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From: Terry Reedy <tjreedy@udel.edu>
Subject: Re: Infinitely nested containers
Date: Sat, 22 Nov 2014 16:57:42 -0500
References: <931d12c0-12b3-4278-a9b9-1e2c32f138b3@googlegroups.com> <87bno16nsw.fsf@elektro.pacujo.net> <1416591555.652129.193873581.54A97BD7@webmail.messagingengine.com> <CALwzidny+MbAZ-fnhZJ4C2zhEvFtkzPjVJdmzPs+KTbXG5JCHQ@mail.gmail.com> <CAKJDb-MHMXj7nHKND2K_WdkRH7CXs0fgRwKyMeZLPpkNnk-M0g@mail.gmail.com>
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On 11/21/2014 2:30 PM, Zachary Ware wrote:
> On Fri, Nov 21, 2014 at 12:37 PM, Ian Kelly <ian.g.kelly@gmail.com> wrote:
>> Here's a nice crash. I thought this might similarly produce a
>> recursion depth error, but no, it's a seg fault!
>>
>> $ cat test.py
>> import itertools
>>
>> l = []
>> it = itertools.chain.from_iterable(l)
>> l.append(it)
>> next(it)
>> $ python3 test.py
>> Segmentation fault (core dumped)
>
> Would you mind submitting a bug report for that?  Any segfault
> produced by pure Python code must be fixed.

This is too important to lose.
http://bugs.python.org/issue22920


-- 
Terry Jan Reedy