$ comrak -e block-directive
:::warning
A paragraph.

- item one
- item two
:::
$ comrak -e block-directive
:::foo bar
Paragraph 1

Paragraph 2
:::
$ comrak -e block-directive
:::foo bar
> a
:::
$ comrak -e block-directive
> :::foo bar
> a
> :::
$ comrak -e block-directive
- item one

  :::foo bar
  Paragraph 1

  Paragraph 2
  :::
- item two
$ comrak -e block-directive
::::outer
:::inner
Paragraph
:::
::::