Add rust devshell

.gitignore

@@ -2,3 +2,4 @@
 *.pro.user*
 .idea/
 .direnv/
+**/target

flake.lock

@@ -18,7 +18,28 @@
     },
     "root": {
       "inputs": {
-        "nixpkgs": "nixpkgs"
+        "nixpkgs": "nixpkgs",
+        "rust-overlay": "rust-overlay"
+      }
+    },
+    "rust-overlay": {
+      "inputs": {
+        "nixpkgs": [
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1759544920,
+        "narHash": "sha256-yQwP0JOHi3Icq09GG5ufGuGrq2zIijglVFj3kkF2MHA=",
+        "owner": "oxalica",
+        "repo": "rust-overlay",
+        "rev": "bd3a63bbff2c4cb3cd48e9d49f54c2ccad457f70",
+        "type": "github"
+      },
+      "original": {
+        "owner": "oxalica",
+        "repo": "rust-overlay",
+        "type": "github"
       }
     }
   },

flake.nix

@@ -1,29 +1,45 @@
 {
-  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixos-25.05";
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-25.05";
+
+    rust-overlay = {
+      url = "github:oxalica/rust-overlay";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
+  };
 
   outputs =
-    { self, nixpkgs }:
+    { nixpkgs, rust-overlay, ... }:
     let
       system = "x86_64-linux";
       pkgs = nixpkgs.legacyPackages.${system};
     in
     {
       devShells.${system} = {
-        cpp =
+        cpp = pkgs.mkShell.override { stdenv = pkgs.clangStdenv; } {
-          pkgs.mkShell.override
+          packages = with pkgs; [
-            {
+            gdb
-              stdenv = pkgs.clangStdenv;
+            clang-tools
-            }
+            qt6.full
-            {
+          ];
-              packages = with pkgs; [
+        };
-                gdb
+
-                clang-tools
+        go = pkgs.mkShellNoCC {
-                qt6.full
-              ];
-            };
-        go = pkgs.mkShell {
           packages = with pkgs; [ go ];
         };
+
+        rust =
+          let
+            pkgs = import nixpkgs {
+              inherit system;
+              overlays = [ rust-overlay.overlays.default ];
+            };
+            rust-toolchain = pkgs.rust-bin.stable.latest.default.override { extensions = [ "rust-src" ]; };
+          in
+          pkgs.mkShellNoCC {
+            packages = [ rust-toolchain ];
+            RUST_SRC_PATH = "${rust-toolchain}/lib/rustlib/src/rust/library";
+          };
       };
 
       formatter.${system} = pkgs.nixfmt-tree;