Antoine Pitrou added the comment:

> I don't like the new END_ITER instruction. This complicates (and slows down) 
> the evaluation loop and the peepholer.

I don't think it slows down anything in the eval loop.  I agree it adds a bit 
of complexity.

> This also adds a limitation on the peepholer (END_ITER can't be optimized 
> out).

It's an unconditional backedge, how could you optimize it?

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<http://bugs.python.org/issue17611>
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