message: Fix -Wextra-semi-stmt: remove unnecessary semicolon.
  This is a warning introduced in newer versions of clang.
diff: @@ -186,7 +186,7 @@ namespace ranges
  return accumulate(view::transform(outer_, ranges::size), size_type{0}) +
  (range_cardinality<Rng>::value == 0 ?
  0 :
  - ranges::size(val_) * (range_cardinality<Rng>::value - 1));;
  + ranges::size(val_) * (range_cardinality<Rng>::value - 1));
  }
  private:
  friend range_access;
  