error while building on ghc 8.4.2

[DanielCollins]

https://gist.githubusercontent.com/DanielCollins/7ec09db73295cd4a24aa9a6ab07040b9/raw/e8fa80ade7f359e1fd029ec13de4be68930bb934/gistfile1.txt

works if i switch to 8.2.2.

[jonpetterbergman]

I have a branch which builds with GHC 8.4.3:

https://github.com/jonpetterbergman/digestive-functors/tree/ghc-8.4.3

The issue is that Semigroup became a superclass of Monoid in base 4.11.0.0.

Data.Semigroup was first included in base 4.9, so I bumped the lower bound on base.

In order to support older versions of base you could use an alternative dependency on the semigroup package for base versions <4.9.

[saurabhnanda]

Bumped into this issue while upgrading our project to latest stack LTS. Has this branch already been merged into master? Is master stable enough to use directly as a dependency from github?

[jonpetterbergman]

It has not been merged. There are also two pull requests regarding the same issue.

[saurabhnanda]

I have raised a PR that builds against Stack LTS 12.1 Please have a look.

[jaspervdj]

I merged the PR and will do releases/fixes on monday. Apologies for the delay.