{
  description = "Advent Of Code 2023";

  inputs = {
    nixpkgs.url = "nixpkgs/nixos-unstable";
  };

  outputs = { self, nixpkgs }:
    let

      forAllSystems = function:
        nixpkgs.lib.genAttrs [
          "x86_64-linux"
          "aarch64-darwin"
        ] (system: function nixpkgs.legacyPackages.${system});

    in
      {

        devShells = forAllSystems (pkgs: with pkgs; {
          default = mkShell {
            nativeBuildInputs = [ rustc cargo ];
            buildInputs = [ hyperfine ];
            RUST_SRC_PATH = "${rustPlatform.rustLibSrc}";
          };
        });

      };
}