gistfile1.txt

> nix-shell --arg compiler \"ghc8101\"
error: --- TypeError -------------------------------------------------------------------- nix-shell
in file: /nix/store/3kx03cm9kr9dxgk4w7i9pi6f67wff4iq-source/pkgs/development/haskell-modules/make-package-set.nix (246:49)

attempt to call something which is not a function but a list
(use '--show-trace' to show detailed location information)

>  nix-shell --arg compiler ghc8101
error: --- UndefinedVarError ------------------------------------------------------------ nix-shell
in file: (string) (1:1)

undefined variable 'ghc8101'

Nix.repl

> sources = import nix/sources.nix
> pkgs = import sources.nixpkgs {}
> pkgs.haskell.packages.
pkgs.haskell.packages.ghc8101         pkgs.haskell.packages.ghc865          pkgs.haskell.packages.ghc883          pkgs.haskell.packages.ghcjs86
pkgs.haskell.packages.ghc822Binary    pkgs.haskell.packages.ghc865Binary    pkgs.haskell.packages.ghcHEAD         pkgs.haskell.packages.integer-simple
pkgs.haskell.packages.ghc844          pkgs.haskell.packages.ghc882          pkgs.haskell.packages.ghcjs

shell.nix

{ sources ? import nix/sources.nix,
  nixpkgs ? import sources.nixpkgs {},
  compiler ? "default"
 }:
with nixpkgs;

let defaultCompiler = "ghc" + lib.replaceStrings ["."] [""] haskellPackages.ghc.version;
    haskellPackagesForProject = p:
        if compiler == "default" || compiler == defaultCompiler
            then haskellPackages.ghcWithPackages p
            # for all other compilers there is no Nix cache so dont bother building deps with NIx
            else haskell.packages.${compiler}.ghcWithPackages [];

   compilerWithPackages = haskellPackagesForProject(p:
        with p;
        [
         ]);
in
stdenv.mkDerivation {
  name = "haskell-language-server";
  buildInputs = [
    gmp
    zlib
    ncurses

    haskellPackages.cabal-install
    haskellPackages.hlint

    compilerWithPackages

  ];
  src = null;
  shellHook = ''
    export LD_LIBRARY_PATH=${gmp}/lib:${zlib}/lib:${ncurses}/lib
    export PATH=$PATH:$HOME/.local/bin
  '';
}