'_CData' not found in <ClassDef.Union l.None at 0x7fb308fdb650>.

[WAvdBeek]

Bug description

internal crash when doing a pylint run

full details here:

https://github.com/KNX-IOT/KNX-IOT-STACK/runs/5733695443?check_suite_focus=true

Configuration

blank

Command used

see github action

Pylint output

pylint crashed with a ``NameInferenceError`` and with the following stacktrace:

Traceback (most recent call last):
  File "/opt/hostedtoolcache/Python/3.7.12/x64/lib/python3.7/site-packages/pylint/lint/pylinter.py", line 1111, in _check_files
    self._check_file(get_ast, check_astroid_module, file)
  File "/opt/hostedtoolcache/Python/3.7.12/x64/lib/python3.7/site-packages/pylint/lint/pylinter.py", line 1146, in _check_file
    check_astroid_module(ast_node)
  File "/opt/hostedtoolcache/Python/3.7.12/x64/lib/python3.7/site-packages/pylint/lint/pylinter.py", line 1299, in check_astroid_module
    ast_node, walker, rawcheckers, tokencheckers
  File "/opt/hostedtoolcache/Python/3.7.12/x64/lib/python3.7/site-packages/pylint/lint/pylinter.py", line 1345, in _check_astroid_module
    walker.walk(node)
  File "/opt/hostedtoolcache/Python/3.7.12/x64/lib/python3.7/site-packages/pylint/utils/ast_walker.py", line 76, in walk
    self.walk(child)
  File "/opt/hostedtoolcache/Python/3.7.12/x64/lib/python3.7/site-packages/pylint/utils/ast_walker.py", line 76, in walk
    self.walk(child)
  File "/opt/hostedtoolcache/Python/3.7.12/x64/lib/python3.7/site-packages/pylint/utils/ast_walker.py", line 73, in walk
    callback(astroid)
  File "/opt/hostedtoolcache/Python/3.7.12/x64/lib/python3.7/site-packages/pylint/checkers/classes/class_checker.py", line 1095, in visit_functiondef
    self._check_init(node, klass)
  File "/opt/hostedtoolcache/Python/3.7.12/x64/lib/python3.7/site-packages/pylint/checkers/classes/class_checker.py", line 2004, in _check_init
    for inf_base in base.infer():
  File "/opt/hostedtoolcache/Python/3.7.12/x64/lib/python3.7/site-packages/astroid/nodes/node_ng.py", line 168, in infer
    yield from self._infer(context=context, **kwargs)
  File "/opt/hostedtoolcache/Python/3.7.12/x64/lib/python3.7/site-packages/astroid/decorators.py", line 136, in raise_if_nothing_inferred
    yield next(generator)
  File "/opt/hostedtoolcache/Python/3.7.12/x64/lib/python3.7/site-packages/astroid/decorators.py", line 105, in wrapped
    for res in _func(node, context, **kwargs):
  File "/opt/hostedtoolcache/Python/3.7.12/x64/lib/python3.7/site-packages/astroid/inference.py", line 213, in infer_name
    name=self.name, scope=self.scope(), context=context
astroid.exceptions.NameInferenceError: '_CData' not found in <ClassDef.Union l.None at 0x7fb308fdb650>.

Expected behavior

no crash

Pylint version

python 3.7 (but also on others)

OS / Environment

Linux (on github)

Additional dependencies

see github action.

[jacobtylerwalls]

Thanks for the report, bisected it to 6977e48. Does not appear to require an astroid update, just catching the InferenceError.

Reproducer (with --disable=missing-docstring --disable=empty-docstring)

from ctypes import Union

class MyUnion(Union):
    def __init__(self):
        pass

[jacobtylerwalls]

@DanielNoord would you have any interest to take a look?

[DanielNoord]

I'll have a look tonight.