logging.LoggerAdapter missing extra instance variable

[wkschwartz]

The following test case fails. Place the following code in mypy-test.py:

import logging
from typing import Any, MutableMapping, Tuple
class Adapter(logging.LoggerAdapter):
	def process(self, msg: Any, kwargs: MutableMapping[str, Any]) -> Tuple[Any, MutableMapping[str, Any]]:
		data = self.extra['data']
		return ('%s' % data), kwargs

Then I get

$ mypy mypy-test.py 
mypy-test.py:5: error: "Adapter" has no attribute "extra"

This location should have extra: Mapping[str, Any] put right below it.

[wkschwartz]

Also missing an annotation for instance attribute logger