dangling references in case of a Py_Initialize/Py_Finalize
cycle.

arena's "private" list of objects, so there might
be two references to that list.

objects before initializing it. It might be linked
already if there was a Py_Initialize/Py_Finalize
cycle earlier; not unlinking it would break the global
list.

Backported to 2.4.

is a macro.

look dead right at the start.  Use Py_CLEAR for four more
frame members.

Py_VISIT:  cast the `op` argument to PyObject* when calling
`visit()`.  Else the caller has to pay too much attention to
this silly detail (e.g., frame_traverse needs to traverse
`struct _frame *` and `PyCodeObject *` pointers too).

why it's important.  Now there are ;-)

If someone else hasn't already, I'll add a Py_CLEAR cleanup
task to the TODO Wiki next.

examples no longer require any explicit closing to avoid
leaking.

That the tee-based examples still do is (I think) still a
mystery.  Part of the mystery is that gc.garbage remains
empty:  if it were the case that some generator in a trash
cycle said it needed finalization, suppressing collection
of that cycle, that generator _would_ show up in gc.garbage.

So this is acting more like, e.g., some tp_traverse slot
isn't visiting all the pointers it should (in which case
the skipped pointer(s) would act like an external root,
silently suppressing collection of everything reachable
from it(them)).

problems: first, PyGen_NeedsFinalizing() had an off-by-one bug that
prevented it from ever saying a generator didn't need finalizing, and
second, frame objects cleared themselves in a way that caused their
owning generator to think they were still executable, causing a double
deallocation of objects on the value stack if there was still a loop
on the block stack.  This revision also removes some unnecessary
close() operations from test_generators that are now appropriately
handled by the cycle collector.

PySequence_GetItem of the time.strptime() result. Not a high probability
bug, but not inconceivable either, considering people can provide their own
'time' module.

an incremental encoder that must retain part of the data between calls
to the encode() method.

Fix the incremental encoder and decoder for the IDNA encoding.

This closes SF patch #1453235.

and PyObject_DEL.

independently. Fixes #1355883.

uncommon but possible.  Inspired by SF bug 1469629.

incremental codec tests.

PyObject_CallMethod aware of PY_SSIZE_T_CLEAN.

The test case came from test_generators, not test_itertools.
Ensure there's no cyclic garbage we are counting.

This is weird because it leaks, then reaches a limit:

python.exe -i test_tee.py
>>> leak()
0
[26633 refs]
>>> leak()
0
[26658 refs]
>>> leak()
0
[26683 refs]
>>> leak()
0
[26708 refs]
>>> leak()
0
[26708 refs]
>>> leak()
0
[26708 refs]
>>> leak()
0

passing a string.  Martin already fixed the actual crash by ensuring
Py_UNICODE is unsigned.  As discussed on python-dev, this fix
removes the possibility of creating a unicode string from a raw buffer.

There is an outstanding question of how to fix the crash in 2.4.