message: Use `hasMine()` instead of `mine()`
  If what you really want is a `bool`, then use the `bool` specific
  method.
diff: @@ -70,12 +70,12 @@ auto myield = std::bind(mine_yield, std::ref(generator));
  using TileArray = std::vector<std::vector<std::vector<Tile> > >;
  static void validateMineLocation(Point_2d& pt, TileArray& ta)
  {
  - if (ta[0][pt.y()][pt.x()].mine())
  + if (ta[0][pt.y()][pt.x()].hasMine())
  {
  for (const auto& direction : DirectionScan323)
  {
  const auto point = pt + direction;
  - if (ta[0][point.y()][point.x()].mine()) { pt = point; }
  + if (ta[0][point.y()][point.x()].hasMine()) { pt = point; }
  }
  }
  }
  