shell.nix


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{ compiler ? "default"
, nixpkgs ? import <nixpkgs> {}
}: let

  inherit (nixpkgs) lib pkgs;

  haskellPackages =
    if compiler == "default" then
      pkgs.haskellPackages
    else
      pkgs.haskell.packages.${compiler};

  drv = haskellPackages.callPackage (import ./.) {};

in

  lib.overrideDerivation drv.env (oldAttrs: {
    buildInputs = [
      pkgs.cabal-install
    ];
  })