False positive: Tuple claimed unsubscriptable when using NewType

[Kwasniok]

Bug description

# pylint: disable=C0114,W0104

from typing import NewType

MyTuple = NewType("T", tuple[float, float])
x = MyTuple((1.1, 2.2))
x[0]

Configuration

No response

Command used

pylint test.py

Pylint output

************* Module test
test.py:7:0: E1136: Value 'x' is unsubscriptable (unsubscriptable-object)


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Your code has been rated at 3.75/10 (previous run: 3.75/10, +0.00)

Expected behavior

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Your code has been rated at 10.00/10 (previous run: 10.00/10, +0.00)

Pylint version

pylint 2.10.2
astroid 2.7.2
Python 3.9.6 (default, Jun 30 2021, 10:22:16) 
[GCC 11.1.0]

OS / Environment

cat /proc/version
Linux version 5.13.10-arch1-1 (linux@archlinux) (gcc (GCC) 11.1.0, GNU ld (GNU Binutils) 2.36.1) #1 SMP PREEMPT Thu, 12 Aug 2021 21:59:14 +0000

Additional dependencies

None

[ggirdler]

Hi, I'd like to take a look at this issue

[Pierre-Sassoulas]

Neat, I assigned you to the issue, to not hesitate to ask for help here or in a draft merge request :)

[Kwasniok]

Thank you guys! I am really happy someone is taking a look at this : )

[cdce8p]

@ggirdler Just a heads up. This is a more advanced issue. It will require a custom inference tip in astroid. If that's your first time working with the pylint and astroid internals, this might not be the right one for you.