bpo-40608: restore protection against double-deallocate issue for subclasses of classes that use trashcan #20104
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…classes of classes that use trashcan
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Added a unit test that segfaults in python 3.8 and reversed the changes in typeobject.c that caused this segfault.
The segfault occurs with the old trashcan macros (Py_TRASHCAN_SAFE_BEGIN/END) and can be avoided by using the new ones (Py_TRASHCAN_BEGIN/END). The purpose of this change is to prevent segfaults in old code, it can be reversed once the old macros are removed.
https://bugs.python.org/issue40608