**Packages**
* `"react": "^16.13.1"`
* `"eslint-plugin-react-hooks": "^4.0.8"`

The issue #18819 still happens with `eslint-plugin-react-hooks@4.0.8`.

Using the example code from the other issue gives the following errors:

![image](https://user-images.githubusercontent.com/37122343/90794940-59d9a980-e305-11ea-9ec0-98f69b41c280.png)

![image](https://user-images.githubusercontent.com/37122343/90795019-770e7800-e305-11ea-92b8-b64407b0b22c.png)


return {
    message:
      `React Hook "${hook}" is called in function "${fn}" that is neither ` +
      'a React function component nor a custom React Hook function.' +
      ' React component names must start with an uppercase letter.',
  };
}
function genericError(hook) {
  return {
    message:
      `React Hook "${hook}" cannot be called inside a callback. React Hooks ` +
      'must be called in a React function component or a custom React ' +
      'Hook function.',
  };
}
function topLevelError(hook) {
  return {
    message:
      `React Hook "${hook}" cannot be called at the top level. React Hooks ` +
      'must be called in a React function component or a custom React ' +
      'Hook function.',
  };
}
function classError(hook) {
  return {
    message:
      `React Hook "${hook}" cannot be called in a class component. React Hooks ` +
      'must be called in a React function component or a custom React ' +
      'Hook function.',