title: TypeError: Parameters to generic types must be types. Got Ellipsis
body: <pre><code>def get_list_from_tuple(board: Tuple[Tuple[Optional[int], ...], ...]) -&gt; List[List[Optional[int], ...], ...]:
      return list(list(x) for x in board)
  </code></pre>
  
  <p>Why am I getting the error "TypeError: Parameters to generic types must be types. Got Ellipsis." for this function??</p>