unnecessary-list-index-lookup inconsistent when assigning to iterating object in iterable unpacking

[Tratori]

Bug description

# pylint: disable=missing-docstring
myList = [1, 2, 3]

for a, b in enumerate(myList):
    myList[a] = 2

for a, b in enumerate(myList):
    myList[a], _ = (2, 1)

Configuration

No response

Command used

pylint test2.py

Pylint output

************* Module test2
test2.py:8:4: R1736: Unnecessary list index lookup, use 'b' instead (unnecessary-list-index-lookup)

------------------------------------------------------------------
Your code has been rated at 8.00/10 (previous run: 8.00/10, +0.00)

Expected behavior

I would expect the output for both loops to be the same. The latter loop leads to an unnecessary-list-index-lookup though.

Pylint version

pylint 2.14.0
astroid 2.11.5
Python 3.9.12 (main, Jun  1 2022, 11:38:51) 
[GCC 7.5.0]

OS / Environment

Ubuntu 20.04

Additional dependencies

No response

[jacobtylerwalls]

Thanks for the report, the second example looks like a false positive because the assumption of direct parentage here is violated (subscript.parent is a <Tuple.tuple l.8 ...):
https://github.com/PyCQA/pylint/blob/6e6927341aa38b2153a3ca7096f1a6447e135dbf/pylint/checkers/refactoring/refactoring_checker.py#L1921

cc/ @timmartin

I also see we have similar code in three places 👀 (grep for "Early termination" to find them quickly).

[timmartin]

Thanks for the heads-up, I don't mind taking a look at this.