unused-variable and undefined-variable with walrus operator

[spagh-eddie]

Bug description

The closest open issue I could find was #7538, but this has different error codes

Curiously, if I put the offending line outside of the decorator, there is no error

def decorate(x):
    def wrapped(f):
        print(x)
        return f()
    return wrapped

original = {"key": "value", "this": "that"}

@decorate((d := original.copy()) and d.pop("key") and d)  # pylint error
def g(): print("g")

% python test.py
{'this': 'that'}
g

Configuration

No response

Command used

pylint test.py --disable=C

Pylint output

************* Module test
t.py:9:37: E0602: Undefined variable 'd' (undefined-variable)
t.py:9:54: E0602: Undefined variable 'd' (undefined-variable)
t.py:9:11: W0612: Unused variable 'd' (unused-variable)

------------------------------------------------------------------
Your code has been rated at 0.00/10 (previous run: 0.00/10, +0.00)

Expected behavior

no error

Pylint version

pylint 2.17.0
astroid 2.15.0
Python 3.10.5 (main, Jul 29 2022, 12:30:46) [Clang 13.0.0 (clang-1300.0.27.3)]

OS / Environment

% uname
Darwin

Additional dependencies

No response

[kalekundert]

In case another example is useful, it seems like you can trigger this same false-positive via pytest. Note that a decorator is involved again:

$ cat test_mwe.py
import pytest

@pytest.mark.parametrize("list_1, list_2", [([a := 1], [a])])
def test_compare(list_1, list_2):
    assert list_1 == list_2

$ pytest test_mwe.py
============================= test session starts ==============================
platform linux -- Python 3.10.0, pytest-7.2.0, pluggy-1.0.0
rootdir: /home/kale
plugins: cov-4.0.0, env-0.6.2, subtests-0.7.0, xdoctest-1.1.1, hypothesis-6.39.4, devtools-0.12.2, unordered-0.4.1, hydra-core-1.3.2, pytest_tmp_files-0.0.0, xonsh-0.12.1, anyio-3.7.0, xdist-2.5.0, forked-1.4.0, typeguard-4.0.0
collected 1 item

test_mwe.py .                                                            [100%]

============================== 1 passed in 0.03s ===============================

$ pylint test_mwe.py --disable=C
************* Module test_mwe
test_mwe.py:3:56: E0602: Undefined variable 'a' (undefined-variable)
test_mwe.py:3:46: W0612: Unused variable 'a' (unused-variable)

------------------------------------------------------------------
Your code has been rated at 0.00/10 (previous run: 0.00/10, +0.00)

$ pylint --version
pylint 3.0.2
astroid 3.0.1
Python 3.10.0 (default, Oct 20 2021, 17:23:57) [Clang 12.0.1 ]