function start(code) {
    assert(code === codes.graveAccent, 'expected `` ` ``')
    assert(previous.call(self, self.previous), 'expected correct previous')
    effects.enter(types.codeText)
    effects.enter(types.codeTextSequence)
    return sequenceOpen(code)
  }
Start of code (text).

```markdown
> | `a`
    ^
> | \`a`
     ^
```

@type {State}