message: das.named: Fix clang warning.
diff: @@ -181,8 +181,7 @@ namespace das
  auto&
  get(Default& d, Effectives&& ...)
  {
  - using D = DefaultFor<true, Formal>;
  - return d.D::value;
  + return d.DefaultFor<true, Formal>::value;
  }
  };
  