Message 177794 - Python tracker

The attached file `heaptype_refcnt_testcases.py` runs through several test cases (ssl.SSLError, a subclass of ssl.SSLError, and xxlimited.Xxo) seeing if references are leaked in each instance.

Unfortunately `xxlimited.Xxo` isn't set to be a base type and I don't know of any other types in the default install which use PyType_FromSpec with a custom tp_dealloc.