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I recently hadpytest-dev/pytest#10466 reported, and it seems likely to be an upstream bug inexcept* - cc@iritkatriel fyi.
A somewhat simplified reproducing example:
classMyException(Exception):__hash__=None# Traditional try-except works fine with unhashable exceptions, e.g.:try:raiseExceptionGroup("Foo", [MyException("Bar")])exceptException:pass# But here we'll get a TypeError:try:raiseExceptionGroup("Foo", [MyException("Bar")])except*Exception:pass
+ Exception Group Traceback (most recent call last): | File "repro.py", line 12, in <module> | raise ExceptionGroup("Foo", [MyException("Bar")]) | ExceptionGroup: Foo (1 sub-exception) +-+---------------- 1 ----------------| MyException: Bar+------------------------------------During handling of the above exception, another exception occurred:Traceback (most recent call last): File "repro.py", line -1, in <module>TypeError:unhashable type: 'MyException'If this is the intended behavior of course we'll work around it in Pytest, but we decided to report upstream in case it's not 🙂