nixos-config/template/rust/flake.nix

{
  inputs = {
    crane.url = "github:ipetkov/crane";
    flake-utils.url = "github:numtide/flake-utils";
    fenix.url = "github:nix-community/fenix";
    nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
  };

  outputs = {
    self,
    crane,
    fenix,
    flake-utils,
    nixpkgs,
  }:
    flake-utils.lib.eachDefaultSystem (system: let
      pkgs = nixpkgs.legacyPackages.${system};
      fenixPkgs = fenix.packages.${system};
      craneLib = crane.mkLib pkgs;
    in {
      devShells.default = craneLib.devShell {
        packages = [
          fenixPkgs.rust-analyzer
        ];
        RUST_SRC_PATH = "${fenixPkgs.complete.rust-src}/lib/rustlib/src/rust/library";
      };
    });
}