Remove custom lib usage

modules/dev/rust.nix

@@ -1,14 +1,15 @@
 { config, lib, pkgs, ... }:
 
-with lib;
-with lib.my;
 let cfg = config.modules.dev.rust;
 in {
   options.modules.dev.rust = {
-    enable = mkBoolOpt false;
+    enable = lib.mkOption {
+      default = false;
+      example = true;
+    };
   };
 
-  config = mkIf cfg.enable {
+  config = lib.mkIf cfg.enable {
     user.packages = with pkgs; [
       rustc
       rustup
@@ -16,4 +17,4 @@ in {
       rust-bindgen
     ];
   };
-}
+}