STINNER Victor <vstin...@python.org> added the comment:

In PR 23131, I added a comment to _PyInterpreter_Clear() to remind me that 
trying to destroy a Python type after the last GC collection doesn't work as 
expected:

    // All Python types must be destroyed before the last GC collection. Python
    // types create a reference cycle to themselves in their in their
    // PyTypeObject.tp_mro member (the tuple contains the type).

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue1635741>
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