@Override
    public boolean equals(Object o) {
      if (this == o) return true;
      if (o == null || getClass() != o.getClass()) return false;
      MappedRoot other = (MappedRoot)o;
      return Objects.equals(vcs, other.vcs) &&
             mapping.equals(other.mapping) &&
             root.equals(other.root);
    }
@Override
    public boolean equals(Object o)