[issue33714] module can set an exception in tp_clear

[Ashley Whetter]

Ashley Whetter <ashley at awhetter.co.uk> added the comment:

I've attached a reproduction case. Here's the setup.py that I used:

```
from distutils.core import Extension, setup

extension = Extension("breaky", ["breaky.c"])

setup(
    name="tp_clear",
    version="0.1.0",
    ext_modules=[extension],
)
```

which I built and ran with:
```
python setup.py build_ext --inplace
python -c "import breaky, gc; a = breaky.Breaky(); a = 1"
```

----------
nosy: +AWhetter
Added file: https://bugs.python.org/file48642/breaky.c

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<https://bugs.python.org/issue33714>
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