{
  description = "Parallel sequential iterator for Rust";

  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
    flake-parts.url = "github:hercules-ci/flake-parts";
  };

  outputs =
    inputs@{
      self,
      nixpkgs,
      flake-parts,
      ...
    }:
    flake-parts.lib.mkFlake { inherit inputs; } {
      systems = [
        "x86_64-linux"
        "aarch64-linux"
        "x86_64-darwin"
        "aarch64-darwin"
      ];

      perSystem =
        { pkgs, system, ... }:
        {
          # nix develop
          devShells.default = pkgs.mkShell {
            nativeBuildInputs = with pkgs; [
              rustc
              cargo
              rustfmt
              clippy
              cargo-audit
              cargo-edit
              rust-analyzer
            ];
          };

          # nix fmt
          formatter = pkgs.nixfmt-tree;
        };
    };
}