Mark Dickinson <dicki...@gmail.com> added the comment:

There's a suspicious looking test in list_ass_subscript in Objects/listobject.c:

if (cur + step >= Py_SIZE(self)) {
        lim = Py_SIZE(self) - cur - 1;
}

I think what's happening here is that cur + step is overflowing, so that the 
test fails.

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue7788>
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