```
% pandoc -f native -t rst
[Div ("",["warning"],[])
 [Div ("",["title"],[])
  [Para [Str "Warning"]]
 ,Para [Str "Hi"]]]
^D
.. warning::

   Hi
```
```
% pandoc -f native -t rst
[Div ("",["unknown"],[])
 [Para [Str "Hi"]]]
^D
.. container:: unknown

   Hi
```
