Start a nix shell with Elixir 1.10.0-rc.0

shell.nix

{ pkgs ? import <nixpkgs> {} }:

with pkgs;

let
  inherit (lib) optional optionals;

  erlang_wx = erlangR21.override {
    wxSupport = true;
  };

  elixir = (beam.packagesWith erlang_wx).elixir.override {
    version = "1.10.0-rc.0";
    rev = "105770cfa0ac0591c1fecca17f2221e0ac6af051";
    sha256 = "1w90b7li43ks8bjgdxiw7mgvg4zly16va4harz7ijjlq1rk2426b";
  };
in

mkShell {
  buildInputs = [ elixir git wxmac ]
    ++ optional stdenv.isLinux inotify-tools # For file_system on Linux.
    ++ optionals stdenv.isDarwin (with darwin.apple_sdk.frameworks; [
      # For file_system on macOS.
      CoreFoundation
      CoreServices
    ]);
}