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import gc
import weakref
class LateFin:
__slots__ = ('ref',)
def __del__(self):
# 8. Now `latefin`'s finalizer is called. Here we
# obtain a reference to `func`, which is currently
# undergoing `tp_clear`.
global func
func = self.ref()
class Cyclic(tuple):
__slots__ = ()
# 4. The finalizers of all garbage objects are called. In
# this case this is only us as `func` doesn't have a
# finalizer.
def __del__(self):
# 5. Create a weakref to `func` now. If we had created
# it earlier, it would have been cleared by the
# garbage collector before calling the finalizers.
self[1].ref = weakref.ref(self[0])
# 6. Drop the global reference to `latefin`. The only
# remaining reference is the one we have.
global latefin
del latefin
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# reference to `Cyclic`, which gets `tp_dealloc`-ed.
# This drops the last reference to `latefin`.
latefin = LateFin()
def func():
pass
cyc = tuple.__new__(Cyclic, (func, latefin))
# 1. Create a reference cycle of `cyc` and `func`.
func.__module__ = cyc
# 2. Make the cycle unreachable, but keep the global reference
# to `latefin` so that it isn't detected as garbage. This
# way its finalizer will not be called immediately.
del func, cyc
# 3. Invoke garbage collection,
# which will find `cyc` and `func` as garbage.
gc.collect()
# 9. Previously, this would crash because `func_qualname`
# had been NULL-ed out by func_clear().
print(f"{func=}")
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