Bug report

A typehint Annotated[T, x] should be interpreted as its type T if not specially handled (see typing documentation).
However, inspect.getmro() fails on Annotated[T, x], while it succeeds on T:

import inspect
import typing

print(inspect.getmro(int))
# works and outputs (<class 'int'>, <class 'object'>)

AnnotatedInt = typing.Annotated[int, 'annotation']
print(inspect.getmro(AnnotatedInt))
# fails with AttributeError: __mro__

I think this is incorrect, and that any remediation more likely should be (generically) in typing.Annotated than (as special case) in inspect.getmro().

Your environment

This fails on all Python version that support Annotated: 3.9-3.11. Tested with 3.9.13, 3.10.4, 3.11.0rc2 on Windows 11.

Linked PRs

• gh-98233: Fix Annotated[int, ...].__mro__ access #98234