Dennis Sweeney <sweeney.dennis...@gmail.com> added the comment:
For clarification, the existing behavior on master:
When trying to raise the exception H,
F -> G -> H -> I -> NULL
becomes
H -> F -> G -> NULL
But when trying to set the exception A on top of
B -> C -> D -> E -> C -> ...,
it gets stuck in an infinite loop from the existing cycle.
My PR 20539 keeps the first behavior and resolves the infinite loop by making it
A -> B -> C -> D -> E -> NULL,
which seems consistent with the existing behavior.
So it should be strictly a bugfix. It also only changes the PyErr_SetObject
code and not the PyException_SetContext code.
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nosy: +Dennis Sweeney
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<https://bugs.python.org/issue25782>
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