fix garbage collection in inheritance cases #4563
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After looking at GC code recently in #4479 I had a nagging feeling that inheritance might also be a problem with
__traverse__
.I finally had some time to follow up on that thought today, and it turns out that indeed in cases of
#[pyclass(extends = ...)]
then we are currently not traversing the base class (or calling its'__clear__
function).This PR fixes that, by modifying the generated code for both
__traverse__
and__clear__
to call the base type's function.Both of the new tests currently fail on
main
. I think this probably should be patched as 0.22.4, as this is just a straight-up memory leak for all inheritance cases otherwise :(