function inside(code) {
    // ASCII punctuation.
    if (asciiPunctuation(code)) {
      effects.enter(types.characterEscapeValue)
      effects.consume(code)
      effects.exit(types.characterEscapeValue)
      effects.exit(types.characterEscape)
      return ok
    }

    return nok(code)
  }
After `\`, at punctuation.

```markdown
> | a\*b
      ^
```

@type {State}