Constraint Alex to be new enough to support the revised primops
@bgamari however the trickiness here is that ghc-head pre and post ghc!4492 (closed) is both 9.1.x, so no version of alex can distinguish the two.
Due to a large amount of spam we do not allow new users to create repositories, they are "external" users. If you are a new user and want to create a repository, for example for forking GHC, open a new issue on ghc/ghc using the "get-verified" issue template
@bgamari however the trickiness here is that ghc-head pre and post ghc!4492 (closed) is both 9.1.x, so no version of alex can distinguish the two.