2.1 changelog is incorrect

[mristin]

Bug Report

Hi! I've just installed mypy 2.1.0 and tried it against the snippet posted for the issue 16093 (#16093 (comment)).

It seems that the change is still not active in mypy 2.1.0?

The changelog states that the fix was implemented in 2.1.0:
https://mypy.readthedocs.io/en/stable/changelog.html#other-notable-fixes-and-improvements

Notably:
#21456

To Reproduce

Here's the content of the exact snippet I ran mypy on, just for reference:

from enum import Enum
from typing import assert_never


class MyEnum(Enum):
 A = 1
 B = 2
 C = 3


def my_function(a: MyEnum) -> bool:
 if a == MyEnum.A:
 return True
 elif a in (MyEnum.B, MyEnum.C):
 return False
 assert_never(a)


my_function(MyEnum.A)

Expected Behavior

I expected no error.

Actual Behavior

I get:

scratch_6.py:16: error: Argument 1 to "assert_never" has incompatible type "Literal[MyEnum.B, MyEnum.C]"; expected "Never" [arg-type] 
Found 1 error in 1 file (checked 1 source file)

Your Environment

$ mypy --version
mypy 2.1.0 (compiled: yes)

Command line:

mypy --strict scratch_6.py

[mristin]

@hauntsaninja can you maybe double-check?

[hauntsaninja]

Interesting, so the PR definitely makes the snippet type check (it type checks both on latest master and on a900831)

But you're right that it doesn't type check on v2.1.0. Presumably some other previous commit needed to get cherry picked... Not sure which one, but the good news is that this should actually get fixed for real with the next release

[hauntsaninja]

Okay, just took a look for real, and I think the changelog is just wrong and #21456 isn't in 2.1

[hauntsaninja]

PR to fix changelog is #21565