Irit Katriel <iritkatr...@gmail.com> added the comment:
Like Dennis' patch, mine changes PyErr_SetObject. The difference is that
Dennis' patch gets rid of the cycle while mine leaves it as it is, just avoids
hanging on it.
So in this case:
when trying to set the exception A on top of
B -> C -> D -> E -> C -> ...,
The result would be simply
A -> B -> C -> D -> E -> C -> ...,
As I said in msg391637, a pre-existing cycle is due to a bug somewhere, and I
don't think PyErr_SetObject can or should try to fix that bug. Nonsense in,
nonsense out. If we change it we probably just make it more nonsensical.
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<https://bugs.python.org/issue25782>
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