{
  description = "Build a cargo project with a custom toolchain";

  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
    flake-utils.url = "github:numtide/flake-utils";

    crane = {
      url = "github:ipetkov/crane";
      inputs = {
        inputs.nixpkgs.follows = "nixpkgs";
        flake-utils.follows = "flake-utils";
      };
    };

    rust-overlay = {
      url = "github:oxalica/rust-overlay";
      inputs = {
        nixpkgs.follows = "nixpkgs";
        flake-utils.follows = "flake-utils";
      };
    };
  };

  outputs = {
    self,
    nixpkgs,
    crane,
    flake-utils,
    rust-overlay,
    ...
  }:
    flake-utils.lib.eachDefaultSystem (system: let
      pkgs = import nixpkgs {
        inherit system;
        overlays = [(import rust-overlay)];
      };

      craneLib = (crane.mkLib pkgs).overrideToolchain (pkgs.rust-bin.selectLatestNightlyWith (toolchain: toolchain.default)); # TODO select toolchain

      craneBuild = craneLib.buildPackage {
        src = craneLib.cleanCargoSource ./.;

        doCheck = true;
      };
      appName = ""; # TODO fill
    in {
      packages.default = craneBuild;

      app.default = {
        type = "app";
        program = "${self.packages.${system}.default}/bin/${appName}";
      };
    });
}
# vim: ts=2