{
  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
    systems.url = "github:nix-systems/default";
    fenix.url = "github:nix-community/fenix";
    fenix.inputs.nixpkgs.follows = "nixpkgs";
  };

  outputs =
    {
      nixpkgs,
      fenix,
      systems,
      ...
    }:
    let
      forEachSystem = nixpkgs.lib.genAttrs (import systems);
    in
    {
      devShells = forEachSystem (
        system:
        let
          pkgs = nixpkgs.legacyPackages.${system};
          toolchain =
            with fenix.packages.${system};
            combine [
              complete.toolchain
            ];
        in
        {
          default = pkgs.mkShell rec {
            buildInputs = with pkgs; [
              cargo-watch
              toolchain
            ];
            LD_LIBRARY_PATH = pkgs.lib.makeLibraryPath buildInputs;
          };
        }
      );
    };
}