import inspect
import functools
from unittest import TestCase
import unittest.mock as mk

class TestIsinstance(TestCase):
    def test_mk(self):
        def foo(): pass
        with mk.patch.object(functools, "partial", autospec=True):
            inspect.signature(foo)

E
======================================================================
ERROR: test_mk (test.TestIsinstance.test_mk)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/private/tmp/reprod/test.py", line 10, in test_mk
    inspect.signature(foo)
    ~~~~~~~~~~~~~~~~~^^^^^
  File "/Users/clm/.pyenv/versions/3.13.0b3/lib/python3.13/inspect.py", line 3333, in signature
    return Signature.from_callable(obj, follow_wrapped=follow_wrapped,
           ~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
                                   globals=globals, locals=locals, eval_str=eval_str)
                                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/clm/.pyenv/versions/3.13.0b3/lib/python3.13/inspect.py", line 3059, in from_callable
    return _signature_from_callable(obj, sigcls=cls,
                                    follow_wrapper_chains=follow_wrapped,
                                    globals=globals, locals=locals, eval_str=eval_str)
  File "/Users/clm/.pyenv/versions/3.13.0b3/lib/python3.13/inspect.py", line 2559, in _signature_from_callable
    if isinstance(obj, functools.partial):
       ~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^
TypeError: isinstance() arg 2 must be a type, a tuple of types, or a union

----------------------------------------------------------------------
Ran 1 test in 0.002s

FAILED (errors=1)