{
  description = "A basic flake with a shell";
  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
  inputs.fenix = {
    url = "github:nix-community/fenix";
    inputs.nixpkgs.follows = "nixpkgs";
    inputs.rust-analyzer-src.follows = "";
  };
  inputs.flake-utils.url = "github:numtide/flake-utils";
  inputs.crane.url = "github:ipetkov/crane";
  inputs.cargo-aoc.url = "github:traxys/aoc-tool";

  outputs =
    {
      self,
      nixpkgs,
      flake-utils,
      crane,
      fenix,
      cargo-aoc,
    }:
    flake-utils.lib.eachDefaultSystem (
      system:
      let
        pkgs = import nixpkgs {
          inherit system;
          overlays = [ fenix.overlays.default ];
        };
        rust = pkgs.fenix.stable.defaultToolchain;
        craneLib = crane.mkLib pkgs;
      in
      {
        devShell = pkgs.mkShell {
          nativeBuildInputs = [
            rust
            cargo-aoc.defaultPackage.${system}
          ]
          ++ (with pkgs; [
            hyperfine
            cargo-flamegraph
            cargo-show-asm
          ]);
          RUST_PATH = "${rust}";
          RUST_DOC_PATH = "${rust}/share/doc/rust/html/std/index.html";
          AOC_YEAR = "2025";
        };

        defaultPackage = craneLib.buildPackage {
          src = craneLib.cleanCargoSource ./.;
        };
      }
    );
}