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Martin, it's easy to transform the example into one that
crashes. For example, adding "print t[3]" as the last line of
the iter() function causes it to die with a segfault on my box.
Virtually anything that fetches a NULL from the tuple will try
to Py_INCREF it (that's all "t[3]" does), and that's an instant
NULL-pointer dereferencing death.
That said, it would be more helpful <wink> if Armin submitted
a doc patch. The introspective features of the gc module are
intended to be used by consenting adults facing hard
debugging problems, and I don't care if they can be tricked
into blowing up. I agree the docs should point out the
possibility, though.