Bug report

Bug description:

./python -c 'import sys; import itertools; print(itertools.count(sys.maxsize))'
count(<NULL>)

This aborts on DEBUG builds. See #126595 (comment).

I'd like to address this issue separately since the free-threaded code would be different.

CPython versions tested on:

CPython main branch

Operating systems tested on:

No response

Linked PRs

• gh-126618: Fix representation of itertools.count(sys.maxsize) #126620
• gh-126618: fix repr(itertools.count(sys.maxsize)) #127048
• [3.13] gh-126618: fix repr(itertools.count(sys.maxsize)) (GH-127048) #127508
• [3.12] gh-126618: fix repr(itertools.count(sys.maxsize)) (GH-127048) #127510