message: das.cli: Fix default value access wrt to das updates.
diff: @@ -670,7 +670,7 @@ namespace das
  elle::meta::static_if<Defaults::template default_for<Formal>::has>
  ([&s] (auto const& defaults)
  {
  - auto const& v = defaults.Symbol::value;
  + auto const& v = defaults.Symbol::ByConstRef::value;
  if (!std::is_same<decltype(v), bool const&>::value &&
  !std::is_same<decltype(v), boost::none_t const&>::value)
  elle::fprintf(s, " (default: %s)", v);
  