message: Remove an incorrect iterator increment
  `it` may have been invalidated at this point, making the iteration
  illegal. This was harmless but pointless and VC++'s iterator debugging
  complains about it.
diff: @@ -77,7 +77,6 @@ void CollectionChangeBuilder::merge(CollectionChangeBuilder&& c)
  old.to = it->to;
  *it = c.moves.back();
  c.moves.pop_back();
  - ++it;
  return false;
  }
  