See https://github.com/haskell/containers/issues/195 There's been some change to representation types. However, Andres Löh believes that the correct solution is to remove the Generic instances that were recently added to containers master (which have never appeared in a released version). I've opened a pull request to do so, but I'd prefer to hear from Wren Romano (co-maintainer) and Kubo Kováč (who wrote the instances) before doing so. On Thu, Apr 21, 2016 at 3:56 PM, José Pedro Magalhães wrote:

Hi David,

Care to share exactly what breaks? What errors do you get?

Cheers, Pedro

On Thu, Apr 21, 2016 at 3:11 AM, David Feuer wrote:

...

containers does not currently build with GHC 8 because of changes to Generics. I only have a shallow understanding of GHC.Generics. Could someone give me a hand figuring out what I need to change?

Thanks, David Feuer

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