function atNonLazyBreak(code) {
    assert(markdownLineEnding(code), 'expected eol')
    return effects.attempt(closeStart, after, contentBefore)(code)
  }
At eol/eof in code, before a non-lazy closing fence or content.

```markdown
> | ~~~js
         ^
> | alert(1)
            ^
  | ~~~
```

@type {State}