message: Fixed compiler warning.
diff: @@ -63,8 +63,7 @@ class RayCaster {
  }
  bool nextRayIndex(AnyIndex* ray_index) {
  - CHECK_NOTNULL(ray_index);
  - *ray_index = curr_index_;
  + *DCHECK_NOTNULL(ray_index) = curr_index_;
  bool not_at_end = curr_index_ != end_index_;
  int t_min_idx;
  