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

  outputs = inputs @ { self, nixpkgs, fenix }: let
      eachSystem = nixpkgs.lib.genAttrs [
        "aarch64-linux"
        "x86_64-linux"
      ];
    in {
      devShells = eachSystem (system:
        let
          pkgs = nixpkgs.legacyPackages.${system};
          fenixPkgs = fenix.packages.${system};
          toolchain = fenixPkgs.fromToolchainFile {
            file = ./rust-toolchain.toml;
            sha256 = "sha256-R0F0Risbr74xg9mEYydyebx/z0Wu6HI0/KWwrV30vZo=";
          };
        in {
          default = pkgs.mkShell {
            packages = [ toolchain fenixPkgs.rust-analyzer ];
          };
        });
    };
}