MatchAs object has no attribute assigned_stmts

[cheesycod]

No

Steps to reproduce

Try doing pylint on this (no idea what lines are causing it tho: https://github.com/Fates-List/FatesList/blob/main/modules/core/system.py)

Current behavior

pylint crashes with MatchAs object has no attribute assigned_stmts

Result of pylint a.py:

************* Module modules.core.system
Exception on node <Compare l.318 at 0x7f4e15e8e380> in file '/home/meow/FatesList/modules/core/system.py'
Traceback (most recent call last):
  File "/home/meow/flvenv/bin/pylint", line 8, in <module>
    sys.exit(run_pylint())
  File "/home/meow/flvenv/lib64/python3.10/site-packages/pylint/__init__.py", line 24, in run_pylint
    PylintRun(sys.argv[1:])
  File "/home/meow/flvenv/lib64/python3.10/site-packages/pylint/lint/run.py", line 384, in __init__
    linter.check(args)
  File "/home/meow/flvenv/lib64/python3.10/site-packages/pylint/lint/pylinter.py", line 973, in check
    self._check_files(
  File "/home/meow/flvenv/lib64/python3.10/site-packages/pylint/lint/pylinter.py", line 1007, in _check_files
    self._check_file(get_ast, check_astroid_module, name, filepath, modname)
  File "/home/meow/flvenv/lib64/python3.10/site-packages/pylint/lint/pylinter.py", line 1033, in _check_file
    check_astroid_module(ast_node)
  File "/home/meow/flvenv/lib64/python3.10/site-packages/pylint/lint/pylinter.py", line 1170, in check_astroid_module
    retval = self._check_astroid_module(
  File "/home/meow/flvenv/lib64/python3.10/site-packages/pylint/lint/pylinter.py", line 1215, in _check_astroid_module
    walker.walk(ast_node)
  File "/home/meow/flvenv/lib64/python3.10/site-packages/pylint/utils/ast_walker.py", line 77, in walk
    self.walk(child)
  File "/home/meow/flvenv/lib64/python3.10/site-packages/pylint/utils/ast_walker.py", line 77, in walk
    self.walk(child)
  File "/home/meow/flvenv/lib64/python3.10/site-packages/pylint/utils/ast_walker.py", line 77, in walk
    self.walk(child)
  [Previous line repeated 3 more times]
  File "/home/meow/flvenv/lib64/python3.10/site-packages/pylint/utils/ast_walker.py", line 74, in walk
    callback(astroid)
  File "/home/meow/flvenv/lib64/python3.10/site-packages/pylint/checkers/base.py", line 2536, in visit_compare
    self._check_callable_comparison(node)
  File "/home/meow/flvenv/lib64/python3.10/site-packages/pylint/checkers/base.py", line 2518, in _check_callable_comparison
    sum(
  File "/home/meow/flvenv/lib64/python3.10/site-packages/pylint/checkers/base.py", line 2521, in <genexpr>
    if isinstance(utils.safe_infer(operand), bare_callables)
  File "/home/meow/flvenv/lib64/python3.10/site-packages/pylint/checkers/utils.py", line 1175, in safe_infer
    value = next(infer_gen)
  File "/home/meow/flvenv/lib64/python3.10/site-packages/astroid/node_classes.py", line 353, in infer
    yield from self._infer(context, **kwargs)
  File "/home/meow/flvenv/lib64/python3.10/site-packages/astroid/decorators.py", line 136, in raise_if_nothing_inferred
    yield next(generator)
  File "/home/meow/flvenv/lib64/python3.10/site-packages/astroid/decorators.py", line 100, in wrapped
    res = next(generator)
  File "/home/meow/flvenv/lib64/python3.10/site-packages/astroid/bases.py", line 144, in _infer_stmts
    for inferred in stmt.infer(context=context):
  File "/home/meow/flvenv/lib64/python3.10/site-packages/astroid/node_classes.py", line 367, in infer
    for i, result in enumerate(generator):
  File "/home/meow/flvenv/lib64/python3.10/site-packages/astroid/decorators.py", line 136, in raise_if_nothing_inferred
    yield next(generator)
  File "/home/meow/flvenv/lib64/python3.10/site-packages/astroid/decorators.py", line 97, in wrapped
    generator = _func(node, context, **kwargs)
  File "/home/meow/flvenv/lib64/python3.10/site-packages/astroid/inference.py", line 860, in infer_assign
    stmts = list(self.assigned_stmts(context=context))
  File "/home/meow/flvenv/lib64/python3.10/site-packages/astroid/protocols.py", line 308, in assend_assigned_stmts
    return self.parent.assigned_stmts(node=self, context=context)
AttributeError: 'MatchAs' object has no attribute 'assigned_stmts'

Expected behavior

pylint --version output

Result of pylint --version output:

pylint 2.9.4-dev0
astroid 2.6.3-dev0
Python 3.10.0b3 (default, Jun 17 2021, 00:00:00) [GCC 11.1.1 20210531 (Red Hat 11.1.1-3)]

[Pierre-Sassoulas]

Thank you for opening the issue, I can reproduce the crash.

[cdce8p]

I can reproduce it as well. This seems to be enough:

msg = 42

match msg:
    case _ as var:
        if var != 2:
            pass