use fenix

flake.nix

@@ -10,9 +10,13 @@
       url = "github:nix-community/home-manager";
       inputs.nixpkgs.follows = "nixpkgs";
     };
+    fenix = {
+      url = "github:nix-community/fenix";
+      inputs.nixpkgs.follows = "nixpkgs-unstable";
+    };
   };
   outputs = { self, nixpkgs, home-manager, supercolor, i3layouts-rofi, kaokao
-    , mozilla, nixpkgs-unstable }@inputs:
+    , mozilla, nixpkgs-unstable, fenix }@inputs:
     let
       system = "x86_64-linux";
       overlay-unstable = final: prev: {
@@ -22,11 +26,13 @@
         };
       };
     in {
+      packages.x86_64-linux.default =
+        fenix.packages.x86_64-linux.minimal.toolchain;
       nixosConfigurations.bat = nixpkgs.lib.nixosSystem {
         inherit system;
         modules = [
           ({ config, pkgs, ... }: {
-            nixpkgs.overlays = [ mozilla.overlays.rust overlay-unstable ];
+            nixpkgs.overlays = [ fenix.overlays.default overlay-unstable ];
           })
           ./configuration.nix
         ];

user.nix

@@ -1,9 +1,5 @@
 { pkgs, supercolor, nixpkgs-unstable, kaokao, i3layouts-rofi, ... }:
-let
-  my-python-packages = p: with p; [ pytest i3ipc python-lsp-server ];
-  rust = pkgs.latest.rustChannels.stable.rust.override {
-    extensions = [ "rust-src" ];
-  };
+let my-python-packages = p: with p; [ pytest i3ipc python-lsp-server ];
 in {
   # Define a user account. Don't forget to set a password with ‘passwd’.
   users.users.zoe = {
@@ -156,7 +152,14 @@ in {
       nodePackages_latest.svelte-language-server
       nodePackages_latest.svelte-check
       ## rust
-      rust
+      (fenix.stable.withComponents [
+        "cargo"
+        "clippy"
+        "rust-src"
+        "rustc"
+        "rustfmt"
+      ])
+      rust-analyzer-nightly
       cargo-watch
       llvmPackages_rocm.clang
       llvmPackages_rocm.llvm