Re: vector and GeneralizedNewtypeDeriving

Hi Richard, Following your comment, I created a new ticket, https://ghc.haskell.org/trac/ghc/ticket/9112, 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 wrote:

On Wed, May 14, 2014 at 7:02 PM, John Lato 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.