Now that I solved the most immediate problem with my new flake.nix using flake parts I’ve bumped into the next one.
The flake.nix is the same as in my previous question. I had hoped it would be enough to get a fully functional devshell, but all the dependencies of the package I’m building are missing.
The package I’m building, and which builds perfectly fine using nix build '.#app', is depending on servant:
❯ rg servant tehst.cabal
17: , servant
18: , servant-server
but it’s missing in the devshell:
> nix develop
warning: Git tree '/home/elrond/Fabled/tehst' is dirty
(ins)$ ghc-pkg list | rg servant | wc -l
0
So, what am I missing, how do I get a devshell with all dependencies of the Haskell package?