mypy 0.990 fails self test using Debian Python 3.10.8

[mr-c]

Bug Report

(A clear and concise description of what the bug is.)

To Reproduce

Check out the v0.990 tag and run ./runtests.py

Expected Behavior

The self tests pass
Actual Behavior

$ ./runtests.py 
run self: ['/usr/bin/python3', '-m', 'mypy', '--config-file', 'mypy_self_check.ini', '-p', 'mypy']
mypy/fastparse.py:1047: error: If condition is always false  [redundant-expr]
                        a, kd, ARG_NAMED if kd is None else ARG_NAMED_OPT, no_type_check
                                            ^~~~~~~~~~
Found 1 error in 1 file (checked 167 source files)

FAILED: self

Your Environment

$ /usr/bin/python3 -V
Python 3.10.8

• Mypy version used: 0.990
• Mypy command-line flags:
• Mypy configuration options from mypy.ini (and other config files):
• Python version used: 3.10.8

[AlexWaygood]

What version of types-typed-ast do you have installed in your environment?

[AlexWaygood]

If you have types-typed-ast<1.5.8 installed locally, you'll need to run pip install -r test-requirements.txt again locally. It's now pinned to >=1.5.8 in CI:

mypy/build-requirements.txt

Line 5 in 39d35cd

types-typed-ast>=1.5.8,<1.6.0

[mr-c]

Thanks @AlexWaygood
This is in the context of updating the mypy package for Debian, so we get types-typed-ast from a package we call python3-typeshed which is built from a 2022-06-10 snapshot of https://github.com/python/typeshed/tree/ad48606a0d901d907f2428917d7a5f97959b4733

I'll see about updating the python3-typeshed package in Debian to something newer

[AlexWaygood]

In order for mypy selftest to pass, it'll need to be a copy of typeshed with python/typeshed@c72c9a6 (a commit on August 29) included 🙂

[mr-c]

That worked, thank you @AlexWaygood !

[AlexWaygood]

Great to hear!