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When this program is invoked as a script (`python reproducer.py`), the __del__ is never called:
---
class ClassWithDel:
 def __del__(self):
 print('__del__ called')
a = ClassWithDel()
a.link = a
raise SystemExit(0)
---
Raising a different exception, moving the code to a function, importing the module, or invoking with -m (or even -c), causes __del__ to be called normally.