message: changed to DCHECK(... != nullptr)
diff: @@ -63,7 +63,8 @@ class RayCaster {
  }
  bool nextRayIndex(AnyIndex* ray_index) {
  - *DCHECK_NOTNULL(ray_index) = curr_index_;
  + DCHECK(ray_index != nullptr);
  + *ray_index = curr_index_;
  bool not_at_end = curr_index_ != end_index_;
  int t_min_idx;
  