typing.get_type_hints fails when used with a class defined in a documentation test

test_PEP563_annotations.py

#!/usr/bin/env python3 -m doctest
from __future__ import annotations

import typing

def f(clazz):
    """
    >>> class MyClass:
    ...   pass
    >>> class MyOtherClass:
    ...   my_field: MyClass
    >>> f(MyOtherClass)
    """
    typing.get_type_hints(clazz)

test_recursive.py

#!/usr/bin/env python3 -m doctest
import typing

def f(clazz):
    """
    >>> class MyClass:
    ...   my_field: 'MyClass'
    >>> f(MyClass)
    """
    typing.get_type_hints(clazz)