Difference between Cython 3.2.0 and 3.1.6?

[Fredrik Bondesson]

We have been using Cython 3.1.6 succesfully, however when trying to upgrade to 3.2.0 we ran into a problem.

The following code works on 3.1.6, however causes an AttributeError on 3.2.0:

....
Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "cython_test.pyx", line 27, in cython_test.run_it
    print(f"SomeOtherError message: {error.description()}")
AttributeError: type object 'BaseException' has no attribute 'description'

setup.py:

from distutils.core import setup

from Cython.Build import cythonize

setup(name="Cython test", ext_modules=cythonize("cython_test.pyx"))

cython_test.pyx:

class Some_Error(RuntimeError):

    def __init__(self, error_str: str = ""):

        super().__init__(f"{error_str}")

class ErrorBase(Exception):

    def __init__(self, description: str) -> None:

        Exception.__init__(self)

        self._description = description

    def description(self) -> str:

        return self._description

class SomeOtherError(ErrorBase):

    def __init__(self, description: str) -> None:

        ErrorBase.__init__(self, description)

def try_except():

    try:

        raise Some_Error("error string")

    except Some_Error as error:

        raise SomeOtherError("Some other error") from error

def run_it():

    try:

        try_except()

    except SomeOtherError as error:

        print(f"SomeOtherError message: {error.description()}")

Steps to reproduce:

# py -3.10 -m venv venv

# venv\Scripts\activate.bat

# pip install Cython==3.2.0 / pip install Cython==3.1.6

# python setup.py build_ext --inplace

# python -c "from cython_test import run_it;run_it()"

Any advice? 

Do you consider this to be a bug?

Regards Fredrik