[pypy-issue] [issue1355] Difference from CPython when extending a list with an iterable that depends on that list.

[Mark Dickinson]

Mark Dickinson <dickinsm at gmail.com> added the comment:

> This occurs because CPython does the equivilant of `list`

Did you mean this the other way around?  It looks to me as though CPython is being 
lazier than PyPy.

> It's not obvious to me why CPython's behavior is more correct.

Agreed that it's not obvious; it might be worth bringing up on the python-dev 
mailing list.

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