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HITTOP_PARSER((typename First, typename Second), Concat, (First, Second)) {
    auto first_result = Parse<First>(input);
    if (first_result.error()) {
      return first_result;
    } else {
      auto remaining_input =
          boost::make_iterator_range(first_result.get(), std::end(input));
      return Parse<Second>(std::move(remaining_input));
    }
}

HITTOP_PARSER_ALIAS((typename T), (AtMost<0, T>), Success);
HITTOP_PARSER_ALIAS((typename T), (AtMost<1, T>), Opt<T>);

template <_UNBOUND_PARAMS_DECL_> class Parser<_GRAMMAR_<_ALL_PARAMS_>> {
public:
  template <typename Range>
  auto operator()(const Range &input) const
      -> Fallible<decltype(std::begin(input))> {
     _IMPLEMENTATION_
  }
};