{
  inputs = {
    naersk.url = "github:nix-community/naersk/master";
    nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
    utils.url = "github:numtide/flake-utils";
    rust-overlay = "github:oxalica/rust-overlay";
  };

  outputs = { self, nixpkgs, utils, naersk, rust-overlay }:
    utils.lib.eachDefaultSystem (system:
      let
        overlays = [ rust-overlay.overlays.default ];
        pkgs = import nixpkgs { inherit system overlays; };
        naersk-lib = pkgs.callPackage naersk { };
      in
      {
        defaultPackage = naersk-lib.buildPackage ./.;
        devShell = with pkgs; mkShell {
          buildInputs = [
            (pkgs.rust-bin.selectLatestNightlyWith
              (
                toolchain:
                toolchain.default.override {
                  extensions = [ "rust-src" ];
                }
              ))
            pkgs.rust-analyzer
          ];
          RUST_SRC_PATH = rustPlatform.rustLibSrc;
          shellHook = ''
            # nix flake update # is this even needed?
          '';
        };
      });
}