[issue1566] sock_type doesn't have GC although it can contain a PyObject*

[Amaury Forgeot d'Arc]

Amaury Forgeot d'Arc added the comment:

But there is not PyObject* in this struct. errorhandler is a pointer to
a C function returning a PyObject*; it cannot create a reference cycle.

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nosy: +amaury.forgeotdarc

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