[cell-var-from-loop] false positive for lambda used as keyword arg

[kowalcj0]

Bug description

Hi,

I'm little confused by this warning which pylint 2.12.2 found in the following example.py:

"""cell-var-from-loop example."""

grouped_messages = {
    "category_a": [
        {"key_a": 3},
        {"key_a": 1},
        {"key_a": 2},
    ],
    "category_b": [
        {"key_b": 5},
        {"key_b": 3},
        {"key_b": 8},
    ],
}
sorting_keys = {
    "category_a": "key_a",
    "category_b": "key_b",
}

sorted_messages = {}

for category, messages in grouped_messages.items():
    sorted_messages[category] = sorted(
        (message for message in messages),
        key=lambda msg: msg[sorting_keys[category]]
    )

print(sorted_messages)

I got rid of this warning by replacing key=lambda msg: msg[sorting_keys[category]] with key=operator.itemgetter(sorting_keys[category]).
TBH I'm not sure why pylint complains about category being defined in loop.
Especially, because both versions of the code, give exactly the same result:

python3 example.py 
{'category_a': [{'key_a': 1}, {'key_a': 2}, {'key_a': 3}], 'category_b': [{'key_b': 3}, {'key_b': 5}, {'key_b': 8}]}

This might be a continuation of: #4827

Thanks

Configuration

No response

Command used

pylint example.py

Pylint output

************* Module example
example.py:25:41: W0640: Cell variable category defined in loop (cell-var-from-loop)

------------------------------------------------------------------
Your code has been rated at 8.33/10 (previous run: 8.33/10, +0.00)

Expected behavior

No warnings

Pylint version

pylint 2.12.2
astroid 2.9.0
Python 3.10.0 (default, Oct  4 2021, 00:00:00) [GCC 11.2.1 20210728 (Red Hat 11.2.1-1)

OS / Environment

Fedora 35

Additional dependencies

astroid==2.9.0
isort==5.10.1
lazy-object-proxy==1.6.0
mccabe==0.6.1
platformdirs==2.4.0
pylint==2.12.2
toml==0.10.2
wrapt==1.13.3

[jacobtylerwalls]

Reproduced @ 27e7272.

We try to exclude lambdas that are called immediately, but we're fooled when an assumption of direct parentage is violated here:

pylint/pylint/checkers/utils.py

Lines 447 to 449 in 51c28bc

	def is_being_called(node: nodes.NodeNG) -> bool:
	"""Return True if node is the function being called in a Call node."""
	return isinstance(node.parent, nodes.Call) and node.parent.func is node

The lambda's parent is a Keyword node, and that has a parent of Call.