anchor.diff:          {Mbrs, Poss} = lists:unzip(Nodes),
           % Poss might be actual nodes, if it is a leaf node. Then they
           % are already wrapped in a list.
  -?debugVal(Poss),
           Poss2 = if
               is_list(hd(Poss)) -> hd(Poss);
               true -> Poss
           end,
  -?debugVal(Poss2),
           Mbr = vtree:calc_mbr(Mbrs),
           [{Mbr, Poss2}|Acc]
       end, [], NewChildren3)),
  
positive.code:     LeafDepths6 = vtreestats:leaf_depths(Fd, ResultPos6),
      ?assertEqual([3], LeafDepths6).
  
  %-endif.
  
negative.code: 
  %%%%% Tests %%%%%
  
  -ifdef(runnall).
  
  % XXX vmx: tests with function (check_list/6 ) are missing
  chunk_list_test() ->
  