Serhiy Storchaka <[email protected]> added the comment:
3. There is also a crash in isinstance():
>>> class BadMeta(type):
... def __instancecheck__(cls, inst):
... 1/0
...
>>> x = int | BadMeta('A', (), {})
>>> isinstance([], x)
Fatal Python error: _Py_CheckFunctionResult: a function returned a result with
an exception set
Python runtime state: initialized
Traceback (most recent call last):
File "<stdin>", line 3, in __instancecheck__
ZeroDivisionError: division by zero
The above exception was the direct cause of the following exception:
SystemError: <built-in method __instancecheck__ of types.Union object at
0x7f024bbb8960> returned a result with an exception set
Current thread 0x00007f024beb1280 (most recent call first):
File "<stdin>", line 1 in <module>
Aborted (core dumped)
----------
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<https://bugs.python.org/issue44606>
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