[issue33418] Memory leaks in functions

[STINNER Victor]

STINNER Victor <vstinner at python.org> added the comment:

> But I am worrying about func.func_closure.  Can it create cyclic reference in real life applications?

remove.__closure__ is part of a reference cycle in bpo-38006.

I like func_clear() (which is still implemented in the master branch), but we need to understand why/how it was possible *crash Python* in bpo-38006.

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