gistfile1.txt

let
  overlay = self: super: {
    haskellPackages = with self.haskell.lib; super.haskellPackages.extend (selfHS: superHS: {
      purescript = selfHS.callHackage "purescript" "0.12.0" {};
    });
  };
in
  { nixpkgs ? builtins.fetchTarball {
      url = https://releases.nixos.org/nixos/18.03/nixos-18.03.133157.fde20125199/nixexprs.tar.xz;
      sha256 = "06rj0v16nk8f75k426h70zwn5g7cscvkb7w83zdsnipc55a7nnmd";
    }
  , pkgs ? import nixpkgs { overlays = [ overlay ]; }
  }:

  pkgs.haskellPackages.purescript