message: algorithm/sample: remove unused default template argument on internal function
diff: @@ -39,7 +39,7 @@ namespace ranges
  struct sample_fn
  {
  private:
  - template<typename I, typename S, typename O, typename Gen = detail::default_random_engine &>
  + template<typename I, typename S, typename O, typename Gen>
  static auto sized_impl(I first, S last, iter_difference_t<I> pop_size, O out,
  iter_difference_t<I> n, Gen &&gen) ->
  sample_result<I, O>
  