-- input --
Text.

1. Not a list
2. because it is
3. unindented.

4. This one
  is a list
  because of the indented text.
5. More wrapped
  items.
6. And unwrapped.

7. The blank line stops the heuristic.
-- gofmt --
Text.

1. Not a list
2. because it is
3. unindented.

 4. This one
    is a list
    because of the indented text.
 5. More wrapped
    items.
 6. And unwrapped.

7. The blank line stops the heuristic.