function start(code) {
    assert(markdownLineEnding(code), 'expected a line ending')
    effects.enter(types.lineEnding)
    effects.consume(code)
    effects.exit(types.lineEnding)
    return effects.attempt(blankLine, ok, nok)
  }
Before eol, expecting blank line.

```markdown
> | <div>
         ^
  |
```

@type {State}