr_ext<actor, Tag, BOOST_PHOENIX_A(BOOST_PHOENIX_COMPOSITE_LIMIT)> {};
  
  #define M0(Z, N, D)                                                             \
      BOOST_PP_COMMA_IF(N)                                                        \
      typename proto::detail::uncvref<typename call_traits<BOOST_PP_CAT(A, N)>::value_type>::type
  
  #define M1(Z, N, D)                                                             \
      BOOST_PP_COMMA_IF(N) typename call_traits<BOOST_PP_CAT(A, N)>::param_type BOOST_PP_CAT(a, N)
  
  #define BOOST_PHOENIX_ITERATION_PARAMS                                          \
      (3, (1, BOOST_PHOENIX_COMPOSITE_LIMIT,                                      \
      <boost/phoenix/core/expression.hpp>))                                       \
  /**/
      #include BOOST_PHOENIX_ITERATE()
  
  #undef M0
  #undef M1
  
  }}
  
  #if defined(__WAVE__) && defined(BOOST_PHOENIX_CREATE_PREPROCESSED_FILES)
  #pragma wave option(output: null)
  #endif
  
  #endif // PHOENIX_DONT_USE_PREPROCESSED_FILES
  
  #endif
  
  #else
      template <template <typename> class Actor, typename Tag, BOOST_PHOENIX_typename_A>
      struct expr_ext<Actor, Tag, BOOST_PHOENIX_A>
          : proto::transform<expr_ext<Actor, Tag, BOOST_PHOENIX_A>, int>
      {
          typedef
              typename proto::result_of::make_expr<
                  Tag
                , proto::basic_default_domain
                , BOOST_PP_REPEAT(BOOST_PHOENIX_ITERATION, M0, _)
              >::type
              base_type;
  
          typedef Actor<base_type> type;
  
          typedef
              typename proto::nary_expr<Tag, BOOST_PHOENIX_A>::proto_grammar
              proto_grammar;
          
          static type make(BOOST_PP_REPEAT(BOOST_PHOENIX_ITERATION, M1, _))
          {
              actor<base_type> const e =
                  {
                      proto::make_expr<
                          Tag
                        , proto::basic_default_domain
                      >(BOOST_PHOENIX_a)
                  };
              return e;
          }
  
          template<typename Expr, typename State, typename Data>
          struct impl
            : proto::pass_through<expr_ext>::template impl<Expr, State, Data>
          {};
          
          typedef Tag proto_tag;
      #define BOOST_PHOENIX_ENUM_CHILDREN(_, N, __)                               \
          typedef BOOST_PP_CAT(A, N) BOOST_PP_CAT(proto_child, N);                \
      /**/
          BOOST_PP_REPEAT(BOOST_PHOENIX_ITERATION, BOOST_PHOENIX_ENUM_CHILDREN, _)
      #undef BOOST_PHOENIX_ENUM_CHILDREN
      };
  
  #endif
  