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boost::proto::env_var — 
          For fetching the value from a transform environment corresponding to the
          specified Key.
        
// In header: <boost/proto/transform/env.hpp> template<typename Key, typename Env> typename proto::result_of::env_var<Env &, Key>::type env_var(Env & e); template<typename Key, typename Env> typename proto::result_of::env_var<Env const &, Key>::type env_var(Env const & e);