example: invalid_use_of_protected_member


for `state.setState` in the example

```
	"code": "invalid_use_of_protected_member",
	"message": "The member 'setState' can only be used within instance members of subclasses of 'package:flutter/src/widgets/framework.dart'.",
	"source": "dart",
	"startLineNumber": 28,
	"startColumn": 11,
```