Bug Report

Seeing this regression on mypy 1.16 with Enums of NamedTuples values.

Note: Enums of plain classes or dataclasses work as expected.

To Reproduce

https://mypy-play.net/?mypy=1.16.0&python=3.13&flags=strict&gist=2c5d8ca22757aee67d917d8fec20ad7f

from enum import Enum from typing import NamedTuple class Foo(NamedTuple): pass class FooEnum(Foo, Enum): ITEM = Foo() foo: Foo = FooEnum.ITEM # works on 1.15 but not 1.16

Actual Behavior

error: Incompatible types in assignment (expression has type "FooEnum", variable has type "Foo") [assignment] 

Your Environment

• Mypy version used: 1.16
• Mypy command-line flags: defaults
• Mypy configuration options from mypy.ini (and other config files): none
• Python version used: 3.13