Having spent a lot of time doing just this today, you can use this incantation: stack init --resolver ghc-8.0.1 --force Run that from your project's directory. If you have upper bounds, it will complain about them. Once you relax them, it will generate an appropriate stack.yaml (overwriting any existing stack.yaml), at which point you can `stack test`. I've had a lot of success building packages today, it looks like people upgraded preemptively to GHC 8 this time :) On Tue, May 24, 2016 at 11:10 AM, David Turner < dct25-561bs@mythic-beasts.com> wrote:
Hi,
My name appears in the Stackage GHC 8 mega-issue [ https://github.com/fpco/stackage/issues/1476] and I'd like to upgrade my packages. I suspect it's just a case of relaxing the upper bound on base to <4.10 but I'd quite like to check that this does, in fact, work.
However I'm not sure how to go about doing this since there don't yet seem to be any stackage snapshots that use GHC 8. What's the best way to get around this?
Cheers,
David