Exception thrown when using private class method

[bugale]

Steps to reproduce

Given a file test.py:

"""Bla"""

class Bla:
    """Bla"""
    def __init__(self):
        type(self).__a()

    @classmethod
    def __a(cls):
        pass

Current behavior

Result of pylint a.py:

C:\temp>py -3 -m pylint test.py
Exception on node <ClassDef.Bla l.3 at 0x1255a3b6dc0> in file 'C:\temp\test.py'
Traceback (most recent call last):
  File "C:\Program Files\Python39\lib\runpy.py", line 197, in _run_module_as_main
    return _run_code(code, main_globals, None,
  File "C:\Program Files\Python39\lib\runpy.py", line 87, in _run_code
    exec(code, run_globals)
  File "C:\Program Files\Python39\lib\site-packages\pylint\__main__.py", line 9, in <module>
    pylint.run_pylint()
  File "C:\Program Files\Python39\lib\site-packages\pylint\__init__.py", line 24, in run_pylint
    PylintRun(sys.argv[1:])
  File "C:\Program Files\Python39\lib\site-packages\pylint\lint\run.py", line 384, in __init__
    linter.check(args)
  File "C:\Program Files\Python39\lib\site-packages\pylint\lint\pylinter.py", line 973, in check
    self._check_files(
  File "C:\Program Files\Python39\lib\site-packages\pylint\lint\pylinter.py", line 1007, in _check_files
    self._check_file(get_ast, check_astroid_module, name, filepath, modname)
  File "C:\Program Files\Python39\lib\site-packages\pylint\lint\pylinter.py", line 1033, in _check_file
    check_astroid_module(ast_node)
  File "C:\Program Files\Python39\lib\site-packages\pylint\lint\pylinter.py", line 1170, in check_astroid_module
    retval = self._check_astroid_module(
  File "C:\Program Files\Python39\lib\site-packages\pylint\lint\pylinter.py", line 1215, in _check_astroid_module
    walker.walk(ast_node)
  File "C:\Program Files\Python39\lib\site-packages\pylint\utils\ast_walker.py", line 77, in walk
    self.walk(child)
  File "C:\Program Files\Python39\lib\site-packages\pylint\utils\ast_walker.py", line 79, in walk
    callback(astroid)
  File "C:\Program Files\Python39\lib\site-packages\pylint\checkers\classes.py", line 901, in leave_classdef
    self._check_unused_private_members(node)
  File "C:\Program Files\Python39\lib\site-packages\pylint\checkers\classes.py", line 914, in _check_unused_private_members
    and attribute.expr.name in ("self", node.name)
AttributeError: 'Call' object has no attribute 'name'

Expected behavior

************* Module test
test.py:3:0: R0903: Too few public methods (0/2) (too-few-public-methods)

------------------------------------------------------------------
Your code has been rated at 8.00/10 (previous run: 2.00/10, +6.00)

pylint --version output

Result of pylint --version output:

C:\temp>py -3 -m pylint --version
pylint 2.9.1
astroid 2.6.2
Python 3.9.5 (tags/v3.9.5:0a7dcbd, May  3 2021, 17:27:52) [MSC v.1928 64 bit (AMD64)]

The issue doesn't reproduce on version 2.8.3
It started reproducing on 2.9.0 and still happens in the latest prerelease version

[cdce8p]

@bugale You should be able to use Bla.__a() or even self.__a() instead. We are currently working on a fix for type(self)