Hello. Every editor I try to get working with Haskell and stack, eventually tells me I need ghc-mod, which seems to be outdated and unsupported for more recent version of ghc. I’m not a fan of using old versions, but I relented and attempted to install lts-9 and get this error:
stack --resolver lts-9 install ghc-mod Selected resolver: lts-9.21 error: attribute 'ghc802' missing, at (string):1:43 (use '--show-trace' to show detailed location information)
I have been unable to find a path forward, as all of my installed packages are too new and the older versions simply do not show up when I query for them using nix-env. I had set all of this up on an older install at work, perhaps on 18.03. Do I need to run older NixOS to get this working?