static L<GazelleTree> gazelle_searchTreeUpwards_all(F1<GazelleTree, Bool> pred, GazelleTree tree) {
  if (tree == null) null;
  new L<GazelleTree> out;
  while ((tree = gazelle_searchTreeUpwards(pred, tree)) != null)
    out.add(tree);
  ret out;
}