[Python-Dev] When tp_clear returns non-zero?

[Neil Schemenauer]

On 2018-05-28, Serhiy Storchaka wrote:
> I'm interesting what the result of this function means. In what
> cases it can return non-zero, and can it set an exception?

My memory is fuzzy (nearly 20 years since I wrote that code).  My
best guess is that I thought a return value might be useful somehow.
As you have noticed, the return type probably should have been void.

If you want to see one of the first implementations of the Python
GC, I still have a patch:

    http://python.ca/nas/python/gc/gc-cycle-152.diff

Regards,

  Neil