vector and GeneralizedNewtypeDeriving

John Lato jwlato at
Thu May 15 04:17:59 UTC 2014

Hi Richard,

Following your comment, I created a new ticket,, for this issue.

I'm not entirely sure I follow all the subtleties of your analysis, but I
think it's correct.

On Wed, May 14, 2014 at 9:10 PM, Bryan O'Sullivan <bos at>wrote:

> On Wed, May 14, 2014 at 7:02 PM, John Lato <jwlato at> wrote:
>> I would have expected this would have affected a lot users, but as I
>> haven't heard many complaints (and nobody else said anything here!) maybe
>> the impact is smaller than I thought.
> I think people just haven't migrated much to 7.8 yet. This is definitely a
> substantial problem.
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