[issue35983] tp_dealloc trashcan shouldn't be called for subclasses

[Jeroen Demeyer]

Jeroen Demeyer <j.deme...@ugent.be> added the comment:

The problem is easily reproduced with Cython:

cdef class List(list):
    cdef int deallocated
    
    def __dealloc__(self):
        if self.deallocated:
            print("Deallocated twice!")
        self.deallocated = 1
        
L = None
for i in range(10**4):
    L = List((L,))
del L

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<https://bugs.python.org/issue35983>
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