Use unstable rust-analyzer

Fixes proc-macro version mismatch

config.nix

@@ -1,4 +1,4 @@
-{ pkgs, inputs, ... }:
+{ pkgs, pkgs-unstable, inputs, ... }:
 {
   colorschemes.tokyonight.enable = true;
 
@@ -150,7 +150,15 @@
     comment.enable = true;
     sleuth.enable = true;
 
-    rustaceanvim.enable = true;
+    rustaceanvim = {
+      enable = true;
+      settings = {
+        server = {
+          cmd = [ "${pkgs-unstable.rust-analyzer}/bin/rust-analyzer" ];
+        };
+      };
+    };
+
 
     mkdnflow = {
       enable = true;

flake.nix

@@ -1,6 +1,7 @@
 {
   inputs = {
     nixpkgs.url = "github:NixOS/nixpkgs/nixos-25.05";
+    nixpkgs-unstable.url = "github:NixOS/nixpkgs/nixos-unstable";
 
     flake-utils.url = "github:numtide/flake-utils";
 
@@ -20,13 +21,17 @@
     };
   };
 
-  outputs = { self, nixpkgs, flake-utils, nixvim, ... }@inputs:
+  outputs = { self, nixpkgs, nixpkgs-unstable, flake-utils, nixvim, ... }@inputs:
     flake-utils.lib.eachDefaultSystem (system:
       let
         pkgs = import nixpkgs {
           inherit system;
         };
 
+        pkgs-unstable = import nixpkgs-unstable {
+          inherit system;
+        };
+
         nixvimLib = nixvim.lib.${system};
 
         nixvimModule = import ./config.nix;
@@ -34,7 +39,7 @@
         nvim = nixvim.legacyPackages.${system}.makeNixvimWithModule {
           module = nixvimModule;
           extraSpecialArgs = {
-            inherit inputs;
+            inherit inputs pkgs-unstable;
           };
         };
       in