darkproger's example

darkproger-s_example.txt

[guest@nixvm:~/haskell]$ cat default.nix 
{ haskellPackages ? (import <nixpkgs> {}).haskellPackages }:
let
  inherit (haskellPackages) cabal cabalInstall mtl transformers;

in cabal.mkDerivation (self: {
  pname = "test";
  version = "0.1.0.0";
  isExecutable = true;
  src = ./.;
  buildDepends = [
    mtl transformers
  ];
  buildTools = [ cabalInstall ];
})

[guest@nixvm:~/haskell]$ cabal --version
The program ‘cabal’ is currently not installed. You can install it by typing:
  nix-env -i cabal-install

[guest@nixvm:~/haskell]$ nix-shell
warning: you did not specify `--add-root'; the result might be removed by the garbage collector

[nix-shell:~/haskell]$ cabal --version
cabal-install version 1.16.0.2
using version 1.16.0 of the Cabal library