Antoine Pitrou wrote:
> You're right that a Py_DECREF is missing there.  However, it seems unlikely that this is triggering the test failure, because `PyList_New(1)` will practically never fail in normal conditions (and even making it deliberately fail would be quite difficult).

Thanks for clarifying; spotting refleaks is something that I've only recently started to get the hang of, so I wanted to double check first. :-)

I should have updated this issue, but I resolved the main test_asyncio failure that I saw from GH-19149 in GH-19282. Either way though, I think this could still be fixed (even if it would rarely be an issue in most situations).