let sources = { haskellNix = builtins.fetchTarball "https://github.com/input-output-hk/haskell.nix/archive/refs/tags/0.0.117.tar.gz"; }; haskellNix = import sources.haskellNix {}; pkgs = import # https://input-output-hk.github.io/haskell.nix/reference/supported-ghc-versions.html haskellNix.sources.nixpkgs-unstable haskellNix.nixpkgsArgs; in pkgs.haskell-nix.project { src = pkgs.haskell-nix.haskellLib.cleanGit { name = "haskell-nix-project"; src = ../.; }; compiler-nix-name = "ghc8107"; }