{
  description = "A nix-store exploration tool";
  inputs = {
    flake-utils.url = "github:numtide/flake-utils";
    nixpkgs.url = "github:NixOS/nixpkgs/release-20.09";
    rust-overlay.url = "github:oxalica/rust-overlay/master";
    cargo2nix = {
      url = "github:cargo2nix/cargo2nix";
      flake = false;
    };
  };
  outputs = { self, nixpkgs, rust-overlay, flake-utils, cargo2nix }:
    flake-utils.lib.eachDefaultSystem
      (
        system:
          let
            pkgs = import nixpkgs { overlays = [ (import rust-overlay) ]; };
            rustPkgs = pkgs.rustBuilder.makePackageSet' {
              rustChannel = "1.50.0";
              packageFun = import ./Cargo.nix;
            };
          in
            rec {
              packages = flake-utils.lib.flattenTree {
                nix-ray = rustPkgs.workspace.nix-ray;
              };
              defaultPackage = packages.nix-ray;
              apps.hello = flake-utils.lib.mkApp { drv = packages.nix-ray; };
              defaultApp = apps.hello;
              devShell = pkgs.mkShell {
                nativeBuildInputs = [ pkgs.hello ];
              };
            }
      );
}