[issue25782] CPython hangs on error __context__ set to the error itself

[Nikita Sobolev]

Nikita Sobolev <mail at sobolevn.me> added the comment:

There's also a similar case with python3.9:

```python
>>> class MyError(Exception):
...   ...
... 
>>> e = MyError('e')
>>> e.__context__ = e
>>> 
>>> try:
...   raise e
... except MyError:
...   print('done')
... 
done  # hangs after this
^C^Z
```

The same code works with python3.8
We got hit by this in RustPython: https://github.com/RustPython/RustPython/pull/2820

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nosy: +sobolevn

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<https://bugs.python.org/issue25782>
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