{
  # Shows multiple flake inputs plus a `follows` edge that makes one
  # transitive input reuse a top-level input from this flake.
  description = "A minimal follows and inputs example";

  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";

    systems.url = "github:nix-systems/default";

    flake-utils = {
      url = "github:numtide/flake-utils";
      inputs.systems.follows = "systems";
    };
  };

  outputs =
    {
      self,
      nixpkgs,
      flake-utils,
      ...
    }:
    flake-utils.lib.eachDefaultSystem (
      system:
      let
        pkgs = import nixpkgs { inherit system; };
      in
      {
        packages.default = pkgs.writeShellScriptBin "show-follows" ''
          echo "flake-utils is sharing the top-level systems input"
        '';

        apps.default = {
          type = "app";
          program = "${self.packages.${system}.default}/bin/show-follows";
          meta.description = "Run the package built in the follows example.";
        };

        checks.runs = pkgs.runCommand "show-follows-runs" { } ''
          output="$(${self.packages.${system}.default}/bin/show-follows)"

          if [ "$output" = "flake-utils is sharing the top-level systems input" ]; then
            echo ok > "$out"
          else
            echo "unexpected output: $output" >&2
            exit 1
          fi
        '';
      }
    );
}