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The following code will sometimes warn about an ignored TypeError('catching classes that do not inherit from BaseException is not allowed',) on termination:
class MyException(Exception):
 pass
def gen():
 try:
 yield
 except MyException:
 pass
g = gen()
next(g)
Of course, MyException inherits from Exception, so there should be no problem.
Apparently, MyException gets destroyed before the generator object (at least sometimes, presumably depending on the hash randomization seed), and the destructor of the generator object then complains because there is no MyException any more. At least that's my explanation of this, without having digged into the code.

s/digged/dug/ :-)

You are almost certainly correct. MyException can get set to None during interpreter shutdown. There are a couple of active issues and a PEP that address this type of problem, so this issue probably isn't needed, but I'll leave that up to Antoine, who is working on it.

I will keep this issue alive so that I can check whether it is fixed by further changes.

While this is easy to reproduce under 3.3, it doesn't happen anymore under 3.4. Given how tricky it would be to fix it under 3.3 (IMO), I prefer to close the bug.