pandoc-3.12.1: test/command/11939.md

```
% pandoc -f native -t markdown
[ Table ("", [], [])
    (Caption Nothing [Plain [Str "Caption"]])
    [(AlignDefault, ColWidth 1)]
    (TableHead ("", [], [])
      [Row ("", [], [])
        [Cell ("", [], []) AlignDefault (RowSpan 1) (ColSpan 1)
          [Plain [Str "x"]]]])
    [TableBody ("", [], []) (RowHeadColumns 0) [] []]
    (TableFoot ("", [], []) [])
]
^D
+-----------------------------------------------------------------------+
| x                                                                     |
+=======================================================================+

: Caption
```