{
  inputs.nixpkgs.url = "nixpkgs";
  inputs.flake-utils.url = "github:numtide/flake-utils";
  inputs.fenix = {
    url = "github:nix-community/fenix";
    inputs.nixpkgs.follows = "nixpkgs";
  };

  outputs = { self, nixpkgs, flake-utils, fenix }:
    flake-utils.lib.eachDefaultSystem (system:
      let
        pkgs = nixpkgs.legacyPackages.${system};
        fenix' = fenix.packages.${system};
        nightly = fenix'.default;
        stable = fenix'.stable;
      in {
        devShells.default = pkgs.mkShell {
          packages = [ (fenix'.combine [
            (stable.withComponents [
              "cargo" "rustc" "rust-src" "rust-analyzer" "clippy"
            ])
            nightly.rustfmt
          ]) pkgs.cargo-watch ];
        };
      });
}